:root{
  --bg:#f7f3ea; --surface:#fffdf8; --surface-2:#f2ebdc; --ink:#1d1a14; --muted:#6f6656;
  --line:#e6dece; --gold:#b07d0c; --gold-hi:#e7c25a; --gold-lo:#8a6410; --gold-soft:#f6e8c3; --bar-ink:#5a4103;
  --lcd:#1f2a1f; --lcd-ink:#b8f5a0; --shadow:0 1px 2px rgba(60,45,10,.06),0 12px 32px -12px rgba(60,45,10,.18);
  --scale-body:#2a2722; --scale-top:#d9d4ca; --alloy:#cfc6b3; --c2:#c8693a; --c3:#6b7f99; --liquid:#d9a441;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#12110e; --surface:#1b1915; --surface-2:#25221c; --ink:#f3eee3; --muted:#a69d8b;
    --line:#332f27; --gold:#e3b955; --gold-hi:#f6d888; --gold-lo:#a37f26; --gold-soft:#2e2717;
    --lcd:#0e160e; --lcd-ink:#a6f08a; --shadow:0 1px 2px rgba(0,0,0,.3),0 16px 40px -16px rgba(0,0,0,.6);
    --scale-body:#0c0b09; --scale-top:#4a463e; --alloy:#4a4438; --c2:#e08a5c; --c3:#8ea3bf; --liquid:#e6b45a; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#12110e; --surface:#1b1915; --surface-2:#25221c; --ink:#f3eee3; --muted:#a69d8b;
  --line:#332f27; --gold:#e3b955; --gold-hi:#f6d888; --gold-lo:#a37f26; --gold-soft:#2e2717;
  --lcd:#0e160e; --lcd-ink:#a6f08a; --shadow:0 1px 2px rgba(0,0,0,.3),0 16px 40px -16px rgba(0,0,0,.6);
  --scale-body:#0c0b09; --scale-top:#4a463e; --alloy:#4a4438; --c2:#e08a5c; --c3:#8ea3bf; --liquid:#e6b45a; color-scheme:dark;
}
/* silver pages */
:root[data-metal="silver"]{--gold:#7b8490;--gold-hi:#e4e8ed;--gold-lo:#555d68;--gold-soft:#eceff3;--bar-ink:#2f353d}
@media (prefers-color-scheme:dark){:root[data-metal="silver"]:not([data-theme="light"]){--gold:#b9c2cc;--gold-hi:#f0f3f6;--gold-lo:#7a838e;--gold-soft:#23272c}}
:root[data-metal="silver"][data-theme="dark"]{--gold:#b9c2cc;--gold-hi:#f0f3f6;--gold-lo:#7a838e;--gold-soft:#23272c}

*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:Manrope,system-ui,sans-serif;font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}
.wrap{max-width:1160px;margin:0 auto;padding:0 16px}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace;font-variant-numeric:tabular-nums}
a{color:inherit}
button{font:inherit;color:inherit}

/* header */
header{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;text-decoration:none;letter-spacing:-.01em}
.brand-mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,#e7c25a,#b07d0c 60%,#8a6410);display:grid;place-items:center;color:#2a1d00;font-size:13px;font-weight:800}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links a{text-decoration:none;color:var(--muted);font-weight:600;font-size:14px;padding:8px 12px;border-radius:8px}
.nav-links a:hover{color:var(--ink);background:var(--surface-2)}
.icon-btn{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--surface);display:grid;place-items:center;cursor:pointer}
.icon-btn:hover{border-color:var(--gold)}
.nav-right{display:flex;align-items:center;gap:6px}
.menu-btn{display:none}
.skip{position:absolute;inset-inline-start:16px;top:8px;z-index:20;background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:8px;font-weight:700;text-decoration:none;transform:translateY(-160%)}
.skip:focus{transform:none}
@media (max-width:720px){
  .menu-btn{display:grid}
  .nav-links{position:absolute;top:60px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 14px;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--shadow);display:none}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px;font-size:15px}
}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:2px solid var(--gold);outline-offset:2px}

