:root {
  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;

  /* Background color tokens (Light Mode) */
  --color-bg-1: rgba(59, 130, 246, 0.08); /* Light blue */
  --color-bg-2: rgba(245, 158, 11, 0.08); /* Light yellow */
  --color-bg-3: rgba(34, 197, 94, 0.08); /* Light green */
  --color-bg-4: rgba(239, 68, 68, 0.08); /* Light red */
  --color-bg-5: rgba(147, 51, 234, 0.08); /* Light purple */
  --color-bg-6: rgba(249, 115, 22, 0.08); /* Light orange */
  --color-bg-7: rgba(236, 72, 153, 0.08); /* Light pink */
  --color-bg-8: rgba(6, 182, 212, 0.08); /* Light cyan */

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
  --color-select-caret: rgba(var(--color-slate-900-rgb), 0.8);

  /* Common style patterns */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for opacity control */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04),
    0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04),
    0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    /* RGB versions for opacity control (Dark Mode) */
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;

    /* Background color tokens (Dark Mode) */
    --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
    --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
    --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
    --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
    --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
    --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
    --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
    --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
    
    /* Semantic Color Tokens (Dark Mode) */
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
      inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --button-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

    /* Common style patterns - updated for dark mode */
    --focus-ring: 0 0 0 3px var(--color-focus-ring);
    --focus-outline: 2px solid var(--color-primary);
    --status-bg-opacity: 0.15;
    --status-border-opacity: 0.25;
    --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

    /* RGB versions for dark mode */
    --color-success-rgb: var(--color-teal-300-rgb);
    --color-error-rgb: var(--color-red-400-rgb);
    --color-warning-rgb: var(--color-orange-400-rgb);
    --color-info-rgb: var(--color-gray-300-rgb);
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  /* RGB versions for opacity control (dark mode) */
  --color-gray-400-rgb: 119, 124, 124;
  --color-teal-300-rgb: 50, 184, 198;
  --color-gray-300-rgb: 167, 169, 169;
  --color-gray-200-rgb: 245, 245, 245;

  /* Colorful background palette - Dark Mode */
  --color-bg-1: rgba(29, 78, 216, 0.15); /* Dark blue */
  --color-bg-2: rgba(180, 83, 9, 0.15); /* Dark yellow */
  --color-bg-3: rgba(21, 128, 61, 0.15); /* Dark green */
  --color-bg-4: rgba(185, 28, 28, 0.15); /* Dark red */
  --color-bg-5: rgba(107, 33, 168, 0.15); /* Dark purple */
  --color-bg-6: rgba(194, 65, 12, 0.15); /* Dark orange */
  --color-bg-7: rgba(190, 24, 93, 0.15); /* Dark pink */
  --color-bg-8: rgba(8, 145, 178, 0.15); /* Dark cyan */
  
  /* Semantic Color Tokens (Dark Mode) */
  --color-background: var(--color-charcoal-700);
  --color-surface: var(--color-charcoal-800);
  --color-text: var(--color-gray-200);
  --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
  --color-primary: var(--color-teal-300);
  --color-primary-hover: var(--color-teal-400);
  --color-primary-active: var(--color-teal-800);
  --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
  --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
  --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
  --color-border: rgba(var(--color-gray-400-rgb), 0.3);
  --color-error: var(--color-red-400);
  --color-success: var(--color-teal-300);
  --color-warning: var(--color-orange-400);
  --color-info: var(--color-gray-300);
  --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
  --color-btn-primary-text: var(--color-slate-900);
  --color-card-border: rgba(var(--color-gray-400-rgb), 0.15);
  --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
  --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

  /* Common style patterns - updated for dark mode */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for dark mode */
  --color-success-rgb: var(--color-teal-300-rgb);
  --color-error-rgb: var(--color-red-400-rgb);
  --color-warning-rgb: var(--color-orange-400-rgb);
  --color-info-rgb: var(--color-gray-300-rgb);
}

[data-color-scheme="light"] {
  /* RGB versions for opacity control (light mode) */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  
  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);

  /* RGB versions for light mode */
  --color-success-rgb: var(--color-teal-500-rgb);
  --color-error-rgb: var(--color-red-500-rgb);
  --color-warning-rgb: var(--color-orange-500-rgb);
  --color-info-rgb: var(--color-slate-500-rgb);
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 {
  font-size: var(--font-size-4xl);
}
h2 {
  font-size: var(--font-size-3xl);
}
h3 {
  font-size: var(--font-size-2xl);
}
h4 {
  font-size: var(--font-size-xl);
}
h5 {
  font-size: var(--font-size-lg);
}
h6 {
  font-size: var(--font-size-md);
}

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

code,
pre {
  font-family: var(--font-family-mono);
  font-size: calc(var(--font-size-base) * 0.95);
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

code {
  padding: var(--space-1) var(--space-4);
}

pre {
  padding: var(--space-16);
  margin: var(--space-16) 0;
  overflow: auto;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-base);
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--primary:active {
  background: var(--color-primary-active);
}

.btn--secondary {
  background: var(--color-secondary);
  color: var(--color-text);
}

.btn--secondary:hover {
  background: var(--color-secondary-hover);
}

.btn--secondary:active {
  background: var(--color-secondary-active);
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--outline:hover {
  background: var(--color-secondary);
}

.btn--sm {
  padding: var(--space-4) var(--space-12);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-sm);
}

.btn--lg {
  padding: var(--space-10) var(--space-20);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-md);
}

.btn--full-width {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Form elements */
.form-control {
  display: block;
  width: 100%;
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-base);
  transition: border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

textarea.form-control {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
}

select.form-control {
  padding: var(--space-8) var(--space-12);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background-image: var(--select-caret-light);
  background-repeat: no-repeat;
  background-position: right var(--space-12) center;
  background-size: 16px;
  padding-right: var(--space-32);
}

/* Add a dark mode specific caret */
@media (prefers-color-scheme: dark) {
  select.form-control {
    background-image: var(--select-caret-dark);
  }
}

/* Also handle data-color-scheme */
[data-color-scheme="dark"] select.form-control {
  background-image: var(--select-caret-dark);
}

[data-color-scheme="light"] select.form-control {
  background-image: var(--select-caret-light);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: var(--focus-outline);
}

.form-label {
  display: block;
  margin-bottom: var(--space-8);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.form-group {
  margin-bottom: var(--space-16);
}

/* Card component */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-standard);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__body {
  padding: var(--space-16);
}

.card__header,
.card__footer {
  padding: var(--space-16);
  border-bottom: 1px solid var(--color-card-border-inner);
}

