/* ============================================================
   顶级租售比 · 全站样式
   ============================================================ */
:root{
  --red:#C1121F;
  --red-dark:#8E0D17;
  --red-bright:#E23E4B;
  --red-soft:#FDEDEF;
  --red-line:#F6D2D6;

  --ink:#17161A;
  --ink2:#3D3B42;
  --muted:#7A7680;
  --faint:#A9A4AD;

  --line:#EDE8E6;
  --line2:#E3DDDA;

  --bg:#FBFAF9;
  --card:#FFFFFF;

  --ok:#0E9F6E;
  --warn:#D97706;

  --radius:16px;
  --shadow:0 1px 2px rgba(23,22,26,.05),0 12px 32px -20px rgba(23,22,26,.25);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.65;font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1340px;margin:0 auto;padding:0 36px}
.num{font-variant-numeric:tabular-nums}

/* ---------------- 顶栏 ---------------- */
.site-head{
  position:sticky;top:0;z-index:60;height:72px;background:rgba(255,255,255,.92);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.site-head .wrap{height:72px;display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand img{width:36px;height:36px;display:block}
.brand .name{font-size:17px;font-weight:900;letter-spacing:-.3px;color:var(--ink)}
.brand .name em{font-style:normal;color:var(--red)}

.nav{display:flex;align-items:center;gap:4px;margin-left:8px}
.nav a{
  padding:8px 14px;border-radius:9px;font-size:14.5px;font-weight:600;color:var(--ink2);
  white-space:nowrap;transition:.15s;
}
.nav a:hover{background:#F6F3F2;color:var(--ink)}
.nav a.on{color:var(--red);background:var(--red-soft)}

.head-cta{margin-left:auto;display:flex;align-items:center;gap:10px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:42px;padding:0 20px;border-radius:11px;border:1px solid var(--line2);
  background:#fff;color:var(--ink2);font-size:14px;font-weight:700;
  font-family:inherit;cursor:pointer;white-space:nowrap;transition:.15s;
}
.btn:hover{background:#F8F5F4;border-color:var(--line2)}
.btn.primary{background:linear-gradient(135deg,#D62430,#A50E1A);border:0;color:#fff;
  box-shadow:0 10px 24px -12px rgba(193,18,31,.9)}
.btn.primary:hover{filter:brightness(1.06)}
.btn.lg{height:50px;padding:0 28px;font-size:15.5px;border-radius:13px}
.btn.sm{height:36px;padding:0 14px;font-size:13px}

.burger{display:none;width:40px;height:40px;border:1px solid var(--line2);border-radius:10px;
  background:#fff;cursor:pointer;font-size:18px;color:var(--ink2)}

/* ---------------- 通用区块 ---------------- */
.section{padding:80px 0}
.section.tight{padding:54px 0}
.sec-head{display:flex;align-items:flex-end;gap:14px;margin-bottom:32px}
.sec-head h2{font-size:30px;font-weight:900;letter-spacing:-.8px}
.sec-head p{color:var(--muted);font-size:14px;margin-bottom:3px}
.sec-head .more{margin-left:auto;font-size:13.5px;font-weight:700;color:var(--red)}
.sec-head .more:hover{text-decoration:underline}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow)}

.tag{display:inline-block;padding:2px 9px;border-radius:99px;font-size:11.5px;font-weight:800;
  background:var(--red-soft);color:var(--red-dark)}
.tag.gray{background:#F3F1F0;color:var(--muted)}
.tag.ok{background:#E7F7F0;color:#0E7A55}

/* ---------------- 首页 Hero ---------------- */
.hero{
  position:relative;overflow:hidden;padding:92px 0 78px;
  background:
    radial-gradient(800px 380px at 12% -10%, rgba(193,18,31,.10), rgba(193,18,31,0) 62%),
    radial-gradient(700px 340px at 92% 0%, rgba(226,62,75,.10), rgba(226,62,75,0) 60%),
    #fff;
  border-bottom:1px solid var(--line);
}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:56px;align-items:center}
.hero .kicker{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:800;
  color:var(--red-dark);background:var(--red-soft);border:1px solid var(--red-line);
  padding:6px 13px;border-radius:99px}
.hero h1{font-size:60px;line-height:1.12;font-weight:900;letter-spacing:-1.8px;margin:20px 0 0}
.hero h1 em{font-style:normal;color:var(--red)}
.hero .lead{margin-top:20px;font-size:17.5px;color:var(--muted);max-width:520px}
.hero .cta{margin-top:30px;display:flex;gap:12px;flex-wrap:wrap}
.hero .meta{margin-top:16px;font-size:12.5px;color:var(--faint)}

