:root{
  --blue:#1e6fff;
  --blue-d:#0d55db;
  --blue-l:#e8f1ff;
  --ink:#0f1b2d;
  --ink2:#41536b;
  --ink3:#7b8ea8;
  --line:#e6eefa;
  --bg:#f5f8fd;
  --white:#fff;
  --gold:#f5a524;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans CN",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.75;font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}

/* ---------- nav ---------- */
.nav{background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.nav-in{max-width:1180px;margin:0 auto;padding:0 22px;height:62px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:17px;letter-spacing:.3px}
.brand .mark{
  width:34px;height:34px;border-radius:9px;background:var(--blue);color:#fff;
  display:grid;place-items:center;font-size:17px;font-weight:700;box-shadow:0 4px 12px rgba(30,111,255,.28)
}
.brand small{display:block;font-size:11px;font-weight:400;color:var(--ink3);letter-spacing:1.5px;line-height:1}
.nav-links{display:flex;gap:4px;margin-left:8px}
.nav-links a{padding:7px 14px;border-radius:8px;font-size:14.5px;color:var(--ink2);font-weight:500}
.nav-links a:hover{background:var(--blue-l);color:var(--blue)}
.nav-links a.on{background:var(--blue-l);color:var(--blue);font-weight:600}
.nav-right{margin-left:auto;font-size:13px;color:var(--ink3);display:flex;align-items:center;gap:8px}
.dot{width:6px;height:6px;border-radius:50%;background:#22c55e;display:inline-block}

/* ---------- hero ---------- */
.hero{background:var(--white);border-bottom:1px solid var(--line);padding:44px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.kicker{display:inline-flex;align-items:center;gap:7px;background:var(--blue-l);color:var(--blue);
  font-size:12.5px;font-weight:600;padding:5px 12px;border-radius:999px;margin-bottom:16px}
h1{font-size:38px;line-height:1.32;letter-spacing:-.5px;font-weight:800}
h1 em{font-style:normal;color:var(--blue)}
.hero p.sub{margin-top:14px;color:var(--ink2);font-size:15.5px;max-width:560px}
.stat-row{display:flex;gap:34px;margin-top:28px;flex-wrap:wrap}
.stat b{font-size:26px;font-weight:800;color:var(--blue);letter-spacing:-.5px}
.stat span{display:block;font-size:12.5px;color:var(--ink3);margin-top:2px}

.hot-card{background:var(--white);border:1px solid var(--line);border-radius:16px;padding:22px;
  box-shadow:0 10px 32px rgba(30,111,255,.10);position:relative}
.hot-card::before{content:"";position:absolute;left:0;top:20px;bottom:20px;width:4px;border-radius:4px;background:var(--blue)}
.hot-card .tag{font-size:12px;color:var(--blue);font-weight:700;letter-spacing:1px;padding-left:12px}
.hot-card h3{font-size:19px;line-height:1.5;margin:9px 0 10px;padding-left:12px;font-weight:700}
.hot-card .gist{font-size:13.5px;color:var(--ink2);padding-left:12px;min-height:44px}
.hot-card .foot{display:flex;align-items:center;gap:12px;padding-left:12px;margin-top:14px}

/* ---------- stars ---------- */
.stars{display:inline-flex;gap:2px;font-size:14px;letter-spacing:1px;color:#d7e2f2}
.stars i{font-style:normal}
.stars i.f{color:var(--blue)}
.stars.lg{font-size:17px}
.lvl{font-size:11.5px;font-weight:700;color:var(--blue);background:var(--blue-l);padding:2px 8px;border-radius:6px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:6px;background:var(--blue);color:#fff;border:none;
  padding:10px 20px;border-radius:9px;font-size:14px;font-weight:600;cursor:pointer;
  font-family:inherit;transition:.15s;box-shadow:0 4px 14px rgba(30,111,255,.24)}
.btn:hover{background:var(--blue-d);transform:translateY(-1px)}
.btn.ghost{background:var(--white);color:var(--blue);border:1px solid #cfe0ff;box-shadow:none}
.btn.ghost:hover{background:var(--blue-l);transform:none}
.btn.sm{padding:7px 14px;font-size:13px}

