/* ==========================================================================
   APPLE HIG LIQUID GLASS — DESIGN SYSTEM
   A comprehensive CSS design system inspired by Apple Human Interface Guidelines
   ========================================================================== */

/* ==========================================================================
   SECTION 1: CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ========================================================================== */

:root {
  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", monospace;

  /* Type Scale */
  --text-display: 56px;
  --text-large-title: 40px;
  --text-title1: 32px;
  --text-title2: 26px;
  --text-title3: 22px;
  --text-headline: 17px;
  --text-body: 17px;
  --text-callout: 16px;
  --text-subhead: 15px;
  --text-footnote: 13px;
  --text-caption: 12px;

  /* Font Weights */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;

  /* Line Heights */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.6;

  /* Spacing (8pt grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Border Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* Blur */
  --blur-subtle: 8px;
  --blur-regular: 20px;
  --blur-prominent: 40px;
  --blur-heavy: 80px;

  /* Motion */
  --duration-instant: 100ms;
  --duration-fast: 200ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --easing-decelerate: cubic-bezier(0, 0, 0.2, 1);
  --easing-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Z-Index */
  --z-base: 0;
  --z-raised: 10;
  --z-overlay: 100;
  --z-modal: 200;
  --z-toast: 300;
  --z-sidebar: 400;

  /* Light Mode Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-bg-tertiary: #ebebf0;
  --color-bg-grouped: #f2f2f7;

  --color-text-primary: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-tertiary: #aeaeb2;
  --color-text-placeholder: #c7c7cc;
  --color-text-inverted: #ffffff;
  --color-text-link: #0066cc;

  --color-accent: #0066cc;
  --color-accent-hover: #004f9e;
  --color-accent-tint: rgba(0, 102, 204, 0.1);
  --color-accent-tint-hover: rgba(0, 102, 204, 0.16);

  --color-fill-primary: rgba(60, 60, 67, 0.36);
  --color-fill-secondary: rgba(60, 60, 67, 0.2);
  --color-fill-tertiary: rgba(118, 118, 128, 0.12);
  --color-fill-quaternary: rgba(118, 118, 128, 0.08);

  --color-border: rgba(0, 0, 0, 0.1);
  --color-border-strong: rgba(0, 0, 0, 0.18);
  --color-separator: rgba(60, 60, 67, 0.12);

  --color-glass: rgba(255, 255, 255, 0.72);
  --color-glass-border: rgba(255, 255, 255, 0.6);
  --color-glass-shadow: rgba(0, 0, 0, 0.1);

  /* Semantic Colors */
  --color-success: #34c759;
  --color-success-bg: rgba(52, 199, 89, 0.1);
  --color-warning: #ff9500;
  --color-warning-bg: rgba(255, 149, 0, 0.1);
  --color-danger: #ff3b30;
  --color-danger-bg: rgba(255, 59, 48, 0.1);
  --color-info: #32ade6;
  --color-info-bg: rgba(50, 173, 230, 0.1);
  --color-purple: #af52de;
  --color-purple-bg: rgba(175, 82, 222, 0.1);
  --color-pink: #ff375f;
  --color-pink-bg: rgba(255, 55, 95, 0.1);
  --color-orange: #ff9500;
  --color-teal: #30b0c7;
  --color-indigo: #5856d6;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.06);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12), 0 8px 16px rgba(0, 0, 0, 0.08);

  /* Sidebar width */
  --sidebar-width: 260px;
}

/* ==========================================================================
   DARK MODE TOKENS
   ========================================================================== */

[data-theme="dark"] {
  --color-bg-primary: #000000;
  --color-bg-secondary: #1c1c1e;
  --color-bg-tertiary: #2c2c2e;
  --color-bg-grouped: #1c1c1e;

  --color-text-primary: #f5f5f7;
  --color-text-secondary: #98989d;
  --color-text-tertiary: #636366;
  --color-text-placeholder: #48484a;
  --color-text-link: #409cff;

  --color-accent: #409cff;
  --color-accent-hover: #6eb5ff;
  --color-accent-tint: rgba(64, 156, 255, 0.15);
  --color-accent-tint-hover: rgba(64, 156, 255, 0.22);

  --color-fill-primary: rgba(235, 235, 245, 0.3);
  --color-fill-secondary: rgba(235, 235, 245, 0.16);
  --color-fill-tertiary: rgba(118, 118, 128, 0.24);
  --color-fill-quaternary: rgba(118, 118, 128, 0.18);

  --color-border: rgba(255, 255, 255, 0.1);
  --color-border-strong: rgba(255, 255, 255, 0.18);
  --color-separator: rgba(84, 84, 88, 0.65);

  --color-glass: rgba(28, 28, 30, 0.78);
  --color-glass-border: rgba(255, 255, 255, 0.12);
  --color-glass-shadow: rgba(0, 0, 0, 0.3);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35), 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4), 0 4px 8px rgba(0, 0, 0, 0.25);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5), 0 8px 16px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   SECTION 2: CSS RESET & BASE STYLES
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color var(--duration-normal) var(--easing-standard),
    color var(--duration-normal) var(--easing-standard);
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  color: var(--color-text-primary);
}

p {
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

ul, ol {
  list-style: none;
}

hr {
  border: none;
  border-top: 1px solid var(--color-separator);
  margin: var(--space-6) 0;
}

/* Selection */
::selection {
  background-color: var(--color-accent-tint);
  color: var(--color-accent);
}

/* Focus visible ring */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ==========================================================================
   SECTION 3: LAYOUT SYSTEM
   ========================================================================== */

.layout {
  display: flex;
  min-height: 100vh;
  background: var(--color-bg-primary);
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--color-glass);
  backdrop-filter: blur(var(--blur-prominent));
  -webkit-backdrop-filter: blur(var(--blur-prominent));
  border-right: 1px solid var(--color-border);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transition: transform var(--duration-normal) var(--easing-standard),
              background var(--duration-normal) var(--easing-standard);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--color-separator);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  background: inherit;
  backdrop-filter: blur(var(--blur-prominent));
  -webkit-backdrop-filter: blur(var(--blur-prominent));
  z-index: 1;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.sidebar-logo-mark {
  width: 28px;
  height: 28px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sidebar-logo-mark svg {
  color: white;
  width: 16px;
  height: 16px;
}

.sidebar-logo-text {
  font-size: var(--text-footnote);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.sidebar-logo-text span {
  display: block;
  font-weight: var(--weight-regular);
  color: var(--color-text-secondary);
  font-size: 10px;
  letter-spacing: 0;
}

.theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--color-fill-tertiary);
  color: var(--color-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast) var(--easing-standard),
              color var(--duration-fast) var(--easing-standard),
              transform var(--duration-fast) var(--easing-spring);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-fill-secondary);
  color: var(--color-text-primary);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
}

/* Sidebar Search */
.sidebar-search {
  padding: var(--space-3) var(--space-4);
  flex-shrink: 0;
  border-bottom: 1px solid var(--color-separator);
}

.sidebar-search-inner {
  position: relative;
  display: flex;
  align-items: center;
}

.sidebar-search-icon {
  position: absolute;
  left: var(--space-3);
  color: var(--color-text-tertiary);
  width: 14px;
  height: 14px;
  pointer-events: none;
}

.sidebar-search input {
  width: 100%;
  height: 32px;
  padding: 0 var(--space-3) 0 var(--space-8);
  background: var(--color-fill-tertiary);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: var(--text-subhead);
  color: var(--color-text-primary);
  outline: none;
  transition: border-color var(--duration-fast) var(--easing-standard),
              background var(--duration-fast) var(--easing-standard);
}

.sidebar-search input::placeholder {
  color: var(--color-text-placeholder);
}

.sidebar-search input:focus {
  border-color: var(--color-accent);
  background: var(--color-bg-primary);
}

/* Sidebar Navigation */
.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-3) 0 var(--space-6);
}

.nav-section {
  margin-bottom: var(--space-2);
}

.nav-section-label {
  padding: var(--space-4) var(--space-5) var(--space-1);
  font-size: 10px;
  font-weight: var(--weight-semibold);
  color: var(--color-text-tertiary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px var(--space-5);
  font-size: var(--text-subhead);
  font-weight: var(--weight-regular);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: 0;
  cursor: pointer;
  transition: color var(--duration-fast) var(--easing-standard),
              background var(--duration-fast) var(--easing-standard);
  position: relative;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.nav-item:hover {
  color: var(--color-text-primary);
  background: var(--color-fill-quaternary);
  text-decoration: none;
}

.nav-item.active {
  color: var(--color-accent);
  background: var(--color-accent-tint);
  font-weight: var(--weight-medium);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: var(--color-accent);
  border-radius: 0 2px 2px 0;
}

.nav-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

.nav-item.active .nav-icon,
.nav-item:hover .nav-icon {
  opacity: 1;
}

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* Page Header */
.page-header {
  position: sticky;
  top: 0;
  z-index: var(--z-raised);
  background: var(--color-glass);
  backdrop-filter: blur(var(--blur-regular));
  -webkit-backdrop-filter: blur(var(--blur-regular));
  border-bottom: 1px solid var(--color-separator);
  padding: var(--space-4) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  transition: background var(--duration-normal) var(--easing-standard);
}

.page-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-subhead);
  color: var(--color-text-secondary);
}

.page-breadcrumb a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.page-breadcrumb a:hover {
  color: var(--color-accent);
}

.page-breadcrumb .sep {
  color: var(--color-text-tertiary);
}

.page-breadcrumb .current {
  color: var(--color-text-primary);
  font-weight: var(--weight-medium);
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Menu Toggle (mobile) */
.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  color: var(--color-text-primary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast) var(--easing-standard);
}

.menu-toggle:hover {
  background: var(--color-fill-tertiary);
}

.menu-toggle svg {
  width: 20px;
  height: 20px;
}

/* Content Area */
.content-area {
  padding: var(--space-10) var(--space-8);
  max-width: 900px;
  width: 100%;
}

.content-area-wide {
  padding: var(--space-10) var(--space-8);
  max-width: 1100px;
  width: 100%;
}

/* Section Block */
.section-block {
  margin-bottom: var(--space-16);
}

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

/* Section Header */
.section-header {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-separator);
}

.section-header h2 {
  font-size: var(--text-title2);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: var(--text-callout);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* Sidebar overlay (mobile) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: calc(var(--z-sidebar) - 1);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--easing-standard);
}

.sidebar-overlay.visible {
  opacity: 1;
}

/* ==========================================================================
   SECTION 4: COMPONENT LIBRARY
   ========================================================================== */

/* --------------------------------------------------------------------------
   BUTTONS
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-weight: var(--weight-medium);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
  transition:
    background var(--duration-fast) var(--easing-standard),
    color var(--duration-fast) var(--easing-standard),
    box-shadow var(--duration-fast) var(--easing-standard),
    transform var(--duration-fast) var(--easing-spring),
    border-color var(--duration-fast) var(--easing-standard);
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Sizes */
.btn-sm {
  height: 28px;
  padding: 0 var(--space-3);
  font-size: var(--text-subhead);
  border-radius: var(--radius-sm);
}

.btn-md {
  height: 36px;
  padding: 0 var(--space-5);
  font-size: var(--text-callout);
  border-radius: var(--radius-md);
}

.btn-lg {
  height: 44px;
  padding: 0 var(--space-6);
  font-size: var(--text-headline);
  border-radius: var(--radius-lg);
}

/* Button Variants */
.btn-filled {
  background: var(--color-accent);
  color: var(--color-text-inverted);
  box-shadow: var(--shadow-sm);
}

.btn-filled:hover {
  background: var(--color-accent-hover);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--color-text-inverted);
}

.btn-filled:active {
  box-shadow: var(--shadow-xs);
}

.btn-tinted {
  background: var(--color-accent-tint);
  color: var(--color-accent);
}

.btn-tinted:hover {
  background: var(--color-accent-tint-hover);
  text-decoration: none;
  color: var(--color-accent);
}

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

.btn-gray:hover {
  background: var(--color-fill-secondary);
  text-decoration: none;
  color: var(--color-text-primary);
}

.btn-borderless {
  background: transparent;
  color: var(--color-accent);
  padding-left: var(--space-2);
  padding-right: var(--space-2);
}

.btn-borderless:hover {
  background: var(--color-accent-tint);
  text-decoration: none;
  color: var(--color-accent);
}

.btn-outlined {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn-outlined:hover {
  background: var(--color-accent-tint);
  text-decoration: none;
  color: var(--color-accent);
}

.btn-danger {
  background: var(--color-danger);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
  background: #e0342a;
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: white;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
  background: var(--color-fill-tertiary);
  color: var(--color-text-secondary);
}

.btn-icon:hover {
  background: var(--color-fill-secondary);
  color: var(--color-text-primary);
}

