:root{--bg:#f6f6f4;--surface:#fff;--surface-2:#f0f0ed;--fg:#1d1d1f;--muted:#66666c;--border:#deded9;--accent:#1d4ed8;--accent-hover:#1e40af;--accent-soft:#eef3ff;--accent-fg:#fff;--a:#16a34a;--b:#dc2626;--warn:#b45309;--radius:10px;--shadow:0 1px 2px #0000000d, 0 2px 8px #0000000a;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--bg:#111113;--surface:#1b1b1e;--surface-2:#26262a;--fg:#ececef;--muted:#9d9da6;--border:#323237;--accent:#5b8cff;--accent-hover:#7aa2ff;--accent-soft:#1b2440;--accent-fg:#0b1020;--warn:#f59e0b}}*,:before,:after{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--fg);margin:0;font:16px/1.75 system-ui,-apple-system,Segoe UI,Hiragino Sans,Yu Gothic UI,Meiryo,sans-serif}a{color:var(--accent)}img,video,iframe{max-width:100%}.container{width:min(1040px,100% - 32px);margin-inline:auto}.site-header{background:var(--surface);border-bottom:1px solid var(--border)}.site-header .container{flex-wrap:wrap;align-items:center;gap:4px 16px;min-height:56px;display:flex}.logo{color:var(--fg);font-size:1.1rem;font-weight:800;text-decoration:none}.site-nav{flex-wrap:wrap;gap:4px 18px;margin-left:auto;font-size:.92rem;display:flex}.site-nav a{color:var(--fg);text-decoration:none}.site-nav a:hover,.site-nav a[aria-current=page]{color:var(--accent)}main{padding-block:24px 48px}.site-footer{border-top:1px solid var(--border);background:var(--surface);color:var(--muted);padding-block:24px;font-size:.88rem}.site-footer nav{flex-wrap:wrap;gap:4px 18px;display:flex}.site-footer a{color:var(--muted)}h1{margin:0 0 8px;font-size:clamp(1.5rem,1.2rem + 1.4vw,2rem);line-height:1.3}h2{margin:40px 0 12px;font-size:1.3rem;line-height:1.4}h3{margin:24px 0 8px;font-size:1.05rem}.lead{color:var(--muted);margin:0 0 20px}.muted{color:var(--muted);font-size:.9rem}.notice{color:var(--warn);font-size:.92rem}.prose{max-width:780px}.steps{padding-left:1.4em}.steps li{margin:6px 0}.faq details{border-bottom:1px solid var(--border);padding:10px 0}.faq summary{cursor:pointer;font-weight:600}.faq details p{color:var(--muted);margin:8px 0 0}kbd{border:1px solid var(--border);background:var(--surface-2);border-bottom-width:2px;border-radius:4px;padding:1px 5px;font:.8rem ui-monospace,SFMono-Regular,Consolas,monospace}.list-plain{margin:0;padding:0;list-style:none}.sr-only{white-space:nowrap;clip-path:inset(50%);border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.btn{font:inherit;border:1px solid var(--border);background:var(--surface-2);color:var(--fg);cursor:pointer;white-space:nowrap;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:8px 14px;font-size:.92rem;line-height:1.2;text-decoration:none;display:inline-flex}.btn:hover{filter:brightness(.96)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-fg);font-weight:700}.btn-primary:hover{background:var(--accent-hover);filter:none}.btn-sm{padding:5px 9px;font-size:.84rem}input[type=text],input[type=url],select{min-width:0;font:inherit;border:1px solid var(--border);background:var(--surface);color:var(--fg);border-radius:8px;padding:7px 10px;font-size:.95rem}.input-row{flex-wrap:wrap;gap:8px;display:flex}.input-row input{flex:1;min-width:12em}.list-bar{margin-bottom:8px}.list-bar select{flex:1;min-width:10em}.btn-fine{opacity:.85;padding:5px 7px;font-size:.78rem}.badge{border:1px solid var(--border);background:var(--surface-2);color:var(--muted);vertical-align:middle;border-radius:999px;margin-left:6px;padding:1px 8px;font-size:.72rem;font-weight:600;display:inline-block}.tool-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;display:grid}.tool-card{color:inherit;text-decoration:none;display:block}a.tool-card:hover{border-color:var(--accent)}.tool-card h3{margin:0 0 4px}.tool-card p{color:var(--muted);margin:0;font-size:.9rem}.tool-card.is-soon{opacity:.6}.ad-slot{margin-block:32px}.ad-label{color:var(--muted);margin:0 0 4px;font-size:.75rem}.ad-placeholder{border:2px dashed