/* ---------- section ---------- */
.sec{padding:44px 0}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:22px;gap:16px;flex-wrap:wrap}
.sec-head h2{font-size:23px;font-weight:800;letter-spacing:-.3px;display:flex;align-items:center;gap:10px}
.sec-head h2::before{content:"";width:5px;height:22px;border-radius:3px;background:var(--blue)}
.sec-head .desc{font-size:13.5px;color:var(--ink3)}

/* ---------- cards ---------- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:20px;
  transition:.16s;display:flex;flex-direction:column;box-shadow:0 2px 8px rgba(30,111,255,.04)}
.card:hover{border-color:#bcd4ff;box-shadow:0 10px 26px rgba(30,111,255,.13);transform:translateY(-2px)}
.card .top{display:flex;align-items:center;gap:9px;margin-bottom:11px;flex-wrap:wrap}
.card h3{font-size:16.5px;line-height:1.55;font-weight:700;margin-bottom:8px}
.card .gist{font-size:13px;color:var(--ink2);flex:1}
.card .foot{display:flex;justify-content:space-between;align-items:center;margin-top:15px;
  padding-top:13px;border-top:1px solid #f1f5fd;font-size:12.5px;color:var(--ink3)}
.card .go{color:var(--blue);font-weight:600}

.chip{font-size:11.5px;padding:3px 9px;border-radius:6px;background:#f2f6fd;color:var(--ink2);font-weight:500;white-space:nowrap}
.chip.blue{background:var(--blue-l);color:var(--blue);font-weight:600}
.chip.ready{background:#e9fbf1;color:#0a9b57;font-weight:600}
.chip.draft{background:#fff6e8;color:#c47f10;font-weight:600}

/* ---------- topic grid ---------- */
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.topic{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:20px 20px 18px;
  display:block;transition:.16s;position:relative;overflow:hidden}
.topic:hover{border-color:#bcd4ff;transform:translateY(-2px);box-shadow:0 10px 26px rgba(30,111,255,.12)}
.topic .ico{font-size:24px;line-height:1}
.topic h4{font-size:16px;font-weight:700;margin:9px 0 5px;display:flex;align-items:center;gap:8px}
.topic .cnt{font-size:12px;color:var(--blue);font-weight:700;background:var(--blue-l);
  padding:1px 7px;border-radius:6px}
.topic p{font-size:12.5px;color:var(--ink3);line-height:1.6}

/* ---------- rating table ---------- */
.rate{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.rate-row{display:grid;grid-template-columns:120px 1fr;gap:16px;padding:14px 20px;border-bottom:1px solid #f1f5fd;align-items:center}
.rate-row:last-child{border-bottom:none}
.rate-row b{font-size:13.5px}

/* ---------- filter bar ---------- */
.filters{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:16px 18px;margin-bottom:20px}
.frow{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:7px 0}
.frow .lb{font-size:12.5px;color:var(--ink3);width:52px;flex-shrink:0;font-weight:600}
.pill{font-size:13px;padding:6px 13px;border-radius:8px;border:1px solid var(--line);
  background:var(--white);color:var(--ink2);cursor:pointer;font-family:inherit;transition:.13s}
.pill:hover{border-color:#bcd4ff;color:var(--blue)}
.pill.on{background:var(--blue);border-color:var(--blue);color:#fff;font-weight:600}
.search{flex:1;min-width:200px;border:1px solid var(--line);border-radius:9px;padding:9px 14px;
  font-size:14px;font-family:inherit;outline:none;transition:.15s}
.search:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(30,111,255,.10)}

