:root{
  --bg:#07100f;--bg-soft:#0a1513;--surface:#0d1a17;--surface-2:#11211d;--surface-3:#162923;
  --line:#254038;--line-soft:#19322c;--text:#f1fff9;--text-soft:#c7ddd5;--muted:#8fac9f;
  --accent:#5cf2bd;--accent-2:#54d8ff;--accent-3:#ffd166;--danger:#ff7380;--success:#5cf2bd;
  --shadow:0 24px 70px rgba(0,0,0,.28);--radius:20px;--header-h:72px;--nav-w:82px;
}
html[data-theme="light"]{
  --bg:#edf5f1;--bg-soft:#e5f0eb;--surface:#fff;--surface-2:#f6fbf8;--surface-3:#eaf5f0;
  --line:#c7ddd4;--line-soft:#dceae4;--text:#10231e;--text-soft:#2e4b42;--muted:#607d72;
  --shadow:0 22px 58px rgba(35,77,64,.13);
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{min-width:320px;overflow-x:hidden;background:radial-gradient(circle at 80% -10%,rgba(92,242,189,.08),transparent 34%),var(--bg);color:var(--text);font:15px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
button,input,textarea,select{font:inherit}button{cursor:pointer}a{color:inherit}img,video{max-width:100%}.hidden{display:none!important}.muted{color:var(--muted)}.eyebrow{margin:0 0 7px;color:var(--accent);font-size:11px;font-weight:850;letter-spacing:.16em;text-transform:uppercase}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.workspace{min-height:100vh}.topbar{position:fixed;inset:0 0 auto 0;z-index:80;height:var(--header-h);display:flex;align-items:center;gap:18px;padding:0 22px 0 18px;border-bottom:1px solid var(--line-soft);background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(18px)}
.brand{display:flex;align-items:center;gap:12px;min-width:250px;text-decoration:none}.brand-mark{width:42px;height:42px;display:grid;place-items:center;overflow:hidden;border:1px solid color-mix(in srgb,var(--accent) 38%,var(--line));border-radius:13px;background:color-mix(in srgb,var(--accent) 10%,var(--surface));color:var(--accent);font-size:13px;font-weight:900;letter-spacing:-.02em}.brand-mark img{width:100%;height:100%;object-fit:cover}.brand-copy strong{display:block;font-size:15px;line-height:1.2}.brand-copy span{display:block;margin-top:2px;color:var(--muted);font-size:11px}.topbar-center{flex:1;display:flex;justify-content:center}.status-pill{display:flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--line-soft);border-radius:999px;background:var(--surface);color:var(--text-soft);font-size:12px}.status-dot{width:7px;height:7px;border-radius:50%;background:var(--success);box-shadow:0 0 0 5px color-mix(in srgb,var(--success) 11%,transparent)}.offline .status-dot{background:var(--danger);box-shadow:0 0 0 5px color-mix(in srgb,var(--danger) 11%,transparent)}
.topbar-actions{display:flex;align-items:center;gap:8px}.icon-btn,.plain-btn,.primary-btn,.secondary-btn,.danger-btn{min-height:42px;border-radius:12px;font-weight:780;transition:.18s ease}.icon-btn{width:42px;padding:0;border:1px solid var(--line);background:var(--surface);color:var(--text);display:grid;place-items:center}.icon-btn:hover,.plain-btn:hover,.secondary-btn:hover{border-color:color-mix(in srgb,var(--accent) 45%,var(--line));transform:translateY(-1px)}.plain-btn,.secondary-btn{padding:0 14px;border:1px solid var(--line);background:var(--surface);color:var(--text)}.primary-btn{padding:0 17px;border:1px solid transparent;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#042017;box-shadow:0 9px 26px color-mix(in srgb,var(--accent) 18%,transparent)}.primary-btn:hover{filter:brightness(1.04);transform:translateY(-1px)}.danger-btn{padding:0 15px;border:1px solid color-mix(in srgb,var(--danger) 45%,var(--line));background:color-mix(in srgb,var(--danger) 10%,var(--surface));color:var(--danger)}button:disabled{opacity:.55;cursor:not-allowed;transform:none!important}.account-icon{display:none;width:20px;height:20px}.account-icon svg{width:20px;height:20px}.account-label{max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.side-nav{position:fixed;left:0;top:var(--header-h);bottom:0;z-index:60;width:var(--nav-w);padding:16px 12px;display:flex;flex-direction:column;gap:8px;border-right:1px solid