:root {
  --navy: #1e3a5f;
  --navy-d: #0f243d;
  --navy-l: #c5d4e8;
  --ink: #122033;
  --muted: #5d6d80;
  --paper: #f3f5f8;
  --max: 1100px;
  --foot-min: 1180px;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 16% 10%, rgba(30, 58, 95, 0.12), transparent 42%),
    radial-gradient(circle at 88% 82%, rgba(197, 212, 232, 0.55), transparent 46%),
    var(--paper);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
}
h1, h2, h3, .h2 { font-family: var(--serif); font-weight: 700; }
img { max-width: 100%; height: auto; border: 0; vertical-align: middle; }
a { color: inherit; text-decoration: none; }
button, input { font-family: inherit; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap { width: var(--max); max-width: calc(100% - 40px); margin: 0 auto; position: relative; z-index: 1; }
.kicker { font-size: 12px; letter-spacing: 0.2em; color: var(--navy); }
.h2 { margin: 8px 0 18px; font-size: 28px; }
.lead { max-width: 640px; color: var(--muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid rgba(255,255,255,0.45);
  border-radius: 12px;
  background: rgba(255,255,255,0.28);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--navy-d);
  cursor: pointer;
  font-weight: 700;
  box-shadow: 0 10px 28px rgba(15, 36, 61, 0.12);
}
.btn-solid {
  background: rgba(15, 36, 61, 0.82);
  color: #fff;
  border-color: transparent;
}

.index-top { position: absolute; top: 0; left: 0; z-index: 40; width: 100%; }
.top-inner {
  width: var(--max);
  max-width: calc(100% - 40px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
}
.logo img { width: 118px; display: block; }
.nav-mid { display: flex; gap: 16px; align-items: center; font-size: 13px; flex: 1; justify-content: center; }
.nav-mid > a { white-space: nowrap; }
.drop { position: relative; }
.drop summary { list-style: none; cursor: pointer; }
.drop summary::-webkit-details-marker { display: none; }
.mega {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%);
  min-width: 220px; background: rgba(255,255,255,0.88); backdrop-filter: blur(16px);
  padding: 12px; border-radius: 14px; box-shadow: 0 16px 36px rgba(15,36,61,0.14);
  display: none; z-index: 50;
}
.drop[open] .mega { display: grid; gap: 4px; }
.mega a { display: block; padding: 6px 8px; border-radius: 8px; }
.mega a:hover { background: var(--navy-l); }
.top-cta { margin-left: auto; display: flex; gap: 10px; align-items: center; font-size: 12px; }
.top-cta .btn { min-height: 34px; padding: 0 14px; }

.side-nav {
  position: fixed; left: 14px; top: 50%; transform: translateY(-50%); z-index: 70;
  display: flex; flex-direction: column; gap: 0;
  writing-mode: vertical-rl;
  background: rgba(255,255,255,0.42);
  backdrop-filter: blur(12px);
  padding: 16px 10px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.5);
}
.side-nav a { padding: 8px 0; font-size: 12px; color: var(--navy-d); }

.hero {
  position: relative;
  min-height: 100vh;
  padding: 140px 0 80px;
  overflow: hidden;
  background: linear-gradient(180deg, #1e3a5f, #3a5a82);
}
.globe { position: absolute; left: 50%; top: 6%; width: 760px; height: 760px; margin-left: -380px; opacity: 0.22; z-index: 1; }
.spin { transform-origin: 200px 200px; animation: spin 50s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.hero-mask { position: absolute; inset: 0; z-index: 2; background: radial-gradient(ellipse at 50% 40%, rgba(15,36,61,0.1), rgba(15,36,61,0.45)); }
.hero-inner { position: relative; z-index: 3; }
.glass-card {
  max-width: 640px;
  padding: 36px 34px;
  background: rgba(255,255,255,0.18);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(255,255,255,0.38);
  border-radius: 18px;
  color: #f4f7fb;
}
.float-banner {
  display: inline-block; margin-bottom: 14px; padding: 6px 12px;
  background: rgba(255,255,255,0.2); border: 1px solid rgba(255,255,255,0.35);
  border-radius: 999px; font-size: 12px;
}
.hero h1 { margin: 0 0 10px; font-size: 48px; line-height: 1.18; color: #fff; }
.hero .sub { margin: 0 0 22px; font-size: 17px; color: rgba(244,247,251,0.88); font-family: var(--sans); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.hero .btn { color: var(--navy-d); background: rgba(255,255,255,0.55); }
.hero .btn-solid { color: #fff; background: rgba(15,36,61,0.7); }

.section { padding: 84px 0; position: relative; z-index: 1; }
.sell-row { overflow: hidden; margin-left: -6.88%; }
.sell-item { float: left; width: 18.11%; margin-left: 6.88%; text-align: center; }
.illust { width: 200px; height: 176px; margin: 0 auto 12px; object-fit: cover; display: block; background: var(--navy-l); border-radius: 12px; }
.sell-item h3 { margin: 0 0 6px; font-size: 16px; }
.sell-item p { margin: 0; text-align: left; color: var(--muted); font-size: 13px; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: stretch; }
.compare-col {
  padding: 22px;
  background: rgba(255,255,255,0.55);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(30,58,95,0.1);
  border-radius: 16px;
}
.compare-col img { width: 100%; height: 180px; object-fit: cover; border-radius: 12px; margin-bottom: 12px; }
.compare-col h3 { margin: 0 0 8px; font-size: 20px; }
.compare-col p { margin: 0 0 10px; color: var(--muted); }

