/* ============ 設計代幣 ============ */
:root{
  --bg:#070a12;
  --bg-2:#0b1020;
  --panel:#101728;
  --panel-2:#141d31;
  --line:#22304e;
  --grid:#18223a;
  --text:#e7ecf7;
  --muted:#8d9bba;
  --accent:#7b95ff;
  --accent-2:#2bb3a3;
  --warn:#e0725f;
  --gold:#d8a12f;
  --violet:#8b7cf0;

  --st-W:#e0725f;
  --st-N1:#d8a12f;
  --st-N2:#2bb3a3;
  --st-N3:#8b7cf0;
  --st-R:#4aa3e8;

  --nav-h:58px;
  --maxw:1120px;
  --r:14px;
  --sans:"Noto Sans TC", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

*{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-snap-type:y proximity;
  -webkit-text-size-adjust:100%;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto; scroll-snap-type:none}
}
body{
  margin:0;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(139,124,240,.07) 0%, transparent 60%),
    radial-gradient(900px 520px at 12% 4%, rgba(123,149,255,.10) 0%, transparent 58%),
    radial-gradient(800px 600px at 90% 40%, rgba(43,179,163,.06) 0%, transparent 60%),
    var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}

/* ============ 進度條 ============ */
.progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:60;background:transparent}
.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .12s linear}

/* ============ 頂部導覽 ============ */
.topbar{
  position:sticky;top:0;z-index:50;height:var(--nav-h);
  display:flex;align-items:center;gap:18px;
  padding:0 20px;
  background:rgba(7,10,18,.82);
  backdrop-filter:blur(14px) saturate(140%);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:0 0 auto}
.brand-mark{
  width:22px;height:22px;border-radius:50%;
  background:radial-gradient(circle at 34% 32%, #e7ecf7 0 42%, transparent 43%), linear-gradient(140deg,var(--accent),var(--violet));
  box-shadow:0 0 16px rgba(123,149,255,.55);
}
.brand-text{font-weight:700;font-size:.95rem;letter-spacing:.02em;white-space:nowrap}
.brand-text em{font-style:normal;color:var(--accent);margin:0 2px}

.tabs{display:flex;gap:2px;overflow-x:auto;flex:1;scrollbar-width:none;mask-image:linear-gradient(90deg,transparent 0,#000 12px,#000 calc(100% - 12px),transparent 100%)}
.tabs::-webkit-scrollbar{display:none}
.tabs a{
  flex:0 0 auto;padding:6px 12px;border-radius:999px;
  font-size:.82rem;color:var(--muted);text-decoration:none;white-space:nowrap;
  transition:color .2s, background .2s;
}
.tabs a:hover{color:var(--text);background:rgba(123,149,255,.10)}
.tabs a.active{color:#0a0e18;background:linear-gradient(120deg,var(--accent),#a5b4ff);font-weight:600}
.tabs a .n{font-family:var(--mono);opacity:.6;margin-right:5px;font-size:.78em}
.tabs a.active .n{opacity:.7}
.tabs-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:8px;padding:4px 10px;font-size:1rem}

/* ============ 章節 ============ */
.chapter{
  scroll-snap-align:start;
  scroll-margin-top:var(--nav-h);
  min-height:calc(100vh - var(--nav-h));
  padding:64px 20px 88px;
  display:flex;align-items:center;
  border-top:1px solid transparent;
  position:relative;
}
.chapter:nth-of-type(even){background:linear-gradient(180deg, rgba(16,23,40,.45), rgba(16,23,40,0) 70%)}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto}

.kicker{
  font-family:var(--mono);font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);margin:0 0 6px;
}
h1{font-size:clamp(2.1rem,5.4vw,3.5rem);line-height:1.18;margin:.1em 0 .45em;font-weight:700;letter-spacing:-.01em}
h1 em{font-style:normal;background:linear-gradient(120deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
h2{font-size:clamp(1.55rem,3.2vw,2.15rem);line-height:1.3;margin:0 0 .6em;font-weight:700;letter-spacing:-.005em}
h3{font-size:1.03rem;margin:0 0 .5em;font-weight:600}
.sub-h{font-size:1.15rem;margin:44px 0 16px;padding-left:12px;border-left:3px solid var(--accent)}
.intro{font-size:1.06rem;color:#c3cde4;max-width:74ch;margin:0 0 28px}
p{margin:0 0 1em}
strong{color:#fff;font-weight:600}
code{font-family:var(--mono);font-size:.88em;background:rgba(123,149,255,.12);color:#c2cffd;padding:1px 5px;border-radius:4px}
a{color:var(--accent)}
sup a{text-decoration:none;font-size:.78em;padding:0 1px}

