:root{--accent:#8a4df5;--accent-soft:#a274ff;--accent-deep:#5b2bd6;--accent-grad:linear-gradient(135deg, #a274ff 0%, #8a4df5 48%, #5b2bd6 100%);--danger:#f2545b;--radius-sm:10px;--radius:14px;--radius-lg:20px;--radius-xl:26px;--sidebar-w:264px;--content-max:1180px;--ease:cubic-bezier(.22, .61, .36, 1);--font:"Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif}:root,:root[data-theme=light]{--bg:#f7f7fa;--bg-grad:none;--surface:#fff;--surface-2:#f2f0f9;--surface-3:#e9e6f4;--sidebar-bg:#fff;--border:#18122817;--border-strong:#18122829;--text:#17132a;--text-soft:#423d59;--muted:#6e6884;--shadow-sm:0 1px 2px #1812280f, 0 1px 3px #1812280d;--shadow:0 10px 28px -12px #1812283d, 0 2px 6px #1812280d;--shadow-lg:0 28px 60px -24px #18122852;--accent-tint:#8a4df51a;--accent-tint-2:#8a4df533;--on-accent:#fff;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}:root[data-theme=dark]{--bg:#0a090f;--bg-grad:none;--surface:#131119;--surface-2:#191622;--surface-3:#221e2d;--sidebar-bg:#0d0c12;--border:#ffffff14;--border-strong:#ffffff29;--text:#ece9f6;--text-soft:#c7c1da;--muted:#8e87a5;--shadow-sm:0 1px 2px #0006;--shadow:0 14px 34px -16px #000000b3, 0 2px 6px #00000059;--shadow-lg:0 34px 70px -28px #000c;--accent-tint:#a274ff24;--accent-tint-2:#a274ff42;--on-accent:#fff;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body,#root{height:100%}body{font-family:var(--font);color:var(--text);background:var(--bg);background-image:var(--bg-grad);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;background-attachment:fixed;margin:0}h1,h2,h3,h4{letter-spacing:-.02em;margin:0;line-height:1.18}p{margin:0}img{max-width:100%;display:block}button{font:inherit;color:inherit;cursor:pointer}input,select,textarea{font:inherit}a{color:inherit;text-decoration:none}.muted{color:var(--muted)}:where(button,input,a,select,textarea):focus-visible{outline:2px solid var(--accent-soft);outline-offset:2px}.brand-mark{background:var(--accent-grad);border-radius:10px;flex:none;place-items:center;width:34px;height:34px;display:grid;overflow:hidden;box-shadow:0 6px 18px -8px #8a4df5cc}.brand-mark img{object-fit:cover;width:100%;height:100%}.brand-mark-lg{border-radius:14px;width:52px;height:52px}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}.btn-primary{border-radius:var(--radius-sm);background:var(--accent-grad);color:var(--on-accent);transition:filter .16s var(--ease), transform .16s var(--ease), opacity .16s var(--ease);border:0;justify-content:center;align-items:center;gap:8px;padding:12px 22px;font-size:14.5px;font-weight:700;display:inline-flex;box-shadow:0 12px 26px -14px #8a4df5e6}.btn-primary:hover:not(:disabled){filter:brightness(1.07)}.btn-primary:active:not(:disabled){transform:translateY(1px)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-outline{border:1px solid var(--border-strong);border-radius:var(--radius-sm);color:var(--text);transition:background .16s var(--ease), border-color .16s var(--ease);background:0 0;justify-content:center;align-items:center;gap:8px;padding:11px 20px;font-size:14px;font-weight:600;display:inline-flex}.btn-outline:hover{background:var(--surface-2);border-color:var(--accent-tint-2)}.btn-ghost{border-radius:var(--radius-sm);color:var(--muted);transition:background .16s var(--ease), color .16s var(--ease), opacity .16s var(--ease);background:0 0;border:0;align-items:center;gap:6px;padding:8px 12px;font-size:13.5px;font-weight:600;display:inline-flex}.btn-ghost:hover:not(:disabled){background:var(--surface-2);color:var(--text)}.btn-ghost:disabled{opacity:.4;cursor:not-allowed}.btn-sm{padding:9px 