:root {
  --color-blue: #1A3A5C;
  --color-snow: #F5F7FA;
  --color-rock: #6D7B8A;
  --color-green: #1E8C57;
  --color-coral: #FF5A5F;
  --color-cream: #FDF3E0;
  --color-brown: #2E1F1A;
  --color-amber: #FF9F1C;
  --font-headline: "Noto Serif Tibetan", "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-body: "Inter", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "SFMono-Regular", "Consolas", "Roboto Mono", monospace;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 32px;
  --space-xl: 48px;
  --border-w: 4px;
  --shadow: 8px 8px 0 var(--color-brown);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-pill: 999px;
  --header-topbar-h: 32px;
  --header-main-h: 72px;
  --transition: 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-brown);
  background: var(--color-snow);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

a {
  color: var(--color-blue);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-blue);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

::selection {
  background: var(--color-coral);
  color: #fff;
}

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

.container {
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

.page-section {
  padding-block: clamp(40px, 8vw, 80px);
  position: relative;
}

.section-label {
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--color-coral);
  text-transform: uppercase;
  display: inline-block;
  margin-bottom: var(--space-xs);
}

.grid {
  display: grid;
  gap: var(--space-md);
}

.grid--5-3-4 {
  grid-template-columns: 5fr 3fr 4fr;
}

.grid--asymmetric {
  grid-template-columns: 2fr 1.5fr 1fr;
  gap: 24px;
}

.skip-link {
  position: fixed;
  top: -64px;
  left: 16px;
  z-index: 2000;
  background: var(--color-cream);
  color: var(--color-blue);
  padding: 12px 24px;
  font-weight: 700;
  border: 3px solid var(--color-brown);
  box-shadow: 4px 4px 0 var(--color-brown);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-blue);
  border-bottom: var(--border-w) solid var(--color-brown);
  box-shadow: 0 4px 0 rgba(46, 31, 26, 0.35);
}

.site-header__topbar {
  background: var(--color-coral);
  border-bottom: 2px solid var(--color-brown);
}

.site-header__topbar .site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-topbar-h);
  padding-block: 4px;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
  gap: 12px;
}

.site-header__status {
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-snow);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-header__status::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--color-brown);
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
  box-shadow: 0 0 0 2px rgba(46, 31, 26, 0.25);
}

.site-header__status-badge {
  font-family: var(--font-data);
  font-size: 0.6rem;
  font-weight: 700;
  background: var(--color-brown);
  color: var(--color-amber);
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.14em;
  flex-shrink: 0;
}

.site-header__main {
  background: var(--color-blue);
  position: relative;
}

.site-header__main .site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-main-h);
  gap: 24px;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

.site-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: var(--color-snow);
  flex-shrink: 0;
}

.site-brand:hover {
  color: var(--color-snow);
}

.site-brand__name {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--color-snow);
  transition: color var(--transition);
}

.site-brand__name::before {
  content: "";
  display: inline-block;
  width: 9px;
  height: 9px;
  background: var(--color-coral);
  margin-right: 10px;
  transform: rotate(45deg);
  vertical-align: middle;
}

.site-brand:hover .site-brand__name {
  color: var(--color-amber);
}

.site-brand__tagline {
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--color-amber);
  border: 1px solid var(--color-amber);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.15em;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  flex: 1;
  justify-content: flex-end;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav__item::before {
  content: attr(data-index);
  font-family: var(--font-data);
  font-size: 0.55rem;
  color: var(--color-rock);
  line-height: 1;
  opacity: 0.7;
}

.site-nav__link {
  display: inline-block;
  padding: 8px 12px;
  color: var(--color-snow);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  background: var(--color-coral);
  color: #fff;
  border-color: var(--color-brown);
  box-shadow: 4px 4px 0 var(--color-brown);
  transform: translate(-2px, -2px);
  outline: none;
}

.site-nav__link[aria-current="page"] {
  background: var(--color-cream);
  color: var(--color-blue);
  border-color: var(--color-brown);
  box-shadow: 3px 3px 0 var(--color-brown);
}