/* ============ 封面 ============ */
.hero{padding-top:48px}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:52px;align-items:center}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin:0}
.lead{font-size:1.04rem;color:#c3cde4;max-width:60ch}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0 34px}
.btn{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 18px;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.03);color:var(--text);
  font-family:var(--sans);font-size:.88rem;font-weight:500;cursor:pointer;text-decoration:none;
  transition:border-color .2s, background .2s, transform .12s;
}
.btn:hover{border-color:var(--accent);background:rgba(123,149,255,.12)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.42;cursor:not-allowed}
.btn-primary{background:linear-gradient(120deg,var(--accent),#9aabff);border-color:transparent;color:#080c16;font-weight:600}
.btn-primary:hover{background:linear-gradient(120deg,#8ea6ff,#adbaff)}

.hero-stats{list-style:none;display:flex;gap:34px;padding:0;margin:0;flex-wrap:wrap}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats b{font-family:var(--mono);font-size:1.7rem;font-weight:600;line-height:1;color:var(--accent-2)}
.hero-stats span{font-size:.76rem;color:var(--muted);margin-top:5px;letter-spacing:.08em}

.hero-panel{
  background:linear-gradient(170deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden;
  box-shadow:0 26px 70px -28px rgba(0,0,0,.9), inset 0 1px 0 rgba(255,255,255,.04);
}
.panel-head,.panel-foot{
  display:flex;justify-content:space-between;align-items:center;
  padding:11px 16px;font-family:var(--mono);font-size:.74rem;color:var(--muted);
}
.panel-head{border-bottom:1px solid var(--line);gap:8px;justify-content:flex-start}
.panel-foot{border-top:1px solid var(--line)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--accent-2);box-shadow:0 0 10px var(--accent-2);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
#heroCanvas{display:block;width:100%;height:230px}

.scroll-cue{position:absolute;bottom:26px;left:50%;transform:translateX(-50%)}
.scroll-cue span{
  display:block;width:22px;height:34px;border:1.5px solid var(--line);border-radius:12px;position:relative;
}
.scroll-cue span::after{
  content:"";position:absolute;left:50%;top:7px;width:3px;height:6px;border-radius:2px;background:var(--accent);
  transform:translateX(-50%);animation:cue 1.9s ease-in-out infinite;
}
@keyframes cue{0%{opacity:0;transform:translate(-50%,0)}35%{opacity:1}100%{opacity:0;transform:translate(-50%,13px)}}

/* ============ 卡片 ============ */
.cards-3,.cards-2{display:grid;gap:16px;margin:26px 0}
.cards-3{grid-template-columns:repeat(3,1fr)}
.cards-2{grid-template-columns:repeat(2,1fr)}
.cards-3.tight .card{padding:18px}
.card{
  background:linear-gradient(170deg,rgba(20,29,49,.9),rgba(16,23,40,.55));
  border:1px solid var(--line);border-radius:var(--r);padding:22px;
}
.card h3{color:var(--accent);font-size:.98rem}
.card p{font-size:.92rem;color:#b9c4dd;margin:0 0 .6em}
.card p:last-child{margin-bottom:0}
.card .sub{color:var(--muted);font-size:.86rem}
.card.accent{border-color:rgba(123,149,255,.34);background:linear-gradient(170deg,rgba(123,149,255,.10),rgba(16,23,40,.5))}
.card.warn-card h3{color:var(--warn)}
.card .yr{font-family:var(--mono);font-size:.7rem;color:var(--muted);margin-left:8px;font-weight:400}

/* ============ 演算法區塊 ============ */
.algo{display:grid;grid-template-columns:1.35fr 1fr;gap:26px;align-items:start;margin:24px 0}
.steps{margin:0;padding-left:0;list-style:none;counter-reset:s}
.steps li{
  counter-increment:s;position:relative;padding:11px 0 11px 46px;
  border-bottom:1px solid rgba(34,48,78,.6);font-size:.93rem;color:#c0cbe3;
}
.steps li:last-child{border-bottom:none}
.steps li::before{
  content:counter(s);position:absolute;left:0;top:11px;
  width:27px;height:27px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:.76rem;font-weight:600;
  background:rgba(123,149,255,.14);color:var(--accent);border:1px solid rgba(123,149,255,.3);
}
.steps b{color:#fff;margin-right:8px}
.note{
  background:rgba(43,179,163,.07);border:1px solid rgba(43,179,163,.26);
  border-radius:var(--r);padding:20px;
}
.note h4{margin:0 0 .6em;font-size:.92rem;color:var(--accent-2)}
.note p{font-size:.89rem;color:#b3c0d8;margin:0 0 .7em}
.note p:last-child{margin:0}
.note.warn{background:rgba(224,114,95,.07);border-color:rgba(224,114,95,.28)}
.note.warn h4{color:var(--warn)}
.eq{
  font-family:var(--mono);font-size:.92rem;color:#d3ddf7;
  background:rgba(8,12,22,.6);border:1px solid var(--line);border-radius:9px;
  padding:11px 15px;overflow-x:auto;text-align:center;
}
.eq.big{font-size:1.05rem;padding:18px;margin:20px auto;max-width:520px}