.btn-icon.btn-sm {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
}

.btn-icon.btn-lg {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
}

/* Button with loading spinner */
.btn-loading {
  pointer-events: none;
}

.btn-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* --------------------------------------------------------------------------
   CARDS
   -------------------------------------------------------------------------- */

.card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition:
    box-shadow var(--duration-normal) var(--easing-standard),
    transform var(--duration-normal) var(--easing-standard),
    border-color var(--duration-normal) var(--easing-standard),
    background var(--duration-normal) var(--easing-standard);
}

.card-glass {
  background: var(--color-glass);
  backdrop-filter: blur(var(--blur-regular));
  -webkit-backdrop-filter: blur(var(--blur-regular));
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.card-glass::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5) 40%, rgba(255,255,255,0.8) 60%, transparent);
  pointer-events: none;
}

.card-elevated {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-border-strong);
}

.card-interactive:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-separator);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.card-header h3 {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.card-body {
  padding: var(--space-5) var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-separator);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  background: var(--color-bg-secondary);
}

/* --------------------------------------------------------------------------
   BADGES
   -------------------------------------------------------------------------- */

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--weight-medium);
  letter-spacing: 0.01em;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-sm {
  font-size: 10px;
  padding: 2px var(--space-2);
  height: 18px;
}

.badge-md {
  font-size: var(--text-caption);
  padding: 3px var(--space-3);
  height: 22px;
}

.badge-lg {
  font-size: var(--text-footnote);
  padding: var(--space-1) var(--space-4);
  height: 26px;
}

.badge-blue {
  background: var(--color-accent-tint);
  color: var(--color-accent);
}

.badge-green {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-red {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge-orange {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}

.badge-purple {
  background: var(--color-purple-bg);
  color: var(--color-purple);
}

.badge-gray {
  background: var(--color-fill-tertiary);
  color: var(--color-text-secondary);
}

.badge-outline {
  background: transparent;
  border: 1.5px solid currentColor;
}

/* --------------------------------------------------------------------------
   CHIPS / TAGS
   -------------------------------------------------------------------------- */

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 28px;
  padding: 0 var(--space-3);
  background: var(--color-fill-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-subhead);
  color: var(--color-text-primary);
  font-weight: var(--weight-regular);
  transition: background var(--duration-fast), border-color var(--duration-fast);
}

.chip-filled {
  background: var(--color-accent-tint);
  border-color: transparent;
  color: var(--color-accent);
}

.chip-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border: none;
  background: var(--color-fill-secondary);
  border-radius: 50%;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: 10px;
  line-height: 1;
  padding: 0;
  margin-left: var(--space-1);
  transition: background var(--duration-fast), color var(--duration-fast);
}

.chip-close:hover {
  background: var(--color-fill-primary);
  color: var(--color-text-primary);
}

/* --------------------------------------------------------------------------
   INPUTS & FORMS
   -------------------------------------------------------------------------- */

.input-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.input-label {
  font-size: var(--text-subhead);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  display: block;
}

.input {
  width: 100%;
  background: var(--color-bg-primary);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: border-color var(--duration-fast) var(--easing-standard),
              box-shadow var(--duration-fast) var(--easing-standard),
              background var(--duration-normal) var(--easing-standard);
  outline: none;
  appearance: none;
}

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

.input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-tint);
}

.input.input-error {
  border-color: var(--color-danger);
}

.input.input-error:focus {
  box-shadow: 0 0 0 3px var(--color-danger-bg);
}

.input-sm {
  height: 32px;
  padding: 0 var(--space-3);
  font-size: var(--text-subhead);
}

.input-md {
  height: 40px;
  padding: 0 var(--space-4);
  font-size: var(--text-callout);
}

.input-lg {
  height: 48px;
  padding: 0 var(--space-5);
  font-size: var(--text-headline);
}

.input-helper {
  font-size: var(--text-caption);
  color: var(--color-text-tertiary);
  line-height: var(--leading-normal);
}

.input-error-msg {
  font-size: var(--text-caption);
  color: var(--color-danger);
  display: flex;
  align-items: center;
  gap: 4px;
}

.select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
  cursor: pointer;
}

.textarea {
  width: 100%;
  min-height: 100px;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-primary);
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-size: var(--text-callout);
  font-family: var(--font-sans);
  line-height: var(--leading-relaxed);
  resize: vertical;
  outline: none;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast),
              background var(--duration-normal);
}

.textarea::placeholder {
  color: var(--color-text-placeholder);
}

.textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-tint);
}

/* --------------------------------------------------------------------------
   SEGMENTED CONTROL
   -------------------------------------------------------------------------- */

.segmented {
  display: inline-flex;
  background: var(--color-fill-tertiary);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
  position: relative;
}

.seg-item {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-4);
  font-size: var(--text-subhead);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border: none;
  background: none;
  border-radius: calc(var(--radius-md) - 2px);
  cursor: pointer;
  transition: color var(--duration-fast) var(--easing-standard);
  white-space: nowrap;
  min-height: 30px;
}

.seg-item:hover {
  color: var(--color-text-primary);
}

.seg-item.active {
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
  font-weight: var(--weight-semibold);
}

/* --------------------------------------------------------------------------
   SWITCH / TOGGLE
   -------------------------------------------------------------------------- */

.switch-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  cursor: pointer;
}

.switch {
  position: relative;
  display: inline-block;
  width: 51px;
  height: 31px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-fill-secondary);
  border-radius: var(--radius-full);
  transition: background var(--duration-normal) var(--easing-standard);
}

.switch-slider::before {
  content: '';
  position: absolute;
  height: 27px;
  width: 27px;
  left: 2px;
  bottom: 2px;
  background-color: white;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0,0,0,0.18), 0 1px 2px rgba(0,0,0,0.12);
  transition: transform var(--duration-normal) var(--easing-spring);
}

.switch input:checked + .switch-slider {
  background-color: var(--color-success);
}

.switch input:checked + .switch-slider::before {
  transform: translateX(20px);
}

.switch input:focus-visible + .switch-slider {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   PROGRESS
   -------------------------------------------------------------------------- */

.progress {
  width: 100%;
  height: 6px;
  background: var(--color-fill-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  transition: width var(--duration-slow) var(--easing-decelerate);
}

.progress-bar.success {
  background: var(--color-success);
}

.progress-bar.warning {
  background: var(--color-warning);
}

.progress-bar.danger {
  background: var(--color-danger);
}

.progress-indeterminate .progress-bar {
  width: 40% !important;
  animation: indeterminate 1.2s ease infinite;
}