/* hero */
.crumbs{font-size:13px;color:var(--muted);padding-top:20px}
.crumbs a{text-decoration:none;font-weight:600}
.crumbs a:hover{color:var(--gold)}
.hero{padding:28px 0 12px;text-align:center}
.hero.home{padding-top:44px}
.hero-flag{width:64px;height:48px;border-radius:8px;box-shadow:0 4px 14px rgba(0,0,0,.18);object-fit:cover;display:block;margin:0 auto 14px}
.hero-mono{width:56px;height:56px;border-radius:14px;margin:0 auto 14px;display:grid;place-items:center;font-weight:800;font-size:18px;color:#2a1d00;background:linear-gradient(135deg,var(--gold-hi),var(--gold) 60%,var(--gold-lo))}
.eyebrow{display:inline-flex;gap:8px;align-items:center;font-size:13px;font-weight:600;color:var(--gold-lo);background:var(--gold-soft);padding:5px 12px;border-radius:99px}
:root[data-theme="dark"] .eyebrow{color:var(--gold)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .eyebrow{color:var(--gold)}}
h1{font-weight:800;font-size:clamp(30px,5vw,50px);line-height:1.08;margin:14px 0 8px;letter-spacing:-.03em}
.lede{color:var(--muted);max-width:600px;margin:0 auto;font-size:17px}
.badges{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:14px}
.badge{font-size:12px;font-weight:700;border:1px solid var(--line);background:var(--surface);border-radius:99px;padding:4px 10px;color:var(--muted)}
.badge b{color:var(--ink)}

/* tool layout */
.tool{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:20px;margin:24px 0 20px}
@media (max-width:900px){.tool{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.panel{padding:24px;align-self:start}
@media (max-width:520px){.panel{padding:18px}}
.mode{display:flex;align-items:center;gap:10px;margin-bottom:18px}
.seg{display:inline-flex;background:var(--surface-2);border-radius:12px;padding:4px;position:relative;flex:1}
.seg button{flex:1;border:0;background:transparent;padding:9px 8px;border-radius:9px;font-weight:700;font-size:14px;cursor:pointer;color:var(--muted);position:relative;z-index:1;transition:color .2s}
.seg button[aria-pressed="true"]{color:var(--ink)}
.seg .thumb{position:absolute;top:4px;bottom:4px;left:4px;width:calc(50% - 4px);background:var(--surface);border-radius:9px;box-shadow:0 1px 3px rgba(0,0,0,.12);transition:transform .3s cubic-bezier(.3,.7,.2,1)}
.seg[data-mode="rev"] .thumb{transform:translateX(100%)}
.swap{border:1px solid var(--line);background:var(--surface);width:42px;height:42px;border-radius:12px;cursor:pointer;display:grid;place-items:center;transition:transform .35s;flex:none}
.swap:hover{border-color:var(--gold);transform:rotate(180deg)}

.field{margin-bottom:14px}
.field-label{font-size:13px;font-weight:600;color:var(--muted);display:flex;justify-content:space-between;gap:8px;margin-bottom:6px}
.input-box{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:14px;background:var(--bg);padding:4px 16px;transition:border-color .2s,box-shadow .2s;min-width:0}
.input-box:focus-within{border-color:var(--gold);box-shadow:0 0 0 4px color-mix(in srgb,var(--gold) 18%,transparent)}
.input-box input{flex:1;min-width:0;width:100%;border:0;background:transparent;font-family:"JetBrains Mono",monospace;font-size:clamp(28px,5vw,40px);font-weight:700;color:var(--ink);padding:10px 0;outline:none}
.input-box .unit{font-weight:700;color:var(--muted);font-size:18px;white-space:nowrap}
.input-box.sm{padding:0 12px}
.input-box.sm input{font-size:18px;padding:10px 0}
.input-box.sm .unit{font-size:14px}
.multi{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.multi .input-box{padding:2px 12px;flex-direction:column;align-items:flex-start}
.multi .input-box input{font-size:clamp(22px,4vw,30px);padding:6px 0 0}
.multi .input-box .unit{font-size:12px;padding-bottom:6px}
.row{display:flex;gap:8px}
.row>.input-box{flex:1}
input[type=range]{width:100%;margin:14px 0 4px;accent-color:var(--gold)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.chip{border:1px solid var(--line);background:var(--surface);border-radius:99px;padding:6px 12px;font-size:13px;font-weight:600;cursor:pointer;font-family:"JetBrains Mono",monospace}
.chip:hover{border-color:var(--gold);color:var(--gold)}
select{font:inherit;font-weight:600;font-size:14px;border:1.5px solid var(--line);border-radius:14px;background:var(--bg);color:var(--ink);padding:0 10px;min-height:46px;max-width:100%}

