/* ============================================================
   Onyx Spire — Gen2 主题 CSS
   ============================================================ */

:root {
  --os-accent: #c8a96e;
  --os-bg: #0d0f14;
  --os-bg-soft: #161922;
  --os-bg-card: #1c1f2a;
  --os-text: #e0e2ea;
  --os-text-muted: #8b8fa0;
  --os-border: rgba(255,255,255,.08);
  --os-radius: 10px;
  --os-wrap: 1200px;
  --os-gap: 1.5rem;
  --os-transition: .25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--os-bg);
  color: var(--os-text);
  line-height: 1.7;
}

a { color: var(--os-accent); text-decoration: none; transition: color var(--os-transition); }
a:hover { color: #e0c88a; }
img { max-width: 100%; height: auto; display: block; }

.os-wrap { max-width: var(--os-wrap); margin: 0 auto; padding: 0 1.25rem; }
.container { max-width: var(--os-wrap); margin: 0 auto; padding: 0 1.25rem; }

/* — Buttons — */
.os-btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .65rem 1.5rem; border-radius: var(--os-radius);
  font-size: .9rem; font-weight: 600; cursor: pointer;
  transition: all var(--os-transition); border: 1.5px solid transparent;
  text-decoration: none;
}
.os-btn--accent { background: var(--os-accent); color: #000; }
.os-btn--accent:hover { background: #e0c88a; color: #000; }
.os-btn--ghost { border-color: var(--os-border); color: var(--os-text); background: transparent; }
.os-btn--ghost:hover { border-color: var(--os-accent); color: var(--os-accent); }
.os-btn--light { border-color: rgba(255,255,255,.3); color: #fff; }
.os-btn--xs { padding: .4rem 1rem; font-size: .8rem; }

/* — Topbar — */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(13,15,20,.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--os-border);
}
.topbar-inner { display: flex; justify-content: space-between; align-items: center; height: 64px; }
.brand { display: flex; align-items: center; gap: .75rem; color: #fff; text-decoration: none; }
.logo-img { width: 42px; height: 42px; border-radius: 8px; }
.brand-title { font-size: 1.15rem; font-weight: 700; }
.brand-sub { font-size: .7rem; color: var(--os-text-muted); }
.nav { display: flex; gap: 1.5rem; }
.nav a { color: var(--os-text-muted); font-size: .9rem; font-weight: 500; }
.nav a:hover { color: var(--os-accent); }

/* — Cinema (Hero) — */
.os-nexus__cinema {
  position: relative; min-height: 70vh;
  display: flex; align-items: center; overflow: hidden;
}
.os-nexus__cinema-bg { position: absolute; inset: 0; }
.os-nexus__cinema-bg img { width: 100%; height: 100%; object-fit: cover; }
.os-nexus__cinema-veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(13,15,20,.6) 0%, rgba(13,15,20,.9) 100%);
}
.os-nexus__cinema-inner { position: relative; z-index: 1; padding: 6rem 0 4rem; }
.os-nexus__cinema-kicker {
  display: inline-flex; align-items: center; gap: .5rem;
  font-size: .85rem; color: var(--os-accent); margin-bottom: 1rem;
}
.os-nexus__cinema-pulse {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--os-accent); animation: osPulse 2s infinite;
}
@keyframes osPulse { 0%,100% { opacity: 1; } 50% { opacity: .3; } }
.os-nexus__cinema-title { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; line-height: 1.2; margin-bottom: 1rem; }
.os-nexus__cinema-lede { font-size: 1.05rem; color: var(--os-text-muted); max-width: 700px; margin-bottom: 2rem; }
.os-nexus__cinema-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2.5rem; }
.os-nexus__cinema-dock { display: flex; gap: 2.5rem; list-style: none; }
.os-nexus__cinema-dock li { text-align: center; }
.os-nexus__cinema-dock strong { display: block; font-size: 1.3rem; color: var(--os-accent); }
.os-nexus__cinema-dock span { font-size: .75rem; color: var(--os-text-muted); }

/* — Section Heading — */
.os-nexus__sec-h {
  font-size: 1.6rem; font-weight: 700; margin-bottom: 2rem;
  position: relative; padding-left: 1rem;
}
.os-nexus__sec-h::before {
  content: ''; position: absolute; left: 0; top: .15em;
  width: 4px; height: 1.2em; background: var(--os-accent); border-radius: 2px;
}
.os-nexus__sec-h--light { color: #fff; }