/* --------------------------------------------------------------------------
   LIST GROUP
   -------------------------------------------------------------------------- */

.list-group {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.list-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-separator);
  transition: background var(--duration-fast) var(--easing-standard);
  min-height: 44px;
}

.list-item:last-child {
  border-bottom: none;
}

.list-item-interactive {
  cursor: pointer;
}

.list-item-interactive:hover {
  background: var(--color-fill-quaternary);
}

.list-item-interactive:active {
  background: var(--color-fill-tertiary);
}

.list-item-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-fill-tertiary);
  flex-shrink: 0;
  color: var(--color-accent);
}

.list-item-content {
  flex: 1;
  min-width: 0;
}

.list-item-title {
  font-size: var(--text-callout);
  font-weight: var(--weight-regular);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.list-item-subtitle {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: 1px;
}

.list-item-meta {
  font-size: var(--text-subhead);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.list-item-disclosure {
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.list-item-disclosure svg {
  width: 14px;
  height: 14px;
}

/* --------------------------------------------------------------------------
   TABLES
   -------------------------------------------------------------------------- */

.table-wrapper {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

table.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-subhead);
}

table.table thead {
  background: var(--color-bg-secondary);
}

table.table thead th {
  padding: var(--space-3) var(--space-5);
  text-align: left;
  font-size: var(--text-caption);
  font-weight: var(--weight-semibold);
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--color-separator);
  white-space: nowrap;
}

table.table tbody td {
  padding: var(--space-3) var(--space-5);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-separator);
  vertical-align: middle;
}

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

table.table-striped tbody tr:nth-child(even) {
  background: var(--color-bg-secondary);
}

table.table-bordered th,
table.table-bordered td {
  border: 1px solid var(--color-separator);
}

table.table tbody tr:hover {
  background: var(--color-fill-quaternary);
}

/* --------------------------------------------------------------------------
   MODAL
   -------------------------------------------------------------------------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--easing-standard);
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.95) translateY(8px);
  opacity: 0;
  transition:
    transform var(--duration-normal) var(--easing-spring),
    opacity var(--duration-normal) var(--easing-standard);
}

.modal-backdrop.open .modal {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-separator);
  flex-shrink: 0;
}

.modal-header h3 {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.modal-close {
  width: 30px;
  height: 30px;
  border: none;
  background: var(--color-fill-tertiary);
  border-radius: 50%;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--duration-fast), color var(--duration-fast);
  flex-shrink: 0;
}

.modal-close:hover {
  background: var(--color-fill-secondary);
  color: var(--color-text-primary);
}

.modal-close svg {
  width: 14px;
  height: 14px;
}

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
  flex: 1;
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-separator);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex-shrink: 0;
  background: var(--color-bg-secondary);
}

/* Bottom Sheet */
.sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--easing-standard);
}

.sheet-backdrop.open {
  opacity: 1;
  pointer-events: all;
}

.sheet {
  background: var(--color-bg-primary);
  border-top: 1px solid var(--color-border);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  transition: transform var(--duration-normal) var(--easing-spring);
}

.sheet-backdrop.open .sheet {
  transform: translateY(0);
}

.sheet-handle {
  display: flex;
  justify-content: center;
  padding: var(--space-3) var(--space-6) 0;
  flex-shrink: 0;
}

.sheet-handle-bar {
  width: 36px;
  height: 4px;
  background: var(--color-fill-secondary);
  border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   TOAST NOTIFICATIONS
   -------------------------------------------------------------------------- */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  min-width: 280px;
  max-width: 400px;
  pointer-events: all;
  animation: slideUp var(--duration-normal) var(--easing-spring) both;
  transition: opacity var(--duration-fast), transform var(--duration-fast);
}

.toast.dismissing {
  opacity: 0;
  transform: translateX(20px);
}

.toast-icon {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 11px;
  font-weight: var(--weight-bold);
}

.toast-success .toast-icon { background: var(--color-success-bg); color: var(--color-success); }
.toast-warning .toast-icon { background: var(--color-warning-bg); color: var(--color-warning); }
.toast-error   .toast-icon { background: var(--color-danger-bg);  color: var(--color-danger);  }
.toast-info    .toast-icon { background: var(--color-info-bg);    color: var(--color-info);    }

.toast-content {
  flex: 1;
  min-width: 0;
}

.toast-title {
  font-size: var(--text-subhead);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.toast-message {
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  margin-top: 1px;
}

.toast-dismiss {
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--duration-fast), background var(--duration-fast);
  flex-shrink: 0;
}

.toast-dismiss:hover {
  color: var(--color-text-primary);
  background: var(--color-fill-tertiary);
}

.toast-dismiss svg {
  width: 12px;
  height: 12px;
}

/* --------------------------------------------------------------------------
   TABS
   -------------------------------------------------------------------------- */

.tabs {
  display: flex;
  flex-direction: column;
}

.tab-list {
  display: flex;
  border-bottom: 1px solid var(--color-separator);
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.tab-list::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-subhead);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  border: none;
  background: none;
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  transition: color var(--duration-fast) var(--easing-standard);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}

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

.tab-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-panel {
  display: none;
  padding: var(--space-5) 0;
  animation: fadeIn var(--duration-fast) ease both;
}

.tab-panel.active {
  display: block;
}

/* --------------------------------------------------------------------------
   CODE BLOCKS
   -------------------------------------------------------------------------- */

.code-block {
  background: #1a1a2e;
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .code-block {
  background: #0d0d14;
  border: 1px solid rgba(255,255,255,0.06);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  background: rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.code-lang {
  font-size: 10px;
  font-weight: var(--weight-semibold);
  color: rgba(255,255,255,0.4);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.code-copy-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 24px;
  padding: 0 var(--space-3);
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xs);
  color: rgba(255,255,255,0.5);
  font-size: 10px;
  font-weight: var(--weight-medium);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background var(--duration-fast), color var(--duration-fast);
}

.code-copy-btn:hover {
  background: rgba(255,255,255,0.14);
  color: rgba(255,255,255,0.8);
}

.code-copy-btn.copied {
  color: var(--color-success);
  border-color: var(--color-success-bg);
}

.code-block pre {
  padding: var(--space-5);
  overflow-x: auto;
  line-height: 1.7;
  color: #e2e8f0;
  margin: 0;
  white-space: pre;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: inherit;
}

