/*
 * CONTENT SPLITTING GUIDE:
 * 
 * For slides that don't fit, use these classes on your slide-content div:
 * 
 * 1. .auto-split - Makes content scrollable and left-aligned
 * 2. .two-column - Splits content into 2 columns
 * 3. .three-column - Splits content into 3 columns
 * 4. .wide-slide-content - Wider container (1400px)
 * 5. .extra-wide-slide-content - Extra wide container (1600px)
 * 
 * For long lists, add .long-list class to <ul> or <ol> elements
 * 
 * Example: <div class="slide-content auto-split">...</div>
 * Example: <div class="slide-content two-column">...</div>
 * Example: <ul class="long-list">...</ul>
 */

: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-cream-50);
    --color-surface: var(--color-cream-100);
    --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-cream-50);
  --color-surface: var(--color-cream-100);
  --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 */
:root {
  /* Use design system colors and remove custom color palette */
  
  /* Semantic Color Assignments - Updated to match design system */
  --color-primary: var(--color-teal-500);
  --color-primary-light: var(--color-teal-400);
  --color-primary-dark: var(--color-teal-600);
  --color-secondary: var(--color-primary);
  --color-accent: var(--color-orange-500);
  --color-success: var(--color-teal-500);
  --color-warning: var(--color-orange-500);
  --color-error: var(--color-red-500);
  --color-info: var(--color-slate-500);

  /* Background Colors - Using design system */
  --color-background: var(--color-background);
  --color-surface: var(--color-surface);
  --color-surface-secondary: var(--color-secondary);

  /* Text Colors - Using design system */
  --color-text-primary: var(--color-text);
  --color-text-secondary: var(--color-text-secondary);
  --color-text-tertiary: var(--color-text-secondary);
  --color-text-inverse: var(--color-cream-50);

  /* Border Colors - Using design system */
  --color-border-light: var(--color-border);
  --color-border-medium: var(--color-border);
  --color-border-dark: var(--color-border);

  /* Typography System - Using design system */
  --font-family-sans: var(--font-family-base);
  --font-family-mono: var(--font-family-mono);
  --font-family-serif: "Playfair Display", Georgia, "Times New Roman", serif;

  /* Font Weights - Using design system */
  --font-weight-light: 300;
  --font-weight-normal: var(--font-weight-normal);
  --font-weight-medium: var(--font-weight-medium);
  --font-weight-semibold: var(--font-weight-semibold);
  --font-weight-bold: var(--font-weight-bold);
  --font-weight-extrabold: 800;

  /* Font Sizes - Updated to match design system px values */
  --font-size-xs: var(--font-size-xs);
  --font-size-sm: var(--font-size-sm);
  --font-size-base: var(--font-size-base);
  --font-size-lg: var(--font-size-lg);
  --font-size-xl: var(--font-size-xl);
  --font-size-2xl: var(--font-size-2xl);
  --font-size-3xl: var(--font-size-3xl);
  --font-size-4xl: var(--font-size-4xl);
  --font-size-5xl: 48px;
  --font-size-6xl: 60px;
  --font-size-7xl: 72px;

  /* Line Heights - Using design system */
  --line-height-tight: var(--line-height-tight);
  --line-height-snug: 1.375;
  --line-height-normal: var(--line-height-normal);
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;

  /* Spacing Scale - Updated to match design system */
  --spacing-0: var(--space-0);
  --spacing-px: var(--space-1);
  --spacing-1: var(--space-4);
  --spacing-2: var(--space-8);
  --spacing-3: var(--space-12);
  --spacing-4: var(--space-16);
  --spacing-5: var(--space-20);
  --spacing-6: var(--space-24);
  --spacing-8: var(--space-32);
  --spacing-10: 40px;
  --spacing-12: 48px;
  --spacing-16: 64px;
  --spacing-20: 80px;
  --spacing-24: 96px;
  --spacing-32: 128px;
  --spacing-40: 160px;
  --spacing-48: 192px;
  --spacing-56: 224px;
  --spacing-64: 256px;

  /* Border Radius - Using design system */
  --border-radius-none: 0;
  --border-radius-sm: var(--radius-sm);
  --border-radius-base: var(--radius-base);
  --border-radius-md: var(--radius-md);
  --border-radius-lg: var(--radius-lg);
  --border-radius-xl: var(--radius-lg);
  --border-radius-2xl: var(--radius-lg);
  --border-radius-3xl: var(--radius-lg);
  --border-radius-full: var(--radius-full);

  /* Shadows - Using design system */
  --shadow-sm: var(--shadow-xs);
  --shadow-base: var(--shadow-sm);
  --shadow-md: var(--shadow-md);
  --shadow-lg: var(--shadow-lg);
  --shadow-xl: var(--shadow-lg);
  --shadow-2xl: var(--shadow-lg);
  --shadow-inner: var(--shadow-inset-sm);

  /* Animations - Using design system */
  --transition-none: none;
  --transition-all: all var(--duration-fast) var(--ease-standard);
  --transition-fast: all var(--duration-fast) var(--ease-standard);
  --transition-normal: all var(--duration-fast) var(--ease-standard);
  --transition-medium: all var(--duration-normal) var(--ease-standard);
  --transition-slow: all 300ms var(--ease-standard);

  /* Z-Index Scale */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal-backdrop: 1040;
  --z-index-modal: 1050;
  --z-index-popover: 1060;
  --z-index-tooltip: 1070;
  --z-index-toast: 1080;

