:root {
  --color-primary: #FF6B35;
  --color-secondary: #003F5C;
  --color-accent: #00E676;
  --color-background: #FDF6E3;
  --color-text: #2C1E16;
  --color-red: #D94A3D;
  --color-gray: #607D8B;
  --color-shadow: rgba(44,30,22,0.8);
  --color-white: #FDF6E3;
  --font-primary: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-heading: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Courier New', monospace;
  --header-height: 68px;
  --container-width: 1200px;
  --border-width: 4px;
  --border-radius: 4px;
  --shadow-sm: 0 2px 8px var(--color-shadow);
  --shadow-lg: 0 6px 24px var(--color-shadow);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

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

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

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

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 10000;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 700;
  font-size: 0.875rem;
}

.skip-link:focus {
  top: 0;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  width: 0%;
  height: 4px;
  background: var(--color-primary);
  transition: width 0.1s linear;
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 9000;
  background: var(--color-secondary);
  border-bottom: var(--border-width) solid var(--color-primary);
  box-shadow: var(--shadow-lg);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  text-decoration: none;
}

.brand-link:hover {
  color: inherit;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--color-white);
  opacity: 0.8;
  display: none;
}

@media (min-width: 640px) {
  .brand-tagline {
    display: inline;
  }
}

.live-indicator {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius);
  font-size: 0.65rem;
  font-family: var(--font-mono);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.9;
}

.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.7); }
}

.live-text {
  font-size: 0.6rem;
  font-weight: 700;
}

.site-nav {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--color-secondary);
  border-bottom: var(--border-width) solid var(--color-primary);
  padding: 0.75rem 1.25rem;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: var(--shadow-lg);
}

.site-nav[data-open] {
  display: flex;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-white);
  border-left: 3px solid transparent;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  text-decoration: none;
}

.nav-link:hover {
  background: rgba(255,107,53,0.12);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-link[aria-current="page"] {
  background: rgba(255,107,53,0.15);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 700;
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-gray);
  min-width: 1.8em;
  letter-spacing: 0.04em;
}

.nav-link:hover .nav-index,
.nav-link[aria-current="page"] .nav-index {
  color: var(--color-primary);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(253,246,227,0.25);
  border-radius: var(--border-radius);
  cursor: pointer;
  padding: 8px;
  transition: border-color var(--transition), background var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-primary);
  background: rgba(255,107,53,0.08);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-primary);
  background: rgba(255,107,53,0.12);
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (min-width: 900px) {
  .site-nav {
    display: flex;
    position: static;
    flex-direction: row;
    border-bottom: none;
    padding: 0;
    background: transparent;
    box-shadow: none;
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-link {
    padding: 0.5rem 0.75rem;
    border-left: none;
    border-bottom: 3px solid transparent;
    font-size: 0.85rem;
  }

  .nav-link:hover {
    border-left-color: transparent;
    border-bottom-color: var(--color-primary);
    background: transparent;
  }

  .nav-link[aria-current="page"] {
    border-left-color: transparent;
    border-bottom-color: var(--color-primary);
    background: transparent;
  }

  .nav-toggle {
    display: none;
  }
}

.site-footer {
  background: var(--color-secondary);
  border-top: var(--border-width) solid var(--color-red);
  padding: 2.5rem 0 1.5rem;
  margin-top: 3rem;
  box-shadow: 0 -4px 20px var(--color-shadow);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: flex-start;
}

@media (min-width: 640px) {
  .footer-top {
    flex-direction: row;
    align-items: center;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-brand-name {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}

.footer-brand-desc {
  font-size: 0.8rem;
  color: var(--color-white);
  opacity: 0.7;
}

.footer-trust {
  font-size: 0.7rem;
  color: var(--color-gray);
  line-height: 1.5;
  max-width: 380px;
  margin-top: 0.2rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
}

.footer-link {
  font-size: 0.85rem;
  color: var(--color-white);
  opacity: 0.8;
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: opacity var(--transition), border-color var(--transition), color var(--transition);
}

.footer-link:hover {
  opacity: 1;
  border-bottom-color: var(--color-primary);
  color: var(--color-primary);
}

.footer-divider {
  height: 1px;
  background: rgba(253,246,227,0.12);
  margin: 0.25rem 0;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: var(--color-gray);
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--color-white);
  opacity: 0.5;
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
}

.footer-contact {
  font-size: 0.7rem;
  line-height: 1.5;
  opacity: 0.7;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  font-family: var(--font-primary);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
  border: 2px solid var(--color-primary);
  border-radius: var(--border-radius);
  background: var(--color-primary);
  color: var(--color-white);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.btn:hover {
  background: transparent;
  color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary);
}

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

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

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  padding: 0.75rem 0;
  font-size: 0.8rem;
  color: var(--color-gray);
  list-style: none;
}

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

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

.breadcrumb span {
  color: var(--color-text);
  opacity: 0.7;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .content-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .content-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--color-white);
  border: 3px solid var(--color-secondary);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .card:hover {
    transform: none;
  }

  .live-dot {
    animation: none;
    opacity: 1;
  }

  .nav-toggle .hamburger-line {
    transition: none;
  }

  .scroll-progress {
    transition: none;
  }
}