/* ==========================================================================
   Karabiner-Elements Official Website
   Stylesheet - Flat Modern Professional Design
   Color Palette Based on Logo (Deep Purple-Gray)
   ========================================================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Brand colors extracted from logo */
  --color-primary: #3E3A49;
  --color-primary-dark: #2A2638;
  --color-primary-light: #524A66;
  --color-secondary: #6B6580;
  --color-accent: #7C5CE0;
  --color-accent-hover: #6B4DD1;
  --color-accent-light: #EDE9F8;

  /* Neutrals */
  --color-bg: #FAFAFB;
  --color-bg-alt: #F4F3F7;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F8F7FB;
  --color-border: #E5E3EC;
  --color-border-light: #EFEDF3;

  /* Text */
  --color-text: #1F1B2E;
  --color-text-secondary: #6B6580;
  --color-text-muted: #9C95AD;
  --color-text-inverse: #FFFFFF;

  /* Status */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;

  /* Code */
  --color-code-bg: #F5F4F8;
  --color-code-text: #2D2A3E;

  /* Typography */
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Consolas, monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(31, 27, 46, 0.04);
  --shadow-md: 0 4px 12px rgba(31, 27, 46, 0.06);
  --shadow-lg: 0 12px 32px rgba(31, 27, 46, 0.08);
  --shadow-xl: 0 24px 64px rgba(31, 27, 46, 0.12);

  /* Layout */
  --container-max: 1200px;
  --header-height: 72px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "cv11", "ss01";
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-border);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.nav-brand:hover {
  color: var(--color-text);
}

.nav-brand-logo {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: block;
}

.nav-brand-name {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav-brand-name strong {
  font-size: 1.0625rem;
  color: var(--color-text);
}

.nav-brand-name span {
  font-size: 0.6875rem;
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-link {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-link:hover {
  color: var(--color-text);
}

.nav-link.is-active {
  color: var(--color-text);
}

.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

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

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.nav-toggle:hover {
  background: var(--color-bg-alt);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
  stroke: var(--color-text);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  box-shadow: 0 1px 2px rgba(124, 92, 224, 0.2);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(124, 92, 224, 0.3);
}

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

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

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

.btn-ghost:hover {
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  padding: var(--space-4xl) 0 var(--space-3xl);
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 70% 20%, rgba(124, 92, 224, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(62, 58, 73, 0.06) 0%, transparent 60%),
    var(--color-bg);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.375rem 0.875rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.hero-eyebrow svg {
  width: 14px;
  height: 14px;
}

.hero h1 {
  font-size: 3.25rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.hero h1 .accent {
  color: var(--color-accent);
  background: linear-gradient(135deg, var(--color-accent) 0%, #9D7FFF 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.lead {
  font-size: 1.1875rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 540px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

.hero-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-meta-item strong {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.hero-meta-item span {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Hero visual - Keyboard illustration */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 460px;
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.hero-card-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
}

.hero-card-dot.red { background: #FF5F57; }
.hero-card-dot.yellow { background: #FEBC2E; }
.hero-card-dot.green { background: #28C840; }

.hero-card-title {
  margin-left: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.hero-config-row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px dashed var(--color-border);
}

.hero-config-row:last-child {
  border-bottom: none;
}

.hero-config-key {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  background: var(--color-bg-alt);
  color: var(--color-text);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  min-width: 80px;
  text-align: center;
}

.hero-config-arrow {
  color: var(--color-text-muted);
  font-size: 1rem;
}

.hero-config-target {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-accent);
  font-weight: 600;
  flex: 1;
}

.hero-config-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-left: auto;
}

/* ==========================================================================
   Section Layout
   ========================================================================== */
.section {
  padding: var(--space-4xl) 0;
}

.section-alt {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-3xl);
}

.section-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.section-title {
  font-size: 2.5rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Features Grid
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 2;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Scenarios Section
   ========================================================================== */
.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.scenario-card {
  display: flex;
  gap: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition);
}

.scenario-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.scenario-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-md);
}

.scenario-icon svg {
  width: 28px;
  height: 28px;
  stroke-width: 1.75;
}

.scenario-content h3 {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.scenario-content p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.scenario-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.scenario-tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  font-weight: 500;
}

/* ==========================================================================
   Stats / Numbers
   ========================================================================== */
.stats {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #FFFFFF;
  padding: var(--space-3xl) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  text-align: center;
}

.stats-item strong {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-xs);
  color: #FFFFFF;
}

.stats-item span {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
}

/* ==========================================================================
   Code Block
   ========================================================================== */
.code-block {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--space-lg) 0;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 1rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.code-block-title {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.code-block-title::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
}

.code-block pre {
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-code-text);
  overflow-x: auto;
  margin: 0;
}