  /* Breakpoints - Using design system */
  --breakpoint-sm: var(--container-sm);
  --breakpoint-md: var(--container-md);
  --breakpoint-lg: var(--container-lg);
  --breakpoint-xl: var(--container-xl);
  --breakpoint-2xl: 1536px;
}

/* Reset and Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  line-height: var(--line-height-normal);
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: var(--font-family-base);
  color: var(--color-text);
  background-color: var(--color-background);
}

body {
  font-family: var(--font-family-sans);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  overflow: hidden;
  height: 100vh;
  margin: 0;
}

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

h1 {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
}

h2 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-snug);
}

h3 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h5 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
}

h6 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

p {
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-4);
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition-normal);
}

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

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

/* Lists */
ul, ol {
  padding-left: var(--spacing-6);
  margin-bottom: var(--spacing-4);
}

li {
  margin-bottom: var(--spacing-2);
  line-height: var(--line-height-relaxed);
}

/* Presentation Container */
.presentation-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
  overflow: hidden;
  font-family: var(--font-family-sans);
}

.presentation-container.fullscreen {
  background: var(--color-background) !important;
}

/* Force light background for fullscreen mode */
.presentation-container.fullscreen,
.presentation-container.fullscreen body {
  background: var(--color-cream-50) !important;
}

/* Navigation Controls */
.nav-controls {
  position: fixed;
  top: var(--spacing-6);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-index-fixed);
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--border-radius-3xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  transition: var(--transition-medium);
}

.nav-controls:hover {
  box-shadow: var(--shadow-lg);
}

.slide-counter {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  min-width: 80px;
  text-align: center;
  font-family: var(--font-family-mono);
}

/* Timer Display */
.timer-display {
  position: fixed;
  top: var(--spacing-6);
  right: var(--spacing-6);
  z-index: var(--z-index-fixed);
  background: linear-gradient(135deg, var(--color-warning), var(--color-orange-600));
  color: white;
  padding: var(--spacing-3) var(--spacing-5);
  border-radius: var(--border-radius-2xl);
  font-weight: var(--font-weight-semibold);
  font-family: var(--font-family-mono);
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(-20px) scale(0.9);
  transition: var(--transition-medium);
}

.timer-display.active {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.timer-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

/* Fullscreen Button */
.fullscreen-btn {
  position: fixed;
  top: var(--spacing-6);
  left: var(--spacing-6);
  z-index: var(--z-index-fixed);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-2);
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
  color: var(--color-text-primary);
}

.fullscreen-btn:hover {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  border-color: var(--color-primary);
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.fullscreen-btn:active {
  transform: scale(0.95);
}

/* Slide Styles */
.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateX(50px);
  transition: var(--transition-medium);
  padding: var(--spacing-12);
}

.slide.active {
  opacity: 1;
  transform: translateX(0);
}

/* Slide Content */
.slide-content {
  max-width: 1200px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  text-align: center;
  position: relative;
  overflow-y: auto;
  padding: var(--space-16);
  gap: var(--space-16);
}

.slide-content.wide-slide-content {
  max-width: 1400px;
}

.slide-content.extra-wide-slide-content {
  max-width: 1600px;
}

/* Auto-split content when too long */
.slide-content.auto-split {
  max-height: 85vh;
  justify-content: flex-start;
  align-items: flex-start;
  text-align: left;
  overflow-y: auto;
  padding: var(--space-24);
}

.slide-content.auto-split h1,
.slide-content.auto-split h2,
.slide-content.auto-split h3 {
  text-align: center;
  width: 100%;
  margin-bottom: var(--space-24);
}

/* Split content into columns for better fit */
.slide-content.two-column {
  flex-direction: row;
  gap: var(--space-32);
  align-items: flex-start;
  text-align: left;
  max-height: 85vh;
}

.slide-content.two-column > * {
  flex: 1;
  max-height: 100%;
  overflow-y: auto;
}

/* Three column layout for dense content */
.slide-content.three-column {
  flex-direction: row;
  gap: var(--space-24);
  align-items: flex-start;
  text-align: left;
  max-height: 85vh;
}

.slide-content.three-column > * {
  flex: 1;
  max-height: 100%;
  overflow-y: auto;
}

/* Scrollable content styling */
.slide-content::-webkit-scrollbar,
.slide-content.two-column > *::-webkit-scrollbar,
.slide-content.three-column > *::-webkit-scrollbar {
  width: 8px;
}

.slide-content::-webkit-scrollbar-track,
.slide-content.two-column > *::-webkit-scrollbar-track,
.slide-content.three-column > *::-webkit-scrollbar-track {
  background: var(--color-secondary);
  border-radius: var(--radius-sm);
}

.slide-content::-webkit-scrollbar-thumb,
.slide-content.two-column > *::-webkit-scrollbar-thumb,
.slide-content.three-column > *::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-sm);
}

.slide-content::-webkit-scrollbar-thumb:hover,
.slide-content.two-column > *::-webkit-scrollbar-thumb:hover,
.slide-content.three-column > *::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-hover);
}

/* Auto-split content when too long */
.slide-content.auto-split {
  max-height: 85vh;
  justify-content: flex-start;
  align-items: flex-start;
  text-align: left;
  overflow-y: auto;
  padding: var(--space-24);
}

.slide-content.auto-split h1,
.slide-content.auto-split h2,
.slide-content.auto-split h3 {
  text-align: center;
  width: 100%;
  margin-bottom: var(--space-24);
}

/* Split content into columns for better fit */
.slide-content.two-column {
  flex-direction: row;
  gap: var(--space-32);
  align-items: flex-start;
  text-align: left;
}