.result{margin-top:20px;border-radius:16px;padding:20px;background:linear-gradient(135deg,var(--gold-soft),color-mix(in srgb,var(--gold-soft) 40%,var(--surface)));border:1px solid color-mix(in srgb,var(--gold) 25%,var(--line));position:relative}
.result-label{font-size:13px;font-weight:600;color:var(--muted)}
.result-val{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.result-num{font-family:"JetBrains Mono",monospace;font-weight:700;font-size:clamp(34px,7vw,54px);letter-spacing:-.02em;line-height:1.1;color:var(--ink);word-break:break-all}
.result-unit{font-size:22px;font-weight:800;color:var(--gold)}
.result-tmr{font-family:"JetBrains Mono",monospace;font-weight:700;font-size:clamp(24px,4.6vw,36px);line-height:1.25}
.result-tmr small{font-family:Manrope,sans-serif;font-size:15px;color:var(--gold);font-weight:800;margin:0 10px 0 4px}
.formula{margin-top:6px;font-size:13px;color:var(--muted)}
.copy{position:absolute;top:14px;right:14px;border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:6px 10px;font-size:12px;font-weight:700;cursor:pointer}
.copy:hover{border-color:var(--gold)}
.minis{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:8px;margin-top:14px}
.mini{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.mini .l{font-size:12px;color:var(--muted);font-weight:600}
.mini .n{font-family:"JetBrains Mono",monospace;font-weight:700;font-size:17px;word-break:break-all}

.sub{margin-top:22px;display:grid;gap:18px}
.sub h3,.sub .h3{margin:0 0 10px;font-size:14px;font-weight:700}
.sub h3 span,.sub .h3 span{color:var(--muted);font-weight:500}
.karats{display:grid;grid-template-columns:repeat(auto-fit,minmax(70px,1fr));gap:6px}
.karat{border:1.5px solid var(--line);background:var(--surface);border-radius:10px;padding:8px 4px;cursor:pointer;text-align:center;font-weight:700;font-size:14px}
.karat small{display:block;font-weight:500;font-size:11px;color:var(--muted)}
.karat[aria-pressed="true"]{border-color:var(--gold);background:var(--gold-soft)}
.value-out{margin-top:8px;font-size:14px;color:var(--muted)}
.value-out b{color:var(--ink);font-family:"JetBrains Mono",monospace;font-size:18px}
.local{margin-top:4px;padding:14px 16px;border-radius:14px;background:var(--surface-2);font-size:14px;color:var(--muted)}
.local b{color:var(--ink)}

/* visual cards */
.vis{display:grid;gap:20px;align-content:start}
.vis-head{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:18px 22px 0}
.vis-head .h{margin:0;font-size:15px;font-weight:700}
.vis-head span{font-size:12px;color:var(--muted);font-weight:600;text-align:right}
.vis-body{padding:16px 22px 22px}
.scale-svg{display:block;width:100%;height:auto}
.bar-g{transition:transform .5s cubic-bezier(.3,1.4,.5,1),opacity .35s}
.bar-g.off{opacity:0;transform:translateY(-40px)}
.platform{transition:transform .5s cubic-bezier(.3,1.4,.5,1)}
.legend{padding:0 22px 18px;font-size:13px;color:var(--muted);display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.legend b{color:var(--ink)}

.trad{display:grid;grid-template-columns:180px 1fr;gap:18px;align-items:center;padding:16px 22px 22px}
@media (max-width:440px){.trad{grid-template-columns:1fr;justify-items:center}}
.ring-svg{width:180px;height:180px}
.seg-arc{fill:none;stroke-width:14;stroke:var(--surface-2);transition:stroke .3s,opacity .3s}
.seg-arc.on{stroke:var(--gold)}
.seg-arc.inner.on{stroke:var(--gold-hi)}
.trad-list{display:grid;gap:10px;width:100%}
.trad-item{display:flex;justify-content:space-between;align-items:baseline;border-bottom:1px dashed var(--line);padding-bottom:8px}
.trad-item span{color:var(--muted);font-size:14px}
.trad-item b{font-family:"JetBrains Mono",monospace;font-size:20px}
.dot{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:0}

