:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #e0e7ff;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --text: #1e293b;
    --text-muted: #64748b;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.auth-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow);
}

.auth-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.auth-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary);
}

.nav-logout {
    color: var(--danger);
}

.nav-user {
    color: var(--text);
    font-weight: 600;
    font-size: 14px;
}

.auth-main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 24px;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    animation: slideUp 0.3s ease-out;
}

.auth-card-wide {
    max-width: 900px;
}

.auth-card-extra-wide {
    max-width: 1400px;
}

@media (min-width: 1560px) {
    .auth-card-extra-wide {
        max-width: calc(100vw - 48px);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.auth-subtitle {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 15px;
}

.auth-form {
    margin-top: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    color: var(--text);
    background: var(--card-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
}

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

.form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-end;
}

.form-row .form-group {
    flex: 1;
    min-width: 150px;
}

.form-group-checkbox {
    display: flex;
    align-items: center;
    padding-bottom: 4px;
}

.form-group-checkbox label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    margin-bottom: 0;
}

.form-group-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    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-hover);
}

.btn-secondary {
    background: var(--border);
    color: var(--text);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 13px;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 20px;
}

.alert-success {
    background: var(--success-light);
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.alert-error {
    background: var(--error-light);
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.home-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 24px;
}

.home-link {
    display: block;
    padding: 16px 20px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.home-link:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.home-link-admin {
    background: var(--primary-light);
    border-color: #c7d2fe;
}

.admin-section {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.admin-section h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text);
}

.table-wrapper {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--bg);
    border-bottom: 2px solid var(--border);
    font-weight: 600;
    color: var(--text-muted);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

.data-table tbody tr:hover {
    background: var(--bg);
}

.data-table tbody tr.row-selected,
.data-table tbody tr.row-selected:hover {
    background: var(--primary-light);
}

/* Список сессий: высота ~8 строк, прокрутка */
.sessions-scroll {
    max-height: 595px;
    overflow-y: auto;
}

.sessions-scroll .data-table th {
    position: sticky;
    top: 0;
    z-index: 1;
}

.actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.inline-form {
    display: inline;
}

.muted {
    color: var(--text-muted);
}

.stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.stat-card {
    flex: 1;
    min-width: 160px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px 20px;
}

.stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 2px;
}

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
}

.auth-footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    padding: 16px 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

@media (max-width: 640px) {
    .auth-header {
        flex-direction: column;
        gap: 12px;
    }

    .auth-nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .auth-card {
        padding: 24px;
    }

    .form-row {
        flex-direction: column;
    }

    .form-row .form-group {
        min-width: 100%;
    }
}