.slide-content.two-column > * {
  flex: 1;
}

/* Scrollable content indicator */
.slide-content::-webkit-scrollbar {
  width: 8px;
}

.slide-content::-webkit-scrollbar-track {
  background: var(--color-secondary);
  border-radius: var(--radius-sm);
}

.slide-content::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-sm);
}

.slide-content::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-hover);
}

/* Title Slide */
.title-slide {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-teal-700) 100%);
  color: var(--color-btn-primary-text);
  border-radius: var(--border-radius-3xl);
  padding: var(--spacing-16);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.title-slide::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
  opacity: 0.3;
}

.title-slide > * {
  position: relative;
  z-index: 1;
}

.main-title {
  font-size: var(--font-size-7xl);
  font-weight: var(--font-weight-extrabold);
  margin-bottom: var(--spacing-6);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
  background: linear-gradient(45deg, rgba(255,255,255,1), rgba(255,255,255,0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-normal);
  margin-bottom: var(--spacing-12);
  opacity: 0.9;
  font-style: italic;
}

.presenter-info {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-loose);
}

.presenter {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-2);
}

.affiliation, .date {
  opacity: 0.8;
  font-weight: var(--font-weight-normal);
}

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border-radius: var(--border-radius-lg);
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-fast);
  font-family: var(--font-family-sans);
  position: relative;
  overflow: hidden;
  min-width: 120px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.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: var(--transition-medium);
}

.btn:hover:not(:disabled)::before {
  left: 100%;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-btn-primary-text);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.btn--primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--color-primary-hover);
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--color-secondary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover:not(:disabled) {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
}

/* Chapter Sections */
.chapter-sections {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-6);
  width: 100%;
  margin-top: var(--spacing-8);
}

.section-card {
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-background) 100%);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  text-align: left;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  transition: var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.section-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
  transition: var(--transition-medium);
}

.section-card:hover {
  transform: translateY(-4px) rotate(0.5deg);
  box-shadow: var(--shadow-lg);
}

.section-card:hover::before {
  width: 8px;
}

.section-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-xl);
}

.section-card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* Objectives Grid */
.objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-6);
  width: 100%;
  margin-top: var(--spacing-8);
}

.objective-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  text-align: center;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  transition: var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.objective-card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(var(--color-teal-500-rgb), 0.05) 0%, transparent 70%);
  opacity: 0;
  transition: var(--transition-medium);
}

.objective-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.objective-card:hover::after {
  opacity: 1;
}

.objective-icon {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-4);
  position: relative;
  z-index: 1;
}

.objective-card h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
  position: relative;
  z-index: 1;
}

.objective-card p {
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
  position: relative;
  z-index: 1;
}

/* Case Study Styles */
.case-study-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.case-background {
  background: linear-gradient(135deg, var(--color-bg-1) 0%, rgba(var(--color-teal-500-rgb), 0.08) 100%);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-primary);
}

.data-preview {
  background: linear-gradient(135deg, var(--color-bg-3) 0%, rgba(var(--color-teal-500-rgb), 0.08) 100%);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-success);
}

.methodology-box {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  margin-top: var(--spacing-6);
  box-shadow: var(--shadow-sm);
}

.rich-list {
  margin-top: var(--spacing-4);
}

.rich-person {
  background: var(--color-surface);
  padding: var(--spacing-4);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-3);
  box-shadow: var(--shadow-sm);
  font-weight: var(--font-weight-medium);
  border-left: 3px solid var(--color-success);
}

/* Data Classification Tree */
.data-classification {
  width: 100%;
  text-align: left;
}

.classification-tree {
  margin-top: var(--spacing-8);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tree-root {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-btn-primary-text);
  padding: var(--spacing-6) var(--spacing-8);
  border-radius: var(--border-radius-2xl);
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--spacing-8);
  text-align: center;
}

.tree-branches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-8);
  width: 100%;
  max-width: 1000px;
}

.branch {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-card-border);
  position: relative;
}

.branch::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 20px;
  background: var(--color-border);
}

.qualitative-branch {
  border-color: rgba(var(--color-teal-500-rgb), 0.3);
}

.qualitative-branch h4 {
  color: var(--color-primary);
}

.quantitative-branch {
  border-color: rgba(var(--color-teal-500-rgb), 0.3);
}

.quantitative-branch h4 {
  color: var(--color-success);
}

.sub-branches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.sub-branch {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
}

.discrete-branch {
  border-left: 3px solid var(--color-info);
}

.discrete-branch h5 {
  color: var(--color-info);
}

.continuous-branch {
  border-left: 3px solid var(--color-warning);
}

.continuous-branch h5 {
  color: var(--color-warning);
}

.examples {
  margin-top: var(--spacing-3);
}

.examples span {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  display: block;
  margin-bottom: var(--spacing-2);
}

.examples ul {
  margin: 0;
  padding-left: var(--spacing-4);
}

.examples li {
  margin-bottom: var(--spacing-1);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Classification Exercise */
.classification-exercise {
  width: 100%;
  text-align: left;
}

.exercise-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
  margin: var(--spacing-8) 0;
}

.classification-item {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
}

.classification-item p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-4);
  color: var(--color-text-primary);
}

.classification-options {
  display: flex;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-4);
  flex-wrap: wrap;
}

.classify-btn {
  background: var(--color-secondary);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-3) var(--spacing-5);
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

