:root {
  --color-primary: #1A73E8;
  --color-primary-hover: #1557B0;
  --color-primary-light: rgba(26, 115, 232, 0.08);
  --color-accent: #FF6F00;
  --color-accent-hover: #E05E00;
  --color-accent-light: rgba(255, 111, 0, 0.12);
  --color-dark: #2C3E50;
  --color-dark-light: #3D5166;
  --color-white: #FFFFFF;
  --color-light: #F5F7FA;
  --color-light-border: #E8EDF2;
  --color-success: #27AE60;
  --color-danger: #E74C3C;
  --color-link: #2962FF;
  --color-text: #1A1A2E;
  --color-text-secondary: #5A6A7E;
  --font-family: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', monospace;
  --font-size-h1: 42px;
  --font-size-h2: 24px;
  --font-size-body: 16px;
  --font-size-small: 14px;
  --font-size-xs: 12px;
  --font-weight-h1: 800;
  --font-weight-h2: 600;
  --font-weight-body: 400;
  --font-weight-label: 500;
  --line-height-h1: 1.2;
  --line-height-h2: 1.3;
  --line-height-body: 1.6;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 40px;
  --spacing-2xl: 56px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
  --shadow-header: 0 1px 0 rgba(0, 0, 0, 0.05);
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --container-max: 1280px;
  --header-height: 120px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-body);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

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

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-md);
  z-index: 10000;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-label);
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-xs);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-header);
  transition: background var(--transition-base);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-white);
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-h1);
  line-height: 1;
  text-decoration: none;
  letter-spacing: 1px;
}

.brand:hover {
  color: var(--color-white);
  opacity: 0.9;
}

.brand-icon {
  font-size: 28px;
  line-height: 1;
  opacity: 0.8;
}

.brand-text {
  font-family: var(--font-family);
}

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

.version-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-label);
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.20);
  transition: background var(--transition-fast), border-color var(--transition-fast);
  letter-spacing: 0.3px;
}

.version-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.35);
}

.version-toggle:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

.version-icon {
  font-size: 16px;
  line-height: 1;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: rgba(255, 255, 255, 0.22);
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header-nav {
  display: flex;
  justify-content: center;
  padding: var(--spacing-xs) var(--spacing-md);
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  border-top: 1px solid rgba(255, 255, 255, 0.10);
}

.header-nav ul {
  display: flex;
  gap: var(--spacing-xs);
  width: 100%;
  justify-content: center;
  flex-wrap: wrap;
}

.header-nav a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: rgba(255, 255, 255, 0.78);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-label);
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.header-nav a:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.10);
}

.header-nav a[aria-current="page"] {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.15);
}

.header-nav a[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.site-footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  overflow: hidden;
  margin-top: var(--spacing-2xl);
}

.footer-wave {
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 12px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  opacity: 0.3;
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 12'%3E%3Cpath d='M0,6 Q150,12 300,6 T600,6 T900,6 T1200,6 V12 H0 Z' fill='white'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 12'%3E%3Cpath d='M0,6 Q150,12 300,6 T600,6 T900,6 T1200,6 V12 H0 Z' fill='white'/%3E%3C/svg%3E");
  mask-size: 1200px 12px;
  -webkit-mask-size: 1200px 12px;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md) var(--spacing-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
}

.footer-brand .brand {
  font-size: 22px;
  margin-bottom: var(--spacing-sm);
  display: inline-flex;
}

.trust-statement {
  font-size: var(--font-size-small);
  line-height: var(--line-height-body);
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: var(--spacing-sm);
  max-width: 360px;
  font-style: italic;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.70);
}

.footer-contact a {
  color: rgba(255, 255, 255, 0.80);
}

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

.contact-icon {
  display: inline-block;
  width: 18px;
  text-align: center;
  margin-right: 4px;
  opacity: 0.6;
  font-size: 12px;
}

.footer-links-title {
  display: block;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-label);
  font-family: var(--font-mono);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.72);
  font-size: var(--font-size-small);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  padding-left: 0;
}

