/* ==========================================================================
   CARSERVICEPAL - OPTIMIZED CSS STRUCTURE
   Mobile-first responsive design with clear organization
   ========================================================================== */

/* ==========================================================================
   1. CSS VARIABLES & THEMES
   ========================================================================== */
:root {
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-display: 'Orbitron', sans-serif;
    
    /* Spacing Scale */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Component Properties */
    --border-radius: 8px;
    --input-height: 44px;
    --transition-speed: 0.2s;
    
    /* Brand Colors */
    --primary-color: #3B82F6;
    --primary-color-rgb: 59, 130, 246;
    --primary-color-hover: #2563eb;
    --danger-color: #ef4444;
    --danger-color-hover: #dc2626;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    
    /* Dark Theme Palette */
    --dark-bg-primary: #0f172a;
    --dark-bg-secondary: #1e293b;
    --dark-bg-tertiary: #334155;
    --dark-text-primary: #f1f5f9;
    --dark-text-secondary: #94a3b8;
    --dark-border: #334155;
    --dark-shadow-light: rgba(0, 0, 0, 0.1);
    --dark-shadow-medium: rgba(0, 0, 0, 0.3);
    
    /* Light Theme Palette */
    --light-bg-primary: #f1f5f9;
    --light-bg-secondary: #ffffff;
    --light-bg-tertiary: #e2e8f0;
    --light-text-primary: #1e293b;
    --light-text-secondary: #64748b;
    --light-border: #cbd5e1;
    --light-shadow-light: rgba(0, 0, 0, 0.05);
    --light-shadow-medium: rgba(0, 0, 0, 0.1);
}

/* Theme Application */
.dark-theme {
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-tertiary: var(--dark-bg-tertiary);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --border: var(--dark-border);
    --shadow-light: var(--dark-shadow-light);
    --shadow-medium: var(--dark-shadow-medium);
}

.light-theme {
    --bg-primary: var(--light-bg-primary);
    --bg-secondary: var(--light-bg-secondary);
    --bg-tertiary: var(--light-bg-tertiary);
    --text-primary: var(--light-text-primary);
    --text-secondary: var(--light-text-secondary);
    --border: var(--light-border);
    --shadow-light: var(--light-shadow-light);
    --shadow-medium: var(--light-shadow-medium);
}

.dark-theme .site-logo {
    filter: invert(1);
}

/* ==========================================================================
   2. RESET & BASE STYLES
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    width: 100%;
    height: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    letter-spacing: 0.5px;
    color: var(--text-primary);
}

h1 { font-size: 1.3rem; }
h2 { font-size: 1.1rem; }
h3 { font-size: 1rem; }
h4 { font-size: 0.95rem; }

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--primary-color-hover);
}

.mono {
    font-family: var(--font-mono);
}

/* ==========================================================================
   3. LAYOUT CONTAINERS
   ========================================================================== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.1rem;
}

.main-content {
    position: relative;
    padding-top: var(--spacing-md);
}

/* Background Pattern */
.main-content::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 100px,
        rgba(var(--primary-color-rgb), 0.015) 100px,
        rgba(var(--primary-color-rgb), 0.015) 101px
    );
    pointer-events: none;
    z-index: -1;
}

/* ==========================================================================
   4. HEADER COMPONENT
   ========================================================================== */
.header {
    position: relative;
    padding: 0.2rem;
    margin-bottom: 0.05rem;
    background: var(--dark-bg-primary);
    background-image: linear-gradient(145deg, var(--bg-secondary), var(--bg-primary));
    border: 1px solid var(--border);
    border-radius: 2px;
      /* var(--border-radius); */
    box-shadow: 0 8px 32px 0 rgba(0,0,0,0.37);
    overflow: hidden;
}

/* Header Animation */
.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    animation: beam-scan 8s linear infinite;
}

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

.header-content {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding-left: 2px;
}

/* Logo Section */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
}

.logo h1 {
    position: absolute;
    top: 14px;
    left: 42px;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0 1px 3px var(--shadow-medium);
    margin: 0 !important;
}

.header-slogan {
    font-size: 0.58rem;
    color: var(--text-secondary);
    margin: -0.05rem 0 0 0.4rem !important; /* compensate so slogan doesn't drop below */
}

/* Header Actions */
.header-actions {
    position: absolute;
    right: 0.2rem;
    bottom: 0.2rem;
    display: flex;
    align-items: center;
    gap: 0.12rem;
    z-index: 2;
}

