/* ===========================================================
   宝山区教师荟 · 优质课程线上交流分享 2024 —— 站点样式
   视觉语言取自 101教育PPT（品牌橙 #F6821F）
   =========================================================== */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; padding: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Hiragino Sans GB", system-ui, sans-serif;
  background: #F4F5F7; color: #1D2129; font-size: 14px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
:root {
  --o: #F6821F; --o2: #FFA23A; --o-deep: #D9610B; --o-bg: #FFF6ED; --o-line: #FFDFC0;
  --ink: #1D2129; --ink2: #4E5969; --ink3: #86909C; --ink4: #A9AEB8;
  --line: #E5E6EB; --line2: #F2F3F5;
  --blue: #2B62D9; --green: #12A150; --red: #E34D4D;
  --r: 10px; --shadow: 0 1px 2px rgba(29,33,41,.04), 0 8px 24px rgba(29,33,41,.05);
  --maxw: 1220px;
}
a { color: inherit; }
.tnum { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
.mono { font-family: "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace; }

/* ---------------- 顶部导航 ---------------- */
.site-hd {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,.92); backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.hd-in {
  max-width: var(--maxw); margin: 0 auto; height: 62px;
  display: flex; align-items: center; gap: 8px; padding: 0 22px;
}
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; flex: 0 0 auto; white-space: nowrap; }
.mark {
  width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(140deg, #FFA238 0%, #F1680A 100%);
  box-shadow: 0 3px 10px rgba(241,104,10,.3);
  color: #fff; font-weight: 700; font-size: 14px; letter-spacing: -.6px;
}
.bt b { display: block; font-size: 15px; font-weight: 600; letter-spacing: .2px; line-height: 1.2; }
.bt i { display: block; font-style: normal; font-size: 11px; color: var(--ink3); letter-spacing: .5px; margin-top: 1px; }
.nav { display: flex; align-items: center; gap: 2px; margin-left: 24px; flex: 0 0 auto; }
.nav a {
  padding: 0 14px; height: 36px; line-height: 36px; border-radius: 7px;
  color: var(--ink2); text-decoration: none; font-size: 14px; white-space: nowrap;
  transition: background .16s, color .16s;
}
.nav a:hover { color: var(--o-deep); background: #FAFAFB; }
.nav a.on { color: var(--o-deep); background: var(--o-bg); font-weight: 600; }
.hd-r { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.hd-user { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--ink2); }
.hd-user .ava2 {
  width: 23px; height: 23px; border-radius: 50%; background: var(--o-bg); color: var(--o-deep);
  font-style: normal; font-size: 11px; font-weight: 600; display: grid; place-items: center;
}
.hd-out { font-size: 12.5px; color: var(--ink4); text-decoration: none; }
.hd-out:hover { color: var(--o-deep); }
.burger {
  display: none; margin-left: auto; width: 38px; height: 34px; border: 1px solid var(--line);
  border-radius: 8px; background: #fff; font-size: 16px; color: var(--ink2); cursor: pointer;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 38px; padding: 0 18px; border-radius: 8px; border: 1px solid var(--line);
  background: #fff; color: var(--ink2); font-size: 13.5px; font-family: inherit;
  cursor: pointer; text-decoration: none; white-space: nowrap; transition: .16s;
}
.btn:hover { border-color: #D4D7DD; color: var(--ink); }
.btn.sm { height: 32px; padding: 0 13px; font-size: 12.5px; border-radius: 7px; }
.btn.lg { height: 44px; padding: 0 24px; font-size: 14.5px; border-radius: 9px; }
.btn.primary {
  background: linear-gradient(135deg, #FF9C33, #F1680A); border-color: transparent; color: #fff;
  font-weight: 600; box-shadow: 0 3px 12px rgba(241,104,10,.26);
}
.btn.primary:hover { filter: brightness(1.05); color: #fff; }
.btn.ghost { background: rgba(255,255,255,.7); }
.btn.link { border: 0; background: none; color: var(--o-deep); padding: 0; height: auto; }
.btn.link:hover { text-decoration: underline; }

