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

:root {
  --c-primary: #FF6B00;
  --c-secondary: #0A1F44;
  --c-accent: #C6FF00;
  --c-light: #F5F7FA;
  --c-dark: #182236;
  --c-neutral: #5B6B8B;
  --c-success: #00C853;
  --c-warning: #FFB300;
  --c-danger: #E53935;

  --font-heading: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-num: "Roboto Mono", "Courier New", monospace;

  --border-w: 3px;
  --shadow-brutal-sm: 4px 4px 0 rgba(10, 31, 68, 0.9);
  --shadow-brutal: 6px 6px 0 rgba(10, 31, 68, 0.9);
  --shadow-primary: 6px 6px 0 rgba(255, 107, 0, 0.9);
  --container-w: 1200px;
  --space-section: clamp(3rem, 8vw, 6rem);
}

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

body {
  font-family: var(--font-body);
  background: var(--c-light);
  color: var(--c-dark);
  line-height: 1.8;
  min-height: 100vh;
}

[hidden] { display: none !important; }

ul, ol { padding-inline-start: 1.25rem; }
img { max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.25;
  color: var(--c-secondary);
}

h1 { font-size: clamp(2.2rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.75rem); }
p { margin-block: 0; }
a { color: var(--c-primary); }

:focus-visible { outline: 4px solid var(--c-accent); outline-offset: 2px; }

.container {
  width: min(calc(100% - 2rem), var(--container-w));
  margin-inline: auto;
}

.site-main { display: block; width: 100%; min-height: 70vh; }

.skip-link {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 6000;
  background: var(--c-accent);
  color: var(--c-secondary);
  font-weight: 900;
  padding: 0.75rem 1.25rem;
  text-decoration: none;
  border: 3px solid var(--c-secondary);
  box-shadow: 4px 4px 0 var(--c-secondary);
  transform: translateY(-220%);
  transition: transform 0.2s ease;
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 1001;
  background: var(--c-secondary);
  color: #fff;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  z-index: 5000;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.2);
}

.scroll-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left top;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-primary) 100%);
}

.header-topbar {
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(0, 0, 0, 0.25);
}

.header-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 2.2rem;
  padding-block: 0.35rem;
}

.header-trust {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.02em;
}

.header-live {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-num);
  font-size: 0.75rem;
  color: var(--c-accent);
  white-space: nowrap;
}

.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-accent);
  box-shadow: 0 0 0 0 rgba(198, 255, 0, 0.6);
  animation: livePulse 1.8s infinite;
}

@keyframes livePulse {
  0% { box-shadow: 0 0 0 0 rgba(198, 255, 0, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(198, 255, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(198, 255, 0, 0); }
}

.header-main { background: var(--c-secondary); }

.header-main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 5rem;
  padding-block: 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--c-primary);
  color: var(--c-secondary);
  border: 2px solid #fff;
  box-shadow: 4px 4px 0 var(--c-accent);
  font-family: var(--font-num);
  font-weight: 900;
  font-size: 0.95rem;
  transform: rotate(-4deg);
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.45rem;
  letter-spacing: 0.08em;
}

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

.nav-list {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  counter-reset: nav;
}

.nav-item { counter-increment: nav; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.95rem;
  color: #fff;
  text-decoration: none;
  border: 2px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.nav-link::before {
  content: counter(nav, decimal-leading-zero);
  font-family: var(--font-num);
  font-size: 0.7em;
  color: var(--c-accent);
}

.nav-link:hover {
  background: var(--c-primary);
  color: var(--c-secondary);
  border-color: #fff;
  box-shadow: 3px 3px 0 var(--c-accent);
  transform: translate(-2px, -2px);
}

.nav-link:hover::before,
.nav-link[aria-current="page"]::before { color: inherit; }

.nav-link[aria-current="page"] {
  background: var(--c-accent);
  color: var(--c-secondary);
  border-color: var(--c-accent);
  box-shadow: 4px 4px 0 rgba(255, 255, 255, 0.25);
}