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

.classify-btn.correct {
  background: var(--color-success);
  color: var(--color-btn-primary-text);
  border-color: var(--color-success);
}

.classify-btn.incorrect {
  background: var(--color-error);
  color: var(--color-btn-primary-text);
  border-color: var(--color-error);
}

.feedback {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  margin-top: var(--spacing-4);
  border-left: 4px solid var(--color-info);
}

.feedback.hidden {
  display: none;
}

.check-all-btn {
  margin-top: var(--spacing-6);
  display: block;
  margin-left: auto;
  margin-right: auto;
}

/* Definition and Theory Boxes */
.definition-box {
  background: linear-gradient(135deg, var(--color-bg-1) 0%, var(--color-surface) 100%);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 5px solid var(--color-info);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-6);
}

.definition-box h3 {
  color: var(--color-info);
  margin-bottom: var(--spacing-4);
}

.example-demonstration {
  width: 100%;
}

/* Tables */
.data-table {
  width: 100%;
  margin: var(--spacing-6) 0;
}

.frequency-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.frequency-table th {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: var(--color-btn-primary-text);
  padding: var(--spacing-4) var(--spacing-6);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
}

.frequency-table td {
  padding: var(--spacing-4) var(--spacing-6);
  border-bottom: 1px solid var(--color-card-border);
  color: var(--color-text-primary);
}

.frequency-table tr:nth-child(even) {
  background: var(--color-background);
}

.frequency-table tr:hover {
  background: var(--color-bg-1);
}

.total-row {
  background: var(--color-secondary) !important;
  font-weight: var(--font-weight-semibold);
}

.formula-box {
  background: var(--color-bg-2);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  margin-top: var(--spacing-6);
  text-align: center;
}

.formula-box h4 {
  color: var(--color-warning);
  margin-bottom: var(--spacing-4);
}

/* Chart Containers */
.chart-container {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  margin: var(--spacing-6) 0;
  position: relative;
  overflow: hidden;
}

.chart-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary), var(--color-accent));
}

.chart-controls {
  display: flex;
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
  flex-wrap: wrap;
  justify-content: center;
}

.bin-control {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  background: var(--color-secondary);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-card-border);
}

.bin-control label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.bin-control input[type="range"] {
  width: 120px;
}

.bin-control span {
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  min-width: 20px;
  text-align: center;
  font-family: var(--font-family-mono);
}

/* Pie Chart and Bar Chart Content */
.pie-chart-content,
.bar-chart-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.definition-explanation {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.construction-steps {
  background: var(--color-bg-3);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-success);
}

.construction-steps h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-4);
}

.construction-steps ol {
  margin: 0;
  padding-left: var(--spacing-6);
}

.construction-steps li {
  margin-bottom: var(--spacing-3);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

.pie-vs-bar {
  background: var(--color-bg-5);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-primary);
}

.pie-vs-bar h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-6);
  margin-top: var(--spacing-4);
}

.comparison-item {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  box-shadow: var(--shadow-sm);
}

.comparison-item h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

.comparison-item ul {
  margin: 0;
  padding-left: var(--spacing-4);
}

.comparison-item li {
  margin-bottom: var(--spacing-1);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Grouping Methods */
.grouping-methods {
  width: 100%;
  text-align: left;
}

.grouping-guidelines {
  margin-bottom: var(--spacing-8);
}

.guidelines-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-6);
  margin-top: var(--spacing-6);
}

.guideline-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  position: relative;
  overflow: hidden;
}

.guideline-card::before {
  content: attr(data-number);
  position: absolute;
  top: -10px;
  right: -10px;
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
}

.guideline-card h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
  padding-right: var(--spacing-8);
}

.guideline-card p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  margin: 0;
}

.method-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-6);
  margin-top: var(--spacing-6);
}

.method-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  text-align: center;
  transition: var(--transition-medium);
}

.method-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.method-card.single-value {
  border-top: 4px solid var(--color-info);
}

.method-card.single-value h4 {
  color: var(--color-info);
}

.method-card.limit {
  border-top: 4px solid var(--color-success);
}

.method-card.limit h4 {
  color: var(--color-success);
}

.method-card.cutpoint {
  border-top: 4px solid var(--color-primary);
}

.method-card.cutpoint h4 {
  color: var(--color-primary);
}

.method-card .example {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  margin-top: var(--spacing-4);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
}

/* Histogram Content */
.histogram-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.histogram-types {
  background: var(--color-bg-2);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-warning);
}

.histogram-types h3 {
  color: var(--color-warning);
  margin-bottom: var(--spacing-4);
}

.histogram-types ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.histogram-types li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-primary);
}

.data-input {
  background: var(--color-secondary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.data-input h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

.data-display {
  font-family: var(--font-family-mono);
  background: var(--color-surface);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
}

.data-values {
  font-family: var(--font-family-mono);
  background: var(--color-surface);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
}

.histogram-controls {
  display: flex;
  gap: var(--spacing-4);
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

/* Dotplot Styles */
.dotplot-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.dotplot-advantages {
  background: var(--color-bg-3);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-success);
}

.dotplot-advantages h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-4);
}

.dotplot-advantages ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.dotplot-advantages li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-primary);
}

.dotplot-container {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  margin: var(--spacing-6) 0;
  overflow: hidden;
}

.dotplot-controls {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Stem-and-Leaf Styles */
.stemleaf-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.stemleaf-display {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.stemleaf-table {
  width: 100%;
}

.stemleaf-table table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-family-mono);
}