/* ---------- list ---------- */
.list{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.row{display:flex;align-items:center;gap:16px;padding:15px 20px;border-bottom:1px solid #f3f7fd;transition:.12s}
.row:last-child{border-bottom:none}
.row:hover{background:#fafcff}
.row .idx{font-size:12.5px;color:var(--ink3);width:34px;flex-shrink:0;font-variant-numeric:tabular-nums}
.row .main{flex:1;min-width:0}
.row h4{font-size:15px;font-weight:600;margin-bottom:3px;line-height:1.5}
.row .gist{font-size:12.5px;color:var(--ink3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row .meta{display:flex;align-items:center;gap:10px;flex-shrink:0}

/* ---------- detail ---------- */
.dhead{background:var(--white);border-bottom:1px solid var(--line);padding:34px 0 30px}
.crumb{font-size:13px;color:var(--ink3);margin-bottom:14px}
.crumb a:hover{color:var(--blue)}
.dhead h1{font-size:31px;line-height:1.4;margin:12px 0 12px}
.dmeta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.dgist{font-size:15px;color:var(--ink2);max-width:820px;padding-left:14px;border-left:3px solid var(--blue)}
.dact{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}

.toc{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:14px 18px;
  display:flex;gap:6px;flex-wrap:wrap;margin:22px 0 0;position:sticky;top:62px;z-index:30}
.toc a{font-size:13px;color:var(--ink2);padding:5px 11px;border-radius:7px}
.toc a:hover{background:var(--blue-l);color:var(--blue)}

.block{background:var(--white);border:1px solid var(--line);border-radius:15px;padding:26px 28px;margin-bottom:18px}
.block > h2{font-size:19px;font-weight:800;margin-bottom:18px;display:flex;align-items:center;gap:10px}
.block > h2 .no{width:26px;height:26px;border-radius:8px;background:var(--blue);color:#fff;
  display:grid;place-items:center;font-size:13px;font-weight:700;flex-shrink:0}
.block > h2 .hint{margin-left:auto;font-size:12px;font-weight:400;color:var(--ink3)}
.txt{font-size:15px;color:#22334a;line-height:1.95;white-space:pre-wrap}
.txt em{font-style:normal;color:var(--blue);font-weight:600;background:linear-gradient(transparent 62%,#dbe9ff 62%)}

/* points */
.pt{display:flex;gap:14px;padding:15px 0;border-bottom:1px dashed #eaf1fb}
.pt:last-child{border-bottom:none;padding-bottom:0}
.pt .n{width:28px;height:28px;border-radius:9px;background:var(--blue-l);color:var(--blue);
  display:grid;place-items:center;font-weight:800;font-size:13px;flex-shrink:0;margin-top:2px}
.pt h4{font-size:15.5px;font-weight:700;margin-bottom:5px;color:var(--ink)}
.pt p{font-size:14px;color:var(--ink2);line-height:1.85}
.pt .key{color:var(--blue);font-weight:700}

/* quotes */
.q{background:#f7faff;border:1px solid #e9f1ff;border-radius:12px;padding:16px 18px 14px;position:relative;margin-bottom:12px}
.q:last-child{margin-bottom:0}
.q p{font-size:15px;color:#1b2c44;line-height:1.85;font-weight:500}
.q .from{font-size:12.5px;color:var(--ink3);margin-top:8px;text-align:right}
.q::before{content:"“";position:absolute;left:10px;top:2px;font-size:30px;color:#cfe0ff;font-family:Georgia,serif}

/* cases */
.cs{display:flex;gap:12px;padding:13px 0;border-bottom:1px solid #f3f7fd}
.cs:last-child{border-bottom:none}
.cs .nm{font-size:14px;font-weight:700;color:var(--blue);flex-shrink:0;width:150px}
.cs .bd{font-size:14px;color:var(--ink2);line-height:1.8}