.pbar{display:flex;height:34px;border-radius:10px;overflow:hidden;background:var(--surface-2)}
.pbar div{transition:width .5s cubic-bezier(.3,.7,.2,1);display:flex;align-items:center;padding:0 10px;font-size:12px;font-weight:700;white-space:nowrap;overflow:hidden;min-width:0}
.pbar .pure{background:linear-gradient(90deg,var(--gold-lo),var(--gold),var(--gold-hi));color:#1d1500}
.pbar .alloy{background:var(--alloy);color:var(--ink);justify-content:flex-end}
.pbar .c2{background:var(--c2);color:#fff}
.pbar .c3{background:var(--c3);color:#fff}
.pmeta{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:8px;font-size:13px;color:var(--muted)}
.pmeta b{color:var(--ink);font-family:"JetBrains Mono",monospace}
.blist{display:grid;gap:8px;margin-top:14px}
.blist div{display:flex;justify-content:space-between;gap:10px;font-size:14px;color:var(--muted);border-bottom:1px dashed var(--line);padding-bottom:6px}
.blist b{color:var(--ink);font-family:"JetBrains Mono",monospace}
.blist .tot{border:0;font-size:16px;color:var(--ink);font-weight:700}

/* tiles */
.tiles{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:6px}
.tile{position:relative;overflow:hidden;background:var(--surface-2);border:1px solid var(--line);border-radius:6px;aspect-ratio:2/1.1;transition:opacity .3s}
.tiles.coin .tile{border-radius:50%;aspect-ratio:1}
.tiles.vial .tile{aspect-ratio:1/1.9;border-radius:5px 5px 9px 9px}
.tile.empty{opacity:.35}
.tile .fill{position:absolute;left:0;right:0;bottom:0;height:0;background:linear-gradient(180deg,var(--gold-hi),var(--gold) 55%,var(--gold-lo));transition:height .5s cubic-bezier(.3,.7,.2,1)}
.tiles.vial .tile .fill{background:linear-gradient(180deg,color-mix(in srgb,var(--liquid) 70%,#fff),var(--liquid))}
.tiles-big{display:flex;align-items:baseline;gap:8px;margin-bottom:12px}
.tiles-big b{font-family:"JetBrains Mono",monospace;font-size:26px}
.tiles-big span{color:var(--muted);font-weight:600;font-size:14px}

/* chain */
.chain{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;gap:6px}
.node{background:var(--surface-2);border-radius:14px;padding:12px 8px;text-align:center;min-width:0}
.node b{display:block;font-family:"JetBrains Mono",monospace;font-size:clamp(14px,2.2vw,18px);word-break:break-all}
.node span{font-size:12px;color:var(--muted);font-weight:600}
.node.on{background:var(--gold-soft);box-shadow:inset 0 0 0 1.5px var(--gold)}
.arrow{width:28px;height:4px;border-radius:2px;background:var(--line);position:relative;overflow:hidden}
.arrow i{position:absolute;top:0;left:-40%;width:40%;height:100%;background:var(--gold);border-radius:2px}
.arrow.go i{animation:flow .6s ease-out}
@keyframes flow{to{left:100%}}
.chain2{margin-top:10px;display:flex;justify-content:center;gap:8px;font-size:13px;color:var(--muted)}

/* karat grid */
.kwrap{display:grid;grid-template-columns:1fr 128px;gap:18px;align-items:center}
@media (max-width:440px){.kwrap{grid-template-columns:1fr}}
.kgrid{display:grid;grid-template-columns:repeat(6,1fr);gap:5px}
.kcell{aspect-ratio:1;border-radius:6px;background:var(--surface-2);position:relative;overflow:hidden;font-size:10px;font-weight:700;color:var(--muted);display:grid;place-items:center}
.kcell .fill{position:absolute;inset:0;width:0;background:linear-gradient(135deg,var(--gold-hi),var(--gold) 60%,var(--gold-lo));transition:width .4s}
.kcell span{position:relative}
.stamp{width:128px;height:128px;justify-self:center}

/* bottle */
.liq-wrap{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:center}
@media (max-width:440px){.liq-wrap{grid-template-columns:1fr;justify-items:center}}
.liquid{transform-box:fill-box;transform-origin:bottom;transition:transform .6s cubic-bezier(.3,.7,.2,1)}