16px;font-size:13.5px}.app-shell{grid-template-columns:var(--sidebar-w) minmax(0, 1fr);min-height:100vh;display:grid}.sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border);z-index:40;flex-direction:column;gap:18px;height:100vh;padding:20px 16px 18px;display:flex;position:sticky;top:0}.brand{text-align:left;transition:background .18s var(--ease);background:0 0;border:0;border-radius:12px;align-items:center;gap:11px;padding:6px 8px;display:flex}.brand:hover{background:var(--surface-2)}.brand-name{letter-spacing:-.02em;font-size:16px;font-weight:700}.side-nav{flex-direction:column;flex:auto;gap:4px;display:flex}.side-nav-label{letter-spacing:.14em;text-transform:uppercase;color:var(--muted);padding:4px 12px 6px;font-size:10.5px;font-weight:800}.tab{width:100%;color:var(--muted);text-align:left;transition:background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);background:0 0;border:1px solid #0000;border-radius:11px;align-items:center;gap:11px;padding:10px 12px;font-size:14px;font-weight:600;display:flex;position:relative}.tab:hover{background:var(--surface-2);color:var(--text)}.tab-ico{flex:none;place-items:center;width:20px;height:20px;display:grid}.tab-ico svg{width:19px;height:19px}.tab.is-active{background:var(--accent-tint);border-color:var(--accent-tint-2);color:var(--text)}.tab.is-active .tab-ico{color:var(--accent-soft)}.tab-soon{background:var(--surface-3);color:var(--muted);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;border-radius:999px;margin-left:auto;padding:2px 7px;font-size:9.5px;font-weight:800}.tab:hover .tab-soon,.tab.is-active .tab-soon{background:var(--accent-tint-2);color:var(--accent-soft)}.tab.is-active:before{content:"";background:var(--accent-grad);border-radius:0 3px 3px 0;width:3px;height:22px;position:absolute;top:50%;left:-16px;transform:translateY(-50%)}.side-foot{flex-direction:column;gap:10px;display:flex}.theme-seg{background:var(--surface-2);border:1px solid var(--border);border-radius:11px;grid-template-columns:1fr 1fr;gap:3px;padding:3px;display:grid}.theme-seg-btn{color:var(--muted);transition:background .18s var(--ease), color .18s var(--ease);background:0 0;border:0;border-radius:8px;place-items:center;padding:7px 0;display:grid}.theme-seg-btn svg{width:16px;height:16px}.theme-seg-btn:hover{color:var(--text)}.theme-seg-btn.is-active{background:var(--surface);color:var(--accent-soft);box-shadow:var(--shadow-sm)}.user-chip{background:var(--surface-2);border:1px solid var(--border);border-radius:11px;align-items:center;gap:9px;padding:8px 10px;display:flex}.user-avatar{background:var(--accent-grad);color:#fff;border-radius:50%;flex:none;place-items:center;width:26px;height:26px;font-size:12px;font-weight:700;display:grid}.user-info{flex-direction:column;gap:2px;min-width:0;display:flex}.user-email{color:var(--text-soft);text-overflow:ellipsis;white-space:nowrap;font-size:12.5px;overflow:hidden}.user-level{letter-spacing:.04em;color:var(--accent-soft);text-overflow:ellipsis;white-space:nowrap;font-size:10.5px;font-weight:700;overflow:hidden}.side-logout{border:1px solid var(--border);color:var(--muted);transition:background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);background:0 0;border-radius:11px;justify-content:center;align-items:center;gap:8px;padding:9px 12px;font-size:13px;font-weight:600;display:flex}.side-logout svg{width:16px;height:16px}.side-logout:hover{color:var(--danger);background:#f2545b14;border-color:#f2545b66}.content{min-width:0}.wrap{max-width:var(--content-max);margin:0 