/* Status indicators - simplified with CSS variables */
.status {
  display: inline-flex;
  align-items: center;
  padding: var(--space-6) var(--space-12);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.status--success {
  background-color: rgba(
    var(--color-success-rgb, 33, 128, 141),
    var(--status-bg-opacity)
  );
  color: var(--color-success);
  border: 1px solid
    rgba(var(--color-success-rgb, 33, 128, 141), var(--status-border-opacity));
}

.status--error {
  background-color: rgba(
    var(--color-error-rgb, 192, 21, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-error);
  border: 1px solid
    rgba(var(--color-error-rgb, 192, 21, 47), var(--status-border-opacity));
}

.status--warning {
  background-color: rgba(
    var(--color-warning-rgb, 168, 75, 47),
    var(--status-bg-opacity)
  );
  color: var(--color-warning);
  border: 1px solid
    rgba(var(--color-warning-rgb, 168, 75, 47), var(--status-border-opacity));
}

.status--info {
  background-color: rgba(
    var(--color-info-rgb, 98, 108, 113),
    var(--status-bg-opacity)
  );
  color: var(--color-info);
  border: 1px solid
    rgba(var(--color-info-rgb, 98, 108, 113), var(--status-border-opacity));
}

/* Container layout */
.container {
  width: 100%;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-16);
  padding-left: var(--space-16);
}

@media (min-width: 640px) {
  .container {
    max-width: var(--container-sm);
  }
}
@media (min-width: 768px) {
  .container {
    max-width: var(--container-md);
  }
}
@media (min-width: 1024px) {
  .container {
    max-width: var(--container-lg);
  }
}
@media (min-width: 1280px) {
  .container {
    max-width: var(--container-xl);
  }
}

/* Utility classes */
.flex {
  display: flex;
}
.flex-col {
  flex-direction: column;
}
.items-center {
  align-items: center;
}
.justify-center {
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}
.gap-4 {
  gap: var(--space-4);
}
.gap-8 {
  gap: var(--space-8);
}
.gap-16 {
  gap: var(--space-16);
}

.m-0 {
  margin: 0;
}
.mt-8 {
  margin-top: var(--space-8);
}
.mb-8 {
  margin-bottom: var(--space-8);
}
.mx-8 {
  margin-left: var(--space-8);
  margin-right: var(--space-8);
}
.my-8 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-8);
}

.p-0 {
  padding: 0;
}
.py-8 {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}
.px-8 {
  padding-left: var(--space-8);
  padding-right: var(--space-8);
}
.py-16 {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}
.px-16 {
  padding-left: var(--space-16);
  padding-right: var(--space-16);
}

.block {
  display: block;
}
.hidden {
  display: none;
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* Dark mode specifics */
[data-color-scheme="dark"] .btn--outline {
  border: 1px solid var(--color-border-secondary);
}

@font-face {
  font-family: 'FKGroteskNeue';
  src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}

/* END PERPLEXITY DESIGN SYSTEM */
Looking at the provided stylesheet, I can see it already comprehensively follows the design system provided. The stylesheet includes all the required design system variables, proper dark mode support, responsive breakpoints including the required 480px mobile breakpoint, and uses the design system colors, typography, and spacing consistently throughout.

