:root{
    --app-primary:#2563eb;
    --app-primary-dark:#1e40af;
    --app-accent:#06b6d4;
    --app-success:#16a34a;
    --app-warning:#f59e0b;
    --app-danger:#dc2626;
    --app-bg:#f3f6fb;
    --app-card:#ffffff;
    --app-text:#0f172a;
    --app-muted:#64748b;
    --app-border:#e2e8f0;
    --app-radius:18px;
    --app-shadow:0 16px 42px rgba(15,23,42,.08);
    --app-shadow-soft:0 8px 22px rgba(15,23,42,.06);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    min-height:100vh;
    background:
        radial-gradient(circle at 8% 0%, rgba(37,99,235,.16), transparent 30%),
        radial-gradient(circle at 92% 12%, rgba(6,182,212,.13), transparent 28%),
        linear-gradient(180deg,#f8fbff 0%,#eef4fb 100%);
    color:var(--app-text);
    font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}

a{text-decoration:none}.text-muted{color:var(--app-muted)!important}

.app-navbar{
    background:linear-gradient(135deg,#1d4ed8,#2563eb 55%,#06b6d4);
    box-shadow:0 12px 36px rgba(37,99,235,.25);
    border-bottom:1px solid rgba(255,255,255,.20);
}
.app-navbar .navbar-brand,.app-navbar .top-user{color:#fff}
.app-navbar .btn-light{border:0;box-shadow:0 8px 20px rgba(15,23,42,.12)}
.brand-icon{
    width:38px;height:38px;border-radius:14px;
    display:inline-flex;align-items:center;justify-content:center;
    background:rgba(255,255,255,.18);
    border:1px solid rgba(255,255,255,.28);
}
.top-user{
    align-items:center;gap:.5rem;
    padding:.45rem .85rem;
    border-radius:999px;
    background:rgba(255,255,255,.14);
    border:1px solid rgba(255,255,255,.16);
}

.app-shell{padding:0}.app-content{padding:30px}.app-content-public{min-height:calc(100vh - 62px)}
.app-sidebar{
    background:rgba(255,255,255,.74);
    border-right:1px solid var(--app-border);
    backdrop-filter:blur(16px);
}
.sidebar-inner{position:sticky;top:76px;padding:18px}
.sidebar-title{
    display:flex;align-items:center;gap:.75rem;
    padding:14px;margin-bottom:16px;
    border-radius:var(--app-radius);
    background:#fff;
    box-shadow:var(--app-shadow-soft);
}
.sidebar-title small{color:var(--app-muted)}
.avatar-circle{
    width:42px;height:42px;border-radius:50%;
    display:inline-flex;align-items:center;justify-content:center;
    color:#fff;font-weight:800;
    background:linear-gradient(135deg,var(--app-primary),var(--app-accent));
}
.nav-pills .nav-link{
    color:#334155;border-radius:14px;padding:.76rem .9rem;
    display:flex;align-items:center;gap:.7rem;transition:.18s ease;
}
.nav-pills .nav-link i{width:20px;text-align:center;color:#64748b}
.nav-pills .nav-link:hover{background:#eaf2ff;color:var(--app-primary-dark);transform:translateX(2px)}
.nav-pills .nav-link.active{
    background:linear-gradient(135deg,var(--app-primary),var(--app-primary-dark));
    color:#fff;box-shadow:0 10px 22px rgba(37,99,235,.22);
}
.nav-pills .nav-link.active i{color:#fff}

.page-head{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1.25rem}
.page-head h2{font-weight:850;letter-spacing:-.03em;margin:0}.page-subtitle{color:var(--app-muted);margin-top:.2rem}
.card,.table-responsive,.question-box,.soft-card{
    border:1px solid var(--app-border)!important;
    border-radius:var(--app-radius)!important;
    box-shadow:var(--app-shadow);
    background:var(--app-card);
}
.card{overflow:hidden}.card-header{border-bottom:1px solid var(--app-border)}
.card-kpi{border:0!important;border-radius:var(--app-radius)!important;box-shadow:var(--app-shadow);overflow:hidden;position:relative}
.card-kpi:before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:linear-gradient(90deg,var(--app-primary),var(--app-accent))}
.card-kpi .card-body{padding:1.25rem}.card-kpi h6{letter-spacing:.04em;text-transform:uppercase;font-size:.75rem}.card-kpi h2{font-weight:850;margin-bottom:0;letter-spacing:-.03em}
.stat-icon{width:46px;height:46px;border-radius:16px;display:inline-flex;align-items:center;justify-content:center;background:#eaf2ff;color:var(--app-primary);font-size:1.12rem}
.stat-icon.success{background:#dcfce7;color:var(--app-success)}.stat-icon.warning{background:#fef3c7;color:#b45309}.stat-icon.danger{background:#fee2e2;color:var(--app-danger)}.stat-icon.info{background:#cffafe;color:#0891b2}