var(--border);border-radius:var(--radius);min-height:100px;color:var(--muted);place-items:center;font-size:.85rem;display:grid}.player-frame{aspect-ratio:16/9;border-radius:var(--radius);background:#000;margin-top:12px;position:relative;overflow:hidden}.player-frame>*{border:0;width:100%;height:100%;position:absolute;inset:0}.player-frame.is-mirrored>iframe,.player-frame.is-mirrored>video,.player-frame.is-mirrored>.yt-layer>iframe{transform:scaleX(-1)}.player-frame>.yt-layer>iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.player-frame>.yt-layer{z-index:1}.player-frame>.yt-layer.is-back{z-index:0}.player-frame.is-audio{aspect-ratio:auto;background:0 0;height:64px}.player-placeholder{color:#aaa;text-align:center;place-items:center;padding:16px;font-size:.95rem;display:grid}.player-overlay{z-index:1;color:#eee;text-align:center;background:#111;place-content:center;gap:12px;padding:16px;display:grid}.player-overlay p{margin:0}.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);text-align:center;cursor:pointer;place-items:center;gap:4px;padding:32px 16px;display:grid}.drop-zone.is-over{border-color:var(--accent);background:var(--accent-soft)}.ab-panel{gap:14px;margin-top:14px;display:grid}.ab-time{font-variant-numeric:tabular-nums;justify-content:space-between;font-weight:600;display:flex}.ab-bar{background:var(--surface-2);border:1px solid var(--border);cursor:pointer;border-radius:6px;height:12px;margin-top:4px;position:relative}.ab-bar-range{background:color-mix(in srgb, var(--accent) 45%, transparent);border-radius:6px;position:absolute;top:0;bottom:0}.ab-bar-head{background:var(--fg);border-radius:2px;width:3px;height:18px;margin-left:-1px;position:absolute;top:-4px}.ab-points{grid-template-columns:1fr 1fr;gap:12px;display:grid}@media (width<=700px){.ab-points{grid-template-columns:1fr}}.ab-point{flex-wrap:wrap;align-items:center;gap:6px;display:flex}.ab-point input{font-variant-numeric:tabular-nums;width:7.5em}.ab-set{color:#fff;border:0;min-width:84px;font-weight:800}.ab-set-a{background:var(--a)}.ab-set-b{background:var(--b)}.ab-main{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.ab-play{min-width:132px;font-size:1rem;font-weight:700}.ab-toggle{min-width:140px;font-weight:700}.ab-toggle[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}.ab-settings{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;display:grid}.ab-settings label{color:var(--muted);gap:2px;font-size:.82rem;display:grid}.ab-checks{flex-wrap:wrap;gap:8px 20px;font-size:.92rem;display:flex}.ab-checks label{cursor:pointer;align-items:center;gap:6px;display:flex}.ab-status{min-height:1.5em;color:var(--warn);margin:0;font-size:.9rem}.kbd-help{color:var(--muted);margin:0;font-size:.84rem}.save-section{border-top:1px solid var(--border);gap:8px;margin-top:16px;padding-top:16px;display:grid}.section-list{flex-wrap:wrap;gap:6px;display:flex}.save-list{color:var(--muted);white-space:nowrap;align-items:center;gap:6px;font-size:.85rem;display:flex}.save-list select{max-width:14em}.mylist-layout{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);align-items:start;gap:20px;display:grid}.mylist-player{gap:12px;display:grid;position:sticky;top:12px}.mylist-player .player-frame{margin-top:0}@media (width<=860px){.mylist-layout{grid-template-columns:1fr}.mylist-player{position:static}}.playlist{gap:8px;display:grid}.list-group{margin-top:20px}.list-group-title{margin:0 0 4px;font-size:1.05rem}.list-group p{margin:0 0 10px}.playlist-item{grid-template-columns:minmax(0,1fr) auto;gap:8px;padding:10px 12px;display:grid}.playlist-item.is-current{border-color:var(--accent);background:var(--accent-soft)}.playlist-title{overflow-wrap:anywhere;font-weight:600}.playlist-meta{color:var(--muted);flex-wrap:wrap;gap:2px 10px;font-size:.8rem;display:flex}.playlist-repeat{align-items:center;gap:4px;display:inline-flex}.playlist-repeat select{padding:2px 4px;font-size:.8rem}.playlist-actions{flex-wrap:wrap;justify-content:flex-end;align-items:flex-start;gap:4px;display:flex}.now-playing{overflow-wrap:anywhere;margin:0;font-weight:600}.bookmarklet-link{cursor:grab;padding:10px 20px;font-size:1.05rem}