/* ===================================
   CC Cardio Dashboard Styles
   Dark Theme Medical-Grade Design
   =================================== */

/* CSS Variables - CC Cardio Design System */
:root {
    /* Colors */
    --primary: #0A84FF;
    --primary-hover: #0077ED;
    --secondary: #5E5CE6;
    --secondary-hover: #5452D9;
    --accent: #FF453A;
    --accent-hover: #FF3B30;
    --success: #30D158;
    --warning: #FF9F0A;

    /* Backgrounds */
    --bg-primary: #000000;
    --bg-secondary: #1C1C1E;
    --bg-tertiary: #2C2C2E;
    --bg-elevated: #3A3A3C;

    /* Text */
    --text-primary: #FFFFFF;
    --text-secondary: #98989D;
    --text-tertiary: #636366;

    /* Borders */
    --border-color: #38383A;
    --border-radius: 12px;
    --border-radius-small: 8px;
    --border-radius-large: 16px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;

    /* Effects */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --blur-amount: 20px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Layout */
    --sidebar-width: 320px;
    --header-height: 80px;
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   Login Screen
   =================================== */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #000000 0%, #1C1C1E 100%);
    padding: var(--spacing-lg);
}

.login-card {
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    padding: var(--spacing-2xl);
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    margin: 0 auto var(--spacing-md);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.9; transform: scale(1.05); }
}

.login-header h1 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(10, 132, 255, 0.2);
}

.form-group input::placeholder {
    color: var(--text-tertiary);
}

.error-message {
    color: var(--accent);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm);
    background: rgba(255, 69, 58, 0.1);
    border-radius: var(--border-radius-small);
    border: 1px solid rgba(255, 69, 58, 0.3);
    display: none;
}

.error-message.show {
    display: block;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(10, 132, 255, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-elevated);
    border-color: var(--text-tertiary);
}

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

.btn-text:hover:not(:disabled) {
    background: rgba(10, 132, 255, 0.1);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
    width: 100%;
}

.btn-icon {
    padding: var(--spacing-sm);
    width: 40px;
    height: 40px;
}

.btn-loader {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.btn-group {
    display: inline-flex;
    gap: var(--spacing-xs);
}

.btn-group .btn {
    border-radius: var(--border-radius-small);
}

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

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    overflow: hidden;
    z-index: 100;
    transition: transform var(--transition-base);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.logo-small {
    flex-shrink: 0;
}

.sidebar-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.search-box {
    position: relative;
    padding: 0 var(--spacing-lg);
    margin: var(--spacing-md) 0;
}

.search-icon {
    position: absolute;
    left: calc(var(--spacing-lg) + var(--spacing-md));
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
}

.patient-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm) var(--spacing-md);
}

.patient-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.patient-item:hover {
    background: var(--bg-tertiary);
}

.patient-item.active {
    background: rgba(10, 132, 255, 0.15);
    border-color: var(--primary);
}

.patient-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-lg);
    color: var(--primary);
    flex-shrink: 0;
}

.patient-info {
    flex: 1;
    min-width: 0;
}

.patient-name {
    font-weight: 500;
    font-size: var(--font-size-sm);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.patient-id {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.patient-status {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.patient-status.online {
    background: var(--success);
    box-shadow: 0 0 8px var(--success);
}

.patient-status.offline {
    background: var(--text-tertiary);
}

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

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.dashboard-header {
    height: var(--header-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: blur(var(--blur-amount));
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
}

.dashboard-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 600;
}

.device-id {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-small);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    white-space: nowrap;
}

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

.tab-btn.active {
    color: var(--primary);
    background: rgba(10, 132, 255, 0.15);
}

/* Tab Content */
.tab-content {
    flex: 1;
    padding: var(--spacing-xl);
    overflow-y: auto;
}

.tab-pane {
    display: none;
    animation: fadeIn var(--transition-base);
}

.tab-pane.active {
    display: block;
}

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

/* ===================================
   Cards & Metrics
   =================================== */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    backdrop-filter: blur(var(--blur-amount));
    box-shadow: var(--shadow-sm);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.card-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.chart-unit {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-small);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
}

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

.metric-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.metric-content {
    flex: 1;
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.metric-value {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.metric-change {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

.metric-change.positive {
    color: var(--success);
}

.metric-change.negative {
    color: var(--accent);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
}

/* Alerts List */
.alerts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.alert-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--accent);
}