/* — Deck — */
.os-nexus__deck { padding: 3rem 0; }
.os-nexus__deck-grid { display: grid; grid-template-columns: 320px 1fr; gap: var(--os-gap); }
.os-nexus__deck-signal { background: var(--os-bg-card); border-radius: var(--os-radius); padding: 1.5rem; }
.os-nexus__deck-signal-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.os-nexus__deck-signal-head h2 { font-size: 1rem; font-weight: 600; }
.os-nexus__deck-signal-list { list-style: none; }
.os-nexus__deck-signal-row { display: flex; align-items: flex-start; gap: .6rem; padding: .75rem 0; border-bottom: 1px solid var(--os-border); color: var(--os-text); text-decoration: none; }
.os-nexus__deck-signal-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--os-accent); flex-shrink: 0; margin-top: .5em; }
.os-nexus__deck-signal-t { flex: 1; font-size: .85rem; line-height: 1.5; }
.os-nexus__deck-signal-row time { font-size: .7rem; color: var(--os-text-muted); white-space: nowrap; }
.os-nexus__deck-cover { position: relative; border-radius: var(--os-radius); overflow: hidden; }
.os-nexus__deck-cover-media img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.os-nexus__deck-cover-copy { position: absolute; bottom: 0; left: 0; right: 0; padding: 1.5rem; background: linear-gradient(transparent, rgba(0,0,0,.85)); }
.os-nexus__deck-cover-badge { display: inline-block; background: var(--os-accent); color: #000; font-size: .7rem; padding: .2rem .6rem; border-radius: 4px; margin-bottom: .5rem; }
.os-nexus__deck-cover-copy h2 { font-size: 1.1rem; }
.os-nexus__deck-cover-copy h2 a { color: #fff; }
.os-nexus__deck-queue { list-style: none; margin-top: 1rem; }
.os-nexus__deck-queue-row { display: flex; align-items: center; gap: .8rem; padding: .6rem 0; border-bottom: 1px solid var(--os-border); color: var(--os-text); text-decoration: none; }
.os-nexus__deck-queue-n { font-size: 1.4rem; font-weight: 800; color: var(--os-accent); min-width: 2rem; }
.os-nexus__deck-queue-t { font-size: .85rem; }

/* — Lattice — */
.os-nexus__lattice { padding: 4rem 0; background: var(--os-bg-soft); }
.os-nexus__lattice-hls { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--os-gap); margin-bottom: 2.5rem; }
.os-nexus__lattice-hl { text-align: center; padding: 1.5rem; background: var(--os-bg-card); border-radius: var(--os-radius); }
.os-nexus__lattice-hl-n { display: block; font-size: 2rem; font-weight: 800; color: var(--os-accent); }
.os-nexus__lattice-photos { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--os-gap); margin-bottom: 2.5rem; }
.os-nexus__lattice-photo img { border-radius: var(--os-radius); aspect-ratio: 4/3; object-fit: cover; }
.os-nexus__lattice-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: var(--os-gap); margin-bottom: 2.5rem; }
.os-nexus__lattice-card { background: var(--os-bg-card); padding: 1.5rem; border-radius: var(--os-radius); border: 1px solid var(--os-border); transition: border-color var(--os-transition); }
.os-nexus__lattice-card:hover { border-color: var(--os-accent); }
.os-nexus__lattice-card--wide { grid-column: span 2; }
.os-nexus__lattice-card h3 { font-size: .95rem; margin-bottom: .5rem; }
.os-nexus__lattice-card p { font-size: .85rem; color: var(--os-text-muted); }
.os-nexus__lattice-nav { display: flex; gap: .75rem; flex-wrap: wrap; }
.os-nexus__lattice-link {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .5rem 1.2rem; background: var(--os-bg-card); border-radius: var(--os-radius);
  color: var(--os-text); font-size: .85rem; border: 1px solid var(--os-border); text-decoration: none;
}
.os-nexus__lattice-link span { color: var(--os-accent); font-weight: 700; }
.os-nexus__lattice-link--dl { background: var(--os-accent); color: #000; border-color: var(--os-accent); }
.os-nexus__lattice-link--dl span { color: #000; }