var(--line-soft);background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(18px)}.nav-item{position:relative;width:56px;min-height:52px;display:grid;place-items:center;border:1px solid transparent;border-radius:15px;background:transparent;color:var(--muted)}.nav-item svg{width:21px;height:21px}.nav-item:hover,.nav-item.active{background:var(--surface);border-color:var(--line);color:var(--text)}.nav-item.active::before{content:"";position:absolute;left:-13px;width:3px;height:26px;border-radius:0 5px 5px 0;background:var(--accent)}.nav-item span{position:absolute;left:68px;padding:6px 9px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--text);font-size:12px;white-space:nowrap;opacity:0;pointer-events:none;transform:translateX(-4px);transition:.16s}.nav-item:hover span{opacity:1;transform:none}.side-nav-bottom{margin-top:auto}
.main{padding:calc(var(--header-h) + 28px) 26px 40px calc(var(--nav-w) + 26px)}.page{display:none;max-width:1480px;margin:0 auto}.page.active{display:block}.panel{border:1px solid var(--line-soft);border-radius:var(--radius);background:linear-gradient(180deg,color-mix(in srgb,var(--surface) 96%,transparent),color-mix(in srgb,var(--surface-2) 96%,transparent));box-shadow:var(--shadow)}
.hero{position:relative;min-height:390px;overflow:hidden;padding:42px;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(300px,.7fr);gap:34px;align-items:center}.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,color-mix(in srgb,var(--accent) 8%,transparent),transparent 48%),radial-gradient(circle at 86% 22%,color-mix(in srgb,var(--accent-2) 13%,transparent),transparent 26%);pointer-events:none}.hero-copy,.hero-visual{position:relative}.hero h1{max-width:850px;margin:0;font-size:clamp(38px,6.2vw,76px);line-height:.98;letter-spacing:-.062em}.hero h1 em{font-style:normal;color:var(--accent)}.hero-sub{max-width:720px;margin:20px 0 0;color:var(--text-soft);font-size:clamp(16px,2vw,19px)}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}.safety-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.safety-chip{display:flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid var(--line-soft);border-radius:999px;background:color-mix(in srgb,var(--surface) 68%,transparent);color:var(--muted);font-size:11px}.safety-chip i{width:5px;height:5px;border-radius:50%;background:var(--accent)}
.radar{position:relative;width:min(100%,340px);aspect-ratio:1;margin:auto;border:1px solid color-mix(in srgb,var(--accent) 22%,var(--line));border-radius:50%;background:repeating-radial-gradient(circle,transparent 0 17%,color-mix(in srgb,var(--accent) 10%,transparent) 17.5% 18%,transparent 18.5% 34%),linear-gradient(90deg,transparent 49.7%,color-mix(in srgb,var(--accent) 12%,transparent) 50%,transparent 50.3%),linear-gradient(0deg,transparent 49.7%,color-mix(in srgb,var(--accent) 12%,transparent) 50%,transparent 50.3%)}.radar::before{content:"";position:absolute;inset:7%;border-radius:50%;background:conic-gradient(from 0deg,color-mix(in srgb,var(--accent) 40%,transparent),transparent 21%);animation:radarSpin 7s linear infinite}.radar::after{content:"";position:absolute;inset:50% auto auto 50%;width:11px;height:11px;border-radius:50%;background:var(--accent);box-shadow:-72px 42px 0 -2px var(--accent-2),54px -77px 0 -2px var(--accent-3),83px 50px 0 -3px var(--accent);transform:translate(-50%,-50%)}.radar-center{position:absolute;inset:34%;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:color-mix(in srgb,var(--surface) 87%,transparent);backdrop-filter:blur(6px);font-size:12px;font-weight:850;letter-spacing:.12em;text-align:center;color:var(--text-soft)}@keyframes radarSpin{to{transform:rotate(360deg)}}
