:root {
  --c-deep-blue: #0B1D3A;
  --c-navy: #122B4D;
  --c-gold: #FFC845;
  --c-gold-deep: #E8A33D;
  --c-red: #E63946;
  --c-text: #FFFFFF;
  --c-text-muted: #A8B3C5;
  --c-white: #FFFFFF;
  --c-surface: #F4F7FB;
  --c-border: #DCE3EC;
  --font-heading: "Oswald", "Impact", "Noto Sans CJK SC", "Source Han Sans CN", sans-serif;
  --font-body: "Noto Sans CJK SC", "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "Noto Sans CJK SC", monospace;
  --header-w: 280px;
  --header-bar-h: 64px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(11, 29, 58, .08);
  --shadow-md: 0 8px 24px rgba(11, 29, 58, .14);
  --transition-fast: 200ms ease;
  --transition-med: 320ms cubic-bezier(.2, .8, .2, 1);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--c-deep-blue);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
}

h1 { font-size: clamp(2.75rem, 6vw, 4.5rem); letter-spacing: .01em; }
h2 { font-size: clamp(1.75rem, 3.2vw, 2.5rem); }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }

p, ul, ol, dl, figure { margin: 0; }
ul, ol { padding: 0; }
li { list-style: none; }
a { color: inherit; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; border: none; background: none; }
[hidden] { display: none !important; }

::selection {
  background: var(--c-gold);
  color: var(--c-deep-blue);
}

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

#main-content h2,
#main-content h3 {
  scroll-margin-top: 24px;
}

.page-main {
  margin-left: var(--header-w);
  min-height: 100vh;
  background:
    radial-gradient(1000px 360px at 78% -5%, rgba(255, 200, 69, .06), transparent 60%),
    var(--c-deep-blue);
}

.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 48px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}
.grid > * { grid-column: span 12; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: none;
  color: inherit;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-deep));
  color: var(--c-deep-blue);
  box-shadow: 0 4px 16px rgba(255, 200, 69, .22);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(255, 200, 69, .32);
}
.btn-ghost {
  border-color: rgba(255, 255, 255, .3);
  color: var(--c-text);
}
.btn-ghost:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
  transform: translateY(-2px);
}
.btn-block { width: 100%; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--c-text-muted);
}
.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb-item a { color: inherit; text-decoration: none; }
.breadcrumb-item a:hover { color: var(--c-gold); }
.breadcrumb-sep { color: var(--c-gold); opacity: .65; }
.breadcrumb-current { color: var(--c-text); }

.section-number {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--c-gold);
}
.section-number::after {
  content: "";
  width: 32px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-gold), transparent);
}
.rule-gold {
  display: block;
  width: 56px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-gold-deep));
}

.data-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: rgba(230, 57, 70, .85);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.7;
  white-space: nowrap;
}

.img-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--c-navy);
}
.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 29, 58, 0) 30%, rgba(11, 29, 58, .4) 100%);
  pointer-events: none;
}
.img-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease;
}
.img-frame:hover img { transform: scale(1.04); }
.img-hero { aspect-ratio: 21 / 9; }
.img-card { aspect-ratio: 4 / 3; }
.img-portrait { aspect-ratio: 3 / 4; }

.skip-link {
  position: fixed;
  top: -80px;
  left: 32px;
  z-index: 999;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background: var(--c-gold);
  color: var(--c-deep-blue);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transition: top 200ms ease;
}
.skip-link:focus-visible { top: 16px; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-w);
  z-index: 200;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at 100% 0, rgba(255, 200, 69, .08), transparent 55%),
    linear-gradient(180deg, rgba(255, 255, 255, .02) 1px, transparent 1px),
    var(--c-deep-blue);
  background-size: auto, 26px 26px, auto;
  border-right: 1px solid rgba(255, 255, 255, .07);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 24px 26px;
  border-bottom: 1px solid rgba(255, 255, 255, .07);
}