/* Syntax highlighting */
.tok-keyword   { color: #c792ea; }
.tok-string    { color: #c3e88d; }
.tok-number    { color: #f78c6c; }
.tok-comment   { color: #546e7a; font-style: italic; }
.tok-function  { color: #82aaff; }
.tok-property  { color: #80cbc4; }
.tok-selector  { color: #ffcb6b; }
.tok-value     { color: #f07178; }
.tok-punct     { color: #89ddff; }

/* --------------------------------------------------------------------------
   COLOR SWATCHES
   -------------------------------------------------------------------------- */

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-4);
}

.swatch {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-primary);
}

.swatch-preview {
  height: 72px;
  width: 100%;
}

.swatch-info {
  padding: var(--space-2) var(--space-3);
}

.swatch-name {
  font-size: var(--text-caption);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  display: block;
}

.swatch-hex {
  font-size: 10px;
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
  display: block;
  margin-top: 1px;
}

/* --------------------------------------------------------------------------
   TOKEN TABLE
   -------------------------------------------------------------------------- */

.token-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-subhead);
}

.token-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-caption);
  font-weight: var(--weight-semibold);
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--color-separator);
}

.token-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-separator);
  vertical-align: middle;
}

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

.token-name {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-accent);
  background: var(--color-accent-tint);
  padding: 2px var(--space-2);
  border-radius: var(--radius-xs);
  white-space: nowrap;
}

.token-value {
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
}

.token-preview {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.token-preview-swatch {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   DO / DON'T CARDS
   -------------------------------------------------------------------------- */

.dont-do-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.do-card,
.dont-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-primary);
}

.do-card {
  border-top: 3px solid var(--color-success);
}

.dont-card {
  border-top: 3px solid var(--color-danger);
}

.do-card-header,
.dont-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-separator);
}

.do-card-header {
  background: var(--color-success-bg);
  color: var(--color-success);
  font-weight: var(--weight-semibold);
  font-size: var(--text-subhead);
}

.dont-card-header {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  font-weight: var(--weight-semibold);
  font-size: var(--text-subhead);
}

.do-card-body,
.dont-card-body {
  padding: var(--space-5);
  font-size: var(--text-subhead);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------------------------------
   CHECKLIST
   -------------------------------------------------------------------------- */

.checklist-section-title {
  font-size: var(--text-subhead);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
  margin-top: var(--space-5);
}

.checklist-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--duration-fast);
}

.checklist-item:hover {
  background: var(--color-fill-quaternary);
}

.checklist-item input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius-xs);
  background: var(--color-bg-primary);
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 1px;
  position: relative;
  transition: background var(--duration-fast), border-color var(--duration-fast);
}

.checklist-item input[type="checkbox"]:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.checklist-item input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 1px;
  width: 6px;
  height: 10px;
  border: 2px solid white;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.checklist-item-text {
  font-size: var(--text-callout);
  color: var(--color-text-primary);
  line-height: var(--leading-relaxed);
}

.checklist-item input[type="checkbox"]:checked ~ .checklist-item-text {
  color: var(--color-text-secondary);
  text-decoration: line-through;
}

/* --------------------------------------------------------------------------
   GLASS SURFACE
   -------------------------------------------------------------------------- */

.glass-surface {
  background: var(--color-glass);
  backdrop-filter: blur(var(--blur-regular));
  -webkit-backdrop-filter: blur(var(--blur-regular));
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.glass-surface::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255,255,255,0.4) 20%,
    rgba(255,255,255,0.9) 50%,
    rgba(255,255,255,0.4) 80%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 1;
}

.glass-surface-dark {
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(var(--blur-prominent));
  -webkit-backdrop-filter: blur(var(--blur-prominent));
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  position: relative;
  overflow: hidden;
}

.glass-surface-dark::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255,255,255,0.15) 30%,
    rgba(255,255,255,0.3) 50%,
    rgba(255,255,255,0.15) 70%,
    transparent
  );
  pointer-events: none;
}

.glass-surface-prominent {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(var(--blur-heavy));
  -webkit-backdrop-filter: blur(var(--blur-heavy));
  border: 1px solid rgba(255,255,255,0.8);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl),
              inset 0 1px 0 rgba(255,255,255,0.9);
  position: relative;
  overflow: hidden;
}

[data-theme="dark"] .glass-surface-prominent {
  background: rgba(40, 40, 42, 0.9);
  border-color: rgba(255,255,255,0.1);
}

/* Liquid Glass Demo */
.liquid-glass-demo {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-2xl);
  aspect-ratio: 16 / 9;
  min-height: 260px;
}

.lg-layer-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 30%, #f093fb 60%, #f5576c 100%);
}

.lg-layer-bg::after {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  top: -100px;
  right: -50px;
}

.lg-layer-content {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.lg-card {
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow:
    0 8px 32px rgba(0,0,0,0.2),
    inset 0 1px 0 rgba(255,255,255,0.6),
    inset 0 -1px 0 rgba(0,0,0,0.05);
  text-align: center;
  min-width: 240px;
}

.lg-card-title {
  font-size: var(--text-title3);
  font-weight: var(--weight-bold);
  color: white;
  text-shadow: 0 1px 4px rgba(0,0,0,0.2);
  margin-bottom: var(--space-2);
}

.lg-card-sub {
  font-size: var(--text-subhead);
  color: rgba(255,255,255,0.8);
}

/* --------------------------------------------------------------------------
   DEMO FRAMES
   -------------------------------------------------------------------------- */

.demo-frame {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  position: relative;
  overflow: hidden;
}

.demo-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
}

.demo-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.demo-label {
  font-size: 10px;
  font-weight: var(--weight-medium);
  color: var(--color-text-tertiary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: center;
}

/* Demo Nav Bar */
.demo-nav-bar {
  background: var(--color-glass);
  backdrop-filter: blur(var(--blur-regular));
  -webkit-backdrop-filter: blur(var(--blur-regular));
  border-bottom: 1px solid var(--color-separator);
  padding: 0 var(--space-5);
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.demo-nav-bar-title {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.demo-nav-bar-leading,
.demo-nav-bar-trailing {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Demo Tab Bar */
.demo-tab-bar {
  background: var(--color-glass);
  backdrop-filter: blur(var(--blur-regular));
  -webkit-backdrop-filter: blur(var(--blur-regular));
  border-top: 1px solid var(--color-separator);
  display: flex;
  padding: var(--space-2) var(--space-2);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.demo-tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--duration-fast);
}

