.yt-page{padding-bottom:24px}.home-yt .chapter-head a{display:inline-flex;align-items:center;min-height:44px}.yt-head{padding:32px 0 8px}.yt-h1{font-size:clamp(32px,4vw,48px);margin:12px 0 16px}.yt-answer{font-size:17px;line-height:1.85;padding:20px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--line);margin:8px 0 24px}.yt-intro{color:var(--ink-2);margin-bottom:8px}.yt-keys{margin:16px 0 0;padding-left:1.2em;color:var(--ink-2);font-size:16px}.yt-keys li+li{margin-top:4px}.yt-nav{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0 0;padding:0;list-style:none}.yt-nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 18px;border-radius:var(--pill);box-shadow:inset 0 0 0 1px var(--line-strong);font-size:15px;font-weight:500}.yt-nav a:hover{text-decoration:none;background:#1111110d}.yt-sec{padding:48px 0 8px;border-top:1px solid var(--line);margin-top:40px;scroll-margin-top:80px}.yt-sec>h2{font-size:24px;margin-bottom:12px}.yt-sec>p{color:var(--ink-2)}.yt-sec-links{list-style:none;margin:24px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px 24px}.yt-sec-links a{display:inline-flex;align-items:center;min-height:44px;font-weight:500}.yt-sec-links a:after{content:" →";white-space:pre}.yt-sec-links-h{font-size:14px;color:var(--ink-3);margin-top:24px}@media(max-width:720px){.yt-sec{padding-top:36px;margin-top:28px}.yt-sec>h2{font-size:20px}}.yt-callout{margin:20px 0 0;padding:16px 20px;background:var(--surface);border-left:3px solid var(--ink);border-radius:0 var(--radius-img) var(--radius-img) 0}.yt-callout-h{font-weight:700;margin-bottom:6px}.yt-callout p+p{margin-top:8px}.yt-lite{position:relative;aspect-ratio:16 / 9;background:#000;border-radius:var(--radius-img);overflow:hidden}.yt-lite img{width:100%;height:100%;object-fit:cover}.yt-lite iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.yt-play{position:absolute;inset:0;width:100%;height:100%;padding:0;border:0;background:none;cursor:pointer;display:block}.yt-play-icon{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);transition:transform .2s ease}.yt-play:hover .yt-play-icon{transform:translate(-50%,-50%) scale(1.06)}.yt-dur{position:absolute;right:8px;bottom:8px;background:#000000c7;color:#fff;font-size:13px;font-weight:600;line-height:1;padding:5px 7px;border-radius:4px}@media(prefers-reduced-motion:reduce){.yt-play-icon{transition:none}}.ch-list{list-style:none;margin:28px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 28px}@media(min-width:1100px){.ch-list.three{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:720px){.ch-list{grid-template-columns:1fr;gap:36px}}.ch{position:relative;display:flex;flex-direction:column;gap:14px;min-width:0}.ch .yt-lite,.ch .ch-actions a,.ch .ch-links a{position:relative;z-index:2}.ch-name{font-size:19px;line-height:1.45}.ch.is-link .ch-name a:after{content:"";position:absolute;inset:0;z-index:1}.ch.is-link:hover .ch-name a{text-decoration:underline;text-underline-offset:3px}.ch-body{display:flex;flex-direction:column;gap:10px;flex:1}.ch-stat{display:flex;flex-wrap:wrap;gap:6px}.ch-lead{font-size:16px;color:var(--ink-2)}.ch-tags{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}.ch-tags li{font-size:13px;font-weight:500;line-height:1.4;padding:4px 10px;border-radius:var(--pill);box-shadow:inset 0 0 0 1px var(--line-strong);color:var(--ink-2)}.ch-more{font-size:15px;font-weight:600}.ch-more:after{content:" →";white-space:pre}.ch-actions{margin-top:auto;padding-top:4px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}.btn-sm{min-height:44px;padding:0 20px;font-size:15px}.ch-links{font-size:15px;display:flex;flex-direction:column;align-items:flex-start;gap:0}.ch-links a{display:inline-flex;align-items:center;min-height:44px;text-decoration:underline;text-underline-offset:3px}.yt-themes{list-style:none;margin:8px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 24px}@media(max-width:720px){.yt-themes{grid-template-columns:1fr;gap:32px}}.yt-theme{position:relative;display:flex;flex-direction:column;gap:10px}.yt-theme .face{aspect-ratio:16 / 9}.yt-theme .face svg.sil{width:46%}.yt-theme-name{font-size:22px;margin-top:6px}.yt-theme-name a:after{content:"";position:absolute;inset:0}.yt-theme:hover .yt-theme-name a{text-decoration:underline;text-underline-offset:3px}.yt-theme-lead{color:var(--ink-2)}.yt-theme-sub{font-size:14px;color:var(--ink-3)}.yt-theme-go{font-weight:600}.yt-theme-go:after{content:" →";white-space:pre}.yt-cta{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:24px;align-items:center;padding:20px;background:var(--surface);border-radius:var(--radius-img);margin-top:32px}.yt-cta .face{aspect-ratio:16 / 9;background:#fff}.yt-cta .face svg.sil{width:50%}.yt-cta-h{font-size:13px;color:var(--ink-3);letter-spacing:.08em;font-weight:500}.yt-cta-t{font-size:18px;font-weight:700;margin-top:4px}.yt-cta-t