:root {
  color-scheme: light;
  --navy: #11284e;
  --ink: #182943;
  --muted: #4a5d78;
  --blue: #214f99;
  --line: #dce5f0;
  --surface: #fff;
  --canvas: #f4f7fb;
  --radius: 14px;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; min-width: 300px; background: var(--canvas); color: var(--ink); font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif; line-height: 1.65; }
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 3px solid #407bd4; outline-offset: 3px; }
.shell { width: min(100% - 40px, 1080px); margin-inline: auto; }
.skip-link { position: fixed; z-index: 2; top: 8px; left: 8px; padding: 8px 12px; transform: translateY(-160%); background: var(--surface); }
.skip-link:focus { transform: translateY(0); }
.site-header { background: var(--surface); border-bottom: 1px solid var(--line); }
.header-inner, .footer-inner { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 750; letter-spacing: .05em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: white; background: var(--navy); border-radius: 9px; font-weight: 650; }
.header-link { color: var(--blue); font-size: .9rem; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.header-link span { margin-inline-start: 3px; }

.hero { position: relative; isolation: isolate; overflow: hidden; min-height: 242px; margin-top: 32px; padding: 34px clamp(22px, 6vw, 56px); border-radius: 20px; background: linear-gradient(110deg, #11284e 18%, #204978 100%); color: #fff; }
.hero-label { display: flex; align-items: center; gap: 10px; margin: 0 0 12px; color: #c9defc; font-size: .82rem; font-weight: 650; letter-spacing: .09em; }
.hero-label span { width: 17px; height: 2px; background: #90baf7; }
.hero h1 { margin: 0; font-size: clamp(2rem, 6vw, 3.35rem); line-height: 1.25; letter-spacing: -.03em; }
.hero-description { position: relative; max-width: 32ch; margin: 14px 0 0; color: #e0ecfd; font-size: clamp(.95rem, 2.8vw, 1.1rem); }
.hero-art { position: absolute; z-index: -1; top: 50%; right: 8%; transform: translateY(-50%) rotate(-12deg); width: min(27vw, 250px); height: 180px; opacity: .35; }
.hero-art i { position: absolute; inset: 20% 20%; border: 1px solid #9ac9ff; border-radius: 12px; background: #ffffff0c; }
.hero-art i:nth-child(1) { transform: translate(-24px, 24px); }
.hero-art i:nth-child(2) { transform: translate(-12px, 12px); }
.hero-art i:nth-child(3)::before, .hero-art i:nth-child(3)::after { content: ""; position: absolute; left: 17%; top: 31%; width: 58%; height: 1px; background: #b4d6ff; }
.hero-art i:nth-child(3)::after { top: 46%; width: 43%; }

.library { min-height: 420px; padding-block: 30px 50px; scroll-margin-top: 18px; }
.library-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 8px 18px; flex-wrap: wrap; margin-bottom: 12px; }
.library-heading h2, .category-heading h3 { margin: 0; line-height: 1.35; }
.catalog-status { margin: 0; color: var(--muted); font-size: .88rem; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.filters:empty { display: none; }
.filter { display: inline-flex; align-items: center; gap: 7px; min-height: 42px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); color: var(--ink); font: inherit; font-size: .88rem; cursor: pointer; }
.filter:hover { border-color: #9eb9e0; }
.filter[aria-pressed="true"] { border-color: var(--blue); background: var(--blue); color: white; }
.filter-count { color: var(--muted); font-size: .79rem; font-variant-numeric: tabular-nums; }
.filter[aria-pressed="true"] .filter-count { color: #e3efff; }
.results { display: grid; gap: 12px; }
.category { padding: clamp(14px, 3vw, 21px); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.category-heading { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.category-heading h3 { font-size: 1.12rem; }
.category-count { padding: 1px 8px; border-radius: 6px; background: var(--canvas); color: var(--muted); font-size: .78rem; }
.entry-list { display: grid; gap: 10px; list-style: none; padding: 0; margin: 12px 0 0; }
.entry { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 12px; min-height: 88px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; }
.file-mark { display: grid; place-items: center; align-self: center; width: 42px; height: 48px; border-radius: 7px; background: #edf3fc; color: var(--blue); font-size: .68rem; font-weight: 750; }
.entry-title { margin: 0; font-size: 1rem; font-weight: 750; overflow-wrap: anywhere; }
.entry-meta { margin: 2px 0 0; color: var(--muted); font-size: .82rem; }
.entry-actions { display: flex; gap: 7px; flex-wrap: wrap; }
.action { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 7px 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--blue); font-size: .85rem; font-weight: 650; text-decoration: none; white-space: nowrap; }
.action:hover { border-color: var(--blue); background: #f2f6fc; }
.action-primary { border-color: var(--blue); background: var(--blue); color: #fff; }
.action-primary:hover { background: #183d78; }
.empty { margin: 8px 0 0; color: var(--muted); font-size: .9rem; }
.site-footer { background: var(--surface); border-top: 1px solid var(--line); color: var(--muted); font-size: .84rem; }

@media (max-width: 610px) {
  .shell { width: calc(100% - 28px); }
  .hero { min-height: 185px; margin-top: 16px; }
  .hero-art { opacity: .2; right: 4%; }
  .entry { grid-template-columns: auto minmax(0, 1fr); }
  .entry-actions { grid-column: 2; }
}

@media (prefers-reduced-motion: no-preference) {
  .action, .filter { transition: background-color .15s ease, border-color .15s ease; }
}