.nav-toggle { display: none; }

.header-stripe {
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--c-primary) 0 18px, var(--c-accent) 18px 36px, #fff 36px 54px);
}

.site-footer {
  background: var(--c-secondary);
  color: rgba(255, 255, 255, 0.8);
}

.site-footer::before {
  content: "";
  display: block;
  height: 8px;
  background: repeating-linear-gradient(90deg, var(--c-primary) 0 18px, var(--c-accent) 18px 36px, #fff 36px 54px);
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 3rem;
  text-decoration: none;
}

.footer-brand .brand-name { color: #fff; }

.footer-lead {
  max-width: 48rem;
  margin-top: 1.25rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.2rem, 2.5vw, 1.75rem);
  line-height: 1.5;
  color: #fff;
}

.footer-grid {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1.2fr 1fr 1.4fr;
  margin-top: 2.5rem;
}

.footer-col { min-width: 0; }

.footer-title {
  margin-bottom: 1rem;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-accent);
}

.footer-list {
  list-style: none;
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
}

.footer-list a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.footer-contact-line {
  font-size: 0.9rem;
  margin-bottom: 0.45rem;
}

.footer-note {
  max-width: 32ch;
  margin-top: 1rem;
  font-size: 0.85rem;
  opacity: 0.72;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 2.5rem;
  padding-block: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.65rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.95rem;
  line-height: 1;
  text-decoration: none;
  border: 3px solid var(--c-secondary);
  background: var(--c-light);
  color: var(--c-secondary);
  box-shadow: 4px 4px 0 var(--c-secondary);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--c-primary);
}

.btn:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 var(--c-secondary);
}

.btn-primary {
  background: var(--c-primary);
  color: var(--c-secondary);
  border-color: var(--c-secondary);
  box-shadow: 4px 4px 0 var(--c-secondary);
}

.btn-primary:hover { box-shadow: 6px 6px 0 var(--c-accent); }

.btn-accent {
  background: var(--c-accent);
  color: var(--c-secondary);
  border-color: var(--c-secondary);
  box-shadow: 4px 4px 0 var(--c-secondary);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.8);
  box-shadow: none;
}

.btn-ghost:hover {
  background: var(--c-accent);
  color: var(--c-secondary);
  box-shadow: 4px 4px 0 rgba(255, 255, 255, 0.4);
}

.section { padding-block: var(--space-section); }
.section-sm { padding-block: 2rem; }
.section-dark { background: var(--c-secondary); color: #fff; }
.section-dark h1, .section-dark h2, .section-dark h3 { color: #fff; }

.section-title {
  margin-bottom: 1rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.15;
  color: var(--c-secondary);
}

.section-dark .section-title { color: #fff; }

.section-subtitle {
  max-width: 60ch;
  margin-top: -0.5rem;
  font-size: 1.1rem;
  color: var(--c-dark);
}

.section-dark .section-subtitle { color: rgba(255, 255, 255, 0.8); }

.section-number {
  margin-bottom: 1rem;
  font-family: var(--font-num);
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  color: var(--c-primary);
}

.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  background: var(--c-light);
  border: var(--border-w) solid var(--c-secondary);
  box-shadow: var(--shadow-brutal);
  padding: clamp(1.25rem, 2.5vw, 2rem);
}

.card-dark {
  background: var(--c-secondary);
  color: #fff;
}

.card-accent { border-top: 8px solid var(--c-primary); }

.image-shell {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--c-secondary);
  border: 3px solid var(--c-secondary);
  box-shadow: var(--shadow-brutal);
}

.image-shell::before {
  content: "";
  display: block;
  padding-top: 62.5%;
}

.image-shell--tall::before { padding-top: 125%; }
.image-shell--wide::before { padding-top: 42%; }

.image-shell img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-shell figcaption {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 0.6rem 1rem;
  background: rgba(10, 31, 68, 0.85);
  color: #fff;
  font-size: 0.85rem;
}

.breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--c-primary);
  text-decoration: none;
  font-weight: 700;
}