.stemleaf-table th {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  padding: var(--spacing-3) var(--spacing-4);
  text-align: center;
  font-weight: var(--font-weight-semibold);
}

.stemleaf-table td {
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-card-border);
  text-align: center;
}

.stemleaf-table td.stem {
  background: var(--color-bg-1);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

.stemleaf-table td.separator {
  background: var(--color-background);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-bold);
}

.stemleaf-table td.leaves {
  background: var(--color-surface);
  color: var(--color-text-primary);
  text-align: left;
  font-weight: var(--font-weight-medium);
}

.stemleaf-controls {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* Distribution Shapes */
.modality-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.modality-types {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.modal-type {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  text-align: center;
}

.modal-type h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
}

.shape-diagram {
  height: 60px;
  background: var(--color-secondary);
  border-radius: var(--border-radius-lg);
  margin-top: var(--spacing-4);
  position: relative;
  overflow: hidden;
}

.unimodal-shape {
  background: linear-gradient(to right, 
    transparent 0%, 
    transparent 20%, 
    var(--color-primary) 50%, 
    transparent 80%, 
    transparent 100%
  );
}

.bimodal-shape {
  background: linear-gradient(to right, 
    transparent 0%, 
    var(--color-primary) 25%, 
    transparent 50%, 
    var(--color-primary) 75%, 
    transparent 100%
  );
}

.multimodal-shape {
  background: linear-gradient(to right, 
    transparent 0%, 
    var(--color-primary) 15%, 
    transparent 30%, 
    var(--color-primary) 50%, 
    transparent 65%, 
    var(--color-primary) 85%, 
    transparent 100%
  );
}

.interactive-modality {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
}

.shape-controls {
  display: flex;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-6);
  flex-wrap: wrap;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.control-group label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
}

.control-group select {
  padding: var(--spacing-2) var(--spacing-3);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--font-size-base);
}

.shape-display {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
}

/* Symmetry and Skewness */
.symmetry-content {
  width: 100%;
  text-align: left;
}

.symmetry-types {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-8);
}

.symmetry-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
}

.symmetry-card.symmetric {
  border-top: 4px solid var(--color-success);
}

.symmetry-card.symmetric h3 {
  color: var(--color-success);
}

.symmetry-card.skewed {
  border-top: 4px solid var(--color-warning);
}

.symmetry-card.skewed h3 {
  color: var(--color-warning);
}

.shape-examples,
.skew-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-4);
  margin-top: var(--spacing-6);
}

.shape-item,
.skew-item {
  text-align: center;
}

.shape-item h4,
.skew-item h4 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-base);
}

.mini-chart {
  height: 40px;
  background: var(--color-secondary);
  border-radius: var(--border-radius-md);
  margin-top: var(--spacing-2);
  position: relative;
  overflow: hidden;
}

.bell-chart {
  background: radial-gradient(ellipse at center bottom, var(--color-success) 20%, transparent 70%);
}

.uniform-chart {
  background: linear-gradient(to bottom, transparent 40%, var(--color-success) 40%, var(--color-success) 100%);
}

.triangular-chart {
  background: linear-gradient(to right, transparent 0%, var(--color-success) 50%, transparent 100%),
              linear-gradient(to bottom, transparent 40%, var(--color-success) 100%);
}

.right-skew-chart {
  background: linear-gradient(to right, var(--color-warning) 0%, var(--color-warning) 30%, transparent 80%);
}

.left-skew-chart {
  background: linear-gradient(to right, transparent 20%, var(--color-warning) 70%, var(--color-warning) 100%);
}

.skewness-demo {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.skew-controls {
  margin-bottom: var(--spacing-6);
}

.skew-controls label {
  display: block;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
}

.skew-controls input[type="range"] {
  width: 300px;
  margin: 0 var(--spacing-4);
}

.skew-controls span {
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  font-family: var(--font-family-mono);
}

.skew-display {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
}

/* Real Data Analysis */
.real-data-analysis {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-10);
  width: 100%;
  text-align: left;
}

.data-description {
  background: var(--color-bg-1);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-info);
}

.data-description h3 {
  color: var(--color-info);
  margin-bottom: var(--spacing-4);
}

.household-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-top: var(--spacing-4);
}

.household-table th {
  background: var(--color-info);
  color: var(--color-btn-primary-text);
  padding: var(--spacing-3) var(--spacing-4);
  text-align: left;
  font-weight: var(--font-weight-semibold);
}

.household-table td {
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-card-border);
  color: var(--color-text-primary);
}

.household-table tr:nth-child(even) {
  background: var(--color-background);
}

.analysis-results {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
}

.analysis-conclusions {
  margin-top: var(--spacing-6);
}

.conclusion-box {
  background: var(--color-bg-3);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-success);
}

.conclusion-box h4 {
  color: var(--color-success);
  margin-bottom: var(--spacing-4);
}

.conclusion-box ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.conclusion-box li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-primary);
}

/* Misleading Graphs */
.misleading-content {
  width: 100%;
  text-align: left;
}

.problem-explanation {
  background: var(--color-bg-4);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-error);
  margin-bottom: var(--spacing-8);
}

.problem-explanation h3 {
  color: var(--color-error);
  margin-bottom: var(--spacing-4);
}

.chart-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-8);
  margin: var(--spacing-6) 0;
}

.chart-item {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-md);
  text-align: center;
}

.chart-item h4 {
  margin-bottom: var(--spacing-4);
}

.chart-note {
  margin-top: var(--spacing-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-style: italic;
}

.impact-analysis {
  background: var(--color-bg-2);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-warning);
}

