:root{
  --ink:#0e1c2b; --ink-2:#22384f; --muted:#5c7186;
  --blue:#0b6fb8; --blue-d:#0a4e85; --cyan:#00b3c8; --cyan-l:#e6f8fa;
  --bg:#f5f8fb; --card:#ffffff; --line:#dce7f1; --line-2:#eef4f9;
  --ok:#0f9d58; --warn:#e8a33d; --risk:#d9534f;
  --radius:14px; --shadow:0 1px 2px rgba(14,28,43,.04),0 8px 24px rgba(14,28,43,.06);
  --shadow-lg:0 24px 60px rgba(11,111,184,.14);
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Segoe UI",system-ui,sans-serif;
  color:var(--ink); background:var(--bg); line-height:1.75; font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none;}
a:hover{color:var(--cyan);}
img{max-width:100%;display:block;}
code,kbd,pre{font-family:"JetBrains Mono",Consolas,"Courier New",monospace;}

/* ---------- Layout ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.narrow{max-width:900px;}
section{padding:64px 0;}
section.tight{padding:40px 0;}

/* ---------- Header ---------- */
header.site{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:28px;height:64px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:.2px;color:var(--ink);}
.brand img{width:30px;height:30px;}
.brand small{display:block;font-weight:400;font-size:11px;color:var(--muted);letter-spacing:1.6px;line-height:1;}
.nav nav{display:flex;gap:22px;margin-left:auto;flex-wrap:wrap;}
.nav nav a{color:var(--ink-2);font-size:14px;padding:6px 0;border-bottom:2px solid transparent;}
.nav nav a:hover,.nav nav a.on{color:var(--blue);border-bottom-color:var(--cyan);}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;color:#eaf4fb;
  background:
    radial-gradient(900px 420px at 12% -8%,rgba(0,179,200,.36),transparent 62%),
    radial-gradient(760px 400px at 88% 6%,rgba(11,111,184,.5),transparent 60%),
    linear-gradient(160deg,#08243c 0%,#0d3a5c 48%,#0a2c46 100%);
}
.hero::after{
  content:"";position:absolute;inset:0;opacity:.16;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:52px 52px;mask-image:radial-gradient(70% 60% at 50% 40%,#000,transparent 78%);
}
.hero .wrap{position:relative;z-index:2;padding-top:74px;padding-bottom:64px;}
.tag{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:1.4px;
  padding:6px 14px;border-radius:999px;background:rgba(0,179,200,.14);
  border:1px solid rgba(0,179,200,.45);color:#8fe6ef;text-transform:uppercase;}
.hero h1{font-size:clamp(28px,4.4vw,50px);line-height:1.16;margin:20px 0 16px;letter-spacing:-.4px;font-weight:800;}
.hero h1 em{font-style:normal;background:linear-gradient(92deg,#7fe3ef,#b6f0f5);-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero p.lead{font-size:clamp(15px,1.6vw,18.5px);color:#b9d5e8;max-width:800px;}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:10px;
  font-size:14.5px;font-weight:600;border:1px solid transparent;transition:.18s;cursor:pointer;}
.btn-p{background:linear-gradient(96deg,var(--cyan),#0b9fd4);color:#04202f;}
.btn-p:hover{color:#04202f;filter:brightness(1.08);transform:translateY(-1px);}
.btn-g{border-color:rgba(255,255,255,.32);color:#dceaf5;background:rgba(255,255,255,.05);}
.btn-g:hover{background:rgba(255,255,255,.13);color:#fff;}
.btn-o{border-color:var(--line);background:#fff;color:var(--ink-2);}
.btn-o:hover{border-color:var(--cyan);color:var(--blue);}

/* ---------- Stat strip ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));gap:1px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.16);
  border-radius:var(--radius);overflow:hidden;margin-top:44px;}
.stat{background:rgba(6,32,53,.55);padding:20px 18px;}
.stat b{display:block;font-size:27px;font-weight:800;color:#8fe6ef;letter-spacing:-.5px;}
.stat span{font-size:12.5px;color:#a6c4d9;letter-spacing:.4px;}

/* ---------- Section headings ---------- */
.eyebrow{font-size:12.5px;letter-spacing:2.2px;color:var(--cyan);font-weight:700;text-transform:uppercase;}
h2.sec{font-size:clamp(21px,2.6vw,30px);margin:10px 0 12px;letter-spacing:-.3px;font-weight:800;color:var(--ink);}
p.sub{color:var(--muted);max-width:840px;font-size:15px;}