.site-nav__actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.site-nav__action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--color-brown);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.site-nav__action--register {
  background: var(--color-coral);
  color: #fff;
  box-shadow: 4px 4px 0 var(--color-brown);
}

.site-nav__action--register:hover,
.site-nav__action--register:focus-visible {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--color-brown);
  background: #e94e52;
}

.site-nav__action--login {
  background: transparent;
  color: var(--color-snow);
  border-color: rgba(255, 255, 255, 0.6);
}

.site-nav__action--login:hover,
.site-nav__action--login:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-snow);
}

.site-nav-toggle {
  display: none;
}

.site-header__progress {
  height: 4px;
  background: var(--color-brown);
  overflow: hidden;
}

.site-header__progress-bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-amber), var(--color-coral));
  transition: width 0.15s linear;
}

.site-footer {
  background: var(--color-brown);
  color: var(--color-snow);
  border-top: var(--border-w) solid var(--color-coral);
  position: relative;
}

.site-footer a {
  color: var(--color-snow);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-amber);
  text-decoration: underline;
}

.site-footer__deco {
  height: 4px;
  background: linear-gradient(90deg, var(--color-coral) 0%, var(--color-coral) 20%, var(--color-amber) 20%, var(--color-amber) 35%, var(--color-green) 35%, var(--color-green) 55%, var(--color-blue) 55%, var(--color-blue) 100%);
}

.site-footer__inner {
  max-width: 1440px;
  margin-inline: auto;
  padding: 64px clamp(16px, 4vw, 48px);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: clamp(24px, 4vw, 48px);
}

.site-footer__brand-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  margin-bottom: 16px;
}

.site-footer__brand-name {
  font-family: var(--font-headline);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-snow);
  letter-spacing: 0.04em;
}

.site-footer__brand-name::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--color-coral);
  margin-right: 10px;
  transform: rotate(45deg);
  vertical-align: middle;
}

.site-footer__brand-line {
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--color-amber);
  border: 1px solid var(--color-amber);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.site-footer__trust {
  font-size: 0.85rem;
  color: var(--color-rock);
  max-width: 30em;
  line-height: 1.55;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
}

.site-footer__heading {
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-amber);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(245, 247, 250, 0.2);
}

.site-footer__heading::before {
  content: "◆";
  font-size: 0.55rem;
  margin-right: 8px;
  color: var(--color-coral);
}

.site-footer__nav-list,
.site-footer__legal-list {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0;
}

.site-footer__nav-list a,
.site-footer__legal-list a {
  display: inline-block;
  font-size: 0.9rem;
  padding: 4px 0;
}

.site-footer__nav-list a::before {
  content: "›";
  margin-right: 8px;
  color: var(--color-coral);
  font-family: var(--font-data);
  font-weight: 700;
}

.site-footer__legal-list a::before {
  content: "»";
  margin-right: 8px;
  color: var(--color-amber);
  font-family: var(--font-data);
}

.site-footer__contact {
  font-style: normal;
  display: grid;
  gap: 6px;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-snow);
}

.site-footer__contact-item {
  display: block;
}

.site-footer__bottom {
  border-top: 1px solid rgba(245, 247, 250, 0.15);
  background: var(--color-blue);
}

.site-footer__bottom-inner {
  max-width: 1440px;
  margin-inline: auto;
  padding: 16px clamp(16px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--color-rock);
}

.site-footer__copyright,
.site-footer__icp {
  display: inline-block;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 24px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  border: 3px solid var(--color-brown);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn--primary {
  background: var(--color-coral);
  color: #fff;
  box-shadow: 6px 6px 0 var(--color-brown);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-brown);
  background: #e94e52;
}

.btn--secondary {
  background: var(--color-green);
  color: #fff;
  box-shadow: 6px 6px 0 var(--color-brown);
}

.btn--secondary:hover,
.btn--secondary:focus-visible {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-brown);
  background: #16693f;
}

