:root{
  --blue:#173b86;--blue2:#2368b4;--gold:#d5a23b;--ink:#17213a;--muted:#687386;
  --bg:#f6f8fc;--card:#fff;--line:#e5e9f1;--ok:#19875f;--danger:#b7323b;--warn:#a66d11;
  --shadow:0 18px 50px rgba(21,41,83,.08);--radius:22px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Tahoma,Arial,sans-serif;background:var(--bg);color:var(--ink)}
button,input,select,textarea{font:inherit}button{cursor:pointer}
a{text-decoration:none;color:inherit}.hidden{display:none!important}
.shell{min-height:100vh}.wrap{width:min(1180px,calc(100% - 28px));margin:auto}
.topbar{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav{height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}.brand img{width:46px;height:46px;object-fit:contain;border-radius:14px}.brand b{display:block;color:var(--blue);font-size:17px}.brand small{display:block;color:#8791a2;font-size:8px;letter-spacing:1px}
.navlinks{display:flex;align-items:center;gap:17px;color:#536076;font-size:12px}.navlinks a:hover{color:var(--blue)}
.navActions{display:flex;gap:8px;align-items:center}.btn{border:0;border-radius:13px;padding:11px 15px;font-weight:800;transition:.15s}
.btn.primary{background:linear-gradient(135deg,var(--blue),var(--blue2));color:#fff;box-shadow:0 10px 25px rgba(23,59,134,.15)}
.btn.secondary{background:#eef3ff;color:var(--blue)}.btn.ghost{background:white;color:var(--blue);border:1px solid #d8e0ef}
.btn.ok{background:#e8f7f1;color:var(--ok)}.btn.danger{background:#fff0f1;color:var(--danger)}.btn.warn{background:#fff5df;color:var(--warn)}
.btn.small{padding:8px 10px;font-size:10px}.btn.full{width:100%}.btn:disabled{opacity:.55;cursor:not-allowed}
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#fffdfa,#fff);padding:72px 0 56px}
.hero:before,.hero:after{content:"";position:absolute;border-radius:50%;filter:blur(2px);opacity:.22}
.hero:before{width:520px;height:520px;background:radial-gradient(circle,#ff9b3b,transparent 68%);right:-190px;top:-280px}
.hero:after{width:560px;height:560px;background:radial-gradient(circle,#3e9fd7,transparent 68%);left:-220px;bottom:-330px}
.heroGrid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;position:relative}
.eyebrow{font-size:9px;letter-spacing:1.8px;font-weight:900;color:var(--gold)}
.hero h1{font-size:clamp(44px,7vw,76px);line-height:1.03;letter-spacing:-2px;margin:12px 0 18px}.hero h1 em{font-style:normal;color:var(--blue)}
.hero p{color:var(--muted);line-height:1.9;max-width:680px}.heroActions{display:flex;gap:9px;flex-wrap:wrap;margin-top:22px}
.heroStats{display:flex;gap:24px;margin-top:30px}.heroStats b{display:block;color:var(--blue);font-size:23px}.heroStats span{font-size:9px;color:#8994a6}
.heroLogo{background:white;border:1px solid #eee7dc;border-radius:32px;padding:25px;box-shadow:0 34px 80px rgba(35,55,90,.12);text-align:center}
.heroLogo img{width:100%;height:320px;object-fit:contain}.heroLogo .slogan{color:var(--blue);font-weight:900;font-size:18px}
.section{padding:58px 0}.section.alt{background:#fff}.sectionHead{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px}.sectionHead h2{font-size:34px;margin:5px 0}.sectionHead p{max-width:520px;font-size:12px;color:var(--muted);line-height:1.8}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:19px;box-shadow:0 8px 30px rgba(27,42,75,.04)}
.teacherCard{display:flex;gap:14px;align-items:flex-start}.avatar{width:56px;height:56px;border-radius:17px;background:linear-gradient(135deg,#eaf1ff,#fff4d9);display:grid;place-items:center;color:var(--blue);font-weight:900;font-size:21px;flex:0 0 auto}
.teacherCard h3,.courseCard h3{margin:4px 0 7px}.teacherCard p,.courseCard p{font-size:11px;color:var(--muted);line-height:1.7}.meta{font-size:9px;color:var(--gold);font-weight:900}
