:root{--blue:#1268e8;--blue2:#6b5cff;--bg:#f5f7fb;--text:#182033;--muted:#718096;--card:#fff;--line:#e7ebf2;--green:#18a66a}
*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none;color:inherit}
.layout{display:flex;min-height:100vh}.sidebar{width:245px;background:#111a35;color:#fff;padding:24px 14px;position:fixed;inset:0 auto 0 0}.brand{display:flex;gap:11px;align-items:center;padding:4px 12px 28px}.brand b{display:block;font-size:18px}.brand small{display:block;color:#9eabc7;margin-top:3px}.logo{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,#1478ff,#8c5cff);display:grid;place-items:center;font-weight:900;font-size:22px}
nav a,.side-bottom a{display:block;padding:13px 14px;border-radius:10px;margin:5px 0;color:#c9d2e8}nav a:hover,nav a.active{background:#23345f;color:#fff}.side-bottom{position:absolute;bottom:24px;left:14px;right:14px}
.main{margin-left:245px;width:calc(100% - 245px);padding:28px 34px}header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}h1{margin:0;font-size:28px}h2{margin:0 0 18px}h3{margin:22px 0 10px}.muted{color:var(--muted)}.user{background:#fff;border:1px solid var(--line);padding:10px 14px;border-radius:12px}
.hero{background:linear-gradient(120deg,#1268e8,#7056ee);color:#fff;border-radius:18px;padding:28px;display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.hero h2{font-size:28px;margin:7px 0}.hero p{margin:0;opacity:.9}.eyebrow{font-size:12px;font-weight:800;letter-spacing:1px}.btn{display:inline-block;border:0;border-radius:9px;padding:11px 16px;font-weight:700;cursor:pointer}.btn.primary{background:var(--blue);color:#fff}.btn.light{background:#fff;color:var(--blue)}.btn.full{width:100%;margin-top:16px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:22px}.stat{background:var(--card);padding:22px;border-radius:16px;border:1px solid var(--line);box-shadow:0 4px 15px #15264a08}.stat span{font-size:24px}.stat b{display:block;font-size:27px;margin:8px 0 2px}.stat small{color:var(--muted)}
.grid.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 4px 15px #15264a08}.section-head{display:flex;justify-content:space-between;align-items:center}.section-head h2{margin:0}.quick a{display:block;border:1px solid var(--line);padding:15px;border-radius:12px;margin:10px 0}.quick a:hover{border-color:#b9ccf7;background:#f8fbff}.quick b{margin-left:8px}.quick span{display:block;color:var(--muted);font-size:13px;margin:4px 0 0 32px}
label{display:block;font-weight:700;font-size:14px;margin:13px 0 6px}input,select{width:100%;padding:12px;border:1px solid #d8deea;border-radius:9px;background:#fff;font:inherit;outline:none}input:focus,select:focus{border-color:var(--blue)}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:12px 9px;border-bottom:1px solid var(--line);font-size:14px}th{color:#68758d;font-size:12px;text-transform:uppercase}.table-wrap{overflow:auto}.link{color:var(--blue);font-weight:700}.danger-text{color:#e5484d}.badge{background:#e8f8ef;color:#138653;border-radius:999px;padding:4px 9px;font-size:12px;font-weight:700}.class-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.class-card{border:1px solid var(--line);border-radius:14px;padding:20px}.class-card span{font-size:28px}.class-card h3{margin:10px 0 6px}.class-card p{color:var(--muted);line-height:1.6}
.login-page{min-height:100vh;display:grid;place-items:center;padding:20px}.login-card{width:min(430px,100%);background:#fff;padding:30px;border-radius:20px;box-shadow:0 15px 50px #13234a18;border:1px solid var(--line)}.login-card.wide{width:min(650px,100%)}.center{text-align:center}.alert{padding:12px 14px;border-radius:10px;margin:12px 0}.alert.danger{background:#fff0f0;color:#b42318}.alert.success{background:#eafaf1;color:#087443}
@media(max-width:900px){.sidebar{width:76px}.sidebar .brand div:not(.logo),.sidebar nav a{font-size:0}.sidebar nav a{height:48px;text-align:center}.main{margin-left:76px;width:calc(100% - 76px);padding:20px}.grid.two,.class-grid,.stats{grid-template-columns:1fr}.hero{display:block}.hero .btn{margin-top:18px}}