:root {
    /* Colors */
    --primary-color: rgb(50, 136, 207); /* Electric blue */
    --primary-light: rgba(50, 136, 207, 0.1);
    --secondary-color: rgb(183, 43, 43); /* Dark red */
    --background-color: #F5F5F5; /* Light grey */
    --text-color: #212121; /* Dark grey */
    --accent-color: rgb(64, 191, 92); /* Energy green */
    --card-bg: #FFFFFF;
    --border-color: #E0E0E0;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #F44336;
    
    /* Spacing */
    --spacing: 16px;
    --spacing-sm: 8px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Typography */
    --font-family: 'Roboto', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    
    /* Border Radius */
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* Dark Mode */
.dark-mode {
    --primary-color: rgb(70, 150, 215); /* Lighter electric blue for dark mode */
    --primary-light: rgba(70, 150, 215, 0.2);
    --background-color: #121212;
    --text-color: #F5F5F5;
    --card-bg: #1E1E1E;
    --border-color: #333333;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    transition: var(--transition);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    margin-bottom: var(--spacing);
}

h1 {
    font-size: var(--font-size-xl);
}

h2 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing);
}

/* Header */
header {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 10;
    height: 60px;
}

#theme-toggle {
    background: none;
    border: none;
    color: white;
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#theme-toggle .fa-sun {
    display: none;
}

.dark-mode #theme-toggle .fa-sun {
    display: block;
}

.dark-mode #theme-toggle .fa-moon {
    display: none;
}

/* Main Content */
main {
    flex: 1;
    padding: var(--spacing);
    padding-bottom: calc(var(--spacing) + 60px); /* Account for the nav bar */
    overflow-y: auto;
    max-width: 768px;
    margin: 0 auto;
    width: 100%;
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: var(--spacing);
    margin-bottom: var(--spacing);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

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

/* Forms */
.form-group {
    margin-bottom: var(--spacing);
}

.flex-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    background-color: var(--card-bg);
    color: var(--text-color);
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.checkbox-group {
    display: flex;
    align-items: center;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: var(--spacing-sm);
}

.checkbox-group label {
    margin-bottom: 0;
}

/* Sliders */
.slider-group {
    margin-bottom: var(--spacing-lg);
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    height: 12px;
    border-radius: 6px;
    background: linear-gradient(to right, var(--secondary-color), #FFA500, var(--accent-color));
    outline: none;
    -webkit-transition: .2s;
    transition: var(--transition);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: white;
    cursor: pointer;
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    position: relative;
    z-index: 2;
}

.slider::-moz-range-thumb {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: white;
    cursor: pointer;
    border: 2px solid var(--primary-color);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    position: relative;
    z-index: 2;
}

/* Buttons */
.btn {
    padding: 12px 16px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn i {
    margin-right: var(--spacing-sm);
}

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

.btn-primary:hover {
    background-color: rgba(50, 136, 207, 0.9);
}

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

.btn-secondary:hover {
    background-color: #D0D0D0;
}

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

.btn-danger:hover {
    background-color: rgba(183, 43, 43, 0.9);
}

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

.btn-accent:hover {
    background-color: rgba(64, 191, 92, 0.9);
}

/* Navigation */
nav {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    position: fixed;
    bottom: 0;
    width: 100%;
    box-shadow: var(--shadow);
    z-index: 10;
}

.tab-btn {
    flex: 1;
    border: none;
    background-color: transparent;
    color: var(--text-color);
    padding: var(--spacing);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    outline: none; /* Remove outline on focus */
}

.tab-btn i {
    font-size: var(--font-size-lg);
    margin-bottom: 4px;
}

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

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Summary Section */
.summary-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing);
}

.summary-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.summary-label {
    font-size: var(--font-size-sm);
    color: #757575;
}

.summary-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
}

/* Charging Preview Section */
.session-preview {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing);
    background-color: var(--primary-light);
    border-left: 4px solid var(--primary-color);
}

.session-preview h3 {
    font-size: var(--font-size-md);
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.preview-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing);
}

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

.preview-label {
    font-size: var(--font-size-sm);
    color: #757575;
}

.preview-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--primary-color);
}

/* History Items */
.history-item {
    padding: var(--spacing);
    border-bottom: 1px solid var(--border-color);
}