.courseCard{display:flex;flex-direction:column;min-height:210px}.courseCard .foot{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:auto}.price{font-weight:900;color:var(--blue)}
.roleGrid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.roleCard{border:1px solid var(--line);background:white;border-radius:22px;padding:19px;text-align:right;transition:.16s}.roleCard:hover{transform:translateY(-3px);border-color:#c9d5ed}.roleCard span{font-size:9px;color:var(--gold);font-weight:900}.roleCard h3{font-size:21px;margin:10px 0 7px}.roleCard p{font-size:11px;color:var(--muted);line-height:1.7}
.authPage{min-height:100vh;display:grid;place-items:center;padding:25px;background:radial-gradient(circle at 80% 10%,#fff0d7,transparent 28%),radial-gradient(circle at 10% 90%,#e5f2ff,transparent 30%),var(--bg)}
.authCard{width:min(520px,100%);background:white;border:1px solid var(--line);border-radius:28px;padding:25px;box-shadow:var(--shadow)}.authBrand{text-align:center;margin-bottom:18px}.authBrand img{height:110px;max-width:280px;object-fit:contain}.authBrand h1{font-size:22px;margin:4px}.authBrand p{font-size:11px;color:var(--muted)}
.formGrid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.field{display:grid;gap:6px}.field.full{grid-column:1/-1}.field label{font-size:10px;color:#687386;font-weight:800}
.input,.select,.textarea{width:100%;border:1px solid #dfe4ed;background:white;border-radius:12px;padding:11px 12px;outline:0;color:var(--ink)}.input:focus,.select:focus,.textarea:focus{border-color:#92abd9;box-shadow:0 0 0 3px #edf3ff}.textarea{min-height:95px;resize:vertical}
.help{font-size:9px;color:#8992a2;line-height:1.6}.authFoot{text-align:center;font-size:10px;color:var(--muted);margin-top:13px}.authFoot a{color:var(--blue);font-weight:800}
.dashboard{min-height:100vh}.dashLayout{display:grid;grid-template-columns:230px 1fr;min-height:calc(100vh - 68px)}.sidebar{background:#111b31;color:#dfe8ff;padding:16px;position:sticky;top:68px;height:calc(100vh - 68px);overflow:auto}.sideTitle{font-size:9px;color:#8393b5;letter-spacing:1.4px;margin:5px 8px 12px}.sideBtn{width:100%;text-align:right;border:0;background:transparent;color:#c9d4eb;border-radius:11px;padding:11px 12px;margin:2px 0;font-size:11px;font-weight:700}.sideBtn.active,.sideBtn:hover{background:#1f3155;color:#fff}.dashMain{padding:22px;overflow:hidden}.dashHead{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:18px}.dashHead h1{font-size:25px;margin:0}.dashHead p{font-size:10px;color:var(--muted);margin:4px 0}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.metric{background:white;border:1px solid var(--line);border-radius:18px;padding:16px}.metric span{font-size:9px;color:#8290a1}.metric b{display:block;font-size:22px;color:var(--blue);margin-top:6px}.panel{background:white;border:1px solid var(--line);border-radius:20px;padding:17px;margin-top:14px;overflow:hidden}.panelHead{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px}.panelHead h3{margin:0;font-size:16px}.panelHead p{font-size:9px;color:var(--muted);margin:0}
.tableWrap{overflow:auto}.table{width:100%;border-collapse:collapse;min-width:700px}.table th,.table td{padding:10px;border-bottom:1px solid #edf0f5;text-align:right;font-size:10px;vertical-align:top}.table th{color:#7a8699;background:#fafbfc;position:sticky;top:0}.table tr:last-child td{border-bottom:0}
.list{display:grid;gap:9px}.listItem{border:1px solid #edf0f5;border-radius:14px;padding:12px;display:flex;justify-content:space-between;align-items:center;gap:12px}.listItem h4{margin:0 0 4px;font-size:12px}.listItem p{margin:0;font-size:9px;color:var(--muted);line-height:1.6}.actions{display:flex;gap:6px;flex-wrap:wrap}