/* ---------------- 容器 ---------------- */
.shell { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
.sec { padding: 44px 0; }
.sec.tight { padding: 28px 0; }
.sec-hd { display: flex; align-items: flex-end; gap: 14px; margin-bottom: 20px; }
.sec-hd h2 { font-size: 21px; margin: 0; font-weight: 600; letter-spacing: .2px; }
.sec-hd p { margin: 0 0 3px; font-size: 13px; color: var(--ink3); }
.sec-hd .sp { flex: 1; }
.sec-hd .more { font-size: 13px; color: var(--o-deep); text-decoration: none; white-space: nowrap; }
.sec-hd .more:hover { text-decoration: underline; }

/* ---------------- 首页 Hero ---------------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 380px at 12% -12%, #FFF1DF 0%, rgba(255,241,223,0) 62%),
    radial-gradient(700px 300px at 88% 4%, #FFE9D2 0%, rgba(255,233,210,0) 60%),
    linear-gradient(180deg, #FFFDFA 0%, #F4F5F7 100%);
  border-bottom: 1px solid #EFEFF2;
}
.hero:after {
  content: ""; position: absolute; right: -120px; top: -120px; width: 460px; height: 460px;
  border-radius: 50%; border: 56px solid rgba(246,130,31,.055); pointer-events: none;
}
.hero-in {
  max-width: var(--maxw); margin: 0 auto; padding: 56px 22px 44px;
  display: grid; grid-template-columns: 1fr 396px; gap: 54px; align-items: center;
  position: relative; z-index: 2;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; height: 28px; padding: 0 13px;
  background: rgba(255,255,255,.9); border: 1px solid var(--o-line); border-radius: 20px;
  font-size: 12px; color: #A55E13; letter-spacing: .6px;
}
.eyebrow b { width: 6px; height: 6px; border-radius: 50%; background: var(--o); }
.hero h1 {
  font-size: 40px; line-height: 1.28; margin: 20px 0 0; font-weight: 700; letter-spacing: .5px;
}
.hero h1 em { font-style: normal; color: var(--o-deep); }
.hero .lead {
  margin: 16px 0 0; font-size: 15px; color: var(--ink2); line-height: 1.85; max-width: 560px;
}
.hero .acts { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.hero .mini { display: flex; gap: 26px; margin-top: 30px; flex-wrap: wrap; }
.hero .mini div { font-size: 12.5px; color: var(--ink3); }
.hero .mini b { display: block; font-size: 19px; color: var(--ink); font-weight: 600; letter-spacing: -.3px; }

/* Hero 右侧数据卡 */
.hero-card {
  background: #fff; border: 1px solid #EFE6DC; border-radius: 16px; padding: 20px 22px 18px;
  box-shadow: 0 10px 40px rgba(190,120,50,.12);
}
.hero-card .hd { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink3); }
.hero-card .hd b { color: var(--ink); font-weight: 600; font-size: 13px; margin-left: auto; }
.hero-card .big {
  display: flex; align-items: baseline; gap: 8px; margin: 12px 0 4px;
}
.hero-card .big strong {
  font-size: 46px; font-weight: 700; letter-spacing: -1.5px; line-height: 1;
  background: linear-gradient(135deg, #F1680A, #FF9C33); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-card .big span { font-size: 13px; color: var(--ink3); }
.hero-card .rows { margin-top: 14px; border-top: 1px dashed var(--line); padding-top: 12px; }
.hero-card .row { display: flex; align-items: center; justify-content: space-between; padding: 5px 0; font-size: 13px; color: var(--ink2); }
.hero-card .row b { font-weight: 600; color: var(--ink); }
.hero-card .row i { font-style: normal; color: var(--ink3); font-size: 12px; }
.hero-card .spark { margin-top: 8px; }

