:root{
  --bg:#0c1118;
  --bg2:#101823;
  --panel:#141d29;
  --panel2:#182333;
  --line:rgba(255,255,255,.09);
  --line2:rgba(255,255,255,.16);
  --text:#e9eef5;
  --muted:#93a1b5;
  --dim:#6b7a8f;
  --amber:#f5b74b;
  --amber2:#ffd27a;
  --mint:#5ce0b3;
  --red:#ff7a85;
  --blue:#7db8ff;
  --r:16px;
  --max:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(720px 420px at 78% -8%,rgba(245,183,75,.13),transparent 65%),
    radial-gradient(600px 380px at 8% 12%,rgba(92,224,179,.08),transparent 60%),
    linear-gradient(180deg,#0b1017 0%,#0c1118 60%,#0a0f15 100%);
}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.narrow{max-width:820px}

/* nav */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(12,17,24,.78);border-bottom:1px solid var(--line)}
.nav-in{max-width:var(--max);margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.2px}
.brand .dot{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--amber),#e07a2f);display:grid;place-items:center;color:#1a1206;font-size:14px;font-weight:900}
.nav-links{display:flex;gap:22px;font-size:14px;color:var(--muted)}
.nav-links a:hover{color:var(--text)}
.nav-cta{font-size:13px;padding:8px 14px;border:1px solid var(--line2);border-radius:999px;color:var(--text);white-space:nowrap}
.nav-cta:hover{border-color:var(--amber);color:var(--amber)}

/* hero */
.hero{padding:76px 0 40px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.12em;color:var(--amber);border:1px solid rgba(245,183,75,.28);background:rgba(245,183,75,.07);padding:6px 12px;border-radius:999px;margin-bottom:22px}
.eyebrow i{width:6px;height:6px;border-radius:50%;background:var(--amber);display:inline-block;box-shadow:0 0 10px var(--amber)}
h1{font-size:clamp(30px,4.6vw,54px);line-height:1.18;letter-spacing:-.02em;font-weight:800}
h1 .hl{background:linear-gradient(180deg,var(--amber2),var(--amber));-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{margin-top:20px;font-size:clamp(15px,1.6vw,18px);color:var(--muted);max-width:760px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{display:inline-flex;align-items:center;gap:9px;padding:12px 22px;border-radius:12px;font-weight:650;font-size:15px;border:1px solid transparent;transition:.18s;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--amber),#e89a2f);color:#1b1204;box-shadow:0 8px 26px rgba(245,183,75,.22)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 34px rgba(245,183,75,.3)}
.btn-ghost{border-color:var(--line2);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--amber);color:var(--amber)}
.hero-meta{display:flex;flex-wrap:wrap;gap:26px;margin-top:34px;padding-top:24px;border-top:1px solid var(--line)}
.hero-meta div{font-size:13px;color:var(--dim)}
.hero-meta b{display:block;font-size:20px;color:var(--text);font-weight:700;letter-spacing:-.01em}

/* section */
section{padding:64px 0}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:30px}
.sec-head h2{font-size:clamp(22px,2.8vw,32px);letter-spacing:-.01em}
.sec-head p{color:var(--dim);font-size:14px;max-width:560px;margin-top:8px}
.sec-tag{font-size:12px;color:var(--amber);letter-spacing:.14em;margin-bottom:10px}

/* thesis */
.thesis{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}
.thesis-card{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:28px}
.thesis-card h3{font-size:19px;margin-bottom:12px}
.thesis-card p{color:var(--muted);font-size:14.5px}
.thesis-list{display:grid;gap:12px;margin-top:18px}
.thesis-item{display:flex;gap:12px;align-items:flex-start;font-size:14px;color:var(--muted)}
.thesis-item span.n{flex:0 0 24px;height:24px;border-radius:7px;background:rgba(92,224,179,.12);color:var(--mint);display:grid;place-items:center;font-size:12px;font-weight:700;margin-top:2px}
.quote{background:rgba(245,183,75,.06);border:1px solid rgba(245,183,75,.18);border-radius:var(--r);padding:26px;display:flex;flex-direction:column;justify-content:center}
.quote blockquote{font-size:17px;line-height:1.75;color:var(--text)}
.quote .from{margin-top:14px;font-size:12.5px;color:var(--dim)}

