:root {
  --pine: #1b4a3c;
  --pine-d: #0e2f26;
  --pine-m: #2f6a56;
  --ink: #14221c;
  --muted: #5d6e66;
  --paper: #f3efe6;
  --sheet: #e7efe9;
  --foot: #f7f8f8;
  --max: 1100px;
  --foot-min: 1180px;
  --side-l: 212px;
  --side-r: 168px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 13px;
  line-height: 1.8;
  font-weight: 400;
}
img { max-width: 100%; height: auto; border: 0; vertical-align: middle; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
ul { margin: 0; padding: 0; list-style: none; }

.paper-tex {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 80;
  opacity: 0.22;
  mix-blend-mode: multiply;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E"),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(14,47,38,0.03) 24px);
}

.btn,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border: 0;
  border-radius: 0;
  background: var(--pine);
  color: #f3efe6;
  letter-spacing: 0.08em;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}
.btn-ghost { background: var(--pine-d); color: #dce8e1; }
.btn-ink { background: var(--ink); color: #f3efe6; }

.side-left {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--side-l);
  z-index: 40;
  background: var(--pine-d);
  color: #e7efe9;
  overflow: auto;
  padding: 22px 18px 28px;
}
.side-left .logo { display: block; margin-bottom: 28px; }
.side-left .logo img { width: 118px; display: block; }
.side-nav a,
.side-nav summary {
  display: block;
  padding: 7px 0;
  font-size: 13px;
  font-weight: 600;
  color: #d5e4dc;
  cursor: pointer;
}
.side-nav a:hover,
.side-nav summary:hover { color: #fff; }
.side-nav details { margin: 4px 0; }
.side-nav details a { padding-left: 12px; font-weight: 400; color: #9db5aa; }
.side-nav summary { list-style: none; }
.side-nav summary::-webkit-details-marker { display: none; }
.side-cta { margin-top: 22px; display: flex; flex-direction: column; gap: 8px; }
.side-cta .link { color: #c5d8ce; font-size: 12px; font-weight: 600; }
.menu-toggle {
  display: none;
  position: fixed;
  right: 16px;
  top: 16px;
  z-index: 50;
  background: var(--pine);
  color: #f3efe6;
  border: 0;
  padding: 8px 12px;
}

.side-right {
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  width: var(--side-r);
  z-index: 30;
  padding: 28px 16px;
  overflow: auto;
}
.side-right h4 {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
  font-weight: 700;
}
.toc a {
  display: block;
  padding: 6px 0;
  color: var(--muted);
  font-size: 12px;
}
.toc a:hover,
.toc a.is-on { color: var(--pine); font-weight: 700; }

.shell { margin: 0 var(--side-r) 0 var(--side-l); }
.wrap { width: var(--max); max-width: calc(100% - 48px); margin: 0 auto; }
.kicker { font-size: 11px; letter-spacing: 0.28em; color: var(--muted); }
.h2 {
  margin: 6px 0 22px;
  font-size: 42px;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.12;
}
.lead { max-width: 560px; color: var(--muted); font-size: 13px; }

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 36px;
  align-items: center;
  min-height: 86vh;
  padding: 48px 40px 56px;
}
.hero-copy .notice {
  display: inline-block;
  margin-bottom: 16px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--pine-m);
}
.hero h1 {
  margin: 0 0 10px;
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.08;
}
.hero .display {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 800;
  color: var(--pine);
}
.hero .sub { margin: 0 0 28px; font-size: 13px; color: var(--muted); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.hero-visual { background: var(--sheet); min-height: 360px; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: top; display: block; min-height: 360px; }

.section { padding: 72px 0; }
.scroll-row {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}
.scroll-card {
  flex: 0 0 260px;
  scroll-snap-align: start;
  background: var(--sheet);
  padding: 0 0 18px;
}
.scroll-card img {
  width: 100%;
  height: 176px;
  object-fit: cover;
  object-position: top;
  display: block;
  background: #c9d6cf;
}
.scroll-card h3 { margin: 14px 16px 6px; font-size: 16px; font-weight: 800; }
.scroll-card p { margin: 0 16px; color: var(--muted); }

