:root{--bg:#0b1220;--surface:#111b2e;--surface-2:#17233a;--surface-3:#1d2a42;--text:#f5f3ed;--muted:#a8b2c3;--accent:#a8bbaf;--accent-strong:#c3d3c9;--line:rgba(190,205,226,.13);--danger:#d98989;--shadow:0 24px 70px rgba(0,0,0,.28);--radius:18px;--header:72px}*{box-sizing:border-box}html{background:var(--bg);color-scheme:dark;scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 15% -15%,rgba(72,103,112,.17),transparent 30%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.55;min-height:100vh}img,iframe{display:block;max-width:100%}a{color:inherit;text-decoration:none}button,input{font:inherit}.icon{width:1.1em;height:1.1em;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:Georgia,"Times New Roman",serif;letter-spacing:-.025em;line-height:1.12}h1{font-size:clamp(2rem,5vw,3.45rem);margin-bottom:.8rem}h2{font-size:clamp(1.45rem,3vw,2.1rem)}h3{font-size:1.25rem}.eyebrow{color:var(--accent);font-size:.76rem;font-weight:750;letter-spacing:.16em}.container{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:34px 0 112px}.app-header{height:var(--header);position:sticky;top:0;z-index:40;display:flex;align-items:center;padding:0 max(22px,calc((100vw - 1180px)/2));background:rgba(11,18,32,.88);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}.brand{display:flex;align-items:center;gap:11px;margin-right:auto}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid rgba(168,187,175,.42);border-radius:50%;font:italic 1.25rem Georgia;color:var(--accent-strong);background:linear-gradient(145deg,rgba(168,187,175,.14),rgba(255,255,255,.02));box-shadow:inset 0 0 0 5px var(--bg)}.brand span:last-child{display:flex;flex-direction:column;line-height:1.08}.brand strong{font-family:Georgia,serif;font-size:.95rem;font-weight:500}.brand small{color:var(--muted);font-size:.67rem;letter-spacing:.06em}.desktop-nav{display:flex;align-self:stretch}.desktop-nav a{display:flex;align-items:center;gap:7px;padding:0 18px;color:var(--muted);font-size:.9rem;position:relative}.desktop-nav a .icon{display:none}.desktop-nav a:hover,.desktop-nav a.active{color:var(--text)}.desktop-nav a.active:after{content:"";position:absolute;bottom:-1px;left:18px;right:18px;height:2px;background:var(--accent);border-radius:2px}.profile{position:relative;margin-left:20px}.profile-button{border:0;background:transparent;color:var(--text);display:flex;align-items:center;gap:9px;cursor:pointer;padding:8px}.profile-button>span:first-child{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--surface-3);border:1px solid var(--line);color:var(--accent);font-weight:700}.profile-button .icon{color:var(--muted);width:14px}.profile-email{font-size:.8rem;max-width:150px;overflow:hidden;text-overflow:ellipsis}.profile-menu{display:none;position:absolute;right:0;top:52px;width:235px;padding:12px;background:var(--surface-2);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.profile-menu.open{display:block}.profile-menu strong{display:block;overflow:hidden;text-overflow:ellipsis;padding:8px;color:var(--muted);font-size:.8rem}.profile-menu button{display:flex;align-items:center;gap:8px;width:100%;border:0;border-radius:9px;padding:11px;background:transparent;color:var(--text);cursor:pointer}.profile-menu button:hover{background:var(--surface-3)}.mobile-nav{display:none}.button{min-height:48px;border-radius:11px;padding:0 20px;display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid transparent;font-size:.8rem;font-weight:780;letter-spacing:.08em;cursor:pointer;transition:.18s ease}.button:hover{transform:translateY(-1px)}.button.primary{background:var(--accent);color:#0b1513;box-shadow:0 12px 30px