: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 */
/* Custom styles for POO Java Educational App */

/* SENAC Brand Colors - Modernized */
:root {
  --senac-blue: #003d82;
  --senac-orange: #ff6b35;
  --senac-light-blue: #0056b3;
  --senac-light-orange: #ff8c5a;

  /* Modern gradient variants */
  --gradient-primary: linear-gradient(135deg, #003d82 0%, #0056b3 100%);
  --gradient-secondary: linear-gradient(135deg, #ff6b35 0%, #ff8c5a 100%);
  --gradient-accent: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
  --gradient-card: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0.05) 100%
  );

  /* Glassmorphism effects */
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);

  /* Modern shadows */
  --shadow-soft: 0 2px 20px rgba(0, 0, 0, 0.08);
  --shadow-medium: 0 4px 30px rgba(0, 0, 0, 0.12);
  --shadow-strong: 0 8px 60px rgba(0, 0, 0, 0.15);
  --shadow-colored: 0 4px 20px rgba(0, 61, 130, 0.25);
}

/* Additional theme-specific overrides */
:root {
  --color-brand-primary: var(--senac-blue);
  --color-brand-secondary: var(--senac-orange);
  --color-sidebar-bg: var(--color-surface);
  --color-sidebar-border: var(--color-border);
  --color-code-bg: var(--color-bg-1);

  /* Modern accent colors */
  --color-accent-purple: #6366f1;
  --color-accent-pink: #ec4899;
  --color-accent-cyan: #06b6d4;
  --color-accent-emerald: #10b981;
}

[data-color-scheme="dark"] {
  --color-sidebar-bg: var(--color-charcoal-800);
  --color-sidebar-border: var(--color-border);
  --color-code-bg: var(--color-bg-1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-sidebar-bg: var(--color-charcoal-800);
    --color-sidebar-border: var(--color-border);
    --color-code-bg: var(--color-bg-1);
  }
}

/* Layout Structure */
.main-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 120px);
  transition: grid-template-columns var(--duration-normal) var(--ease-standard);
}

.main-container.study-mode {
  grid-template-columns: 0px 1fr;
}

.main-container.study-mode .sidebar {
  transform: translateX(-100%);
  opacity: 0;
}

@media (max-width: 768px) {
  .main-container {
    grid-template-columns: 1fr;
  }
}

/* Header Styles - Modernized */
.header {
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: var(--space-20) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-medium);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-32);
}

.logo {
  position: relative;
}

.logo h1 {
  color: var(--color-white);
  font-size: var(--font-size-3xl);
  margin: 0;
  font-weight: var(--font-weight-bold);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}

.logo h1::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: 3px;
  background: var(--gradient-secondary);
  border-radius: var(--radius-full);
  animation: logoUnderline 2s ease-out infinite alternate;
}

@keyframes logoUnderline {
  0% {
    width: 40%;
    opacity: 0.7;
  }
  100% {
    width: 70%;
    opacity: 1;
  }
}

.institution {
  font-size: var(--font-size-md);
  opacity: 0.9;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-top: var(--space-4);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-32);
}

.progress-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-12);
  font-size: var(--font-size-sm);
  background: var(--glass-bg);
  padding: var(--space-12) var(--space-20);
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  font-weight: var(--font-weight-medium);
}

.progress-bar {
  width: 140px;
  height: 10px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-secondary);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--ease-standard);
  width: 0%;
  position: relative;
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.5);
}

.progress-fill::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.4),
    transparent
  );
  animation: shimmer 2s infinite;
  border-radius: var(--radius-full);
}

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

/* Sidebar Styles - Modernized */
.sidebar {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-right: 1px solid var(--glass-border);
  padding: var(--space-32) 0;
  position: sticky;
  top: 88px;
  height: fit-content;
  max-height: calc(100vh - 88px);
  overflow-y: auto;
  transition: transform var(--duration-normal) var(--ease-standard),
    opacity var(--duration-normal) var(--ease-standard);
  box-shadow: var(--shadow-soft);
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) transparent;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

.search-container {
  padding: 0 var(--space-24);
  margin-bottom: var(--space-20);
}

.search-input {
  font-size: var(--font-size-sm);
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  transition: all var(--duration-normal) var(--ease-standard);
  padding-left: var(--space-16);
}