/* framework table */
table.fw{width:100%;border-collapse:separate;border-spacing:0;font-size:14px}
table.fw th{background:var(--blue);color:#fff;font-weight:600;font-size:13.5px;padding:11px 14px;text-align:left}
table.fw th:first-child{border-radius:10px 0 0 0}
table.fw th:last-child{border-radius:0 10px 0 0}
table.fw td{padding:13px 14px;border-bottom:1px solid #eef4fd;vertical-align:top;color:var(--ink2);line-height:1.8}
table.fw tr:nth-child(even) td{background:#fafcff}
table.fw td.l1{font-weight:700;color:var(--blue);white-space:nowrap;width:88px}
table.fw td.l2{font-weight:600;color:var(--ink);width:210px}
table.fw tr:last-child td{border-bottom:none}

/* essay */
.essay{background:#fbfdff;border:1px solid #eaf2ff;border-radius:12px;padding:22px 24px;font-size:15px;
  line-height:2.05;color:#1e2f47;white-space:pre-wrap}

/* rewrite */
.rw{display:grid;grid-template-columns:1fr;gap:14px}
.rw .box{border-radius:12px;padding:17px 19px}
.rw .plain{background:#fff8f6;border:1px solid #ffe3da}
.rw .better{background:var(--blue-l);border:1px solid #cfe2ff}
.rw .lb{font-size:12px;font-weight:700;letter-spacing:.5px;margin-bottom:8px;display:flex;align-items:center;gap:6px}
.rw .plain .lb{color:#d4553a}
.rw .better .lb{color:var(--blue)}
.rw .box p{font-size:14.5px;line-height:1.95;color:#22334a}
.rw .why{background:#f7faff;border:1px dashed #cfe0ff;border-radius:10px;padding:13px 16px;font-size:13.5px;color:var(--ink2)}
.rw .why b{color:var(--blue)}

/* highlights */
.hl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.hl{background:#fafcff;border:1px solid #eaf2ff;border-left:3px solid var(--blue);border-radius:10px;padding:15px 17px}
.hl b{font-size:14px;display:block;margin-bottom:6px;color:var(--ink)}
.hl p{font-size:13.5px;color:var(--ink2);line-height:1.8}

.note{background:#fffbf0;border:1px solid #ffe9bf;border-radius:10px;padding:13px 16px;font-size:13.5px;color:#8a6216;margin-bottom:18px}

.rel{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.rel a{background:#fafcff;border:1px solid #eaf2ff;border-radius:10px;padding:13px 16px;font-size:14px;
  display:flex;justify-content:space-between;gap:10px;align-items:center}
.rel a:hover{border-color:#bcd4ff;background:var(--blue-l)}

.footer{border-top:1px solid var(--line);background:var(--white);padding:26px 0;margin-top:20px;
  font-size:12.5px;color:var(--ink3);text-align:center}

.empty{text-align:center;padding:60px 20px;color:var(--ink3);font-size:14px}

@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:26px}
  h1{font-size:28px}
  .grid3,.topic-grid{grid-template-columns:1fr 1fr}
  .hl-grid,.rel{grid-template-columns:1fr}
  .nav-links{display:none}
}
@media (max-width:640px){
  .grid3,.topic-grid{grid-template-columns:1fr}
  .dhead h1{font-size:23px}
  .block{padding:20px 18px}
  .cs{flex-direction:column;gap:3px}
  .cs .nm{width:auto}
  .row .meta .chip{display:none}
  .stat-row{gap:22px}
  table.fw{font-size:13px}
  table.fw td.l2{width:auto}
}

/* ---------- 收尾补充 ---------- */
.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.primary:hover{background:#1860e0;border-color:#1860e0;color:#fff}
.pill em{font-style:normal;font-size:11px;opacity:.55;margin-left:3px}
.pill.on em{opacity:.9}
.stars.lg{font-size:17px;letter-spacing:1.5px}
.toc a.on{background:#eef4ff;border-color:#cfe0ff;color:var(--blue)}
.dact{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.hl-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:820px){.hl-grid{grid-template-columns:1fr}.hero-grid{grid-template-columns:1fr}}