:root{color-scheme:dark;--bg: #0d1422;--panel: #141f31;--panel-strong: #19263a;--line: #314055;--text: #edf3fb;--muted: #a8b3c4;--soft: #d2dae6;--teal: #2dd4bf;--amber: #f8b84e;--rose: #fb7185;--blue: #60a5fa;--shadow: 0 20px 60px rgba(0, 0, 0, .28);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;min-width:320px;color:var(--text);background:linear-gradient(180deg,rgba(29,78,216,.12),transparent 380px),radial-gradient(circle at 14% 0%,rgba(45,212,191,.16),transparent 320px),var(--bg)}a{color:inherit;text-decoration:none}img,iframe{display:block;max-width:100%}.site-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;width:min(1180px,calc(100% - 32px));margin:0 auto;padding:18px 0;backdrop-filter:blur(14px)}.brand,.site-header nav{display:flex;align-items:center;gap:12px}.brand{font-size:1.12rem;font-weight:800;letter-spacing:0}.brand-mark{display:grid;width:40px;height:40px;place-items:center;border-radius:8px;background:linear-gradient(135deg,var(--teal),var(--amber));color:#07111e;font-size:.82rem;box-shadow:0 10px 30px #2dd4bf2e}.site-header nav a{color:var(--soft);font-weight:650;padding:10px 12px;border-radius:8px}.site-header nav a:hover,.site-header nav a:focus-visible{background:#ffffff14;outline:none}main{width:min(1180px,calc(100% - 32px));margin:0 auto}.section{padding:42px 0}.eyebrow{margin:0 0 10px;color:var(--amber);font-size:.82rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}h1,h2,h3,p{margin-top:0}h1{max-width:940px;margin-bottom:14px;font-size:clamp(2.2rem,6vw,5rem);line-height:.98;letter-spacing:0}h2{margin-bottom:18px;font-size:clamp(1.6rem,3vw,2.4rem);letter-spacing:0}h3{font-size:1.15rem;letter-spacing:0}p{color:var(--muted);line-height:1.7}.lead{max-width:820px;font-size:clamp(1rem,2vw,1.24rem)}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-flex;min-height:44px;align-items:center;justify-content:center;gap:10px;border:1px solid rgba(255,255,255,.16);border-radius:8px;padding:11px 16px;color:var(--text);background:#ffffff14;font-weight:800}.button.primary{border-color:transparent;background:var(--teal);color:#06111a}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}.card{overflow:hidden;border:1px solid rgba(255,255,255,.1);border-radius:8px;background:#141f31d1;box-shadow:var(--shadow)}.card-body{padding:18px}.thumb{aspect-ratio:16 / 9;width:100%;object-fit:cover;background:var(--panel-strong)}.meta-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.pill{display:inline-flex;align-items:center;min-height:26px;border-radius:999px;padding:4px 10px;background:#ffffff17;color:var(--soft);font-size:.78rem;font-weight:800}.pill.medium{background:#f8b84e2e;color:#ffd68a}.pill.easy{background:#2dd4bf29;color:#8af4e6}.pill.hard{background:#fb718529;color:#ffb0bd}.split{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:28px;align-items:start}.panel{border:1px solid rgba(255,255,255,.12);border-radius:8px;background:#141f31b8;padding:22px}.stack{display:grid;gap:16px}.media-frame{overflow:hidden;border:1px solid rgba(255,255,255,.1);border-radius:8px;background:#08111d;box-shadow:var(--shadow)}.video-wrap{position:relative;aspect-ratio:16 / 9;background:#08111d}.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.guide-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}.guide-list li{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:start;color:var(--soft);line-height:1.6}.guide-list span{display:grid;width:28px;height:28px;place-items:center;border-radius:50%;background:#60a5fa2e;color:#b9d7ff;font-size:.82rem;font-weight:900}.toolbar{display:grid;grid-template-columns:minmax(220px,1fr) auto;gap:12px;margin:24px 0}.search-input,.select-input{min-height:44px;border:1px solid rgba(255,255,255,.14);border-radius:8px;background:#ffffff12;color:var(--text);padding:0 14px;font:inherit}.select-input option{background:#101827;color:var(--text)}.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px;color:var(--muted);font-weight:700}.breadcrumbs a{color:var(--soft)}.page-header{padding:58px 0 30px}.site-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;width:min(1180px,calc(100% - 32px));margin:44px auto 0;padding:28px 0 40px;border-top:1px solid rgba(255,255,255,.12);color:var(--muted)}@media(max-width:760px){.site-header{align-items:flex-start;flex-direction:column;gap:12px}.site-header nav{width:100%}.site-header nav a{flex:1;text-align:center}.split,.toolbar{grid-template-columns:1fr}.page-header{padding-top:32px}h1{line-height:1.04}}