rgba(108,139,121,.16)}.button.primary:hover{background:var(--accent-strong)}.button.secondary{border-color:rgba(168,187,175,.3);background:rgba(168,187,175,.08);color:var(--accent-strong)}.button.ghost{border-color:var(--line);background:var(--surface);color:var(--muted)}.button.complete{border-color:rgba(168,187,175,.3);background:rgba(168,187,175,.08);color:var(--accent-strong)}.button.complete.is-complete{background:var(--accent);color:#0b1513}.button.danger{background:var(--danger);color:#241010}.button.wide{width:100%}.button.disabled{opacity:.35;pointer-events:none}.welcome{padding:18px 0 20px}.welcome h1{margin:.3rem 0}.welcome p,.page-heading p{color:var(--muted);max-width:620px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin:34px 0 17px}.section-heading h2{margin:.25rem 0 0}.section-heading>a{color:var(--accent);font-size:.85rem;display:flex;align-items:center;gap:7px;white-space:nowrap}.continue-card{display:grid;grid-template-columns:minmax(300px,47%) 1fr;overflow:hidden;border:1px solid var(--line);border-radius:22px;background:linear-gradient(135deg,var(--surface-2),var(--surface));box-shadow:var(--shadow)}.continue-cover{width:100%;height:100%;min-height:320px;object-fit:cover}.continue-body{padding:36px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.continue-body h2{font-size:clamp(1.75rem,3.5vw,2.65rem);margin:.5rem 0 1rem}.continue-body p{color:var(--muted);max-width:580px}.continue-meta{display:flex;gap:18px;margin:6px 0 22px;color:var(--muted);font-size:.83rem}.continue-meta span{display:flex;align-items:center;gap:6px}.progress-summary{margin:28px 0 50px;padding:24px 28px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:30px}.big-progress{display:flex;align-items:baseline;gap:20px;margin-top:5px}.big-progress strong{font:2.6rem Georgia;color:var(--accent-strong)}.big-progress strong small{font-size:1rem}.big-progress span{color:var(--muted)}.progress-track{height:7px;background:rgba(255,255,255,.07);border-radius:9px;overflow:hidden}.progress-track span{display:block;height:100%;background:linear-gradient(90deg,#809b8c,var(--accent-strong));border-radius:inherit}.progress-summary>div:last-child>a{display:flex;align-items:center;justify-content:flex-end;gap:6px;color:var(--accent);font-size:.82rem;margin-top:12px}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.module-card{min-width:0;border-radius:var(--radius);overflow:hidden;background:var(--surface);border:1px solid var(--line);transition:.2s ease}.module-card:hover{transform:translateY(-3px);border-color:rgba(168,187,175,.28)}.module-card img{width:100%;aspect-ratio:16/9;object-fit:cover}.module-card>div{padding:18px}.module-card h3{margin:.45rem 0 .7rem}.module-card p{color:var(--muted);font-size:.8rem;margin-bottom:12px}.material-preview{display:grid;grid-template-columns:1fr 1fr;gap:14px}.material-preview>a{display:flex;align-items:center;gap:15px;padding:20px;border:1px solid var(--line);border-radius:15px;background:var(--surface)}.material-preview>a>.icon:first-child{width:27px;height:27px;color:var(--accent)}.material-preview>a>.icon:last-child{margin-left:auto;color:var(--muted)}.material-preview span{display:flex;flex-direction:column}.material-preview small{color:var(--muted);margin-top:3px}.disclaimer{display:flex;gap:12px;color:var(--muted);border-top:1px solid var(--line);padding:24px 0;margin-top:40px;font-size:.83rem}.disclaimer p{margin:0}.disclaimer .icon{color:var(--accent);margin-top:2px}.disclaimer.compact{border:0;background:rgba(255,255,255,.025);padding:14px;border-radius:12px;margin-top:22px}.course-layout{display:grid;grid-template-columns:350px 1fr;gap:40px;align-items:start}.course-intro{position:sticky;top:calc(var(--header) + 28px);padding:18px 0}.course-intro