.demo-tab-item:hover {
  background: var(--color-fill-tertiary);
}

.demo-tab-item.active svg {
  color: var(--color-accent);
}

.demo-tab-item.active .demo-tab-label {
  color: var(--color-accent);
}

.demo-tab-item svg {
  width: 22px;
  height: 22px;
  color: var(--color-text-tertiary);
}

.demo-tab-label {
  font-size: 9px;
  font-weight: var(--weight-medium);
  color: var(--color-text-tertiary);
  text-align: center;
}

/* ==========================================================================
   SECTION 5: TYPOGRAPHY STYLES
   ========================================================================== */

.display-text {
  font-size: var(--text-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.03em;
  color: var(--color-text-primary);
}

.large-title {
  font-size: var(--text-large-title);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.title-1 {
  font-size: var(--text-title1);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.title-2 {
  font-size: var(--text-title2);
  font-weight: var(--weight-bold);
  line-height: var(--leading-snug);
  letter-spacing: -0.015em;
  color: var(--color-text-primary);
}

.title-3 {
  font-size: var(--text-title3);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

.headline {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
}

.body-text {
  font-size: var(--text-body);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
}

.callout {
  font-size: var(--text-callout);
  font-weight: var(--weight-regular);
  line-height: var(--leading-relaxed);
  color: var(--color-text-primary);
}

.subhead {
  font-size: var(--text-subhead);
  font-weight: var(--weight-medium);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
}

.footnote {
  font-size: var(--text-footnote);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary);
}

.caption {
  font-size: var(--text-caption);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-tertiary);
}

.mono {
  font-family: var(--font-mono);
}

.text-primary   { color: var(--color-text-primary)   !important; }
.text-secondary { color: var(--color-text-secondary) !important; }
.text-tertiary  { color: var(--color-text-tertiary)  !important; }
.text-accent    { color: var(--color-accent)         !important; }
.text-success   { color: var(--color-success)        !important; }
.text-warning   { color: var(--color-warning)        !important; }
.text-danger    { color: var(--color-danger)         !important; }

/* ==========================================================================
   SECTION 6: UTILITY CLASSES
   ========================================================================== */

/* Spacing — margin-top */
.mt-0  { margin-top: 0; }
.mt-1  { margin-top: var(--space-1); }
.mt-2  { margin-top: var(--space-2); }
.mt-3  { margin-top: var(--space-3); }
.mt-4  { margin-top: var(--space-4); }
.mt-5  { margin-top: var(--space-5); }
.mt-6  { margin-top: var(--space-6); }
.mt-8  { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

/* Margin-bottom */
.mb-0  { margin-bottom: 0; }
.mb-1  { margin-bottom: var(--space-1); }
.mb-2  { margin-bottom: var(--space-2); }
.mb-3  { margin-bottom: var(--space-3); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-5  { margin-bottom: var(--space-5); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

/* Margin-left / right */
.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Padding */
.p-0  { padding: 0; }
.p-2  { padding: var(--space-2); }
.p-3  { padding: var(--space-3); }
.p-4  { padding: var(--space-4); }
.p-5  { padding: var(--space-5); }
.p-6  { padding: var(--space-6); }
.p-8  { padding: var(--space-8); }

.px-2 { padding-left: var(--space-2);  padding-right: var(--space-2);  }
.px-3 { padding-left: var(--space-3);  padding-right: var(--space-3);  }
.px-4 { padding-left: var(--space-4);  padding-right: var(--space-4);  }
.px-5 { padding-left: var(--space-5);  padding-right: var(--space-5);  }
.px-6 { padding-left: var(--space-6);  padding-right: var(--space-6);  }
.px-8 { padding-left: var(--space-8);  padding-right: var(--space-8);  }

.py-2 { padding-top: var(--space-2);  padding-bottom: var(--space-2);  }
.py-3 { padding-top: var(--space-3);  padding-bottom: var(--space-3);  }
.py-4 { padding-top: var(--space-4);  padding-bottom: var(--space-4);  }
.py-5 { padding-top: var(--space-5);  padding-bottom: var(--space-5);  }
.py-6 { padding-top: var(--space-6);  padding-bottom: var(--space-6);  }
.py-8 { padding-top: var(--space-8);  padding-bottom: var(--space-8);  }

/* Flex */
.flex         { display: flex; }
.inline-flex  { display: inline-flex; }
.flex-col     { flex-direction: column; }
.flex-row     { flex-direction: row; }
.flex-wrap    { flex-wrap: wrap; }
.flex-nowrap  { flex-wrap: nowrap; }
.flex-1       { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }

.items-start    { align-items: flex-start; }
.items-center   { align-items: center; }
.items-end      { align-items: flex-end; }
.items-stretch  { align-items: stretch; }

.justify-start   { justify-content: flex-start; }
.justify-center  { justify-content: center; }
.justify-end     { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around  { justify-content: space-around; }

.gap-1  { gap: var(--space-1); }
.gap-2  { gap: var(--space-2); }
.gap-3  { gap: var(--space-3); }
.gap-4  { gap: var(--space-4); }
.gap-5  { gap: var(--space-5); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }

/* Grid */
.grid { display: grid; }

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

.grid-auto   { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

/* Border Radius */
.rounded-xs   { border-radius: var(--radius-xs); }
.rounded-sm   { border-radius: var(--radius-sm); }
.rounded-md   { border-radius: var(--radius-md); }
.rounded-lg   { border-radius: var(--radius-lg); }
.rounded-xl   { border-radius: var(--radius-xl); }
.rounded-2xl  { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Text Alignment */
.text-left   { text-align: left; }
.text-center { text-align: center; }
.text-right  { text-align: right; }

/* Display */
.hidden       { display: none !important; }
.block        { display: block; }
.inline-block { display: inline-block; }
.inline       { display: inline; }

/* Width / Height */
.w-full  { width: 100%; }
.w-auto  { width: auto; }
.h-full  { height: 100%; }
.min-w-0 { min-width: 0; }

/* Overflow */
.overflow-hidden  { overflow: hidden; }
.overflow-auto    { overflow: auto; }
.overflow-x-auto  { overflow-x: auto; }

/* Divider */
.divider {
  height: 1px;
  width: 100%;
  background: var(--color-separator);
  border: none;
  margin: var(--space-5) 0;
}

/* Tag */
.tag {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 var(--space-2);
  background: var(--color-fill-tertiary);
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: var(--weight-semibold);
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag-new     { background: var(--color-success-bg); color: var(--color-success); }
.tag-updated { background: var(--color-accent-tint); color: var(--color-accent); }
.tag-beta    { background: var(--color-warning-bg); color: var(--color-warning); }