.impact-analysis h3 {
  color: var(--color-warning);
  margin-bottom: var(--spacing-6);
}

.impact-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-4);
}

.stat-box {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.stat-box h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-base);
}

.stat-box p {
  font-size: var(--font-size-sm);
  margin: 0;
  color: var(--color-text-primary);
}

/* Misleading Techniques */
.misleading-techniques {
  width: 100%;
  text-align: left;
}

.technique-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-8);
}

.technique-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  text-align: center;
}

.technique-card h3 {
  color: var(--color-error);
  margin-bottom: var(--spacing-4);
}

.technique-demo {
  background: var(--color-secondary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  margin: var(--spacing-4) 0;
}

.demo-chart {
  height: 80px;
  background: var(--color-background);
  border-radius: var(--border-radius-md);
  margin-bottom: var(--spacing-3);
  position: relative;
  overflow: hidden;
}

.improper-scale {
  background: linear-gradient(to right, 
    var(--color-error) 0%, 
    var(--color-error) 20%, 
    transparent 30%, 
    var(--color-error) 60%, 
    var(--color-error) 100%
  );
}

.three-d-effect {
  background: linear-gradient(45deg, 
    var(--color-error) 0%, 
    var(--color-red-400) 50%, 
    var(--color-error) 100%
  );
  transform: perspective(100px) rotateX(10deg);
}

.pictogram-effect {
  background: radial-gradient(circle at center, var(--color-error) 30%, transparent 70%),
              radial-gradient(circle at 20% 80%, var(--color-error) 50%, transparent 70%);
}

.cherry-pick {
  background: linear-gradient(to right, 
    transparent 0%, 
    transparent 40%, 
    var(--color-error) 50%, 
    var(--color-error) 80%, 
    transparent 100%
  );
}

.detection-tips {
  background: var(--color-bg-3);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-success);
}

.detection-tips h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-6);
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-6);
}

.tip-item {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.tip-item h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

.tip-item p {
  font-size: var(--font-size-sm);
  margin: 0;
  color: var(--color-text-secondary);
}

/* Technology Demo */
.technology-demo {
  width: 100%;
  text-align: left;
}

.software-overview {
  margin-bottom: var(--spacing-8);
}

.software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-6);
  margin-top: var(--spacing-6);
}

.software-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
  border-top: 4px solid var(--color-info);
}

.software-card h4 {
  color: var(--color-info);
  margin-bottom: var(--spacing-4);
}

.software-card ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.software-card li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-secondary);
}

.workflow-demo {
  background: var(--color-bg-5);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-primary);
}

.workflow-demo h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-6);
}

.workflow-steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.workflow-step {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-sm);
}

.step-number {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.workflow-step h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
}

.workflow-step p {
  color: var(--color-text-secondary);
  margin: 0;
  font-size: var(--font-size-sm);
}

/* Practice Problems */
.practice-problem {
  width: 100%;
  text-align: left;
}

.problem-statement {
  background: var(--color-bg-1);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-info);
  margin-bottom: var(--spacing-8);
}

.problem-statement h3 {
  color: var(--color-info);
  margin-bottom: var(--spacing-4);
}

.raw-data {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  margin-top: var(--spacing-4);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  border: 1px solid var(--color-card-border);
  line-height: var(--line-height-relaxed);
}

.problem-questions {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
}

.question-set {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.question-item {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  border: 1px solid var(--color-card-border);
}

.question-item p {
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-4);
  color: var(--color-text-primary);
}

.answer-options {
  display: flex;
  gap: var(--spacing-3);
  flex-wrap: wrap;
}

.answer-btn {
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-3) var(--spacing-5);
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.answer-btn:hover {
  background: var(--color-info);
  color: var(--color-btn-primary-text);
  border-color: var(--color-info);
}

.answer-btn[data-correct="true"]:hover {
  background: var(--color-success);
  border-color: var(--color-success);
}

.feedback-box {
  margin-top: var(--spacing-4);
  padding: var(--spacing-4);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-medium);
  display: none;
}

.feedback-box.correct {
  background: var(--color-bg-3);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.feedback-box.incorrect {
  background: var(--color-bg-4);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.problem-solution {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
}

.frequency-builder {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
}

.builder-controls {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
  flex-wrap: wrap;
}

.result-display {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
  overflow-x: auto;
}

.frequency-result {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.frequency-result th {
  background: var(--color-primary);
  color: var(--color-btn-primary-text);
  padding: var(--spacing-3) var(--spacing-4);
  text-align: left;
  font-weight: var(--font-weight-semibold);
}

.frequency-result td {
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: 1px solid var(--color-card-border);
  color: var(--color-text-primary);
  font-family: var(--font-family-mono);
}

.chart-area {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  border: 1px solid var(--color-card-border);
}

/* Billionaire Analysis */
.billionaire-analysis {
  width: 100%;
  text-align: left;
}

.analysis-tabs {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.tab-buttons {
  display: flex;
  background: var(--color-secondary);
  border-bottom: 1px solid var(--color-card-border);
}

.tab-btn {
  flex: 1;
  background: transparent;
  border: none;
  padding: var(--spacing-4) var(--spacing-6);
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  border-bottom: 3px solid transparent;
}

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

.tab-btn.active {
  background: var(--color-surface);
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-content {
  position: relative;
  min-height: 500px;
}

.tab-panel {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-8);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition-medium);
  pointer-events: none;
}

.tab-panel.active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.analysis-chart {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  border: 1px solid var(--color-card-border);
  margin: var(--spacing-6) 0;
}