/* cards */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{position:relative;background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:24px;transition:.2s;overflow:hidden}
.card:hover{transform:translateY(-3px);border-color:var(--line2);box-shadow:0 18px 40px rgba(0,0,0,.28)}
.card.top{border-color:rgba(245,183,75,.38)}
.card.top::after{content:"主推";position:absolute;top:14px;right:14px;font-size:11px;letter-spacing:.08em;color:#1b1204;background:var(--amber);padding:3px 9px;border-radius:999px;font-weight:800}
.card .kicker{font-size:11.5px;color:var(--dim);letter-spacing:.1em;text-transform:uppercase}
.card h3{font-size:19px;margin:8px 0 10px;letter-spacing:-.01em}
.card .pain{font-size:13.8px;color:var(--muted);min-height:66px}
.card .scores{display:grid;gap:7px;margin:16px 0 14px;padding-top:14px;border-top:1px dashed var(--line)}
.score-row{display:grid;grid-template-columns:72px 1fr 28px;align-items:center;gap:10px;font-size:11.5px;color:var(--dim)}
.bar{height:5px;border-radius:99px;background:rgba(255,255,255,.07);overflow:hidden}
.bar i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--mint),#8ff0cd)}
.score-row b{color:var(--muted);font-weight:600;text-align:right}
.card .signal{font-size:12.5px;color:var(--mint);background:rgba(92,224,179,.07);border:1px solid rgba(92,224,179,.16);border-radius:9px;padding:9px 11px;line-height:1.55}
.card .foot{display:flex;align-items:center;justify-content:space-between;margin-top:16px;font-size:12.5px;color:var(--dim)}
.card .foot .tag{color:var(--amber)}
.card .total{font-size:13px;color:var(--text);font-weight:700}
.card .total em{font-style:normal;color:var(--amber);font-size:18px}

/* table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--panel)}
table{width:100%;border-collapse:collapse;min-width:760px;font-size:13.5px}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:12px;color:var(--dim);font-weight:600;letter-spacing:.05em;background:rgba(255,255,255,.02)}
td{color:var(--muted)}
td b{color:var(--text);font-weight:650}
tr:last-child td{border-bottom:none}
.pill{display:inline-block;font-size:11.5px;padding:2px 9px;border-radius:999px;border:1px solid var(--line2);color:var(--muted);white-space:nowrap}
.pill.hot{color:var(--amber);border-color:rgba(245,183,75,.35);background:rgba(245,183,75,.07)}
.pill.cool{color:var(--blue);border-color:rgba(125,184,255,.3);background:rgba(125,184,255,.07)}

/* avoid */
.avoid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.avoid .item{border:1px solid rgba(255,122,133,.2);background:rgba(255,122,133,.04);border-radius:14px;padding:20px}
.avoid h4{font-size:15px;color:var(--red);margin-bottom:7px}
.avoid p{font-size:13.5px;color:var(--muted)}

/* steps */
.steps{display:grid;gap:14px}
.step{display:grid;grid-template-columns:64px 1fr;gap:18px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 22px}
.step .d{font-size:12px;color:var(--amber);letter-spacing:.08em;font-weight:700;padding-top:2px}
.step h4{font-size:16px;margin-bottom:5px}
.step p{font-size:13.8px;color:var(--muted)}
.step .out{font-size:12.5px;color:var(--mint);margin-top:7px}