.header-action-btn {
    padding: 6px 3px;
    font-size: 0.5rem;
    min-width: 25px;
    height: 25px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--bg-tertiary) 50%, transparent);
    backdrop-filter: blur(5px);
}

.header-actions .btn-text {
    display: none !important;
}

/* Header Background Graphic */
.header-background-graphic {
    position: absolute;
    top: 50%;
    /* move graphic to be ~20px away from the header actions (0.2rem + 56px button + 20px gap) */
    /* Horizontal offset controlled by JS to guarantee exact 20px gap from settings button */
    right: auto;
    transform: translateY(calc(-50% + 5px));
    width: 88px;
    height: 90%;
    background-image: url('hero-car.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: right center;
    opacity: 0.35;
    pointer-events: none;
    z-index: 0;
}

/* Header Style Variants */
.header[data-style="gradient-1"] { 
    background-image: linear-gradient(45deg, #004EF5, #6A00FF); 
}

.header[data-style="gradient-2"] { 
    background-image: linear-gradient(45deg, #FF6B6B, #FFC371); 
}

.header[data-style="gradient-3"] { 
    background-image: linear-gradient(45deg, #2AF598, #009EFD); 
}

.header[data-style="gradient-4"] { 
    background-image: linear-gradient(45deg, #434343, #000000); 
}

.header[data-style="gradient-5"] { 
    background-image: linear-gradient(45deg, #ee0979, #ff6a00); 
}

.header[data-style="themed-banner"] {
    background: #1d3c5f;
    background-image:
        radial-gradient(ellipse at top, #4a7aab, transparent 70%),
        linear-gradient(to bottom right, #2c5282, #1a365d);
    border-bottom: 3px solid #1a2b42;
    color: white;
}

/* Header Style Overrides */
.header[data-style] .logo h1,
.header[data-style] .header-slogan,
.header[data-style] .user-info {
    color: #fff;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
}

.header[data-style] .site-logo {
    filter: brightness(0) invert(1);
}

.header[data-style] .header-actions .btn-secondary {
    background-color: rgba(255,255,255,0.15);
    border-color: rgba(255,255,255,0.3);
    color: #fff;
}

.header[data-style] .header-actions .btn-secondary:hover {
    background-color: rgba(255,255,255,0.25);
}

/* ==========================================================================
   5. NAVIGATION
   ========================================================================== */
.nav-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.1rem;
    padding: 0.05rem;
    margin-top: 0.05rem;
    margin-bottom: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
}

.nav-button {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.15rem 0.15rem;
    font-size: 0.61rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 2px;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-speed);
}

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

.nav-button.active {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 0 10px rgba(var(--primary-color-rgb), 0.5);
}

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

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

.tab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
    padding-left: var(--spacing-sm);
}

.section-slogan {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin: 0.125rem 0 var(--spacing-sm) 0;
    font-weight: 500;
    line-height: 1.2;
    padding-left: var(--spacing-sm);
}

/* ==========================================================================
   6. FORMS & INPUTS
   ========================================================================== */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="date"],
textarea,
select {
    width: 100%;
    padding: 0.6rem 1rem;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* Input Heights */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="date"],
select {
    height: var(--input-height);
}

/* Select Styling */
select {
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23a0aec0%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13.2-5.4H18.2c-4.8%200-9.3%201.8-13.2%205.4A17.6%2017.6%200%200%200%200%2082.6c0%204.8%201.8%209.3%205.4%2013.2l128%20128c3.9%203.9%209.2%205.4%2013.2%205.4s9.3-1.8%2013.2-5.4l128-128c3.6-3.9%205.4-8.4%205.4-13.2%200-4.8-1.8-9.3-5.4-13.2z%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 0.8rem;
}

/* Focus States */
input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.3);
}

/* Textarea */
textarea {
    min-height: 80px;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    resize: vertical;
}

/* Form Groups */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* ==========================================================================
   7. BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.6rem 1.2rem;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition-speed);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-medium);
}

/* Button Variants */
.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    background-image: linear-gradient(to top, var(--primary-color), color-mix(in srgb, var(--primary-color) 80%, #fff));
    border: 1px solid color-mix(in srgb, var(--primary-color) 70%, #000);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 2px 4px var(--shadow-light);
}

.btn-primary:hover {
    background-color: var(--primary-color-hover);
    background-image: linear-gradient(to top, var(--primary-color-hover), color-mix(in srgb, var(--primary-color-hover) 80%, #fff));
}