/* — River — */
.os-nexus__river { padding: 4rem 0; }
.os-nexus__river-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.os-nexus__river-row { display: grid; grid-template-columns: 420px 1fr; gap: 2rem; margin-bottom: 3rem; align-items: center; }
.os-nexus__river-row--flip { direction: rtl; }
.os-nexus__river-row--flip > * { direction: ltr; }
.os-nexus__river-media img { border-radius: var(--os-radius); aspect-ratio: 16/10; object-fit: cover; width: 100%; }
.os-nexus__river-kicker { font-size: .75rem; color: var(--os-accent); font-weight: 600; text-transform: uppercase; }
.os-nexus__river-tag { display: inline-block; background: var(--os-accent); color: #000; font-size: .7rem; padding: .15rem .5rem; border-radius: 3px; }
.os-nexus__river-copy h3 { font-size: 1.15rem; margin: .5rem 0; }
.os-nexus__river-copy h3 a { color: var(--os-text); }
.os-nexus__river-copy h3 a:hover { color: var(--os-accent); }
.os-nexus__river-copy time { font-size: .75rem; color: var(--os-text-muted); }
.os-nexus__river-copy p { font-size: .85rem; color: var(--os-text-muted); margin: .75rem 0; }

/* — Flare — */
.os-nexus__flare { padding: 3.5rem 0; background: var(--os-bg-soft); }
.os-nexus__flare-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
.os-nexus__flare-track { display: grid; gap: .75rem; }
.os-nexus__flare-card {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.2rem 1.5rem; background: var(--os-bg-card); border-radius: var(--os-radius);
  border: 1px solid var(--os-border); text-decoration: none; color: var(--os-text);
  transition: all var(--os-transition);
}
.os-nexus__flare-card:hover { border-color: var(--os-accent); transform: translateX(4px); }
.os-nexus__flare-rank { font-size: 1.8rem; font-weight: 800; color: var(--os-accent); min-width: 2.5rem; }
.os-nexus__flare-card strong { font-size: .9rem; flex: 1; }
.os-nexus__flare-bar { width: 40px; height: 3px; background: linear-gradient(90deg, var(--os-accent), transparent); border-radius: 2px; }

/* — Trust — */
.os-nexus__trust { padding: 4rem 0; }
.os-nexus__trust-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--os-gap); }
.os-nexus__trust-card { background: var(--os-bg-card); padding: 1.5rem; border-radius: var(--os-radius); border-left: 3px solid var(--os-accent); }
.os-nexus__trust-card h3 { font-size: .95rem; margin-bottom: .5rem; }
.os-nexus__trust-card p { font-size: .85rem; color: var(--os-text-muted); }

/* — FAQ — */
.os-nexus__faq { padding: 4rem 0; background: var(--os-bg-soft); }
.os-nexus__faq-panel { max-width: 800px; }
.os-nexus__faq-item { border-bottom: 1px solid var(--os-border); }
.os-nexus__faq-item summary {
  padding: 1rem 0; cursor: pointer; font-weight: 600; font-size: .95rem;
  list-style: none; display: flex; align-items: center; gap: .5rem;
}
.os-nexus__faq-item summary::before { content: '+'; color: var(--os-accent); font-size: 1.2rem; min-width: 1.2rem; }
.os-nexus__faq-item[open] summary::before { content: '−'; }
.os-nexus__faq-item p { padding: 0 0 1rem 1.7rem; font-size: .9rem; color: var(--os-text-muted); }

/* — Chips — */
.os-nexus__chips { padding: 2rem 0; border-top: 1px solid var(--os-border); }
.os-nexus__chips-inner { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; }
.os-nexus__chips-inner a {
  padding: .4rem 1rem; background: var(--os-bg-card); border: 1px solid var(--os-border);
  border-radius: 20px; font-size: .8rem; color: var(--os-text-muted);
}
.os-nexus__chips-inner a:hover { border-color: var(--os-accent); color: var(--os-accent); }

/* — CTA — */
.os-nexus__cta { padding: 4rem 0; text-align: center; background: linear-gradient(135deg, var(--os-bg-soft), var(--os-bg)); }
.os-nexus__cta h2 { font-size: 1.8rem; margin-bottom: 1rem; }
.os-nexus__cta p { color: var(--os-text-muted); margin-bottom: 2rem; max-width: 600px; margin-left: auto; margin-right: auto; }
.os-nexus__cta-act { display: flex; gap: 1rem; justify-content: center; }