.dashboard-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:18px;margin-top:18px}.section-panel{padding:24px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:18px}.section-heading h2{margin:0;font-size:clamp(24px,3vw,34px);letter-spacing:-.04em}.section-heading p:not(.eyebrow){margin:5px 0 0;color:var(--muted)}.section-tools{display:flex;align-items:center;gap:8px}.track-filters{display:flex;gap:8px;overflow:auto;padding:2px 2px 10px;scrollbar-width:none}.track-filters::-webkit-scrollbar{display:none}.filter-chip{flex:0 0 auto;min-height:36px;padding:0 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:12px;font-weight:750}.filter-chip.active{border-color:color-mix(in srgb,var(--accent) 55%,var(--line));background:color-mix(in srgb,var(--accent) 11%,var(--surface));color:var(--text)}
.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.course-card{position:relative;min-height:205px;padding:20px;overflow:hidden;border:1px solid var(--line-soft);border-radius:17px;background:var(--surface-2);text-align:left;color:var(--text);transition:.18s}.course-card::after{content:"";position:absolute;width:130px;height:130px;right:-48px;bottom:-66px;border-radius:50%;background:color-mix(in srgb,var(--course-accent,var(--accent)) 13%,transparent)}.course-card:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--course-accent,var(--accent)) 50%,var(--line));box-shadow:0 18px 40px rgba(0,0,0,.16)}.course-card.active{border-color:var(--course-accent,var(--accent));box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--course-accent,var(--accent)) 30%,transparent)}.course-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.course-icon{width:43px;height:43px;display:grid;place-items:center;border:1px solid color-mix(in srgb,var(--course-accent,var(--accent)) 38%,var(--line));border-radius:13px;background:color-mix(in srgb,var(--course-accent,var(--accent)) 10%,var(--surface));font-size:20px}.course-badge{padding:5px 8px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:10px;font-weight:800;text-transform:uppercase}.course-card h3{margin:18px 0 6px;font-size:18px;line-height:1.25}.course-card p{margin:0;color:var(--muted);font-size:13px}.course-foot{position:absolute;left:20px;right:20px;bottom:17px;display:flex;justify-content:space-between;color:var(--text-soft);font-size:11px}.lock-label{color:var(--accent-3)}
.side-summary{padding:24px;display:flex;flex-direction:column;gap:18px}.date-card{padding-bottom:18px;border-bottom:1px solid var(--line-soft)}.date-card strong{display:block;font-size:30px;letter-spacing:-.04em}.date-card span{color:var(--muted)}.metric-stack{display:grid;grid-template-columns:1fr 1fr;gap:10px}.metric{padding:15px;border:1px solid var(--line-soft);border-radius:14px;background:var(--surface-2)}.metric strong{display:block;font-size:26px}.metric span{color:var(--muted);font-size:11px}.resume-card{padding:16px;border:1px solid color-mix(in srgb,var(--accent) 26%,var(--line));border-radius:15px;background:color-mix(in srgb,var(--accent) 6%,var(--surface-2))}.resume-card h3{margin:0 0 5px;font-size:16px}.resume-card p{margin:0 0 13px;color:var(--muted);font-size:12px}.notice{padding:14px;border-left:3px solid var(--accent-3);border-radius:0 12px 12px 0;background:color-mix(in srgb,var(--accent-3) 7%,var(--surface-2));color:var(--text-soft);font-size:12px}
.ad-slot:empty{display:none}.ad-slot{margin:18px 0;padding:12px;border:1px dashed var(--line);border-radius:14px;background:var(--surface-2)}.ad-label{display:block;margin-bottom:7px;color:var(--muted);font-size:9px;letter-spacing:.15em;text-transform:uppercase}
.learning-layout{display:grid;grid-template-columns:310px minmax(0,1fr);gap:18px;align-items:start}.lesson-sidebar{position:sticky;top:calc(var(--header-h) + 20px);max-height:calc(100vh - var(--header-h) - 40px);overflow:hidden;display:flex;flex-direction:column}.lesson-sidebar-head{padding:20px;border-bottom:1px solid var(--line-soft)}.lesson-sidebar-head h2{margin:0;font-size:20px}.lesson-sidebar-head p{margin:5px 0 0;color:var(--muted);font-size:12px}.lesson-search{display:flex;gap:7px;margin-top:14px}.lesson-search input{min-width:0;flex:1}.lesson-list{overflow:auto;padding:10px}.lesson-item{width:100%;display:grid;grid-template-columns:32px minmax(0,1fr) auto;gap:10px;align-items:center;padding:12px;border:1px solid