:root{--bg:#f6f8fc;--card:rgba(255,255,255,.82);--ink:#122033;--muted:#64748b;--line:#e5eaf2;--primary:#1769ff;--primary2:#6b5cff;--ok:#0f9d70;--shadow:0 18px 55px rgba(27,49,90,.11);--radius:24px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;background:radial-gradient(circle at 10% 0,#e9f1ff,transparent 30%),radial-gradient(circle at 90% 20%,#f0eaff,transparent 30%),var(--bg);color:var(--ink)}
a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}button{cursor:pointer;border:0}.container{width:min(1180px,calc(100% - 32px));margin:auto}
.nav{position:sticky;top:12px;z-index:50;margin:12px auto}.nav-in{display:flex;align-items:center;gap:18px;padding:13px 16px;background:rgba(255,255,255,.82);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.9);box-shadow:var(--shadow);border-radius:20px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;white-space:nowrap}.logo{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:900}.nav-links{display:flex;gap:4px;align-items:center;flex:1;justify-content:center}.nav-links a{padding:10px 11px;border-radius:12px;color:#536175;font-weight:700;font-size:14px}.nav-links a:hover,.nav-links a.active{background:#edf3ff;color:var(--primary)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 17px;border-radius:14px;background:#fff;border:1px solid var(--line);font-weight:800}.btn-primary{color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 10px 25px rgba(55,94,255,.22)}.btn-danger{background:#fff1f2;color:#be123c}.btn-small{padding:9px 12px;font-size:13px}.hero{padding:70px 0 35px}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}.eyebrow{display:inline-flex;padding:8px 12px;border-radius:99px;background:#eaf1ff;color:var(--primary);font-weight:900;font-size:13px}.hero h1{font-size:clamp(42px,6vw,76px);line-height:.98;letter-spacing:-3px;margin:18px 0}.hero p{font-size:18px;line-height:1.7;color:var(--muted);max-width:680px}.hero-card{padding:28px;border-radius:32px;background:linear-gradient(145deg,#fff,#eef4ff);box-shadow:var(--shadow);border:1px solid #fff}.hero-card .orb{height:300px;border-radius:28px;background:radial-gradient(circle at 35% 35%,#fff 0 4%,transparent 5%),linear-gradient(135deg,#dceaff,#e9e3ff);display:grid;place-items:center;font-size:100px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.section{padding:55px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}.section h2{font-size:36px;letter-spacing:-1.5px;margin:0}.muted{color:var(--muted)}.grid{display:grid;gap:18px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.card{background:var(--card);border:1px solid rgba(220,227,239,.9);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);backdrop-filter:blur(18px)}.icon{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;background:#eef4ff;font-size:22px}.stat{font-size:35px;font-weight:950;margin-top:8px}.course-cover{height:150px;border-radius:18px;background:linear-gradient(135deg,#dceaff,#e9e2ff);display:grid;place-items:center;font-size:48px;margin-bottom:18px}.tag{display:inline-flex;padding:6px 9px;border-radius:9px;background:#eef2f7;color:#536175;font-size:12px;font-weight:800}.teacher{display:flex;gap:14px;align-items:center}.avatar{width:64px;height:64px;border-radius:20px;background:linear-gradient(135deg,#dbeafe,#ede9fe);display:grid;place-items:center;font-size:26px;font-weight:900}.form{display:grid;gap:14px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.field{display:grid;gap:7px}.field label{font-size:13px;font-weight:900}.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:13px;padding:12px 13px;outline:none}.field textarea{min-height:120px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:#9abaff;box-shadow:0 0 0 4px #edf3ff}.notice{padding:14px 16px;border-radius:14px;background:#eefbf6;color:#087f5b;font-weight:700}.footer{margin-top:50px;background:#101a2b;color:#dce5f2;padding:50px 0}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}.footer a{color:#b8c4d6}.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:13px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}.table th{font-size:12px;color:#64748b;text-transform:uppercase}.badge{display:inline-flex;padding:6px 9px;border-radius:99px;font-size:12px;font-weight:900;background:#eef2f7}.badge.ok{background:#e9fbf3;color:#087f5b}.badge.warn{background:#fff7df;color:#9a6700}.badge.bad{background:#fff0f1;color:#be123c}.mobile-toggle{display:none}.page{animation:pageIn .55s ease}.falling{animation:fall .45s ease forwards}.modal{position:fixed;inset:0;background:rgba(10,18,30,.45);backdrop-filter:blur(6px);display:none;align-items:center;justify-content:center;padding:20px;z-index:100}.modal.show{display:flex}.modal-box{width:min(620px,100%);max-height:90vh;overflow:auto;background:#fff;border-radius:24px;padding:24px;box-shadow:0 30px 100px rgba(0,0,0,.2)}.admin-shell{display:grid;grid-template-columns:250px 1fr;min-height:calc(100vh - 90px);gap:18px}.sidebar{position:sticky;top:92px;height:calc(100vh - 110px);overflow:auto;background:#101a2b;color:#dce5f2;border-radius:24px;padding:18px}.sidebar a{display:flex;gap:10px;padding:11px 12px;border-radius:12px;color:#b9c6d8;font-weight:700}.sidebar a:hover,.sidebar a.active{background:#1c2a42;color:#fff}.dashboard{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.login{min-height:75vh;display:grid;place-items:center}.login-card{width:min(480px,100%);padding:28px;background:#fff;border-radius:28px;box-shadow:var(--shadow)}.toast{position:fixed;right:20px;bottom:20px;background:#111827;color:#fff;padding:13px 17px;border-radius:14px;display:none;z-index:200}.toast.show{display:block}.empty{padding:35px;text-align:center;color:var(--muted)}
@media(max-width:900px){.nav-links{display:none}.mobile-toggle{display:block;margin-left:auto}.nav-in{flex-wrap:wrap}.nav-links.open{display:flex;flex-direction:column;flex-basis:100%;align-items:stretch}.hero-grid{grid-template-columns:1fr}.grid-3,.grid-4{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.admin-shell{grid-template-columns:1fr}.sidebar{position:relative;top:auto;height:auto}.dashboard{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.container{width:min(100% - 22px,1180px)}.hero{padding-top:35px}.hero h1{font-size:45px}.grid-3,.grid-4,.form-grid,.footer-grid,.dashboard{grid-template-columns:1fr}.section h2{font-size:30px}.hero-card .orb{height:220px}.actions .btn{width:100%}}