:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --ink: #1d2433;
  --muted: #69738a;
  --line: #e5e9f2;
  --accent: #4f5bd5;
  --accent-soft: #eef0ff;
  --cn: #0f8a5f;
  --cn-soft: #e5f6ee;
  --intl: #8a5a0f;
  --intl-soft: #fbf1df;
  --shadow: 0 1px 2px rgba(20, 30, 60, .04), 0 6px 18px rgba(20, 30, 60, .06);
  --radius: 12px;
  --side: 232px;
  --top: 60px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151d;
    --panel: #1a1e29;
    --ink: #e6e9f2;
    --muted: #98a1b5;
    --line: #2a3040;
    --accent: #8d96ff;
    --accent-soft: #252a45;
    --cn: #5fd3a3;
    --cn-soft: #173229;
    --intl: #e7b866;
    --intl-soft: #3a2f1a;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--top) + 12px); }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }
.topbar { position: sticky; top: 0; z-index: 30; height: var(--top); display: flex; align-items: center; gap: 16px; padding: 0 20px; background: var(--panel); border-bottom: 1px solid var(--line); }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; width: calc(var(--side) - 20px); }
.logo-mark { background: var(--accent); color: #fff; font-weight: 700; padding: 4px 10px; border-radius: 8px; font-size: 14px; }
.logo-text { font-weight: 700; font-size: 17px; }
.top-search { flex: 1; max-width: 520px; }
.top-search input, .hero-search input { width: 100%; border: 1px solid var(--line); background: var(--bg); color: var(--ink); border-radius: 999px; padding: 9px 18px; font: inherit; outline: none; }
.top-search input:focus, .hero-search input:focus { border-color: var(--accent); }
.menu-btn { display: none; border: 0; background: none; color: var(--ink); font-size: 22px; cursor: pointer; padding: 4px; }
.shell { display: flex; }
.sidebar { position: sticky; top: var(--top); height: calc(100vh - var(--top)); width: var(--side); flex-shrink: 0; overflow-y: auto; padding: 16px 12px; background: var(--panel); border-right: 1px solid var(--line); }
.side-title { margin: 0 10px 8px; font-size: 12px; color: var(--muted); letter-spacing: .08em; }
.side-nav { list-style: none; margin: 0; padding: 0; }
.side-nav a { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; font-size: 14px; }
.side-nav a:hover { background: var(--accent-soft); color: var(--accent); }
.count { margin-left: auto; font-size: 12px; color: var(--muted); }
.ico { display: inline-block; width: 1.4em; text-align: center; margin-right: 4px; }
.side-nav .ico { margin-right: 0; }
.promo { margin: 18px 4px 8px; padding: 14px; border-radius: var(--radius); background: var(--accent-soft); }
.promo-title { margin: 0 0 6px; font-weight: 700; font-size: 14px; }
.promo-body { margin: 0 0 10px; font-size: 13px; color: var(--muted); }
.promo-link { font-size: 13px; font-weight: 600; color: var(--accent); }
.scrim { display: none; }
.rail { width: 272px; flex-shrink: 0; padding: 24px 20px 24px 0; }
.rail-card { position: sticky; top: calc(var(--top) + 24px); }
.rail-card, .rail-inline { padding: 22px 20px; border-radius: 16px; color: #fff; background: linear-gradient(150deg, #ff6a3d, #e8384f 55%, #b8236b); box-shadow: 0 10px 30px rgba(232, 56, 79, .28); }
.rail-eyebrow { display: inline-block; margin: 0 0 10px; padding: 2px 10px; border-radius: 999px; background: rgba(255, 255, 255, .22); font-size: 12px; font-weight: 600; }
.rail-title { margin: 0 0 12px; font-size: 20px; font-weight: 800; line-height: 1.35; }
.rail-points { margin: 0 0 18px; padding: 0; list-style: none; font-size: 14px; }
.rail-points li { padding: 4px 0 4px 22px; position: relative; }
.rail-points li::before { content: "✓"; position: absolute; left: 0; font-weight: 700; }
.rail-cta { display: block; text-align: center; padding: 11px 0; border-radius: 999px; background: #fff; color: #d6304a; font-weight: 700; }
.rail-cta:hover { opacity: .92; }
.rail-inline { display: none; margin-bottom: 18px; }
.main { flex: 1; min-width: 0; padding: 24px 28px 40px; max-width: 1280px; }
.hero { text-align: center; padding: 36px 16px 28px; margin-bottom: 8px; border-radius: 18px; background: linear-gradient(135deg, var(--accent-soft), var(--panel)); border: 1px solid var(--line); }
.hero h1 { margin: 0 0 8px; font-size: 32px; }
.hero p { margin: 0 auto 20px; color: var(--muted); max-width: 640px; }
.hero-search { display: flex; gap: 8px; max-width: 620px; margin: 0 auto 14px; }