auto;padding:34px 32px 64px}.topbar,.bottom-nav{display:none}.topbar{z-index:30;padding:10px 16px;padding-top:max(10px, env(safe-area-inset-top));background:color-mix(in srgb, var(--sidebar-bg) 88%, transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;position:sticky;top:0}.topbar-brand{background:0 0;border:0;align-items:center;gap:10px;padding:0;display:flex}.topbar-brand .brand-mark{border-radius:9px;width:30px;height:30px}.topbar-brand .brand-name{font-size:15px}.topbar-actions{align-items:center;gap:8px;display:flex}.topbar-actions .theme-seg{gap:2px;padding:2px}.topbar-actions .theme-seg-btn{padding:6px 10px}.topbar-logout{border:1px solid var(--border);width:34px;height:34px;color:var(--muted);background:0 0;border-radius:10px;place-items:center;display:grid}.topbar-logout svg{width:16px;height:16px}.bottom-nav{z-index:45;padding:6px 6px 0;padding-bottom:max(6px, env(safe-area-inset-bottom));background:color-mix(in srgb, var(--sidebar-bg) 92%, transparent);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-top:1px solid var(--border);grid-auto-columns:1fr;grid-auto-flow:column;align-items:stretch;gap:2px;position:fixed;inset:auto 0 0}.bnav-item{min-height:52px;color:var(--muted);transition:color .16s var(--ease), background .16s var(--ease);-webkit-tap-highlight-color:transparent;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;gap:3px;padding:6px 2px;display:flex}.bnav-item:active{background:var(--surface-2)}.bnav-ico{place-items:center;width:24px;height:24px;display:grid;position:relative}.bnav-ico svg{width:21px;height:21px}.bnav-label{letter-spacing:-.01em;font-size:10.5px;font-weight:600}.bnav-item.is-active{color:var(--accent-soft)}.bnav-item.is-active .bnav-ico:after{content:"";background:var(--accent-tint);z-index:-1;border-radius:999px;position:absolute;inset:-7px -9px}.bnav-dot{background:var(--accent);width:6px;height:6px;box-shadow:0 0 0 2px var(--sidebar-bg);border-radius:999px;position:absolute;top:-1px;right:-2px}@media (width<=900px){.app-shell{grid-template-rows:auto 1fr auto;grid-template-columns:minmax(0,1fr)}.sidebar{display:none}.topbar{display:flex}.bottom-nav{display:grid}.wrap{padding:20px 16px calc(84px + env(safe-area-inset-bottom))}}.auth-screen{place-items:center;min-height:100vh;padding:24px;display:grid}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:420px;box-shadow:var(--shadow-lg);padding:30px 28px 26px}.auth-brand{align-items:center;gap:14px;margin-bottom:22px;display:flex}.auth-brand h1{font-size:22px}.auth-brand p{margin-top:4px;font-size:13.5px}.auth-tabs{background:var(--surface-2);border:1px solid var(--border);border-radius:12px;grid-template-columns:1fr 1fr;gap:4px;margin-bottom:20px;padding:4px;display:grid}.auth-tab{color:var(--muted);transition:background .18s var(--ease), color .18s var(--ease);background:0 0;border:0;border-radius:9px;padding:9px 10px;font-size:13.5px;font-weight:600}.auth-tab:hover{color:var(--text)}.auth-tab.is-active{background:var(--surface);color:var(--text);box-shadow:var(--shadow-sm)}.auth-field{margin-bottom:14px;display:block}.auth-field span{color:var(--text-soft);margin-bottom:7px;font-size:12.5px;font-weight:600;display:block}.auth-field input{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);width:100%;color:var(--text);transition:border-color .18s var(--ease), box-shadow .18s var(--ease);padding:11px 13px}.auth-field input::placeholder{color:var(--muted)}.auth-field input:focus{border-color:var(--accent-soft);box-shadow:0 