/* 首页数据卡 */
.stat-board{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.stat-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px 26px;
  min-height:132px;display:flex;flex-direction:column;justify-content:center;box-shadow:var(--shadow)}
.stat-box .lbl{font-size:12.5px;color:var(--muted);font-weight:700}
.stat-box .val{font-size:34px;font-weight:900;letter-spacing:-1px;margin-top:4px;color:var(--red);
  font-variant-numeric:tabular-nums;line-height:1.1}
.stat-box .val small{font-size:14px;color:var(--muted);font-weight:700;letter-spacing:0}
.stat-box .sub{font-size:12px;color:var(--faint);margin-top:2px}

/* ---------------- 排行榜 ---------------- */
.rank-table{width:100%;border-collapse:collapse;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.rank-table th,.rank-table td{padding:16px 22px;text-align:left;border-bottom:1px solid #F4F0EE;font-size:15px}
.rank-table th{font-size:12.5px;font-weight:800;color:var(--muted);background:#FAF7F6;
  white-space:nowrap;letter-spacing:.02em}
.rank-table th.r,.rank-table td.r{text-align:right}
.rank-table tbody tr:hover{background:#FDFBFB}
.rank-table tbody tr:last-child td{border-bottom:0}
.rank-table .city{font-weight:800;font-size:15px}
.rank-table .city small{color:var(--faint);font-weight:600;font-size:12px;margin-left:6px}
.rank-no{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;
  border-radius:8px;background:#F3F1F0;color:var(--muted);font-weight:800;font-size:13px}
.rank-no.top1{background:#C1121F;color:#fff}
.rank-no.top2{background:#E0561F;color:#fff}
.rank-no.top3{background:#C98A1B;color:#fff}
.yield{font-weight:900;color:var(--red);font-variant-numeric:tabular-nums;font-size:15.5px}

.sortbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:18px}
.sortbar a{padding:7px 14px;border-radius:9px;border:1px solid var(--line2);background:#fff;
  font-size:13.5px;font-weight:700;color:var(--ink2)}
.sortbar a.on{background:var(--red);border-color:var(--red);color:#fff}
.sortbar .method-btn{margin-left:auto;padding:9px 17px;border-radius:10px;
  border:1px solid var(--red-line);background:var(--red-soft);color:var(--red-dark);
  font-size:13.5px;font-weight:800}
.sortbar .method-btn:hover{background:#FBE7E9}

.pct{font-weight:900;font-variant-numeric:tabular-nums;font-size:15px;color:var(--ink)}
.pct.good{color:#0E7A55}
.pct.neg{color:#B42318}

.method-note{display:flex;align-items:center;gap:24px;margin-top:22px;padding:18px 24px}
.method-note b{font-size:14px}
.method-note p{color:var(--muted);font-size:13px;line-height:1.85;margin-top:5px;max-width:940px}
.method-note .btn{margin-left:auto;flex:none}

/* ---------------- 计算方法页 ---------------- */
.method-hero{background:#fff;border-bottom:1px solid var(--line)}
.method-hero .back{font-size:13px;font-weight:700;color:var(--muted)}
.method-hero .back:hover{color:var(--red)}
.method-hero h1{font-size:40px;font-weight:900;letter-spacing:-1.4px;margin:12px 0 14px}
.method-hero .lead{max-width:880px;color:var(--ink2);font-size:16.5px;line-height:1.9}
.method-hero .lead b{color:var(--red-dark)}

.m-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:start}
.m-grid.three{grid-template-columns:repeat(3,1fr)}
.m-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 32px;box-shadow:var(--shadow)}
.m-card.small{padding:24px 26px}
.m-card.dark{background:linear-gradient(160deg,#1C1A1F,#2A262C);border:0;color:#fff}
.m-card.dark .m-sub,.m-card.dark .m-list li{color:#C9C4CC}
.m-tag{display:inline-block;font-size:11.5px;font-weight:800;letter-spacing:.08em;
  color:var(--red);background:var(--red-soft);border-radius:99px;padding:3px 11px}
.m-card.dark .m-tag{background:rgba(255,255,255,.12);color:#FFC9CE}
.m-card h2{font-size:24px;font-weight:900;letter-spacing:-.6px;margin:12px 0 6px}
.m-card h3{font-size:17px;font-weight:900;margin-bottom:10px}
.m-sub{color:var(--muted);font-size:14px;margin-bottom:20px}

.formula{background:#FAF7F6;border:1px solid var(--line);border-radius:11px;
  padding:12px 15px;font-size:13.5px;font-weight:600;line-height:1.7;margin-bottom:9px;
  font-variant-numeric:tabular-nums}
.m-card.dark .formula{background:rgba(255,255,255,.07);border-color:rgba(255,255,255,.14);color:#F2EEF0}
.formula.key{background:var(--red-soft);border-color:var(--red-line);color:var(--red-dark);font-weight:800}
.m-card.dark .formula.key{background:rgba(226,62,75,.22);border-color:rgba(226,62,75,.45);color:#FFDDE0}

