:root {
  --blue: #2563eb;
  --blue-50: #eff4ff;
  --accent: #f59e0b;
  --ink: #1a2233;
  --muted: #6b7280;
  --line: #e7e9ef;
  --bg: #f6f7f9;
  --card: #ffffff;
  --green: #059669;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 6px 18px rgba(16, 24, 40, .05);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.65; font-size: 14px;
}
a { color: inherit; text-decoration: none; }
.muted { color: var(--muted); font-size: 12px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 32px 20px; }
.sec-title { font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.sec-sub { font-size: 17px; font-weight: 700; margin: 30px 0 10px; }
.row-head { display: flex; justify-content: space-between; align-items: baseline; }
.more { color: var(--blue); font-size: 13px; }
.back { display: inline-block; color: var(--blue); margin-bottom: 14px; font-size: 13px; }

/* ---------- Nav ---------- */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.92); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { max-width: 1120px; margin: 0 auto; padding: 0 20px; height: 60px; display: flex; align-items: center; gap: 16px; }
.logo { font-size: 21px; font-weight: 800; letter-spacing: -.5px; }
.logo span { color: var(--blue); }
.menu { display: flex; gap: 2px; height: 100%; }
.menu-item { position: relative; height: 100%; display: flex; align-items: center; }
.menu-item > a { padding: 0 12px; height: 100%; display: flex; align-items: center; font-weight: 500; color: #374151; font-size: 14px; }
.menu-item:hover > a, .menu-item.active > a { color: var(--blue); }
.dropdown { position: absolute; top: 58px; left: 0; background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); padding: 6px; display: none; min-width: 150px; }
.menu-item:hover .dropdown { display: block; }
.dropdown a { display: block; padding: 9px 12px; border-radius: 8px; color: #374151; font-size: 13px; }
.dropdown a:hover { background: var(--blue-50); color: var(--blue); }
.nav-search { margin-left: auto; }
.nav-search input { width: 210px; padding: 9px 14px; border: 1px solid var(--line); border-radius: 999px; font-size: 13px; outline: none; background: #fff; }
.nav-search input:focus { border-color: var(--blue); }
.btn-upload { background: var(--accent); color: #fff; font-weight: 600; padding: 9px 16px; border-radius: 10px; font-size: 13px; }
.btn-upload:hover { opacity: .92; }

/* ---------- Hero ---------- */
.hero { background: linear-gradient(180deg, #eef3ff 0%, #f6f8fc 100%); border-bottom: 1px solid var(--line); }
.hero-inner { max-width: 880px; margin: 0 auto; padding: 58px 20px 50px; text-align: center; }
.hero h1 { font-size: 38px; font-weight: 800; line-height: 1.2; letter-spacing: -.5px; }
.hero p { margin: 14px auto 26px; color: #475569; font-size: 16px; max-width: 520px; }
.hero-search { display: flex; gap: 10px; max-width: 560px; margin: 0 auto; }
.hero-search input { flex: 1; padding: 13px 18px; border: 1px solid var(--line); border-radius: 999px; font-size: 15px; outline: none; background: #fff; }
.hero-search input:focus { border-color: var(--blue); }
.hero-search .btn-primary { white-space: nowrap; }
.hero-tags { margin-top: 16px; font-size: 13px; color: var(--muted); }
.hero-tags b { color: #374151; font-weight: 600; }
.hero-stats { display: flex; justify-content: center; gap: 44px; margin-top: 36px; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats b { font-size: 25px; font-weight: 800; color: var(--ink); }
.hero-stats span { font-size: 12px; color: var(--muted); }

/* ---------- Boards (首页入口) ---------- */
.board-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.board-card { background: var(--card); border: 1px solid var(--line); border-top: 3px solid var(--blue); border-radius: var(--radius); padding: 20px; position: relative; transition: .15s; box-shadow: var(--shadow); }
.board-card:hover { transform: translateY(-3px); }
.board-card h3 { font-size: 16px; margin-bottom: 6px; }
.board-card p { color: var(--muted); font-size: 13px; }
.board-card .arrow { position: absolute; right: 18px; bottom: 16px; color: var(--blue); font-size: 18px; }