/* ---------------- 指标卡 ---------------- */
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.kpi {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 18px 20px 16px;
  position: relative; overflow: hidden;
}
.kpi:before {
  content: ""; position: absolute; left: 0; top: 16px; bottom: 16px; width: 3px; border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, #FFB067, #F1680A);
}
.kpi .k { font-size: 12.5px; color: var(--ink3); display: flex; align-items: center; gap: 6px; }
.kpi .v { font-size: 30px; font-weight: 600; letter-spacing: -.7px; margin-top: 4px; line-height: 1.15; }
.kpi .v small { font-size: 13px; font-weight: 400; color: var(--ink3); margin-left: 5px; letter-spacing: 0; }
.kpi .sub { font-size: 11.5px; color: var(--ink3); margin-top: 4px; }
.kpi .sub em { font-style: normal; color: var(--o-deep); }

/* ---------------- 卡片 ---------------- */
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--r); }
.card-hd {
  display: flex; align-items: center; gap: 10px; padding: 15px 20px; border-bottom: 1px solid var(--line);
}
.card-hd h3 { margin: 0; font-size: 14.5px; font-weight: 600; }
.card-hd .meta { font-size: 12px; color: var(--ink3); }
.card-hd .meta b { color: var(--o-deep); font-weight: 600; }
.card-hd .sp { flex: 1; }
.card-bd { padding: 16px 20px 18px; }
.card-bd.flush { padding: 0; }

/* ---------------- 表格 ---------------- */
.tb { width: 100%; border-collapse: collapse; }
.tb thead th {
  background: #FAFBFC; color: var(--ink3); font-weight: 500; font-size: 12.5px;
  padding: 11px 12px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap;
}
.tb thead th.c { text-align: center; }
.tb tbody td { padding: 12px; border-bottom: 1px solid var(--line2); font-size: 13.5px; vertical-align: middle; }
.tb tbody tr:last-child td { border-bottom: 0; }
.tb tbody tr:hover { background: #FFFBF6; }
.tb .tt { font-weight: 500; line-height: 1.45; }
.tb .tsub { font-size: 11.5px; color: var(--ink3); margin-top: 3px; }
.tb .c { text-align: center; }
.tag {
  display: inline-block; padding: 1px 8px; border-radius: 4px; font-size: 11.5px;
  background: #F2F3F5; color: var(--ink2); white-space: nowrap;
}
.tag.o { background: var(--o-bg); color: var(--o-deep); }
.tag.blue { background: #EDF2FE; color: var(--blue); }
.tag.green { background: #E9F8EF; color: var(--green); }
.num { font-size: 15px; font-weight: 600; }
.num.hot { color: var(--red); }
.copy {
  display: inline-flex; align-items: center; gap: 3px; font-size: 11px; color: var(--o-deep);
  border: 1px solid #FFD9B5; background: #FFF8F1; border-radius: 4px; padding: 1px 6px;
  cursor: pointer; margin-left: 6px; white-space: nowrap; font-family: inherit;
}
.copy:hover { background: #FFF1E2; }
.rowlink { color: var(--o-deep); text-decoration: none; font-size: 12.5px; margin-right: 12px; white-space: nowrap; }
.rowlink:hover { text-decoration: underline; }
.pager { display: flex; align-items: center; gap: 8px; padding: 14px 20px; color: var(--ink3); font-size: 12.5px; }
.pager .sp { flex: 1; }
.pg {
  min-width: 30px; height: 30px; padding: 0 8px; border: 1px solid var(--line); border-radius: 6px;
  background: #fff; display: inline-grid; place-items: center; font-size: 12.5px; color: var(--ink2);
  cursor: pointer; font-family: inherit;
}
.pg:hover { border-color: #D4D7DD; }
.pg.on { background: var(--o); border-color: var(--o); color: #fff; font-weight: 600; }
.pg:disabled { opacity: .45; cursor: default; }