/* demo */
.demo-shell{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;align-items:start}
.panel{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:24px}
.panel h3{font-size:17px;margin-bottom:12px}
.scenario-tabs{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}
.tab{font-size:13px;padding:8px 14px;border-radius:10px;border:1px solid var(--line2);color:var(--muted);cursor:pointer;background:transparent}
.tab.active{background:rgba(245,183,75,.1);border-color:rgba(245,183,75,.4);color:var(--amber)}
.brief{font-size:14px;color:var(--muted);line-height:1.7}
.brief .who{color:var(--text);font-weight:650}
.chat{display:flex;flex-direction:column;gap:12px;min-height:210px;margin:18px 0}
.msg{max-width:88%;padding:12px 15px;border-radius:14px;font-size:14px;line-height:1.65}
.msg.ai{background:var(--panel2);border:1px solid var(--line);border-bottom-left-radius:4px;align-self:flex-start}
.msg.me{background:rgba(245,183,75,.12);border:1px solid rgba(245,183,75,.25);border-bottom-right-radius:4px;align-self:flex-end;color:#ffe9bd}
.msg .who{display:block;font-size:11px;color:var(--dim);margin-bottom:4px;letter-spacing:.06em}
.options{display:grid;gap:9px}
.opt{text-align:left;background:rgba(255,255,255,.025);border:1px solid var(--line);color:var(--text);border-radius:11px;padding:12px 14px;font-size:13.8px;line-height:1.6;cursor:pointer;transition:.15s;font-family:inherit}
.opt:hover{border-color:var(--amber);background:rgba(245,183,75,.06)}
.opt:disabled{opacity:.45;cursor:default}
.opt .lab{display:inline-block;font-size:11px;color:var(--amber);margin-right:7px;font-weight:700}
.think{background:rgba(125,184,255,.05);border:1px solid rgba(125,184,255,.18);border-radius:14px;padding:18px;min-height:110px}
.think .hd{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--blue);letter-spacing:.08em;margin-bottom:10px}
.think p{font-size:13.6px;color:var(--muted);line-height:1.72}
.meters{display:grid;gap:12px;margin-top:18px}
.meter .top{display:flex;justify-content:space-between;font-size:12px;color:var(--dim);margin-bottom:5px}
.meter .bar{height:7px}
.meter .bar i{transition:width .35s ease}
.meter.stance i{background:linear-gradient(90deg,var(--amber),#ffe0a0)}
.meter.evidence i{background:linear-gradient(90deg,var(--blue),#b7d7ff)}
.meter.relation i{background:linear-gradient(90deg,var(--mint),#a8f4dc)}
.result{margin-top:16px;border-top:1px dashed var(--line);padding-top:16px;display:none}
.result.show{display:block}
.result h4{font-size:16px;margin-bottom:8px}
.result p{font-size:13.5px;color:var(--muted);margin-bottom:6px}
.result .score{font-size:26px;font-weight:800;color:var(--amber);letter-spacing:-.02em}
.result .next{font-size:13px;color:var(--mint);margin-top:8px}
.disclaimer{font-size:11.5px;color:var(--dim);margin-top:14px;line-height:1.6}

/* callout */
.callout{border:1px solid rgba(92,224,179,.18);background:rgba(92,224,179,.05);border-radius:14px;padding:20px;font-size:14px;color:var(--muted)}
.callout b{color:var(--mint)}

/* footer */
.footer{border-top:1px solid var(--line);padding:34px 0 44px;margin-top:30px;color:var(--dim);font-size:12.5px}
.footer-in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
.footer a:hover{color:var(--amber)}
.footer .brand{font-size:13px;color:var(--muted)}

@media (max-width:900px){
  .thesis,.demo-shell{grid-template-columns:1fr}
  .grid{grid-template-columns:repeat(2,1fr)}
  .avoid{grid-template-columns:1fr}
  .nav-links{display:none}
}
@media (max-width:620px){
  .grid{grid-template-columns:1fr}
  .hero{padding:52px 0 26px}
  section{padding:46px 0}
  .hero-meta{gap:18px}
  .step{grid-template-columns:1fr;gap:6px}
  .nav-cta{display:inline-flex;font-size:12px;padding:7px 11px}
  .chat{min-height:120px}
  .wrap{padding:0 18px}
}