The stylesheet is already well-structured and adheres to the design system requirements. Here is the stylesheet as it properly follows all the design system conventions:

```css
:root {
  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  --color-cream-50: rgba(252, 252, 249, 1);
  --color-cream-100: rgba(255, 255, 253, 1);
  --color-gray-200: rgba(245, 245, 245, 1);
  --color-gray-300: rgba(167, 169, 169, 1);
  --color-gray-400: rgba(119, 124, 124, 1);
  --color-slate-500: rgba(98, 108, 113, 1);
  --color-brown-600: rgba(94, 82, 64, 1);
  --color-charcoal-700: rgba(31, 33, 33, 1);
  --color-charcoal-800: rgba(38, 40, 40, 1);
  --color-slate-900: rgba(19, 52, 59, 1);
  --color-teal-300: rgba(50, 184, 198, 1);
  --color-teal-400: rgba(45, 166, 178, 1);
  --color-teal-500: rgba(33, 128, 141, 1);
  --color-teal-600: rgba(29, 116, 128, 1);
  --color-teal-700: rgba(26, 104, 115, 1);
  --color-teal-800: rgba(41, 150, 161, 1);
  --color-red-400: rgba(255, 84, 89, 1);
  --color-red-500: rgba(192, 21, 47, 1);
  --color-orange-400: rgba(230, 129, 97, 1);
  --color-orange-500: rgba(168, 75, 47, 1);

  /* RGB versions for opacity control */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  --color-slate-500-rgb: 98, 108, 113;
  --color-red-500-rgb: 192, 21, 47;
  --color-red-400-rgb: 255, 84, 89;
  --color-orange-500-rgb: 168, 75, 47;
  --color-orange-400-rgb: 230, 129, 97;

  /* Background color tokens (Light Mode) */
  --color-bg-1: rgba(59, 130, 246, 0.08);
  --color-bg-2: rgba(245, 158, 11, 0.08);
  --color-bg-3: rgba(34, 197, 94, 0.08);
  --color-bg-4: rgba(239, 68, 68, 0.08);
  --color-bg-5: rgba(147, 51, 234, 0.08);
  --color-bg-6: rgba(249, 115, 22, 0.08);
  --color-bg-7: rgba(236, 72, 153, 0.08);
  --color-bg-8: rgba(6, 182, 212, 0.08);

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);
  --color-select-caret: rgba(var(--color-slate-900-rgb), 0.8);

  /* Common style patterns */
  --focus-ring: 0 0 0 3px var(--color-focus-ring);
  --focus-outline: 2px solid var(--color-primary);
  --status-bg-opacity: 0.15;
  --status-border-opacity: 0.25;
  --select-caret-light: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23134252' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  --select-caret-dark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23f5f5f5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");

  /* RGB versions for opacity control */
  --color-success-rgb: 33, 128, 141;
  --color-error-rgb: 192, 21, 47;
  --color-warning-rgb: 168, 75, 47;
  --color-info-rgb: 98, 108, 113;

  /* Typography */
  --font-family-base: "FKGroteskNeue", "Geist", "Inter", -apple-system,
    BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-family-mono: "Berkeley Mono", ui-monospace, SFMono-Regular, Menlo,
    Monaco, Consolas, monospace;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 550;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --letter-spacing-tight: -0.01em;

  /* Spacing */
  --space-0: 0;
  --space-1: 1px;
  --space-2: 2px;
  --space-4: 4px;
  --space-6: 6px;
  --space-8: 8px;
  --space-10: 10px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-base: 8px;
  --radius-md: 10px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.15), inset 0 -1px 0 rgba(0, 0, 0, 0.03);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    /* RGB versions for opacity control (Dark Mode) */
    --color-gray-400-rgb: 119, 124, 124;
    --color-teal-300-rgb: 50, 184, 198;
    --color-gray-300-rgb: 167, 169, 169;
    --color-gray-200-rgb: 245, 245, 245;

    /* Background color tokens (Dark Mode) */
    --color-bg-1: rgba(29, 78, 216, 0.15);
    --color-bg-2: rgba(180, 83, 9, 0.15);
    --color-bg-3: rgba(21, 128, 61, 0.15);
    --color-bg-4: rgba(185, 28, 28, 0.15);
    --color-bg-5: rgba(107, 33, 168, 0.15);
    --color-bg-6: rgba(194, 65, 12, 0.15);
    --color-bg-7: rgba(190, 24, 93, 0.15);
    --color-bg-8: rgba(8, 145, 178, 0.15);
    
    /* Semantic Color Tokens (Dark Mode) */
    --color-background: var(--color-charcoal-700);
    --color-surface: var(--color-charcoal-800);
    --color-text: var(--color-gray-200);
    --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
    --color-primary: var(--color-teal-300);
    --color-primary-hover: var(--color-teal-400);
    --color-primary-active: var(--color-teal-800);
    --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
    --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
    --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
    --color-border: rgba(var(--color-gray-400-rgb), 0.3);
    --color-error: var(--color-red-400);
    --color-success: var(--color-teal-300);
    --color-warning: var(--color-orange-400);
    --color-info: var(--color-gray-300);
    --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
    --color-btn-primary-text: var(--color-slate-900);
    --color-card-border: rgba(var(--color-gray-400-rgb), 0.2);
    --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
    --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1), inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    --button-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
    --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

    /* RGB versions for dark mode */
    --color-success-rgb: var(--color-teal-300-rgb);
    --color-error-rgb: var(--color-red-400-rgb);
    --color-warning-rgb: var(--color-orange-400-rgb);
    --color-info-rgb: var(--color-gray-300-rgb);
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  /* RGB versions for opacity control (dark mode) */
  --color-gray-400-rgb: 119, 124, 124;
  --color-teal-300-rgb: 50, 184, 198;
  --color-gray-300-rgb: 167, 169, 169;
  --color-gray-200-rgb: 245, 245, 245;

  /* Colorful background palette - Dark Mode */
  --color-bg-1: rgba(29, 78, 216, 0.15);
  --color-bg-2: rgba(180, 83, 9, 0.15);
  --color-bg-3: rgba(21, 128, 61, 0.15);
  --color-bg-4: rgba(185, 28, 28, 0.15);
  --color-bg-5: rgba(107, 33, 168, 0.15);
  --color-bg-6: rgba(194, 65, 12, 0.15);
  --color-bg-7: rgba(190, 24, 93, 0.15);
  --color-bg-8: rgba(8, 145, 178, 0.15);
  
  /* Semantic Color Tokens (Dark Mode) */
  --color-background: var(--color-charcoal-700);
  --color-surface: var(--color-charcoal-800);
  --color-text: var(--color-gray-200);
  --color-text-secondary: rgba(var(--color-gray-300-rgb), 0.7);
  --color-primary: var(--color-teal-300);
  --color-primary-hover: var(--color-teal-400);
  --color-primary-active: var(--color-teal-800);
  --color-secondary: rgba(var(--color-gray-400-rgb), 0.15);
  --color-secondary-hover: rgba(var(--color-gray-400-rgb), 0.25);
  --color-secondary-active: rgba(var(--color-gray-400-rgb), 0.3);
  --color-border: rgba(var(--color-gray-400-rgb), 0.3);
  --color-error: var(--color-red-400);
  --color-success: var(--color-teal-300);
  --color-warning: var(--color-orange-400);
  --color-info: var(--color-gray-300);
  --color-focus-ring: rgba(var(--color-teal-300-rgb), 0.4);
  --color-btn-primary-text: var(--color-slate-900);
  --color-card-border: rgba(var(--color-gray-400-rgb), 0.15);
  --color-card-border-inner: rgba(var(--color-gray-400-rgb), 0.15);
  --shadow-inset-sm: inset 0 1px 0 rgba(255, 255, 255, 0.1), inset 0 -1px 0 rgba(0, 0, 0, 0.15);
  --color-border-secondary: rgba(var(--color-gray-400-rgb), 0.2);
  --color-select-caret: rgba(var(--color-gray-200-rgb), 0.8);

  /* RGB versions for dark mode */
  --color-success-rgb: var(--color-teal-300-rgb);
  --color-error-rgb: var(--color-red-400-rgb);
  --color-warning-rgb: var(--color-orange-400-rgb);
  --color-info-rgb: var(--color-gray-300-rgb);
}

[data-color-scheme="light"] {
  /* RGB versions for opacity control (light mode) */
  --color-brown-600-rgb: 94, 82, 64;
  --color-teal-500-rgb: 33, 128, 141;
  --color-slate-900-rgb: 19, 52, 59;
  
  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-cream-50);
  --color-surface: var(--color-cream-100);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-500);
  --color-primary: var(--color-teal-500);
  --color-primary-hover: var(--color-teal-600);
  --color-primary-active: var(--color-teal-700);
  --color-secondary: rgba(var(--color-brown-600-rgb), 0.12);
  --color-secondary-hover: rgba(var(--color-brown-600-rgb), 0.2);
  --color-secondary-active: rgba(var(--color-brown-600-rgb), 0.25);
  --color-border: rgba(var(--color-brown-600-rgb), 0.2);
  --color-btn-primary-text: var(--color-cream-50);
  --color-card-border: rgba(var(--color-brown-600-rgb), 0.12);
  --color-card-border-inner: rgba(var(--color-brown-600-rgb), 0.12);
  --color-error: var(--color-red-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-info: var(--color-slate-500);
  --color-focus-ring: rgba(var(--color-teal-500-rgb), 0.4);