/* — Footer — */
.footer { padding: 3rem 0 1.5rem; background: var(--os-bg-soft); border-top: 1px solid var(--os-border); }
.footer-panel { display: grid; gap: 2rem; }
.footer-main { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.footer-brand { font-size: 1.4rem; font-weight: 700; color: var(--os-accent); }
.footer-desc { font-size: .85rem; color: var(--os-text-muted); line-height: 1.7; }
.footer-meta-title { font-weight: 600; margin-bottom: .75rem; }
.footer-chip { font-size: .85rem; margin-bottom: .4rem; }
.footer-chip b { color: var(--os-accent); margin-right: .5rem; }
.footer-bottom { text-align: center; padding-top: 2rem; border-top: 1px solid var(--os-border); }
.footer-links { margin-bottom: .75rem; }
.footer-links a { color: var(--os-text-muted); font-size: .8rem; }
.footer-links .sep { color: var(--os-text-muted); margin: 0 .3rem; }
.footer-copy { font-size: .75rem; color: var(--os-text-muted); }

/* — Responsive — */
@media (max-width: 900px) {
  .os-nexus__deck-grid { grid-template-columns: 1fr; }
  .os-nexus__river-row, .os-nexus__river-row--flip { grid-template-columns: 1fr; direction: ltr; }
  .os-nexus__lattice-hls { grid-template-columns: 1fr; }
  .os-nexus__lattice-photos { grid-template-columns: repeat(2, 1fr); }
  .os-nexus__lattice-card--wide { grid-column: span 1; }
  .footer-main { grid-template-columns: 1fr; }
  .os-nexus__cinema-dock { flex-wrap: wrap; gap: 1.5rem; }
}
@media (max-width: 600px) {
  .nav { display: none; }
  .os-nexus__cinema { min-height: 60vh; }
  .os-nexus__cinema-title { font-size: 1.5rem; }
  .os-nexus__lattice-photos { grid-template-columns: 1fr; }
}

/* ============================================================
   补充样式 — 非首页 Sections
   ============================================================ */

/* — Breadcrumb — */
.os-breadcrumb { padding: 1rem 0; border-bottom: 1px solid var(--os-border); }
.os-breadcrumb__list { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; font-size: .85rem; }
.os-breadcrumb__item + .os-breadcrumb__item::before { content: '/'; color: var(--os-text-muted); margin-right: .5rem; }
.os-breadcrumb__item a { color: var(--os-text-muted); }
.os-breadcrumb__item span { color: var(--os-text); }

/* — Article — */
.os-article { padding: 3rem 0; }
.os-article__grid { display: grid; grid-template-columns: 1fr 300px; gap: 3rem; }
.os-article__title { font-size: clamp(1.5rem, 3vw, 2.2rem); margin-bottom: 1rem; }
.os-article__meta { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; margin-bottom: 2rem; font-size: .85rem; color: var(--os-text-muted); }
.os-article__author { display: flex; align-items: center; gap: .5rem; color: var(--os-accent); text-decoration: none; }
.os-article__avatar { width: 32px; height: 32px; border-radius: 50%; }
.os-article__cover { margin-bottom: 2rem; }
.os-article__cover img { border-radius: var(--os-radius); width: 100%; }
.os-article__content { font-size: 1rem; line-height: 1.9; }
.os-article__content h2 { font-size: 1.4rem; margin: 2rem 0 1rem; padding-left: .8rem; border-left: 3px solid var(--os-accent); }
.os-article__content h3 { font-size: 1.15rem; margin: 1.5rem 0 .75rem; }
.os-article__content p { margin-bottom: 1.2rem; }
.os-article__content img { border-radius: var(--os-radius); margin: 1.5rem 0; }
.os-article__tags { display: flex; flex-wrap: wrap; gap: .5rem; padding-top: 2rem; border-top: 1px solid var(--os-border); margin-top: 2rem; }
.os-article__tags-label { color: var(--os-text-muted); font-size: .85rem; }
.os-article__tag { background: var(--os-bg-card); border: 1px solid var(--os-border); padding: .2rem .6rem; border-radius: 4px; font-size: .8rem; }
.os-article__share { display: flex; align-items: center; gap: .75rem; margin-top: 1.5rem; font-size: .85rem; color: var(--os-text-muted); }
.os-article__sidebar { position: sticky; top: 80px; }
.os-article__author-card { background: var(--os-bg-card); padding: 1.5rem; border-radius: var(--os-radius); text-align: center; }
.os-article__author-card img { width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 1rem; }
.os-article__author-card strong { display: block; margin-bottom: .25rem; }
.os-article__author-card small { color: var(--os-text-muted); display: block; margin-bottom: .75rem; }
.os-article__author-card p { font-size: .85rem; color: var(--os-text-muted); margin-bottom: 1rem; }

