/* ===== CCTV Express Dumaguete - Invoice System ===== */

:root {
    --primary: #1a2744;
    --primary-light: #3a4a6b;
    --accent: #c0392b;
    --success: #27ae60;
    --warning: #f39c12;
    --danger: #e74c3c;
    --gray-50: #f8f9fa;
    --gray-100: #f0f0f0;
    --gray-200: #e0e0e0;
    --gray-300: #ccc;
    --gray-500: #888;
    --gray-700: #555;
    --gray-900: #222;
    --sidebar-width: 240px;
}

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

body {
    font-family: 'Segoe UI', -apple-system, Arial, sans-serif;
    background: var(--gray-100);
    color: var(--gray-900);
    display: flex;
    min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--primary);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 50;
}
.sidebar-brand {
    padding: 28px 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sidebar-brand h2 {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 2px;
}
.sidebar-brand p {
    font-size: 11px;
    color: #aaa;
    margin-top: 2px;
}
.sidebar-nav {
    list-style: none;
    padding: 12px 0;
}
.sidebar-nav li a {
    display: block;
    padding: 12px 24px;
    color: #ccc;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s;
}
.sidebar-nav li a:hover {
    background: rgba(255,255,255,0.08);
    color: #fff;
}
.sidebar-nav li.active a {
    background: rgba(255,255,255,0.12);
    color: #fff;
    border-left: 3px solid var(--accent);
    font-weight: 600;
}

/* ===== MAIN CONTENT ===== */
.content {
    margin-left: var(--sidebar-width);
    padding: 30px 36px;
    flex: 1;
    min-height: 100vh;
}

h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 24px;
}

/* ===== ALERT / FLASH ===== */
.alert {
    padding: 12px 18px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
    font-weight: 500;
}
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-error { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* ===== STATS GRID ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}
.stat-card {
    background: #fff;
    border-radius: 10px;
    padding: 24px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    text-align: center;
}
.stat-number {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 4px;
}
.stat-label {
    font-size: 13px;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== CARD ===== */
.card {
    background: #fff;
    border-radius: 10px;
    padding: 24px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    margin-bottom: 24px;
}
.card h3 {
    font-size: 16px;
    color: var(--primary);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--gray-200);
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.card-header h2 {
    font-size: 18px;
    color: var(--primary);
}

/* ===== DATA TABLE ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th {
    background: var(--gray-50);
    padding: 10px 14px;
    text-align: left;
    font-size: 11px;
    font-weight: 700;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--gray-200);
}
.data-table td {
    padding: 12px 14px;
    font-size: 13px;
    border-bottom: 1px solid var(--gray-100);
    vertical-align: middle;
}
.data-table tr:hover { background: var(--gray-50); }
.data-table .actions { white-space: nowrap; }

/* ===== BADGES ===== */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-draft { background: var(--gray-200); color: var(--gray-700); }
.badge-sent { background: #d6eaf8; color: #2471a3; }
.badge-paid { background: #d4edda; color: #155724; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 8px 18px;
    border: 1px solid var(--gray-300);
    background: #fff;
    color: var(--gray-900);
    font-size: 13px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s;
    line-height: 1.4;
}
.btn:hover { background: var(--gray-50); border-color: var(--gray-500); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-light); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #c0392b; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-lg { padding: 12px 30px; font-size: 15px; }

/* ===== FORMS ===== */
.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 5px;
}
.form-control {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 14px;
    color: var(--gray-900);
    background: #fff;
    transition: border-color 0.15s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,39,68,0.1);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-actions {
    display: flex;
    gap: 10px;
    padding-top: 10px;
}

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}
.modal-content {
    background: #fff;
    border-radius: 12px;
    padding: 28px;
    width: 90%;
    max-width: 550px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.modal-header h2 {
    font-size: 18px;
    color: var(--primary);
}
.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-500);
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--gray-500);
    font-size: 14px;
}
.empty-state a {
    color: var(--primary);
    font-weight: 600;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar { width: 100%; position: relative; }
    .content { margin-left: 0; }
    .form-row { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr; }
}