:root,
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --accent-primary: #f97316;
    --accent-secondary: #06b6d4;
    --accent-hover: #ea580c;
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --card-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --card-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --header-bg: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    --header-text: #ffffff;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.2s ease;
}

[data-theme="dark"],
html[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
    --card-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
    --header-bg: linear-gradient(135deg, #0f172a 0%, #020617 100%);
}

@media (prefers-color-scheme: dark) {
    [data-theme="auto"] {
        --bg-primary: #0f172a;
        --bg-secondary: #1e293b;
        --bg-tertiary: #334155;
        --text-primary: #f1f5f9;
        --text-secondary: #cbd5e1;
        --text-muted: #64748b;
        --border-color: #334155;
        --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
        --card-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.4);
        --header-bg: linear-gradient(135deg, #0f172a 0%, #020617 100%);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* Header */
.header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: inherit;
    text-decoration: none;
}

.header-brand:hover {
    color: inherit;
    opacity: 0.9;
}

.logo {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.header h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.025em;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    color: var(--header-text);
    opacity: 0.8;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
}

.nav-link:hover, .nav-link.active {
    opacity: 1;
    background: rgba(255,255,255,0.15);
    color: var(--header-text);
}

.theme-toggle {
    background: rgba(255,255,255,0.1);
    border: none;
    color: var(--header-text);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.theme-toggle:hover {
    background: rgba(255,255,255,0.2);
}

/* Main Content */
.main {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

.section {
    margin-bottom: 2rem;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.section-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: center;
}

/* Cards */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--card-shadow-lg);
    transform: translateY(-2px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-footer {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* Network Cards */
.network-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
}

.network-card {
    position: relative;
    overflow: hidden;
}

.network-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-primary);
}

.network-card.tailscale::before {
    background: var(--accent-secondary);
}

.network-name {
    font-weight: 700;
    font-size: 1.1rem;
}

.network-detail {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    border-bottom: 1px dashed var(--border-color);
}

.network-detail:last-child {
    border-bottom: none;
}

.network-detail .label {
    color: var(--text-muted);
    font-weight: 500;
}

.network-detail .value {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Stats Bar */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1.25rem;
}

.stat-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-lg);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    display: block;
    line-height: 1;
    margin-bottom: 0.25rem;
}

.stat-value.online { color: var(--success); }
.stat-value.warning { color: var(--warning); }
.stat-value.danger { color: var(--danger); }

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Status Badges */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-badge.online {
    background: var(--success-bg);
    color: var(--success);
}

.status-badge.recent {
    background: var(--warning-bg);
    color: var(--warning);
}

.status-badge.offline {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

/* Table */
.table-container {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
}

.table-toolbar {
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.table-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.table th, .table td {
    padding: 1rem 1.25rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.table th:hover {
    background: var(--bg-secondary);
}

.table th .sort-icon {
    margin-left: 0.5rem;
    opacity: 0.5;
}

.table th.sorted .sort-icon {
    opacity: 1;
}

.table tbody tr {
    transition: var(--transition);
}

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

.table tbody tr:last-child td {
    border-bottom: none;
}

.ip-cell {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.9rem;
    font-weight: 600;
}

.mac-cell {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.time-cell {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 0.5rem;
}

.status-indicator.online {
    background: var(--success);
    box-shadow: 0 0 0 3px var(--success-bg);
}

.status-indicator.recent {
    background: var(--warning);
    box-shadow: 0 0 0 3px var(--warning-bg);
}

.status-indicator.offline {
    background: var(--text-muted);
}

.device-row.online {
    border-left: 3px solid var(--success);
}

.device-row.recent {
    border-left: 3px solid var(--warning);
}

.device-row.offline {
    border-left: 3px solid transparent;
}

.hostname-cell {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.vendor-cell {
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.label-cell {
    font-weight: 500;
    color: var(--accent-primary);
}

.notes-indicator {
    margin-left: 0.5rem;
    cursor: help;
    opacity: 0.7;
}