.alert-item.warning {
    border-left-color: var(--warning);
}

.alert-item.info {
    border-left-color: var(--primary);
}

.alert-icon {
    flex-shrink: 0;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.alert-time {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* Status List */
.status-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.status-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
}

.status-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.status-value {
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.status-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.status-badge.success {
    background: rgba(48, 209, 88, 0.2);
    color: var(--success);
}

.status-badge.warning {
    background: rgba(255, 159, 10, 0.2);
    color: var(--warning);
}

.status-badge.error {
    background: rgba(255, 69, 58, 0.2);
    color: var(--accent);
}

/* ===================================
   Charts
   =================================== */
.controls-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.control-group label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
}

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

.chart-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.chart-card {
    min-height: 400px;
}

.chart-container {
    position: relative;
    height: 300px;
}

.chart-container canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ===================================
   Battery Tab
   =================================== */
.battery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.battery-gauge-card {
    display: flex;
    flex-direction: column;
}

.battery-gauge-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) 0;
    position: relative;
}

#battery-gauge {
    max-width: 250px;
    max-height: 250px;
}

.battery-info {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.battery-percentage {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.battery-health {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.battery-time {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* Table */
.table-container {
    overflow-x: auto;
}

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

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

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

.data-table td {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: var(--font-size-sm);
}

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

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

/* ===================================
   Faults Tab
   =================================== */
.faults-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.fault-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.fault-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.fault-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.fault-title {
    font-weight: 500;
    font-size: var(--font-size-base);
}

.fault-badges {
    display: flex;
    gap: var(--spacing-sm);
}

.severity-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-small);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.severity-badge.critical {
    background: rgba(255, 69, 58, 0.2);
    color: var(--accent);
}

.severity-badge.warning {
    background: rgba(255, 159, 10, 0.2);
    color: var(--warning);
}

.severity-badge.info {
    background: rgba(10, 132, 255, 0.2);
    color: var(--primary);
}

.fault-description {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.fault-meta {
    display: flex;
    gap: var(--spacing-lg);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

/* ===================================
   3D Model Tab
   =================================== */
.model-container {
    position: relative;
    height: calc(100vh - var(--header-height) - 120px);
    display: flex;
    gap: var(--spacing-lg);
}

.viewer-canvas {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.model-controls {
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.control-hint {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.control-hint p {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.control-hint p:last-child {
    margin-bottom: 0;
}

.control-hint strong {
    color: var(--text-primary);
}

.model-legend {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.model-legend h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

#device-markers-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.device-marker-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.marker-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
    box-shadow: 0 0 8px currentColor;
}

.device-info-panel {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    max-width: 280px;
    backdrop-filter: blur(var(--blur-amount));
    box-shadow: var(--shadow-lg);
}

.device-info-panel h4 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.device-info-panel p {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   Modal
   =================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.show {
    display: flex;
    animation: fadeIn var(--transition-base);
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

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

.modal-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 28px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-small);
    transition: all var(--transition-fast);
}

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

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* CSV Import */
.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(10, 132, 255, 0.05);
}

.upload-area.drag-over {
    border-color: var(--primary);
    background: rgba(10, 132, 255, 0.1);
}

.upload-area svg {
    margin-bottom: var(--spacing-md);
}

.upload-area p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.progress-container {
    padding: var(--spacing-lg) 0;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width var(--transition-base);
    border-radius: 4px;
}

#csv-progress-text {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ===================================
   Loading & Toast
   =================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(10, 132, 255, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: var(--spacing-md);
}

.loading-overlay p {
    color: var(--text-primary);
    font-size: var(--font-size-base);
}

.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    min-width: 300px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(var(--blur-amount));
    pointer-events: all;
    animation: slideIn var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

@keyframes slideIn {
    from { transform: translateX(400px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--accent);
}

.toast.info {
    border-left: 3px solid var(--primary);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 500;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.toast-message {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

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

    .menu-toggle {
        display: flex;
    }

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

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

    .model-controls {
        width: 100%;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 24px;
        --spacing-2xl: 32px;
    }

    .tab-content {
        padding: var(--spacing-md);
    }

    .dashboard-header {
        padding: 0 var(--spacing-md);
    }

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

    .controls-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        flex-wrap: wrap;
    }

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

/* ===================================
   Accessibility
   =================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

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

/* Print Styles */
@media print {
    .sidebar,
    .dashboard-header,
    .tab-nav,
    .controls-bar,
    .btn {
        display: none !important;
    }

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

    .card {
        break-inside: avoid;
    }
}