:root{
  --bg:#F5F3EE;
  --card:#FFFFFF;
  --ink:#171A18;
  --ink2:#66685F;
  --ink3:#8C8E84;
  --accent:#0C6B52;
  --accent-soft:#E7F1EC;
  --copper:#B4722A;
  --copper-soft:#F8EEE2;
  --green:#2F8358;
  --amber:#A9761C;
  --red:#B4463E;
  --line:rgba(23,26,24,.10);
  --line2:rgba(23,26,24,.18);
  --r:16px;
  --mono:'SF Mono','JetBrains Mono','Roboto Mono',ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--bg);color:var(--ink);
  font-family:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:15px;line-height:1.68;-webkit-font-smoothing:antialiased;
}
.disp{font-family:'Baloo 2','Noto Sans SC','PingFang SC',sans-serif;}
.wrap{max-width:1100px;margin:0 auto;padding:0 22px;}
a{color:inherit;text-decoration:none;}
button,input,select{font-family:inherit;}
img{max-width:100%;height:auto;}

/* ---------- header ---------- */
header{padding:18px 0 8px;}
.hrow{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;}
.brand{display:flex;align-items:center;gap:10px;}
.brand-mark{
  width:38px;height:38px;border-radius:11px;background:var(--accent);
  display:flex;align-items:center;justify-content:center;color:#fff;flex:0 0 auto;
  font-family:'Baloo 2',sans-serif;font-weight:800;font-size:15px;letter-spacing:.5px;
}
.brand-name{font-size:19px;font-weight:800;letter-spacing:.1px;line-height:1.2;}
.brand-sub{font-size:12px;color:var(--ink2);margin-top:-1px;}
.hnav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.hnav .link{font-size:14px;color:var(--ink2);padding:8px 11px;border-radius:10px;transition:background .15s,color .15s;}
.hnav .link:hover{background:rgba(23,26,24,.05);color:var(--ink);}
.langsw{display:flex;align-items:center;gap:2px;background:rgba(255,255,255,.75);border:1px solid var(--line);border-radius:999px;padding:3px;}
.lang-link{font-size:12.5px;font-weight:700;color:var(--ink2);padding:5px 9px;border-radius:999px;transition:background .15s,color .15s;white-space:nowrap;}
.lang-link:hover{background:rgba(23,26,24,.06);color:var(--ink);}
.lang-link.on{background:var(--ink);color:#fff;}
.btn{
  display:inline-flex;align-items:center;gap:7px;font-weight:700;font-size:14px;
  padding:9px 15px;border-radius:11px;border:1px solid transparent;cursor:pointer;
  transition:transform .12s,background .15s,box-shadow .15s;
}
.btn:active{transform:scale(.97);}
.btn-primary{background:var(--ink);color:#fff;}
.btn-primary:hover{background:#000;box-shadow:0 4px 14px rgba(23,26,24,.18);}
.btn-ghost{background:transparent;border-color:var(--line2);color:var(--ink);}
.btn-ghost:hover{background:rgba(23,26,24,.04);}

/* ---------- hero ---------- */
.hero{padding:34px 0 8px;}
.badge{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:600;color:var(--ink2);
  background:rgba(255,255,255,.8);border:1px solid var(--line);padding:6px 12px;border-radius:999px;margin-bottom:15px;
}
.badge .dot{width:8px;height:8px;border-radius:50%;background:var(--green);}
h1{font-size:36px;line-height:1.22;font-weight:900;letter-spacing:-.6px;margin-bottom:12px;max-width:24ch;}
h1 .accent{color:var(--accent);}
.lead{color:var(--ink2);font-size:15.5px;max-width:64ch;}
.lead b{color:var(--ink);font-weight:700;}
.herometa{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.chip{font-size:12px;font-weight:600;background:rgba(255,255,255,.75);border:1px solid var(--line);padding:4px 10px;border-radius:999px;color:var(--ink2);}
.chip b{color:var(--ink);font-weight:800;}

/* ---------- calculator ---------- */
.calc{
  margin-top:26px;background:var(--card);border:1px solid var(--line);border-radius:20px;
  box-shadow:0 1px 2px rgba(23,26,24,.03);overflow:hidden;
}
.calc-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  padding:16px 20px;border-bottom:1px solid var(--line);background:rgba(12,107,82,.03);
}
.calc-head .t{font-size:15px;font-weight:800;}
.calc-head .s{font-size:12.5px;color:var(--ink2);}
.calc-body{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:0;}
.calc-in{padding:20px;border-right:1px solid var(--line);}
.calc-out{padding:20px;background:rgba(23,26,24,.015);}

.field{margin-bottom:14px;}
.field label{display:block;font-size:12.5px;font-weight:700;color:var(--ink2);margin-bottom:5px;letter-spacing:.2px;}
.field .hint{font-size:11.5px;color:var(--ink3);margin-top:4px;line-height:1.5;}
.control{
  width:100%;appearance:none;background:#fff;border:1px solid var(--line2);border-radius:10px;
  padding:9px 11px;font-size:14px;color:var(--ink);outline:none;transition:border-color .15s,box-shadow .15s;
}
.control:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(12,107,82,.12);}
.control-num{font-family:var(--mono);font-weight:600;}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px;}