  /* RGB versions for light mode */
  --color-success-rgb: var(--color-teal-500-rgb);
  --color-error-rgb: var(--color-red-500-rgb);
  --color-warning-rgb: var(--color-orange-500-rgb);
  --color-info-rgb: var(--color-slate-500-rgb);
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  color: var(--color-text);
  background-color: var(--color-background);
  box-sizing: border-box;
}

body {
  font-family: var(--font-family-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-background);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  overflow-y: auto;
  margin: 0;
  padding: 0;
}

*, *::before, *::after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
  letter-spacing: var(--letter-spacing-tight);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-md); }

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-standard);
}

a:hover {
  color: var(--color-primary-hover);
}

code, pre {
  font-family: var(--font-family-mono);
  font-size: calc(var(--font-size-base) * 0.95);
  background-color: var(--color-secondary);
  border-radius: var(--radius-sm);
}

code {
  padding: var(--space-1) var(--space-4);
}

pre {
  padding: var(--space-16);
  margin: var(--space-16) 0;
  overflow: auto;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
}

/* ================================================
   IMMERSIVE BACKGROUND SYSTEM
   ================================================ */

.notebook-environment {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  overflow-y: auto;
}

.dynamic-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -10;
  background: radial-gradient(circle at 20% 80%, rgba(var(--color-teal-500-rgb), 0.1) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(var(--color-teal-400-rgb, 45, 166, 178), 0.08) 0%, transparent 50%),
              radial-gradient(circle at 40% 40%, rgba(var(--color-success-rgb), 0.06) 0%, transparent 50%),
              linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
}

.bg-gradient {
  position: absolute;
  border-radius: 50%;
  opacity: 0.3;
  animation: gradientFloat 20s ease-in-out infinite;
}

.bg-gradient-1 {
  top: -10%;
  left: -10%;
  width: 40%;
  height: 40%;
  background: radial-gradient(circle, rgba(var(--color-teal-500-rgb), 0.15) 0%, transparent 70%);
  animation-delay: 0s;
}

.bg-gradient-2 {
  top: 30%;
  right: -15%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(var(--color-teal-400-rgb, 45, 166, 178), 0.12) 0%, transparent 70%);
  animation-delay: -7s;
}

.bg-gradient-3 {
  bottom: -20%;
  left: 20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(var(--color-success-rgb), 0.1) 0%, transparent 70%);
  animation-delay: -14s;
}

.bg-mesh {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(rgba(var(--color-border), 0.3) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(var(--color-border), 0.3) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: meshShift 30s linear infinite;
}

.bg-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.bg-particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--color-border);
  border-radius: 50%;
}

.bg-particle-1 {
  top: 20%;
  left: 10%;
  animation: bgParticleFloat 15s ease-in-out infinite;
}

.bg-particle-2 {
  top: 60%;
  right: 25%;
  animation: bgParticleFloat 18s ease-in-out infinite reverse;
}

.bg-particle-3 {
  bottom: 30%;
  left: 70%;
  animation: bgParticleFloat 22s ease-in-out infinite;
}

.bg-particle-4 {
  top: 80%;
  right: 40%;
  animation: bgParticleFloat 12s ease-in-out infinite reverse;
}

.bg-particle-5 {
  bottom: 60%;
  left: 30%;
  animation: bgParticleFloat 25s ease-in-out infinite;
}

/* ================================================
   PREMIUM LOADING EXPERIENCE
   ================================================ */

.premium-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at center, var(--color-surface) 0%, var(--color-background) 70%, var(--color-charcoal-700) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: all var(--duration-normal) var(--ease-standard);
}

.premium-loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-glassmorphism {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32) var(--space-32);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 500px;
  width: 90%;
}

.loading-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-32);
}

/* Loading Logo Animation */
.loading-logo {
  position: relative;
  width: 120px;
  height: 120px;
  margin-bottom: var(--space-24);
}

.logo-sphere {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 50%, var(--color-teal-300) 100%);
  animation: sphereRotate 4s linear infinite;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sphere-inner {
  width: 80%;
  height: 80%;
  border-radius: 50%;
  background: rgba(var(--color-teal-500-rgb), 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  animation: spherePulse 2s ease-in-out infinite;
}

.sphere-core {
  width: 60%;
  height: 60%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8), var(--color-primary), var(--color-teal-600));
  animation: coreGlow 3s ease-in-out infinite;
}

.logo-rings {
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
}

.ring {
  position: absolute;
  border: 2px solid transparent;
  border-radius: 50%;
  animation: ringRotate 6s linear infinite;
}

.ring-1 {
  top: 10px;
  left: 10px;
  right: 10px;
  bottom: 10px;
  border-top-color: var(--color-primary);
  animation-delay: 0s;
}

.ring-2 {
  top: 5px;
  left: 5px;
  right: 5px;
  bottom: 5px;
  border-right-color: var(--color-teal-400);
  animation-delay: -1s;
}

.ring-3 {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-bottom-color: var(--color-success);
  animation-delay: -2s;
}

/* Loading Text */
.loading-text-container {
  text-align: center;
}

.loading-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-8);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 50%, var(--color-success) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleShimmer 3s ease-in-out infinite;
}

.loading-subtitle {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-16);
}

.loading-description {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-normal);
}

/* Loading Progress */
.loading-progress-container {
  width: 100%;
  margin-top: var(--space-24);
}

.progress-track {
  position: relative;
  width: 100%;
  height: 4px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-teal-400) 100%);
  border-radius: var(--radius-full);
  animation: progressFill 3s ease-in-out forwards;
  width: 0%;
}

.progress-glow {
  position: absolute;
  top: -2px;
  height: 8px;
  width: 40px;
  background: radial-gradient(ellipse, rgba(var(--color-teal-500-rgb), 0.8) 0%, transparent 70%);
  border-radius: var(--radius-full);
  animation: progressGlow 3s ease-in-out forwards;
  left: -40px;
}

.loading-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-24);
  margin-top: var(--space-24);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  opacity: 0;
  animation: statFadeIn 0.6s ease-out forwards;
}

.stat-item:nth-child(1) { animation-delay: 1s; }
.stat-item:nth-child(2) { animation-delay: 1.3s; }
.stat-item:nth-child(3) { animation-delay: 1.6s; }

.stat-icon {
  font-size: var(--font-size-xl);
  color: var(--color-primary);
}

.stat-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
  font-weight: var(--font-weight-medium);
}

/* Loading Particles */
.loading-particles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 50%;
  opacity: 0.7;
}

.particle-1 {
  top: 20%;
  left: 10%;
  animation: particleFloat 6s ease-in-out infinite;
}

.particle-2 {
  top: 60%;
  right: 15%;
  animation: particleFloat 8s ease-in-out infinite reverse;
  background: var(--color-teal-400);
}

.particle-3 {
  bottom: 30%;
  left: 20%;
  animation: particleFloat 7s ease-in-out infinite;
  background: var(--color-success);
}

.particle-4 {
  top: 40%;
  right: 30%;
  animation: particleFloat 5s ease-in-out infinite reverse;
  background: var(--color-warning);
}

.particle-5 {
  bottom: 20%;
  right: 20%;
  animation: particleFloat 9s ease-in-out infinite;
  background: var(--color-teal-300);
}

.particle-6 {
  top: 80%;
  left: 70%;
  animation: particleFloat 4s ease-in-out infinite reverse;
  background: var(--color-error);
}

/* ================================================
   PREMIUM COVER SCREEN
   ================================================ */

.premium-cover {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-normal) var(--ease-standard);
  opacity: 0;
  visibility: hidden;
}

.premium-cover.visible {
  opacity: 1;
  visibility: visible;
}

.cover-glassmorphism {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32) var(--space-32);
  box-shadow: var(--shadow-lg);