/* — Article Nav — */
.os-article-nav { padding: 2rem 0; border-top: 1px solid var(--os-border); }
.os-article-nav__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.os-article-nav__link { display: block; padding: 1rem; background: var(--os-bg-card); border-radius: var(--os-radius); border: 1px solid var(--os-border); text-decoration: none; color: var(--os-text); transition: border-color var(--os-transition); }
.os-article-nav__link:hover { border-color: var(--os-accent); }
.os-article-nav__link small { display: block; font-size: .75rem; color: var(--os-accent); margin-bottom: .3rem; }
.os-article-nav__link--next { text-align: right; }

/* — Related — */
.os-related { padding: 3rem 0; border-top: 1px solid var(--os-border); }
.os-related__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--os-gap); }
.os-related__card { background: var(--os-bg-card); border-radius: var(--os-radius); overflow: hidden; }
.os-related__card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.os-related__card h3 { padding: .75rem 1rem .25rem; font-size: .9rem; }
.os-related__card h3 a { color: var(--os-text); }
.os-related__card time { padding: 0 1rem .75rem; display: block; font-size: .75rem; color: var(--os-text-muted); }

/* — Category List — */
.os-catlist { padding: 3rem 0; }
.os-catlist__header { margin-bottom: 2rem; }
.os-catlist__desc { color: var(--os-text-muted); margin-top: .5rem; }
.os-catlist__count { font-size: .85rem; color: var(--os-text-muted); }
.os-catlist__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--os-gap); }
.os-catlist__card { display: grid; grid-template-columns: 200px 1fr; gap: 1rem; background: var(--os-bg-card); border-radius: var(--os-radius); overflow: hidden; border: 1px solid var(--os-border); }
.os-catlist__media img { width: 100%; height: 100%; object-fit: cover; }
.os-catlist__body { padding: 1rem; }
.os-catlist__body h2 { font-size: 1rem; margin-bottom: .5rem; }
.os-catlist__body h2 a { color: var(--os-text); }
.os-catlist__body time { font-size: .75rem; color: var(--os-text-muted); display: block; margin-bottom: .5rem; }
.os-catlist__body p { font-size: .85rem; color: var(--os-text-muted); }
.os-catlist__empty { text-align: center; padding: 4rem 0; color: var(--os-text-muted); }

/* — Pagination — */
.os-pagination { display: flex; justify-content: center; align-items: center; gap: 1rem; padding: 2rem 0; }
.os-pagination__info { font-size: .85rem; color: var(--os-text-muted); }

/* — About Hero — */
.os-about-hero { position: relative; min-height: 40vh; display: flex; align-items: center; overflow: hidden; }
.os-about-hero__bg { position: absolute; inset: 0; }
.os-about-hero__bg img { width: 100%; height: 100%; object-fit: cover; }
.os-about-hero__veil { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(13,15,20,.5), rgba(13,15,20,.85)); }
.os-about-hero__inner { position: relative; z-index: 1; padding: 4rem 0; }
.os-about-hero__inner h1 { font-size: 2.2rem; margin-bottom: .75rem; }
.os-about-hero__inner p { color: var(--os-text-muted); max-width: 600px; }