.search-input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
  transform: scale(1.02);
  box-shadow: 0 0 0 3px rgba(var(--color-teal-500-rgb), 0.1);
}

.study-mode-container {
  padding: 0 var(--space-24);
  margin-bottom: var(--space-24);
  text-align: center;
}

#studyModeToggle {
  width: 100%;
  justify-content: center;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

#studyModeToggle::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

#studyModeToggle:hover::before {
  left: 100%;
}

#studyModeToggle:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
  border-color: var(--color-primary);
}

.sidebar-content h3 {
  padding: 0 var(--space-24);
  margin-bottom: var(--space-20);
  font-size: var(--font-size-xl);
  color: var(--color-text);
  font-weight: var(--font-weight-bold);
  position: relative;
}

.sidebar-content h3::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: var(--space-24);
  width: 40px;
  height: 3px;
  background: var(--gradient-secondary);
  border-radius: var(--radius-full);
}

.nav-menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item {
  margin-bottom: var(--space-6);
  padding: 0 var(--space-16);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  width: 100%;
  padding: var(--space-16) var(--space-20);
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-md);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  text-align: left;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  font-weight: var(--font-weight-medium);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-primary);
  transform: scaleY(0);
  transition: transform var(--duration-normal) var(--ease-standard);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.nav-link:hover {
  background: var(--glass-bg);
  color: var(--color-text);
  transform: translateX(8px);
  backdrop-filter: blur(10px);
}

.nav-link:hover::before {
  transform: scaleY(1);
}

.nav-link.active {
  background: var(--gradient-primary);
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
  transform: translateX(8px);
  box-shadow: var(--shadow-colored);
}

.nav-link.active::before {
  transform: scaleY(1);
  background: var(--gradient-secondary);
}

.nav-link.completed::after {
  content: "✓";
  position: absolute;
  right: var(--space-16);
  color: var(--color-success);
  font-weight: bold;
  font-size: var(--font-size-lg);
  background: rgba(var(--color-success-rgb), 0.2);
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-full);
  animation: checkmark 0.5s ease-out;
}

@keyframes checkmark {
  0% {
    transform: scale(0) rotate(0deg);
    opacity: 0;
  }
  50% {
    transform: scale(1.2) rotate(180deg);
    opacity: 0.8;
  }
  100% {
    transform: scale(1) rotate(360deg);
    opacity: 1;
  }
}

.nav-icon {
  font-size: var(--font-size-xl);
  min-width: 28px;
  transition: transform var(--duration-fast) var(--ease-standard);
}

.nav-link:hover .nav-icon {
  transform: scale(1.1) rotate(5deg);
}

.nav-link.active .nav-icon {
  transform: scale(1.1);
  filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.5));
}

.module-progress {
  font-size: var(--font-size-xs);
  opacity: 0.8;
  margin-top: var(--space-4);
}

/* Content Styles */
.content {
  padding: var(--space-32) var(--space-24);
  overflow-y: auto;
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  margin-bottom: var(--space-20);
  padding: var(--space-8) 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb-item:not(:last-child)::after {
  content: "→";
  margin-left: var(--space-8);
  opacity: 0.6;
}

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

.breadcrumb-link:hover {
  color: var(--color-primary-hover);
}

/* Module Navigation */
.module-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-32);
  padding: var(--space-16) 0;
  border-bottom: 1px solid var(--color-border);
}

.module-nav-btn {
  min-width: 120px;
}

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

.module-indicator {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Module Content - Modernized */
.module-content {
  max-width: 900px;
  animation: fadeInUp var(--duration-normal) var(--ease-standard);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.module-header {
  text-align: center;
  margin-bottom: var(--space-40);
  position: relative;
  padding: var(--space-32) 0;
}

.module-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: var(--gradient-secondary);
  border-radius: var(--radius-full);
  opacity: 0.8;
}

.module-title {
  background: var(--gradient-primary);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-12);
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  position: relative;
}

.module-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  opacity: 0.9;
}

.section-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-32);
  margin-bottom: var(--space-32);
  position: relative;
  transition: all var(--duration-normal) var(--ease-standard);
  overflow: hidden;
}

.section-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-secondary);
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--ease-standard);
  transform-origin: left;
}

