:root{--fg:#1d1d1f;--mut:#6e6e73;--bg:#fff;--alt:#f5f5f7;--acc:#0071e3;--ok:#34c759;--r:14px;--err:#d70015;--warn:#c93400}
*{box-sizing:border-box}body{margin:0;font:17px/1.6 -apple-system,"PingFang SC","Helvetica Neue",sans-serif;color:var(--fg);background:var(--bg)}
nav{position:sticky;top:0;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid #e5e5ea;z-index:9}
nav div{max-width:980px;margin:auto;display:flex;gap:18px;padding:12px 20px;overflow-x:auto;white-space:nowrap}
nav a{color:var(--fg);text-decoration:none;font-size:14px}nav a.on{color:var(--acc);font-weight:600}
main{max-width:980px;margin:auto;padding:24px 20px 80px}
h1{font-size:40px;line-height:1.15;margin:32px 0 12px}h2{font-size:28px;margin:56px 0 12px}h3{font-size:20px;margin:28px 0 8px}
.lead{font-size:21px;color:var(--mut)}
.tldr{background:var(--alt);border-radius:var(--r);padding:18px 22px;margin:16px 0}
.tldr b{color:var(--acc)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:20px 0}
.card{background:var(--alt);border-radius:var(--r);padding:20px;text-decoration:none;color:var(--fg)}
.card h3{margin:0 0 6px}
table{width:100%;border-collapse:collapse;margin:12px 0;font-size:15px;display:block;overflow-x:auto}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid #e5e5ea;vertical-align:top}th{background:var(--alt)}
.term{border-left:3px solid var(--acc);padding:4px 14px;margin:10px 0}
.mermaid{background:#fff;border:1px solid #e5e5ea;border-radius:var(--r);padding:12px;margin:16px 0;overflow-x:auto}
code{background:var(--alt);padding:1px 6px;border-radius:6px}
footer{color:var(--mut);font-size:13px;text-align:center;padding:30px}
/* prototype */
.phone{max-width:390px;margin:16px auto;border:1px solid #d2d2d7;border-radius:28px;padding:18px;min-height:560px;background:#fff;box-shadow:0 10px 40px rgba(0,0,0,.08)}
.tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin:16px 0}
.tabs button,.btn{border:0;border-radius:980px;padding:10px 18px;font-size:15px;background:var(--alt);cursor:pointer}
.tabs button.on,.btn.pri{background:var(--acc);color:#fff}
.screen{display:none}.screen.on{display:block}
.steps{display:flex;gap:6px;margin-bottom:14px}.steps i{flex:1;height:4px;border-radius:2px;background:#e5e5ea}.steps i.on{background:var(--acc)}
label{display:block;font-size:13px;color:var(--mut);margin:12px 0 4px}
input,select{width:100%;padding:12px;border:1px solid #d2d2d7;border-radius:10px;font-size:16px}
.kpi{display:grid;grid-template-columns:1fr 1fr;gap:10px}.kpi div{background:var(--alt);border-radius:12px;padding:12px}.kpi b{display:block;font-size:22px}
.bar{height:8px;background:#e5e5ea;border-radius:4px;overflow:hidden}.bar span{display:block;height:100%;background:var(--acc)}
.row{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid #f0f0f0;font-size:15px}
@media(max-width:600px){h1{font-size:30px}h2{font-size:23px}body{font-size:16px}}
.ok{color:var(--ok)}.mut{color:var(--mut)}.warn{color:#b25000}.small{font-size:14px;color:var(--mut)}
.tag{display:inline-block;background:var(--alt);color:var(--mut);border-radius:980px;padding:2px 10px;font-size:13px}
nav a{min-height:44px;display:inline-flex;align-items:center}
.tabs button,.btn{min-height:44px}input,select{min-height:44px}
.delta{display:block;font-size:12px;color:var(--mut)}
.chain{counter-reset:c;list-style:none;padding:0}.chain li{counter-increment:c;background:var(--alt);border-radius:var(--r);padding:14px 18px;margin:10px 0}
.chain li::before{content:counter(c);display:inline-block;width:26px;height:26px;border-radius:50%;background:var(--acc);color:#fff;text-align:center;line-height:26px;margin-right:10px;font-size:14px}
@media(max-width:600px){table{display:block}table tr:first-child{display:none}table tr{display:block;background:var(--alt);border-radius:12px;margin:10px 0;padding:6px 12px}
table td{display:block;border:0;padding:4px 0}table td::before{content:attr(data-l);display:block;font-size:12px;color:var(--mut)}}
/* round 2 */