/* ---------- Cards ---------- */
.grid{display:grid;gap:20px;}
.g2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));}
.g3{grid-template-columns:repeat(auto-fit,minmax(272px,1fr));}
.g4{grid-template-columns:repeat(auto-fit,minmax(214px,1fr));}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow);transition:.2s;}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:#c6dcef;}
.card h3{font-size:16.5px;margin-bottom:8px;color:var(--ink);}
.card p{color:var(--muted);font-size:14px;}
.card .ico{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;
  background:var(--cyan-l);color:var(--blue-d);font-weight:800;margin-bottom:14px;font-size:17px;}
.card.clickable{cursor:pointer;}

/* ---------- Table ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);}
table{width:100%;border-collapse:collapse;font-size:13.6px;min-width:640px;}
th,td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line-2);vertical-align:top;}
th{background:#f3f8fc;font-weight:700;color:var(--ink-2);font-size:13px;letter-spacing:.3px;white-space:nowrap;}
tr:last-child td{border-bottom:none;}
tbody tr:hover{background:#fafdff;}

/* ---------- Pills / badges ---------- */
.pill{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11.5px;font-weight:600;
  background:var(--cyan-l);color:var(--blue-d);border:1px solid #c8e9ee;margin:2px 4px 2px 0;white-space:nowrap;}
.pill.q-high{background:#e7f7ee;color:#0b6e40;border-color:#c3e9d5;}
.pill.q-medium{background:#fdf4e3;color:#8a5a11;border-color:#f2e0bd;}
.pill.q-low{background:#f1f3f6;color:#5b6b7a;border-color:#e0e6ec;}
.pill.dark{background:rgba(0,179,200,.16);color:#8fe6ef;border-color:rgba(0,179,200,.4);}

/* ---------- Code ---------- */
pre.code{background:#0c2438;color:#d7e9f5;border-radius:12px;padding:18px 20px;overflow:auto;
  font-size:12.8px;line-height:1.7;border:1px solid #16395a;}
pre.code .k{color:#7fe3ef;} pre.code .s{color:#b6f0b0;} pre.code .c{color:#6b8ba6;font-style:italic;}
code.inl{background:#eef5fa;border:1px solid var(--line);border-radius:5px;padding:1px 6px;
  font-size:12.8px;color:var(--blue-d);}

/* ---------- Forms ---------- */
.form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);}
.frow{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;}
label.f{display:block;font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:6px;}
input.f,select.f{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;
  font-size:14px;font-family:inherit;color:var(--ink);background:#fbfdff;}
input.f:focus,select.f:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(0,179,200,.14);}
.hint{font-size:12px;color:var(--muted);margin-top:4px;}

/* ---------- Accordion ---------- */
.acc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  margin-bottom:12px;overflow:hidden;box-shadow:var(--shadow);}
.acc summary{padding:16px 20px;cursor:pointer;font-weight:700;font-size:15.5px;
  display:flex;align-items:center;gap:12px;list-style:none;}
.acc summary::-webkit-details-marker{display:none;}
.acc summary::after{content:"+";margin-left:auto;font-size:20px;color:var(--cyan);font-weight:400;}
.acc[open] summary::after{content:"–";}
.acc summary .rank{width:26px;height:26px;border-radius:8px;background:var(--cyan-l);color:var(--blue-d);
  display:grid;place-items:center;font-size:12.5px;flex:0 0 auto;}
.acc .body{padding:0 20px 20px;}

/* ---------- Product list ---------- */
.filters{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:18px;}
.filters input.f,.filters select.f{width:auto;min-width:150px;}
#plist{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));}
.pitem{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;
  box-shadow:0 1px 2px rgba(14,28,43,.04);cursor:pointer;transition:.16s;display:flex;flex-direction:column;}
.pitem:hover{border-color:var(--cyan);box-shadow:var(--shadow);}
.pitem .thumb{width:100%;height:158px;object-fit:contain;background:#f2f7fb;padding:8px;border-bottom:1px solid var(--line-2);}
.pitem .thumb.ph{display:grid;place-items:center;color:#a9c2d6;font-size:15px;font-weight:700;letter-spacing:1px;
  background:linear-gradient(140deg,#eef6fc,#e2eef8);}
.pitem .pbody{padding:14px 16px 16px;}
.dhead{display:flex;gap:16px;align-items:flex-start;margin-bottom:14px;}
.dhead .dimg{width:150px;height:112px;object-fit:contain;background:#f2f7fb;border:1px solid var(--line-2);
  border-radius:10px;padding:6px;flex:0 0 auto;}
@media (max-width:560px){ .dhead{flex-direction:column;} .dhead .dimg{width:100%;} }
.pitem .t{font-weight:700;font-size:14.6px;color:var(--ink);line-height:1.5;margin-bottom:6px;}
.pitem .m{font-size:12.4px;color:var(--muted);display:flex;gap:10px;flex-wrap:wrap;}
.pitem .p{font-size:12.6px;color:var(--blue-d);font-weight:600;margin-top:7px;}

