:root {
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-subtle: #f1f5f9;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --accent-primary: #2563eb;
    --accent-hover: #1d4ed8;
    --accent-soft: #eff6ff;
    --accent-border: #bfdbfe;

    --success: #10b981;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;

    --warning: #f59e0b;
    --warning-bg: #fffbeb;

    --danger: #ef4444;
    --danger-bg: #fef2f2;

    --purple: #7c3aed;
    --purple-bg: #f5f3ff;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1rem;
    position: fixed;
    height: 100vh;
    z-index: 20;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0 0.5rem 1.5rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--accent-primary), #3b82f6);
    color: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-top: 1.5rem;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.75rem 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.925rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-item i {
    font-size: 1.2rem;
}

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

.nav-item.active {
    background-color: var(--accent-soft);
    color: var(--accent-primary);
    font-weight: 600;
}

.badge {
    margin-left: auto;
    background-color: var(--accent-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

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

.server-status {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.75rem;
    background-color: var(--bg-subtle);
    border-radius: var(--radius-md);
}

.status-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.status-dot.online {
    background-color: var(--success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.server-info {
    display: flex;
    flex-direction: column;
}

.server-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.server-address {
    font-size: 0.725rem;
    color: var(--text-muted);
}

/* Main Content Area */
.main-content {
    margin-left: 260px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Topbar */
.topbar {
    height: 70px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background-color: var(--bg-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.55rem 1rem;
    width: 380px;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--accent-primary);
    background-color: var(--bg-surface);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.search-box i {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.9rem;
    color: var(--text-primary);
    width: 100%;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.55rem 1.1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    position: relative;
}

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

.notification-dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    background-color: var(--danger);
    border-radius: 50%;
    border: 2px solid var(--bg-surface);
}

.user-profile {
    margin-left: 0.5rem;
}

.avatar {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, #e2e8f0, #cbd5e1);
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--bg-surface);
    box-shadow: var(--shadow-sm);
}

/* Dashboard Body */
.dashboard-body {
    padding: 2rem;
}

.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.75rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.header-buttons {
    display: flex;
    gap: 0.75rem;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

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

.btn-secondary:hover {
    background-color: var(--bg-subtle);
    border-color: var(--border-hover);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1.1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.bg-blue { background-color: var(--accent-soft); color: var(--accent-primary); }
.bg-green { background-color: var(--success-bg); color: var(--success); }
.bg-purple { background-color: var(--purple-bg); color: var(--purple); }
.bg-orange { background-color: var(--warning-bg); color: var(--warning); }

.stat-details {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.825rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

/* Controls Bar */
.controls-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-tabs {
    display: flex;
    background-color: var(--bg-subtle);
    padding: 4px;
    border-radius: var(--radius-md);
    gap: 2px;
}

.filter-btn {
    border: none;
    background: transparent;
    padding: 0.45rem 0.9rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn.active {
    background-color: var(--bg-surface);
    color: var(--accent-primary);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.view-options {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.device-count-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.view-toggle {
    display: flex;
    background-color: var(--bg-subtle);
    padding: 3px;
    border-radius: var(--radius-sm);
    gap: 2px;
}

.view-btn {
    border: none;
    background: transparent;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: var(--transition);
}

.view-btn.active {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

/* Devices Grid Cards */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
    gap: 1.25rem;
}

.device-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.35rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.device-card:hover {
    border-color: var(--accent-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

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

.device-type-icon {
    width: 44px;
    height: 44px;
    background-color: var(--bg-subtle);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    color: var(--text-primary);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}

.status-badge.online {
    background-color: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.status-badge.offline {
    background-color: var(--bg-subtle);
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

.device-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
}

.device-card-sub {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: monospace;
}

.device-info-list {
    margin: 1.1rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.info-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
}

.info-label {
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.info-value {
    font-weight: 500;
    color: var(--text-primary);
}

/* Battery Bar */
.battery-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.battery-bar {
    width: 45px;
    height: 8px;
    background-color: var(--bg-subtle);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.battery-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background-color: var(--success);
}

.battery-fill.medium { background-color: var(--warning); }
.battery-fill.low { background-color: var(--danger); }

/* Card Footer Actions */
.card-actions {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.btn-card {
    flex: 1;
    padding: 0.45rem 0.5rem;
    font-size: 0.8rem;
}

/* Devices Table */
.devices-table-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
}

.devices-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}

.devices-table th {
    background-color: var(--bg-subtle);
    padding: 0.85rem 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.devices-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

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

.devices-table tr:hover {
    background-color: var(--bg-subtle);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: var(--transition);
}

.modal {
    background-color: var(--bg-surface);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 580px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
    animation: modalPop 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

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

.modal-title-group {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.modal-device-icon {
    font-size: 1.75rem;
    color: var(--accent-primary);
}

.sub-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: monospace;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
}

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

.modal-body {
    padding: 1.5rem;
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.775rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
}

.detail-value {
    font-size: 0.925rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

.hidden {
    display: none !important;
}