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

:root {
    --primary: #0d6efd;
    --primary-dark: #0b5ed7;
    --primary-light: #6ea8fe;
    --secondary: #6c757d;
    --success: #198754;
    --danger: #dc3545;
    --warning: #ffc107;
    --info: #0dcaf0;

    --bg: #f8f9fc;
    --bg-card: #ffffff;
    --text: #212529;
    --text-muted: #6c757d;
    --border: #dee2e6;

    --radius: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --transition: 0.2s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* ── Layout ── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ── Login Page ── */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem;
    background: linear-gradient(135deg, #0d6efd 0%, #6610f2 100%);
}

.login-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
}

.login-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text);
}

.login-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

/* ── Register Page ── */
.register-card {
    max-width: 520px;
}

/* ── Forms ── */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--text);
}

.form-control {
    width: 100%;
    padding: 0.6rem 0.85rem;
    font-size: 0.95rem;
    font-family: var(--font);
    border: 1.5px solid var(--border);
    border-radius: 6px;
    background: #fff;
    color: var(--text);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
}

.form-control.error {
    border-color: var(--danger);
}

.form-control.error:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15);
}

.error-text {
    color: var(--danger);
    font-size: 0.8rem;
    margin-top: 0.25rem;
    display: none;
}

.error-text.visible {
    display: block;
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-primary:disabled {
    background: var(--primary-light);
    cursor: not-allowed;
    transform: none;
}

.btn-block {
    width: 100%;
}

.btn-link {
    background: transparent;
    color: var(--primary);
    padding: 0.4rem 0.6rem;
}

.btn-link:hover {
    background: rgba(13, 110, 253, 0.08);
    transform: none;
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.85rem;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #b02a37;
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #146c43;
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--border);
}

.btn-outline:hover {
    background: var(--bg);
    border-color: var(--secondary);
}

/* ── Alert / Toast ── */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    display: none;
}

.alert.visible {
    display: block;
}

.alert-error {
    background: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
}

.alert-success {
    background: #d1e7dd;
    color: #0f5132;
    border: 1px solid #badbcc;
}

.alert-info {
    background: #cff4fc;
    color: #055160;
    border: 1px solid #b6effb;
}

/* ── Sidebar / Dashboard Layout ── */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background: #1e293b;
    color: #e2e8f0;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid #334155;
}

.sidebar-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    color: white;
}

.sidebar-header small {
    color: #94a3b8;
    font-size: 0.8rem;
}

.sidebar-nav {
    padding: 0.75rem 0;
    flex: 1;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 1rem;
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.9rem;
    transition: background var(--transition), color var(--transition);
    border-left: 3px solid transparent;
}

.sidebar-nav a:hover {
    background: #334155;
    color: white;
    text-decoration: none;
}

.sidebar-nav a.active {
    background: #334155;
    color: white;
    border-left-color: var(--primary);
    font-weight: 600;
}

.sidebar-nav a .icon {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid #334155;
    font-size: 0.85rem;
}

.sidebar-footer .user-name {
    color: white;
    font-weight: 600;
}

.sidebar-footer .user-plan {
    color: #94a3b8;
    font-size: 0.8rem;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.topbar {
    background: var(--bg-card);
    padding: 0.85rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar h3 {
    font-size: 1.15rem;
    font-weight: 600;
}

.content-area {
    padding: 1.5rem;
    flex: 1;
    overflow-y: auto;
}

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem;
    margin-bottom: 1rem;
}

.card-header {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem;
}

.stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-card .stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ── Tables ── */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

table th {
    text-align: left;
    padding: 0.7rem 0.85rem;
    background: #f1f3f5;
    font-weight: 600;
    color: var(--text);
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

table td {
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

table tr:hover td {
    background: #f8f9fa;
}

/* ── Badges ── */
.badge {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 50px;
}

.badge-success {
    background: #d1e7dd;
    color: #0f5132;
}

.badge-warning {
    background: #fff3cd;
    color: #664d03;
}

.badge-danger {
    background: #f8d7da;
    color: #842029;
}

.badge-info {
    background: #cff4fc;
    color: #055160;
}

/* ── Loading ── */
.loading {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    border: 2.5px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.loading-sm {
    width: 0.9rem;
    height: 0.9rem;
    border-width: 2px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ── Page Header ── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.page-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
}

/* ── Notifications ── */
.notif-bell {
    position: relative;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    transition: background var(--transition);
    user-select: none;
}

.notif-bell:hover {
    background: var(--bg);
}

.notif-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    background: var(--danger);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}

.notif-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    width: 360px;
    max-height: 400px;
    overflow-y: auto;
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    z-index: 1000;
    display: none;
    margin-top: 0.5rem;
}

.notif-dropdown.open {
    display: block;
}

.notif-dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 0.9rem;
}

.notif-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background var(--transition);
}

.notif-item:hover {
    background: #f8f9fa;
}

.notif-item:last-child {
    border-bottom: none;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
}

/* ── Modal (simple) ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.modal-box {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    width: 100%;
    max-width: 500px;
    max-height: 85vh;
    overflow-y: auto;
}

.modal-box h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

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

.empty-state .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-state h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .sidebar {
        width: 60px;
    }

    .sidebar-header h2,
    .sidebar-header small,
    .sidebar-nav a span,
    .sidebar-footer {
        display: none;
    }

    .sidebar-nav a {
        justify-content: center;
        padding: 0.85rem;
    }

    .sidebar-nav a .icon {
        margin: 0;
        font-size: 1.25rem;
    }
}

.notif-badge-sidebar {
    margin-left: auto;
    background: var(--danger);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    min-width: 18px;
    height: 18px;
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
}