/* 智引官网首页 — 深色编辑排版（signal orange 单强调色） */
:root{
  --bg:#0a0a0b; --panel:#131315; --line:#26262a; --line2:#3a3a40;
  --txt:#ededed; --sub:#9a9aa0; --dim:#6b6b72;
  --acc:#ff5a00; --acc-ink:#0a0a0b;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--txt);font-family:"Helvetica Neue","PingFang SC","Microsoft YaHei",Arial,sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}
.mono{font-family:"SF Mono","JetBrains Mono","PingFang SC","Microsoft YaHei",monospace}
a{color:inherit;text-decoration:none}
.wrap{max-width:1240px;margin:0 auto;padding:0 32px}
/* header */
header{position:fixed;inset:0 0 auto 0;z-index:100;transition:background .3s,border-color .3s;border-bottom:1px solid transparent}
header.solid{background:rgba(10,10,11,.9);backdrop-filter:blur(10px);border-color:var(--line)}
header .wrap{display:flex;align-items:center;height:64px;gap:34px}
.logo{font-size:17px;font-weight:700;letter-spacing:.5px}
.logo i{font-style:normal;color:var(--acc);margin-right:2px}
.logo small{font-weight:400;color:var(--sub);font-size:12px;margin-left:6px}
header .links{display:flex;gap:26px;font-size:13.5px;color:var(--sub);flex:1;flex-wrap:wrap}
header .links a:hover{color:var(--txt)}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--acc);color:var(--acc-ink);border:none;font-size:14px;font-weight:600;padding:10px 22px;border-radius:999px;cursor:pointer;font-family:inherit;transition:transform .2s}
.btn:hover{transform:translateY(-1px)}
.btn .arr{font-family:"SF Mono",monospace}
.btn.ghost{background:transparent;border:1px solid var(--line2);color:var(--txt)}
.btn.ghost:hover{border-color:var(--txt)}
.kicker{font-family:"SF Mono","JetBrains Mono","PingFang SC",monospace;font-size:12px;letter-spacing:2px;color:var(--acc);text-transform:uppercase}
.kicker::before{content:"";display:inline-block;width:6px;height:6px;background:var(--acc);margin-right:10px;vertical-align:1px}
h2.display{font-size:clamp(30px,4.2vw,52px);line-height:1.28;font-weight:700;letter-spacing:.5px}
.lead{color:var(--sub);font-size:16px;max-width:640px}
section{padding:110px 0;border-bottom:1px solid var(--line)}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:56px;flex-wrap:wrap}
.sec-num{font-family:"SF Mono",monospace;font-size:12px;color:var(--dim);letter-spacing:2px}
/* hero */
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:flex-end;position:relative;border-bottom:1px solid var(--line);overflow:hidden}
.hero .bg{position:absolute;inset:0;background:url("assets/hero.jpg") center/cover no-repeat;opacity:.5}
.hero .shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,10,11,.96) 0%,rgba(10,10,11,.72) 46%,rgba(10,10,11,.25) 100%),linear-gradient(0deg,rgba(10,10,11,.95) 0%,rgba(10,10,11,0) 45%)}
.hero .wrap{position:relative;padding-bottom:64px;padding-top:120px}
.hero h1{font-size:clamp(44px,7.2vw,104px);line-height:1.14;font-weight:700;letter-spacing:1px;max-width:900px}
.hero h1 em{font-style:normal;color:#5d5d64}
.hero .lead{margin:26px 0 34px;font-size:17px}
.hero .row{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.hero .metric{position:relative;margin-top:84px;display:flex;gap:48px;flex-wrap:wrap;align-items:baseline}
.hero .metric .m b{font-family:"SF Mono",monospace;font-size:22px;color:var(--txt)}
.hero .metric .m span{display:block;font-size:12.5px;color:var(--sub);margin-top:2px}
/* facts band */
.facts{padding:0;border-bottom:1px solid var(--line)}
.facts .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.fact{padding:44px 32px;border-left:1px solid var(--line)}
.fact:first-child{border-left:none}
.fact b{font-family:"SF Mono",monospace;font-size:44px;font-weight:500;display:block;line-height:1.1}
.fact b i{font-style:normal;color:var(--acc);font-size:24px;margin-left:2px}
.fact span{color:var(--sub);font-size:13px;display:block;margin-top:8px}