/* ---------- Modal ---------- */
.modal{position:fixed;inset:0;background:rgba(8,28,44,.55);display:none;z-index:100;
  padding:40px 20px;overflow:auto;}
.modal.on{display:block;}
.modal .box{max-width:820px;margin:0 auto;background:#fff;border-radius:16px;padding:28px 30px;}
.modal h3{font-size:19px;margin-bottom:6px;}
.modal .close{float:right;cursor:pointer;color:var(--muted);font-size:22px;line-height:1;}

/* ---------- 计算引擎状态徽标 ---------- */
.eng-badge{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;
  padding:5px 13px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--muted);}
.eng-badge::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;flex:0 0 auto;}
.eng-on{background:#e7f7ee;color:#0b6e40;border-color:#c3e9d5;}
.eng-off{background:#fdf4e3;color:#8a5a11;border-color:#f2e0bd;}
.eng-probing{background:#f1f3f6;color:#5b6b7a;}
.engbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:18px;}

/* ---------- 计算器页签 ---------- */
.tabs{display:flex;gap:8px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:24px;}
.tabs button{appearance:none;background:none;border:none;border-bottom:3px solid transparent;
  padding:11px 18px;font:inherit;font-weight:700;font-size:14.2px;color:var(--muted);cursor:pointer;transition:.16s;}
.tabs button:hover{color:var(--blue);}
.tabs button.on{color:var(--blue-d);border-bottom-color:var(--cyan);}
.panel{display:none;} .panel.on{display:block;}

/* ---------- 结果卡 ---------- */
.res{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(178px,1fr));margin:20px 0;}
.res .kv{background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 17px;box-shadow:var(--shadow);}
.res .kv span{display:block;font-size:12.2px;color:var(--muted);letter-spacing:.2px;}
.res .kv b{display:block;font-size:22px;font-weight:800;color:var(--blue-d);letter-spacing:-.4px;margin-top:3px;line-height:1.25;}
.res .kv i{font-style:normal;font-size:12.4px;color:var(--muted);}

/* 校核清单：三态 */
.chk{list-style:none;display:grid;gap:8px;}
.chk li{display:flex;gap:11px;align-items:flex-start;background:#fff;border:1px solid var(--line);
  border-radius:10px;padding:11px 15px;font-size:13.6px;}
.chk li .st{flex:0 0 auto;font-weight:800;font-size:12.4px;padding:2px 9px;border-radius:999px;white-space:nowrap;}
.chk .st.pass{background:#e7f7ee;color:#0b6e40;}
.chk .st.warn{background:#fdf4e3;color:#8a5a11;}
.chk .st.fail{background:#fdecea;color:#a12a24;}
.chk li .tx{flex:1 1 auto;color:var(--ink-2);}
.chk li .tx small{display:block;color:var(--muted);font-size:12.3px;margin-top:3px;}
.spin{display:inline-block;width:15px;height:15px;border:2px solid rgba(11,111,184,.28);
  border-top-color:var(--blue);border-radius:50%;animation:spin .7s linear infinite;vertical-align:-3px;}
@keyframes spin{to{transform:rotate(360deg);}}

/* ---------- Misc ---------- */
.note{background:linear-gradient(96deg,#f0f9fb,#f3f8fc);border:1px solid #cfe8ee;
  border-left:4px solid var(--cyan);border-radius:10px;padding:16px 20px;font-size:13.8px;color:var(--ink-2);}
.note b{color:var(--blue-d);}
.note.warn{background:linear-gradient(96deg,#fdf9f0,#fdf4e3);border-color:#f2e0bd;border-left-color:var(--warn);}
.note.err{background:linear-gradient(96deg,#fdf2f1,#fdecea);border-color:#f2cfcc;border-left-color:var(--risk);}
.check{list-style:none;}
.check li{padding-left:26px;position:relative;margin-bottom:8px;color:var(--ink-2);font-size:14.3px;}
.check li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800;}
.flow{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:13.4px;color:var(--ink-2);}
.flow .step{background:#fff;border:1px solid var(--line);border-radius:9px;padding:8px 14px;box-shadow:var(--shadow);}
.flow .arrow{color:var(--cyan);font-weight:800;}
footer.site{background:#08243c;color:#9dbdd4;padding:44px 0 30px;font-size:13.4px;}
footer.site a{color:#8fe6ef;}
footer.site .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:26px;}
footer.site h4{color:#eaf4fb;font-size:14px;margin-bottom:10px;}
footer.site ul{list-style:none;}
footer.site li{margin-bottom:6px;}
.cr{border-top:1px solid #1b4363;margin-top:28px;padding-top:18px;color:#6f93ad;font-size:12.4px;}
@media (max-width:820px){
  .nav{height:auto;padding:12px 0;flex-wrap:wrap;}
  .nav nav{margin-left:0;gap:14px;}
  section{padding:44px 0;}
}