:root{--bg:#f4f5f7;--card:#fff;--text:#262b33;--muted:#69727d;--primary:#ff6800;--dark:#15171d;--line:#e1e5e9;--success:#149a67}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none;color:inherit}.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.topbar-inner{max-width:1440px;margin:auto;padding:14px 24px;display:flex;gap:16px;align-items:center}.brand{font-weight:900;font-size:20px;display:flex;gap:10px;align-items:center}.brand-dot{width:14px;height:14px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 5px #ff680022}.spacer{flex:1}.btn{border:0;border-radius:9px;padding:10px 14px;font-weight:800;cursor:pointer;display:inline-flex}.btn-primary{background:var(--primary);color:#fff}.btn-light{background:#fff;border:1px solid var(--line)}.btn-danger{background:#b62323;color:#fff}.container{max-width:1440px;margin:auto;padding:26px 24px}.hero{background:linear-gradient(135deg,#121419,#343a46);color:#fff}.hero-inner{max-width:1200px;margin:auto;padding:58px 24px;display:grid;grid-template-columns:1.25fr .75fr;gap:30px;align-items:center}.hero h1{font-size:44px;line-height:1.07;margin:14px 0}.hero p{color:#d9dde4;font-size:18px;line-height:1.55}.hero-card,.card,.course-head,.video-card,.sidebar{background:#fff;border:1px solid var(--line);border-radius:14px}.hero-card{color:var(--text);padding:22px}.badge{display:inline-block;padding:7px 10px;border-radius:999px;background:#ff680022;color:#ff7b24;border:1px solid #ff680055;font-weight:800;font-size:13px}.grid{display:grid;gap:18px}.grid-3{grid-template-columns:repeat(3,1fr)}.card{padding:18px}.course-head{padding:20px;display:grid;grid-template-columns:1fr auto;align-items:center;margin-bottom:20px}.progress-ring{width:96px;height:96px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--primary) calc(var(--progress)*1%),#e8eaed 0)}.progress-center{width:74px;height:74px;border-radius:50%;background:#fff;display:grid;place-items:center;font-weight:900;font-size:21px}.course-layout{display:grid;grid-template-columns:minmax(0,1fr) 390px;gap:22px;align-items:start}.video-card{overflow:hidden}.video-wrap{position:relative;padding-top:56.25%;background:#000}.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.lesson-meta{padding:18px}.sidebar{overflow:hidden;max-height:75vh;position:sticky;top:80px}.module-accordion summary{list-style:none;cursor:pointer}.module-summary{display:flex;justify-content:space-between;padding:15px 16px;background:#eceeef;font-weight:900;border-bottom:1px solid var(--line)}.lesson-row{display:grid;grid-template-columns:28px 1fr auto;gap:10px;align-items:center;padding:13px 14px;border-bottom:1px solid var(--line)}.lesson-row:hover{background:#fff5ee}.lesson-row.active{background:var(--primary);color:#fff}.check{width:20px;height:20px;border:2px solid #c7ccd2;border-radius:5px;display:grid;place-items:center;font-size:12px}.lesson-row.done .check{background:var(--success);border-color:var(--success);color:#fff}.small{font-size:13px;color:var(--muted)}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:25px;background:linear-gradient(145deg,#111318,#333946)}.auth-card{width:min(470px,100%);background:#fff;border-radius:18px;padding:28px}.form-group{display:grid;gap:7px;margin:13px 0}.form-group input,.form-group textarea,.form-group select{padding:12px;border:1px solid #ccd2d8;border-radius:9px;width:100%}.form-group textarea{min-height:100px}.alert{padding:12px;background:#fff0f0;border:1px solid #ffc5c5;border-radius:8px;color:#8b1a1a}.admin-shell{display:grid;grid-template-columns:230px 1fr;min-height:100vh}.admin-nav{background:#171a20;color:#fff;padding:22px}.admin-nav a{display:block;padding:11px;border-radius:8px;color:#d8dde4}.admin-nav a:hover{background:#292e37}.admin-main{padding:28px}.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.stat strong{display:block;font-size:30px}.table-wrap{overflow:auto;background:#fff;border:1px solid var(--line);border-radius:14px}table{width:100%;border-collapse:collapse}th,td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}th{background:#f0f2f4}@media(max-width:960px){.hero-inner,.course-layout,.grid-3,.admin-shell{grid-template-columns:1fr}.sidebar{position:static;max-height:none}.hero h1{font-size:35px}}