0 0 3px var(--accent-tint);outline:none}.auth-submit{border-radius:var(--radius-sm);background:var(--accent-grad);width:100%;color:var(--on-accent);transition:transform .16s var(--ease), filter .16s var(--ease), opacity .16s var(--ease);border:0;margin-top:8px;padding:12px 16px;font-size:14.5px;font-weight:700;box-shadow:0 12px 26px -14px #8a4df5e6}.auth-submit:hover:not(:disabled){filter:brightness(1.07)}.auth-submit:active:not(:disabled){transform:translateY(1px)}.auth-submit:disabled{opacity:.6;cursor:progress}.auth-error,.auth-notice{margin-top:12px;font-size:12.5px;line-height:1.5}.auth-error{color:var(--danger)}.auth-notice{color:var(--accent-soft)}.splash{align-content:center;place-items:center;gap:16px;min-height:100vh;display:grid}.splash-mark{animation:splash-pulse 1.4s var(--ease) infinite}.splash-label{color:var(--muted);font-size:13px}@keyframes splash-pulse{0%,to{opacity:.75;transform:scale(1)}50%{opacity:1;transform:scale(1.08)}}.onb-screen{place-items:center;min-height:100vh;padding:32px 20px;display:grid}.onb-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:620px;box-shadow:var(--shadow-lg);padding:34px 34px 30px}.onb-card-narrow{text-align:center;max-width:520px}.onb-card-narrow .onb-kicker{margin-bottom:18px}.onb-kicker{background:var(--accent-tint-2);border-color:var(--accent-tint-2);color:var(--accent-soft)}.onb-card h2{font-size:clamp(21px,2.6vw,27px);font-weight:800;line-height:1.25}.onb-lead{color:var(--text-soft);margin-top:14px;font-size:14.5px;line-height:1.65}.onb-hint{margin-top:14px;font-size:12.5px}.onb-card-narrow .btn-primary{margin-top:24px}.onb-top{align-items:center;gap:14px;margin-bottom:26px;display:flex}.onb-step{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);white-space:nowrap;font-size:11px;font-weight:800}.onb-bar{background:var(--surface-3);border:1px solid var(--border);border-radius:999px;width:100%;height:10px;overflow:hidden}.onb-bar-slim{border:0;height:6px}.onb-bar-fill{background:var(--accent-grad);height:100%;transition:width .3s var(--ease);border-radius:999px}.onb-card-narrow .onb-bar{margin-top:26px}.onb-bar-meta{justify-content:space-between;align-items:baseline;gap:12px;margin-top:10px;font-size:12.5px;display:flex}.onb-bar-pct{color:var(--accent-soft);font-variant-numeric:tabular-nums;font-weight:700}.onb-result{color:var(--text-soft);margin-top:18px;font-size:14px}.onb-result strong{color:var(--accent-soft)}.onb-question{font-size:clamp(19px,2.4vw,24px)}.onb-helper{margin-top:8px;font-size:13px}.onb-options{flex-direction:column;gap:10px;margin-top:22px;display:flex}.onb-option{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text);text-align:left;transition:background .16s var(--ease), border-color .16s var(--ease), transform .16s var(--ease);align-items:center;gap:12px;padding:14px 16px;font-size:14.5px;display:flex}.onb-option:hover{border-color:var(--accent-tint-2);background:var(--accent-tint)}.onb-option:active{transform:scale(.995)}.onb-option-mark{border:2px solid var(--border-strong);width:18px;height:18px;transition:border-color .16s var(--ease), box-shadow .16s var(--ease), background .16s var(--ease);border-radius:50%;flex:none}.onb-option.is-chosen{border-color:var(--accent);background:var(--accent-tint)}.onb-option.is-chosen .onb-option-mark{border-color:var(--accent);background:var(--accent);box-shadow:inset 0 0 0 3px var(--surface-2)}.onb-nav{justify-content:space-between;align-items:center;gap:14px;margin-top:24px;display:flex}.onb-score-hint{font-size:12px}@media (width<=560px){.onb-card{border-radius:var(--radius-lg);padding:26px 20px 22px}.onb-top{flex-direction:column;align-items:stretch;gap:10px}.onb-score-hint{display:none}}.onb-option.is-multi .onb-option-mark{border-radius:6px}.onb-option.is-multi.is-chosen .onb-option-mark{background:var(--accent);border-color:var(--accent);box-shadow:none;position:relative}.onb-option.is-multi.is-chosen .onb-option-mark:after{content:"";border:2px solid #fff;border-width:0 2px 2px 0;width:5px;height:9px;position:absolute;top:1px;left:4px;transform:rotate(45deg)}.onb-count{background:#ffffff3d;border-radius:999px;place-items:center;min-width:18px;height:18px;margin-left:4px;padding:0 5px;font-size:11px;font-weight:800;display:inline-grid}.proto-banner{border-radius:var(--radius-xl);box-shadow:var(--shadow);background:linear-gradient(100deg,#2b1064 0%,#4c1d95 34%,#6d28d9 62%,#8b5cf6 100%);border:1px solid #ffffff1a;margin-bottom:38px;padding:40px 40px 44px;position:relative;overflow:hidden}.banner-carousel{margin-bottom:38px;position:relative}.banner-stack{display:grid}.banner-stack>.proto-banner{opacity:0;visibility:hidden;pointer-events:none;transition:opacity .55s var(--ease), transform .55s var(--ease), visibility .55s;grid-area:1/1;align-items:center;margin-bottom:0;padding-bottom:30px;display:flex;transform:scale(.995)}.banner-stack>.proto-banner.is-active{opacity:1;visibility:visible;pointer-events:auto;transform:none}.banner-lead{font-weight:700;color:#fff!important}.banner-lead+p{max-width:60ch;margin-top:12px}.banner-dots{z-index:2;gap:2px;display:flex;position:absolute;bottom:10px;right:22px}.banner-dot{background:0 0;border:0;place-items:center;width:26px;height:26px;padding:0;display:grid}.banner-dot:after{content:"";width:8px;height:8px;transition:width .24s var(--ease), background .24s var(--ease);background:#ffffff6b;border-radius:999px}.banner-dot:hover:after{background:#ffffffb3}.banner-dot.is-active:after{background:#fff;width:20px}.soon-banner{margin-bottom:0}.soon-lead{font-weight:700;color:#fff!important}.soon-lead+p{max-width:60ch;margin-top:12px}.soon-mark{color:#fff;pointer-events:none;background:#ffffff1f;border:1px solid #fff3;border-radius:24px;place-items:center;width:86px;height:86px;display:grid;position:absolute;bottom:30px;right:34px}.soon-mark svg{opacity:.9;width:40px;height:40px}.proto-banner-glow{filter:blur(30px);pointer-events:none;background:radial-gradient(circle,#c4acffb8,#a78bfa4d 42%,#0000 68%);border-radius:50%;width:620px;height:620px;position:absolute;top:-220px;right:8%}.proto-banner-content{max-width:620px;position:relative}.proto-kicker{color:#fff;letter-spacing:.14em;text-transform:uppercase;background:#0c061c57;border:1px solid #ffffff38;border-radius:999px;align-items:center;padding:6px 13px;font-size:11px;font-weight:800;display:inline-flex}.proto-banner h2{color:#fff;margin:18px 0 10px;font-size:clamp(28px,4vw,40px);font-weight:800}.proto-banner p{color:#ffffffd6;max-width:46ch;font-size:15px;line-height:1.6}.proto-row-head{justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:16px;display:flex}.proto-row-head h3{font-size:17px;font-weight:700}.proto-row-head .muted{font-size:13px}.proto-row{scroll-snap-type:x proximity;scrollbar-width:thin;grid-auto-columns:minmax(200px,1fr);grid-auto-flow:column;gap:18px;margin:-4px -4px -18px;padding:4px 4px 18px;display:grid;overflow-x:auto}.proto-row::-webkit-scrollbar{height:8px}.proto-row::-webkit-scrollbar-track{background:0 