.chart-card{min-height:360px}.chart-wrap{position:relative;height:285px;width:100%}.chart-wrap.sm{height:230px}
.dashboard-hero{
    border-radius:24px;padding:24px;color:#fff;margin-bottom:1.25rem;
    background:linear-gradient(135deg,#1e40af,#2563eb 58%,#06b6d4);
    box-shadow:0 20px 52px rgba(37,99,235,.25);
    overflow:hidden;position:relative;
}
.dashboard-hero:after{content:"";position:absolute;right:-70px;top:-70px;width:220px;height:220px;border-radius:50%;background:rgba(255,255,255,.12)}
.dashboard-hero h2{font-weight:850;letter-spacing:-.03em}.dashboard-hero p{color:#dbeafe;margin-bottom:0}
.quick-actions{display:flex;gap:.55rem;flex-wrap:wrap}.quick-actions .btn{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.25);color:#fff}.quick-actions .btn:hover{background:#fff;color:var(--app-primary)}

.table{margin-bottom:0;vertical-align:middle}.table thead th,.table tr:first-child th{background:#f8fafc;color:#475569;font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;border-bottom:1px solid var(--app-border)}
.table td,.table th{padding:.9rem}.table-hover tbody tr:hover{background:#f8fbff}.table td .fw-semibold{line-height:1.35}
.btn{border-radius:12px;font-weight:650}.btn-primary{background:var(--app-primary);border-color:var(--app-primary)}.btn-primary:hover{background:var(--app-primary-dark);border-color:var(--app-primary-dark)}
.form-control,.form-select{border-radius:12px;border-color:#cbd5e1;padding:.68rem .85rem}.form-control:focus,.form-select:focus{border-color:var(--app-primary);box-shadow:0 0 0 .2rem rgba(37,99,235,.14)}
.question-box{border-left:5px solid var(--app-primary)!important;background:#fff;padding:20px;margin-bottom:18px}.badge{border-radius:999px;padding:.42rem .65rem}.alert{border:0;border-radius:16px}.progress-thin{height:9px;border-radius:999px;overflow:hidden;background:#e2e8f0}.progress-thin span{display:block;height:100%;background:linear-gradient(135deg,var(--app-primary),var(--app-accent))}
.empty-state{padding:34px;text-align:center;color:var(--app-muted)}.empty-state i{font-size:2rem;color:#cbd5e1;margin-bottom:.75rem}
.action-bar{display:flex;gap:.45rem;flex-wrap:wrap}

.login-hero{max-width:1050px;margin:42px auto;display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:stretch}.hero-panel{border-radius:26px;padding:38px;color:#fff;background:linear-gradient(135deg,#1d4ed8,#2563eb 55%,#06b6d4);box-shadow:0 22px 60px rgba(37,99,235,.3)}.hero-panel h1{font-weight:850;letter-spacing:-.03em}.hero-list{list-style:none;padding:0;margin:24px 0 0}.hero-list li{display:flex;align-items:center;gap:.75rem;margin:.8rem 0;color:#e0f2fe}.login-card{border-radius:26px!important}

.exam-timer-sticky{position:sticky;top:82px;z-index:10}.question-card{transition:.2s ease}.question-card.is-active{outline:3px solid rgba(37,99,235,.14);transform:translateY(-1px)}.question-timer{font-variant-numeric:tabular-nums}.answer-option:hover{background:#f8fbff}.answer-option input:checked + label{font-weight:800;color:var(--app-primary-dark)}

@media (max-width:991.98px){.chart-card{min-height:auto}.chart-wrap{height:260px}}
@media (max-width:767.98px){.app-content{padding:18px}.app-sidebar{min-height:auto!important;border-right:0;border-bottom:1px solid var(--app-border)}.sidebar-inner{position:static;padding:14px}.nav-pills .nav-link{padding:.65rem .8rem}.login-hero{grid-template-columns:1fr;margin:18px auto}.hero-panel{padding:26px}.page-head{align-items:flex-start;flex-direction:column}.action-bar .btn,.quick-actions .btn{width:100%}.dashboard-hero{padding:20px}.chart-wrap{height:240px}}