transparent;border-radius:12px;background:transparent;color:var(--text);text-align:left}.lesson-item:hover{background:var(--surface-2)}.lesson-item.active{border-color:color-mix(in srgb,var(--accent) 37%,var(--line));background:color-mix(in srgb,var(--accent) 8%,var(--surface-2))}.lesson-number{width:30px;height:30px;display:grid;place-items:center;border:1px solid var(--line);border-radius:9px;color:var(--muted);font-size:10px;font-weight:850}.lesson-item.active .lesson-number,.lesson-item.complete .lesson-number{border-color:var(--accent);color:var(--accent)}.lesson-copy strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}.lesson-copy span{display:block;color:var(--muted);font-size:10px}.lesson-check{color:var(--accent);font-size:12px}
.lesson-main{min-width:0}.lesson-hero{padding:28px}.lesson-hero-top{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}.lesson-hero h1{margin:0;font-size:clamp(30px,5vw,52px);line-height:1.02;letter-spacing:-.052em}.lesson-summary{max-width:850px;margin:14px 0 0;color:var(--text-soft);font-size:16px}.lesson-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.meta-chip{padding:7px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface-2);color:var(--muted);font-size:11px}.lesson-actions{display:flex;gap:8px;flex-wrap:wrap}.progress-track{height:5px;margin-top:24px;overflow:hidden;border-radius:999px;background:var(--surface-3)}.progress-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .25s}.blocks{display:grid;gap:14px;margin-top:14px}.content-block{overflow:hidden}.block-head{width:100%;display:flex;align-items:center;gap:13px;padding:18px 20px;border:0;background:transparent;color:var(--text);text-align:left}.block-index{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border:1px solid var(--line);border-radius:10px;color:var(--accent);font-size:10px;font-weight:900}.block-title{min-width:0;flex:1}.block-title strong{display:block;font-size:15px}.block-title span{display:block;margin-top:2px;color:var(--muted);font-size:11px}.block-toggle{color:var(--muted);transition:.18s}.content-block.open .block-toggle{transform:rotate(180deg)}.block-body{display:none;padding:0 20px 22px;border-top:1px solid var(--line-soft)}.content-block.open .block-body{display:block}.content-block.highlight{border-color:color-mix(in srgb,var(--accent) 29%,var(--line))}.content-block.task{border-color:color-mix(in srgb,var(--accent-2) 25%,var(--line))}.content-block.quiz{border-color:color-mix(in srgb,var(--accent-3) 25%,var(--line))}
.rich-text{padding-top:18px;color:var(--text-soft)}.rich-text h1,.rich-text h2,.rich-text h3{color:var(--text);letter-spacing:-.03em}.rich-text h1{font-size:29px}.rich-text h2{font-size:23px}.rich-text h3{font-size:18px}.rich-text p{margin:0 0 14px}.rich-text ul,.rich-text ol{padding-left:22px}.rich-text li{margin:7px 0}.rich-text strong{color:var(--text)}.rich-text code{padding:2px 6px;border:1px solid var(--line);border-radius:6px;background:var(--surface-3);color:var(--accent);font:12px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace}.rich-text blockquote{margin:16px 0;padding:12px 15px;border-left:3px solid var(--accent);background:var(--surface-2)}.code-box{margin-top:15px;overflow:hidden;border:1px solid var(--line);border-radius:13px;background:#050b0a}.code-box-head{display:flex;justify-content:space-between;align-items:center;padding:9px 12px;border-bottom:1px solid #19322c;color:#9db9af;font-size:11px}.code-box pre{margin:0;padding:16px;overflow:auto;color:#dfffee;font:12px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace}.media-frame{margin-top:16px;overflow:hidden;border:1px solid var(--line);border-radius:14px;background:#030706}.media-frame iframe{width:100%;height:460px;border:0}.media-frame img,.media-frame video{display:block;width:100%}.empty-state{padding:50px 24px;text-align:center}.empty-state svg{width:46px;height:46px;color:var(--muted)}.empty-state h2{margin:12px 0 5px}.empty-state p{margin:0;color:var(--muted)}
