@import"https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap";:root{--landing-bg: #0c0e12;--landing-panel: #14171d;--landing-panel-inset: #0f1318;--landing-accent: #e2532a;--landing-accent-hover: #eb6843;--landing-text: #f4f5f6;--landing-text-secondary: #c2c8d0;--landing-text-muted: #a0a6b0;--landing-text-dim: #8b919b;--landing-text-faint: #6c727c;--landing-text-faintest: #5f656f;--landing-border: rgba(255, 255, 255, .06);--landing-border-card: rgba(255, 255, 255, .07);--landing-border-strong: rgba(255, 255, 255, .16)}.landing{background:var(--landing-bg);color:var(--landing-text);font-family:Helvetica Neue,Helvetica,Arial,sans-serif;min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;scroll-behavior:smooth}.landing *,.landing *:before,.landing *:after{box-sizing:border-box}.landing ::selection{background:var(--landing-accent);color:#fff}.landing-nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:color-mix(in srgb,var(--landing-bg) 78%,transparent);border-bottom:1px solid var(--landing-border)}.landing-nav-inner{max-width:1200px;margin:0 auto;padding:16px 32px;display:flex;align-items:center;justify-content:space-between}.landing-logo{display:flex;gap:11px;align-items:center;text-decoration:none}.landing-logo-mark{width:30px;height:30px;border-radius:8px;background:color-mix(in srgb,var(--landing-accent) 18%,var(--landing-panel));display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;flex-shrink:0}.landing-logo-bar{width:16px;height:2.5px;border-radius:1px;background:var(--landing-accent)}.landing-logo-text{font-weight:600;font-size:19px;letter-spacing:-.02em;color:var(--landing-text)}.landing-nav-links{display:flex;gap:32px;align-items:center;list-style:none;margin:0;padding:0}.landing-nav-link{font-size:15px;color:var(--landing-text-muted);text-decoration:none;transition:color .14s;cursor:pointer}.landing-nav-link:hover{color:var(--landing-text)}.landing-btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--landing-accent);color:#fff;font-weight:600;font-size:15px;padding:11px 18px;border-radius:9px;border:none;cursor:pointer;text-decoration:none;transition:background .14s,transform .14s;line-height:1}.landing-btn-primary:hover{background:var(--landing-accent-hover)}.landing-btn-primary:active{transform:scale(.97)}.landing-btn-primary--lg{padding:16px 26px;font-size:16px;border-radius:11px}.landing-btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:transparent;color:var(--landing-text);font-weight:500;font-size:15px;padding:11px 18px;border-radius:11px;border:1px solid var(--landing-border-strong);cursor:pointer;text-decoration:none;transition:border-color .14s,background .14s,transform .14s;line-height:1}.landing-btn-ghost:hover{border-color:#ffffff47;background:#ffffff0a}.landing-btn-ghost:active{transform:scale(.97)}.landing-btn-ghost--lg{padding:16px 26px;font-size:16px}.landing-container{max-width:1200px;margin:0 auto;padding:0 32px}.landing-section{padding:104px 0;border-top:1px solid var(--landing-border)}.landing-hero{padding:72px 0 104px;position:relative}.landing-hero-glow{position:absolute;top:-180px;left:50%;transform:translate(-50%);width:900px;height:600px;background:radial-gradient(ellipse at center,color-mix(in srgb,var(--landing-accent) 10%,transparent) 0%,transparent 70%);pointer-events:none;z-index:0}.landing-hero-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(420px,1fr));gap:56px;align-items:center;position:relative;z-index:1}.landing-eyebrow{font-family:JetBrains Mono,monospace;font-size:12px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--landing-accent);margin-bottom:18px}.landing-h1{font-size:62px;font-weight:600;line-height:1.03;letter-spacing:-.035em;color:var(--landing-text);margin:0 0 24px}.landing-h2{font-size:44px;font-weight:600;line-height:1.08;letter-spacing:-.025em;color:var(--landing-text);margin:0 0 18px}.landing-h3{font-size:24px;font-weight:600;line-height:1.2;letter-spacing:-.015em;color:var(--landing-text);margin:0 0 10px}.landing-body{font-size:17px;font-weight:400;line-height:1.6;color:var(--landing-text-muted);margin:0 0 28px}.landing-body--lg{font-size:18px}.landing-trust{font-family:JetBrains Mono,monospace;font-size:12px;font-weight:400;letter-spacing:.12em;text-transform:uppercase;color:var(--landing-text-faintest)}.landing-window{background:var(--landing-panel);border:1px solid var(--landing-border-card);border-radius:14px;overflow:hidden;box-shadow:0 2px 40px #00000059,0 0 0 1px #ffffff08 inset}.landing-window-titlebar{display:flex;align-items:center;gap:10px;padding:13px 