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

.btn-secondary:hover {
    background-color: var(--dark-bg-tertiary);
}

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

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

/* Button Sizes */
.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.btn.two-line {
    flex-direction: column;
    padding: 0.5rem 0.9rem;
    white-space: normal;
    text-align: center;
    line-height: 1;
    gap: 0;
}

.btn-icon {
    padding: var(--spacing-sm);
    width: 36px;
    height: 36px;
    font-size: 1rem;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 50%;
    white-space: nowrap;
}

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

/* Special Button Rules */
.tab-header > .btn#addMaintenanceBtn,
.tab-header > .btn#addVehicleBtn2 {
    padding: 0.5rem 0.5rem 0.4rem 0.5rem;
    font-size: 0.6rem;
    min-width: 72px;
    max-width: 120px;
    white-space: normal;
    text-align: center;
    line-height: 1;
}

.maintenance-controls .btn,
.tab-header .btn {
    min-width: 84px;
    max-width: 160px;
}

/* ==========================================================================
   8. CARDS
   ========================================================================== */
.dashboard-card,
.ai-card,
.report-card,
.vehicle-card,
.maintenance-record {
    padding: var(--spacing-lg);
    background-color: color-mix(in srgb, var(--bg-secondary) 85%, transparent);
    border: 1px solid var(--border);
    border-top: 3px solid var(--primary-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px var(--shadow-light);
    font-size: 0.88rem;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.dashboard-card:hover,
.ai-card:hover,
.report-card:hover,
.vehicle-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 8px 12px var(--shadow-medium);
}

/* Card Header */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.card-header h3 {
    font-size: 0.98rem;
    font-weight: 700;
}

.card-header i {
    color: var(--text-secondary);
}

/* Card Background Graphics */
.dashboard-card,
.vehicle-card {
    position: relative;
    overflow: hidden;
}

.dashboard-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background-image: url('dashboard-gauge.png');
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.08;
    pointer-events: none;
}

.vehicle-card::after {
    content: '';
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background-image: url('hero-car.png');
    background-size: contain;
    background-repeat: no-repeat;
    opacity: 0.06;
    transform: rotate(-15deg);
    pointer-events: none;
}

/* Dashboard Card Scrolling */
.dashboard-card {
    display: flex;
    flex-direction: column;
    max-height: 500px;
}

.dashboard-card > div:not(.card-header) {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 10px;
}

/* ==========================================================================
   9. GRIDS
   ========================================================================== */
.dashboard-grid,
.vehicles-grid,
.ai-assistant-grid,
.reports-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

/* ==========================================================================
   10. MODALS
   ========================================================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    inset: 0;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 600px;
    margin: auto;
    padding: var(--spacing-xl);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    box-shadow: 0 10px 25px var(--shadow-medium);
    animation: slide-up 0.3s ease-out;
}

.modal-content.large {
    max-width: 800px;
}

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

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

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

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

/* ==========================================================================
   11. SPECIFIC COMPONENTS
   ========================================================================== */

/* Vehicle Components */
.vehicle-selector {
    min-width: 250px;
    margin-bottom: var(--spacing-sm);
}

.vehicle-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.vehicle-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 0;
    border: none;
    margin-bottom: var(--spacing-md);
}

.vehicle-title {
    font-weight: 600;
}

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

.vehicle-details {
    display: flex;
    gap: 2rem;
}

.vehicle-actions,
.maintenance-actions {
    display: flex;
    gap: 0.25rem;
    flex-wrap: nowrap;
    align-items: center;
}

/* Info Items */
.info-item .info-label {
    font-size: 0.72rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-item .info-value {
    font-weight: 500;
    font-size: 0.82rem;
}

/* Maintenance Components */
.maintenance-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
}

.maintenance-controls select,
#maintenanceVehicle,
#maintenanceVehicleFilter {
    flex: 1;
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.maintenance-record {
    padding: var(--spacing-lg);
}

.maintenance-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.maintenance-title-container {
    flex-grow: 1;
    min-width: 0;
}

.maintenance-title {
    font-weight: 600;
}

.maintenance-date {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

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

.maintenance-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    border-top: 1px solid var(--border);
    padding-top: var(--spacing-md);
}

.maintenance-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

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

/* AI Assistant Components */
.ai-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

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

.status-indicator.offline {
    background-color: var(--danger-color);
}

.ai-chat {
    display: flex;
    flex-direction: column;
    height: 350px;
}

.chat-messages {
    flex-grow: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.chat-message {
    padding: 0.75rem var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
    max-width: 90%;
    font-size: 0.85rem;
}