.brand { display: flex; }
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--c-text);
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-deep));
  color: var(--c-deep-blue);
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  box-shadow: 0 6px 18px rgba(255, 200, 69, .25);
}
.brand-text {
  display: grid;
  gap: 1px;
}
.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .05em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--c-gold);
  line-height: 1.4;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 15px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--c-text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}
.nav-toggle:hover {
  border-color: var(--c-gold);
  background: rgba(255, 255, 255, .05);
  color: var(--c-gold);
}
.nav-toggle-bar {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: background-color 200ms ease;
}
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-med);
}
.nav-toggle-bar::before { top: -6px; }
.nav-toggle-bar::after { top: 6px; }
.nav-toggle[data-open] .nav-toggle-bar { background: transparent; }
.nav-toggle[data-open] .nav-toggle-bar::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[data-open] .nav-toggle-bar::after { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle-label {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
}

.header-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 28px 18px 24px;
  overflow-y: auto;
}

.main-nav { margin-bottom: 28px; }
.nav-list {
  display: grid;
  gap: 4px;
  counter-reset: nav-index;
}
.nav-item { counter-increment: nav-index; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-pill);
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.4;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast),
    opacity var(--transition-fast);
}
.nav-link::before {
  content: "0" counter(nav-index);
  min-width: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--c-gold);
  opacity: .5;
}
.nav-link:hover {
  background: rgba(255, 255, 255, .06);
  color: var(--c-text);
  transform: translateX(3px);
}
.nav-link:hover::before { opacity: 1; }
.nav-link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(255, 200, 69, .16), rgba(255, 200, 69, .02));
  color: var(--c-text);
  font-weight: 600;
}
.nav-link[aria-current="page"]::before { opacity: 1; }

.side-toc {
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, .07);
}
.toc-title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .24em;
  line-height: 1.5;
  color: var(--c-text-muted);
}
.toc-list {
  display: grid;
  gap: 2px;
  counter-reset: toc-index;
}
.toc-item { counter-increment: toc-index; }
.toc-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px;
  border-left: 2px solid transparent;
  border-radius: 0 8px 8px 0;
  color: var(--c-text-muted);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.6;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}
.toc-link::before {
  content: "0" counter(toc-index);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--c-gold);
  opacity: .55;
}
.toc-link:hover {
  background: rgba(255, 255, 255, .04);
  color: var(--c-text);
}
.toc-link.is-current {
  background: rgba(255, 200, 69, .07);
  color: var(--c-gold);
  border-left-color: var(--c-gold);
}
.toc-link.is-current::before { opacity: 1; }

.header-meta {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, .07);
  display: grid;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-text-muted);
}
.meta-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-text);
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 3px rgba(255, 200, 69, .16), 0 0 10px rgba(255, 200, 69, .45);
  animation: dot-pulse 2.4s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(255, 200, 69, .16), 0 0 6px rgba(255, 200, 69, .3); }
  50% { box-shadow: 0 0 0 3px rgba(255, 200, 69, .3), 0 0 16px rgba(255, 200, 69, .6); }
}
.meta-phone { letter-spacing: .12em; }

.site-footer {
  margin-left: var(--header-w);
  background:
    radial-gradient(900px 260px at 85% 0, rgba(255, 200, 69, .05), transparent 55%),
    linear-gradient(180deg, var(--c-navy), var(--c-deep-blue));
  color: var(--c-text-muted);
  font-size: 14px;
  line-height: 1.85;
}
.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, transparent, rgba(255, 200, 69, .55), transparent);
}

.footer-top {
  max-width: 1360px;
  margin: 0 auto;
  padding: 56px 56px 40px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.3fr;
  gap: 48px;
}

.footer-brand {
  display: grid;
  align-content: start;
  gap: 16px;
}
.footer-brand .brand-link { margin-bottom: 4px; }
.footer-trust {
  max-width: 460px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--c-text-muted);
}