.icon-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.icon-cell { background: var(--sheet); padding: 18px 14px; min-height: 118px; }
.icon-cell strong { display: block; margin-bottom: 6px; font-size: 15px; font-weight: 800; }
.icon-cell span { color: var(--muted); }
.more-box { display: none; margin-top: 10px; }
.more-box.is-on { display: grid; }
.fold-btn {
  display: block;
  margin: 20px auto 0;
  background: none;
  border: 0;
  letter-spacing: 0.14em;
  cursor: pointer;
  color: var(--pine);
  font-weight: 700;
}
.oa-banner { width: 100%; max-width: 420px; margin: 0 0 20px; background: var(--sheet); }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--pine-d);
  color: #e7efe9;
}
.stat { padding: 44px 16px; text-align: center; }
.stat b {
  display: block;
  font-size: 48px;
  font-weight: 800;
  letter-spacing: -0.05em;
  color: #fff;
}
.stat span { font-size: 12px; letter-spacing: 0.12em; color: #9db5aa; }

.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.card { padding: 24px; min-height: 160px; background: var(--sheet); }
.card.private { border-radius: 16px; background: #eef4f0; }
.card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 800; }
.card p { margin: 0; color: var(--muted); }
.tile-shot { width: 100%; height: 128px; object-fit: cover; object-position: top; margin-top: 12px; display: block; }

.case-split { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.case-deep { background: var(--sheet); padding: 0 0 22px; }
.case-deep img { width: 100%; height: 220px; object-fit: cover; object-position: top; display: block; }
.case-deep h3 { margin: 16px 16px 8px; font-size: 22px; font-weight: 800; }
.case-deep p { margin: 0 16px; color: var(--muted); }

.duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.duo article { background: var(--sheet); padding: 28px 24px; min-height: 220px; }
.duo h3 { margin: 0 0 8px; font-size: 22px; font-weight: 800; }
.duo p { margin: 0 0 18px; color: var(--muted); }
.platforms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 14px; }
.plat { text-align: center; padding: 14px 8px; background: var(--sheet); font-weight: 700; }

.marquee { overflow: hidden; padding: 16px 0 0; }
.track { display: flex; gap: 10px; width: max-content; animation: marquee 90s linear infinite; }
.quote-card {
  flex: 0 0 228px;
  padding: 16px;
  background: var(--sheet);
  font-size: 13px;
  color: var(--muted);
}
.quote-card strong { display: block; margin-top: 10px; color: var(--pine); font-size: 12px; }
@keyframes marquee { to { transform: translateX(-50%); } }

.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.faq-card { background: var(--sheet); padding: 20px 18px; }
.faq-card h3 { margin: 0 0 8px; font-size: 15px; font-weight: 800; }
.faq-card p { margin: 0; color: var(--muted); }

.article { max-width: 740px; }
.article p { margin: 0 0 16px; color: var(--muted); font-size: 13px; }
.article h2 { margin: 26px 0 10px; font-size: 28px; font-weight: 800; }
.crumbs { padding: 28px 0 0; font-size: 12px; color: var(--muted); }
.page-hero { padding: 12px 0 28px; }
.page-hero h1 { margin: 8px 0 12px; font-size: 36px; font-weight: 800; letter-spacing: -0.03em; line-height: 1.15; }

.site-foot {
  background: var(--foot);
  min-width: var(--foot-min);
  padding: 36px 0 28px;
  color: #6a6560;
  margin-left: var(--side-l);
}
.foot-inner { width: var(--foot-min); max-width: calc(100% - 40px); margin: 0 auto; }
.foot-nav { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.foot-nav h4 { margin: 0 0 8px; color: var(--ink); font-size: 13px; font-weight: 800; }
.foot-nav a { display: block; padding: 3px 0; font-size: 13px; }
.legal { margin-top: 22px; font-size: 12px; color: #828282; max-width: 820px; }

@media (max-width: 1180px) {
  .site-foot, .foot-inner { min-width: 0; width: 100%; }
  .side-right { display: none; }
  .shell { margin-right: 0; }
}
@media (max-width: 930px) {
  .hero { grid-template-columns: 1fr; min-height: 0; padding: 32px 20px; }
  .hero h1 { font-size: 32px; }
  .h2 { font-size: 30px; }
  .cards-3, .case-split, .duo, .faq-grid { grid-template-columns: 1fr; }
  .icon-grid, .platforms, .stats { grid-template-columns: 1fr 1fr; }
  .foot-nav { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 770px) {
  .menu-toggle { display: inline-flex; }
  .side-left { transform: translateX(-110%); }
  .side-left.is-open { transform: translateX(0); }
  .shell, .site-foot { margin-left: 0; }
}