/* 蛇之交响曲 · 琥珀蛇纹 fantasy-tech 视觉方向 */
/* 主色: #0f1722 #13253f #1e3a5f #e5c36a #f28f3b #7ae7d7 */
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans SC', system-ui, sans-serif;
  background: #0f1722;
  color: #eef3f8;
}
.heading-display {
  font-family: 'Noto Sans SC', system-ui, sans-serif;
  font-weight: 900;
  letter-spacing: .08em;
}
.serpent-grid {
  background-image:
    linear-gradient(to right, rgba(122,231,215,0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(122,231,215,0.06) 1px, transparent 1px);
  background-size: 34px 34px;
}
.serpent-orb {
  background:
    radial-gradient(circle at 30% 30%, rgba(242,143,59,0.45), transparent 45%),
    radial-gradient(circle at 70% 40%, rgba(122,231,215,0.35), transparent 42%),
    radial-gradient(circle at 50% 80%, rgba(229,195,106,0.18), transparent 38%);
}
.serpent-stripe {
  background: repeating-linear-gradient(135deg, #e5c36a 0 10px, #0f1722 10px 20px);
}
.btn-amber {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #f9dd8b 0%, #e5c36a 48%, #d28b2d 100%);
  color: #0f1722;
  font-weight: 900;
  border: 2px solid #b77428;
  box-shadow: 0 16px 34px -14px rgba(242,143,59,0.72), inset 0 1px 0 rgba(255,255,255,0.45);
  transition: transform .18s ease, filter .2s ease;
}
.btn-amber:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn-amber:active { transform: translateY(0); }
.btn-amber::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 34%;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,.8), transparent);
  filter: blur(3px);
  animation: shine 2.5s linear infinite;
  pointer-events: none;
}
.btn-outline {
  background: rgba(15,23,34,0.8);
  color: #eef3f8;
  border: 1.5px solid rgba(122,231,215,0.4);
  backdrop-filter: blur(8px);
}
.btn-outline:hover {
  border-color: #e5c36a;
  color: #e5c36a;
}
.panel-dark {
  background: linear-gradient(180deg, rgba(19,37,63,.96), rgba(15,23,34,.98));
  border: 1px solid rgba(122,231,215,0.18);
  box-shadow: 0 18px 42px -28px rgba(0,0,0,0.85);
}
.panel-light {
  background: #f8f4ea;
  border: 1px solid #e5ddca;
  color: #1f2a37;
  box-shadow: 0 16px 32px -24px rgba(15,23,34,0.28);
}
.nav-link { position: relative; color: #d4deea; }
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: linear-gradient(90deg, #e5c36a, #f28f3b);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }
.nav-link:hover, .nav-link.active { color: #f6d97b; }
.hero-badge {
  border-left: 3px solid #f28f3b;
  background: linear-gradient(90deg, rgba(242,143,59,0.2), rgba(15,23,34,0.55));
}
.stat-chip {
  background: rgba(15,23,34,0.75);
  border: 1px solid rgba(229,195,106,0.3);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.show {
  opacity: 1;
  transform: translateY(0);
}
.lb-overlay { background: rgba(8,12,20,.94); }
.lb-img { max-height: 86vh; max-width: 92vw; object-fit: contain; }
details > summary { list-style: none; cursor: pointer; }
details > summary::-webkit-details-marker { display: none; }
.acc-icon { transition: transform .25s ease; }
details[open] .acc-icon { transform: rotate(45deg); }
#mobileMenu { transition: max-height .3s ease; max-height: 0; overflow: hidden; }
#mobileMenu.open { max-height: 520px; }
#siteHeader {
  background: rgba(15,23,34,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
[data-gallery-filter] {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(122,231,215,.18);
}
[data-gallery-filter].is-active {
  background: #e5c36a;
  color: #0f1722;
  border-color: #e5c36a;
  font-weight: 900;
}
table.toc-table th, table.toc-table td {
  border: 1px solid #c9d1db;
  padding: .7rem .85rem;
}
table.toc-table thead th {
  background: #13253f;
  color: #f6d97b;
  text-align: left;
  font-weight: 900;
}
table.toc-table tbody tr:nth-child(even) { background: #fffdfa; }
.toc a.active { color: #d28b2d; border-color: #d28b2d; }
.feature-card:hover,
.lift-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 44px -28px rgba(15,23,34,.72);
}
.feature-card,
.lift-card {
  transition: transform .2s ease, box-shadow .2s ease;
}
.hero-scrim-left {
  background: linear-gradient(110deg,
    rgba(15,23,34,1) 0%,
    rgba(15,23,34,.98) 40%,
    rgba(15,23,34,.76) 64%,
    rgba(15,23,34,.35) 82%,
    transparent 100%);
}
.hero-text-panel {
  background: rgba(15,23,34,.9);
  border: 1px solid rgba(122,231,215,.12);
  box-shadow: 0 30px 60px -30px rgba(0,0,0,.85);
}
.hero-title,
.hero-lead,
.hero-meta {
  text-shadow: 0 2px 18px rgba(0,0,0,.7);
}
.floating-ring {
  box-shadow: 0 0 0 1px rgba(122,231,215,.18), inset 0 0 0 1px rgba(255,255,255,.05);
}
.texture-dots {
  background-image: radial-gradient(rgba(229,195,106,0.18) 1px, transparent 1px);
  background-size: 18px 18px;
}
@keyframes shine {
  0% { transform: translateX(-120%) skewX(-20deg); }
  100% { transform: translateX(220%) skewX(-20deg); }
}
@media (max-width: 1023px) {
  .hero-scrim-left {
    background: linear-gradient(180deg,
      rgba(15,23,34,.97) 0%,
      rgba(15,23,34,.9) 55%,
      rgba(15,23,34,.72) 100%);
  }
  .hero-text-panel { background: rgba(15,23,34,.95); }
}