:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary: #6366f1;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--gray-50);
    min-height: 100vh;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    overflow: hidden;
}

.card-header {
    padding: 32px 24px;
    text-align: center;
    border-bottom: 1px solid var(--gray-100);
}

.card-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.card-header .subtitle {
    color: var(--gray-500);
    font-size: 14px;
}

.card-header .platform-badge {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    margin-top: 8px;
}

.card-body {
    padding: 24px;
}

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

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 6px;
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--gray-700);
    background: var(--white);
    transition: var(--transition);
}

.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(59, 130, 246, 0.1);
}

.form-group input::placeholder {
    color: var(--gray-400);
}

.form-group .readonly-input {
    background: var(--gray-100);
    cursor: not-allowed;
}

.form-group small {
    display: block;
    color: var(--gray-500);
    margin-top: 4px;
    font-size: 12px;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
}

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

.btn-warning:hover:not(:disabled) {
    background: #d97706;
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 12px;
}

.links {
    text-align: center;
    margin-top: 20px;
    color: var(--gray-600);
}

.links a {
    color: var(--primary);
    font-size: 14px;
}

.links .divider {
    margin: 0 12px;
    color: var(--gray-300);
}

.alert {
    padding: 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}

.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.alert-info {
    background: #e0f2fe;
    color: #075985;
    border: 1px solid #7dd3fc;
}

.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    z-index: 9999;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

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

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

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

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

.login-mode-tabs {
    display: flex;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--gray-200);
}

.tab-btn {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--gray-700);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.status-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.status-badge.success {
    background: #d1fae5;
    color: #065f46;
}

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

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

.role-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    background: var(--secondary);
    color: var(--white);
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.badge.success {
    background: #d1fae5;
    color: #065f46;
}

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

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

.admin-card {
    max-width: 420px;
    margin: 60px auto;
}

.landing-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.landing-header {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.landing-header .logo h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
}

.landing-nav {
    display: flex;
    gap: 12px;
}

.landing-main {
    flex: 1;
    padding: 60px 32px;
}

.hero {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-content {
    flex: 1;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 18px;
    color: var(--gray-600);
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.hero-illustration {
    flex: 1;
    display: flex;
    justify-content: center;
}

.features {
    max-width: 1200px;
    margin: 80px auto 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--gray-500);
}

.usage-guide {
    max-width: 1200px;
    margin: 80px auto 0;
    text-align: center;
}

.usage-guide h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 48px;
}

.steps {
    display: flex;
    justify-content: center;
    gap: 48px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 200px;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.step-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.step-content p {
    font-size: 14px;
    color: var(--gray-500);
}

.landing-footer {
    background: var(--white);
    padding: 24px;
    text-align: center;
    color: var(--gray-500);
    font-size: 14px;
    border-top: 1px solid var(--gray-200);
}

.profile-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.profile-header .logo h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-email {
    color: var(--gray-600);
    font-size: 14px;
}

.profile-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

.profile-container {
    display: flex;
    gap: 32px;
}

.profile-sidebar {
    width: 280px;
    flex-shrink: 0;
}

.user-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.user-avatar {
    width: 80px;
    height: 80px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.user-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.user-id {
    display: inline-block;
    background: var(--gray-100);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    color: var(--gray-600);
    margin-bottom: 12px;
}

.user-status {
    margin-top: 8px;
}

.profile-nav {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.profile-nav a {
    display: block;
    padding: 16px 24px;
    color: var(--gray-600);
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: var(--transition);
}

.profile-nav a:hover {
    background: var(--gray-50);
    color: var(--gray-900);
}

.profile-nav a.active {
    background: #eff6ff;
    color: var(--primary);
    border-left-color: var(--primary);
}

.profile-content {
    flex: 1;
}

.profile-content h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 24px;
}

.profile-content .card {
    margin-bottom: 24px;
}

.profile-content .card-header {
    text-align: left;
    padding: 20px 24px;
}

.profile-content .card-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
}

.platforms-list,
.sessions-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.platform-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.platform-info h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.platform-info p {
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 4px;
}

.session-item {
    padding: 16px;
    background: var(--gray-50);
    border-radius: var(--radius);
}

.session-device {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    color: var(--gray-700);
    font-weight: 500;
}

.session-details {
    display: flex;
    gap: 16px;
    font-size: 12px;
    color: var(--gray-500);
}

.session-browser {
    display: block;
    margin-top: 8px;
    color: var(--gray-400);
    font-size: 11px;
    word-break: break-all;
}

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--gray-500);
}

.empty-state .text-muted {
    color: var(--gray-400);
    font-size: 12px;
}

.stats-row {
    display: flex;
    gap: 32px;
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: 12px;
    color: var(--gray-500);
}

.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--gray-900);
    color: var(--white);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 1000;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--gray-700);
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.admin-badge {
    font-size: 12px;
    color: var(--gray-400);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 0;
    overflow-y: auto;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--gray-400);
    font-size: 14px;
    transition: var(--transition);
}

.sidebar-nav a:hover {
    background: var(--gray-800);
    color: var(--white);
}

.sidebar-nav a.active {
    background: var(--primary);
    color: var(--white);
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--gray-700);
}

.admin-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-size: 14px;
}

.admin-info .role-badge {
    background: var(--secondary);
}

.logout-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-400);
    font-size: 14px;
    padding: 8px 12px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.logout-btn:hover {
    background: var(--gray-800);
    color: var(--danger);
}

.main-content {
    flex: 1;
    margin-left: 260px;
    background: var(--gray-50);
}

.page-header {
    background: var(--white);
    padding: 20px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
}

.current-time {
    color: var(--gray-500);
    font-size: 14px;
}

.content-area {
    padding: 32px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--white);
    padding: 24px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon.users {
    background: #dbeafe;
    color: var(--primary);
}

.stat-icon.platforms {
    background: #d1fae5;
    color: var(--success);
}

.stat-icon.admins {
    background: #fef3c7;
    color: var(--warning);
}

.stat-icon.sessions {
    background: #e0e7ff;
    color: var(--secondary);
}

.stat-info {
    flex: 1;
}

.stat-info .stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.2;
}

.stat-info .stat-label {
    font-size: 13px;
    color: var(--gray-500);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.search-input {
    padding: 10px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    width: 300px;
    font-size: 14px;
}

.select-input {
    padding: 10px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 14px;
    background: var(--white);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-600);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table td {
    font-size: 14px;
    color: var(--gray-700);
}

.table code {
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    font-family: monospace;
}

.table tbody tr:hover {
    background: var(--gray-50);
}

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

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--white);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
}

.close {
    font-size: 24px;
    color: var(--gray-400);
    cursor: pointer;
    transition: var(--transition);
}

.close:hover {
    color: var(--gray-600);
}

.modal-body {
    padding: 24px;
}

.text-muted {
    color: var(--gray-500);
}

@media (max-width: 1200px) {
    .features {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .main-content {
        margin-left: 0;
    }

    .hero {
        flex-direction: column;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 36px;
    }

    .hero-actions {
        justify-content: center;
    }

    .profile-container {
        flex-direction: column;
    }

    .profile-sidebar {
        width: 100%;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .landing-header {
        padding: 12px 16px;
    }

    .landing-main {
        padding: 40px 16px;
    }

    .hero-content h2 {
        font-size: 28px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .steps {
        flex-direction: column;
        align-items: center;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .page-header {
        padding: 16px;
    }

    .page-header h1 {
        font-size: 20px;
    }

    .content-area {
        padding: 16px;
    }

    .toolbar {
        flex-wrap: wrap;
    }

    .search-input {
        width: 100%;
    }
}