/* ============ 互動元件 ============ */
.demo{
  background:linear-gradient(175deg,rgba(16,23,40,.94),rgba(11,16,32,.8));
  border:1px solid var(--line);border-radius:18px;padding:26px;margin:34px 0 0;
  box-shadow:0 24px 60px -34px rgba(0,0,0,.9);
}
.demo.compact{padding:20px;margin:0}
.demo-head h3{font-size:1.04rem;margin:0 0 .4em}
.demo-head h3::before{content:"◆";color:var(--accent-2);margin-right:9px;font-size:.7em;vertical-align:.18em}
.demo-head p{font-size:.9rem;color:var(--muted);max-width:78ch;margin:0}
.controls{display:flex;flex-wrap:wrap;gap:14px 20px;align-items:flex-end;margin:20px 0 16px;padding:14px 16px;background:rgba(8,12,22,.5);border:1px solid rgba(34,48,78,.7);border-radius:11px}
.controls label{display:flex;flex-direction:column;gap:5px;font-size:.78rem;color:var(--muted);letter-spacing:.03em}
.controls output{font-family:var(--mono);color:var(--accent-2);font-size:.82rem}
.controls label{position:relative}
.controls label output{position:absolute;right:0;top:0}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:175px;height:3px;border-radius:2px;
  background:var(--line);outline:none;cursor:pointer;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:14px;height:14px;border-radius:50%;
  background:var(--accent);border:2px solid var(--bg);cursor:pointer;
  box-shadow:0 0 0 1px var(--accent);
}
input[type=range]::-moz-range-thumb{width:12px;height:12px;border-radius:50%;background:var(--accent);border:2px solid var(--bg);cursor:pointer}
select{
  background:var(--panel-2);color:var(--text);border:1px solid var(--line);
  border-radius:8px;padding:7px 11px;font-family:var(--sans);font-size:.84rem;cursor:pointer;min-width:190px;
}
select:focus,input:focus-visible,.btn:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.stat{font-family:var(--mono);font-size:.78rem;color:var(--muted);align-self:center}

canvas{display:block;width:100%}
.plot-box canvas{margin-bottom:6px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.grid-2.gap{gap:22px;margin-top:18px}
.cap{font-size:.82rem;color:var(--muted);line-height:1.65;margin:8px 0 0}
.mini-h{font-family:var(--mono);font-size:.78rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;margin:0 0 8px}

.sift-stage{margin-top:6px}
.sift-arrow{
  text-align:center;font-size:.78rem;color:var(--muted);font-family:var(--mono);
  padding:6px 0;position:relative;
}
.sift-arrow b{color:var(--warn)}
.metrics{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.metric{
  background:rgba(8,12,22,.6);border:1px solid var(--line);border-radius:9px;
  padding:9px 14px;min-width:104px;
}
.metric .k{display:block;font-size:.7rem;color:var(--muted);letter-spacing:.06em;margin-bottom:2px}
.metric .v{font-family:var(--mono);font-size:1rem;color:var(--text);font-weight:600}
.metric.ok .v{color:var(--accent-2)}
.metric.no .v{color:var(--gold)}

.imf-stack{display:flex;flex-direction:column;gap:2px;margin-top:6px}
.imf-row{
  display:grid;grid-template-columns:78px 1fr;gap:10px;align-items:center;
  border-left:3px solid var(--line);padding-left:10px;transition:background .2s;
}
.imf-row:hover{background:rgba(123,149,255,.05)}
.imf-tag{font-family:var(--mono);font-size:.76rem;line-height:1.35}
.imf-tag b{display:block;color:var(--text);font-size:.82rem}
.imf-tag span{color:var(--muted);font-size:.72rem}
.legend{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:14px;font-size:.76rem;color:var(--muted)}
.legend i{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:6px;vertical-align:.02em}

