:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --light-bg: #f5f7fb;
    --dark: #111827;
    --muted: #6b7280;
    --card: #ffffff;
    --border: #e5e7eb;
    --radius: 18px;
}

* { box-sizing: border-box; }

body {
    font-family: "Inter", "Segoe UI", Arial, sans-serif;
    background: var(--light-bg);
    color: var(--dark);
    margin: 0;
}

a { text-decoration: none; }

.login-body {
    min-height: 100vh;
    background:
        radial-gradient(circle at top left, rgba(37, 99, 235, 0.18), transparent 35%),
        radial-gradient(circle at bottom right, rgba(220, 38, 38, 0.12), transparent 35%),
        #f8fafc;
}

.login-wrapper {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 430px;
    background: #fff;
    padding: 32px;
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(15, 23, 42, 0.12);
}

.logo-circle {
    width: 64px;
    height: 64px;
    border-radius: 20px;
    background: linear-gradient(135deg, var(--primary), var(--danger));
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 30px;
    font-weight: 800;
    margin: auto;
}

.form-control, .form-select {
    border-radius: 12px;
    padding: 11px 14px;
    border-color: var(--border);
}

.btn {
    border-radius: 12px;
    padding: 10px 16px;
    font-weight: 600;
}

.dashboard-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #ffffff;
    border-right: 1px solid var(--border);
    padding: 20px;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 100;
}

.sidebar-brand {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 28px;
}

.sidebar-nav a {
    display: block;
    padding: 12px 14px;
    color: #374151;
    border-radius: 12px;
    margin-bottom: 8px;
    font-weight: 600;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    background: #eef4ff;
    color: var(--primary);
}

.main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    min-height: 100vh;
}

.topbar {
    height: 72px;
    background: #ffffff;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.content { padding: 28px; }

.card-box {
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 24px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.stat-card {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 22px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.stat-card h3 {
    font-size: 30px;
    font-weight: 800;
    margin: 0;
}

.stat-card p {
    margin: 4px 0 0;
    color: var(--muted);
}

.table { background: #fff; }

.badge-role {
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}
.badge-admin { background: #fee2e2; color: #b91c1c; }
.badge-adviser { background: #dbeafe; color: #1d4ed8; }
.badge-teacher { background: #dcfce7; color: #15803d; }
.badge-student { background: #fef3c7; color: #b45309; }

.mobile-menu-btn { display: none; }

@media (max-width: 900px) {
    .sidebar { transform: translateX(-100%); transition: 0.25s ease; }
    .sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; width: 100%; }
    .mobile-menu-btn { display: inline-flex; }
    .topbar { padding: 0 16px; }
    .content { padding: 18px; }
}