.history-item:last-child {
    border-bottom: none;
}

.history-item-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.history-item-title {
    font-weight: 500;
}

.history-item-date {
    color: #757575;
    font-size: var(--font-size-sm);
}

.history-item-details {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.history-item-detail {
    font-size: var(--font-size-sm);
    margin-bottom: 4px;
    padding: 6px;
    border-radius: var(--border-radius-sm);
    background-color: rgba(0, 0, 0, 0.03);
    transition: var(--transition);
}

.dark-mode .history-item-detail {
    background-color: rgba(255, 255, 255, 0.05);
}

.history-item-detail:hover {
    background-color: rgba(50, 136, 207, 0.1);
}

.history-item-detail span {
    font-weight: 500;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.history-item-detail strong {
    color: var(--primary-color);
    font-size: 1.1em;
}

.net-energy {
    font-size: 0.85em;
    font-weight: normal;
    opacity: 0.75;
    margin-left: 4px;
    font-style: italic;
}

.history-item-actions {
    margin-top: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-sm);
}

/* Vehicle Items */
.vehicle-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing);
    border-bottom: 1px solid var(--border-color);
}

.vehicle-item:last-child {
    border-bottom: none;
}

.vehicle-info {
    flex: 1;
}

.vehicle-name {
    font-weight: 500;
}

.vehicle-battery {
    font-size: var(--font-size-sm);
    color: #757575;
}

.vehicle-default {
    background-color: var(--primary-light);
    color: var(--primary-color);
    font-size: var(--font-size-sm);
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: var(--spacing-sm);
}

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

/* Filters */
.filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing);
    margin-bottom: var(--spacing);
    padding: var(--spacing);
    background-color: var(--background-color);
    border-radius: var(--border-radius-sm);
}

/* Filtered Summary */
.filtered-summary {
    margin: var(--spacing) 0;
    padding: var(--spacing);
    background-color: var(--primary-light);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.filtered-summary h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

/* Export Buttons */
.export-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

#export-monthly-pdf {
    margin-right: 0;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 70px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 20;
    pointer-events: none;
}

.toast {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing);
    margin-bottom: var(--spacing);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 400px;
    display: flex;
    align-items: center;
    animation: toast-in 0.3s, toast-out 0.3s 2.7s;
    animation-fill-mode: forwards;
    position: relative;
    overflow: hidden;
    pointer-events: auto;
}

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

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

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

.toast-icon {
    margin-right: var(--spacing);
    font-size: 1.25rem;
}

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

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

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

.toast-message {
    flex: 1;
    color: var(--text-color);
}

.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background-color: rgba(0, 0, 0, 0.1);
    animation: toast-progress 3s linear;
}

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

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

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

@keyframes toast-in {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes toast-out {
    from {
        transform: translateY(0);
        opacity: 1;
    }
    to {
        transform: translateY(100%);
        opacity: 0;
    }
}

@keyframes toast-progress {
    from {
        width: 100%;
    }
    to {
        width: 0%;
    }
}

/* Modal - Keeping a reduced version for compatibility */
.modal {
    display: none;
    position: fixed;
    z-index: 20;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
}

.modal-header, .modal-body, .modal-footer {
    padding: var(--spacing);
}

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

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing);
    color: #757575;
    font-style: italic;
}

/* Responsive Design */
@media screen and (min-width: 768px) {
    header {
        padding: var(--spacing) var(--spacing-xl);
    }
    
    main {
        padding: var(--spacing-lg);
        padding-bottom: calc(var(--spacing-lg) + 60px);
    }
    
    .card {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }
    
    .summary-content {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Mobile Layout Adjustments */
@media screen and (max-width: 480px) {
    .history-item-details {
        grid-template-columns: 1fr;
    }
    
    .history-item-detail {
        margin-bottom: 4px;
    }
}

/* Accessibility */
:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Remove outline completely for navigation buttons */
.tab-btn:focus,
.tab-btn:active,
.tab-btn:visited,
.tab-btn {
    outline: none !important;
    box-shadow: none !important;
    -webkit-tap-highlight-color: transparent !important;
    border: none !important;
}

/* Print Styles */
@media print {
    nav, header, .card-header button, .history-item-actions {
        display: none !important;
    }
    
    body {
        background-color: white;
        color: black;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #CCC;
        break-inside: avoid;
    }
    
    main {
        padding: 0;
    }
}