/* Label Group */
.label-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.label-group-title {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

.label-group-desc {
  font-size: var(--text-subhead);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* Icon sizing */
.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }

/* ==========================================================================
   SECTION 7: PAGE-SPECIFIC LAYOUT HELPERS
   ========================================================================== */

/* Hero Section */
.hero-section {
  padding: var(--space-20) var(--space-8) var(--space-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(
    ellipse at center,
    var(--color-accent-tint) 0%,
    transparent 65%
  );
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 28px;
  padding: 0 var(--space-4);
  background: var(--color-accent-tint);
  border: 1px solid rgba(0, 102, 204, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-weight: var(--weight-semibold);
  color: var(--color-accent);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
}

[data-theme="dark"] .hero-badge {
  border-color: rgba(64, 156, 255, 0.2);
}

.hero-title {
  font-size: clamp(36px, 6vw, var(--text-display));
  font-weight: var(--weight-bold);
  letter-spacing: -0.03em;
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: clamp(16px, 2.2vw, var(--text-title3));
  font-weight: var(--weight-regular);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  max-width: 560px;
  margin: 0 auto var(--space-10);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

.feature-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: box-shadow var(--duration-normal), transform var(--duration-normal), border-color var(--duration-normal);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-tint);
  color: var(--color-accent);
  flex-shrink: 0;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-title {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.feature-desc {
  font-size: var(--text-subhead);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* Stats Row */
.stat-row {
  display: flex;
  gap: var(--space-8);
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-separator);
  border-bottom: 1px solid var(--color-separator);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.stat-number {
  font-size: var(--text-title1);
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-number span {
  color: var(--color-accent);
}

.stat-label {
  font-size: var(--text-subhead);
  color: var(--color-text-secondary);
}

/* ==========================================================================
   SECTION 8: ANIMATIONS & TRANSITIONS
   ========================================================================== */

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

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes shimmer {
  from { background-position: -200% 0; }
  to   { background-position: 200% 0; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes indeterminate {
  from { transform: translateX(-100%); }
  to   { transform: translateX(300%); }
}

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

@keyframes bounceIn {
  0%   { transform: scale(0.3); opacity: 0; }
  50%  { transform: scale(1.05); }
  70%  { transform: scale(0.9); }
  100% { transform: scale(1); opacity: 1; }
}

/* Animation utility classes */
.animate-slide-up    { animation: slideUp var(--duration-normal) var(--easing-decelerate) both; }
.animate-slide-down  { animation: slideDown var(--duration-normal) var(--easing-decelerate) both; }
.animate-fade-in     { animation: fadeIn var(--duration-fast) ease both; }
.animate-scale-in    { animation: scaleIn var(--duration-normal) var(--easing-spring) both; }
.animate-spin        { animation: spin 1s linear infinite; }
.animate-pulse       { animation: pulse 2s ease-in-out infinite; }

/* Staggered animation delays */
.delay-1  { animation-delay: 50ms; }
.delay-2  { animation-delay: 100ms; }
.delay-3  { animation-delay: 150ms; }
.delay-4  { animation-delay: 200ms; }
.delay-5  { animation-delay: 250ms; }

/* Scroll-triggered animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity var(--duration-slow) var(--easing-decelerate),
    transform var(--duration-slow) var(--easing-decelerate);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Skeleton / shimmer loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-fill-tertiary) 25%,
    var(--color-fill-quaternary) 50%,
    var(--color-fill-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   SECTION 9: SCROLLBAR STYLING
   ========================================================================== */

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

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

::-webkit-scrollbar-thumb {
  background: var(--color-fill-secondary);
  border-radius: var(--radius-full);
  transition: background var(--duration-fast);
}

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

::-webkit-scrollbar-corner {
  background: transparent;
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-fill-secondary) transparent;
}

/* ==========================================================================
   SECTION 10: RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .dont-do-grid {
    grid-template-columns: 1fr;
  }

  .content-area,
  .content-area-wide {
    padding: var(--space-8) var(--space-6);
  }
}

@media (max-width: 768px) {
  /* Sidebar becomes drawer */
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

  .sidebar-overlay {
    display: block;
  }

  /* Main content fills width */
  .main-content {
    margin-left: 0;
  }

  /* Show menu toggle */
  .menu-toggle {
    display: flex;
  }

  /* Page header adjustments */
  .page-header {
    padding: var(--space-3) var(--space-4);
  }

  /* Content area */
  .content-area,
  .content-area-wide {
    padding: var(--space-6) var(--space-4);
  }

  /* Hero section */
  .hero-section {
    padding: var(--space-16) var(--space-4) var(--space-10);
  }

  /* Feature grid to single column */
  .feature-grid {
    grid-template-columns: 1fr;
  }

  /* Grid adjustments */
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-cols-2 {
    grid-template-columns: 1fr;
  }

  /* Stats */
  .stat-row {
    gap: var(--space-6);
  }

  /* Modals */
  .modal {
    margin: var(--space-4);
    max-width: calc(100% - var(--space-8));
    border-radius: var(--radius-2xl);
  }

  /* Toasts */
  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
    bottom: var(--space-4);
  }

  .toast {
    min-width: unset;
    max-width: unset;
    width: 100%;
  }

  /* Code blocks */
  .code-block {
    border-radius: var(--radius-md);
  }

  /* Table */
  .token-table td:nth-child(3) {
    display: none;
  }
}

@media (max-width: 480px) {
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }

  .swatch-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .section-header h2 {
    font-size: var(--text-title3);
  }
}

/* ==========================================================================
   SECTION 11: PRINT STYLES
   ========================================================================== */

@media print {
  .sidebar,
  .menu-toggle,
  .page-header,
  .toast-container,
  .modal-backdrop,
  .sheet-backdrop,
  .theme-toggle {
    display: none !important;
  }

  .main-content {
    margin-left: 0 !important;
  }

  .content-area,
  .content-area-wide {
    max-width: 100%;
    padding: 0;
  }

  body {
    background: white;
    color: black;
  }

  .card,
  .card-glass,
  .card-elevated {
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a {
    color: inherit;
  }

  .code-block {
    background: #f5f5f5;
    color: black;
    border: 1px solid #ccc;
  }

  .code-block pre {
    color: black;
  }
}

/* ==========================================================================
   ADDITIONAL COMPONENT STYLES
   ========================================================================== */

/* Inline code */
code:not(.code-block code) {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-fill-tertiary);
  color: var(--color-accent);
  padding: 2px var(--space-2);
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-border);
}

