:root{--bg:#f6f7fb;--card:#fff;--ink:#14171f;--mute:#5b6372;--line:#dfe3ec;--brand:#2f5bea;--brand-ink:#fff;--soft:#e9eefd;--ok:#16794a;--bad:#b3261e;--r:14px;--h:56px}
:root[data-theme=dark]{--bg:#0f1218;--card:#181c25;--ink:#eef0f5;--mute:#a0a8b8;--line:#2a303c;--brand:#7ea0ff;--brand-ink:#0b1020;--soft:#212a44;--ok:#5fd39b;--bad:#ff8a80}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#0f1218;--card:#181c25;--ink:#eef0f5;--mute:#a0a8b8;--line:#2a303c;--brand:#7ea0ff;--brand-ink:#0b1020;--soft:#212a44;--ok:#5fd39b;--bad:#ff8a80}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--h)}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;overflow-x:hidden}
a{color:var(--brand)}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--card);padding:12px;z-index:10}
.skip:focus{left:8px;top:8px}
header.top{height:var(--h);display:flex;align-items:center;gap:8px;padding:0 12px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:1.15rem;color:var(--ink);text-decoration:none;min-height:44px;margin-right:auto}
.brand i{width:30px;height:30px;border-radius:9px;background:var(--brand);color:var(--brand-ink);display:grid;place-items:center;font-style:normal;font-size:1rem}
.hbtn{min-width:44px;min-height:44px;display:inline-grid;place-items:center;padding:0 10px;border:1px solid var(--line);border-radius:12px;background:transparent;color:var(--ink);font:600 .9rem system-ui,sans-serif;text-decoration:none;cursor:pointer}
.wrap{max-width:1040px;margin:0 auto;padding:0 16px}
/* tool */
.tool{min-height:calc(100vh - var(--h));min-height:calc(100dvh - var(--h));padding:14px 0 20px;display:flex;flex-direction:column}
.tool>.in{width:100%;max-width:640px;margin:0 auto;display:flex;flex-direction:column;flex:1;gap:12px}
h1{font-size:1.3rem;line-height:1.25;margin:0 0 2px}
.crumb{font-size:.85rem;color:var(--mute);margin:0}
.crumb a{color:var(--mute)}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px;display:flex;flex-direction:column;gap:12px}
.panel.grow{flex:1}
.f{display:flex;flex-direction:column;gap:4px;min-width:0}
.f>label,.lbl{font-size:.85rem;font-weight:600;color:var(--mute)}
input,select,textarea,button{font:inherit;color:inherit}
input[type=text],input[type=number],input[type=date],input[type=datetime-local],input[type=time],select,textarea{width:100%;min-height:48px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--bg);font-size:16px}
textarea{resize:vertical;min-height:120px;line-height:1.45}
textarea.fill{flex:1;min-height:140px}
.row{display:flex;gap:10px}
.row>*{flex:1;min-width:0}
.btn{min-height:48px;min-width:48px;padding:0 16px;border-radius:12px;border:1px solid var(--line);background:var(--card);font-weight:600;cursor:pointer}
.btn.p{background:var(--brand);color:var(--brand-ink);border-color:var(--brand)}
.btn[aria-pressed=true],.btn.on{background:var(--soft);border-color:var(--brand);color:var(--ink)}
.btn:disabled{opacity:.5;cursor:default}
.btns{display:flex;flex-wrap:wrap;gap:8px}
.btns .btn{flex:1 1 calc(50% - 8px)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips .btn{flex:1 1 0;padding:0 10px}
.res{background:var(--soft);border-radius:var(--r);padding:14px;display:flex;flex-direction:column;gap:6px}
.res .big{font-size:1.8rem;font-weight:800;line-height:1.15;overflow-wrap:anywhere}
.res .sub{color:var(--mute);font-size:.92rem;overflow-wrap:anywhere}
.kv{display:grid;grid-template-columns:1fr auto;gap:6px 12px;margin:0}
.kv dt{color:var(--mute)}.kv dd{margin:0;font-weight:700;text-align:right}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.stat{background:var(--soft);border-radius:12px;padding:8px 12px}
.stat b{display:block;font-size:1.3rem;line-height:1.2}.stat span{font-size:.8rem;color:var(--mute)}
.chk{display:flex;align-items:center;gap:10px;min-height:44px;font-size:1rem}
.chk input{width:24px;height:24px;flex:none;accent-color:var(--brand)}