16px;border-bottom:1px solid var(--landing-border);background:var(--landing-panel-inset)}.landing-window-dots{display:flex;gap:6px}.landing-window-dot{width:10px;height:10px;border-radius:50%;background:#ffffff14}.landing-window-dot--close{background:#ff5f57}.landing-window-dot--min{background:#febc2e}.landing-window-dot--max{background:#28c840}.landing-window-url{flex:1;text-align:center;font-size:12px;color:var(--landing-text-faint);font-family:JetBrains Mono,monospace;letter-spacing:.02em}.landing-window-body{display:grid;grid-template-columns:1fr 260px}.landing-window-body--single{grid-template-columns:1fr}.landing-player{position:relative;background:#000;aspect-ratio:16 / 9;display:flex;align-items:center;justify-content:center;overflow:hidden}.landing-player-badge{position:absolute;top:12px;left:12px;display:inline-flex;align-items:center;gap:5px;background:#0009;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-radius:6px;padding:5px 10px;font-size:11px;font-weight:500;color:var(--landing-text-secondary)}.landing-player-badge-dot{width:6px;height:6px;border-radius:50%;background:var(--landing-accent)}.landing-play-btn{width:56px;height:56px;border-radius:50%;background:#ffffff1f;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.18);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .14s,transform .14s}.landing-play-btn:hover{background:#fff3;transform:scale(1.06)}.landing-play-btn-icon{width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}.landing-scrubber{position:absolute;bottom:0;left:0;right:0;height:4px;background:#ffffff1a}.landing-scrubber-fill{height:100%;width:35%;background:var(--landing-accent);border-radius:0 2px 2px 0}.landing-lesson-info{padding:16px 18px;border-bottom:1px solid var(--landing-border)}.landing-lesson-title{font-size:15px;font-weight:600;color:var(--landing-text);margin:0 0 4px}.landing-lesson-meta{font-size:12px;color:var(--landing-text-faint);display:flex;gap:12px;align-items:center}.landing-up-next{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;background:#ffffff0a;border:1px solid var(--landing-border);border-radius:100px;font-size:12px;color:var(--landing-text-dim);margin-top:10px}.landing-up-next-label{color:var(--landing-text-faintest);font-weight:500}.landing-curriculum{border-left:1px solid var(--landing-border);background:var(--landing-panel-inset);overflow-y:auto;max-height:400px}.landing-curriculum-header{padding:14px 16px;font-size:13px;font-weight:600;color:var(--landing-text-secondary);border-bottom:1px solid var(--landing-border);letter-spacing:-.01em}.landing-module-header{padding:12px 16px 6px;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--landing-text-faintest)}.landing-lesson-row{display:flex;align-items:center;gap:10px;padding:9px 16px;font-size:13px;color:var(--landing-text-dim);cursor:default;transition:background .14s;border-left:2px solid transparent}.landing-lesson-row:hover{background:#ffffff05}.landing-lesson-row--done{color:var(--landing-text-faint)}.landing-lesson-row--active{color:var(--landing-text);background:#e2532a0f;border-left-color:var(--landing-accent)}.landing-lesson-row--todo{color:var(--landing-text-dim)}.landing-lesson-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.landing-lesson-dot--done{background:var(--landing-text-faint)}.landing-lesson-dot--active{background:var(--landing-accent);box-shadow:0 0 6px color-mix(in srgb,var(--landing-accent) 40%,transparent)}.landing-lesson-dot--todo{background:transparent;border:1.5px solid var(--landing-text-faintest)}.landing-lesson-dur{margin-left:auto;font-size:11px;font-family:JetBrains Mono,monospace;color:var(--landing-text-faintest)}.landing-cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.landing-card{background:var(--landing-panel);border:1px solid var(--landing-border-card);border-radius:16px;padding:32px 28px;transition:border-color .14s,box-shadow .14s}.landing-card:hover{border-color:#ffffff1f;box-shadow:0 4px 24px #0003}.landing-step-num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:8px;background:color-mix(in srgb,var(--landing-accent) 12%,var(--landing-panel));color:var(--landing-accent);font-family:JetBrains Mono,monospace;font-size:14px;font-weight:600;margin-bottom:20px}.landing-card-visual{width:100%;border-radius:10px;background:var(--landing-panel-inset);border:1px solid var(--landing-border);padding:20px;margin-bottom:22px;min-height:120px;display:flex;align-items:center;justify-content:center;overflow:hidden}.landing-mini-bar{height:6px;border-radius:3px;background:#ffffff0f}.landing-mini-bar--accent{background:color-mix(in