.analysis-insights {
  background: var(--color-bg-1);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-info);
}

.analysis-insights h4 {
  color: var(--color-info);
  margin-bottom: var(--spacing-4);
}

.analysis-insights ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.analysis-insights li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-primary);
}

.age-statistics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-4);
  margin: var(--spacing-6) 0;
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-4);
  text-align: center;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-card-border);
}

.stat-card h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-base);
}

.stat-card p {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent);
  margin: 0;
  font-family: var(--font-family-mono);
}

.wealth-insights {
  background: var(--color-bg-3);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-success);
}

.wealth-insights h4 {
  color: var(--color-success);
  margin-bottom: var(--spacing-4);
}

.wealth-insights ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.wealth-insights li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-primary);
}

/* Summary and Final Slides */
.summary-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
  width: 100%;
  text-align: left;
}

.key-concepts {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
}

.concept-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-6);
  margin-top: var(--spacing-6);
}

.concept-card {
  background: var(--color-background);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  border-left: 4px solid var(--color-primary);
  transition: var(--transition-medium);
}

.concept-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.concept-card h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.concept-card ul {
  margin: 0;
  padding-left: var(--spacing-6);
}

.concept-card li {
  margin-bottom: var(--spacing-2);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.skills-assessment {
  background: var(--color-bg-3);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  border-left: 4px solid var(--color-success);
}

.skills-assessment h3 {
  color: var(--color-success);
  margin-bottom: var(--spacing-6);
}

.checklist {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.check-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  background: var(--color-surface);
  padding: var(--spacing-4);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

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

.check-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-success);
  cursor: pointer;
}

.check-item label {
  color: var(--color-text-primary);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
}

/* Final Thanks */
.final-thanks {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-8);
  text-align: center;
  width: 100%;
}

.thanks-content {
  max-width: 900px;
}

.thanks-subtitle {
  font-size: var(--font-size-2xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-8);
  font-style: italic;
}

.achievement-badge {
  background: linear-gradient(135deg, var(--color-success) 0%, var(--color-primary) 100%);
  border-radius: var(--border-radius-3xl);
  padding: var(--spacing-10);
  color: var(--color-btn-primary-text);
  margin: var(--spacing-8) 0;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.achievement-badge::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: shimmer 3s linear infinite;
}

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

.badge-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
  position: relative;
  z-index: 1;
}

.badge-icon {
  font-size: var(--font-size-6xl);
}

.badge-text h3 {
  color: var(--color-btn-primary-text);
  margin-bottom: var(--spacing-2);
  font-size: var(--font-size-3xl);
}

.badge-text p {
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
  font-size: var(--font-size-lg);
}

.next-steps {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  width: 100%;
}

.next-steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-6);
  margin: var(--spacing-6) 0;
}

.step-card {
  background: linear-gradient(135deg, var(--color-background) 0%, var(--color-surface) 100%);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-6);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: var(--transition-medium);
  border: 1px solid var(--color-card-border);
}

.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.step-card h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

.step-card p {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-2);
}

.step-card span {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.final-message {
  background: linear-gradient(135deg, var(--color-bg-2) 0%, var(--color-bg-6) 100%);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  margin: var(--spacing-8) 0;
  border-left: 5px solid var(--color-warning);
  box-shadow: var(--shadow-md);
}

.final-message p {
  color: var(--color-text-primary);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  margin: 0;
}

.questions-section {
  background: var(--color-surface);
  border-radius: var(--border-radius-2xl);
  padding: var(--spacing-8);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-card-border);
}

.questions-section h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.questions-section p {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-3);
  line-height: var(--line-height-relaxed);
}

.questions-section p:last-child {
  margin-bottom: 0;
}

/* Slide Navigation Dots */
.slide-dots {
  position: fixed;
  bottom: var(--spacing-6);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-2);
  z-index: var(--z-index-fixed);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--border-radius-3xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-card-border);
  transition: var(--transition-medium);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
  cursor: pointer;
  transition: var(--transition-fast);
  border: 2px solid transparent;
}

.dot:hover {
  background: var(--color-primary-light);
  transform: scale(1.2);
}

.dot.active {
  background: var(--color-primary);
  transform: scale(1.3);
  box-shadow: var(--focus-ring);
}

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

/* Keyboard Navigation Hint */
.keyboard-nav {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  background: rgba(0, 0, 0, 0.8);
  color: var(--color-btn-primary-text);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-xs);
  z-index: var(--z-index-tooltip);
  opacity: 0.7;
  transition: var(--transition-medium);
  font-family: var(--font-family-mono);
}

.keyboard-nav:hover {
  opacity: 1;
  transform: scale(1.05);
}

/* Responsive Design for Mobile Portrait (480px) */
@media (max-width: 480px) {
  .slide {
    padding: var(--space-16);
  }

  .main-title {
    font-size: var(--font-size-4xl);
  }

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

  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

  .nav-controls {
    flex-direction: column;
    gap: var(--space-8);
    padding: var(--space-12) var(--space-16);
  }

  .slide-counter {
    font-size: var(--font-size-base);
    min-width: auto;
  }

  .btn {
    min-width: 80px;
    padding: var(--space-8) var(--space-16);
    font-size: var(--font-size-sm);
  }