/* pains */
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.pain{padding:36px 30px;border-left:1px solid var(--line)}
.pain:first-child{border-left:none}
.pain .idx{font-family:"SF Mono",monospace;font-size:12px;color:var(--dim);margin-bottom:18px}
.pain h3{font-size:19px;margin-bottom:12px}
.pain p{color:var(--sub);font-size:14px}
/* modules */
.mods{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.mod{background:var(--bg);padding:30px 26px;min-height:190px;display:flex;flex-direction:column;transition:background .25s;position:relative}
.mod:hover{background:var(--panel)}
.mod .n{font-family:"SF Mono",monospace;font-size:11px;color:var(--dim);margin-bottom:auto}
.mod h3{font-size:17px;margin:14px 0 8px}
.mod p{color:var(--sub);font-size:13px}
.mod .plan-tag{position:absolute;top:24px;right:22px;font-size:10.5px;color:var(--acc);border:1px solid var(--acc);border-radius:3px;padding:1px 7px;letter-spacing:1px}
.mods-more{margin-top:28px;font-size:13.5px;color:var(--sub)}
.mods-more a{color:var(--txt);border-bottom:1px solid var(--line2);padding-bottom:2px}
/* statement block */
.statement{background:var(--acc);color:var(--acc-ink);border-radius:14px;padding:clamp(40px,6vw,84px);position:relative}
.statement .kicker{color:var(--acc-ink)}
.statement .kicker::before{background:var(--acc-ink)}
.statement p{font-size:clamp(24px,3.4vw,44px);font-weight:700;line-height:1.4;max-width:980px;margin-top:18px}
.statement p span{opacity:.45}
/* diffs */
.diffs{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.diff{background:var(--bg);padding:32px 26px;min-height:230px}
.diff .ic{width:34px;height:34px;border:1px solid var(--line2);border-radius:6px;display:flex;align-items:center;justify-content:center;font-family:"SF Mono",monospace;font-size:13px;color:var(--acc);margin-bottom:22px}
.diff h3{font-size:18px;margin-bottom:10px}
.diff p{color:var(--sub);font-size:13.5px}
/* architecture */
.arch{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:clamp(28px,4vw,56px)}
.arch .lane{display:flex;align-items:stretch;gap:14px;margin-top:36px}
.arch .box{flex:1;border:1px solid var(--line2);border-radius:8px;padding:26px 22px;background:var(--bg)}
.arch .box b{font-size:16px;display:block;margin-bottom:8px}
.arch .box small{color:var(--sub);font-size:12.5px;line-height:1.8;display:block}
.arch .box.gw{border-color:var(--acc)}
.arch .box.gw .k{font-family:"SF Mono",monospace;font-size:11px;color:var(--acc);letter-spacing:2px;display:block;margin-bottom:8px}
.arch .arr{align-self:center;color:var(--dim);font-family:"SF Mono",monospace;font-size:18px}
.arch ul{list-style:none;margin-top:36px;display:grid;grid-template-columns:1fr 1fr;gap:0 48px}
.arch li{border-top:1px solid var(--line);padding:18px 0;display:flex;gap:16px;font-size:14px;color:var(--sub)}
.arch li b{color:var(--txt);font-weight:600;white-space:nowrap}
/* demos */
.demos{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.demo{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--panel)}
.demo .shot{aspect-ratio:4/3;background:linear-gradient(135deg,#1a1a1e,#101013);display:flex;align-items:center;justify-content:center;color:var(--dim);font-size:12.5px;font-family:"SF Mono",monospace;position:relative}
.demo .shot img{width:100%;height:100%;object-fit:cover;display:block}
.demo .shot i{position:absolute;top:12px;left:12px;font-style:normal;font-size:10.5px;color:var(--acc);border:1px solid var(--acc);border-radius:3px;padding:1px 8px;letter-spacing:1px;font-family:"PingFang SC",sans-serif}
.demo .info{padding:20px}
.demo .info h3{font-size:15.5px;margin-bottom:6px}
.demo .info p{font-size:12.5px;color:var(--sub)}
/* process */
.proc{border:1px solid var(--line);border-radius:8px;overflow:hidden}
.proc .step{display:flex;gap:32px;align-items:baseline;padding:30px 32px;border-top:1px solid var(--line)}