/* ============ 表格 ============ */
.table-wrap{overflow-x:auto;margin:20px 0;border:1px solid var(--line);border-radius:var(--r)}
.tbl{width:100%;border-collapse:collapse;font-size:.88rem;min-width:640px}
.tbl th{
  text-align:left;padding:12px 14px;background:rgba(123,149,255,.08);
  color:#cdd8f0;font-weight:600;font-size:.82rem;letter-spacing:.04em;
  border-bottom:1px solid var(--line);white-space:nowrap;
}
.tbl td{padding:12px 14px;border-bottom:1px solid rgba(34,48,78,.55);color:#b9c4dd;vertical-align:top}
.tbl tbody tr:last-child td{border-bottom:none}
.tbl tbody tr:hover{background:rgba(255,255,255,.02)}
.tbl.lit td:first-child{white-space:nowrap;color:#d3ddf7}
.tbl tr.hl{background:rgba(43,179,163,.07)}
.tbl tr.hl td{color:#c9d6ec}
.pill{
  display:inline-block;padding:3px 11px;border-radius:999px;font-size:.78rem;font-weight:600;
  background:rgba(255,255,255,.06);white-space:nowrap;
}
.pill[data-stage=W]{color:var(--st-W);background:rgba(224,114,95,.14)}
.pill[data-stage=N1]{color:var(--st-N1);background:rgba(216,161,47,.14)}
.pill[data-stage=N2]{color:var(--st-N2);background:rgba(43,179,163,.14)}
.pill[data-stage=N3]{color:var(--st-N3);background:rgba(139,124,240,.14)}
.pill[data-stage=R]{color:var(--st-R);background:rgba(74,163,232,.14)}
.fn{color:var(--gold)}

/* ============ 管線 ============ */
.pipeline{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:12px;padding:0;margin:26px 0}
.pipeline li{
  background:linear-gradient(170deg,rgba(20,29,49,.9),rgba(16,23,40,.5));
  border:1px solid var(--line);border-radius:12px;padding:18px 16px;position:relative;
}
.pipeline li::after{
  content:"→";position:absolute;right:-12px;top:50%;transform:translateY(-50%);
  color:var(--line);font-size:1rem;z-index:2;
}
.pipeline li:last-child::after{display:none}
.pnum{
  display:inline-flex;align-items:center;justify-content:center;
  width:25px;height:25px;border-radius:7px;margin-bottom:10px;
  background:rgba(123,149,255,.15);color:var(--accent);
  font-family:var(--mono);font-size:.78rem;font-weight:600;
}
.pipeline b{display:block;font-size:.92rem;margin-bottom:6px}
.pipeline p{font-size:.81rem;color:var(--muted);margin:0;line-height:1.6}

/* ============ 實驗室 ============ */
.lab-step{margin-top:26px;padding-top:24px;border-top:1px solid rgba(34,48,78,.6)}
.lab-step:first-child{margin-top:0;padding-top:0;border-top:none}
.lab-step h3{display:flex;align-items:center;gap:10px;font-size:1rem}
.lab-step h3 .pnum{margin-bottom:0}
.sub-p{font-size:.88rem;color:var(--muted);margin:0 0 4px}
.progress-line{height:4px;background:var(--line);border-radius:2px;overflow:hidden;margin:6px 0 14px}
.progress-line span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .15s}
.placeholder{
  border:1px dashed var(--line);border-radius:11px;padding:36px;text-align:center;
  color:var(--muted);font-size:.86rem;
}
.cm{border-collapse:collapse;width:100%;font-family:var(--mono);font-size:.8rem}
.cm th,.cm td{border:1px solid rgba(34,48,78,.8);padding:7px 4px;text-align:center}
.cm th{color:var(--muted);font-weight:500;font-size:.74rem;background:rgba(123,149,255,.06)}
.cm td{color:#cfd9ee}
.cm td.diag{color:#fff;font-weight:600}
.cm caption{caption-side:top;text-align:left;font-family:var(--sans);font-size:.8rem;color:var(--muted);padding-bottom:8px}
.bar-row{display:flex;align-items:center;gap:10px;margin-bottom:9px;font-size:.82rem}
.bar-row .nm{width:74px;color:var(--muted);flex:0 0 auto;font-size:.78rem}
.bar-row .tr{flex:1;height:8px;background:rgba(34,48,78,.7);border-radius:4px;overflow:hidden}
.bar-row .tr i{display:block;height:100%;border-radius:4px;transition:width .5s cubic-bezier(.2,.8,.3,1)}
.bar-row .vv{width:54px;text-align:right;font-family:var(--mono);font-size:.78rem;color:#d3ddf7;flex:0 0 auto}