  .title-slide {
    padding: var(--space-32);
  }

  .chapter-sections,
  .objectives-grid {
    grid-template-columns: 1fr;
  }

  .case-study-intro {
    grid-template-columns: 1fr;
  }

  .tree-branches {
    grid-template-columns: 1fr;
  }

  .sub-branches {
    grid-template-columns: 1fr;
  }

  .pie-chart-content,
  .bar-chart-content,
  .histogram-content,
  .dotplot-content,
  .stemleaf-content {
    grid-template-columns: 1fr;
  }

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

  .chart-comparison {
    grid-template-columns: 1fr;
  }

  .real-data-analysis {
    grid-template-columns: 1fr;
  }

  .badge-content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-16);
  }

  .badge-icon {
    font-size: var(--font-size-5xl);
  }

  .slide-dots {
    display: none;
  }

  .keyboard-nav {
    display: none;
  }

  .chart-controls,
  .dotplot-controls,
  .stemleaf-controls,
  .histogram-controls,
  .builder-controls {
    flex-direction: column;
    align-items: center;
  }

  .tab-buttons {
    flex-direction: column;
  }

  .tab-btn {
    text-align: center;
  }

  .next-steps-grid {
    grid-template-columns: 1fr;
  }

  .section-card,
  .objective-card,
  .guideline-card,
  .method-card {
    padding: var(--space-16);
  }
}

/* Responsive Design for Tablet/Small Desktop (768px) */
@media (max-width: 768px) {
  .slide {
    padding: var(--space-24);
  }

  .slide-content {
    max-height: 85vh;
    padding: var(--space-12);
    gap: var(--space-12);
  }

  .slide-content.two-column,
  .slide-content.three-column {
    flex-direction: column;
    gap: var(--space-16);
  }

  .slide-content.two-column > *,
  .slide-content.three-column > * {
    max-height: 60vh;
  }

  .main-title {
    font-size: var(--font-size-5xl);
  }

  .subtitle {
    font-size: var(--font-size-2xl);
  }

  h1 {
    font-size: var(--font-size-4xl);
  }

  h2 {
    font-size: var(--font-size-3xl);
  }

  .nav-controls {
    gap: var(--space-16);
    padding: var(--space-8) var(--space-20);
  }

  .chapter-sections,
  .objectives-grid {
    grid-template-columns: 1fr;
  }

  .case-study-intro {
    grid-template-columns: 1fr;
  }

  .tree-branches {
    grid-template-columns: 1fr;
  }

  .sub-branches {
    grid-template-columns: 1fr;
  }

  .pie-chart-content,
  .bar-chart-content,
  .histogram-content,
  .dotplot-content,
  .stemleaf-content {
    grid-template-columns: 1fr;
  }

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

  .chart-comparison {
    grid-template-columns: 1fr;
  }

  .real-data-analysis {
    grid-template-columns: 1fr;
  }

  .badge-content {
    flex-direction: column;
    text-align: center;
  }

  .badge-icon {
    font-size: var(--font-size-5xl);
  }
}

/* Print Styles */
@media print {
  .nav-controls,
  .timer-display,
  .fullscreen-btn,
  .slide-dots,
  .keyboard-nav {
    display: none !important;
  }

  .slide {
    position: relative;
    width: 100%;
    height: auto;
    page-break-after: always;
    opacity: 1;
    transform: none;
    padding: var(--space-32);
  }

  .slide:last-child {
    page-break-after: avoid;
  }

  .slide-content {
    max-width: none;
    height: auto;
  }

  .title-slide {
    background: none;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
  }

  .chart-container {
    background: none;
    box-shadow: none;
    border: 1px solid var(--color-border);
  }
}

/* Dark mode styles for fullscreen */
.presentation-container.fullscreen {
  --color-text-primary: var(--color-text);
  --color-text-secondary: var(--color-text-secondary);
  --color-surface: var(--color-surface);
  --color-surface-secondary: var(--color-secondary);
  --color-border-light: var(--color-border);
  --color-border-medium: var(--color-border);
}

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

@media (prefers-contrast: high) {
  :root {
    --color-primary: var(--color-black);
    --color-secondary: var(--color-black);
    --color-text-primary: var(--color-black);
    --color-background: var(--color-white);
    --color-surface: var(--color-white);
  }
}

/* Focus styles for better accessibility */
*:focus {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

button:focus,
input:focus,
select:focus {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

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

/* High contrast mode support */
@media (forced-colors: active) {
  .btn {
    border: 2px solid;
  }
  
  .chart-container {
    border: 1px solid;
  }
  
  .slide {
    border: 1px solid;
  }
}

/* Content splitting utilities */
.content-too-long {
  /* Add visual indicator when content is too long */
  position: relative;
}

.content-too-long::after {
  content: "⬇ Scroll for more ⬇";
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-warning);
  color: white;
  padding: var(--space-8) var(--space-16);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  animation: pulse 2s infinite;
  z-index: 1000;
}

@keyframes pulse {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

/* Split slide continuation indicator */
.slide-continuation {
  position: absolute;
  bottom: var(--space-16);
  right: var(--space-16);
  background: var(--color-primary);
  color: white;
  padding: var(--space-8) var(--space-12);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
}

/* Large lists should be split into columns */
.slide-content ul.long-list,
.slide-content ol.long-list {
  columns: 2;
  column-gap: var(--space-32);
  column-fill: balance;
}

@media (max-width: 768px) {
  .slide-content ul.long-list,
  .slide-content ol.long-list {
    columns: 1;
  }
}
/* Interaction-safe slides */
.slide {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 300ms ease, transform 300ms ease;
  pointer-events: none; /* do not capture clicks when hidden */
}

.slide.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto; /* the only slide that can receive clicks */
}