.section-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-strong);
  border-color: rgba(var(--color-teal-500-rgb), 0.3);
}

.section-card:hover::before {
  transform: scaleX(1);
}

.section-card .bookmark-btn {
  position: absolute;
  top: var(--space-20);
  right: var(--space-20);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  font-size: var(--font-size-xl);
  cursor: pointer;
  opacity: 0.6;
  transition: all var(--duration-normal) var(--ease-standard);
  border-radius: var(--radius-full);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
}

.section-card .bookmark-btn:hover {
  opacity: 1;
  transform: scale(1.1);
  box-shadow: var(--shadow-medium);
}

.section-card .bookmark-btn.bookmarked {
  opacity: 1;
  color: var(--color-brand-secondary);
  background: rgba(var(--color-orange-500-rgb), 0.15);
  border-color: var(--color-brand-secondary);
  animation: bookmarkPulse 2s infinite;
}

@keyframes bookmarkPulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 107, 53, 0.4);
  }
}

.section-title {
  color: var(--color-text);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-20);
  display: flex;
  align-items: center;
  gap: var(--space-16);
  font-weight: var(--font-weight-bold);
  position: relative;
}

.section-icon {
  font-size: var(--font-size-4xl);
  background: var(--gradient-accent);
  padding: var(--space-12);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 60px;
  min-height: 60px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--duration-fast) var(--ease-standard);
}

.section-card:hover .section-icon {
  transform: rotate(5deg) scale(1.05);
}

/* Enhanced Tables */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-24) 0;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-16) var(--space-20);
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.comparison-table th {
  background: var(--gradient-primary);
  color: var(--color-white);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: var(--font-size-sm);
}

.comparison-table tr {
  transition: all var(--duration-fast) var(--ease-standard);
}

.comparison-table tr:hover {
  background: rgba(var(--color-teal-500-rgb), 0.05);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

/* Code Styles - Enhanced */
.code-container {
  margin: var(--space-24) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--gradient-primary);
  padding: var(--space-16) var(--space-24);
  border-bottom: none;
  position: relative;
}

.code-header::before {
  content: "";
  position: absolute;
  top: var(--space-8);
  left: var(--space-16);
  width: 12px;
  height: 12px;
  background: #ff5f57;
  border-radius: 50%;
  box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #28ca42;
}

.code-title {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-md);
  color: var(--color-white);
  margin-left: var(--space-32);
}

.toggle-code {
  font-size: var(--font-size-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--color-white);
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

.toggle-code::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

.toggle-code:hover::before {
  left: 100%;
}

.toggle-code:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-1px);
}

.code-content {
  border-radius: 0;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-standard);
}

.code-content.hidden {
  display: none;
}

.code-content pre {
  margin: 0;
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%) !important;
  border: none;
  font-size: var(--font-size-sm);
  line-height: 1.6;
  padding: var(--space-24) !important;
  position: relative;
}

.code-content pre::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-secondary);
}

/* Code syntax highlighting improvements */
.code-content pre code {
  color: #e6db74 !important;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.3);
}

/* Animated Feature Boxes */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-24);
  margin: var(--space-32) 0;
}

.feature-box {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  padding: var(--space-24);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--glass-border);
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

.feature-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  transition: left 0.7s ease;
}

.feature-box:hover::before {
  left: 100%;
}

.feature-box:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-medium);
  border-color: rgba(var(--color-teal-500-rgb), 0.3);
}

.feature-icon {
  font-size: 3.5rem;
  margin-bottom: var(--space-16);
  background: var(--gradient-accent);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: transform var(--duration-normal) var(--ease-standard);
}

.feature-box:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-12);
  color: var(--color-text);
  position: relative;
}

.feature-title::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 30px;
  height: 2px;
  background: var(--gradient-secondary);
  border-radius: var(--radius-full);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.feature-box:hover .feature-title::after {
  transform: translateX(-50%) scaleX(1);
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalSlideIn var(--duration-normal) var(--ease-standard);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-20);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  margin: 0;
  color: var(--color-brand-primary);
}

.modal-body {
  padding: var(--space-20);
}

.modal-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-12);
  padding: var(--space-20);
  border-top: 1px solid var(--color-border);
}