.notes-indicator:hover {
    opacity: 1;
}

/* Action Buttons */
.actions-cell {
    white-space: nowrap;
}

.btn-icon {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 1rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    line-height: 1;
}

.btn-icon:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

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

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

/* Forms */
.input, .select {
    padding: 0.65rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    width: 100%;
    transition: var(--transition);
}

.input:focus, .select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.1);
}

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

.search-input {
    width: 250px;
    padding-left: 2.5rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 0.75rem center;
    background-size: 1.25rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    padding: 0.65rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    background: var(--bg-tertiary);
    transform: translateY(-1px);
}

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

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

.btn-sm {
    padding: 0.4rem 0.85rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 1rem;
}

.btn-ghost {
    background: transparent;
    border-color: transparent;
}

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

/* Group Select */
.group-select {
    padding: 0.35rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
}

.group-select:focus {
    border-color: var(--accent-primary);
    outline: none;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 480px;
    max-height: 90vh;
    overflow: auto;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    animation: slideUp 0.3s ease;
}

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

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.15rem;
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.25rem;
    line-height: 1;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    background: var(--bg-secondary);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: var(--radius-md);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1100;
    font-weight: 500;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

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

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

/* Scan Progress */
.scan-progress {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    padding: 1rem 1.75rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 200;
    border: 1px solid var(--border-color);
    width: min(420px, calc(100vw - 2rem));
}

.scan-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.scan-progress-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

#scan-title {
    font-weight: 600;
}

.scan-cancel {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.scan-cancel:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.scan-bar {
    position: relative;
    height: 8px;
    border-radius: 999px;
    background: var(--border-color);
    overflow: hidden;
}

.scan-bar-fill {
    height: 100%;
    width: 0;
    border-radius: 999px;
    background: var(--accent-primary);
    transition: width 0.4s ease;
}

/* A network that has never been scanned has no timing history, so there is no
   honest percentage to show. Sweep the bar instead of inventing a number. */
.scan-bar.indeterminate .scan-bar-fill {
    width: 35%;
    transition: none;
    animation: scan-sweep 1.4s ease-in-out infinite;
}

@keyframes scan-sweep {
    0%   { transform: translateX(-100%); }
    100% { transform: translateX(340%); }
}

.scan-progress-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

@media (prefers-reduced-motion: reduce) {
    .scan-bar.indeterminate .scan-bar-fill { animation-duration: 3s; }
    .scan-spinner { animation-duration: 2s; }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/* Auto Refresh Toggle */
.auto-refresh {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.toggle-switch.active {
    background: var(--success);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-switch.active::after {
    left: 22px;
}

/* Export Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--card-shadow-lg);
    min-width: 160px;
    z-index: 50;
    display: none;
}

.dropdown-menu.show {
    display: block;
    animation: fadeIn 0.15s ease;
}

.dropdown-item {
    display: block;
    padding: 0.65rem 1rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
}

.dropdown-item:hover {
    background: var(--bg-secondary);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

/* Keyboard Hint */
.kbd {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    font-family: monospace;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    .main { padding: 1.5rem; }
    .network-cards { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
    .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .header { padding: 0 1rem; }
    .header h1 { display: none; }
    .main { padding: 1rem; }
    .section-header { flex-direction: column; align-items: stretch; }
    .section-actions { justify-content: space-between; }
    .table-container { overflow-x: auto; }
    .table th, .table td { padding: 0.75rem; }
    .search-input { width: 100%; }
    .stat-card { padding: 1rem; }
    .stat-value { font-size: 1.75rem; }
    .toast { left: 1rem; right: 1rem; bottom: 1rem; }
}

/* Copy Animation */
.copy-feedback {
    position: fixed;
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    z-index: 1200;
    animation: copyPop 0.8s ease forwards;
}

@keyframes copyPop {
    0% { opacity: 0; transform: translateY(10px); }
    20% { opacity: 1; transform: translateY(0); }
    80% { opacity: 1; }
    100% { opacity: 0; transform: translateY(-10px); }
}