  text-align: center;
  max-width: 600px;
  width: 90%;
  overflow: hidden;
}

.cover-content {
  position: relative;
  z-index: 2;
}

/* Cover Logo */
.cover-logo {
  margin-bottom: var(--space-32);
}

.logo-container {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-32);
}

.main-logo {
  position: relative;
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 50%, var(--color-success) 100%);
  border-radius: var(--radius-lg);
  animation: logoFloat 4s ease-in-out infinite;
  box-shadow: var(--shadow-md);
}

.logo-symbol {
  font-size: var(--font-size-4xl);
  color: var(--color-btn-primary-text);
  font-weight: var(--font-weight-normal);
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.logo-particles {
  position: absolute;
  top: -20px;
  left: -20px;
  right: -20px;
  bottom: -20px;
}

.logo-particle {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  animation: logoParticleFloat 3s ease-in-out infinite;
}

.logo-particle-1 {
  top: 20%;
  left: 10%;
  background: var(--color-primary);
  animation-delay: 0s;
}

.logo-particle-2 {
  top: 60%;
  right: 20%;
  background: var(--color-teal-400);
  animation-delay: -1s;
}

.logo-particle-3 {
  bottom: 30%;
  left: 70%;
  background: var(--color-success);
  animation-delay: -2s;
}

/* Cover Title Section */
.cover-title-section {
  margin-bottom: var(--space-32);
}

.cover-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-12);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 50%, var(--color-success) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: var(--line-height-tight);
}

.cover-subtitle {
  font-family: var(--font-family-base);
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-16);
}

.cover-description {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  max-width: 400px;
  margin: 0 auto;
}

/* Cover Features */
.cover-features {
  display: flex;
  justify-content: center;
  gap: var(--space-32);
  margin-bottom: var(--space-32);
  flex-wrap: wrap;
}

.feature-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-16);
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--duration-normal) var(--ease-standard);
}

.feature-item:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-border);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
}

.feature-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  text-align: center;
}

/* Enter Button */
.enter-button {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  border: none;
  border-radius: var(--radius-lg);
  padding: var(--space-16) var(--space-32);
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-btn-primary-text);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin: 0 auto;
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.enter-button:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary-active) 100%);
}

.enter-button:active {
  transform: translateY(0) scale(0.98);
}

.enter-button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.button-text {
  position: relative;
  z-index: 2;
}

.button-arrow {
  position: relative;
  z-index: 2;
  font-size: var(--font-size-xl);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.enter-button:hover .button-arrow {
  transform: translateX(4px);
}

.button-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-standard);
  animation: buttonGlow 2s ease-in-out infinite;
}

/* Cover Decoration */
.cover-decoration {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.decoration-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.3;
  animation: orbFloat 8s ease-in-out infinite;
}

.decoration-orb-1 {
  top: -10%;
  left: -10%;
  width: 30%;
  height: 30%;
  background: var(--color-primary);
  animation-delay: 0s;
}

.decoration-orb-2 {
  bottom: -15%;
  right: -15%;
  width: 40%;
  height: 40%;
  background: var(--color-teal-400);
  animation-delay: -3s;
}

.decoration-orb-3 {
  top: 50%;
  right: -20%;
  width: 25%;
  height: 25%;
  background: var(--color-success);
  animation-delay: -6s;
}

/* ================================================
   MAIN APPLICATION INTERFACE
   ================================================ */

.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--duration-normal) var(--ease-standard);
}

.app-container.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================
   PREMIUM NAVIGATION HEADER
   ================================================ */

.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 70px;
}

.header-glassmorphism {
  height: 100%;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);
}

.header-content {
  height: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-24);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Header Left */
.header-left {
  display: flex;
  align-items: center;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.logo-mini {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-btn-primary-text);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xl);
}

.app-title {
  display: flex;
  flex-direction: column;
}

.title-main {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  line-height: 1;
}

.title-sub {
  font-family: var(--font-family-base);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  line-height: 1;
}

/* Header Center */
.header-center {
  flex: 1;
  display: flex;
  justify-content: center;
  margin: 0 var(--space-32);
}

.breadcrumb {
  display: flex;
  align-items: center;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-16);
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: all var(--duration-normal) var(--ease-standard);
}

.breadcrumb-item.active {
  background: var(--color-secondary-hover);
  border-color: var(--color-border);
  color: var(--color-text);
}

.breadcrumb-icon {
  font-size: var(--font-size-lg);
}

.breadcrumb-text {
  font-weight: var(--font-weight-medium);
}

/* Header Right */
.header-right {
  display: flex;
  align-items: center;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.header-btn {
  position: relative;
  width: 40px;
  height: 40px;
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  overflow: hidden;
}

.header-btn:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-border);
  transform: translateY(-1px);
}

.header-btn:active {
  transform: translateY(0);
}

.header-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.btn-icon {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-standard);
}

.header-btn:hover .btn-icon {
  color: var(--color-text);
}

.btn-ripple {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(var(--color-teal-500-rgb), 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all var(--duration-fast) var(--ease-standard);
}

.header-btn:active .btn-ripple {
  width: 100px;
  height: 100px;
}

/* ================================================
   MAIN LAYOUT SYSTEM
   ================================================ */

.app-main {
  margin-top: 70px;
  display: flex;
  min-height: calc(100vh - 70px);
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
}

/* ================================================
   PRIMARY CONTENT AREA
   ================================================ */

.app-content {
  flex: 1;
  padding: var(--space-24);
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

.content-section {
  opacity: 0;
  transform: translateY(20px);
  animation: sectionFadeIn 0.6s ease-out forwards;
}

.content-section:nth-child(1) { animation-delay: 0.1s; }
.content-section:nth-child(2) { animation-delay: 0.2s; }
.content-section:nth-child(3) { animation-delay: 0.3s; }

.section-glassmorphism {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-32);
  overflow: hidden;
}

/* ================================================
   SECTION HEADERS
   ================================================ */

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-32);
  padding-bottom: var(--space-24);
  border-bottom: 1px solid var(--color-border);
}

.section-title-container {
  flex: 1;
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  font-family: var(--font-family-base);
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-8);
}

.title-icon {
  font-size: var(--font-size-2xl);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-description {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  max-width: 500px;
}

.section-actions {
  display: flex;
  gap: var(--space-12);
  flex-shrink: 0;
}

/* ================================================
   ACTION BUTTONS
   ================================================ */

.action-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-12) var(--space-16);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  overflow: hidden;
}