.breadcrumb a:hover { color: var(--c-secondary); }
.breadcrumb li[aria-current="page"] { color: var(--c-dark); font-weight: 700; }

.breadcrumb li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--c-neutral);
}

.tabs { margin-block: 2rem; }

.tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  border-bottom: 4px solid var(--c-secondary);
  list-style: none;
}

.tabs-trigger {
  border: 2px solid transparent;
  background: transparent;
  padding: 0.65rem 1.15rem;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.95rem;
  color: var(--c-dark);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.tabs-trigger:hover { border-color: var(--c-secondary); }

.tabs-trigger[aria-selected="true"] {
  background: var(--c-secondary);
  border-color: var(--c-secondary);
  color: #fff;
  box-shadow: 3px 3px 0 var(--c-primary);
}

.tabs-panel { padding-block: 1.5rem; }
.tabs-panel[hidden] { display: none; }

.tabs-dark { color: #fff; }
.tabs-dark .tabs-list { border-color: var(--c-accent); }
.tabs-dark .tabs-trigger { color: #fff; border-color: rgba(255, 255, 255, 0.3); }
.tabs-dark .tabs-trigger[aria-selected="true"] {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-secondary);
  box-shadow: 3px 3px 0 var(--c-primary);
}

[data-reveal] {
  transition: opacity 0.45s ease, transform 0.45s ease;
  will-change: opacity, transform;
}

html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(1.25rem);
}

html.js-reveal [data-reveal="left"] { transform: translateX(-1.25rem); }
html.js-reveal [data-reveal="right"] { transform: translateX(1.25rem); }
html.js-reveal [data-reveal="scale"] { transform: scale(0.96); }

html.js-reveal [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

body[data-nav-open] { overflow: hidden; }

body[data-nav-open]::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(10, 31, 68, 0.6);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

@media (max-width: 60em) {
  .header-topbar-inner { justify-content: center; }
  .header-trust { display: none; }

  .header-main-inner { min-height: 4.2rem; padding-block: 0.5rem; }
  .brand-name { font-size: 1.2rem; }
  .brand-badge { width: 2.2rem; height: 2.2rem; font-size: 0.8rem; }

  .nav-toggle {
    position: relative;
    z-index: 1003;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 2.6rem;
    padding: 0.45rem 1rem;
    background: var(--c-primary);
    color: var(--c-secondary);
    border: 2px solid #fff;
    box-shadow: 3px 3px 0 var(--c-accent);
    font-family: var(--font-heading);
    font-weight: 900;
  }

  .nav-toggle[aria-expanded="true"] {
    background: var(--c-accent);
    color: var(--c-secondary);
    box-shadow: 3px 3px 0 var(--c-primary);
  }

  .nav-toggle-icon {
    display: inline-grid;
    gap: 0.25rem;
    width: 1.15rem;
  }

  .nav-toggle-icon span {
    display: block;
    height: 2px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(1) {
    transform: translateY(0.32rem) rotate(45deg);
  }

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

  .nav-toggle[aria-expanded="true"] .nav-toggle-icon span:nth-child(3) {
    transform: translateY(-0.32rem) rotate(-45deg);
  }

  .nav-toggle-label { display: inline-block; }
  .nav-toggle-label::after { content: "菜单"; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-label::after { content: "关闭"; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 1002;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    width: min(85%, 22rem);
    height: 100vh;
    height: 100dvh;
    padding: calc(6.5rem + env(safe-area-inset-top)) 1.75rem 2rem;
    background: var(--c-secondary);
    border-left: 4px solid var(--c-primary);
    box-shadow: -12px 0 40px rgba(0, 0, 0, 0.3);
    transform: translateX(100%);
    visibility: hidden;
    overflow-y: auto;
    transition: transform 0.3s ease, visibility 0.3s ease;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-item { width: 100%; }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 0;
    font-size: 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    background: transparent;
    box-shadow: none;
    border-color: var(--c-accent);
    color: var(--c-accent);
  }

  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 40em) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

@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;
  }

  .live-dot { box-shadow: none; }

  html.js-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}