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

.code-block .token-key { color: #7C5CE0; font-weight: 600; }
.code-block .token-string { color: #0F8A6E; }
.code-block .token-comment { color: var(--color-text-muted); font-style: italic; }
.code-block .token-punct { color: var(--color-text-secondary); }
.code-block .token-number { color: #C2410C; }

/* ==========================================================================
   Comparison Table
   ========================================================================== */
.comparison-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9375rem;
}

.comparison-table th {
  background: var(--color-bg-alt);
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.875rem;
}

.comparison-table th:first-child {
  width: 28%;
}

.comparison-table td:first-child {
  font-weight: 600;
  color: var(--color-text);
}

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

.comparison-table tr:hover td {
  background: var(--color-surface-hover);
}

.check-icon {
  color: var(--color-success);
  font-weight: 700;
}

.cross-icon {
  color: var(--color-text-muted);
}

/* ==========================================================================
   Download Section
   ========================================================================== */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.download-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition);
  position: relative;
}

.download-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
}

.download-card.is-recommended {
  border-color: var(--color-accent);
  border-width: 2px;
}

.download-card-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.875rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

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

.download-card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-md);
}

.download-card-icon svg {
  width: 22px;
  height: 22px;
}

.download-card-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
  letter-spacing: -0.01em;
}

.download-card-version {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.download-card-list {
  margin-bottom: var(--space-xl);
}

.download-card-list li {
  padding: var(--space-sm) 0;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-bottom: 1px dashed var(--color-border-light);
}

.download-card-list li:last-child {
  border-bottom: none;
}

.download-card-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.download-card-list li strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ==========================================================================
   Download Modal / Popup
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(31, 27, 46, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
  padding: var(--space-xl);
}

.modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}
button { outline: none } 
.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  max-width: 580px;
  width: 100%;
  padding: var(--space-2xl);
  position: relative;
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.is-open .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.modal-close svg {
  width: 20px;
  height: 20px;
}

.modal-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.modal-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: var(--radius-md);
}

.modal-icon svg {
  width: 28px;
  height: 28px;
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.02em;
}

.modal-subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.modal-qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.qr-item {
  text-align: center;
  padding: var(--space-lg);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.qr-image {
  width: 160px;
  height: 160px;
  margin: 0 auto var(--space-md);
  background: #FFFFFF;
  border-radius: var(--radius-sm);
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
}

.qr-image img {
  width: 100%;
  height: 100%;
  display: block;
}

.qr-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 2px;
}

.qr-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.modal-footer {
  text-align: center;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.modal-footer p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.modal-footer a {
  font-size: 0.8125rem;
  font-weight: 600;
}

/* ==========================================================================
   Page Hero (inner pages)
   ========================================================================== */
.page-hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124, 92, 224, 0.06) 0%, transparent 60%),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.page-hero-inner {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.breadcrumb {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

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

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

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

.page-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  line-height: 1.15;
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   Documentation / Content Layout
   ========================================================================== */
.docs-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-2xl);
  padding: var(--space-3xl) 0;
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  align-self: start;
}

.docs-sidebar h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  padding-left: var(--space-md);
}

.docs-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.docs-nav a {
  display: block;
  padding: 0.5rem var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
}

.docs-nav a:hover {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.docs-nav a.is-active {
  color: var(--color-accent);
  background: var(--color-accent-light);
  border-left-color: var(--color-accent);
  font-weight: 600;
}

.docs-content {
  min-width: 0;
}

.docs-content h2 {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: var(--space-2xl) 0 var(--space-md);
  padding-top: var(--space-md);
}

.docs-content h2:first-child {
  margin-top: 0;
}

.docs-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-xl) 0 var(--space-sm);
  letter-spacing: -0.01em;
}

.docs-content p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.docs-content p strong {
  color: var(--color-text);
  font-weight: 600;
}

.docs-content ul,
.docs-content ol {
  padding-left: var(--space-lg);
  margin-bottom: var(--space-md);
}

.docs-content ul li,
.docs-content ol li {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
  list-style: disc;
}

.docs-content ol li {
  list-style: decimal;
}

.docs-content ul li::marker {
  color: var(--color-accent);
}

.docs-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-accent-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: var(--space-lg) 0;
}

.docs-content blockquote p {
  margin: 0;
  color: var(--color-text);
}

/* ==========================================================================
   FAQ Accordion
   ========================================================================== */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item.is-open {
  border-color: var(--color-accent);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.faq-question:hover {
  background: var(--color-surface-hover);
}

.faq-toggle {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  transition: transform var(--transition);
}

.faq-item.is-open .faq-toggle {
  transform: rotate(45deg);
}

.faq-toggle svg {
  width: 18px;
  height: 18px;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition);
}

