/* سیستم مدیریت درس - استایل اصلی */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Vazirmatn', 'Tahoma', 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    direction: rtl;
}

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

a:hover {
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

.navbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

.navbar .user-info {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.95rem;
}

.navbar .btn-logout {
    background: var(--danger);
    color: white;
    border: none;
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
}

.navbar .btn-logout:hover {
    background: #b91c1c;
}

/* Cards */
.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
}

.card h2 {
    margin-bottom: 16px;
    font-size: 1.3rem;
    color: var(--text);
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.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(37, 99, 235, 0.15);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

.btn-success:hover {
    background: #15803d;
}

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

.btn-warning:hover {
    background: #b45309;
}

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

.btn-danger:hover {
    background: #b91c1c;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th, td {
    padding: 12px 14px;
    text-align: right;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg);
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

tr:hover {
    background: #f8fafc;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-pending {
    background: #fef3c7;
    color: #92400e;
}

.badge-approved {
    background: #dcfce7;
    color: #166534;
}

.badge-blocked {
    background: #fee2e2;
    color: #991b1b;
}

/* Login page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 16px;
    padding: 36px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 8px;
    color: var(--primary);
    font-size: 1.5rem;
}

.login-box .subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 28px;
    font-size: 0.95rem;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

/* Actions */
.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-state p {
    margin-top: 8px;
}

/* Tabs / Nav links */
.nav-links {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--card);
    border: 1px solid var(--border);
    color: var(--text);
    font-weight: 500;
}

.nav-links a.active,
.nav-links a:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    text-decoration: none;
}

/* Modal simple */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: white;
    border-radius: var(--radius);
    padding: 24px;
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal h3 {
    margin-bottom: 16px;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

/* Hidden fields */
.hidden {
    display: none !important;
}

/* Footer note */
.footer-note {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 30px;
    padding-bottom: 20px;
}