:root{--ink:#10234c;--blue:#246bfe;--lime:#a5d83d;--mist:#eaf1fe;--line:#d9e3f2;--muted:#61708a;--white:#fff;--red:#c2415a;--green:#177245}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:#f7f9fd;color:var(--ink);font:15px/1.55 Inter,ui-sans-serif,system-ui,-apple-system,sans-serif}button,input{font:inherit}button{cursor:pointer}.topbar{height:72px;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(18px,4vw,54px);position:sticky;top:0;z-index:20}.wordmark{color:#fff;text-decoration:none;font-weight:800;letter-spacing:-.03em}.wordmark span,.brand-mark{display:inline-grid;place-items:center;width:32px;height:32px;background:var(--lime);color:var(--ink);border-radius:8px;margin-right:9px;font-weight:900}.top-actions{display:flex;align-items:center;gap:15px}.user-label{font-size:13px;color:#cbd7ec}.app-layout{display:grid;grid-template-columns:280px minmax(0,1fr);min-height:calc(100vh - 72px)}.sidebar{background:#fff;border-right:1px solid var(--line);padding:28px 16px;position:sticky;top:72px;height:calc(100vh - 72px);overflow:auto}.sidebar-label,.eyebrow{font-size:11px;letter-spacing:.14em;font-weight:900;color:var(--blue)}.sidebar-label{padding:0 12px 13px;color:var(--muted)}.nav-item{width:100%;display:flex;gap:11px;text-align:left;border:0;background:transparent;padding:12px;border-radius:10px;color:var(--ink);margin-bottom:3px}.nav-item:hover,.nav-item.active{background:var(--mist)}.nav-item.active{box-shadow:inset 3px 0 var(--blue)}.nav-number{font-size:11px;font-weight:900;color:var(--blue);padding-top:2px}.nav-item strong{display:block;font-size:13px}.nav-item small{display:block;color:var(--muted);font-size:11px;margin-top:2px}.sidebar-admin{border:0;background:var(--ink);color:#fff;width:100%;border-radius:8px;padding:11px;margin-top:18px;font-weight:800}.main-view{max-width:1200px;width:100%;margin:0 auto;padding:48px clamp(20px,5vw,72px) 90px}.page-head{max-width:810px}.page-head h1,.lesson-head h1{font-size:clamp(34px,5vw,62px);line-height:1.03;letter-spacing:-.055em;margin:8px 0 14px}.lead{font-size:18px;color:var(--muted);max-width:750px}.progress-wrap{margin-top:28px;max-width:530px}.progress-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px;margin-bottom:8px}.progress-meta strong{color:var(--ink)}.progress-track{height:8px;background:#dce6f4;border-radius:99px;overflow:hidden}.progress-track i{display:block;height:100%;background:var(--blue);border-radius:99px}.hero-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:22px;margin:42px 0 58px}.hero-copy{background:var(--ink);color:#fff;border-radius:17px;padding:33px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}.status-label{font-size:10px;letter-spacing:.13em;font-weight:900;color:var(--lime)}.hero-copy h2{font-size:clamp(25px,3vw,38px);line-height:1.08;letter-spacing:-.04em;margin:15px 0}.hero-copy p{color:#c5d1e7}.hero-visual{background:#071126;border-radius:17px;overflow:hidden;min-height:260px;display:grid;place-items:center}.hero-visual img{width:100%;height:100%;object-fit:cover}.button{border:0;border-radius:8px;padding:11px 16px;font-weight:800;transition:transform .18s,box-shadow .18s}.button:hover{transform:translateY(-1px);box-shadow:0 7px 18px rgba(16,35,76,.16)}.button.primary{background:var(--lime);color:var(--ink)}.button.ghost{background:transparent;border:1px solid #526786;color:#fff;padding:8px 12px}.button.small{background:var(--mist);color:var(--ink);padding:8px 11px;font-size:13px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:17px}.section-heading h2{font-size:28px;margin:3px 0}.count{color:var(--muted);font-size:13px}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.lesson-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;display:grid;grid-template-columns:42px 1fr;gap:14px;cursor:pointer;transition:.18s}.lesson-card:hover{transform:translateY(-2px);border-color:#a9c2ed;box-shadow:0 13px 28px rgba(16,35,76,.08)}.lesson-card.done{border-color:#b8dfc9}.lesson-index{font-size:13px;font-weight:900;color:var(--blue)}.lesson-card h3{margin:0 0 7px;font-size:17px;line-height:1.2}.lesson-card p{color:var(--muted);font-size:13px;margin:0 0 15px}.lesson-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.lesson-card.done .lesson-meta span:last-child{color:var(--green);font-weight:800}.lesson-head{max-width:830px;border-bottom:1px solid var(--line);padding-bottom:28px}.back-link{display:inline-block;color:var(--blue);font-weight:800;text-decoration:none;margin-bottom:40px}.lesson-head-meta{display:flex;gap:18px;color:var(--muted);font-size:13px}.lesson-body{background:#fff;border:1px solid var(--line);border-radius:15px;padding:clamp(22px,5vw,48px);margin:28px 