/* ---------------- 筛选 ---------------- */
.filters {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  padding: 14px 18px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 16px;
}
.f { display: flex; align-items: center; gap: 8px; }
.f label { font-size: 13px; color: var(--ink2); white-space: nowrap; }
.ipt, .sel {
  height: 36px; border: 1px solid var(--line); border-radius: 7px; background: #fff;
  font-size: 13px; color: var(--ink); padding: 0 12px; font-family: inherit; outline: none;
}
.ipt:focus, .sel:focus { border-color: var(--o); box-shadow: 0 0 0 3px rgba(246,130,31,.1); }
.sel { cursor: pointer; appearance: none; padding-right: 30px;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6'><path d='M0 0l5 6 5-6' fill='%2386909C'/></svg>");
  background-repeat: no-repeat; background-position: right 11px center; }
.ipt.search { width: 230px; }

/* ---------------- 图表容器 ---------------- */
.chart { width: 100%; }
.chart svg { display: block; width: 100%; height: auto; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--ink3); }
.legend i { display: inline-block; width: 9px; height: 9px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }

.grid-2 { display: grid; grid-template-columns: 1.55fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

/* ---------------- 场次卡 ---------------- */
.scard {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden;
  display: flex; flex-direction: column; transition: .18s; text-decoration: none;
}
.scard:hover { border-color: #F3D3B4; box-shadow: 0 8px 26px rgba(200,120,40,.11); transform: translateY(-2px); }
.scard .thumb {
  height: 108px; position: relative; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #FFF4E6 0%, #FFE6CB 100%); color: #B4630F;
}
.scard .thumb .no { font-size: 30px; font-weight: 700; letter-spacing: -1px; opacity: .9; }
.scard .thumb .no small { font-size: 12px; font-weight: 400; opacity: .75; margin-left: 4px; letter-spacing: 0; }
.scard .thumb .badge {
  position: absolute; left: 12px; top: 12px; background: rgba(255,255,255,.88);
  color: #A55E13; font-size: 10.5px; padding: 2px 8px; border-radius: 4px;
}
.scard .thumb .wave { position: absolute; right: 0; bottom: 0; opacity: .5; }
.scard .thumb .play {
  position: absolute; right: 12px; bottom: 12px; width: 26px; height: 26px; border-radius: 50%;
  background: rgba(255, 255, 255, .86); color: #D9610B; font-size: 9px; padding-left: 2px;
  display: grid; place-items: center; box-shadow: 0 1px 6px rgba(180, 90, 10, .16);
}
.scard .bd { padding: 14px 16px 16px; flex: 1; display: flex; flex-direction: column; }
.scard .t2 { font-size: 14px; font-weight: 500; line-height: 1.5; height: 42px; overflow: hidden; }
.scard .m { margin-top: 10px; font-size: 12px; color: var(--ink3); display: flex; gap: 12px; flex-wrap: wrap; }
.scard .m b { color: var(--ink2); font-weight: 500; }
.scard .ft { margin-top: 12px; padding-top: 11px; border-top: 1px dashed var(--line); display: flex; align-items: center; font-size: 12px; color: var(--ink3); }
.scard .ft .go { margin-left: auto; color: var(--o-deep); }

/* ---------------- 步骤 / 说明 ---------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.step { background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 20px; position: relative; }
.step .n {
  width: 28px; height: 28px; border-radius: 8px; background: var(--o-bg); color: var(--o-deep);
  display: grid; place-items: center; font-weight: 700; font-size: 13px;
}
.step h4 { margin: 12px 0 6px; font-size: 14.5px; font-weight: 600; }
.step p { margin: 0; font-size: 12.5px; color: var(--ink2); line-height: 1.85; }
.step .eg {
  margin-top: 12px; font-size: 11.5px; color: var(--o-deep); background: #FFF9F3;
  border: 1px solid #FFE7D2; border-radius: 6px; padding: 7px 10px; word-break: break-all;
}

/* ---------------- 提示条 ---------------- */
.notice {
  display: flex; gap: 12px; align-items: flex-start; background: #FFF9F2; border: 1px solid #FFE3C6;
  border-radius: var(--r); padding: 14px 18px; font-size: 12.5px; color: #8A5A1E; line-height: 1.85;
}
.notice b { color: #A5450A; }
.note-line { font-size: 12px; color: var(--ink3); line-height: 1.95; margin-top: 14px; }
.note-line b { color: var(--ink2); }