h1{font-size:2.7rem;margin-top:.6rem}.course-intro>p{color:var(--muted)}.course-facts{display:flex;gap:18px;color:var(--muted);font-size:.84rem;margin:24px 0}.course-facts span{display:flex;align-items:center;gap:6px}.course-progress{margin:22px 0}.course-progress>div:first-child{display:flex;justify-content:space-between;margin-bottom:10px;font-size:.85rem}.course-progress strong{color:var(--accent)}.module-list{display:flex;flex-direction:column;gap:12px}.page-title-mobile{margin:10px 0 4px}.module-accordion{background:var(--surface);border:1px solid var(--line);border-radius:15px;overflow:hidden}.module-accordion summary{list-style:none;display:grid;grid-template-columns:46px 1fr 140px;align-items:center;gap:16px;padding:21px;cursor:pointer}.module-accordion summary::-webkit-details-marker{display:none}.module-number{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:rgba(168,187,175,.09);color:var(--accent);font:1.05rem Georgia}.module-accordion summary>span:nth-child(2){display:flex;flex-direction:column}.module-accordion summary small{font-size:.66rem;color:var(--accent);letter-spacing:.12em}.module-accordion summary strong{font-family:Georgia;font-size:1.12rem;margin:3px 0}.module-accordion summary em{font-style:normal;color:var(--muted);font-size:.75rem}.summary-progress{display:flex;align-items:center;gap:14px}.summary-progress .progress-track{width:92px}.summary-progress>.icon{transition:.2s}.module-accordion[open] .summary-progress>.icon{transform:rotate(180deg)}.accordion-lessons{border-top:1px solid var(--line)}.lesson-row{display:grid;grid-template-columns:36px 1fr auto;align-items:center;gap:12px;padding:15px 20px;border-bottom:1px solid rgba(190,205,226,.08)}.lesson-row:last-child{border-bottom:0}.lesson-row:hover{background:rgba(255,255,255,.025)}.lesson-status{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;border:1px solid var(--line);color:var(--accent)}.lesson-row.completed .lesson-status{background:var(--accent);color:#102018}.lesson-copy{display:flex;flex-direction:column;min-width:0}.lesson-copy small{color:var(--muted);font-size:.7rem}.lesson-copy strong{font-size:.88rem;overflow:hidden;text-overflow:ellipsis}.lesson-meta{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:.72rem}.lesson-meta span{display:flex;align-items:center;gap:4px}.lesson-container{width:min(1380px,calc(100% - 32px))}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 365px;gap:28px}.video-shell{position:relative;aspect-ratio:16/9;background:#05080e;border:1px solid var(--line);border-radius:17px;overflow:hidden;box-shadow:var(--shadow)}.video-shell iframe{width:100%;height:100%;border:0}.video-fallback{display:none;position:absolute;inset:0;background:rgba(5,8,14,.94);align-items:center;justify-content:center;flex-direction:column;gap:15px;text-align:center;padding:24px}.video-fallback.is-visible{display:flex}.breadcrumb{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:.78rem;margin:24px 0 18px}.breadcrumb a:hover{color:var(--accent)}.lesson-main h1{font-size:clamp(2rem,4vw,3rem);margin:.5rem 0 .9rem}.lesson-description{color:var(--muted);font-size:1.06rem;max-width:800px}.learning-points{padding:22px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:26px 0}.learning-points h2{font-size:1.35rem;margin-bottom:14px}.learning-points ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:10px 24px}.learning-points li{display:flex;align-items:flex-start;gap:9px;color:var(--muted)}.learning-points li .icon{color:var(--accent);margin-top:4px}.source-credit{display:flex;justify-content:space-between;color:var(--muted);font-size:.83rem}.source-credit