0;max-width:900px;box-shadow:0 12px 35px rgba(16,35,76,.04)}.lesson-body h1{font-size:31px;line-height:1.1;border-bottom:1px solid var(--line);padding-bottom:12px}.lesson-body h2{font-size:25px;margin-top:34px}.lesson-body h3{font-size:19px;margin-top:26px}.lesson-body p{color:#33445f}.lesson-body li{margin:7px 0;color:#33445f}.lesson-body pre{background:#101d35;color:#d9e6ff;padding:17px;border-radius:9px;overflow:auto;font-size:13px}.lesson-body code{background:#edf2fb;padding:2px 5px;border-radius:4px;color:#163a7c}.lesson-body pre code{background:transparent;color:inherit;padding:0}.lesson-body blockquote{border-left:4px solid var(--lime);padding:10px 16px;background:#f5f9e9;color:#425426}.table-line{font-family:ui-monospace,monospace;font-size:12px;white-space:pre-wrap;color:#42516b}.completion-box{max-width:900px;background:#eef7e5;border:1px solid #cce6aa;border-radius:12px;padding:16px;display:flex;justify-content:space-between;align-items:center;gap:16px}.completion-box label{font-weight:800}.completion-box input{accent-color:var(--blue);margin-right:7px}.quiz-card,.admin-panel{max-width:900px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:25px;margin-top:25px}.quiz-card h2,.admin-panel h2{margin:5px 0}.quiz-card p{color:var(--muted)}fieldset{border:0;border-top:1px solid var(--line);padding:18px 0 5px;margin-top:13px}legend{font-weight:800;margin-bottom:10px}.option{display:block;padding:9px 11px;border-radius:7px;color:var(--muted)}.option:hover{background:var(--mist);color:var(--ink)}.quiz-result{margin-top:15px;padding:10px;border-radius:7px}.quiz-result.pass{background:#e8f6ed;color:var(--green)}.quiz-result.fail{background:#fff0f1;color:var(--red)}.toast{position:fixed;right:20px;bottom:20px;z-index:50;background:var(--ink);color:#fff;padding:12px 15px;border-radius:8px;opacity:0;transform:translateY(10px);transition:.2s;pointer-events:none}.toast.show{opacity:1;transform:none}.toast.success{border-left:4px solid var(--lime)}.toast.error{border-left:4px solid #ff8091}.auth-view{min-height:100vh;display:grid;grid-template-columns:1fr 1fr;background:var(--ink)}.auth-card{align-self:center;max-width:510px;padding:clamp(30px,7vw,90px);color:#fff}.auth-card h1{font-size:clamp(38px,5vw,66px);line-height:.98;letter-spacing:-.06em;margin:14px 0}.auth-card .lead{color:#c7d4e9}.auth-card label{display:block;font-size:13px;font-weight:800;margin:17px 0}.auth-card input{display:block;width:100%;margin-top:6px;background:#fff;border:0;border-radius:7px;padding:12px;color:var(--ink)}.auth-card .button{width:100%;margin-top:8px}.hint{font-size:12px;color:#98a9c5}.form-error{color:#ff9dac;min-height:20px}.auth-art{display:grid;place-items:center;background:#071126;overflow:hidden}.auth-art img{width:100%;max-width:740px}.admin-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:28px 0}.stat-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px}.stat-card span{display:block;color:var(--muted);font-size:13px}.stat-card strong{font-size:31px}.inline-form{display:flex;gap:10px}.inline-form input{flex:1;border:1px solid var(--line);border-radius:7px;padding:11px}.invite-result{display:grid;gap:8px;background:#eef7e5;padding:14px;margin-top:15px;border-radius:8px}.invite-result code{word-break:break-all}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:13px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:12px 8px}th{color:var(--muted)}
@media(max-width:900px){.app-layout{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:12px 16px;display:flex;flex-wrap:nowrap;align-items:stretch;gap:6px;white-space:normal;overflow-x:auto;overflow-y:hidden}.sidebar-label{display:none}.sidebar #lesson-nav{display:flex;flex:0 0 auto;gap:6px}.nav-item{display:flex;flex:0 0 220px;min-width:220px;width:220px;height:66px;margin:0;white-space:normal}.sidebar-admin{display:block;flex:0 0 145px;min-width:145px;width:145px;height:66px;margin:0;white-space:normal}.hero-grid{grid-template-columns:1fr}.hero-visual{min-height:210px}.lesson-grid{grid-template-columns:1fr}.auth-view{grid-template-columns:1fr}.auth-art{display:none}.auth-card{max-width:none}.topbar{height:64px}.app-layout{min-height:calc(100vh - 64px)}}@media(max-width:560px){.main-view{padding:32px 16px 60px}.topbar{padding:0 14px}.user-label{display:none}.lesson-head h1,.page-head h1{font-size:39px}.completion-box{align-items:stretch;flex-direction:column}.inline-form{flex-direction:column}.admin-grid{grid-template-columns:1fr 1fr}.admin-grid .stat-card:last-child{grid-column:span 2}.hero-copy{padding:25px}.hero-visual{min-height:170px}.lesson-card{padding:17px}}