/* ---------- 通用模型/数据集卡片 (HF 风) ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
.hcard { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; transition: .15s; box-shadow: var(--shadow); display: flex; flex-direction: column; }
a.hcard:hover { transform: translateY(-3px); border-color: var(--blue); }
.hcard-head { display: flex; align-items: center; gap: 10px; }
.avatar { width: 34px; height: 34px; border-radius: 9px; color: #fff; font-weight: 700; font-size: 15px; display: flex; align-items: center; justify-content: center; flex: none; }
.hcard-name { min-width: 0; flex: 1; }
.hcard-name b { font-size: 15px; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hcard-name span { font-size: 12px; color: var(--muted); }
.hcard-desc { color: #475569; font-size: 13px; margin: 10px 0; flex: 1; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; min-height: 38px; }
.hcard-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 12px; }
.tag { background: var(--blue-50); color: var(--blue); font-size: 11px; padding: 3px 9px; border-radius: 999px; }
.badge { background: #f1f5f9; color: #475569; font-size: 11px; padding: 3px 9px; border-radius: 999px; }
.badge.hot { background: #fef3c7; color: var(--accent); }
.hcard-foot { display: flex; align-items: center; gap: 14px; font-size: 12px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 11px; }
.hcard-foot .lic { margin-left: auto; color: #94a3b8; }
.hcard-foot .like { color: var(--accent); font-weight: 600; }

/* ---------- 列表页：侧栏 + 排序 ---------- */
.page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.sort { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #475569; }
.sort select { padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 13px; background: #fff; outline: none; }
.sort select:focus { border-color: var(--blue); }
.layout { display: grid; grid-template-columns: 220px 1fr; gap: 24px; margin-top: 18px; align-items: start; }
.sidebar { position: sticky; top: 76px; display: flex; flex-direction: column; gap: 20px; }
.facet-title { font-size: 13px; font-weight: 700; margin-bottom: 9px; color: #334155; }
.facet-items { display: flex; flex-wrap: wrap; gap: 6px; }
.fchip { border: 1px solid var(--line); background: #fff; color: #475569; font-size: 12px; padding: 5px 11px; border-radius: 999px; cursor: pointer; transition: .12s; }
.fchip:hover { border-color: var(--blue); color: var(--blue); }
.fchip.on { background: var(--blue); color: #fff; border-color: var(--blue); }

/* ---------- 教程卡片 (保留) ---------- */
.mcard, .dcard, .tcard { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; transition: .15s; box-shadow: var(--shadow); }
a.tcard:hover { transform: translateY(-3px); border-color: var(--blue); }
.tcard-top { display: flex; justify-content: space-between; margin-bottom: 8px; }
.tcard b { font-size: 15px; display: block; }
.tcard p { color: var(--muted); font-size: 13px; margin: 6px 0; }
.tcard .muted { color: var(--muted); }

/* ---------- Bar ---------- */
.bar { flex: 1; height: 7px; background: #eef2f7; border-radius: 999px; overflow: hidden; min-width: 60px; }
.bar span { display: block; height: 100%; background: var(--blue); border-radius: 999px; }

/* ---------- 列表（论坛/项目/招聘/活动/资讯） ---------- */
.post-list { display: flex; flex-direction: column; gap: 10px; margin-top: 16px; }
.post-row { display: flex; align-items: center; gap: 16px; padding: 16px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); transition: .15s; }
.post-row:hover { border-color: var(--blue); }
.post-tag { background: var(--blue-50); color: var(--blue); font-size: 12px; padding: 4px 10px; border-radius: 8px; white-space: nowrap; }
.post-body { flex: 1; }
.post-body b { font-size: 15px; }
.post-body p { color: var(--muted); font-size: 13px; margin-top: 2px; }

.thread-list, .job-list, .event-list, .proj-list { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }
.thread, .job, .event, .proj { display: flex; gap: 16px; padding: 18px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); transition: .15s; }
a.thread:hover, .proj:hover { border-color: var(--blue); }
.thread-main, .job-main, .proj-main { flex: 1; }
.thread-main b, .job-main b, .proj-main b { font-size: 15px; }
.thread-main p, .proj-main p { color: var(--muted); font-size: 13px; margin: 4px 0 8px; }
.thread-meta, .job-meta { text-align: right; display: flex; flex-direction: column; gap: 3px; white-space: nowrap; font-size: 12px; color: var(--muted); }
.job-salary { color: var(--green); font-weight: 700; font-size: 15px; }
.proj-stars { color: var(--accent); font-weight: 700; font-size: 14px; }