.badge{display:inline-flex;align-items:center;padding:5px 8px;border-radius:999px;font-size:9px;font-weight:900;background:#edf3ff;color:var(--blue)}.badge.ok{background:#e8f7f1;color:var(--ok)}.badge.warn{background:#fff4df;color:var(--warn)}.badge.danger{background:#fff0f1;color:var(--danger)}
.empty{text-align:center;padding:35px;color:#8993a3;font-size:11px}.split{display:grid;grid-template-columns:1fr 1fr;gap:14px}.stack{display:grid;gap:10px}
.modal{position:fixed;inset:0;z-index:120;background:rgba(10,18,38,.68);backdrop-filter:blur(5px);display:grid;place-items:center;padding:18px}.modalBox{width:min(720px,100%);max-height:92vh;overflow:auto;background:white;border-radius:24px;border:1px solid var(--line);padding:20px}.modalHead{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.modalHead h3{margin:0}.iconBtn{border:1px solid #dfe4ed;background:white;border-radius:10px;padding:7px 10px}
.question{border:1px solid #e7ebf2;border-radius:14px;padding:12px;margin-top:9px;background:#fbfcfe}.questionTop{display:flex;justify-content:space-between;gap:8px;align-items:center}.optionRow{display:flex;gap:8px;align-items:center;margin-top:7px}.optionRow input[type=text]{flex:1}
.courseHero{padding:30px 0;background:linear-gradient(135deg,#142e68,#1e5ba4);color:white}.courseHero p{color:#dbe8ff}.courseLayout{display:grid;grid-template-columns:1fr 320px;gap:18px;padding:22px 0}.lessonList{display:grid;gap:9px}.lesson{background:white;border:1px solid var(--line);border-radius:16px;padding:13px}.lesson h4{margin:0 0 5px}.lesson p{font-size:10px;color:var(--muted);margin:0}.videoBox{aspect-ratio:16/9;background:#0b1220;border-radius:18px;overflow:hidden;margin-top:12px}.videoBox iframe,.videoBox video{width:100%;height:100%;border:0}.progressBar{height:7px;background:#edf0f5;border-radius:99px;overflow:hidden}.progressBar span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),#38a1d8)}
#toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);z-index:200;background:#17213af2;color:white;padding:10px 14px;border-radius:999px;box-shadow:0 12px 30px #0003;font-size:10px;font-weight:800;opacity:0;pointer-events:none;transition:.18s;max-width:calc(100% - 24px);text-align:center}#toast.show{opacity:1;transform:translate(-50%,0)}
.footer{padding:30px;text-align:center;color:#8d96a5;font-size:9px}
@media(max-width:980px){.heroGrid{grid-template-columns:1fr}.heroLogo{display:none}.cards{grid-template-columns:1fr 1fr}.roleGrid{grid-template-columns:1fr 1fr}.dashLayout{display:block}.sidebar{position:sticky;top:68px;z-index:60;height:58px;display:flex;gap:7px;padding:7px 9px;overflow-x:auto;overflow-y:hidden;background:#111b31}.sideTitle{display:none}.sideBtn{flex:0 0 auto;width:auto;height:42px;padding:0 12px;white-space:nowrap}.metrics{grid-template-columns:1fr 1fr}.courseLayout{grid-template-columns:1fr}}
@media(max-width:640px){.wrap{width:calc(100% - 20px)}.nav{height:60px}.navlinks{display:none}.brand img{width:40px;height:40px}.brand b{font-size:14px}.navActions .ghost{display:none}.hero{padding:40px 0 28px}.hero h1{font-size:40px}.hero p{font-size:12px}.heroStats{gap:16px}.section{padding:40px 0}.sectionHead{display:block}.sectionHead h2{font-size:28px}.cards,.roleGrid{grid-template-columns:1fr}.formGrid,.split{grid-template-columns:1fr}.field.full{grid-column:auto}.dashMain{padding:12px}.dashHead{align-items:flex-start}.dashHead h1{font-size:21px}.metrics{grid-template-columns:1fr 1fr}.metric{padding:13px}.metric b{font-size:18px}.panel{padding:12px}.listItem{align-items:flex-start;flex-direction:column}.sidebar{top:60px}.courseHero{padding:22px 0}.courseLayout{padding:12px 0}}