.footer-links a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.status-line {
  font-size: var(--font-size-small);
  color: rgba(255, 255, 255, 0.70);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 8px rgba(39, 174, 96, 0.40);
  animation: pulse-dot 2s ease-in-out infinite;
}

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

.version-info {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.40);
  margin-top: var(--spacing-xs);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.45);
}

.footer-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.3px;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 10px 24px;
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-label);
  font-family: var(--font-family);
  border-radius: var(--radius-md);
  border: none;
  background: var(--color-primary);
  color: var(--color-white);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  line-height: 1.4;
}

.btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.25);
}

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

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

.btn-outline:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-hover);
  color: var(--color-primary-hover);
  box-shadow: none;
}

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

.btn-accent:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 12px rgba(255, 111, 0, 0.25);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-small);
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
  padding: var(--spacing-sm) 0;
  flex-wrap: wrap;
}

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

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

.breadcrumb span {
  color: var(--color-text);
  font-weight: var(--font-weight-label);
}

.breadcrumb-sep {
  color: var(--color-text-secondary);
  opacity: 0.4;
  font-size: var(--font-size-xs);
}

.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid var(--color-light-border);
}

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

.card__title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-h2);
  color: var(--color-dark);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--color-primary);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
}

.bento-item {
  --span-row: 1;
  --span-col: 1;
  grid-row: span var(--span-row);
  grid-column: span var(--span-col);
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-label);
  font-family: var(--font-mono);
  background: var(--color-dark);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  letter-spacing: 0.3px;
}

.data-highlight {
  color: var(--color-accent);
  font-weight: var(--font-weight-h1);
}

.stat-positive {
  color: var(--color-success);
  font-weight: var(--font-weight-label);
}

.stat-negative {
  color: var(--color-danger);
  font-weight: var(--font-weight-label);
}

.main-content {
  min-height: 60vh;
  padding-top: var(--spacing-md);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover {
    transform: none;
  }
  .status-dot {
    animation: none;
  }
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
  }
  .footer-meta {
    grid-column: 1 / -1;
  }
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  :root {
    --header-height: 70px;
    --font-size-h1: 28px;
    --font-size-h2: 20px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 28px;
  }

  .nav-toggle {
    display: flex;
  }

  .header-nav {
    display: none;
    padding: 0;
    border-top: none;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .header-nav[data-open],
  .site-header[data-open] .header-nav {
    display: flex;
    flex-direction: column;
    max-height: 80vh;
    overflow-y: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.10);
    padding: var(--spacing-xs) var(--spacing-md) var(--spacing-sm);
  }

  .header-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .header-nav a {
    padding: var(--spacing-sm) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-body);
    white-space: normal;
  }

  .header-nav a[aria-current="page"]::after {
    display: none;
  }

  .header-nav a[aria-current="page"] {
    background: rgba(255, 255, 255, 0.18);
  }

  .version-toggle {
    padding: 6px 10px;
  }
  .version-label {
    display: none;
  }
  .version-icon {
    font-size: 18px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
  }
  .trust-statement {
    max-width: 100%;
  }
  .bento-grid {
    grid-template-columns: 1fr;
  }
  .breadcrumb {
    font-size: var(--font-size-xs);
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .header-nav a {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) 10px;
  }
  .version-label {
    font-size: var(--font-size-xs);
  }
}

[data-version="classic"] {
  --color-primary: #2C3E50;
  --color-primary-hover: #1A252F;
  --color-accent: #C0392B;
  --color-accent-hover: #A93226;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 10px;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.10);
  --shadow-card-hover: 0 2px 8px rgba(0, 0, 0, 0.12);
  --font-family: 'Georgia', 'Noto Serif SC', serif;
  --font-mono: 'Courier New', 'SimSun', monospace;
}

[data-version="classic"] .site-header {
  background: var(--color-dark);
}

[data-version="classic"] .brand-icon {
  display: none;
}

[data-version="classic"] .version-toggle {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.12);
}

[data-version="classic"] .footer-wave {
  opacity: 0.15;
  background: var(--color-dark);
}

[data-version="classic"] .card {
  border: 1px solid #BDC3C7;
}

[data-version="classic"] .card:hover {
  transform: none;
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.08);
}