/* Blockquote */
blockquote {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-4) var(--space-5);
  background: var(--color-accent-tint);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
  font-size: var(--text-callout);
  line-height: var(--leading-relaxed);
}

blockquote p {
  margin: 0;
  color: inherit;
}

/* Info / callout boxes */
.callout-box {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid;
}

.callout-box-info {
  background: var(--color-info-bg);
  border-color: rgba(50, 173, 230, 0.2);
  color: var(--color-info);
}

.callout-box-warning {
  background: var(--color-warning-bg);
  border-color: rgba(255, 149, 0, 0.2);
  color: var(--color-warning);
}

.callout-box-success {
  background: var(--color-success-bg);
  border-color: rgba(52, 199, 89, 0.2);
  color: var(--color-success);
}

.callout-box-danger {
  background: var(--color-danger-bg);
  border-color: rgba(255, 59, 48, 0.2);
  color: var(--color-danger);
}

.callout-box-icon {
  flex-shrink: 0;
  margin-top: 1px;
}

.callout-box-icon svg {
  width: 18px;
  height: 18px;
}

.callout-box-content {
  flex: 1;
}

.callout-box-title {
  font-size: var(--text-subhead);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-1);
  color: inherit;
}

.callout-box-text {
  font-size: var(--text-subhead);
  line-height: var(--leading-relaxed);
  color: inherit;
  opacity: 0.85;
  margin: 0;
}

/* Tooltip */
.tooltip-wrapper {
  position: relative;
  display: inline-flex;
}

.tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text-primary);
  color: var(--color-bg-primary);
  font-size: var(--text-caption);
  font-weight: var(--weight-medium);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--duration-fast), transform var(--duration-fast);
  transform: translateX(-50%) translateY(4px);
  z-index: var(--z-overlay);
}

.tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: var(--color-text-primary);
}

.tooltip-wrapper:hover .tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Dropdown */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  left: 0;
  min-width: 200px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-1) 0;
  z-index: var(--z-overlay);
  opacity: 0;
  pointer-events: none;
  transform: scale(0.95) translateY(-4px);
  transform-origin: top left;
  transition: opacity var(--duration-fast), transform var(--duration-fast);
}

.dropdown-menu.open {
  opacity: 1;
  pointer-events: all;
  transform: scale(1) translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-subhead);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: background var(--duration-fast);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.dropdown-item:hover {
  background: var(--color-fill-quaternary);
}

.dropdown-item.danger {
  color: var(--color-danger);
}

.dropdown-divider {
  height: 1px;
  background: var(--color-separator);
  margin: var(--space-1) 0;
}

/* Avatar */
.avatar {
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-accent-tint);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--weight-semibold);
}

.avatar-sm { width: 28px; height: 28px; font-size: 11px; }
.avatar-md { width: 36px; height: 36px; font-size: 14px; }
.avatar-lg { width: 48px; height: 48px; font-size: 18px; }
.avatar-xl { width: 64px; height: 64px; font-size: 24px; }

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Accordion */
.accordion {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.accordion-item {
  border-bottom: 1px solid var(--color-separator);
}

.accordion-item:last-child {
  border-bottom: none;
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-5) var(--space-6);
  background: none;
  border: none;
  text-align: left;
  cursor: pointer;
  font-size: var(--text-callout);
  font-weight: var(--weight-medium);
  color: var(--color-text-primary);
  transition: background var(--duration-fast);
  gap: var(--space-4);
}

.accordion-trigger:hover {
  background: var(--color-fill-quaternary);
}

.accordion-chevron {
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  transition: transform var(--duration-normal) var(--easing-spring);
}

.accordion-item.open .accordion-chevron {
  transform: rotate(180deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-normal) var(--easing-standard),
              padding var(--duration-normal) var(--easing-standard);
}

.accordion-item.open .accordion-content {
  max-height: 500px;
}

.accordion-body {
  padding: 0 var(--space-6) var(--space-5);
  color: var(--color-text-secondary);
  font-size: var(--text-callout);
  line-height: var(--leading-relaxed);
}

/* Notification dot */
.dot-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-danger);
  display: inline-block;
}

.dot-indicator-success { background: var(--color-success); }
.dot-indicator-warning { background: var(--color-warning); }
.dot-indicator-info    { background: var(--color-info); }

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16) var(--space-8);
  text-align: center;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  background: var(--color-fill-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-text-tertiary);
}

.empty-state-icon svg {
  width: 32px;
  height: 32px;
}

.empty-state-title {
  font-size: var(--text-headline);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.empty-state-desc {
  font-size: var(--text-subhead);
  color: var(--color-text-secondary);
  max-width: 320px;
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

/* Page-level navigation (within content) */
.on-this-page {
  position: sticky;
  top: 72px;
  padding: var(--space-4) 0;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
}

.on-this-page-title {
  font-size: var(--text-caption);
  font-weight: var(--weight-semibold);
  color: var(--color-text-tertiary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.on-this-page-link {
  display: block;
  padding: var(--space-1) 0;
  font-size: var(--text-caption);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast);
  line-height: var(--leading-relaxed);
}

.on-this-page-link:hover,
.on-this-page-link.active {
  color: var(--color-accent);
  text-decoration: none;
}

.on-this-page-link.indent {
  padding-left: var(--space-3);
}

/* Anchor heading links */
.anchor-heading {
  position: relative;
  scroll-margin-top: 80px;
}

.anchor-link {
  position: absolute;
  left: -24px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  opacity: 0;
  transition: opacity var(--duration-fast);
  text-decoration: none;
}

.anchor-heading:hover .anchor-link {
  opacity: 1;
}

.anchor-link svg {
  width: 14px;
  height: 14px;
}

/* Spec measurement annotation */
.spec-annotation {
  position: relative;
  display: inline-block;
}

.spec-line {
  position: absolute;
  background: var(--color-accent);
}

.spec-label {
  position: absolute;
  background: var(--color-accent);
  color: white;
  font-size: 9px;
  font-weight: var(--weight-bold);
  font-family: var(--font-mono);
  padding: 1px 4px;
  border-radius: 2px;
  white-space: nowrap;
}

/* Color grid for palette display */
.color-scale {
  display: flex;
  border-radius: var(--radius-md);
  overflow: hidden;
  height: 48px;
}

.color-scale-step {
  flex: 1;
  cursor: pointer;
  transition: flex var(--duration-fast);
}

.color-scale-step:hover {
  flex: 2;
}