:root {
  --color-primary: #0B5D3B;
  --color-primary-dark: #063D26;
  --color-secondary: #2E8B57;
  --color-gold: #D4AF37;
  --color-gold-dark: #B8860B;
  --color-black: #1A1A1A;
  --color-paper: #F5EFE0;
  --color-text-dark: #1A1A1A;
  --color-text-light: #F5EFE0;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  --font-display: "Impact", "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Roboto Mono", "Consolas", "Liberation Mono", monospace;
  --header-height: 74px;
  --pad: clamp(18px, 4vw, 48px);
}

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

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

body {
  margin: 0;
  background: var(--color-primary);
  color: var(--color-text-light);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

#main-content { scroll-margin-top: var(--header-height); }

body.nav-locked { overflow: hidden; }

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

ul, ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4, p, figure { margin: 0; }

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

::selection { background: var(--color-gold); color: var(--color-black); }

.container {
  width: min(1180px, 100% - 2 * var(--pad));
  margin-inline: auto;
}

.section { position: relative; padding-block: clamp(64px, 10vw, 120px); }
.section--green { background: var(--color-primary); color: var(--color-text-light); }
.section--black { background: var(--color-black); color: var(--color-text-light); }
.section--paper { background: var(--color-paper); color: var(--color-text-dark); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: clamp(32px, 5vw, 48px);
}

.section-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 6px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: 0.01em;
}

.section-desc { max-width: 560px; color: rgba(245, 239, 224, 0.76); }
.section--paper .section-desc { color: rgba(26, 26, 26, 0.72); }

.chapter-label {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.chapter-label::before {
  content: "";
  width: 40px;
  height: 2px;
  background: currentColor;
}

.index-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--color-gold);
  color: var(--color-black);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.tag--ghost {
  background: transparent;
  color: var(--color-gold);
  border: 1px solid currentColor;
  clip-path: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35); }

.btn-primary { background: var(--color-gold); color: var(--color-black); }
.btn-ghost { border: 1px solid currentColor; color: var(--color-text-light); background: transparent; }
.btn-small { padding: 8px 18px; font-size: 12px; }

.grid { display: grid; gap: 28px; }
.grid-feature { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); align-items: center; }
.grid-cards { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

@media (max-width: 860px) {
  .grid-feature { grid-template-columns: 1fr; }
}

.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(135deg, rgba(11, 93, 59, 0.85), rgba(26, 26, 26, 0.95));
}

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(115deg, transparent 0 58%, rgba(212, 175, 55, 0.18) 58.5%, transparent 59.5%),
    linear-gradient(25deg, transparent 0 74%, rgba(46, 139, 87, 0.25) 74.5%, transparent 75.5%),
    linear-gradient(0deg, rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0) 40%);
}

.media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.08) saturate(1.05);
}

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

.media--clip { clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px)); }

.media-caption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  padding-top: 4px;
  border-top: 1px solid rgba(212, 175, 55, 0.3);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-gold);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.data-table th {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.data-table td {
  padding: 12px;
  border-bottom: 1px solid rgba(245, 239, 224, 0.12);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(245, 239, 224, 0.72);
}

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

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-height) + clamp(48px, 10vh, 100px)) var(--pad) 72px;
  overflow: hidden;
  background: var(--color-primary);
}

.hero::after {
  content: "";
  position: absolute;
  right: -8%;
  top: 0;
  bottom: 0;
  width: 26%;
  background: linear-gradient(135deg, transparent 0 45%, rgba(212, 175, 55, 0.25) 45%, transparent 55%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(44px, 8vw, 96px);
  line-height: 0.95;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.hero-lede {
  max-width: 520px;
  font-size: 18px;
  line-height: 1.8;
  color: rgba(245, 239, 224, 0.85);
}

.hero-index {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.skip-link {
  position: absolute;
  left: 0;
  top: -100%;
  z-index: 1200;
  padding: 12px 20px;
  background: var(--color-gold);
  color: var(--color-black);
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: top 0.2s ease;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(180deg, rgba(11, 93, 59, 0.92) 0%, rgba(11, 93, 59, 0.72) 100%);
  transition: background-color 0.35s ease, box-shadow 0.35s ease;
}

.site-header[data-scrolled="true"] {
  background: rgba(11, 93, 59, 0.97);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.header-inner {
  width: min(1320px, 100% - 2 * var(--pad));
  margin-inline: auto;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  background: var(--color-black);
  color: var(--color-gold);
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.5px;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.brand-word {
  display: block;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-text-light);
  white-space: nowrap;
}

.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-gold);
  white-space: nowrap;
}

.site-nav { display: block; }

.nav-list { display: flex; gap: 4px; }

.nav-link {
  display: inline-block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: rgba(245, 239, 224, 0.9);
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  background: rgba(212, 175, 55, 0.14);
  color: var(--color-gold);
}

.nav-link[aria-current="page"] { background: var(--color-gold); color: var(--color-black); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px;
  color: var(--color-text-light);
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
}

.nav-toggle-line {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
}

.header-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  will-change: transform;
}

.nav-scrim { display: none; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 195;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .nav-scrim[data-open="true"] { opacity: 1; pointer-events: auto; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 205;
    width: min(78vw, 380px);
    height: 100vh;
    padding: calc(var(--header-height) + 24px) 24px 24px;
    background: var(--color-black);
    transform: translateX(102%);
    transition: transform 0.35s ease;
    overflow-y: auto;
  }

  .site-nav[data-open="true"] { transform: translateX(0); }

  .nav-list { flex-direction: column; gap: 2px; }

  .nav-link {
    display: block;
    padding: 16px;
    font-size: 18px;
    border-bottom: 1px solid rgba(245, 239, 224, 0.08);
    clip-path: none;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    background: rgba(212, 175, 55, 0.12);
    color: var(--color-gold);
  }
}

@media (max-width: 560px) {
  .brand-sub { display: none; }
}

@media (max-width: 380px) {
  .header-actions .btn { display: none; }
  .nav-toggle-text { display: none; }
}

.site-footer {
  position: relative;
  background: var(--color-black);
  color: rgba(245, 239, 224, 0.8);
}

.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: repeating-linear-gradient(135deg, var(--color-gold) 0 12px, var(--color-primary) 12px 24px);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: clamp(24px, 5vw, 64px);
  padding-block: clamp(48px, 8vw, 88px) 40px;
}

.footer-brand { display: grid; gap: 16px; }

.brand-lockup--footer .brand-word { color: var(--color-text-light); }
.brand-lockup--footer .brand-sub { color: var(--color-gold); }

.footer-brief {
  max-width: 340px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(245, 239, 224, 0.65);
}

.footer-title {
  margin-bottom: 18px;
  padding-left: 10px;
  border-left: 3px solid var(--color-gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.footer-links li + li { margin-top: 10px; }

.footer-links a {
  color: rgba(245, 239, 224, 0.82);
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-links a:hover { color: var(--color-gold); }

.footer-contact { margin-top: 18px; display: grid; gap: 8px; }

.footer-contact li {
  font-size: 13px;
  color: rgba(245, 239, 224, 0.68);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 20px;
  border-top: 1px solid rgba(245, 239, 224, 0.12);
}

.footer-copy, .footer-icp, .footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(245, 239, 224, 0.68);
}

.footer-legal a { color: rgba(245, 239, 224, 0.82); }
.footer-legal a:hover { color: var(--color-gold); }

@media (max-width: 860px) {
  .footer-main { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .footer-main { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.001s !important;
    animation-duration: 0.001s !important;
  }
  .js-reveal [data-reveal] { transition: none; }
}