.chat-message.user {
    background-color: var(--primary-color);
    color: #fff;
    margin-left: auto;
}

.chat-message.assistant {
    background-color: var(--bg-tertiary);
}

.chat-input-container {
    display: flex;
    gap: var(--spacing-sm);
}

.chat-input-container input {
    flex-grow: 1;
}

.chat-input-container button {
    width: 44px;
    padding: 0;
}

/* Cost Components */
.cost-stat {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border);
}

.cost-value,
.info-value.cost {
    font-weight: 600;
    color: var(--success-color);
}

/* Receipt Components */
.receipt-preview {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.receipt-thumbnail {
    position: relative;
    width: 84px;
    height: 84px;
}

.receipt-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.receipt-remove {
    position: absolute;
    top: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--danger-color);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    line-height: 1;
}

/* Settings Components */
.settings-tabs {
    display: flex;
    gap: 0.2rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--spacing-lg);
}

.settings-tab {
    background: none;
    border: none;
    padding: 0.5rem 0.4rem;
    cursor: pointer;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all var(--transition-speed);
    font-size: 0.8rem;
}

.settings-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.settings-panel {
    display: none;
}

.settings-panel.active {
    display: block;
}

/* Theme Settings */
.theme-options {
    display: flex;
    gap: var(--spacing-md);
}

.theme-option {
    border: 2px solid transparent;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
}

.theme-option.active {
    border-color: var(--primary-color);
}

.theme-preview {
    width: 100px;
    height: 60px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border);
}

/* Color Settings */
.color-presets {
    display: flex;
    gap: 0.75rem;
    margin-top: var(--spacing-md);
}

.color-swatch {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: transform 0.2s;
}

.color-swatch:hover {
    transform: scale(1.1);
}

.color-picker-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

#themeColorPicker {
    appearance: none;
    width: var(--input-height);
    height: var(--input-height);
    padding: 0;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    background-color: transparent;
}

#themeColorPicker::-webkit-color-swatch {
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

#themeColorPicker::-moz-color-swatch {
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

#themeColorHex {
    width: 120px;
}

/* Header Style Settings */
.header-style-options {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.header-style-option {
    border: 2px solid transparent;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    background: none;
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.8rem;
    text-align: center;
}

.header-style-option.active {
    border-color: var(--primary-color);
}

.header-style-preview {
    width: 100px;
    height: 60px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--border);
}

/* ==========================================================================
   12. AUTH PAGES
   ========================================================================== */
#auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: var(--spacing-md);
    background-color: var(--dark-bg-primary);
}

.dark-theme #auth-container {
    background: linear-gradient(45deg, var(--dark-bg-primary), #1a2238);
}

.light-theme #auth-container {
    background: linear-gradient(45deg, #e9ecef, #f8f9fa);
}

.auth-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 900px;
    min-height: auto;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    box-shadow: 0 10px 25px var(--shadow-medium);
    overflow: hidden;
}

.auth-panel {
    flex: 1;
    padding: var(--spacing-xl);
}

.auth-branding {
    display: none;
}

.auth-form-panel {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-box {
    width: 100%;
    max-width: 400px;
    background-color: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
}

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

.auth-header h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.auth-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-md);
    text-align: center;
    font-size: 0.9rem;
    min-height: 1.2rem;
}

.auth-tab {
    flex: 1;
    padding: 0.75rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-speed);
}

.auth-tab:hover {
    color: var(--text-primary);
}

.auth-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border);
}

.auth-divider span {
    padding: 0 var(--spacing-md);
}

.auth-error {
    color: var(--danger-color);
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    min-height: 1.2rem;
}

#anonymousSaveNotice p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

#closeAuthModal {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-xl);
    z-index: 10;
}

/* Google Button */
.btn-google {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 40px;
    background-color: #131314;
    border-radius: 4px;
    border: 1px solid #8E918F;
    color: #E3E3E3;
    font-family: 'Roboto', sans-serif;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.25px;
    cursor: pointer;
    transition: background-color .3s, border-color .3s;
    padding: 0 12px;
}

.btn-google:hover {
    background-color: #2d2f31;
    border-color: #8E918F;
}

.btn-google:active {
    background-color: #3d4043;
}

.google-icon-wrapper {
    width: 18px;
    height: 18px;
    margin-right: 24px;
}