[type="range"]{
  -webkit-appearance:none;appearance:none;width:100%;height:4px;border-radius:999px;
  background:linear-gradient(90deg,var(--accent) var(--fill,50%),#DDDAD2 var(--fill,50%));
  outline:none;margin:9px 0 2px;
}
[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;width:17px;height:17px;border-radius:50%;background:#fff;
  border:2px solid var(--accent);box-shadow:0 1px 4px rgba(0,0,0,.15);cursor:pointer;
}
[type="range"]::-moz-range-thumb{
  width:15px;height:15px;border-radius:50%;background:#fff;border:2px solid var(--accent);cursor:pointer;
}
.slider-row{display:flex;align-items:center;justify-content:space-between;gap:10px;}
.slider-val{font-family:var(--mono);font-size:14px;font-weight:700;color:var(--accent);white-space:nowrap;}

.tabs{display:flex;gap:4px;background:rgba(23,26,24,.05);border-radius:10px;padding:3px;margin-bottom:14px;}
.tab{
  flex:1;text-align:center;font-size:12.5px;font-weight:700;padding:6px 8px;border-radius:8px;
  color:var(--ink2);cursor:pointer;border:none;background:transparent;transition:background .15s,color .15s;
}
.tab.on{background:#fff;color:var(--ink);box-shadow:0 1px 2px rgba(0,0,0,.06);}

/* result */
.verdict{
  display:flex;align-items:flex-start;gap:11px;padding:13px 14px;border-radius:13px;margin-bottom:16px;
  border:1px solid transparent;
}
.verdict .vdot{width:10px;height:10px;border-radius:50%;flex:0 0 auto;margin-top:5px;}
.verdict .vt{font-size:14.5px;font-weight:800;line-height:1.3;}
.verdict .vs{font-size:12.5px;color:var(--ink2);margin-top:3px;line-height:1.55;}
.v-ok{background:#E9F5EE;border-color:#BFE2CE;}
.v-ok .vdot{background:var(--green);}
.v-ok .vt{color:#1D6B45;}
.v-warn{background:#FBF2E2;border-color:#E9D3AC;}
.v-warn .vdot{background:var(--amber);}
.v-warn .vt{color:#8A5C12;}
.v-bad{background:#FBEBEA;border-color:#EFC9C5;}
.v-bad .vdot{background:var(--red);}
.v-bad .vt{color:#8F332C;}

.breakdown{margin-bottom:16px;}
.brow{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:7px 0;font-size:13px;border-bottom:1px dashed var(--line);}
.brow:last-child{border-bottom:none;padding-bottom:0;}
.brow .k{color:var(--ink2);}
.brow .v{font-family:var(--mono);font-weight:700;white-space:nowrap;}
.brow .v.hi{color:var(--accent);}
.brow.total{border-top:1px solid var(--line2);border-bottom:none;margin-top:6px;padding-top:10px;font-size:14px;}
.brow.total .k{font-weight:800;color:var(--ink);}
.brow.total .v{font-size:15px;}

.bar{height:9px;border-radius:999px;background:#E6E3DB;overflow:hidden;display:flex;margin:4px 0 6px;}
.bar .seg-w{background:var(--accent);}
.bar .seg-k{background:var(--copper);}
.bar .seg-o{background:#9A9C92;}
.barlegend{display:flex;flex-wrap:wrap;gap:10px;font-size:11.5px;color:var(--ink2);margin-bottom:14px;}
.barlegend span{display:inline-flex;align-items:center;gap:5px;}
.sw{width:9px;height:9px;border-radius:2px;display:inline-block;}

.quickstat{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
.qs{background:#fff;border:1px solid var(--line);border-radius:11px;padding:9px 11px;}
.qs .qk{font-size:11.5px;color:var(--ink2);font-weight:600;}
.qs .qv{font-family:var(--mono);font-size:15px;font-weight:800;margin-top:2px;}
.qs .qv small{font-size:11px;font-weight:600;color:var(--ink2);}

/* ---------- devices ---------- */
section{padding:34px 0 6px;}
.sec-title{font-size:25px;font-weight:800;letter-spacing:-.3px;}
.sec-sub{color:var(--ink2);font-size:14px;margin:6px 0 18px;max-width:70ch;}

.devlist{display:flex;flex-direction:column;gap:8px;}
.dev{
  display:grid;grid-template-columns:1.3fr .8fr 1fr auto;gap:12px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:13px;padding:13px 16px;
}
.dev .dn{font-size:14px;font-weight:800;}
.dev .dn small{display:block;font-size:11.5px;color:var(--ink2);font-weight:500;margin-top:1px;}
.dev .dv{font-size:12.5px;color:var(--ink2);font-family:var(--mono);}
.dev .dtag{font-size:11.5px;font-weight:800;padding:3px 9px;border-radius:999px;white-space:nowrap;justify-self:start;}
.dev .dtag.ok{background:var(--accent-soft);color:var(--accent);}
.dev .dtag.tight{background:var(--copper-soft);color:var(--copper);}
.dev .dtag.no{background:#F5E7E5;color:var(--red);}
.dev .dlink{font-size:12.5px;font-weight:700;color:var(--copper);white-space:nowrap;}
.dev .dlink:hover{text-decoration:underline;}