.event-date { text-align: center; min-width: 64px; background: var(--blue-50); color: var(--blue); border-radius: 10px; padding: 10px; }
.event-date b { display: block; font-size: 18px; }
.event-date span { font-size: 11px; }
.event-body b { font-size: 15px; }
.event-body p { color: #475569; font-size: 13px; margin: 4px 0 8px; }
.status { color: var(--green); font-size: 12px; margin-left: 8px; }

.nav-groups { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 18px; }
.nav-group { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.nav-group h3 { margin-bottom: 12px; font-size: 15px; }
.nav-link { display: flex; flex-direction: column; padding: 10px 0; border-top: 1px solid var(--line); }
.nav-link b { font-size: 14px; }
.nav-link:hover b { color: var(--blue); }

/* ---------- 详情页 ---------- */
.detail-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.detail-head h1 { font-size: 28px; }
.detail-cols { display: grid; grid-template-columns: 1fr 1.2fr; gap: 20px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.panel h3 { font-size: 16px; margin-bottom: 14px; }
.score-row { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; font-size: 13px; }
.score-row span { min-width: 90px; color: #475569; }
.score-row b { min-width: 28px; }
.kv { list-style: none; }
.kv li { display: flex; justify-content: space-between; padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
.kv li span { color: var(--muted); }
.detail-actions { display: flex; gap: 10px; margin-top: 18px; }
.detail-actions .btn { border: 1px solid var(--blue); color: var(--blue); padding: 10px 18px; border-radius: 10px; font-weight: 600; }
.detail-actions .btn-primary { background: var(--blue); color: #fff; }

.article { max-width: 720px; margin-top: 20px; }
.article .lead { font-size: 16px; color: #334155; margin-bottom: 14px; }
.article h3 { font-size: 17px; margin: 22px 0 8px; }
.article p { color: #475569; margin-bottom: 8px; }
.reply-box { margin-top: 24px; padding: 18px; background: var(--blue-50); border-radius: var(--radius); }

/* ---------- 榜单 ---------- */
.lb-tabs { display: flex; gap: 8px; margin: 18px 0; }
.lb-tab { border: 1px solid var(--line); background: #fff; padding: 9px 18px; border-radius: 10px; cursor: pointer; font-size: 14px; color: #475569; }
.lb-tab.active { background: var(--blue); color: #fff; border-color: var(--blue); }
.lb { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.lb th, .lb td { padding: 12px 14px; text-align: left; font-size: 13px; border-bottom: 1px solid var(--line); }
.lb th { background: #f8fafc; color: #475569; font-weight: 600; }
.lb tbody tr:hover { background: var(--blue-50); }
.lb a { color: var(--blue); font-weight: 600; }
.rank { font-weight: 800; color: var(--blue); width: 36px; }
.cell { display: flex; align-items: center; gap: 8px; }
.cell .bar { min-width: 70px; }
.cell b { min-width: 26px; }

/* ---------- 在线试用 ---------- */
.pg { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); margin-top: 16px; overflow: hidden; }
.pg-bar { display: flex; align-items: center; gap: 14px; padding: 14px 18px; border-bottom: 1px solid var(--line); background: #f8fafc; }
.pg-bar label { font-size: 13px; color: #475569; display: flex; align-items: center; gap: 8px; }
.pg-bar select { padding: 7px 10px; border-radius: 8px; border: 1px solid var(--line); font-size: 13px; }
.pg-chat { height: 380px; overflow-y: auto; padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 78%; padding: 12px 14px; border-radius: 12px; font-size: 14px; line-height: 1.5; }
.msg.bot { background: #f1f5f9; align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.user { background: var(--blue); color: #fff; align-self: flex-end; border-bottom-right-radius: 4px; }
.pg-input { display: flex; gap: 10px; padding: 14px 18px; border-top: 1px solid var(--line); }
.pg-input textarea { flex: 1; resize: none; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 14px; font-family: inherit; outline: none; }
.pg-input textarea:focus { border-color: var(--blue); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); background: #fff; margin-top: 40px; }
.footer-inner { max-width: 1120px; margin: 0 auto; padding: 26px 20px; display: flex; flex-direction: column; gap: 10px; align-items: center; text-align: center; }
.footer-links a { color: var(--blue); margin: 0 8px; font-size: 13px; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; flex-direction: row; flex-wrap: wrap; gap: 14px 24px; }
  .facet { flex: 1; min-width: 140px; }
}
@media (max-width: 860px) {
  .board-grid, .card-grid, .nav-groups { grid-template-columns: repeat(2, 1fr); }
  .detail-cols { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .nav-search { display: none; }
}
@media (max-width: 560px) {
  .board-grid, .card-grid, .nav-groups { grid-template-columns: 1fr; }
  .menu { display: none; }
}