.m-list{margin:18px 0 0;padding-left:18px;color:var(--ink2);font-size:13.5px;line-height:1.95}
.m-list li{margin-bottom:3px}

.m-h2{font-size:27px;font-weight:900;letter-spacing:-.7px;margin:56px 0 8px}
.m-note{color:var(--muted);font-size:14px;line-height:1.9;margin-bottom:18px}
.m-note a{color:var(--red);font-weight:700;text-decoration:underline}

.assume-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden}
.assume-table th,.assume-table td{padding:13px 22px;text-align:left;border-bottom:1px solid #F4F0EE;font-size:14px}
.assume-table th{font-size:12.5px;font-weight:800;color:var(--muted);background:#FAF7F6;white-space:nowrap}
.assume-table td.r,.assume-table th.r{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.assume-table tbody tr:last-child td{border-bottom:0}
.assume-table td:last-child{color:var(--muted);font-size:13.5px}

.calc-table{width:100%;border-collapse:collapse;font-size:14px}
.calc-table td{padding:9px 0;border-bottom:1px solid #F6F2F1;color:var(--ink2)}
.calc-table td.r{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.calc-table tr.minus td{color:var(--muted)}
.calc-table tr.sum td{font-weight:800;color:var(--ink);border-top:1px solid var(--line2)}
.calc-table tr.result td{font-weight:900;font-size:15px;border-bottom:0;padding-top:14px}
.calc-table tr.result td.r{font-size:20px;letter-spacing:-.4px}

.warn{margin-top:16px;background:#FFF6F1;border:1px solid #F6D2C6;color:#8A3B1B;
  border-radius:11px;padding:12px 15px;font-size:13.5px;line-height:1.8}
.ok-note{margin-top:16px;background:#EAF8F2;border:1px solid #C7EBDB;color:#0B6B4C;
  border-radius:11px;padding:12px 15px;font-size:13.5px;line-height:1.8}

.m-cta{display:flex;align-items:center;gap:26px;margin-top:52px;padding:26px 32px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.m-cta b{font-size:16px;display:block}
.m-cta span{color:var(--muted);font-size:13.5px}
.m-cta .btn{margin-left:auto;flex:none}

/* ---------------- 计算器 ---------------- */
.calc-grid{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:28px;align-items:start}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--ink2);margin-bottom:6px}
.field label em{font-style:normal;color:var(--faint);font-weight:500;font-size:12px;margin-left:4px}
.field input,.field select,.field textarea{
  width:100%;border:1px solid var(--line2);border-radius:11px;padding:11px 13px;
  font-family:inherit;font-size:15px;color:var(--ink);background:#fff;transition:.15s
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:0;border-color:var(--red);box-shadow:0 0 0 3.5px rgba(193,18,31,.10)
}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}

.result-hero{background:linear-gradient(135deg,#C1121F,#8E0D17);color:#fff;border-radius:16px;
  padding:26px 28px;box-shadow:0 20px 40px -24px rgba(193,18,31,.9)}
.result-hero .lbl{font-size:13px;opacity:.82;font-weight:700}
.result-hero .big{font-size:48px;font-weight:900;letter-spacing:-2px;line-height:1.05;margin-top:4px;
  font-variant-numeric:tabular-nums}
.result-hero .big small{font-size:18px;font-weight:800;letter-spacing:0;opacity:.9}
.result-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.result-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.result-item .k{font-size:12.5px;color:var(--muted);font-weight:700}
.result-item .v{font-size:22px;font-weight:900;margin-top:2px;font-variant-numeric:tabular-nums}
.verdict{margin-top:16px;padding:12px 16px;border-radius:12px;font-size:13.5px;font-weight:600;
  background:#F8F5F4;color:var(--ink2)}
.verdict.good{background:#E7F7F0;color:#0B6B4B}
.verdict.bad{background:#FEF2F2;color:#B42318}

/* ---------------- 文章/案例 ---------------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.case-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  box-shadow:var(--shadow);transition:.18s;display:flex;flex-direction:column}
.case-card:hover{transform:translateY(-3px);box-shadow:0 24px 44px -30px rgba(23,22,26,.45)}
.case-card .thumb{height:132px;background:linear-gradient(135deg,#FBE9EB,#F7DADD);
  display:flex;align-items:center;justify-content:center;font-size:34px;font-weight:900;color:var(--red);
  font-variant-numeric:tabular-nums}
.case-card .body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.case-card h3{font-size:16px;font-weight:800;line-height:1.4;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.case-card .meta{font-size:12.5px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap}
.case-card .foot{margin-top:auto;padding-top:12px;display:flex;align-items:center;gap:8px;
  font-size:12.5px;color:var(--faint)}