nav .nw{display:flex;flex-wrap:wrap;gap:4px 22px;max-width:980px;margin:auto;padding:6px 20px;overflow:visible;white-space:normal}
nav .ng{display:flex;flex-wrap:wrap;align-items:center;gap:0 14px;padding:0}
nav .ng span{font-size:11px;color:var(--mut);letter-spacing:.05em;margin-right:2px}
@media(max-width:600px){nav{position:static}nav .nw{display:block;padding:6px 16px}nav .ng{gap:0 12px;border-bottom:1px solid #f0f0f0}nav .ng:last-child{border:0}nav .ng span{width:100%;margin-top:4px}}
.chain li a{color:var(--fg);text-decoration:none;display:block;min-height:44px}.chain li:hover{background:#ebebf0}
details.url{background:var(--alt);border-radius:12px;padding:12px 14px;margin:12px 0}details.url summary{cursor:pointer;min-height:44px;display:flex;align-items:center;color:var(--acc)}
pre.code{white-space:pre-wrap;word-break:break-all;font-size:13px;margin:8px 0 0}
.wide{width:100%;margin-top:12px}.gate{max-width:420px;margin:40px auto}
.err{color:#c9302c}.errbox{background:#fdecea!important;color:#c9302c}
.btn.danger{background:#fdecea;color:#c9302c}
.skel{display:block;height:1.2em;border-radius:6px;background:linear-gradient(90deg,#eee,#f7f7f7,#eee);background-size:200% 100%;animation:sk 1.2s infinite}
.skel-card{height:120px;margin:12px 0;background:linear-gradient(90deg,#eee,#f7f7f7,#eee);background-size:200% 100%;animation:sk 1.2s infinite}
@keyframes sk{to{background-position:-200% 0}}
section[hidden]{display:none}
/* v4 */
nav .bar{display:none}
@media(max-width:600px){nav{position:sticky}nav .bar{display:flex;justify-content:space-between;align-items:center;padding:0 16px;gap:8px}
nav .bar .home{font-weight:600}.navt{background:none;border:0;font:inherit;font-size:14px;color:var(--acc);min-height:44px;padding:0 4px}
nav .nw{display:none}nav.open .nw{display:block;max-height:70vh;overflow:auto}}
.mx{font-size:14px;color:var(--mut)}.toc{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:14px}
.pnav{display:flex;justify-content:space-between;gap:12px;margin:40px 0 8px;flex-wrap:wrap}.pnav a{font-weight:600}
.chain{padding-left:20px}.chain li{margin:8px 0}.chain a{color:var(--fg);text-decoration:none}
tr.hl td{background:#fff8e1}tr[hidden]{display:none}
select{font:inherit;padding:10px;border:1px solid #d2d2d7;border-radius:10px;max-width:100%;margin:4px 0 12px}
.funnel div{display:flex;flex-direction:column;margin:8px 0;font-size:14px}.funnel i{display:block;height:18px;background:var(--acc);border-radius:6px;margin-top:4px}
.w100{width:100%}.w60{width:60%}.w35{width:35%}.w15{width:15%}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:12px 0}.kpi{background:var(--alt);border-radius:12px;padding:10px}.kpi span{font-size:12px;color:var(--mut);display:block}.kpi b{font-size:20px}
.svg{width:100%;height:auto;display:block}.svg text{font-size:9px;fill:var(--mut)}.s-recv{fill:#d2d2d7}.s-pass{fill:var(--acc)}.s-lim{stroke:var(--err);stroke-width:2;stroke-dasharray:4 3}
.hb{display:grid;grid-template-columns:minmax(0,1.4fr) 1fr auto;gap:8px;align-items:center;margin:6px 0;font-size:14px}.hb a{overflow-wrap:anywhere}.hb i{background:var(--alt);border-radius:6px;height:14px;display:block}.hb u{display:block;height:14px;background:var(--err);border-radius:6px;width:0}
.ok{color:var(--ok)}.bad{color:var(--err)}.warn{color:var(--warn);font-weight:600}
details.raw{border-bottom:1px solid #eee;padding:6px 0;font-size:13px}details.raw pre{white-space:pre-wrap;overflow-wrap:anywhere}
.btns{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}.ck{display:inline-flex;gap:6px;align-items:center;margin:4px 12px 4px 0}
fieldset{border:1px solid #e5e5ea;border-radius:12px;padding:8px 12px;margin:10px 0}.row{margin-top:16px}
.stp{display:flex;list-style:none;padding:0;gap:4px;counter-reset:s}.stp li{flex:1;text-align:center;font-size:12px;padding:6px 0;border-top:3px solid #e5e5ea;color:var(--mut)}.stp li.on{border-color:var(--acc);color:var(--fg)}
.pace{position:relative;height:12px;background:var(--alt);border-radius:6px;margin:8px 0}.pace u{display:block;height:12px;background:var(--acc);border-radius:6px}.pace em{position:absolute;top:-4px;width:2px;height:20px;background:var(--fg)}