.google-button-text {
    flex-grow: 1;
    text-align: center;
    margin-left: -24px;
}

/* ==========================================================================
   13. NOTIFICATIONS & UTILITIES
   ========================================================================== */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    color: #fff;
    box-shadow: 0 5px 15px var(--shadow-medium);
    min-width: 250px;
    animation: slide-in 0.3s ease-out;
}

.toast.info { background-color: var(--primary-color); }
.toast.success { background-color: var(--success-color); }
.toast.warning { background-color: var(--warning-color); color: var(--dark-text-primary); }
.toast.error { background-color: var(--danger-color); }

@keyframes slide-in {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.loading-overlay {
    display: none;
    position: fixed;
    z-index: 3000;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
    text-align: center;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    color: #fff;
    font-size: 1.2rem;
}

.loading-spinner i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

/* Empty States */
.no-data,
.no-vehicle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl) 0;
    font-style: italic;
}

.empty-state-graphic {
    width: 80px;
    height: 80px;
    opacity: 0.3;
    margin-bottom: var(--spacing-md);
    filter: grayscale(0.5);
}

/* Viewport Indicator */
.viewport-indicator {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.6);
    color: #fff;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.8rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.viewport-indicator.show {
    opacity: 0;
}

/* Greeting Banner */
.greeting-banner {
    padding: 0.25rem var(--spacing-sm);
    margin-top: -0.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

.greeting-banner p {
    margin: 0;
}

.greeting-banner strong {
    color: var(--primary-color);
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-right: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Troubleshooting Results */
.troubleshooting-results {
    margin-top: var(--spacing-lg);
}

/* ==========================================================================
   14. RESPONSIVE DESIGN
   ========================================================================== */

/* TABLET - 768px and up */
@media (min-width: 768px) {
    /* Container */
    .app-container {
          padding: 0.1rem;
        /* padding: var(--spacing-sm); */
    }
    
    /* Typography Scale */
    h1 { font-size: 1.5rem; }
    
    /* Header Adjustments */
    .header {
        padding: 0.2rem;
    }
    
    .header-content {
        padding-left: 4px;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .logo img {
        height: 35px;
        margin: 10px 0 0 2px;
    }
    
    .header-slogan {
        font-size: 0.58rem;
        color: var(--text-secondary);
        margin: -0.05rem 0 0 0.4rem !important; /* compensate so slogan doesn't drop below */
    }
    
    .section-slogan {
        font-size: 0.78rem;
    }
    
    .header-actions {
        right: 0.4rem;
        bottom: 0.7rem;
        gap: 0.18rem;
    }
    
    .header-action-btn {
        padding: 0.3rem;
        font-size: 0.7rem;
        height: 25px;
    }
    
    .header-background-graphic {
        width: 300px;
        right: 120px;
        opacity: 0.28;
    }
    
    /* Navigation */
    .nav-tabs {
        gap: 0.25rem;
    }
    
    .nav-button {
        padding: 0.2rem 0.28rem;
        font-size: 0.7rem;
        border-radius: 3px;
    }
    
    /* Forms */
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    /* Cards Typography */
    .dashboard-card,
    .vehicle-card,
    .report-card,
    .maintenance-record,
    .ai-card {
        font-size: 0.88rem;
    }
    
    .card-header h3,
    .vehicle-title,
    .maintenance-title {
        font-size: 0.98rem;
    }
    
    .info-item .info-label {
        font-size: 0.72rem;
    }
    
    .info-item .info-value,
    .maintenance-meta,
    .maintenance-date {
        font-size: 0.82rem;
    }
    
    /* Grids remain single column */
    .dashboard-grid,
    .vehicles-grid,
    .ai-assistant-grid,
    .reports-grid {
        grid-template-columns: 1fr;
    }
    
    /* Components */
    .receipt-thumbnail {
        width: 84px;
        height: 84px;
    }
    
    .empty-state-graphic {
        width: 80px;
        height: 80px;
    }
    
    .vehicle-card::after {
        width: 100px;
        height: 100px;
    }
    
    /* Auth */
    .auth-wrapper {
        flex-direction: column;
        min-height: auto;
    }
    
    .auth-branding {
        display: none;
    }
    
    .auth-panel {
        padding: var(--spacing-xl);
    }
    
    /* Button Text Hiding */
    .tab-header .btn .btn-text,
    .maintenance-controls .btn .btn-text {
        display: none;
    }
    
    .tab-header .btn,
    .maintenance-controls .btn {
        padding: 0.3rem;
        font-size: 0.5rem;
    }
    