0}.proto-row::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:99px}.proto-cover{scroll-snap-align:start;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface-3);box-shadow:var(--shadow-sm);cursor:pointer;text-align:left;transition:transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);padding:0;display:block;position:relative;overflow:hidden}.proto-cover:hover,.proto-cover:focus-visible{border-color:var(--accent-tint-2);box-shadow:var(--shadow), 0 18px 40px -22px #8a4df5b3;transform:translateY(-5px)}.proto-cover-art{aspect-ratio:2/3;background:var(--surface-3);position:relative;overflow:hidden}.proto-cover-art img{object-fit:cover;width:100%;height:100%;transition:transform .32s var(--ease)}.proto-cover:hover .proto-cover-art img{transform:scale(1.04)}.proto-cover-art:after{content:"";pointer-events:none;background:linear-gradient(#0000 58%,#06040cb8);position:absolute;inset:0}.proto-cover-info{justify-content:flex-end;align-items:center;padding:14px;display:flex;position:absolute;inset:auto 0 0}.proto-badge{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);color:#f2eefc;letter-spacing:.04em;white-space:nowrap;background:#0a06149e;border:1px solid #fff3;border-radius:999px;padding:4px 9px;font-size:10.5px;font-weight:700}.proto-badge.is-available{color:#fff;background:#8a4df5d9;border-color:#ffffff47}@media (width<=900px){.proto-banner{border-radius:var(--radius-lg);padding:26px 20px 28px}.proto-banner h2{margin:12px 0 8px;font-size:21px;line-height:1.22}.proto-kicker{padding:4px 10px;font-size:10px}.proto-banner p{font-size:13px;line-height:1.5}.banner-lead{font-size:14px!important}.banner-lead+p{margin-top:8px}.banner-dots{bottom:6px;right:12px}.soon-mark{display:none}.proto-row-head{margin-bottom:12px}.proto-row-head h3{font-size:15.5px}}@media (width<=700px){.proto-row{scroll-snap-type:x mandatory;grid-auto-columns:62vw;gap:14px;margin-left:-16px;margin-right:-16px;padding-left:16px;padding-right:16px;scroll-padding-left:16px}.proto-cover-info{padding:14px}}@media (width<=380px){.proto-row{grid-auto-columns:72vw}}.proto-error{border-radius:var(--radius);color:var(--danger);background:#f2545b14;border:1px solid #f2545b59;margin-bottom:16px;padding:12px 14px;font-size:13px}.lesson-page{display:block}.lesson-crumbs{align-items:center;gap:10px;margin-bottom:18px;font-size:12.5px;display:flex}.lesson-back{border:1px solid var(--border);color:var(--text-soft);transition:background .16s var(--ease), border-color .16s var(--ease), color .16s var(--ease);border-radius:999px;align-items:center;gap:6px;padding:6px 11px 6px 9px;font-weight:600;display:inline-flex}.lesson-back svg{width:14px;height:14px}.lesson-back:hover{background:var(--surface-2);border-color:var(--accent-tint-2);color:var(--text)}.lesson-crumb-sep,.lesson-crumb{color:var(--muted)}.lesson-layout{grid-template-columns:minmax(0,1fr) 344px;align-items:start;gap:24px;display:grid}.lesson-main{min-width:0}.lesson-player{aspect-ratio:16/9;border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow);background:#000;position:relative;overflow:hidden}.lesson-player iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.lesson-info{margin-top:20px}.lesson-eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--accent-soft);align-items:center;gap:8px;font-size:11px;font-weight:800;display:inline-flex}.lesson-title{margin-top:8px;font-size:clamp(21px,2.8vw,28px);font-weight:800}.lesson-duration{color:var(--muted);font-variant-numeric:tabular-nums;margin-top:8px;font-size:13px;display:inline-block}.lesson-nav{justify-content:space-between;gap:14px;margin-top:26px;display:flex}.lesson-step{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);max-width:48%;transition:border-color .16s var(--ease), background .16s var(--ease), transform .16s var(--ease);align-items:center;gap:12px;padding:12px 16px;display:inline-flex}.lesson-step:hover{border-color:var(--accent-tint-2);background:var(--surface-2);transform:translateY(-2px)}.lesson-step svg{width:17px;height:17px;color:var(--accent-soft);flex:none}.lesson-step-next{text-align:right;margin-left:auto}.lesson-step-body{flex-direction:column;gap:2px;min-width:0;display:flex}.lesson-step-label{letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-size:10.5px;font-weight:800}.lesson-step-title{color:var(--text);text-overflow:ellipsis;white-space:nowrap;font-size:13.5px;font-weight:600;overflow:hidden}.lesson-side{position:sticky;top:24px}.acc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.acc-head{border-bottom:1px solid var(--border);justify-content:space-between;align-items:baseline;gap:12px;padding:16px 18px;display:flex}.acc-head h3{font-size:14px;font-weight:700}.acc-head .muted{font-size:12px}.acc-module{border-bottom:1px solid var(--border)}.acc-module:last-child{border-bottom:0}.acc-trigger{text-align:left;width:100%;transition:background .16s var(--ease);background:0 0;border:0;align-items:center;gap:12px;padding:14px 16px;display:flex}.acc-trigger:hover:not(:disabled){background:var(--surface-2)}.acc-trigger:disabled{cursor:default;opacity:.55}.acc-num{background:var(--surface-3);width:28px;height:28px;color:var(--muted);font-variant-numeric:tabular-nums;border-radius:9px;flex:none;place-items:center;font-size:12px;font-weight:800;display:grid}.acc-module.is-current .acc-num{background:var(--accent-tint-2);color:var(--accent-soft)}.acc-titles{flex-direction:column;flex:auto;gap:2px;min-width:0;display:flex}.acc-title{color:var(--text);font-size:13.5px;font-weight:700}.acc-meta{color:var(--muted);font-size:11.5px}.acc-chevron{color:var(--muted);transition:transform .2s var(--ease);flex:none;place-items:center;display:grid}.acc-chevron svg{width:16px;height:16px}.acc-chevron.is-open{transform:rotate(180deg)}.acc-list{margin:0;padding:0 8px 10px;list-style:none}.acc-lesson{border-radius:var(--radius-sm);transition:background .16s var(--ease), border-color .16s var(--ease);border-left:2px solid #0000;align-items:center;gap:11px;padding:9px 10px;display:flex}.acc-lesson:hover{background:var(--surface-2)}.acc-lesson.is-active{background:var(--accent-tint);border-left-color:var(--accent)}.acc-lesson-num{text-align:center;width:20px;color:var(--muted);font-variant-numeric:tabular-nums;flex:none;font-size:11.5px;font-weight:700}.acc-lesson.is-active .acc-lesson-num{color:var(--accent-soft)}.acc-lesson-body{flex:auto;justify-content:space-between;align-items:baseline;gap:10px;min-width:0;display:flex}.acc-lesson-title{color:var(--text-soft);font-size:13px;line-height:1.35}.acc-lesson.is-active .acc-lesson-title{color:var(--text);font-weight:600}.acc-lesson-time{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap;font-size:11px}.acc-tag{background:var(--accent-tint-2);color:var(--accent-soft);letter-spacing:.06em;vertical-align:1px;border-radius:5px;margin-right:6px;padding:1px 6px;font-size:9.5px;font-weight:800;display:inline-block}.lesson-state{flex-direction:column;align-items:flex-start;gap:14px;padding:40px 0;display:flex}.lesson-state h2{font-size:22px}.lesson-skeleton{aspect-ratio:16/9;border-radius:var(--radius-lg);background:linear-gradient(100deg, var(--surface-2) 