.quiz-progress {
  flex: 1;
  height: 8px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-right: var(--space-16);
}

.quiz-progress-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--ease-standard);
  width: 0%;
}

.quiz-question {
  margin-bottom: var(--space-20);
}

.quiz-question h4 {
  color: var(--color-text);
  margin-bottom: var(--space-12);
}

.quiz-options {
  list-style: none;
  padding: 0;
  margin: 0;
}

.quiz-option {
  margin-bottom: var(--space-8);
  position: relative;
}

.quiz-option label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  padding: var(--space-12);
  border-radius: var(--radius-base);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-standard);
  border: 2px solid transparent;
  background: var(--color-surface);
}

.quiz-option label:hover {
  background: var(--color-secondary);
  border-color: var(--color-border);
}

/* Quiz Feedback Styles */
.quiz-option.correct-answer label {
  background: var(--color-bg-3);
  border-color: var(--color-success);
  color: var(--color-success);
  cursor: default;
}

.quiz-option.incorrect-answer label {
  background: var(--color-bg-4);
  border-color: var(--color-error);
  color: var(--color-error);
  cursor: default;
}

.quiz-option.disabled-option label {
  opacity: 0.6;
  cursor: default;
}

.quiz-option.disabled-option label:hover {
  background: var(--color-surface);
  border-color: transparent;
}

.option-text {
  flex: 1;
}

.option-feedback {
  margin-left: var(--space-8);
}

.feedback-icon {
  font-size: var(--font-size-lg);
  font-weight: bold;
}

/* Question Explanation */
.question-explanation {
  margin-top: var(--space-20);
  padding: var(--space-16);
  background: var(--color-bg-1);
  border-radius: var(--radius-base);
  border-left: 4px solid var(--color-primary);
  animation: slideDown var(--duration-normal) var(--ease-standard);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 200px;
  }
}

.explanation-content h5 {
  margin: 0 0 var(--space-8) 0;
  color: var(--color-primary);
  font-size: var(--font-size-md);
}

.explanation-content p {
  margin: 0;
  line-height: var(--line-height-normal);
}

.success-message {
  color: var(--color-success);
  font-weight: var(--font-weight-semibold);
}

.error-message {
  color: var(--color-error);
  font-weight: var(--font-weight-semibold);
}

/* Selection Reminder */
.selection-reminder {
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

/* Button States */
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background: var(--color-secondary);
}

.quiz-option input[type="radio"] {
  margin: 0;
}

.quiz-result {
  text-align: center;
  padding: var(--space-20);
}

.quiz-score {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-16);
}

.quiz-score.excellent {
  color: var(--color-success);
}

.quiz-score.good {
  color: var(--color-brand-secondary);
}

.quiz-score.needs-improvement {
  color: var(--color-warning);
}

/* Feature Boxes */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-20);
  margin: var(--space-24) 0;
}

.feature-box {
  background: var(--color-bg-3);
  padding: var(--space-20);
  border-radius: var(--radius-base);
  text-align: center;
}

.feature-icon {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-12);
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-8);
  color: var(--color-text);
}

/* Footer */
.footer {
  background: var(--color-bg-1);
  border-top: 1px solid var(--color-border);
  padding: var(--space-20) 0;
  text-align: center;
}

.footer-content p {
  margin: var(--space-4) 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Theme Toggle Styles */
#themeToggle {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
}

#themeToggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: var(--space-16);
  }

  .header-actions {
    flex-direction: column;
    gap: var(--space-12);
  }

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

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

  .features-grid {
    grid-template-columns: 1fr;
  }

  .comparison-table {
    font-size: var(--font-size-sm);
  }

  .comparison-table th,
  .comparison-table td {
    padding: var(--space-8) var(--space-12);
  }

  .module-navigation {
    flex-direction: column;
    gap: var(--space-12);
  }

  .module-nav-btn {
    width: 100%;
    min-width: auto;
  }

  .search-container {
    padding: 0 var(--space-16);
  }

  .study-mode-container {
    padding: 0 var(--space-16);
  }
}

@media (max-width: 480px) {
  .modal-content {
    width: 95%;
    margin: var(--space-16);
  }