    /* Select Adjustments */
    .dashboard-header .vehicle-selector select,
    .maintenance-controls select,
    .report-controls select,
    .troubleshooting-form select {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
        background-position: right 0.6rem center;
        background-size: 0.7rem;
    }
}

/* DESKTOP - 1024px and up */
@media (min-width: 1024px) {
    /* Container */
    .app-container {
        /* padding: var(--spacing-sm); */
    padding: 0.1rem;
    }
    
    /* Typography Scale */
    h1 { font-size: 1.5rem; }
    
    /* Header */
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .logo img {
        height: 35px;
        margin: 10px 0 0 4px;
    }
    
    .header-content {
        padding-left: 4px;
    }
    
    .header-slogan {
        font-size: 0.58rem;
        margin: 0.3rem 0 0 0.1rem;
    }
    
    .section-slogan {
        font-size: 0.98rem;
    }
    
    .header-actions {
        right: 0.4rem;
        bottom: 0.7rem;
        gap: 0.02rem;
    }
    
    .header-actions .btn-text {
        display: none;
    }
    
    .header-action-btn {
        padding: 0.25rem;
        font-size: 0.7rem;
        min-width: 25px;
        height: 25px;
    }
    
    .header-background-graphic {
        width: 360px;
        right: 96px;
        opacity: 0.28;
    }
    
    /* Navigation */
    .nav-tabs {
        gap: var(--spacing-sm);
    }
    
    .nav-button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8rem;
    }
    
    /* Forms */
    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    /* Full Size Typography Restoration */
    .dashboard-card,
    .vehicle-card,
    .report-card,
    .maintenance-record,
    .ai-card {
        font-size: 1rem;
    }
    
    .card-header h3,
    .vehicle-title,
    .maintenance-title {
        font-size: 1rem;
    }
    
    .info-item .info-label {
        font-size: 0.8rem;
    }
    
    .info-item .info-value,
    .maintenance-meta,
    .maintenance-date,
    .cost-value {
        font-size: 1rem;
    }
    
    /* Multi-column Grids */
    .dashboard-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
    
    .vehicles-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .ai-assistant-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .reports-grid {
        grid-template-columns: 2fr 1fr;
    }
    
    /* Components Scale Up */
    .chat-message {
        max-width: 80%;
        font-size: 1rem;
    }
    
    .receipt-thumbnail {
        width: 100px;
        height: 100px;
    }
    
    .empty-state-graphic {
        width: 120px;
        height: 120px;
    }
    
    .vehicle-card::after {
        width: 150px;
        height: 150px;
    }
    
    /* Auth Layout */
    .auth-wrapper {
        flex-direction: row;
        min-height: 600px;
    }
    
    .auth-branding {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
        background: linear-gradient(135deg, var(--primary-color), var(--primary-color-hover));
        color: #fff;
    }
    
    .auth-branding .site-logo {
        height: 80px;
        margin-bottom: var(--spacing-lg);
        filter: brightness(0) invert(1);
    }
    
    .auth-branding h1 {
        font-size: 2rem;
        color: #fff;
        margin-bottom: var(--spacing-md);
        font-family: var(--font-display);
    }
    
    .auth-branding p {
        color: rgba(255, 255, 255, 0.8);
        max-width: 300px;
    }
    
    .auth-branding .illustration {
        font-size: 8rem;
        margin-top: 3rem;
        color: rgba(255, 255, 255, 0.2);
    }
    
    .auth-panel {
        padding: 3rem;
    }
    
    /* Restore Button Text */
    .tab-header .btn .btn-text,
    .maintenance-controls .btn .btn-text {
        display: inline;
    }
    
    .tab-header .btn,
    .maintenance-controls .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
    
    /* Restore Select Sizing */
    .dashboard-header .vehicle-selector select,
    .maintenance-controls select,
    .report-controls select,
    .troubleshooting-form select {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        background-position: right 0.75rem center;
        background-size: 0.8rem;
    }
    
    /* Settings */
    .settings-tabs {
        gap: var(--spacing-sm);
    }
    
    .settings-tab {
        padding: 0.75rem var(--spacing-md);
        font-size: 1rem;
    }
}

/* LARGE DESKTOP - 1200px and up */
@media (min-width: 1200px) {
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .header-background-graphic {
        width: 500px;
        right: 96px;
        opacity: 0.35;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .header-slogan {
        font-size: 0.58rem;
    }
}