a{color:var(--accent);display:flex;align-items:center;gap:6px}.lesson-actions{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;margin-top:28px}.lesson-actions>a:last-child{justify-self:end}.playlist{position:sticky;top:calc(var(--header) + 20px);max-height:calc(100vh - var(--header) - 40px);overflow:auto;background:var(--surface);border:1px solid var(--line);border-radius:17px}.playlist-head{padding:22px;border-bottom:1px solid var(--line)}.playlist-head h2{font-size:1.4rem;margin:.4rem 0 .8rem}.playlist-head>span:not(.eyebrow){color:var(--muted);font-size:.76rem}.playlist-head .progress-track{margin-top:11px}.playlist .lesson-row{padding:13px 16px}.page-heading{padding:24px 0 18px}.page-heading h1{margin:.4rem 0 .7rem}.materials-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.material-card{padding:28px;background:linear-gradient(145deg,var(--surface-2),var(--surface));border:1px solid var(--line);border-radius:var(--radius)}.material-icon{width:50px;height:50px;display:grid;place-items:center;border-radius:14px;background:rgba(168,187,175,.1);color:var(--accent);margin-bottom:28px}.material-icon .icon{width:26px;height:26px}.material-card h2{margin:.6rem 0}.material-card p{color:var(--muted);min-height:52px}.material-card .button{margin-top:10px}.progress-hero{display:grid;grid-template-columns:210px 1fr;gap:46px;align-items:center;padding:32px;background:linear-gradient(135deg,var(--surface-2),var(--surface));border:1px solid var(--line);border-radius:22px}.progress-ring{width:190px;aspect-ratio:1;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--accent) calc(var(--value)*1%),rgba(255,255,255,.07) 0);position:relative}.progress-ring:before{content:"";position:absolute;inset:12px;background:var(--surface-2);border-radius:50%}.progress-ring span{position:relative;text-align:center;display:flex;flex-direction:column}.progress-ring strong{font:2.5rem Georgia;color:var(--accent-strong)}.progress-ring small{color:var(--muted)}.progress-hero>div:last-child h2{margin-bottom:.4rem}.progress-hero>div:last-child p{color:var(--muted)}.progress-hero>div:last-child>.progress-track{max-width:480px;margin:20px 0}.progress-modules{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.progress-modules>a{display:grid;grid-template-columns:52px 1fr 50px 20px;align-items:center;gap:16px;padding:19px 22px;background:var(--surface);border-bottom:1px solid var(--line)}.progress-modules>a:last-child{border:0}.progress-modules>a>span:nth-child(2){display:grid;grid-template-columns:1fr auto;gap:4px 14px}.progress-modules strong{font-family:Georgia}.progress-modules small{color:var(--muted)}.progress-modules .progress-track{grid-column:1/3;margin-top:5px}.progress-modules em{font-style:normal;color:var(--accent);font-size:.85rem}.last-activity{display:flex;justify-content:space-between;align-items:center;margin-top:28px;padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.last-activity>div{display:flex;align-items:center;gap:13px}.last-activity>div>.icon{width:25px;height:25px;color:var(--accent)}.last-activity span{display:flex;flex-direction:column}.last-activity small{color:var(--muted);font-size:.68rem;letter-spacing:.12em}.last-activity>a{color:var(--accent);display:flex;gap:7px;align-items:center}.reset-area{text-align:center;margin:34px}.reset-area button{border:0;background:transparent;color:#8f99a9;text-decoration:underline;cursor:pointer;font-size:.78rem}dialog{width:min(440px,calc(100% - 32px));border:1px solid var(--line);border-radius:19px;background:var(--surface-2);color:var(--text);padding:0;box-shadow:var(--shadow)}dialog::backdrop{background:rgba(3,7,14,.75);backdrop-filter:blur(4px)}dialog