.hero-search input { padding: 12px 20px; background: var(--panel); }
.hero-search button { white-space: nowrap; border: 0; border-radius: 999px; padding: 0 24px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.panel .chips { justify-content: flex-start; }
.chip { border: 1px solid var(--line); background: var(--panel); color: var(--ink); border-radius: 999px; padding: 4px 14px; font: inherit; font-size: 13px; cursor: pointer; }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.section { margin-top: 28px; }
.section-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.section-head h2 { margin: 0; font-size: 19px; }
.more { font-size: 13px; color: var(--muted); }
.more:hover { color: var(--accent); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.card { display: flex; gap: 12px; align-items: flex-start; padding: 14px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card-body { display: flex; flex-direction: column; min-width: 0; }
.card-name { display: flex; align-items: center; gap: 6px; font-weight: 650; }
.card-desc { font-size: 13px; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-top: 2px; }
.avatar { flex-shrink: 0; width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; font-weight: 700; font-size: 18px; color: hsl(var(--h) 60% 38%); background: hsl(var(--h) 75% 92%); }
@media (prefers-color-scheme: dark) { .avatar { color: hsl(var(--h) 75% 78%); background: hsl(var(--h) 30% 22%); } }
.avatar.lg { width: 72px; height: 72px; font-size: 32px; border-radius: 16px; }
.region { font-size: 11px; font-weight: 600; padding: 1px 6px; border-radius: 4px; }
.region.cn { color: var(--cn); background: var(--cn-soft); }
.region.intl { color: var(--intl); background: var(--intl-soft); }
.empty { text-align: center; color: var(--muted); padding: 30px 0; }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.crumbs a:hover { color: var(--accent); }
.sep { margin: 0 8px; }
.page-head { padding: 22px 24px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.page-head h1 { margin: 0 0 6px; font-size: 26px; }
.page-head p { margin: 0; color: var(--muted); }
.page-head a { color: var(--accent); }
.panel { margin-top: 18px; padding: 20px 24px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.panel h2 { margin: 0 0 10px; font-size: 18px; }
.panel p { margin: 0 0 8px; }
.muted { color: var(--muted); font-size: 14px; word-break: break-all; }
.muted a { color: var(--accent); }
.steps { margin: 0; padding-left: 20px; }
.steps li { margin: 4px 0; }
.tool-head { display: flex; gap: 18px; align-items: center; padding: 24px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; }
.tool-meta { flex: 1; min-width: 0; }
.tool-meta h1 { margin: 0; font-size: 28px; }
.tool-desc { margin: 4px 0 10px; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.tag { font-size: 12px; padding: 2px 8px; border-radius: 4px; background: var(--accent-soft); color: var(--accent); }
.visit { flex-shrink: 0; background: var(--accent); color: #fff; font-weight: 600; padding: 10px 22px; border-radius: 999px; }
.visit:hover { opacity: .9; }
.faq { border-top: 1px solid var(--line); padding: 10px 0; }
.faq:first-of-type { border-top: 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { margin: 8px 0 0; color: var(--muted); }
.footer { margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.footer p { margin: 4px 0; }
@media (max-width: 1199px) {
  .rail { display: none; }
  .rail-inline { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 18px; padding: 16px 20px; }
  .rail-inline .rail-eyebrow { margin: 0; }
  .rail-inline .rail-title { margin: 0; font-size: 17px; flex: 1; min-width: 200px; }
  .rail-inline .rail-points { display: none; }
  .rail-inline .rail-cta { padding: 8px 22px; }
}
@media (max-width: 900px) {
  .menu-btn { display: block; }
  .logo { width: auto; }
  .logo-text { display: none; }
  .sidebar { position: fixed; z-index: 40; top: var(--top); left: 0; transform: translateX(-100%); transition: transform .2s; }
  .sidebar.open { transform: none; }
  .scrim.open { display: block; position: fixed; inset: var(--top) 0 0 0; z-index: 35; background: rgba(0, 0, 0, .35); }
  .main { padding: 16px 16px 32px; }
  .hero h1 { font-size: 24px; }
  .tool-head { flex-wrap: wrap; }
  .visit { width: 100%; text-align: center; }
}