/* — About Content — */
.os-about-content { padding: 4rem 0; }
.os-about-content__intro { max-width: 800px; margin-bottom: 3rem; font-size: 1.05rem; line-height: 1.9; }
.os-about-content__stats { display: flex; gap: 2.5rem; margin-bottom: 3rem; }
.os-about-content__stat { text-align: center; }
.os-about-content__stat strong { display: block; font-size: 2rem; color: var(--os-accent); }
.os-about-content__team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--os-gap); margin-bottom: 3rem; }
.os-about-content__member { text-align: center; background: var(--os-bg-card); padding: 1.5rem; border-radius: var(--os-radius); }
.os-about-content__member img { width: 80px; height: 80px; border-radius: 50%; margin: 0 auto .75rem; }
.os-about-content__member strong { display: block; }
.os-about-content__member small { color: var(--os-text-muted); }
.os-about-content__milestone { display: flex; gap: 1.5rem; padding: 1rem 0; border-bottom: 1px solid var(--os-border); }
.os-about-content__milestone-year { font-size: 1.3rem; font-weight: 700; color: var(--os-accent); min-width: 5rem; }

/* — Contact — */
.os-contact { padding: 4rem 0; }
.os-contact__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; margin-top: 2rem; }
.os-contact__item { display: flex; gap: .75rem; margin-bottom: 1.25rem; }
.os-contact__item i { font-size: 1.2rem; color: var(--os-accent); margin-top: .2rem; }
.os-contact__item strong { display: block; font-size: .85rem; color: var(--os-text-muted); }
.os-contact__form h2 { margin-bottom: 1.5rem; }
.os-contact__field { margin-bottom: 1.25rem; }
.os-contact__field label { display: block; font-size: .85rem; margin-bottom: .4rem; color: var(--os-text-muted); }
.os-contact__field input,
.os-contact__field textarea { width: 100%; padding: .65rem .9rem; background: var(--os-bg-card); border: 1px solid var(--os-border); border-radius: var(--os-radius); color: var(--os-text); font-size: .9rem; transition: border-color var(--os-transition); }
.os-contact__field input:focus,
.os-contact__field textarea:focus { border-color: var(--os-accent); outline: none; }

/* — App Hero — */
.os-app-hero { padding: 4rem 0; }
.os-app-hero__grid { display: grid; grid-template-columns: 1fr 320px; gap: 3rem; align-items: center; }
.os-app-hero__badge { display: inline-block; background: var(--os-accent); color: #000; font-size: .75rem; padding: .2rem .8rem; border-radius: 20px; margin-bottom: 1rem; }
.os-app-hero__copy h1 { font-size: 2rem; margin-bottom: 1rem; }
.os-app-hero__copy p { color: var(--os-text-muted); margin-bottom: 2rem; }
.os-app-hero__qr { display: flex; gap: 2rem; margin-bottom: 2rem; }
.os-app-hero__qr-item { text-align: center; }
.os-app-hero__qr-item img { border-radius: var(--os-radius); background: #fff; padding: .5rem; }
.os-app-hero__qr-item span { display: block; font-size: .8rem; color: var(--os-text-muted); margin-top: .5rem; }
.os-app-hero__stats { display: flex; gap: 2rem; }
.os-app-hero__stats strong { display: block; font-size: 1.5rem; color: var(--os-accent); }
.os-app-hero__stats span { font-size: .8rem; color: var(--os-text-muted); }
.os-app-hero__device img { border-radius: var(--os-radius); }

/* — App Features — */
.os-app-features { padding: 4rem 0; background: var(--os-bg-soft); }
.os-app-features__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--os-gap); }
.os-app-features__card { background: var(--os-bg-card); padding: 1.5rem; border-radius: var(--os-radius); text-align: center; border: 1px solid var(--os-border); }
.os-app-features__icon { font-size: 2rem; color: var(--os-accent); margin-bottom: .75rem; display: block; }
.os-app-features__card h3 { font-size: .95rem; margin-bottom: .5rem; }
.os-app-features__card p { font-size: .85rem; color: var(--os-text-muted); }

/* — 404 — */
.os-404 { padding: 6rem 0; text-align: center; }
.os-404__code { font-size: 8rem; font-weight: 900; color: var(--os-accent); line-height: 1; }
.os-404__message { font-size: 1.1rem; color: var(--os-text-muted); margin: 1.5rem 0; }
.os-404__actions { margin-bottom: 3rem; }
.os-404__recommend { margin-top: 2rem; }
.os-404__recommend h2 { font-size: 1.1rem; margin-bottom: 1rem; }
.os-404__links { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; }
.os-404__link { padding: .4rem 1rem; background: var(--os-bg-card); border: 1px solid var(--os-border); border-radius: 20px; font-size: .85rem; color: var(--os-text-muted); }

