:root{
  --ink:#1c2433; --muted:#5b6474; --line:#e3e7ee;
  --bg:#f6f7f9; --card:#ffffff;
  --navy:#14315c; --navy2:#0e2342;
  --accent:#b7791f; --accent-bg:#fdf6e8;
  --green:#1e7e46; --green-bg:#e9f6ee;
  --blue:#1d5fd0; --blue-bg:#e9f0fd;
  --red:#c0392b; --red-bg:#fdecea;
  --radius:12px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.75;font-size:16px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}

/* header / nav */
.site-head{background:linear-gradient(135deg,var(--navy2),var(--navy));color:#fff}
.site-head .wrap{padding-top:26px;padding-bottom:0}
.brand{font-size:22px;font-weight:700;letter-spacing:.5px}
.brand small{display:block;font-size:12.5px;font-weight:400;color:#c9d4e8;margin-top:6px;letter-spacing:0}
nav.mainnav{margin-top:18px;display:flex;gap:2px;overflow-x:auto;scrollbar-width:thin}
nav.mainnav a{color:#dbe4f5;white-space:nowrap;padding:10px 13px;font-size:14.5px;border-radius:8px 8px 0 0;text-decoration:none}
nav.mainnav a:hover{background:rgba(255,255,255,.12);color:#fff}
nav.mainnav a.active{background:var(--bg);color:var(--navy);font-weight:700}
nav.mainnav a.calc-link{color:#ffd98a}
nav.mainnav a.calc-link.active{color:var(--navy)}
.menu-btn{display:none}

/* main */
main .wrap{padding-top:28px;padding-bottom:40px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin:0 0 20px;box-shadow:0 1px 2px rgba(20,49,92,.05)}
.card h2{margin:0 0 12px;font-size:20px;color:var(--navy);border-left:4px solid var(--accent);padding-left:10px}
.card h3{font-size:16.5px;color:var(--navy);margin:20px 0 8px}
.card h4{font-size:15.5px;margin:16px 0 6px}
p{margin:10px 0}
ul,ol{margin:8px 0;padding-left:24px}
li{margin:4px 0}
.hero{background:linear-gradient(135deg,#fff,#f2f6fd);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;margin-bottom:20px}
.hero h1{margin:0 0 8px;font-size:27px;color:var(--navy)}
.hero .sub{color:var(--muted);font-size:14.5px}
.hero .cta{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--navy);color:#fff;padding:10px 20px;border-radius:8px;font-size:15px;border:0;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--navy2);color:#fff;text-decoration:none}
.btn.gold{background:var(--accent)}
.btn.gold:hover{background:#9c671b}
.btn.ghost{background:#fff;color:var(--navy);border:1px solid var(--line)}
.btn.ghost:hover{background:#f0f3f8}
.btn.small{padding:6px 12px;font-size:13.5px}

/* tags */
.tag{display:inline-block;font-size:12px;padding:1px 8px;border-radius:20px;margin:0 4px 4px 0;border:1px solid}
.tag.zc{color:var(--green);border-color:#bfe3cc;background:var(--green-bg)}
.tag.hf{color:var(--blue);border-color:#bcd0f5;background:var(--blue-bg)}
.tag.rk{color:#7a5c00;border-color:#e8d48a;background:#fff8e1}
.tag.zz{color:#8a6d1a;border-color:#e3cf8e;background:var(--accent-bg)}
.tag.ls{color:#666;border-color:#d5d5d5;background:#f4f4f4}
.tag.ck{color:#a35400;border-color:#f0c896;background:#fff3e6}
.src{font-size:12.5px;color:var(--muted)}
.warn{background:var(--accent-bg);border:1px solid #ecd9a8;border-radius:8px;padding:12px 16px;margin:12px 0;font-size:14.5px}
.danger{background:var(--red-bg);border:1px solid #f3c1ba;border-radius:8px;padding:12px 16px;margin:12px 0;font-size:14.5px}
.ok{background:var(--green-bg);border:1px solid #bfe3cc;border-radius:8px;padding:12px 16px;margin:12px 0;font-size:14.5px}
.info{background:var(--blue-bg);border:1px solid #bcd0f5;border-radius:8px;padding:12px 16px;margin:12px 0;font-size:14.5px}