/* ---------------- 页头（内页） ---------------- */
.page-hd { background: #fff; border-bottom: 1px solid var(--line); }
.page-hd .in { max-width: var(--maxw); margin: 0 auto; padding: 22px 22px 24px; }
.crumb { font-size: 12.5px; color: var(--ink3); margin-bottom: 12px; }
.crumb a { color: var(--ink3); text-decoration: none; }
.crumb a:hover { color: var(--o-deep); }
.crumb span { color: #C9CDD4; margin: 0 6px; }
.page-hd h1 { font-size: 24px; margin: 0; font-weight: 600; letter-spacing: .3px; }
.page-hd p { margin: 8px 0 0; font-size: 13px; color: var(--ink3); }
.page-hd .row { display: flex; align-items: flex-end; gap: 14px; }
.page-hd .row .sp { flex: 1; }

/* ---------------- 页脚 ---------------- */
.site-ft { background: #fff; border-top: 1px solid var(--line); margin-top: 20px; }
.ft-in {
  max-width: var(--maxw); margin: 0 auto; padding: 36px 22px 26px;
  display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 28px;
}
.ft-brand .brand { margin-bottom: 12px; }
.ft-brand p { margin: 0; font-size: 12px; color: var(--ink3); line-height: 1.95; max-width: 300px; }
.ft-col h5 { margin: 6px 0 12px; font-size: 12.5px; color: var(--ink); font-weight: 600; letter-spacing: .4px; }
.ft-col a { display: block; font-size: 12.5px; color: var(--ink3); text-decoration: none; padding: 4px 0; }
.ft-col a:hover { color: var(--o-deep); }
.ft-bar {
  border-top: 1px solid var(--line2); padding: 14px 22px; max-width: var(--maxw); margin: 0 auto;
  font-size: 11.5px; color: var(--ink4); display: flex; gap: 16px; flex-wrap: wrap;
}
.ft-bar .sp { flex: 1; }

/* ---------------- 单场详情 ---------------- */
.sess-bar { display: flex; gap: 20px; align-items: center; padding: 18px 20px; flex-wrap: wrap; }
.sess-bar .ico {
  width: 46px; height: 46px; border-radius: 11px; background: var(--o-bg); color: var(--o-deep);
  display: grid; place-items: center; font-size: 19px; flex: 0 0 46px;
}
.sess-bar .main { flex: 1; min-width: 220px; }
.sess-bar h2 { margin: 0 0 6px; font-size: 16px; font-weight: 600; line-height: 1.5; }
.sess-bar .kv { display: flex; gap: 18px; flex-wrap: wrap; font-size: 12.5px; color: var(--ink3); }
.sess-bar .kv b { color: var(--ink2); font-weight: 500; }
.sess-bar .url { font-size: 11.5px; color: var(--o-deep); background: #FFF8F1; border: 1px solid #FFE2C8; border-radius: 5px; padding: 4px 9px; display: inline-block; margin-top: 7px; }

.who { display: flex; align-items: center; gap: 9px; }
.ava {
  width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
  font-size: 11px; color: #fff; font-weight: 600; flex: 0 0 26px;
}
.durbar { height: 4px; background: #F2F3F5; border-radius: 2px; overflow: hidden; margin-top: 5px; width: 72px; }
.durbar i { display: block; height: 100%; background: linear-gradient(90deg, #FFB067, #F1680A); }