/* sections */
section{margin:48px 0}
.sec-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:16px;flex-wrap:wrap}
h2.sec{font-size:clamp(22px,3.2vw,30px);margin:0;letter-spacing:-.02em;font-weight:800}
.sec-head p{margin:0;color:var(--muted);font-size:14px}
.units{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.u{padding:16px;border-radius:16px;background:var(--surface);border:1px solid var(--line);position:relative;overflow:hidden}
.u .n{font-family:"JetBrains Mono",monospace;font-weight:700;font-size:19px;word-break:break-all}
.u .l{font-size:13px;color:var(--muted);font-weight:600}
.u .meter{position:absolute;left:0;bottom:0;height:3px;background:var(--gold);transition:width .5s}

.tbl-wrap{overflow-x:auto;border-radius:16px;border:1px solid var(--line);background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{padding:12px 16px;text-align:right;white-space:nowrap}
th:first-child,td:first-child{text-align:left}
thead th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--surface-2);font-weight:700}
tbody tr{border-top:1px solid var(--line);transition:background .2s}
tbody tr[data-v]{cursor:pointer}
tbody tr[data-v]:hover{background:var(--surface-2)}
tbody tr.hit{background:var(--gold-soft)}
tbody tr.hit td:first-child{box-shadow:inset 3px 0 var(--gold)}
td{font-family:"JetBrains Mono",monospace}

/* tool directory */
.tgroup{margin-bottom:28px}
.tgroup h3,.tgroup .h3{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 12px}
.tcards{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.tcard{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:14px;background:var(--surface);border:1px solid var(--line);text-decoration:none;transition:border-color .2s,transform .2s}
.tcard:hover{border-color:var(--gold);transform:translateY(-2px)}
.tcard img{width:32px;height:24px;border-radius:4px;object-fit:cover;flex:none;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.tcard .mono-ic{width:32px;height:32px;border-radius:9px;flex:none;display:grid;place-items:center;font-size:11px;font-weight:800;color:#1d1500;background:linear-gradient(135deg,#e7c25a,#b07d0c 60%,#8a6410)}
.tcard .mono-ic.silver{background:linear-gradient(135deg,#eef1f4,#9aa3ad 60%,#646c76)}
.tcard b{font-size:14px;display:block;line-height:1.3}
.tcard small{color:var(--muted);font-size:12px}
.tcard.cur{border-color:var(--gold);background:var(--gold-soft)}

/* guide: formula · how to · difference */
.guide{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:820px){.guide{grid-template-columns:1fr}}
.guide-card{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:22px;min-width:0}
.guide-card.wide{grid-column:1/-1}
.guide-card h2.sec{font-size:clamp(20px,2.6vw,24px)}
.guide-card>p{color:var(--muted);margin:10px 0 16px;max-width:820px}
.guide-card>p b{color:var(--ink)}
.formula{display:grid;gap:8px}
.formula code{display:block;font-family:"JetBrains Mono",monospace;font-weight:700;font-size:15px;padding:12px 14px;border-radius:12px;background:var(--gold-soft);color:var(--ink);border:1px solid var(--line);overflow-wrap:anywhere}
.formula code:first-child{border-color:var(--gold)}
.guide .steps{grid-template-columns:1fr;gap:8px}
.guide .steps li{display:flex;gap:12px;align-items:center;padding:12px 14px;border-radius:12px;background:var(--surface-2)}
.guide .steps li::before{margin:0;flex:none;width:26px;height:26px;font-size:13px}
.guide .steps p b{color:var(--ink)}
.guide table{font-size:14px}
.guide th,.guide td{white-space:normal;text-align:start;vertical-align:top}
.guide tbody th{font-weight:700;color:var(--ink)}
.guide td{font-family:inherit;color:var(--muted)}
.guide td:first-of-type{font-family:"JetBrains Mono",monospace}
.guide tbody tr:first-child td{font-family:"JetBrains Mono",monospace;color:var(--ink)}
details p b{color:var(--ink)}
.guide-card h3,.guide-card .h3{font-size:18px;font-weight:700;color:var(--ink);margin:26px 0 0;letter-spacing:-.01em}
.guide-card>.tbl-wrap,.guide-card>.formula{margin-bottom:4px}
.guide.deep #formula .formula{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.guide.deep .steps{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.guide-card .plain{margin:0;padding-inline-start:20px;color:var(--muted);display:grid;gap:8px;max-width:820px}
.guide-card .plain b{color:var(--ink)}