srgb,var(--landing-accent) 40%,transparent)}.landing-mini-bar--filled{background:var(--landing-accent)}.landing-mini-circle{width:36px;height:36px;border-radius:50%;background:#ffffff0f}.landing-mini-circle--accent{background:color-mix(in srgb,var(--landing-accent) 20%,transparent)}.landing-mini-tag{display:inline-flex;padding:4px 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30%,transparent);color:var(--landing-accent)}.landing-pos-chip--active:hover{border-color:color-mix(in srgb,var(--landing-accent) 50%,transparent);color:var(--landing-accent)}.landing-pos-add{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;border:1px dashed var(--landing-border-strong);background:transparent;color:var(--landing-text-faint);font-size:18px;cursor:pointer;transition:border-color .14s,color .14s}.landing-pos-add:hover{border-color:#ffffff47;color:var(--landing-text-secondary)}.landing-video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.landing-video-card{background:var(--landing-panel);border:1px solid var(--landing-border-card);border-radius:12px;overflow:hidden;transition:border-color .14s,transform .14s,box-shadow .14s;cursor:pointer}.landing-video-card:hover{border-color:#ffffff1f;transform:translateY(-2px);box-shadow:0 8px 28px #00000040}.landing-video-thumb{position:relative;width:100%;aspect-ratio:16 / 9;background:var(--landing-panel-inset);display:flex;align-items:center;justify-content:center;overflow:hidden}.landing-video-thumb-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0000004d;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .14s}.landing-video-card:hover .landing-video-thumb-overlay{opacity:1}.landing-video-tag{position:absolute;top:8px;left:8px;display:inline-flex;padding:3px 8px;border-radius:5px;font-size:10px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;background:#0000008c;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);color:var(--landing-text-secondary)}.landing-video-tag--accent{background:var(--landing-accent);color:#fff}.landing-video-dur{position:absolute;bottom:8px;right:8px;display:inline-flex;padding:2px 7px;border-radius:4px;font-size:11px;font-family:JetBrains 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var(--line);border-radius:10px;overflow:hidden}.thumb{width:100%;aspect-ratio:16/9;background:var(--panel-2);object-fit:cover;display:block}.card-body{padding:10px 12px}.card h4{margin:0 0 4px;font-size:14px}.crumb{color:var(--muted);font-size:12px}.bubble{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;border:2px solid var(--line);font-size:12px}.bubble.done{background:var(--good);border-color:var(--good);color:#04120c}.duration{color:var(--muted);font-size:12px}.auth{max-width:420px;margin:0 auto;display:flex;flex-direction:column;justify-content:center;min-height:100vh;padding:0 20px}.auth-card{background:var(--panel);padding:36px;border:1px solid var(--line);border-radius:16px;box-shadow:0 2px 40px #00000059,0 0 0 1px #ffffff08 inset}.auth h1{margin-top:0}.error{color:#ff6b6b;margin:8px 0;font-size:14px}.browse{display:grid;grid-template-columns:260px 1fr;gap:20px}.tree{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px}.tree ul{list-style:none;margin:0;padding-left:14px}.tree li>button{background:none;border:none;color:var(--text);padding:4px 0;text-align:left;width:100%}.tree li>button.sel{color:var(--accent);font-weight:600}.chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}.chip{border:1px solid var(--line);border-radius:999px;padding:4px 12px;color:var(--muted);background:var(--panel)}.chip.sel{border-color:var(--accent);color:var(--text)}.module{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin-bottom:14px}.module h3{margin:0;padding:12px 14px;border-bottom:1px solid var(--line)}.item{display:flex;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--line)}.item:last-child{border-bottom:none}.progress-bar{height:8px;background:var(--panel-2);border-radius:999px;overflow:hidden}.progress-bar>div{height:100%;background:var(--good)}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}th{color:var(--muted);font-weight:600}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.section{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;margin-bottom:18px}.hint{color:var(--muted);font-size:13px}.linkbox{background:var(--panel-2);border:1px dashed var(--line);padding:8px 10px;border-radius:8px;word-break:break-all}@media(max-width:760px){.browse{grid-template-columns:1fr}}