:root{--font-sans: "Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;--bg: #ffffff;--text: #000000;--text-muted: #5f5f5f;--surface: #f3f3f3;--surface-hover: #e8e8e8;--caution-bg: #fff8e1;--caution-accent: #f5a623;--radius: 14px;--radius-pill: 999px}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:var(--text)}button{font-family:inherit;color:inherit;cursor:pointer;border:0;background:none}:focus-visible{outline:2px solid var(--text);outline-offset:2px}.muted{color:var(--text-muted)}.small{font-size:.85rem}.page{max-width:1080px;margin:0 auto;padding:28px 20px 24px}.top{margin-bottom:32px}.top__back{font-size:.85rem;color:var(--text-muted);text-decoration:none}.top__back:hover{color:var(--text)}.top__title{margin:14px 0 4px;font-size:clamp(2.4rem,7vw,3.6rem);font-weight:700;line-height:1.1}.top__sub{margin:0;max-width:520px;color:var(--text-muted)}.layout{display:grid;grid-template-columns:300px 1fr;gap:40px;align-items:start}.picker{position:sticky;top:24px;max-height:calc(100vh - 48px);overflow-y:auto;padding-right:4px}.label{margin:0 0 12px;font-size:.75rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted)}.stage .label:not(:first-child){margin-top:32px}.project{margin-bottom:6px}.project__head{display:flex;justify-content:space-between;align-items:center;gap:10px;width:100%;padding:11px 14px;background:var(--surface);border-radius:var(--radius);font-size:.9rem;font-weight:500;text-align:left;transition:background .15s}.project__head:hover{background:var(--surface-hover)}.project__head--active{background:var(--text);color:#fff}.project__head--active:hover{background:var(--text)}.project__count{flex-shrink:0;font-size:.8rem;opacity:.7}.levels{display:grid;grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:6px;padding:8px 2px 10px}.level{aspect-ratio:1;background:var(--surface);border-radius:10px;font-size:.85rem;font-weight:600;transition:background .15s,color .15s}.level:hover{background:var(--surface-hover)}.level--active,.level--active:hover{background:var(--text);color:#fff}.how{margin-top:24px;font-size:.85rem;color:var(--text-muted)}.how summary{cursor:pointer;font-weight:600}.how ol{margin:8px 0 0;padding-left:1.2rem}.now{margin:0 0 10px;font-weight:600}.now span{font-weight:400;color:var(--text-muted)}.empty{display:flex;flex-direction:column;align-items:center;justify-content:center;aspect-ratio:16 / 9;background:var(--surface);border-radius:var(--radius);text-align:center}.empty p{margin:0}.caution-box{display:flex;gap:12px;align-items:flex-start;margin-top:20px;padding:14px 16px;background:var(--caution-bg);border-left:4px solid var(--caution-accent);border-radius:10px;font-size:.9rem}.ads{display:flex;flex-wrap:wrap;gap:16px;margin-bottom:10px}.ad{border:0;max-width:100%}.player-wrapper{position:relative;width:100%;aspect-ratio:16 / 9;background:#000;border-radius:var(--radius) var(--radius) 0 0;overflow:hidden}.player-host,.player-host iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.video-blocker{position:absolute;top:0;right:0;bottom:0;left:0}.custom-controls{display:flex;align-items:center;gap:12px;padding:10px 14px;background:#000;color:#fff;border-radius:0 0 var(--radius) var(--radius)}.custom-controls input[type=range]{flex:1;accent-color:#fff}.time-display{font-size:.8rem;font-variant-numeric:tabular-nums;white-space:nowrap}.foot{margin-top:56px;padding-top:24px;border-top:1px solid var(--surface-hover);text-align:center}.foot p{margin:0 0 12px}@media (max-width: 820px){.layout{grid-template-columns:1fr;gap:32px}.picker{position:static;max-height:none;overflow:visible}}