  .modal-footer {
    flex-direction: column;
  }

  .quiz-progress {
    margin-right: 0;
    margin-bottom: var(--space-12);
  }
}

/* Animation and Transitions */
.module-content {
  animation: fadeIn var(--duration-normal) var(--ease-standard);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideOutRight {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* Toast Notifications */
.completion-toast {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1001;
}

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

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

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

/* Accessibility Enhancements */
.nav-link:focus-visible,
.toggle-code:focus-visible,
.search-input:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

/* Skip to content link for screen readers */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1000;
}

.skip-to-content:focus {
  top: 6px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border: var(--color-black);
    --color-primary: #0066cc;
    --color-text: var(--color-black);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .modal-content {
    animation: none;
  }
}

/* Search highlight styles */
.search-highlight {
  background: var(--color-brand-secondary);
  color: var(--color-white);
  padding: 2px 4px;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-medium);
}

/* Print Styles */
@media print {
  .sidebar,
  .header,
  .footer,
  .quiz-trigger,
  .toggle-code {
    display: none;
  }

  .main-container {
    grid-template-columns: 1fr;
  }

  .code-content {
    display: block !important;
  }
}

/* ========================================
   MODERN ENHANCEMENTS & IMPROVEMENTS
   ======================================== */

/* Enhanced Theme Toggle */
#themeToggle {
  border-color: rgba(255, 255, 255, 0.3);
  color: var(--color-white);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  transition: all var(--duration-normal) var(--ease-standard);
  position: relative;
  overflow: hidden;
}

#themeToggle::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

#themeToggle:hover::before {
  left: 100%;
}

#themeToggle:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.5);
  transform: scale(1.05);
}

/* Enhanced Buttons with Modern Effects */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-12) var(--space-20);
  border-radius: var(--radius-md);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-standard);
  border: none;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  background-clip: padding-box;
}

.btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.6s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn--primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-soft);
}

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

.btn--secondary {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--color-text);
  border: 1px solid var(--glass-border);
}

.btn--secondary:hover {
  background: rgba(var(--color-teal-500-rgb), 0.1);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

/* Modern Scrollbar Styling */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary) transparent;
}

*::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: background var(--duration-fast) var(--ease-standard);
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-hover);
}

/* Enhanced Content Layout */
.content {
  padding: var(--space-40) var(--space-32);
  overflow-y: auto;
  background: linear-gradient(
    135deg,
    rgba(var(--color-teal-500-rgb), 0.02) 0%,
    transparent 50%,
    rgba(var(--color-orange-500-rgb), 0.02) 100%
  );
}

/* Modern Breadcrumb */
.breadcrumb-nav {
  margin-bottom: var(--space-24);
  padding: var(--space-12) var(--space-20);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-full);
  border: 1px solid var(--glass-border);
  display: inline-block;
}

/* Enhanced Module Navigation */
.module-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-40);
  padding: var(--space-20) 0;
  border-bottom: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: var(--space-20) var(--space-32);
}

.module-nav-btn {
  min-width: 140px;
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  position: relative;
}

.module-nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--color-secondary);
  color: var(--color-text-secondary);
}

.module-nav-btn:not(:disabled):hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-colored);
}

/* Enhanced Toast Notifications */
.completion-toast {
  position: fixed;
  top: 100px;
  right: var(--space-24);
  z-index: 1001;
  animation: toastSlideIn var(--duration-normal) var(--ease-standard);
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%) scale(0.8);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

.toast-content {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  background: var(--glass-bg);
  backdrop-filter: blur(30px);
  padding: var(--space-16) var(--space-24);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-strong);
}

/* Floating Action Button for Study Mode */
.floating-study-btn {
  position: fixed;
  bottom: var(--space-24);
  right: var(--space-24);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--gradient-secondary);
  color: var(--color-white);
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  z-index: 999;
  transition: all var(--duration-normal) var(--ease-standard);
  box-shadow: var(--shadow-medium);
  backdrop-filter: blur(10px);
}

.floating-study-btn:hover {
  transform: scale(1.1) rotate(5deg);
  box-shadow: var(--shadow-strong);
}

/* Enhanced Dark Mode Support */
[data-color-scheme="dark"] {
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.15);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