.doc h2{font-size:24px;font-weight:900;letter-spacing:-.5px;margin:40px 0 14px}
.doc h3{font-size:18px;font-weight:800;margin:26px 0 10px}
.doc p{margin:12px 0;color:var(--ink2);line-height:1.85}
.doc ul,.doc ol{margin:12px 0 12px 22px;color:var(--ink2);line-height:1.9}
.doc li{margin:6px 0}
.doc blockquote{margin:18px 0;padding:14px 18px;border-left:3px solid var(--red);
  background:var(--red-soft);border-radius:0 10px 10px 0;color:var(--ink2);font-weight:600}
.doc .callout{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:18px 0}

/* ---------------- 表单 ---------------- */
.form-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;
  box-shadow:var(--shadow)}
.msg{padding:11px 15px;border-radius:11px;font-size:13.5px;font-weight:600;margin-bottom:16px}
.msg.err{background:#FEF2F2;border:1px solid #FECACA;color:#B42318}
.msg.ok{background:#E7F7F0;border:1px solid #A7F3D0;color:#047857}

/* ---------------- 页脚 ---------------- */
.site-foot{background:#161418;color:#C9C4C8;padding:52px 0 30px;margin-top:20px}
.site-foot .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.site-foot h4{font-size:13px;font-weight:800;color:#fff;margin-bottom:12px;letter-spacing:.04em}
.site-foot a{display:block;font-size:13.5px;color:#A9A4AD;margin:7px 0}
.site-foot a:hover{color:#fff}
.site-foot .brand-f{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.site-foot .brand-f img{width:32px;height:32px}
.site-foot .brand-f b{color:#fff;font-size:16px;font-weight:900}
.site-foot .desc{font-size:13px;color:#8A858E;line-height:1.8;max-width:300px}
.site-foot .bottom{margin-top:36px;padding-top:20px;border-top:1px solid #262329;
  display:flex;gap:14px;flex-wrap:wrap;font-size:12.5px;color:#7C777F}
.site-foot .bottom .sp{flex:1}

/* ---------------- 响应式 ---------------- */
@media (max-width:1000px){
  .hero .wrap{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:40px;letter-spacing:-1.2px}
  .grid-3{grid-template-columns:1fr 1fr}
  .calc-grid{grid-template-columns:1fr}
  .m-grid{grid-template-columns:1fr}
  .m-grid.three{grid-template-columns:1fr}
  .m-card{padding:24px}
  .method-hero h1{font-size:32px}
  .site-foot .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .wrap{padding:0 16px}
  .nav{display:none}
  .nav.open{display:flex;position:absolute;top:72px;left:0;right:0;background:#fff;
    flex-direction:column;align-items:stretch;padding:10px 16px 16px;gap:2px;
    border-bottom:1px solid var(--line);box-shadow:0 20px 30px -20px rgba(0,0,0,.25)}
  .nav.open a{padding:13px 12px;border-radius:10px}
  .burger{display:block}
  .head-cta .btn:not(.primary){display:none}
  .hero{padding:44px 0 40px}
  .hero h1{font-size:31px;letter-spacing:-.8px}
  .hero .lead{font-size:15px}
  .section{padding:44px 0}
  .sec-head h2{font-size:21px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .rank-table th,.rank-table td{padding:11px 8px;font-size:13px}
  .rank-table .hide-sm{display:none}
  .rank-table .city small{display:none}
  .rank-table .yield{font-size:14.5px}
  .sec-head{flex-direction:column;align-items:flex-start;gap:4px;margin-bottom:18px}
  .sec-head .more{margin-left:0}
  .result-hero .big{font-size:38px}
  .result-list{grid-template-columns:1fr 1fr}
  .site-foot .cols{grid-template-columns:1fr 1fr;gap:24px}
  .site-foot .bottom .sp{flex-basis:100%}

  /* 排行榜筛选条：方法按钮独占一行、靠右 */
  .sortbar .method-btn{margin-left:auto}
  .method-note{flex-direction:column;align-items:flex-start;gap:14px;padding:18px}
  .method-note .btn{margin-left:0;width:100%}
  .m-h2{font-size:21px;margin-top:38px}
  .m-cta{flex-direction:column;align-items:stretch;gap:14px;padding:22px}
  .m-cta .btn{margin-left:0;width:100%}
  .assume-table th,.assume-table td{padding:11px 12px;font-size:13px}
  .assume-table td:last-child{display:none}
  .assume-table th:last-child{display:none}
  .calc-table{font-size:13px}
  .calc-table tr.result td.r{font-size:17px}
}