/* ---------- 首页右侧热门榜 ---------- */
.home-2col { display: grid; grid-template-columns: 1fr 270px; gap: 24px; margin-top: 18px; align-items: start; }
.trend { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; position: sticky; top: 76px; }
.trend-title { font-weight: 700; font-size: 14px; margin-bottom: 12px; }
.trend-row { display: flex; align-items: center; gap: 10px; padding: 8px 6px; border-radius: 8px; }
.trend-row:hover { background: var(--blue-50); }
.trend-name { flex: 1; min-width: 0; }
.trend-name b { font-size: 13px; display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.trend-name span { font-size: 11px; color: var(--muted); }
.avatar.sm { width: 26px; height: 26px; border-radius: 7px; font-size: 12px; flex: none; }

/* ---------- 模型详情页 ---------- */
.md-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 10px; flex-wrap: wrap; }
.md-head h1 { font-size: 23px; font-weight: 800; }
.md-actions { display: flex; gap: 10px; }
.btn-ghost { border: 1px solid var(--line); background: #fff; padding: 9px 16px; border-radius: 10px; font-size: 13px; cursor: pointer; color: #374151; font-weight: 500; }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.md-meta { font-size: 13px; color: var(--muted); margin-bottom: 18px; }
.md-meta b { color: #374151; }
.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.tab { border: none; background: none; padding: 11px 16px; font-size: 14px; color: #475569; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tab.active { color: var(--blue); border-bottom-color: var(--blue); font-weight: 600; }
.md-body { display: grid; grid-template-columns: 210px 1fr; gap: 20px; align-items: start; }
.md-side { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; position: sticky; top: 76px; }
.side-title { font-size: 12px; font-weight: 700; color: #334155; margin: 4px 0 8px; text-transform: uppercase; letter-spacing: .03em; }
.side-link { color: var(--blue); font-size: 13px; }
.use-box { margin-bottom: 10px; }
.split { display: grid; grid-template-columns: 290px 1fr; gap: 20px; align-items: start; }
.split-l { position: sticky; top: 76px; }

/* ---------- 文件树 ---------- */
.filebox { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.frow { display: flex; justify-content: space-between; padding: 10px 14px; font-size: 13px; border-bottom: 1px solid var(--line); }
.frow:last-child { border-bottom: none; }
.frow.head { background: #f8fafc; color: #94a3b8; font-size: 11px; text-transform: uppercase; letter-spacing: .04em; }
.frow.total { font-weight: 600; color: #334155; }
.fname { color: #334155; } .fsize { color: var(--muted); }

/* ---------- 代码块 ---------- */
.codebox { border: 1px solid #1e293b; border-radius: 10px; overflow: hidden; margin: 10px 0; background: #0f172a; }
.code-head { display: flex; justify-content: space-between; align-items: center; padding: 6px 12px; background: #1e293b; color: #cbd5e1; font-size: 12px; }
.code-head .copy { background: #334155; color: #e2e8f0; border: none; padding: 4px 10px; border-radius: 6px; font-size: 12px; cursor: pointer; }
.code-head .copy:hover { background: var(--blue); }
.codebox pre { margin: 0; padding: 14px; overflow-x: auto; }
.codebox code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12.5px; color: #e2e8f0; line-height: 1.6; white-space: pre; }

/* ---------- README 排版 ---------- */
.readme h1 { font-size: 22px; margin-bottom: 8px; }
.readme h2 { font-size: 16px; margin: 18px 0 6px; font-weight: 700; }
.readme p { color: #475569; margin-bottom: 8px; }
.readme ul { margin: 8px 0 8px 20px; color: #475569; }
.readme li { margin: 3px 0; }

/* ---------- 响应式补 ---------- */
@media (max-width: 980px) {
  .home-2col { grid-template-columns: 1fr; }
  .trend { position: static; }
  .md-body { grid-template-columns: 1fr; }
  .md-side { position: static; }
  .split { grid-template-columns: 1fr; }
  .split-l { position: static; }
}