.faq-item.is-open .faq-answer {
  max-height: 600px;
}

.faq-answer-inner {
  padding: 0 var(--space-xl) var(--space-lg);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   Changelog Timeline
   ========================================================================== */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: var(--space-3xl);
  padding-bottom: var(--space-2xl);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 4px;
  width: 16px;
  height: 16px;
  background: var(--color-surface);
  border: 3px solid var(--color-accent);
  border-radius: 50%;
  z-index: 1;
}

.timeline-version {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-xs);
}

.timeline-date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-left: var(--space-sm);
}

.timeline-content h4 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.timeline-content p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.timeline-content ul {
  padding-left: var(--space-lg);
}

.timeline-content ul li {
  list-style: disc;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  line-height: 1.6;
}

.timeline-content ul li::marker {
  color: var(--color-accent);
}

/* ==========================================================================
   About Page - Values Cards
   ========================================================================== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.value-card {
  text-align: center;
  padding: var(--space-2xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.value-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.value-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-accent) 0%, #9D7FFF 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
}

.value-icon svg {
  width: 32px;
  height: 32px;
  stroke-width: 2;
}

.value-card h3 {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.value-card p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-secondary);
}

/* ==========================================================================
   CTA Banner
   ========================================================================== */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(124, 92, 224, 0.4) 0%, transparent 70%);
  border-radius: 50%;
}

.cta-banner h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  position: relative;
}

.cta-banner p {
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--space-xl);
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cta-banner .btn-primary {
  background: #FFFFFF;
  color: var(--color-primary);
  position: relative;
}

.cta-banner .btn-primary:hover {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.cta-banner .btn-secondary {
  background: transparent;
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.4);
  position: relative;
}

.cta-banner .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #FFFFFF;
  color: #FFFFFF;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .nav-brand {
  color: #FFFFFF;
  margin-bottom: var(--space-md);
}

.footer-brand .nav-brand strong {
  color: #FFFFFF;
}

.footer-brand .nav-brand span {
  color: rgba(255, 255, 255, 0.5);
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.6);
}

.footer-col h5 {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #FFFFFF;
  margin-bottom: var(--space-md);
}

.footer-col ul li {
  margin-bottom: var(--space-sm);
}

.footer-col ul li a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a:hover {
  color: #FFFFFF;
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: all var(--transition);
}

.footer-social a:hover {
  background: var(--color-accent);
  color: #FFFFFF;
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

/* ==========================================================================
   Utilities
   ========================================================================== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-0 { margin-bottom: 0; }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1024px) {
  .hero h1 { font-size: 2.75rem; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .download-grid { grid-template-columns: 1fr; max-width: 540px; margin-left: auto; margin-right: auto; }
  .values-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-xl) var(--space-md); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-xl); }
  .docs-layout { grid-template-columns: 220px 1fr; gap: var(--space-xl); }
}

@media (max-width: 768px) {
  .container { padding: 0 var(--space-lg); }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    gap: var(--space-xs);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    box-shadow: var(--shadow-lg);
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu .nav-link {
    padding: var(--space-md);
    border-radius: var(--radius-sm);
  }

  .nav-menu .nav-link.is-active {
    background: var(--color-accent-light);
  }

  .nav-menu .nav-link.is-active::after {
    display: none;
  }

  .nav-toggle { display: flex; }
  .nav-actions .btn-secondary { display: none; }

  .hero { padding: var(--space-3xl) 0; }
  .hero-inner { grid-template-columns: 1fr; gap: var(--space-2xl); }
  .hero h1 { font-size: 2.25rem; }
  .hero p.lead { font-size: 1rem; }
  .hero-visual { order: -1; }
  .hero-card { max-width: 100%; }

  .section { padding: var(--space-3xl) 0; }
  .section-title { font-size: 1.875rem; }
  .page-title { font-size: 2rem; }
  .page-subtitle { font-size: 1rem; }

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

  .docs-layout { grid-template-columns: 1fr; }
  .docs-sidebar { position: static; }
  .docs-sidebar h4 { padding-left: 0; }

  .modal-qr-grid { grid-template-columns: 1fr; }
  .qr-image { width: 160px; height: 160px; }

  .cta-banner { padding: var(--space-2xl); }
  .cta-banner h2 { font-size: 1.5rem; }

  .footer-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
  .footer-bottom { flex-direction: column; gap: var(--space-md); text-align: center; }

  .hero-meta { gap: var(--space-lg); }
  .scenario-card { flex-direction: column; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.875rem; }
  .section-title { font-size: 1.625rem; }
  .page-title { font-size: 1.75rem; }
  .stats-item strong { font-size: 1.875rem; }
  .nav-brand-name span { display: none; }
}

/* Print styles */
@media print {
  .site-header, .site-footer, .nav-toggle, .modal-overlay, .cta-banner { display: none; }
  body { color: #000; background: #FFF; }
}