input[type=range]{width:100%;min-height:44px;accent-color:var(--brand)}
.msg{min-height:1.4em;font-size:.92rem;color:var(--mute)}.msg.bad{color:var(--bad)}.msg.ok{color:var(--ok)}
.clock{font-size:clamp(2.6rem,16vw,4.5rem);font-weight:800;text-align:center;font-variant-numeric:tabular-nums;line-height:1.1;padding:12px 0}
.laps{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:4px;font-variant-numeric:tabular-nums}
.laps li{display:flex;justify-content:space-between;padding:6px 4px;border-bottom:1px solid var(--line)}
.sw{height:84px;border-radius:12px;border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;font-size:.92rem;font-variant-numeric:tabular-nums}
th,td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:right}th:first-child,td:first-child{text-align:left}
.tw{overflow-x:auto}
details>summary{min-height:44px;display:flex;align-items:center;cursor:pointer;font-weight:600}
canvas{max-width:100%;height:auto;image-rendering:pixelated;background:#fff;border-radius:8px}
.qrbox{display:grid;place-items:center;padding:8px}
.ad{margin:18px auto;max-width:728px;min-height:90px;text-align:center}
.ad[hidden]{display:none}
.ad small{display:block;color:var(--mute);font-size:.7rem}
/* text under tool */
.seo{max-width:760px;margin:0 auto;padding:8px 0 28px}
.seo h2{font-size:1.2rem;margin:1.4em 0 .4em}.seo h3{font-size:1rem;margin:1em 0 .2em}.seo p,.seo li{color:var(--ink)}
.seo ul{padding-left:1.2em}
.related{display:flex;flex-wrap:wrap;gap:8px;padding:0;list-style:none}
.related a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border:1px solid var(--line);border-radius:999px;background:var(--card);text-decoration:none;color:var(--ink)}
footer.foot{border-top:1px solid var(--line);background:var(--card);padding:18px 0 24px;color:var(--mute);font-size:.9rem}
footer.foot nav{display:flex;flex-wrap:wrap;gap:4px 16px}
footer.foot a{display:inline-flex;align-items:center;min-height:44px;color:var(--mute)}
/* home */
.hero{padding:18px 0 6px}.hero h1{font-size:1.5rem}.hero p{margin:4px 0 0;color:var(--mute)}
.search{position:relative;margin:12px 0 10px}
.search input{padding-left:14px}
.cats{display:flex;gap:8px;overflow-x:auto;padding:2px 0 8px;scrollbar-width:none}
.cats::-webkit-scrollbar{display:none}
.cats .btn{flex:none;white-space:nowrap}
.grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.grid a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:104px;padding:10px 4px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);text-decoration:none;color:var(--ink);text-align:center;font-size:.85rem;font-weight:600;line-height:1.2}
.grid a:hover{border-color:var(--brand)}
.ic{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-weight:800;font-size:1.05rem;color:#fff;background:hsl(var(--hu) 62% 46%)}
.cat-h{font-size:1rem;margin:20px 0 8px;color:var(--mute);text-transform:uppercase;letter-spacing:.04em}
.none{padding:20px 0;color:var(--mute)}
@media (min-width:520px){.grid{grid-template-columns:repeat(4,1fr)}.stats{grid-template-columns:repeat(3,1fr)}}
@media (min-width:768px){.grid{grid-template-columns:repeat(5,1fr)}.grid a{font-size:.9rem}h1{font-size:1.5rem}.hero h1{font-size:1.9rem}}
@media (min-width:1000px){.grid{grid-template-columns:repeat(6,1fr)}}
@media (max-height:600px){.tool{padding-top:8px}.tool>.in{gap:8px}.panel{padding:10px;gap:8px}h1{font-size:1.15rem}}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
#tool{display:flex;flex-direction:column;gap:12px;flex:1}
.noscript{padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--card)}
.legal{max-width:760px;margin:0 auto;padding:18px 0 32px}.legal h1{font-size:1.5rem}.legal h2{font-size:1.1rem;margin:1.5em 0 .3em}
@media (max-height:700px){input[type=text],input[type=number],input[type=date],input[type=datetime-local],select{min-height:44px;padding:6px 12px}.btn{min-height:44px}.res{padding:10px}.res .big{font-size:1.5rem}.hero{padding-top:10px}}