.footer-links,
.footer-contact {
  display: grid;
  align-content: start;
  gap: 6px;
}
.footer-title {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .22em;
  line-height: 1.6;
  color: var(--c-gold);
}
.footer-list,
.contact-list {
  display: grid;
  gap: 10px;
}
.footer-list a {
  color: var(--c-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}
.footer-list a:hover {
  color: var(--c-gold);
  padding-left: 4px;
}
.contact-item {
  display: flex;
  gap: 12px;
  font-size: 13px;
  line-height: 1.7;
}
.contact-label {
  flex: 0 0 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--c-gold);
  opacity: .75;
}

.footer-bottom {
  max-width: 1360px;
  margin: 0 auto;
  padding: 18px 56px 26px;
  border-top: 1px solid rgba(255, 255, 255, .07);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-muted);
}
.footer-copy { color: inherit; }
.footer-icp {
  color: var(--c-gold);
  letter-spacing: .1em;
  opacity: .85;
}

.back-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 300;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 20px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-deep));
  color: var(--c-deep-blue);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .35), 0 2px 8px rgba(255, 200, 69, .25);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity 300ms ease,
    transform 300ms ease,
    visibility 300ms ease,
    box-shadow 300ms ease;
}
.back-top:hover {
  box-shadow: 0 12px 30px rgba(0, 0, 0, .4), 0 4px 14px rgba(255, 200, 69, .4);
}
.back-top[data-shown] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-top[data-shown]:hover {
  transform: translateY(-2px);
}

@media (min-width: 768px) {
  .col-span-3 { grid-column: span 3; }
  .col-span-4 { grid-column: span 4; }
  .col-span-5 { grid-column: span 5; }
  .col-span-6 { grid-column: span 6; }
  .col-span-7 { grid-column: span 7; }
  .col-span-8 { grid-column: span 8; }
  .col-span-9 { grid-column: span 9; }
}

@media (max-width: 1279px) {
  .container { padding: 0 32px; }
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
    padding: 44px 32px 32px;
  }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { padding: 18px 32px 24px; }
}

@media (max-width: 1023px) {
  #main-content h2,
  #main-content h3 {
    scroll-margin-top: calc(var(--header-bar-h) + 20px);
  }

  .page-main {
    margin-left: 0;
    padding-top: var(--header-bar-h);
  }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--header-bar-h);
    display: block;
    background: rgba(11, 29, 58, .95);
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
  }
  .header-bar {
    height: 100%;
    padding: 0 16px 0 20px;
    border-bottom: none;
  }
  .brand-link { gap: 10px; }
  .brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    font-size: 18px;
  }
  .brand-name { font-size: 17px; }
  .brand-sub { display: none; }

  .nav-toggle { display: inline-flex; }

  .header-panel {
    position: fixed;
    top: var(--header-bar-h);
    left: 0;
    bottom: 0;
    width: 320px;
    max-width: calc(100vw - 40px);
    flex: none;
    padding: 28px 18px 24px;
    background:
      radial-gradient(circle at 100% 0, rgba(255, 200, 69, .07), transparent 55%),
      var(--c-deep-blue);
    border-right: 1px solid rgba(255, 255, 255, .08);
    box-shadow: 16px 0 40px rgba(0, 0, 0, .4);
    transform: translate3d(-100%, 0, 0);
    transition: transform var(--transition-med);
    z-index: 180;
  }
  .header-panel[data-open] { transform: translate3d(0, 0, 0); }
  .header-meta { display: none; }

  .site-footer { margin-left: 0; }
}

@media (max-width: 767px) {
  .container { padding: 0 20px; }
  .grid { gap: 16px; }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 24px 24px;
  }
  .footer-brand { grid-column: auto; }
  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 16px 24px 28px;
  }
  .back-top {
    right: 16px;
    bottom: 16px;
    padding: 12px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}