a{display:inline-flex;align-items:center;min-height:44px}.yt-cta-lead{color:var(--ink-2)}@media(max-width:720px){.yt-cta{grid-template-columns:1fr;gap:12px;padding:16px}}.ytc-head{padding:32px 0 8px}.ytc-meta{font-size:15px;color:var(--ink-2);margin-top:8px}.ytc-lead{font-size:18px;line-height:1.85;margin-top:20px}.ytc-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:20px}.ytc-sec{padding:40px 0 0;margin-top:40px;border-top:1px solid var(--line)}.ytc-sec>h2{font-size:22px;margin-bottom:10px}.ytc-note{font-size:14px;color:var(--ink-2)}.ytc-stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0 32px;margin:16px 0 0;border-top:1px solid var(--ink)}.ytc-stats>div{padding:14px 0;border-bottom:1px solid var(--line)}.ytc-stats dt{font-size:14px;color:var(--ink-3)}.ytc-stats dd{margin:2px 0 0;font-size:22px;font-weight:700;line-height:1.35}.ytc-stats dd.ytc-stat-s{font-size:14px;font-weight:400;color:var(--ink-2);margin-top:4px}.ytc-themes{list-style:none;margin:16px 0 0;padding:0}.ytc-themes li{padding:16px 0;border-top:1px solid var(--line)}.ytc-theme-h{font-weight:600}.ytc-theme-q{margin-top:8px;color:var(--ink-2)}.ytc-theme-ql{font-size:14px;color:var(--ink-3)}.ytc-theme-go a{display:inline-flex;align-items:center;min-height:44px;font-weight:500;text-decoration:underline;text-underline-offset:3px}.ytc-back-of{font-size:14px;color:var(--ink-3)}.ytv-list{list-style:none;margin:20px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 20px}@media(max-width:1024px){.ytv-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:560px){.ytv-list{grid-template-columns:1fr}}.ytv-body{margin-top:10px}.ytv-title{font-size:16px;font-weight:600;line-height:1.55;overflow-wrap:anywhere}.ytv-meta{font-size:14px;color:var(--ink-2);margin-top:4px;display:flex;flex-wrap:wrap;gap:0 12px}.ytp-list{list-style:none;margin:20px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}@media(max-width:1024px){.ytp-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:560px){.ytp-list{grid-template-columns:1fr}}.ytp{position:relative;display:grid;grid-template-columns:128px minmax(0,1fr);gap:12px;align-items:start}.ytp-ph{display:block;aspect-ratio:16 / 9;border-radius:6px;overflow:hidden;background:var(--surface)}.ytp-ph img{width:100%;height:100%;object-fit:cover}.ytp-title{font-size:16px;font-weight:600;line-height:1.5;overflow-wrap:anywhere}.ytp-title a{text-decoration:underline;text-underline-offset:3px}.ytp-title a:after{content:"";position:absolute;inset:0}.ytp-n{font-size:14px;color:var(--ink-2)}.ytm{list-style:none;margin:20px 0 0;padding:0;display:grid;grid-template-columns:repeat(var(--count),minmax(0,1fr));gap:6px;align-items:end;height:200px;border-bottom:1px solid var(--ink)}.ytm-i{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%;min-width:0;position:relative}.ytm-n{font-size:13px;color:var(--ink-2);white-space:nowrap}.ytm-bar{width:100%;max-width:36px;height:calc(var(--v) * 140px);min-height:2px;background:var(--ink);border-radius:3px 3px 0 0;margin-top:4px}.ytm-i.is-partial .ytm-bar{background:var(--ink-3)}.ytm-m{position:absolute;top:100%;font-size:13px;color:var(--ink-3);line-height:1.3;text-align:center;padding-top:6px;white-space:nowrap}.ytm-wrap{padding-bottom:44px}@media(max-width:720px){.ytm{gap:3px}.ytm-n{font-size:13px;writing-mode:vertical-rl}.ytm-m{font-size:13px}.ytm-y{display:none}.ytm-wrap{padding-bottom:40px}}.ytc-links{list-style:none;margin:16px 0 0;padding:0;border-top:1px solid var(--line)}.ytc-links a{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;padding:8px 0;border-bottom:1px solid var(--line);font-weight:500}.ytc-links a:after{content:"→"}.yto-list{list-style:none;margin:20px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}@media(max-width:720px){.yto-list{grid-template-columns:1fr}}.yto{position:relative;display:grid;grid-template-columns:160px minmax(0,1fr);gap:14px;align-items:start}.yto-ph{display:block;aspect-ratio:16 / 9;border-radius:6px;overflow:hidden;background:var(--surface)}.yto-ph img{width:100%;height:100%;object-fit:cover}.yto-name{font-size:17px;line-height:1.45}.yto-name a:after{content:"";position:absolute;inset:0}.yto:hover .yto-name a{text-decoration:underline;text-underline-offset:3px}.yto-subs{font-size:14px;color:var(--ink-3);margin-top:2px}.yto-lead{font-size:15px;color:var(--ink-2);margin-top:4px}@media(max-width:420px){.yto{grid-template-columns:120px minmax(0,1fr)}.ytp{grid-template-columns:112px minmax(0,1fr)}}.ytc-more{margin-top:40px}.ytc-src{margin-top:32px;padding-top:16px;border-top:1px solid var(--line);font-size:14px;color:var(--ink-2)}.ytc-src p+p{margin-top:6px}.yt-rules{margin-top:48px;padding-top:32px;border-top:1px solid var(--line)}.yt-rules h2{font-size:22px;margin-bottom:12px}.yt-rules ul{padding-left:1.2em;margin:0 0 16px}.yt-rules li+li{margin-top:6px}.yt-rules p{color:var(--ink-2)}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.nowrap{white-space:nowrap}