.faq{display:grid;gap:10px}
details{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:4px 18px}
summary{cursor:pointer;font-weight:700;padding:12px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--gold);font-size:20px;line-height:1}
details[open] summary::after{content:"–"}
details p{margin:0 0 14px;color:var(--muted)}
.prose{color:var(--muted);max-width:760px}
.prose b{color:var(--ink)}
footer{border-top:1px solid var(--line);padding:32px 0 40px;color:var(--muted);font-size:13px}
.foot{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media (max-width:640px){.foot{grid-template-columns:1fr}}
.foot .h{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin:0 0 10px;color:var(--muted)}
.foot ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 16px}
.foot a{text-decoration:none;font-weight:600;color:var(--ink)}
.foot a:hover{color:var(--gold)}
.langs a{font-weight:500;color:var(--muted)}
.langs a[aria-current="true"]{color:var(--gold);font-weight:700}
.foot-note{grid-column:1/-1;border-top:1px solid var(--line);padding-top:16px}

/* content pages */
.page{max-width:780px;margin:0 auto 64px}
.page .hero{text-align:start;padding-bottom:4px}
.page h2{font-size:22px;margin:32px 0 8px;letter-spacing:-.01em}
.page h3{font-size:17px;margin:20px 0 6px}
.page p,.page li{color:var(--muted)}
.page p b,.page li b{color:var(--ink)}
.page a{color:var(--gold);font-weight:600}
.updated{font-size:13px;color:var(--muted)}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;padding:0;margin:0;list-style:none;counter-reset:s}
.steps li{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;counter-increment:s}
.steps li::before{content:counter(s);display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--gold-soft);color:var(--gold);font-weight:800;margin-bottom:10px}
.steps h3{margin:0 0 4px;font-size:16px}
.steps p{margin:0;color:var(--muted);font-size:14px}
.sitemap-list{columns:2 240px;padding-left:18px}
.sitemap-list li{margin:4px 0}
.form{display:grid;gap:14px;margin-top:20px}
.form label{display:grid;gap:6px;font-size:13px;font-weight:600;color:var(--muted)}
.form input,.form textarea{font:inherit;font-size:16px;color:var(--ink);background:var(--bg);border:1.5px solid var(--line);border-radius:12px;padding:12px 14px}
.form input:focus,.form textarea:focus{border-color:var(--gold);outline:none;box-shadow:0 0 0 4px color-mix(in srgb,var(--gold) 18%,transparent)}
.form textarea{min-height:150px;resize:vertical}
.btn{justify-self:start;border:0;border-radius:12px;padding:12px 20px;font-weight:700;cursor:pointer;color:#1d1500;background:linear-gradient(135deg,var(--gold-hi),var(--gold))}
.btn:disabled{opacity:.6;cursor:progress}
.form-status{min-height:22px;font-size:14px;font-weight:600}
.form-status[data-state="sending"]{color:var(--muted)}
.form-status[data-state="success"]{color:#2f8a4c}
.form-status[data-state="error"]{color:#c0392b}
.big404{font-size:clamp(72px,14vw,140px);font-weight:800;line-height:1;margin:24px 0 0;background:linear-gradient(135deg,var(--gold-hi),var(--gold-lo));-webkit-background-clip:text;background-clip:text;color:transparent}

/* RTL */
[dir="rtl"] .seg .thumb{left:auto;right:4px}
[dir="rtl"] .seg[data-mode="rev"] .thumb{transform:translateX(-100%)}
[dir="rtl"] .copy{right:auto;left:14px}
[dir="rtl"] th,[dir="rtl"] td{text-align:left}
[dir="rtl"] th:first-child,[dir="rtl"] td:first-child{text-align:right}
[dir="rtl"] tbody tr.hit td:first-child{box-shadow:inset -3px 0 var(--gold)}
[dir="rtl"] .pbar .alloy{justify-content:flex-start}
[dir="rtl"] .input-box input,[dir="rtl"] .chip,[dir="rtl"] .result-num{direction:ltr;text-align:right}
.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px;font-size:14px;font-weight:600;opacity:0;transition:.25s;pointer-events:none;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translate(-50%,0)}