/* ---------------- 回放页 ---------------- */
.rp-wrap { display: grid; grid-template-columns: 1fr 330px; gap: 22px; align-items: start; }
.player {
  position: relative; width: 100%; aspect-ratio: 16/9; background: #0E1116; border-radius: 12px; overflow: hidden;
  box-shadow: 0 12px 34px rgba(16,22,32,.16);
}
.slide { position: absolute; inset: 0; background: #FFFDF9; display: flex; align-items: center; padding-left: 52px; gap: 18px; overflow: hidden; }
.slide .cover { flex: 1; min-width: 0; }
.cover .k { font-size: 32px; font-weight: 700; color: #2B3038; letter-spacing: 2px; margin-top: 18px; line-height: 1.25; }
.cover .k:after { content: ""; display: block; width: 44px; height: 4px; border-radius: 2px; background: linear-gradient(90deg, #FFA23A, #F1680A); margin-top: 13px; }
.cover .t { font-size: 16px; color: #5A616B; margin-top: 13px; letter-spacing: .4px; line-height: 1.6; }
.cover .u2 { font-size: 12.5px; color: #9099A3; margin-top: 12px; }
.cover .u2 i { font-style: normal; color: #D6D9DD; margin: 0 8px; }
.cover-art { flex: 0 0 32%; display: grid; place-items: center; }
.badge-tr {
  position: absolute; top: 13px; left: 13px; background: rgba(0,0,0,.5); color: #fff; font-size: 11px;
  padding: 4px 10px; border-radius: 5px; display: flex; align-items: center; gap: 6px;
}
.badge-tr i { width: 5px; height: 5px; border-radius: 50%; background: #FF5B5B; }
.play {
  position: absolute; inset: 0; display: grid; place-items: center; cursor: pointer;
  background: linear-gradient(180deg, rgba(0,0,0,0) 72%, rgba(0,0,0,.3) 100%);
}
.play .circ {
  width: 64px; height: 64px; border-radius: 50%; background: rgba(246,130,31,.95);
  display: grid; place-items: center; color: #fff; font-size: 23px; padding-left: 5px;
  box-shadow: 0 8px 24px rgba(0,0,0,.3); transition: .18s;
}
.play:hover .circ { transform: scale(1.06); }
.ctrl {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 10px 14px 12px; color: #fff; font-size: 11.5px;
  background: linear-gradient(180deg, rgba(0,0,0,0), rgba(0,0,0,.7));
}
.pbar { height: 3px; background: rgba(255,255,255,.26); border-radius: 2px; position: relative; margin-bottom: 9px; }
.pbar i { position: absolute; left: 0; top: 0; bottom: 0; width: 41%; background: linear-gradient(90deg, #FFB067, #F6821F); border-radius: 2px; }
.pbar u { position: absolute; left: 41%; top: -3px; width: 9px; height: 9px; border-radius: 50%; background: #fff; }
.ctrl .r { display: flex; align-items: center; gap: 14px; }
.ctrl .r .sp { flex: 1; }
.ctrl .r b { font-weight: 400; border: 1px solid rgba(255,255,255,.32); border-radius: 3px; padding: 1px 6px; font-size: 10.5px; }

.p-title h1 { font-size: 21px; margin: 18px 0 10px; font-weight: 600; letter-spacing: .2px; line-height: 1.5; }
.p-meta { display: flex; gap: 8px 18px; flex-wrap: wrap; font-size: 12.5px; color: var(--ink3); align-items: center; }
.p-meta b { color: var(--ink2); font-weight: 500; }
.urlbox {
  display: flex; align-items: center; gap: 10px; margin-top: 14px; padding: 10px 14px;
  background: #fff; border: 1px solid var(--line); border-radius: 8px;
}
.urlbox .lb { font-size: 11.5px; color: var(--ink3); flex: 0 0 auto; }
.urlbox .u { font-size: 12px; color: var(--o-deep); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.urlbox .sp { flex: 1; }