.guess-row{display:flex;flex-wrap:wrap;gap:9px;margin:14px 0}
.guess{
  padding:8px 16px;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.03);color:var(--text);cursor:pointer;font-family:var(--sans);font-size:.85rem;
  transition:all .18s;
}
.guess:hover:not(:disabled){border-color:currentColor;transform:translateY(-1px)}
.guess:disabled{cursor:default;opacity:.5}
.guess.correct{background:rgba(43,179,163,.2);border-color:var(--accent-2);color:var(--accent-2);opacity:1}
.guess.wrong{background:rgba(224,114,95,.18);border-color:var(--warn);color:var(--warn);opacity:1}
.verdict{padding:12px 16px;border-radius:11px;font-size:.9rem;margin-top:6px}
.verdict.good{background:rgba(43,179,163,.12);border:1px solid rgba(43,179,163,.3)}
.verdict.bad{background:rgba(224,114,95,.1);border:1px solid rgba(224,114,95,.3)}
.verdict b{color:#fff}

.stage-tabs{display:flex;flex-wrap:wrap;gap:7px;margin:14px 0}
.stage-tab{
  padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:transparent;
  color:var(--muted);cursor:pointer;font-family:var(--sans);font-size:.82rem;transition:all .18s;
}
.stage-tab:hover{color:var(--text)}
.stage-tab.on{color:#0a0e18;font-weight:600;border-color:transparent}

.side{display:flex;flex-direction:column;gap:18px}

/* ============ 參考文獻 ============ */
.refs{list-style:none;counter-reset:r;padding:0;margin:22px 0 0;display:grid;gap:12px}
.refs li{
  counter-increment:r;position:relative;padding:16px 18px 16px 54px;
  background:rgba(16,23,40,.55);border:1px solid var(--line);border-radius:11px;
  font-size:.88rem;color:#b9c4dd;line-height:1.7;scroll-margin-top:80px;
}
.refs li::before{
  content:"[" counter(r) "]";position:absolute;left:14px;top:16px;
  font-family:var(--mono);font-size:.78rem;color:var(--accent);
}
.refs li:target{border-color:var(--accent);background:rgba(123,149,255,.09)}
.refs b{color:#dfe7f7;font-weight:600}
.refs i{color:#a9b6d2}
.refs a{color:var(--accent-2);text-decoration:none;border-bottom:1px solid rgba(43,179,163,.35)}
.refs a:hover{border-bottom-color:var(--accent-2)}
.rtag{
  display:inline-block;margin-left:8px;padding:1px 9px;border-radius:999px;
  background:rgba(123,149,255,.1);color:var(--muted);font-size:.74rem;
}
.colophon{margin-top:38px;padding:24px;border:1px solid var(--line);border-radius:var(--r);background:rgba(16,23,40,.45)}
.colophon h3{color:var(--accent-2)}
.colophon p{font-size:.88rem;color:#b3c0d8}
.muted{color:var(--muted)}
.closing{font-size:.98rem;color:#c3cde4;max-width:76ch}

/* ============ 頁尾 ============ */
.foot{border-top:1px solid var(--line);padding:22px 20px;background:rgba(7,10,18,.7)}
.foot .wrap{display:flex;justify-content:space-between;gap:12px;font-size:.8rem;color:var(--muted);flex-wrap:wrap}

/* ============ 響應式 ============ */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .cards-3{grid-template-columns:1fr 1fr}
  .algo{grid-template-columns:1fr}
  .pipeline{grid-template-columns:1fr 1fr}
  .pipeline li::after{display:none}
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:680px){
  :root{--nav-h:52px}
  .chapter{padding:44px 16px 64px;min-height:auto}
  .cards-3,.cards-2{grid-template-columns:1fr}
  .pipeline{grid-template-columns:1fr}
  .hero-stats{gap:22px}
  .demo{padding:18px 15px}
  .controls{padding:12px}
  input[type=range]{width:100%;min-width:150px}
  .controls label{flex:1 1 150px}
  .tabs{
    position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;gap:0;padding:8px;
    background:rgba(9,13,24,.97);backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);max-height:70vh;overflow-y:auto;
    display:none;mask-image:none;
  }
  .tabs.open{display:flex}
  .tabs a{padding:10px 14px;border-radius:8px}
  .tabs-toggle{display:block}
  html{scroll-snap-type:none}
  .scroll-cue{display:none}
}