.btn--ghost {
  background: transparent;
  color: var(--color-blue);
  border-color: var(--color-brown);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-cream);
  box-shadow: 4px 4px 0 var(--color-brown);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 2px solid var(--color-brown);
  background: var(--color-cream);
  color: var(--color-brown);
}

.badge--coral {
  background: var(--color-coral);
  color: #fff;
}

.badge--green {
  background: var(--color-green);
  color: #fff;
}

.badge--amber {
  background: var(--color-amber);
  color: var(--color-brown);
}

.card {
  background: var(--color-snow);
  border: var(--border-w) solid var(--color-brown);
  box-shadow: var(--shadow);
  border-radius: 0;
  padding: 24px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card--tilt {
  transform: rotate(-1.5deg);
}

.card--tilt:hover,
.card--tilt:focus-within {
  transform: rotate(0deg) translateY(-4px);
  box-shadow: 12px 12px 0 var(--color-brown);
}

.data-panel {
  background: var(--color-blue);
  color: var(--color-snow);
  border: var(--border-w) solid var(--color-brown);
  box-shadow: var(--shadow);
  padding: 24px;
  font-family: var(--font-data);
}

.data-panel__value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-green);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.data-panel__label {
  font-size: 0.75rem;
  color: var(--color-rock);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.image-frame {
  position: relative;
  overflow: hidden;
  border: var(--border-w) solid var(--color-brown);
  box-shadow: var(--shadow);
  background: var(--color-rock);
  aspect-ratio: 16 / 10;
  width: 100%;
}

.image-frame::before {
  content: "影像占位";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-cream);
  background: repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0 8px, transparent 8px 16px), var(--color-rock);
  z-index: 0;
}

.image-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.image-frame--tilted {
  transform: rotate(-2deg);
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--portrait {
  aspect-ratio: 4 / 5;
}

.breadcrumbs {
  padding: 12px 0;
  font-family: var(--font-data);
  font-size: 0.8rem;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-inline: 6px;
  color: var(--color-rock);
}

.breadcrumbs a {
  color: var(--color-blue);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--color-coral);
}

.breadcrumbs [aria-current="page"] {
  color: var(--color-rock);
}

.divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 24px 0;
  color: var(--color-rock);
}

.divider::before,
.divider::after {
  content: "";
  height: 2px;
  background: var(--color-brown);
  flex: 1;
}

@media (max-width: 960px) {
  .site-nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    background: var(--color-cream);
    border: 3px solid var(--color-brown);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 8px;
    box-shadow: 4px 4px 0 var(--color-brown);
    transition: transform var(--transition), box-shadow var(--transition);
  }

  .site-nav-toggle:hover {
    transform: translate(1px, 1px);
    box-shadow: 2px 2px 0 var(--color-brown);
  }

  .site-nav-toggle__bar {
    width: 18px;
    height: 2px;
    background: var(--color-blue);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
  }

  .site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

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

  .site-nav-toggle[aria-expanded="true"] .site-nav-toggle__bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 12px;
    right: 12px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    background: var(--color-blue);
    border: var(--border-w) solid var(--color-brown);
    box-shadow: 8px 8px 0 var(--color-brown);
    padding: 16px;
    z-index: 90;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    max-height: calc(100vh - 88px);
    max-height: calc(100dvh - 88px);
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    gap: 4px;
  }

  .site-nav__item {
    gap: 10px;
  }

  .site-nav__link {
    display: block;
    padding: 12px 16px;
    width: 100%;
  }

  .site-nav__actions {
    flex-direction: column;
    gap: 8px;
    border-top: 1px solid rgba(245, 247, 250, 0.2);
    padding-top: 16px;
  }

  .site-nav__action {
    width: 100%;
  }

  .grid--5-3-4,
  .grid--asymmetric {
    grid-template-columns: 1fr;
  }

  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .site-brand__tagline {
    display: none;
  }

  .site-header__topbar .site-header__inner {
    justify-content: center;
  }

  .site-header__status-badge {
    display: none;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    padding-block: 40px;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .image-frame--wide {
    aspect-ratio: 16 / 10;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}