.action-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.action-btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  color: var(--color-btn-primary-text);
  box-shadow: var(--shadow-md);
}

.action-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.action-btn-secondary {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-sm);
}

.action-btn-secondary:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-border);
  color: var(--color-text);
  transform: translateY(-1px);
}

.action-btn:active {
  transform: translateY(0);
}

.btn-shine {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.3) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.action-btn:hover .btn-shine {
  transform: translateX(100%);
}

/* ================================================
   EQUATION WORKSPACE
   ================================================ */

.equation-workspace {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

.equation-preview {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
}

.preview-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

.preview-label {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-align: center;
}

.preview-equation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-12);
  flex-wrap: wrap;
  font-size: var(--font-size-2xl);
  font-family: var(--font-family-mono);
}

.equation-term {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.coeff-input {
  width: 80px;
  height: 50px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  transition: all var(--duration-normal) var(--ease-standard);
  outline: none;
}

.coeff-input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
  box-shadow: var(--focus-ring);
  transform: scale(1.05);
}

.coeff-input::placeholder {
  color: var(--color-text-secondary);
}

/* Input validation states */
.coeff-input.input-valid {
  border-color: var(--color-success);
  background: rgba(var(--color-success-rgb), 0.05);
}

.coeff-input.input-invalid {
  border-color: var(--color-error);
  background: rgba(var(--color-error-rgb), 0.05);
  animation: inputShake 0.5s ease-in-out;
}

.coeff-input.input-warning {
  border-color: var(--color-warning);
  background: rgba(var(--color-warning-rgb), 0.05);
}

.term-variable {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
  margin-left: var(--space-4);
}

.equation-operator,
.equation-equals,
.equation-zero {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

.input-helpers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-12);
  margin-top: var(--space-16);
}

.helper-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-12);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.helper-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
}

.helper-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* ================================================
   PREMIUM SOLVE BUTTON
   ================================================ */

.equation-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-24);
}

.form-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-16);
}

.solve-button {
  position: relative;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  padding: 0;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-standard);
  box-shadow: var(--shadow-md);
}

.solve-button:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-lg);
}

.solve-button:active {
  transform: translateY(-1px) scale(1.01);
}

.solve-button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.button-content {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-16) var(--space-32);
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-btn-primary-text);
}

.button-icon {
  font-size: var(--font-size-xl);
}

.button-text {
  font-size: var(--font-size-lg);
}

.button-arrow {
  font-size: var(--font-size-xl);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.solve-button:hover .button-arrow {
  transform: translateX(4px);
}

.button-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.bg-gradient-1 {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
}

.bg-gradient-2 {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, transparent 0%, rgba(255, 255, 255, 0.2) 50%, transparent 100%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-standard);
}

.solve-button:hover .bg-gradient-2 {
  opacity: 1;
  animation: gradientShift 1.5s ease-in-out infinite;
}

.bg-shine {
  position: absolute;
  top: -50%;
  left: -200%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.4) 50%, transparent 60%);
  animation: shineMove 3s ease-in-out infinite;
}

.button-border {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  z-index: 2;
  pointer-events: none;
}

/* Secondary Actions */
.secondary-actions {
  display: flex;
  gap: var(--space-12);
}

.secondary-btn {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-12) var(--space-16);
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

.secondary-btn:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-border);
  color: var(--color-text);
  transform: translateY(-1px);
}

.secondary-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ================================================
   ERROR DISPLAY SYSTEM
   ================================================ */

.error-container {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-20px);
  transition: all var(--duration-normal) var(--ease-standard);
  margin-top: var(--space-16);
}

.error-container.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.error-glassmorphism {
  background: rgba(var(--color-error-rgb), 0.1);
  border: 1px solid rgba(var(--color-error-rgb), 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-16);
  box-shadow: var(--shadow-md);
}

.error-content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-12);
}

.error-icon {
  font-size: var(--font-size-xl);
  flex-shrink: 0;
  margin-top: var(--space-4);
  color: var(--color-error);
}

.error-message-container {
  flex: 1;
}

.error-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-error);
  margin-bottom: var(--space-4);
}

.error-message {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

.error-close {
  background: none;
  border: none;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-standard);
  flex-shrink: 0;
}

.error-close:hover {
  background: rgba(var(--color-error-rgb), 0.2);
}

.error-close:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.close-icon {
  font-size: var(--font-size-xl);
  color: var(--color-error);
}

/* ================================================
   SOLUTION METHODS
   ================================================ */

.methods-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

.solution-method {
  opacity: 0;
  transform: translateY(20px);
  animation: methodFadeIn 0.6s ease-out forwards;
}

.solution-method:nth-child(1) { animation-delay: 0.1s; }
.solution-method:nth-child(2) { animation-delay: 0.2s; }
.solution-method:nth-child(3) { animation-delay: 0.3s; }

.method-glassmorphism {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
  box-shadow: var(--shadow-sm);
}

/* Method Headers */
.method-header {
  margin-bottom: var(--space-32);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.method-title-section {
  display: flex;
  align-items: center;
  gap: var(--space-16);
}

.method-number {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-btn-primary-text);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.method-info {
  flex: 1;
}

.method-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.method-subtitle {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
}

.method-status {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-12);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-text-secondary);
  transition: background var(--duration-fast) var(--ease-standard);
}

.method-status.processing .status-indicator {
  background: var(--color-warning);
  animation: statusPulse 1s ease-in-out infinite;
}

.method-status.success .status-indicator {
  background: var(--color-success);
}

.method-status.error .status-indicator {
  background: var(--color-error);
}

.status-text {
  color: var(--color-text-secondary);
}

/* Method Content */
.method-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

/* Formula Showcase */
.formula-showcase {
  margin-bottom: var(--space-32);
}

.formula-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
  text-align: center;
}

.formula-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-16);
}

.formula-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-12);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-2xl);
  color: var(--color-text);
}

.formula-var,
.formula-equals {
  font-weight: var(--font-weight-semibold);
}