.proc .step:first-child{border-top:none}
.proc .step .no{font-family:"SF Mono",monospace;color:var(--acc);font-size:13px;min-width:44px}
.proc .step h3{font-size:18px;min-width:180px}
.proc .step p{color:var(--sub);font-size:14px;flex:1}
.proc .step .t{font-family:"SF Mono",monospace;font-size:12px;color:var(--dim);white-space:nowrap}
/* cta */
.cta-sec{text-align:center;padding:130px 0}
.cta-sec h2{font-size:clamp(30px,4vw,52px);margin:18px 0 16px}
.cta-sec .lead{margin:0 auto 36px}
.cta-sec .hint{margin-top:22px;font-size:13px;color:var(--dim)}
/* footer — 橙色大块 */
footer.site{background:var(--acc);color:#0a0a0b;overflow:hidden}
footer.site .wrap{padding-top:88px}
footer.site .foot-top{display:flex;justify-content:space-between;align-items:flex-end;gap:36px;padding-bottom:60px;border-bottom:1px solid rgba(10,10,11,.28);flex-wrap:wrap}
footer.site .foot-display{font-size:clamp(32px,4.6vw,60px);line-height:1.2;font-weight:700;letter-spacing:1px;max-width:660px}
footer.site .foot-lead{margin-top:20px;font-size:15px;color:rgba(10,10,11,.72);max-width:540px}
.btn.dark{background:#0a0a0b;color:#ededed}
.btn.dark:hover{transform:translateY(-1px)}
footer.site .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:40px;padding:54px 0}
footer.site h4{font-family:"SF Mono","JetBrains Mono","PingFang SC",monospace;font-size:11.5px;letter-spacing:2px;color:rgba(10,10,11,.55);margin-bottom:18px}
footer.site p,footer.site a{color:rgba(10,10,11,.82);font-size:13.5px;display:block;margin-bottom:8px}
footer.site a:hover{color:#0a0a0b}
footer.site .brand-note{color:rgba(10,10,11,.82)}
footer.site .brand-note b{display:block;font-size:15px;color:#0a0a0b;margin-bottom:10px;font-family:inherit}
footer.site .qr{width:112px;background:#fff;border-radius:8px;padding:8px;margin-top:2px}
footer.site .qr img{width:100%;display:block;border-radius:3px}
footer.site .icp{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:22px 0;border-top:1px solid rgba(10,10,11,.28);font-family:"SF Mono","JetBrains Mono",monospace;font-size:11.5px;letter-spacing:1px;color:rgba(10,10,11,.68)}
footer.site .icp a{display:inline;color:rgba(10,10,11,.68)}
footer.site .icp a:hover{color:#0a0a0b;border-bottom:1px solid #0a0a0b}
footer.site .giant{font-size:clamp(130px,24vw,400px);font-weight:800;line-height:.74;text-align:center;letter-spacing:4px;color:#0a0a0b;transform:translateY(16%);user-select:none;white-space:nowrap}
/* qr modal */
.modal{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:200;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
.modal.show{display:flex}
.modal .box{background:var(--panel);border:1px solid var(--line2);border-radius:12px;padding:36px;text-align:center;width:320px}
.modal .box h4{margin-bottom:6px}
.modal .box .sub{font-size:13px;color:var(--sub);margin-bottom:16px}
.modal .qr{width:204px;background:#fff;border-radius:10px;padding:10px;margin:0 auto}
.modal .qr img{width:100%;display:block;border-radius:4px}
.modal .close{margin-top:18px;font-size:13px;color:var(--dim);cursor:pointer}
/* reveal */
.rv{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.rv.on{opacity:1;transform:none}
@media(max-width:1000px){.mods,.diffs{grid-template-columns:repeat(2,1fr)}.facts .wrap{grid-template-columns:repeat(2,1fr)}.fact:nth-child(3){border-left:none}.pains{grid-template-columns:1fr}.pain{border-left:none;border-top:1px solid var(--line)}.pain:first-child{border-top:none}.demos{grid-template-columns:1fr}.arch .lane{flex-direction:column}.arch .arr{transform:rotate(90deg)}.arch ul{grid-template-columns:1fr}.proc .step{flex-wrap:wrap;gap:10px}footer.site .cols{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.mods,.diffs,.facts .wrap{grid-template-columns:1fr}.fact{border-left:none;border-top:1px solid var(--line)}.fact:first-child{border-top:none}}