.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(390px,.85fr);gap:18px;align-items:stretch}.lab-panel{overflow:hidden}.lab-head{padding:20px;display:flex;justify-content:space-between;gap:15px;align-items:flex-start;border-bottom:1px solid var(--line-soft)}.lab-head h2{margin:0;font-size:23px}.lab-head p{margin:4px 0 0;color:var(--muted);font-size:12px}.lab-select{min-width:230px}.field,select,input,textarea{border:1px solid var(--line);border-radius:11px;background:var(--surface-2);color:var(--text);outline:none}.field:focus,select:focus,input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 12%,transparent)}select,input{min-height:42px;padding:0 12px}.editor{background:#050b0a}.editor-bar{height:44px;display:flex;align-items:center;gap:10px;padding:0 14px;border-bottom:1px solid #18302a;color:#94aea4;font-size:11px}.editor-dots{display:flex;gap:5px}.editor-dots i{width:8px;height:8px;border-radius:50%;background:#36534a}.editor-dots i:first-child{background:#ff7380}.editor-dots i:nth-child(2){background:#ffd166}.editor-dots i:nth-child(3){background:#5cf2bd}.editor-meta{margin-left:auto}.editor-wrap{display:grid;grid-template-columns:52px minmax(0,1fr);height:560px}.line-nums{padding:15px 10px;overflow:hidden;border-right:1px solid #18302a;color:#42665a;text-align:right;font:12px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre}.code-input{width:100%;height:100%;resize:none;padding:15px;border:0;border-radius:0;background:#050b0a;color:#dfffee;font:12px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:2}.editor-actions{padding:13px 15px;display:flex;flex-wrap:wrap;gap:8px;border-top:1px solid #18302a;background:#08110f}.preview-shell{height:648px;background:#030706}.preview-shell iframe{width:100%;height:100%;border:0;background:#fff}.preview-placeholder{height:100%;display:grid;place-items:center;padding:30px;color:#729186;text-align:center}.lab-fullscreen{position:fixed!important;inset:12px!important;z-index:200!important;display:grid!important;grid-template-columns:1fr 1fr!important;background:var(--bg);border:1px solid var(--line);border-radius:20px;box-shadow:0 30px 100px rgba(0,0,0,.55);overflow:auto}.fullscreen-backdrop{position:fixed;inset:0;z-index:190;background:rgba(0,0,0,.7);backdrop-filter:blur(8px)}
.footer{margin-top:18px;padding:28px;display:flex;justify-content:space-between;gap:30px;align-items:flex-end}.footer h2{margin:0;font-size:24px}.footer p{max-width:680px;margin:8px 0 0;color:var(--muted)}.socials{display:flex;flex-wrap:wrap;gap:8px}.socials a{padding:8px 10px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--text-soft);font-size:12px}
.mobile-nav{display:none}.drawer-scrim{display:none}.modal-layer{position:fixed;inset:0;z-index:300;display:grid;place-items:center;padding:18px;background:rgba(2,8,7,.78);backdrop-filter:blur(10px)}.modal-layer.hidden{display:none}.modal{position:relative;width:min(100%,480px);max-height:min(90vh,760px);overflow:auto;padding:27px;border:1px solid var(--line);border-radius:22px;background:var(--surface);box-shadow:0 28px 90px rgba(0,0,0,.5)}.modal.wide{width:min(100%,620px)}.modal-close{position:absolute;right:15px;top:15px;width:38px;height:38px;border:1px solid var(--line);border-radius:11px;background:var(--surface-2);color:var(--text);font-size:22px}.modal h2{margin:0 42px 7px 0;font-size:28px;letter-spacing:-.04em}.modal-copy{margin:0 0 20px;color:var(--muted)}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-bottom:18px;padding:5px;border:1px solid var(--line-soft);border-radius:13px;background:var(--surface-2)}.tabs button{min-height:38px;border:0;border-radius:9px;background:transparent;color:var(--muted);font-weight:750}.tabs button.active{background:var(--surface);color:var(--text);box-shadow:0 4px 14px rgba(0,0,0,.12)}.form-grid{display:grid;gap:13px}.form-grid label{display:grid;gap:6px;color:var(--text-soft);font-size:12px;font-weight:720}.form-grid input{width:100%}.form-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.text-btn{border:0;background:transparent;color:var(--accent);font-weight:750;padding:8px 0}.form-message{min-height:22px;margin:12px 0 0;color:var(--muted);font-size:12px}.form-message.error{color:var(--danger)}.form-message.success{color:var(--success)}.access-price{font-size:34px;font-weight:900;letter-spacing:-.04em}.access-note{padding:12px;border:1px solid var(--line-soft);border-radius:12px;background:var(--surface-2);color:var(--muted);font-size:12px}