.rcard { background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 16px 18px; margin-bottom: 16px; }
.rcard h3 { margin: 0 0 12px; font-size: 13.5px; font-weight: 600; }
.rkv { display: flex; justify-content: space-between; gap: 12px; font-size: 12.5px; padding: 6px 0; color: var(--ink3); }
.rkv b { color: var(--ink); font-weight: 500; text-align: right; }
.teacher { display: flex; align-items: center; gap: 10px; padding-top: 11px; border-top: 1px dashed var(--line); margin-top: 9px; }
.teacher .ava { width: 34px; height: 34px; font-size: 13px; flex: 0 0 34px; }
.teacher .n { font-size: 13px; font-weight: 500; }
.teacher .o { font-size: 11.5px; color: var(--ink3); margin-top: 2px; }
.ch { display: flex; gap: 10px; font-size: 12.5px; padding: 7px 0; color: var(--ink2); border-bottom: 1px dashed #F2F3F5; line-height: 1.6; }
.ch:last-child { border-bottom: 0; }
.ch .tm { color: var(--o-deep); font-family: "SFMono-Regular", Consolas, monospace; font-size: 11.5px; flex: 0 0 42px; }
.ch.cur { color: var(--o-deep); font-weight: 600; }

/* ---------------- 通用工具 ---------------- */
.mt0 { margin-top: 0 } .mt8 { margin-top: 8px } .mt16 { margin-top: 16px } .mt24 { margin-top: 24px }
.mb0 { margin-bottom: 0 } .mb16 { margin-bottom: 16px }
.tc { text-align: center }
.muted { color: var(--ink3) } .small { font-size: 12px }
.hide { display: none !important }
.toast {
  position: fixed; left: 50%; bottom: 44px; transform: translate(-50%, 12px);
  background: rgba(29,33,41,.92); color: #fff; font-size: 13px; padding: 10px 20px; border-radius: 8px;
  opacity: 0; transition: .24s; pointer-events: none; z-index: 200; max-width: 82vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .hero-in { grid-template-columns: 1fr; gap: 32px; padding-top: 40px; }
  .hero-card { max-width: 440px; }
  .rp-wrap { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .kpis { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .ft-in { grid-template-columns: 1fr 1fr; }
  .nav { display: none; }
  .burger { display: block; }
  .hd-r .btn.ghost { display: none; }
  .site-hd.open .nav {
    display: flex; position: absolute; left: 0; right: 0; top: 62px; background: #fff;
    flex-direction: column; align-items: stretch; padding: 10px 16px 16px; gap: 2px;
    border-bottom: 1px solid var(--line); box-shadow: 0 12px 24px rgba(29,33,41,.08);
  }
  .site-hd.open .nav a { height: 44px; line-height: 44px; border-radius: 8px; }
}
@media (max-width: 640px) {
  body { font-size: 13.5px; }
  .hero h1 { font-size: 27px; }
  .hero .lead { font-size: 14px; }
  .hero-in { padding: 32px 18px 30px; }
  .hero-card .big strong { font-size: 38px; }
  .shell { padding: 0 16px; }
  .sec { padding: 30px 0; }
  .sec-hd { flex-wrap: wrap; }
  .sec-hd h2 { font-size: 18px; }
  .kpis { gap: 10px; }
  .kpi { padding: 14px 15px; }
  .kpi .v { font-size: 24px; }
  .grid-3 { grid-template-columns: 1fr; }
  .ft-in { grid-template-columns: 1fr; gap: 18px; padding: 26px 16px 18px; }
  .ft-bar { padding: 12px 16px; font-size: 11px; }
  .page-hd h1 { font-size: 19px; }
  .filters { padding: 12px; gap: 10px; }
  .ipt.search { width: 100%; }
  .tb thead th, .tb tbody td { padding: 9px 8px; font-size: 12.5px; }
  .card-hd { flex-wrap: wrap; row-gap: 4px; padding: 13px 15px; }
  .card-bd { padding: 12px 14px 14px; }
  .slide { padding-left: 22px; }
  .cover .k { font-size: 20px; margin-top: 10px; letter-spacing: 1px; }
  .cover .t { font-size: 12px; margin-top: 8px; }
  .cover .u2 { font-size: 10.5px; margin-top: 8px; }
  .cover .eyebrow { font-size: 10px; height: 22px; padding: 0 9px; }
  .cover-art { display: none; }
  .play .circ { width: 46px; height: 46px; font-size: 17px; }
  .p-title h1 { font-size: 17px; }
}