30%, var(--surface-3) 50%, var(--surface-2) 70%);background-size:220% 100%;width:100%;max-width:760px;animation:1.4s linear infinite lesson-shimmer}@keyframes lesson-shimmer{0%{background-position:120% 0}to{background-position:-20% 0}}@media (width<=1080px){.lesson-layout{grid-template-columns:minmax(0,1fr)}.lesson-side{position:static}}@media (width<=560px){.lesson-nav{flex-direction:column}.lesson-step,.lesson-step-next{text-align:left;max-width:100%;margin-left:0}}.install-backdrop{z-index:80;padding:16px;padding-bottom:max(16px, env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);animation:install-fade .22s var(--ease);background:#06040c99;place-items:end center;display:grid;position:fixed;inset:0}@media (width>=640px){.install-backdrop{place-items:center}}.install-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:440px;box-shadow:var(--shadow-lg);animation:install-rise .28s var(--ease);padding:26px 24px 20px;position:relative}.install-mark{border-radius:14px;width:48px;height:48px;margin-bottom:16px;overflow:hidden;box-shadow:0 8px 20px -10px #8a4df5e6}.install-card h2{padding-right:28px;font-size:19px;font-weight:800;line-height:1.3}.install-lead{color:var(--text-soft);margin-top:10px;font-size:13.5px;line-height:1.6}.install-hint{margin-top:12px;font-size:12px;line-height:1.5}.install-actions{flex-wrap:wrap;align-items:center;gap:8px;margin-top:20px;display:flex}.install-choices{grid-template-columns:1fr 1fr;gap:10px;margin-top:18px;display:grid}.install-choice{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);color:var(--text);transition:background .16s var(--ease), border-color .16s var(--ease), transform .16s var(--ease);flex-direction:column;align-items:center;gap:8px;padding:18px 12px;font-size:14px;font-weight:700;display:flex}.install-choice:hover{background:var(--accent-tint);border-color:var(--accent-tint-2)}.install-choice:active{transform:scale(.98)}.install-choice-ico{font-size:26px;line-height:1}.install-steps{flex-direction:column;gap:12px;margin:18px 0 0;padding:0;list-style:none;display:flex}.install-steps li{color:var(--text-soft);align-items:flex-start;gap:11px;font-size:13.5px;line-height:1.5;display:flex}.install-steps b{color:var(--text)}.install-step-num{background:var(--accent-tint-2);width:22px;height:22px;color:var(--accent-soft);border-radius:999px;flex:none;place-items:center;font-size:11.5px;font-weight:800;display:grid}.install-never{border-top:1px solid var(--border);color:var(--muted);cursor:pointer;align-items:center;gap:9px;margin-top:18px;padding-top:14px;font-size:12.5px;display:flex}.install-never input{width:16px;height:16px;accent-color:var(--accent);cursor:pointer}.install-close{width:30px;height:30px;color:var(--muted);transition:background .16s var(--ease), color .16s var(--ease);background:0 0;border:0;border-radius:9px;place-items:center;font-size:14px;display:grid;position:absolute;top:14px;right:14px}.install-close:hover{background:var(--surface-2);color:var(--text)}@keyframes install-fade{0%{opacity:0}}@keyframes install-rise{0%{opacity:0;transform:translateY(14px)}}.toast{background:var(--surface);border:1px solid var(--border-strong);box-shadow:var(--shadow-lg);color:var(--text);opacity:0;pointer-events:none;transition:opacity .2s var(--ease), transform .2s var(--ease);z-index:90;border-radius:999px;padding:11px 18px;font-size:13.5px;font-weight:600;position:fixed;bottom:26px;left:50%;transform:translate(-50%,14px)}.toast.is-visible{opacity:1;transform:translate(-50%)}