/* tables */
.table-scroll{overflow-x:auto;margin:12px 0;border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;font-size:14.5px;background:#fff;min-width:560px}
th,td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
th{background:#eef2f8;color:var(--navy);font-weight:600;white-space:nowrap}
tr:nth-child(even) td{background:#fafbfc}

/* timeline / steps */
.steps{list-style:none;padding:0;counter-reset:st}
.steps li{counter-increment:st;position:relative;padding:10px 0 10px 44px;border-bottom:1px dashed var(--line)}
.steps li:last-child{border-bottom:0}
.steps li::before{content:counter(st);position:absolute;left:0;top:10px;width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center}
.kv{display:grid;grid-template-columns:130px 1fr;gap:6px 12px;font-size:14.5px}
.kv dt{font-weight:600;color:var(--navy)}
.kv dd{margin:0}

/* calculator */
.calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:12px 0}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.field input,.field select{width:100%;padding:9px 10px;border:1px solid var(--line);border-radius:8px;font-size:15px;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus{outline:2px solid #9db9e8;border-color:var(--blue)}
.interval-row{display:grid;grid-template-columns:1fr 1fr auto;gap:8px;align-items:end;margin-bottom:8px}
.preset-bar{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.preset-bar button{background:#eef2f8;border:1px solid var(--line);border-radius:20px;padding:6px 14px;font-size:13.5px;cursor:pointer;color:var(--navy)}
.preset-bar button:hover{background:#dfe8f5}
.result-score{font-size:40px;font-weight:800;color:var(--navy);margin:6px 0}
.result-score small{font-size:15px;font-weight:400;color:var(--muted)}
.checkline{display:flex;gap:8px;align-items:flex-start;margin:8px 0;font-size:14.5px}
.checkline input{margin-top:5px}
.monthbar{display:flex;flex-wrap:wrap;gap:3px;margin:10px 0}
.monthbar span{font-size:11px;padding:2px 6px;border-radius:4px;background:#dfe8f5;color:var(--navy)}
.monthbar span.prop{background:#cfe3cf;color:#1e5c2e}
.monthbar span.gap{background:#f1f1f1;color:#999}

/* dp cards */
.dp{border-left:4px solid var(--navy)}
.dp h3{margin-top:0}
.dp .meta{font-size:13px;color:var(--muted)}

/* footer */
.site-foot{background:var(--navy2);color:#b9c6dd;margin-top:20px}
.site-foot .wrap{padding-top:26px;padding-bottom:26px;font-size:13.5px;line-height:1.8}
.site-foot a{color:#9fc0ee}
.site-foot .fine{color:#7e8ca6;font-size:12.5px}

/* toc */
.toc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;margin-bottom:20px;font-size:14.5px}
.toc b{color:var(--navy)}
.toc ul{margin:6px 0}

.backtop{position:fixed;right:18px;bottom:18px;background:var(--navy);color:#fff;border:0;border-radius:50%;width:44px;height:44px;font-size:18px;cursor:pointer;display:none;box-shadow:0 2px 8px rgba(0,0,0,.25)}

@media (max-width:720px){
  body{font-size:15px}
  .hero h1{font-size:22px}
  .card{padding:16px}
  .interval-row{grid-template-columns:1fr 1fr}
  .interval-row .rm{grid-column:1/-1}
  .kv{grid-template-columns:1fr}
  .kv dt{margin-top:8px}
}

@media print{
  .site-head nav,.backtop,.no-print,.hero .cta{display:none!important}
  body{background:#fff}
  .card{box-shadow:none;break-inside:avoid}
  .site-foot{background:#fff;color:#333;border-top:2px solid #333}
}