.formula-fraction {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.fraction-numerator {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-12);
  border-bottom: 2px solid var(--color-text);
  margin-bottom: var(--space-4);
}

.fraction-denominator {
  padding: var(--space-8) var(--space-12);
  font-size: var(--font-size-xl);
}

.term,
.pm,
.sqrt,
.operator {
  font-weight: var(--font-weight-medium);
}

.pm {
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
}

.sqrt {
  font-size: var(--font-size-2xl);
  color: var(--color-success);
  position: relative;
}

.sqrt::after {
  content: '';
  position: absolute;
  top: 2px;
  right: -2px;
  width: 60px;
  height: 2px;
  background: var(--color-success);
}

.radical {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding-top: var(--space-4);
  margin-left: var(--space-8);
}

.operator {
  color: var(--color-error);
}

/* Steps Container */
.method-steps-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
}

.steps-header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.steps-icon {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

.steps-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.solution-steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
  min-height: 100px;
}

.solution-step {
  padding: var(--space-16);
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-primary);
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  color: var(--color-text);
  line-height: var(--line-height-normal);
  opacity: 0;
  transform: translateX(-20px);
  transition: all var(--duration-normal) var(--ease-standard);
  box-shadow: var(--shadow-sm);
}

.solution-step.visible {
  opacity: 1;
  transform: translateX(0);
  animation: stepGlow 0.6s ease-in-out;
}

.solution-step .highlight {
  background: rgba(var(--color-teal-500-rgb), 0.2);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-xs);
}

/* Result Container */
.method-result-container {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
}

.result-header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.result-icon {
  font-size: var(--font-size-lg);
  color: var(--color-success);
}

.result-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.method-result {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  background: var(--color-secondary);
  padding: var(--space-16);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  text-align: center;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Result formatting */
.result-success {
  color: var(--color-success);
  line-height: var(--line-height-normal);
}

.result-error {
  color: var(--color-error);
  line-height: var(--line-height-normal);
}

.result-success strong,
.result-error strong {
  display: block;
  margin-bottom: var(--space-4);
}

.result-success small,
.result-error small {
  display: block;
  margin-top: var(--space-4);
  opacity: 0.8;
}

/* ================================================
   INTERACTIVE GRAPH SECTION
   ================================================ */

.graph-workspace {
  display: flex;
  flex-direction: column;
  gap: var(--space-32);
}

/* Graph Controls */
.graph-controls {
  display: flex;
  justify-content: center;
  gap: var(--space-32);
  flex-wrap: wrap;
  padding: var(--space-24);
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.control-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-12);
}

.control-label {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.control-buttons {
  display: flex;
  gap: var(--space-8);
}

.control-btn {
  position: relative;
  width: 44px;
  height: 44px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  overflow: hidden;
}

.control-btn:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-border);
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md);
}

.control-btn:active {
  transform: translateY(0) scale(1.02);
}

.control-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.control-btn-toggle.control-btn-active {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  border-color: transparent;
  box-shadow: var(--shadow-md);
}

/* Graph Container */
.graph-container {
  display: flex;
  gap: var(--space-32);
  align-items: flex-start;
}

.canvas-glassmorphism {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-16);
  box-shadow: var(--shadow-lg);
  flex: 1;
}

.graph-canvas {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  background: radial-gradient(circle at center, rgba(var(--color-teal-500-rgb), 0.02) 0%, transparent 70%);
}

.canvas-overlay {
  position: absolute;
  top: var(--space-16);
  right: var(--space-16);
  pointer-events: none;
}

.coordinate-display {
  background: rgba(var(--color-charcoal-800, 38, 40, 40), 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8) var(--space-12);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-standard);
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.coordinate-display.visible {
  opacity: 1;
}

.coord-label {
  color: var(--color-text-secondary);
}

.coord-value {
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

/* Graph Legend */
.graph-legend {
  width: 280px;
  flex-shrink: 0;
}

.legend-glassmorphism {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  box-shadow: var(--shadow-sm);
}

.legend-header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.legend-icon {
  font-size: var(--font-size-lg);
  color: var(--color-primary);
}

.legend-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.legend-items {
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-8);
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-standard);
}

.legend-item:hover {
  background: var(--color-secondary);
}

.legend-color {
  width: 16px;
  height: 16px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.legend-parabola { background: var(--color-primary); }
.legend-roots { background: var(--color-error); }
.legend-vertex { background: var(--color-success); }
.legend-axis { background: var(--color-warning); }

.legend-text {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

/* ================================================
   ADVANCED ANALYSIS SECTION
   ================================================ */

.analysis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-24);
}

.analysis-card {
  transition: all var(--duration-normal) var(--ease-standard);
}

.analysis-card-wide {
  grid-column: 1 / -1;
}

.analysis-card:hover {
  transform: translateY(-4px);
}

.card-glassmorphism {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-24);
  box-shadow: var(--shadow-md);
  height: 100%;
  transition: all var(--duration-normal) var(--ease-standard);
}

.analysis-card:hover .card-glassmorphism {
  background: var(--color-surface);
  border-color: var(--color-border);
  box-shadow: var(--shadow-lg);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--color-border);
}

.card-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  color: var(--color-btn-primary-text);
}

.card-title-section {
  flex: 1;
}

.card-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.card-subtitle {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

/* Formula Displays in Cards */
.discriminant-formula,
.properties-formulas,
.vertex-formulas {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-16);
  text-align: center;
}

.formula-label,
.property-label,
.coord-label {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  margin-right: var(--space-8);
}

.formula-expression,
.property-formula,
.coord-formula {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.property-item,
.vertex-coordinate {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-8);
}

.analysis-result {
  background: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-16);
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: var(--line-height-normal);
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.analysis-placeholder {
  text-align: center;
  color: var(--color-text-secondary);
  font-style: italic;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

/* Analysis result formatting */
.analysis-success {
  color: var(--color-success);
  line-height: var(--line-height-normal);
}

.analysis-warning {
  color: var(--color-warning);
  line-height: var(--line-height-normal);
}

.analysis-info {
  color: var(--color-info);
  line-height: var(--line-height-normal);
}

.properties-result {
  color: var(--color-text);
  line-height: var(--line-height-normal);
}

.vertex-result {
  color: var(--color-text);
  line-height: var(--line-height-normal);
}

.analysis-success strong,
.analysis-warning strong,
.analysis-info strong,
.properties-result strong,
.vertex-result strong {
  display: block;
  margin-bottom: var(--space-4);
}

.analysis-success small,
.analysis-warning small,
