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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --warning-hover: #d97706;
    --background: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --sidebar-width: 250px;
    --header-height: 64px;
}

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

.app-container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.logo-text {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-item:hover {
    background: var(--background);
    color: var(--text-primary);
}

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

.nav-icon {
    width: 20px;
    height: 20px;
}

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

.server-status {
    padding: 12px;
    background: var(--background);
    border-radius: 8px;
    margin-bottom: 12px;
}

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

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--danger-color);
}

.status-dot.connected {
    background: var(--success-color);
}

.status-text {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

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

.client-label {
    color: var(--text-secondary);
}

.client-count {
    font-weight: 700;
    color: var(--primary-color);
}

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

.header {
    height: var(--header-height);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    flex-shrink: 0;
}

.page-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    gap: 8px;
}

.section {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: none;
}

.section.active {
    display: block;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon svg {
    width: 24px;
    height: 24px;
}

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

.stat-icon-success {
    background: #dcfce7;
    color: var(--success-color);
}

.stat-icon-danger {
    background: #fee2e2;
    color: var(--danger-color);
}

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

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

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

.content-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 16px;
}

.flex-1 {
    flex: 1;
}

.flex-2 {
    flex: 2;
}

.card {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-header-actions {
    display: flex;
    gap: 8px;
}

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

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

.data-table thead {
    background: var(--background);
}

.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px 16px;
    border-top: 1px solid var(--border);
    font-size: 14px;
}

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

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

.client-list {
    padding: 16px;
    max-height: 400px;
    overflow-y: auto;
}

.client-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--background);
    border-radius: 8px;
    margin-bottom: 8px;
}

.client-item:last-child {
    margin-bottom: 0;
}

.client-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.client-ip {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.client-badges {
    display: flex;
    gap: 6px;
}

.client-badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

.client-badge.websocket {
    background: #dbeafe;
    color: #1d4ed8;
}

.client-badge.http {
    background: #f1f5f9;
    color: #475569;
}

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

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

.form {
    padding: 20px;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.required {
    color: var(--danger-color);
}

input,
select {
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--surface);
    color: var(--text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input::placeholder {
    color: var(--text-secondary);
}

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

.btn {
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background 0.2s, transform 0.1s;
}

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

.btn svg {
    width: 18px;
    height: 18px;
}

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

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

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

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

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

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

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

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

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

.btn-icon-only {
    padding: 8px;
}

.input-small {
    padding: 8px 12px;
    font-size: 13px;
    min-width: 200px;
}

.file-status {
    padding: 20px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--background);
    border-radius: 8px;
    margin-bottom: 8px;
}

.file-item:last-child {
    margin-bottom: 0;
}

.file-name {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.file-size {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.file-download {
    padding: 6px 12px;
    background: var(--primary-color);
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.file-download:hover {
    background: var(--primary-hover);
}

.empty-state {
    padding: 40px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    padding: 12px 16px;
    border-radius: 8px;
    background: var(--surface);
    box-shadow: var(--shadow-md);
    font-size: 14px;
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
    max-width: 320px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
    color: #166534;
}

.toast.error {
    border-left: 4px solid var(--danger-color);
    color: #991b1b;
}

.toast.info {
    border-left: 4px solid var(--primary-color);
    color: #1d4ed8;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@media (max-width: 1200px) {
    .content-row {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .sidebar-nav {
        display: none;
    }

    .sidebar-nav.show {
        display: flex;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

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

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

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

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

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}

.login-card {
    background: var(--surface);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    animation: fadeInUp 0.5s ease-out;
}

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

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: var(--primary-color);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.login-logo svg {
    width: 32px;
    height: 32px;
}

.login-header h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.login-form {
    margin-bottom: 24px;
}

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

.login-form label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.login-form input {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
}

.btn-block {
    width: 100%;
    padding: 12px 20px;
    font-size: 15px;
}

.login-footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.login-footer p {
    font-size: 13px;
    color: var(--text-secondary);
}

.logout-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s;
}

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

.logout-btn svg {
    width: 14px;
    height: 14px;
}