.toast-region{position:fixed;right:18px;bottom:18px;z-index:500;display:grid;gap:8px;width:min(360px,calc(100vw - 36px))}.toast{display:flex;align-items:flex-start;gap:10px;padding:13px 14px;border:1px solid var(--line);border-radius:13px;background:var(--surface);box-shadow:var(--shadow);color:var(--text-soft);animation:toastIn .18s ease}.toast i{width:8px;height:8px;margin-top:7px;border-radius:50%;background:var(--success)}.toast.error i{background:var(--danger)}.toast button{margin-left:auto;border:0;background:transparent;color:var(--muted)}@keyframes toastIn{from{opacity:0;transform:translateY(8px)}}
.lesson-mobile-open{display:none}.loading-cover{position:absolute;inset:0;z-index:20;display:grid;place-items:center;background:color-mix(in srgb,var(--surface) 85%,transparent);backdrop-filter:blur(4px)}.spinner{width:30px;height:30px;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:1180px){.dashboard-grid{grid-template-columns:1fr}.side-summary{display:grid;grid-template-columns:1fr 1fr}.notice{grid-column:1/-1}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-layout{grid-template-columns:1fr}.preview-shell{height:560px}.lab-fullscreen{grid-template-columns:1fr!important}}
@media(max-width:900px){:root{--header-h:64px}.topbar{padding:0 12px}.brand{min-width:0;flex:1}.brand-copy span{display:none}.topbar-center{display:none}.account-label{display:none}.account-icon{display:grid}.account-btn{width:42px;padding:0;place-items:center}.side-nav{display:none}.main{padding:calc(var(--header-h) + 15px) 12px 94px}.hero{min-height:0;padding:28px;grid-template-columns:1fr}.hero-visual{display:none}.learning-layout{grid-template-columns:1fr}.lesson-sidebar{position:fixed;left:0;top:0;bottom:0;z-index:240;width:min(88vw,340px);max-height:none;border-radius:0;transform:translateX(-105%);transition:.22s}.lesson-sidebar.open{transform:none}.drawer-scrim{position:fixed;inset:0;z-index:230;background:rgba(0,0,0,.58);backdrop-filter:blur(5px)}.drawer-scrim.show{display:block}.mobile-nav{position:fixed;left:12px;right:12px;bottom:max(12px,env(safe-area-inset-bottom));z-index:100;display:grid;grid-template-columns:repeat(3,1fr);padding:7px;border:1px solid var(--line);border-radius:18px;background:color-mix(in srgb,var(--surface) 91%,transparent);box-shadow:0 20px 55px rgba(0,0,0,.34);backdrop-filter:blur(18px)}.mobile-nav button{min-height:52px;border:0;border-radius:13px;background:transparent;color:var(--muted);font-size:10px;font-weight:800}.mobile-nav button svg{display:block;width:20px;height:20px;margin:0 auto 3px}.mobile-nav button.active{background:color-mix(in srgb,var(--accent) 10%,var(--surface-2));color:var(--text)}.lesson-mobile-open{display:inline-flex}.lab-fullscreen{inset:0!important;border-radius:0}.editor-wrap{height:460px}.preview-shell{height:500px}}
@media(max-width:650px){.hero{padding:24px 20px}.hero h1{font-size:42px}.hero-actions>*{flex:1}.course-grid{grid-template-columns:1fr}.side-summary{display:flex}.section-panel,.side-summary{padding:18px}.section-heading{align-items:flex-start;flex-direction:column}.lesson-hero{padding:22px 18px}.lesson-hero-top{display:block}.lesson-actions{margin-top:16px}.content-block .block-head{padding:15px}.block-body{padding:0 15px 18px}.lab-head{display:block;padding:17px}.lab-select{width:100%;margin-top:12px}.editor-wrap{grid-template-columns:42px;height:430px}.preview-shell{height:470px}.footer{display:block;padding:22px}.socials{margin-top:18px}.modal{padding:23px 18px}.toast-region{bottom:92px}.metric-stack{grid-template-columns:1fr 1fr}}