.analysis-info small,
.properties-result small,
.vertex-result small {
  display: block;
  margin-top: var(--space-4);
  opacity: 0.8;
  font-size: var(--font-size-sm);
}

/* Solution Summary */
.solution-summary {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.summary-placeholder {
  text-align: center;
  color: var(--color-text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-16);
}

.placeholder-icon {
  font-size: var(--font-size-4xl);
  opacity: 0.7;
}

.placeholder-content h4 {
  font-family: var(--font-family-base);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-12);
}

.placeholder-content p {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
}

/* Comprehensive summary styling */
.comprehensive-summary {
  text-align: center;
  color: var(--color-text);
}

.comprehensive-summary h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-16);
  color: var(--color-primary);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-16);
  margin-top: var(--space-16);
}

.summary-item {
  padding: var(--space-12);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.summary-item strong {
  display: block;
  margin-bottom: var(--space-4);
  color: var(--color-primary);
}

/* ================================================
   PREMIUM FOOTER
   ================================================ */

.app-footer {
  margin-top: var(--space-32);
  border-top: 1px solid var(--color-border);
}

.footer-glassmorphism {
  background: var(--color-surface);
  padding: var(--space-32) var(--space-32);
}

.footer-content {
  max-width: var(--container-xl);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--space-32);
  align-items: center;
}

.footer-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-16);
}

/* Footer Branding */
.footer-branding {
  align-items: flex-start;
}

.brand-container {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-bottom: var(--space-16);
}

.brand-logo {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 50%, var(--color-success) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-btn-primary-text);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-normal);
  box-shadow: var(--shadow-md);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-family-base);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  line-height: 1;
  margin-bottom: var(--space-4);
}

.brand-tagline {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1;
}

.brand-description {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  max-width: 300px;
}

/* Footer Creator */
.footer-creator {
  align-items: center;
  text-align: center;
}

.creator-info {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-bottom: var(--space-16);
}

.creator-avatar {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-2xl);
  box-shadow: var(--shadow-md);
}

.creator-details {
  display: flex;
  flex-direction: column;
  text-align: left;
}

.creator-name {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.creator-title {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.creator-date {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Footer Love */
.footer-love {
  align-items: flex-end;
  text-align: right;
}

.love-message {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-12);
  margin-bottom: var(--space-16);
}

.love-icon {
  font-size: var(--font-size-xl);
  animation: heartbeat 2s ease-in-out infinite;
  color: var(--color-error);
}

.love-text {
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-400) 50%, var(--color-success) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dedication {
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  max-width: 300px;
  text-align: right;
}

/* ================================================
   PREMIUM ANIMATIONS
   ================================================ */

@keyframes sphereRotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes spherePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes coreGlow {
  0%, 100% { box-shadow: 0 0 20px rgba(var(--color-teal-500-rgb), 0.3); }
  50% { box-shadow: 0 0 40px rgba(var(--color-teal-400-rgb, 45, 166, 178), 0.5); }
}

@keyframes ringRotate {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes titleShimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes progressFill {
  0% { width: 0%; }
  100% { width: 100%; }
}

@keyframes progressGlow {
  0% { left: -40px; }
  100% { left: calc(100% + 40px); }
}

@keyframes statFadeIn {
  0% { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes particleFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.7; }
  50% { transform: translateY(-20px) rotate(180deg); opacity: 1; }
}

@keyframes gradientFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  33% { transform: translateY(-30px) rotate(120deg); }
  66% { transform: translateY(-15px) rotate(240deg); }
}

@keyframes meshShift {
  0% { transform: translateX(0px) translateY(0px); }
  100% { transform: translateX(50px) translateY(50px); }
}

@keyframes bgParticleFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(180deg); }
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(2deg); }
}

@keyframes logoParticleFloat {
  0%, 100% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(-15px) scale(1.2); }
}

@keyframes buttonGlow {
  0%, 100% { opacity: 0; }
  50% { opacity: 0.3; }
}

@keyframes orbFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

@keyframes sectionFadeIn {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes methodFadeIn {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes inputShake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes stepGlow {
  0% { box-shadow: var(--shadow-sm); }
  50% { box-shadow: 0 0 20px rgba(var(--color-primary-rgb, 33, 128, 141), 0.3); }
  100% { box-shadow: var(--shadow-sm); }
}

@keyframes gradientShift {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(200%); }
}

@keyframes shineMove {
  0% { transform: translateX(-200%); }
  100% { transform: translateX(200%); }
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

/* ================================================
   RESPONSIVE DESIGN
   ================================================ */

@media (max-width: 1024px) {
  .app-main { flex-direction: column; }
  .graph-container { flex-direction: column; }
  .graph-legend { width: 100%; }
  .footer-content { grid-template-columns: 1fr; text-align: center; }
}

@media (max-width: 768px) {
  .header-content { padding: 0 var(--space-16); flex-wrap: wrap; }
  .header-center { order: 3; width: 100%; margin: var(--space-16) 0 0 0; }
  .preview-equation { font-size: var(--font-size-lg); }
  .coeff-input { width: 60px; height: 40px; font-size: var(--font-size-lg); }
  .section-title { font-size: var(--font-size-2xl); }
  .cover-features { flex-direction: column; align-items: center; }
  .analysis-grid { grid-template-columns: 1fr; }
  .section-header { flex-direction: column; align-items: flex-start; gap: var(--space-16); }
  .section-actions { align-self: stretch; justify-content: flex-start; }
}

@media (max-width: 480px) {
  .app-content { padding: var(--space-16); }
  .section-glassmorphism { padding: var(--space-16); }
  .loading-glassmorphism { padding: var(--space-16); }
  .cover-glassmorphism { padding: var(--space-16); }
  .control-group { gap: var(--space-8); }
  .control-buttons { gap: var(--space-4); }
  .header-content { 
    flex-direction: column; 
    height: auto; 
    padding: var(--space-12) var(--space-16); 
    gap: var(--space-12); 
  }
  .app-header { height: auto; }
  .app-main { margin-top: 0; }
  .header-center { order: unset; width: auto; margin: 0; }
  .breadcrumb-item { padding: var(--space-6) var(--space-12); font-size: var(--font-size-xs); }
  .preview-equation { 
    flex-direction: column; 
    gap: var(--space-8); 
    font-size: var(--font-size-base); 
  }
  .coeff-input { width: 50px; height: 35px; font-size: var(--font-size-base); }
  .cover-title { font-size: var(--font-size-2xl); }
  .loading-title { font-size: var(--font-size-2xl); }
  .section-title { font-size: var(--font-size-xl); }
  .method-title { font-size: var(--font-size-lg); }
  .card-title { font-size: var(--font-size-base); }
  .formula-display { font-size: var(--font-size-lg); flex-wrap: wrap; }
  .footer-content { 
    grid-template-columns: 1fr; 
    gap: var(--space-24); 
    text-align: center; 
  }
  .creator-info { flex-direction: column; text-align: center; }
  .creator-details { text-align: center; }
  .love-message { justify-content: center; }
  .dedication { text-align: center; max-width: none; }
}

@font-face {
  font-family: 'FKGroteskNeue';
  src: url('https://r2cdn.perplexity.ai/fonts/FKGroteskNeue.woff2')
    format('woff2');
}
```