/* — Search — */
.os-search { padding: 3rem 0; }
.os-search__form { display: flex; gap: .75rem; margin: 2rem 0; }
.os-search__input { flex: 1; padding: .7rem 1rem; background: var(--os-bg-card); border: 1px solid var(--os-border); border-radius: var(--os-radius); color: var(--os-text); font-size: 1rem; }
.os-search__input:focus { border-color: var(--os-accent); outline: none; }
.os-search__hot { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; font-size: .85rem; color: var(--os-text-muted); }
.os-search__hot a { padding: .2rem .6rem; background: var(--os-bg-card); border-radius: 4px; font-size: .8rem; }
.os-search__summary { margin: 1.5rem 0; font-size: .9rem; color: var(--os-text-muted); }
.os-search__item { padding: 1.5rem 0; border-bottom: 1px solid var(--os-border); }
.os-search__item h2 { font-size: 1.1rem; margin-bottom: .5rem; }
.os-search__item h2 a { color: var(--os-text); }
.os-search__item p { font-size: .85rem; color: var(--os-text-muted); }
.os-search__item time { font-size: .75rem; color: var(--os-text-muted); }
.os-search__empty { text-align: center; padding: 4rem 0; color: var(--os-text-muted); }

/* — Author — */
.os-author { padding: 3rem 0; }
.os-author__profile { display: flex; gap: 2rem; align-items: center; margin-bottom: 3rem; padding-bottom: 2rem; border-bottom: 1px solid var(--os-border); }
.os-author__avatar { width: 120px; height: 120px; border-radius: 50%; border: 3px solid var(--os-accent); }
.os-author__info h1 { font-size: 1.8rem; margin-bottom: .25rem; }
.os-author__job { color: var(--os-text-muted); font-size: .9rem; }
.os-author__verified { color: var(--os-accent); font-size: .85rem; margin-left: .75rem; }
.os-author__bio { color: var(--os-text-muted); margin-top: .75rem; max-width: 600px; }
.os-author__stats-bar { display: flex; gap: 2rem; margin-top: 1rem; }
.os-author__stats-bar span { font-size: .85rem; color: var(--os-text-muted); }
.os-author__stats-bar strong { color: var(--os-accent); }
.os-author__posts-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--os-gap); }
.os-author__post-card { background: var(--os-bg-card); border-radius: var(--os-radius); overflow: hidden; border: 1px solid var(--os-border); }
.os-author__post-card img { width: 100%; aspect-ratio: 16/10; object-fit: cover; }
.os-author__post-card h3 { padding: .75rem 1rem .25rem; font-size: .9rem; }
.os-author__post-card h3 a { color: var(--os-text); }
.os-author__post-card time { display: block; padding: 0 1rem .75rem; font-size: .75rem; color: var(--os-text-muted); }

/* — Login / Signup — */
.os-login, .os-signup { padding: 4rem 0; display: flex; justify-content: center; }
.os-login__panel, .os-signup__panel { background: var(--os-bg-card); padding: 2.5rem; border-radius: var(--os-radius); width: 100%; max-width: 440px; border: 1px solid var(--os-border); }
.os-login__panel h1, .os-signup__panel h1 { font-size: 1.5rem; margin-bottom: .5rem; text-align: center; }
.os-login__sub, .os-signup__sub { text-align: center; color: var(--os-text-muted); font-size: .9rem; margin-bottom: 2rem; }
.os-login__field, .os-signup__field { margin-bottom: 1.25rem; }
.os-login__field label, .os-signup__field label { display: block; font-size: .85rem; margin-bottom: .4rem; color: var(--os-text-muted); }
.os-login__field input, .os-signup__field input { width: 100%; padding: .65rem .9rem; background: var(--os-bg); border: 1px solid var(--os-border); border-radius: var(--os-radius); color: var(--os-text); }
.os-login__field input:focus, .os-signup__field input:focus { border-color: var(--os-accent); outline: none; }
.os-login__actions { display: flex; justify-content: space-between; align-items: center; font-size: .85rem; margin-bottom: 1.5rem; }
.os-login__submit, .os-signup__submit { width: 100%; margin-top: 1rem; }
.os-login__register, .os-signup__login { text-align: center; font-size: .85rem; color: var(--os-text-muted); margin-top: 1.5rem; }
.os-signup__agree { font-size: .8rem; color: var(--os-text-muted); margin-bottom: 1rem; }