.icon-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.icon-cell {
  padding: 18px 14px; min-height: 112px;
  background: rgba(255,255,255,0.62); backdrop-filter: blur(10px);
  border-radius: 14px; border: 1px solid rgba(30,58,95,0.08);
}
.icon-cell strong { display: block; margin-bottom: 6px; }
.icon-cell span { color: var(--muted); font-size: 13px; }
.more-box { display: none; margin-top: 10px; }
.more-box.is-on { display: grid; }
.fold-btn {
  display: block; margin: 20px auto 0; cursor: pointer;
  background: rgba(255,255,255,0.45); backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.6); border-radius: 12px;
  padding: 10px 20px; color: var(--navy-d);
}
.oa-banner { width: 100%; max-width: 460px; margin: 0 0 22px; border-radius: 14px; background: var(--navy-d); }

.spark-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.spark-card {
  padding: 18px 16px;
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(10px);
  border-radius: 14px;
}
.spark-card strong { display: block; font-size: 22px; font-family: var(--serif); }
.spark-card span { color: var(--muted); font-size: 13px; }
.spark { width: 100%; height: 48px; margin-top: 8px; display: block; }

.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.card {
  padding: 22px; min-height: 160px;
  background: rgba(255,255,255,0.7); backdrop-filter: blur(10px); border-radius: 14px;
}
.card.private { border-radius: 16px; border: 1px solid rgba(18,32,51,0.12); background: #fff; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.tile-shot { width: 100%; height: 128px; object-fit: cover; object-position: top; margin-top: 12px; border-radius: 10px; }

.vgrid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.vthumb { position: relative; overflow: hidden; border-radius: 12px; }
.vthumb img { width: 100%; height: 140px; object-fit: cover; display: block; }
.play {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%);
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.55); backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center; font-size: 12px; color: var(--navy-d);
}
.vthumb p { margin: 8px 0 0; font-size: 13px; color: var(--muted); }

.marquee { overflow: hidden; padding: 12px 0; }
.track { display: flex; gap: 10px; width: max-content; animation: marquee 90s linear infinite; }
.quote-card {
  flex: 0 0 228px; padding: 16px;
  background: rgba(255,255,255,0.75); backdrop-filter: blur(8px);
  font-size: 13px; color: var(--muted); border-radius: 12px;
}
.quote-card strong { display: block; margin-top: 10px; color: var(--ink); font-size: 12px; }
@keyframes marquee { to { transform: translateX(-50%); } }

.calc {
  padding: 24px;
  background: rgba(255,255,255,0.6);
  backdrop-filter: blur(14px);
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.55);
}
.calc input[type="range"] { width: 100%; accent-color: var(--navy); }
.calc-out { margin-top: 16px; display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center; }
.platforms { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 22px; }
.plat {
  text-align: center; padding: 14px 8px;
  background: rgba(255,255,255,0.7); border-radius: 12px;
}

.faq-layout { display: grid; grid-template-columns: 220px 1fr; gap: 28px; }
.faq-toc { position: sticky; top: 24px; align-self: start; }
.faq-toc a {
  display: block; padding: 8px 0; font-size: 13px; color: var(--muted);
  border-left: 2px solid transparent; padding-left: 10px;
}
.faq-toc a:hover { color: var(--navy); border-left-color: var(--navy); }
.faq-block { padding: 8px 0 22px; border-bottom: 1px solid rgba(30,58,95,0.12); }
.faq-block h3 { margin: 0 0 8px; font-size: 18px; }
.faq-block p { margin: 0; color: var(--muted); }

.article { max-width: 740px; }
.article p { margin: 0 0 16px; color: var(--muted); }
.article h2 { margin: 26px 0 10px; font-size: 22px; }
.crumbs { padding: 88px 0 0; font-size: 12px; color: var(--muted); }
.page-hero { padding: 18px 0 36px; }
.page-hero h1 { margin: 8px 0 12px; font-size: 32px; }
body.sub .index-top { position: relative; background: rgba(243,245,248,0.92); backdrop-filter: blur(12px); }
body.sub .crumbs { padding-top: 12px; }
body.sub .hero { min-height: 0; padding: 40px 0; }

.site-foot { background: #f7f8f8; min-width: var(--foot-min); padding: 40px 0 24px; color: #6a6560; }
.foot-inner { width: var(--foot-min); max-width: calc(100% - 40px); margin: 0 auto; }
.foot-dual { display: grid; grid-template-columns: 280px 1fr; gap: 36px; }
.foot-brand p { font-size: 13px; color: #6a6560; }
.foot-brand img { width: 120px; margin-bottom: 10px; }
.foot-nav { display: flex; justify-content: space-between; gap: 16px; text-align: left; }
.foot-nav h4 { margin: 0 0 8px; color: var(--ink); font-size: 13px; font-family: var(--serif); }
.foot-nav a { display: block; padding: 3px 0; font-size: 13px; }
.legal { font-size: 12px; color: #828282; margin-top: 18px; }

@media (max-width: 1180px) { .site-foot, .foot-inner { min-width: 0; width: 100%; } }
@media (max-width: 930px) {
  .hero h1 { font-size: 32px; }
  .cards-3, .spark-grid, .vgrid { grid-template-columns: 1fr 1fr; }
  .sell-item { width: 43%; margin-bottom: 22px; }
  .icon-grid, .platforms { grid-template-columns: 1fr 1fr; }
  .compare, .faq-layout, .foot-dual { grid-template-columns: 1fr; }
  .nav-mid, .side-nav { display: none; }
  .faq-toc { position: static; }
  .foot-nav { flex-wrap: wrap; }
}
@media (max-width: 770px) {
  .sell-item { width: 100%; margin-left: 0; }
  .sell-row { margin-left: 0; }
  .cards-3, .spark-grid, .vgrid { grid-template-columns: 1fr; }
}