.lk h3{overflow-wrap:anywhere}
.kpis .kpi{display:block;text-align:left}.kpis .kpi b{display:block;font-size:18px;white-space:nowrap}
/* v5 */
.am{border:1px solid #e5e5ea;border-radius:12px;padding:10px;background:#fff}
.amtop{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.dft{font-size:13px;color:var(--warn)}
.lv{display:flex;gap:4px;border-bottom:1px solid var(--alt);margin-bottom:8px}
.lv button{flex:1;border:0;background:none;padding:8px 2px;font:inherit;font-size:14px;color:var(--mut);border-bottom:2px solid transparent}
.lv button.on{color:var(--acc);border-bottom-color:var(--acc);font-weight:600}
.lv i{font-style:normal;font-size:12px;color:var(--mut)}
.tb{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:6px}.tb select{width:auto;flex:1;min-width:120px;margin:0}
.tw{overflow-x:auto;max-width:100%}
table.amt{min-width:640px;font-size:13px}table.amt td,table.amt th{white-space:nowrap;display:table-cell}table.amt td::before{content:none!important}
table.amt tr.sub td{color:#6e6e73}
.sw{position:relative;display:inline-block;width:36px;height:20px}.sw input{opacity:0;width:0;height:0}
.sw span{position:absolute;inset:0;background:#d2d2d7;border-radius:20px;transition:.2s}.sw span:before{content:"";position:absolute;width:16px;height:16px;left:2px;top:2px;background:#fff;border-radius:50%;transition:.2s}
.sw input:checked+span{background:var(--ok)}.sw input:checked+span:before{transform:translateX(16px)}
.drw{position:fixed;inset:0;background:rgba(0,0,0,.3);z-index:50;display:flex;justify-content:flex-end}.drw[hidden]{display:none}
.dwb{background:#fff;width:min(420px,100%);height:100%;overflow:auto;padding:16px}
.pill{display:inline-block;padding:2px 8px;border-radius:10px;background:#f2f2f7;font-size:12px;margin:2px}
table.amt{display:table!important;border-collapse:collapse}table.amt tr{display:table-row!important;background:none!important;border:0!important;margin:0!important;padding:0!important;box-shadow:none!important}
table.amt th,table.amt td{display:table-cell!important;padding:8px 10px!important;border-bottom:1px solid #e5e5ea;text-align:left;vertical-align:middle}
table.amt tr:first-child{display:table-row!important}table.amt th{background:#f5f5f7;font-weight:600;font-size:12px;color:#6e6e73}

/* v6 */
.bar{display:flex;align-items:center;gap:8px}.bar .cons{margin-left:auto;font-size:13px;color:var(--mut);text-decoration:none}
.hang{display:inline-block;font-size:13px;color:var(--mut);background:var(--alt);border-radius:8px;padding:2px 10px;margin:0 0 8px}
i.demo{font-style:normal;font-size:11px;color:var(--mut);background:var(--alt);border-radius:6px;padding:0 5px;margin-left:4px}
a.rs{font-size:14px;font-weight:400;margin-left:8px;color:var(--acc)}
.alertbar{background:#fff4e5;color:var(--warn);border-radius:10px;padding:8px 12px;font-size:14px}
.crumb{font-size:13px;color:var(--mut);margin:0 0 6px}.crumb a{color:var(--acc)}
.pop{display:flex;flex-wrap:wrap;gap:6px;background:var(--alt);border-radius:10px;padding:8px;margin-bottom:8px}.pop[hidden]{display:none}.pop label{width:100%;margin:0}.pop select{margin:0 0 4px}
.mb{display:none}
.acard{border:1px solid var(--alt);border-radius:12px;padding:10px;margin-bottom:8px}.acard.off{opacity:.6}
.ah{display:flex;align-items:center;gap:8px}.ah a{flex:1;font-weight:600;color:var(--fg);text-decoration:none;overflow:hidden;text-overflow:ellipsis}
.as{font-size:12px;color:var(--mut);display:flex;flex-wrap:wrap;gap:4px 12px;margin:4px 0}
.an{display:flex;gap:8px;align-items:center}.an div{flex:1;background:var(--alt);border-radius:8px;padding:6px 8px}.an span{display:block;font-size:11px;color:var(--mut)}.an b{font-size:16px}
.btn.sm{padding:6px 10px;font-size:13px}
.ab{font-size:12px;color:var(--mut);display:flex;gap:12px;margin-top:6px}
.dk{overflow-x:auto}
@media (max-width:700px){.dk{display:none}.mb{display:block}}
.ah input[type=checkbox]{width:auto;flex:none;margin:0}.ah .sw{flex:none}.ah a{min-width:0}