/* Better Focus States */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Improved Animation Performance */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High Contrast Mode Improvements */
@media (prefers-contrast: high) {
  :root {
    --glass-bg: rgba(255, 255, 255, 0.95);
    --glass-border: rgba(0, 0, 0, 0.8);
  }

  [data-color-scheme="dark"] {
    --glass-bg: rgba(0, 0, 0, 0.95);
    --glass-border: rgba(255, 255, 255, 0.8);
  }
}

/* ========================================
   BACKGROUND DECORATIONS & ANIMATIONS
   ======================================== */

/* Floating Background Decorations */
.bg-decoration {
  position: fixed;
  border-radius: 50%;
  opacity: 0.1;
  pointer-events: none;
  z-index: -1;
  animation: float 20s infinite ease-in-out;
}

.bg-decoration--1 {
  width: 300px;
  height: 300px;
  background: var(--gradient-primary);
  top: 10%;
  right: -150px;
  animation-delay: 0s;
}

.bg-decoration--2 {
  width: 200px;
  height: 200px;
  background: var(--gradient-secondary);
  bottom: 20%;
  left: -100px;
  animation-delay: -7s;
}

.bg-decoration--3 {
  width: 150px;
  height: 150px;
  background: var(--gradient-accent);
  top: 60%;
  right: 10%;
  animation-delay: -14s;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px) rotate(0deg) scale(1);
    opacity: 0.1;
  }
  25% {
    transform: translateY(-20px) rotate(90deg) scale(1.1);
    opacity: 0.15;
  }
  50% {
    transform: translateY(-40px) rotate(180deg) scale(0.9);
    opacity: 0.08;
  }
  75% {
    transform: translateY(-20px) rotate(270deg) scale(1.05);
    opacity: 0.12;
  }
}

/* Enhanced Body Background */
body {
  margin: 0;
  padding: 0;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 20% 50%,
      rgba(var(--color-teal-500-rgb), 0.03) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(var(--color-orange-500-rgb), 0.03) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 80%,
      rgba(var(--color-accent-purple), 0.03) 0%,
      transparent 50%
    );
  pointer-events: none;
  z-index: -2;
}

/* ========================================
   MODERN COMPONENT ENHANCEMENTS
   ======================================== */

/* Enhanced Footer */
.footer {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-24) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(var(--color-teal-500-rgb), 0.05),
    transparent
  );
  animation: footerShimmer 8s infinite;
}

@keyframes footerShimmer {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

.footer-content p {
  margin: var(--space-6) 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* Interactive Hover States */
.section-card,
.feature-box,
.code-container,
.comparison-table {
  will-change: transform;
}

/* Smooth Transitions for All Interactive Elements */
.nav-link,
.btn,
.quiz-option label,
.toggle-code,
.section-card,
.feature-box {
  will-change: transform, box-shadow;
}

/* Loading Animation for Content */
.module-content.loading {
  opacity: 0.6;
  pointer-events: none;
}

.module-content.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  border: 3px solid rgba(var(--color-teal-500-rgb), 0.3);
  border-top: 3px solid var(--color-primary);
  border-radius: 50%;
  animation: loading 1s linear infinite;
  transform: translate(-50%, -50%);
}

@keyframes loading {
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

/* Particle Effect on Active Elements */
.nav-link.active::after {
  content: "✨";
  position: absolute;
  right: var(--space-8);
  animation: sparkle 2s infinite;
}

@keyframes sparkle {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.2);
  }
}

/* Enhanced Focus Ring with Animation */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
  animation: focusPulse 2s infinite;
}

@keyframes focusPulse {
  0%,
  100% {
    outline-color: var(--color-primary);
  }
  50% {
    outline-color: rgba(var(--color-teal-500-rgb), 0.5);
  }
}

/* Modernized Typography with Text Gradients */
h1,
h2,
.module-title {
  background: linear-gradient(
    135deg,
    var(--color-text) 0%,
    rgba(var(--color-teal-500-rgb), 0.8) 100%
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: var(--font-weight-bold);
}

/* Responsive Enhancements */
@media (max-width: 768px) {
  .bg-decoration {
    display: none;
  }

  .content {
    padding: var(--space-20) var(--space-16);
  }

  .section-card {
    padding: var(--space-20);
  }

  .modal-content {
    width: 95%;
    margin: var(--space-12);
  }
}