form{padding:30px;text-align:center}.dialog-icon{margin:auto;width:50px;height:50px;border-radius:50%;display:grid;place-items:center;background:rgba(217,137,137,.1);color:var(--danger)}dialog h2{margin:18px 0 9px}dialog p{color:var(--muted)}dialog form>div{display:flex;gap:10px;justify-content:center;margin-top:24px}.login-page{overflow-x:hidden}.login-layout{min-height:100svh;display:grid;grid-template-columns:1.15fr .85fr}.login-visual{position:relative;overflow:hidden;background:radial-gradient(circle at 48% 40%,rgba(168,187,175,.14),transparent 30%),linear-gradient(145deg,#0e192a,#09101c);border-right:1px solid var(--line)}.orbital-art{position:absolute;left:50%;top:45%;width:min(58vw,700px);aspect-ratio:1;transform:translate(-50%,-50%)}.orbital-art:before,.orbital-art:after{content:"";position:absolute;inset:14%;border:1px solid rgba(168,187,175,.22);border-radius:48% 52% 55% 45%;transform:rotate(28deg)}.orbital-art:after{inset:26%;transform:rotate(-24deg);border-color:rgba(168,187,175,.12)}.orbital-art span{position:absolute;width:14px;height:14px;border-radius:50%;background:var(--accent);box-shadow:0 0 35px rgba(168,187,175,.8)}.orbital-art span:nth-child(1){left:17%;top:42%}.orbital-art span:nth-child(2){right:18%;top:24%}.orbital-art span:nth-child(3){right:25%;bottom:17%}.orbital-art span:nth-child(4){left:30%;bottom:25%}.orbital-art i{position:absolute;left:43%;top:38%;width:90px;height:140px;border-radius:50% 50% 35% 35%;background:linear-gradient(rgba(168,187,175,.23),rgba(168,187,175,.02));filter:blur(4px)}.login-quote{position:absolute;left:9%;bottom:7%;max-width:420px}.login-quote p{font:clamp(1.4rem,2.4vw,2.1rem)/1.25 Georgia;margin-bottom:15px}.login-quote span{color:var(--muted);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase}.login-panel{display:grid;place-items:center;padding:40px;background:var(--bg)}.login-card{width:min(100%,430px)}.login-brand{margin-bottom:clamp(50px,9vh,100px)}.login-card h1{margin:.6rem 0}.login-card>div>p{color:var(--muted);margin-bottom:30px}.login-card form{display:flex;flex-direction:column}.login-card label{font-size:.82rem;font-weight:650;margin:0 0 7px}.input-wrap{height:54px;display:flex;align-items:center;gap:10px;padding:0 15px;border:1px solid var(--line);border-radius:11px;background:var(--surface);margin-bottom:17px}.input-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(168,187,175,.1)}.input-wrap .icon{color:var(--muted)}.input-wrap input{width:100%;height:100%;border:0;outline:0;background:transparent;color:var(--text);font-size:16px}.input-wrap input::placeholder{color:#657187}.form-error{color:#e8a4a4;font-size:.8rem;min-height:20px;margin:-5px 0 10px}.login-note{display:flex;justify-content:center;align-items:center;gap:7px;color:#728096;font-size:.72rem;margin-top:20px}.error-page{min-height:100vh;display:grid;place-content:center;justify-items:center;text-align:center;padding:24px}.error-page .brand-mark{margin-bottom:28px}.error-page h1{margin:.7rem 0}.error-page p{color:var(--muted)}:focus-visible{outline:3px solid rgba(195,211,201,.72);outline-offset:3px}
@media(max-width:900px){.desktop-nav{display:none}.profile-email{display:none}.profile{margin-left:8px}.container{padding-top:25px}.module-grid{grid-template-columns:repeat(2,1fr)}.course-layout{grid-template-columns:1fr}.course-intro{position:static}.lesson-layout{grid-template-columns:1fr}.playlist{position:static;max-height:none}.login-layout{grid-template-columns:1fr}.login-visual{display:none}.login-panel{padding:30px 22px}.login-brand{margin-bottom:60px}.lesson-actions{grid-template-columns:1fr 1fr}.lesson-actions .complete{grid-column:1/3;grid-row:1}.materials-grid{grid-template-columns:1fr 1fr}}
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