/* ---------- table ---------- */
.table-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;}
table{width:100%;border-collapse:collapse;min-width:720px;font-size:13.5px;}
th{
  background:rgba(23,26,24,.035);text-align:left;font-weight:700;padding:12px 15px;
  border-bottom:1px solid var(--line);white-space:nowrap;font-size:12.5px;color:var(--ink2);
}
td{padding:12px 15px;border-bottom:1px solid var(--line);vertical-align:middle;}
tr:last-child td{border-bottom:none;}
td.num{font-family:var(--mono);font-weight:700;}
.pill{display:inline-block;font-size:11.5px;font-weight:800;padding:2px 9px;border-radius:999px;white-space:nowrap;}
.pill.ok{background:var(--accent-soft);color:var(--accent);}
.pill.tight{background:var(--copper-soft);color:var(--copper);}
.pill.no{background:#F5E7E5;color:var(--red);}

/* ---------- prose ---------- */
.prose{max-width:74ch;}
.prose h2{font-size:23px;font-weight:800;letter-spacing:-.3px;margin:30px 0 10px;}
.prose h3{font-size:17.5px;font-weight:800;margin:22px 0 8px;}
.prose p{margin:0 0 14px;color:var(--ink);font-size:15px;}
.prose p.muted{color:var(--ink2);font-size:14px;}
.prose ul,.prose ol{margin:0 0 16px 20px;}
.prose li{margin-bottom:7px;font-size:14.5px;}
.prose a{color:var(--accent);font-weight:600;}
.prose a:hover{text-decoration:underline;}
.prose code{font-family:var(--mono);font-size:13px;background:rgba(23,26,24,.055);padding:2px 6px;border-radius:5px;}
.formula{
  background:var(--card);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:10px;padding:14px 16px;margin:16px 0;font-family:var(--mono);font-size:13px;line-height:1.85;
  overflow-x:auto;white-space:pre-wrap;word-break:break-word;
}
.callout{
  background:var(--copper-soft);border:1px solid #EBD6B8;border-radius:12px;padding:14px 16px;margin:18px 0;
}
.callout .ct{font-weight:800;font-size:14px;color:var(--copper);margin-bottom:4px;}
.callout p{margin:0;font-size:13.5px;color:#6B4A1C;}

/* ---------- faq ---------- */
.faq{display:flex;flex-direction:column;gap:9px;}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:13px;overflow:hidden;}
.faq-item summary{
  cursor:pointer;padding:14px 17px;font-weight:700;font-size:14.5px;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:12px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:20px;color:var(--ink2);font-weight:400;transition:transform .2s;font-family:'Baloo 2',sans-serif;}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-item .fa{padding:0 17px 14px;font-size:13.5px;color:var(--ink2);line-height:1.7;}

/* ---------- cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:13px;}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;
  transition:transform .15s,box-shadow .15s;
}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(23,26,24,.06);}
.card .ct{font-size:15px;font-weight:800;margin-bottom:5px;}
.card .cd{font-size:13px;color:var(--ink2);line-height:1.6;}
.card .cm{font-family:var(--mono);font-size:13px;font-weight:700;color:var(--accent);margin-top:10px;}

/* ---------- note ---------- */
.note{
  margin:26px 0 6px;background:var(--ink);color:#fff;border-radius:var(--r);
  padding:22px 24px;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;
}
.note .t{font-size:16px;font-weight:800;}
.note .s{font-size:13px;color:rgba(255,255,255,.72);margin-top:3px;max-width:56ch;}
.note .btn{background:#fff;color:var(--ink);}

.disclaimer{font-size:12px;color:var(--ink3);line-height:1.6;margin-top:20px;max-width:80ch;}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);margin-top:34px;padding:26px 0 22px;}
.frow{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:20px;margin-bottom:18px;}
footer h4{font-size:13.5px;font-weight:800;margin-bottom:8px;}
footer p{font-size:13px;color:var(--ink2);line-height:1.65;}
footer a{color:var(--accent);font-weight:600;}
footer a:hover{text-decoration:underline;}
.faff{font-size:12px;color:var(--ink3);border-top:1px solid var(--line);padding-top:15px;display:flex;flex-wrap:wrap;gap:6px 16px;}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .calc-body{grid-template-columns:1fr;}
  .calc-in{border-right:none;border-bottom:1px solid var(--line);}
  .dev{grid-template-columns:1fr auto;row-gap:8px;}
  .dev .dv,.dev .dtag{grid-column:1;}
  .dev .dlink{grid-column:2;grid-row:1 / span 2;align-self:center;}
}
@media (max-width:640px){
  .wrap{padding:0 16px;}
  h1{font-size:28px;}
  .hero{padding:26px 0 4px;}
  .sec-title{font-size:21px;}
  .quickstat{grid-template-columns:1fr;}
  .row2{grid-template-columns:1fr;}
  .note{padding:18px;}
  .hnav .link{display:none;}
}