:root {
    --bg: #f0f2f5;
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #6366f1;
    --card-bg: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-text: #065f46;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --warning-text: #92400e;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --danger-text: #991b1b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #eef2ff;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.04), 0 2px 4px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.04);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    min-height: 100vh;
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-hover); }

/* ─── Sidebar ─── */
.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    overflow-y: auto;
}

.sidebar-brand {
    padding: 1.5rem 1.5rem 1.25rem;
    font-size: 1rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.sidebar-brand::before {
    content: "";
    display: block;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary), #818cf8);
    flex-shrink: 0;
}

.sidebar-nav {
    padding: 0.5rem 0.75rem;
    flex: 1;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 0.6rem 0.85rem;
    color: var(--sidebar-text);
    font-size: 0.875rem;
    font-weight: 450;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    margin-bottom: 2px;
}

.sidebar-nav a:hover {
    background: var(--sidebar-hover);
    color: #e2e8f0;
}

.sidebar-nav a.active {
    background: rgba(99, 102, 241, 0.15);
    color: #fff;
    font-weight: 550;
}

.sidebar-nav a.active::before {
    content: "";
    display: inline-block;
    width: 3px;
    height: 16px;
    background: var(--sidebar-active);
    border-radius: 2px;
    margin-right: 0.6rem;
    flex-shrink: 0;
}

.sidebar-footer {
    margin-top: auto;
    padding: 1rem 1.25rem;
    border-top: 1px solid rgba(255,255,255,0.06);
    font-size: 0.8rem;
    color: var(--sidebar-text);
}

.sidebar-footer a {
    display: block;
    padding: 0.4rem 0;
    color: var(--sidebar-text);
    font-size: 0.8rem;
    transition: color var(--transition);
}

.sidebar-footer a:hover { color: #fff; }

/* ─── Main content ─── */
.main {
    flex: 1;
    margin-left: 240px;
    padding: 2rem 2.5rem;
    min-height: 100vh;
    max-width: 1200px;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 1.75rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* ─── Cards ─── */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.card-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.5rem;
}

.card-value {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text);
    line-height: 1.2;
}

/* ─── Tables ─── */
.table-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: 2rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

th, td {
    text-align: left;
    padding: 0.75rem 1.15rem;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.875rem;
}

th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.07em;
    padding: 0.85rem 1.15rem;
    border-bottom: 1px solid var(--border);
}

tr:last-child td { border-bottom: none; }

tr:hover td { background: #f8fafc; }

td a {
    font-weight: 550;
}

/* ─── Badges ─── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.65rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.badge-success { background: var(--success-bg); color: var(--success-text); }
.badge-warning { background: var(--warning-bg); color: var(--warning-text); }
.badge-danger { background: var(--danger-bg); color: var(--danger-text); }
.badge-info { background: var(--primary-light); color: var(--primary); }

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 1.15rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 550;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    line-height: 1.4;
    color: var(--text-secondary);
    background: var(--card-bg);
    border: 1px solid var(--border);
}

.btn:hover {
    background: var(--border-light);
    color: var(--text);
    border-color: #cbd5e1;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 1px 3px rgba(99,102,241,0.25);
}

.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: 0 2px 6px rgba(99,102,241,0.35);
    color: #fff;
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}

.btn-danger:hover {
    background: #dc2626;
    border-color: #dc2626;
    color: #fff;
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.78rem;
    border-radius: 6px;
}

/* ─── Forms ─── */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.825rem;
    font-weight: 550;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.6rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-family: inherit;
    background: #fff;
    color: var(--text);
    transition: all var(--transition);
}

.form-group input:hover,
.form-group select:hover {
    border-color: #cbd5e1;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

/* ─── Flash messages ─── */
.flash {
    padding: 0.75rem 1.15rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.25rem;
    font-size: 0.85rem;
    font-weight: 500;
    border-left: 3px solid transparent;
}

.flash-error {
    background: var(--danger-bg);
    color: var(--danger-text);
    border-left-color: var(--danger);
}

.flash-success {
    background: var(--success-bg);
    color: var(--success-text);
    border-left-color: var(--success);
}

/* ─── Status dot ─── */
.dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.4rem;
    vertical-align: middle;
}

.dot-green {
    background: var(--success);
    box-shadow: 0 0 0 3px rgba(16,185,129,0.2);
}

.dot-red {
    background: var(--danger);
    box-shadow: 0 0 0 3px rgba(239,68,68,0.15);
}

.dot-gray {
    background: var(--text-muted);
    box-shadow: 0 0 0 3px rgba(148,163,184,0.15);
}

/* ─── Section titles ─── */
.section-title {
    font-size: 1rem;
    font-weight: 650;
    margin-bottom: 1rem;
    color: var(--text);
    letter-spacing: -0.01em;
}

/* ─── Login page ─── */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    width: 100%;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
}

.login-box {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--shadow-lg), 0 0 60px rgba(99,102,241,0.08);
}

.login-box h1 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.35rem;
    text-align: center;
    letter-spacing: -0.02em;
}

.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1.75rem;
}

.login-box .btn-primary {
    width: 100%;
    padding: 0.7rem;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* ─── Empty states ─── */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        position: relative;
        flex-direction: row;
        overflow-x: auto;
        padding: 0;
    }

    .sidebar-brand {
        padding: 0.75rem 1rem;
        white-space: nowrap;
    }

    .sidebar-nav {
        display: flex;
        padding: 0.5rem;
        gap: 0.25rem;
    }

    .sidebar-nav a {
        white-space: nowrap;
        padding: 0.5rem 0.75rem;
    }

    .sidebar-footer { display: none; }

    body { flex-direction: column; }

    .main {
        margin-left: 0;
        padding: 1.25rem;
    }

    .cards {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}