/* — Legal — */
.os-legal { padding: 3rem 0; }
.os-legal__intro { max-width: 800px; margin-bottom: 2rem; color: var(--os-text-muted); font-size: .95rem; }
.os-legal__content { max-width: 800px; }
.os-legal__section { margin-bottom: 2.5rem; }
.os-legal__section h2 { font-size: 1.2rem; margin-bottom: .75rem; color: var(--os-accent); }
.os-legal__section p { margin-bottom: .75rem; font-size: .9rem; color: var(--os-text-muted); line-height: 1.8; }
.os-legal__section ul { padding-left: 1.5rem; margin-bottom: 1rem; }
.os-legal__section li { font-size: .9rem; color: var(--os-text-muted); margin-bottom: .4rem; }
.os-legal__footer { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--os-border); font-size: .85rem; color: var(--os-text-muted); }

/* — Responsive (补充页面) — */
@media (max-width: 900px) {
  .os-article__grid { grid-template-columns: 1fr; }
  .os-article__sidebar { position: static; }
  .os-related__grid { grid-template-columns: repeat(2, 1fr); }
  .os-article-nav__grid { grid-template-columns: 1fr; }
  .os-catlist__grid { grid-template-columns: 1fr; }
  .os-catlist__card { grid-template-columns: 160px 1fr; }
  .os-contact__grid { grid-template-columns: 1fr; }
  .os-app-hero__grid { grid-template-columns: 1fr; }
  .os-app-features__grid { grid-template-columns: repeat(2, 1fr); }
  .os-about-content__team-grid { grid-template-columns: repeat(2, 1fr); }
  .os-author__posts-grid { grid-template-columns: repeat(2, 1fr); }
  .os-about-content__stats { flex-wrap: wrap; }
}
@media (max-width: 600px) {
  .os-related__grid { grid-template-columns: 1fr; }
  .os-catlist__card { grid-template-columns: 1fr; }
  .os-app-features__grid { grid-template-columns: 1fr; }
  .os-about-content__team-grid { grid-template-columns: 1fr; }
  .os-author__profile { flex-direction: column; text-align: center; }
  .os-author__posts-grid { grid-template-columns: 1fr; }
  .os-app-hero__qr { flex-direction: column; align-items: center; }
}
/* — Changelog — */
.os-changelog { padding: 4rem 0; }
.os-changelog__sub { color: var(--os-text-muted); margin-bottom: 2.5rem; }
.os-changelog__year { margin-bottom: 3rem; }
.os-changelog__year-label { font-size: 1.3rem; color: var(--os-accent); margin-bottom: 1.5rem; padding-bottom: .5rem; border-bottom: 2px solid var(--os-accent); display: inline-block; }
.os-changelog__list { list-style: none; position: relative; padding-left: 2rem; }
.os-changelog__list::before { content: ''; position: absolute; left: 6px; top: 0; bottom: 0; width: 2px; background: var(--os-border); }
.os-changelog__item { position: relative; padding: 1rem 0 1.5rem 1.5rem; border-bottom: 1px solid var(--os-border); }
.os-changelog__item::before { content: ''; position: absolute; left: -2rem; top: 1.35rem; width: 12px; height: 12px; border-radius: 50%; background: var(--os-accent); border: 2px solid var(--os-bg); z-index: 1; }
.os-changelog__ver { display: inline-block; background: var(--os-accent); color: #000; font-size: .75rem; font-weight: 700; padding: .15rem .6rem; border-radius: 4px; margin-right: .75rem; }
.os-changelog__date { font-size: .8rem; color: var(--os-text-muted); }
.os-changelog__title { font-size: .95rem; margin-top: .5rem; }
.os-changelog__changes { padding-left: 1.2rem; margin-top: .5rem; }
.os-changelog__changes li { font-size: .85rem; color: var(--os-text-muted); margin-bottom: .3rem; }
/* — ICP 备案 — */
.footer-beian {
  margin-top: .75rem;
  font-size: .75rem;
  color: var(--os-text-muted);
  text-align: center;
}
.footer-beian a {
  color: var(--os-text-muted);
  text-decoration: none;
}
.footer-beian a:hover {
  color: var(--os-accent);
}
.footer-beian__sep {
  margin: 0 .5rem;
  opacity: .4;
}