/* ==========================================================================
   1. VARIABLES
   ========================================================================== */
:root {
    /* Fonts */
    --font-primary: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-display: 'Orbitron', sans-serif;

    /* Dark Theme (Default) */
    --dark-bg-primary: #0f172a; /* Slate 900 */
    --dark-bg-secondary: #1e293b; /* Slate 800 */
    --dark-bg-tertiary: #334155; /* Slate 700 */
    --dark-text-primary: #f1f5f9; /* Slate 100 */
    --dark-text-secondary: #94a3b8; /* Slate 400 */
    --dark-border-color: #334155; /* Slate 700 */
    --dark-shadow-light: rgba(0, 0, 0, 0.1);
    --dark-shadow-medium: rgba(0, 0, 0, 0.3);

    /* Light Theme */
    --light-bg-primary: #f1f5f9; /* Slate 100 */
    --light-bg-secondary: #ffffff; /* White */
    --light-bg-tertiary: #e2e8f0; /* Slate 200 */
    --light-text-primary: #1e293b; /* Slate 800 */
    --light-text-secondary: #64748b; /* Slate 500 */
    --light-border-color: #cbd5e1; /* Slate 300 */
    --light-shadow-light: rgba(0, 0, 0, 0.05);
    --light-shadow-medium: rgba(0, 0, 0, 0.1);

    /* Shared 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;

    /* Sizing & Radius */
    --border-radius: 8px;
    --input-height: 44px;
    --transition-speed: 0.2s;
}

/* Light Theme overrides */
.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-color);
    --shadow-light: var(--light-shadow-light);
    --shadow-medium: var(--light-shadow-medium);
}

.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-color);
    --shadow-light: var(--dark-shadow-light);
    --shadow-medium: var(--dark-shadow-medium);
}

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

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

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

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

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

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.1rem; }
h4 { font-size: 1rem; }

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

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

/* ==========================================================================
   3. LAYOUT & STRUCTURE
   ========================================================================== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
}

#auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
    background-color: var(--dark-bg-primary); /* Use dark bg for auth page on both themes */
}

.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;
    width: 100%;
    max-width: 900px;
    min-height: 600px;
    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: 3rem;
}

.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: 1.5rem;
    filter: brightness(0) invert(1);
}

.auth-branding h1 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 1rem;
    font-family: var(--font-display);
}

.auth-branding p {
    color: rgba(255, 255, 255, 0.8);
    max-width: 300px;
}

#anonymousSaveNotice p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.auth-branding .illustration {
    font-size: 8rem;
    margin-top: 3rem;
    color: rgba(255, 255, 255, 0.2);
}

.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: 1.5rem;
}

.auth-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

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

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
    text-align: center;
    margin-top: 1rem;
    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-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.5rem 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 1rem;
}

.google-btn {
    width: 100%;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.google-btn i {
    color: #DB4437;
    font-size: 1.2rem;
}

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

.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; /* Center text by offsetting icon margin */
}

.auth-form {
    display: none;
}

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

.auth-error {
    color: var(--danger-color);
    text-align: center;
    margin-top: 1rem;
    font-size: 0.9rem;
    min-height: 1.2rem;
}

.header {
    background: var(--dark-bg-primary);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    background-image: linear-gradient(145deg, var(--bg-secondary), var(--bg-primary));
    box-shadow: 0 8px 32px 0 rgba(0,0,0,0.37);
}

.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[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; /* Fallback */
    background-image:
        radial-gradient(ellipse at top, #4a7aab, transparent 70%),
        linear-gradient(to bottom right, #2c5282, #1a365d);
    border-bottom: 3px solid #1a2b42;
    position: relative;
    color: white;
}

.header[data-style="themed-banner"] .logo h1,
.header[data-style="themed-banner"] .header-slogan {
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.6);
}

.header[data-style="themed-banner"] .header-slogan {
     color: #e2e8f0;
     text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

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

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

/* When a gradient is applied, text colors need to be white for readability */
.header[data-style] .logo h1,
.header[data-style] .header-slogan,
.header[data-style] .user-info span,
.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);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-right: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.header-slogan {
    font-size: .88rem;
    padding: 0px 0px 0px 0px;
    color: var(--text-secondary);
    margin: 1rem 0 0 1rem; /* Adjust padding to match logo/h1 left alignment */
}

.greeting-banner {
    padding: 0.25rem 0.5rem;
    margin-top: -0.5rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}
.greeting-banner p {
    margin: 0;
}
.greeting-banner strong {
    color: var(--primary-color);
}

.section-slogan {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0.125rem 0 0.5rem 0;
    font-weight: 500;
    line-height: 1.2;
    /* match heading left offset so description aligns with controls */
    padding-left: 0.5rem;
}

/* Desktop: slightly larger description for improved readability */
@media (min-width: 993px) {
    .section-slogan {
        font-size: 0.98rem; /* a bit bigger on desktop */
    }
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.50rem;
}

.logo img {
    height: 50px;
    margin: 0px 0px 0px 15px;
}

.logo h1 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--primary-color);
    text-shadow: 0px 1px 3px var(--shadow-medium);
}

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

.nav-tabs {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping */
    justify-content: flex-start; /* Align tabs to the start */
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.25rem;
    border-radius: var(--border-radius);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    /* Removed overflow-x and scrollbar-width rules as items will now wrap */
}

.main-content {
    padding-top: 1rem;
}

.tab-content {
    display: none;
}

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

.tab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
    /* tiny left padding so h2 lines up with selects/controls below */
    padding-left: 0.5rem;
}

/* ==========================================================================
   4. COMPONENTS
   ========================================================================== */
/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
    text-decoration: none;
    white-space: nowrap; /* keep default buttons single-line unless explicitly allowed */
}

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

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

.btn-secondary:hover {
    background-color: var(--dark-bg-tertiary); /* Darkens slightly on both themes */
}

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

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

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

/* Ensure small header/button variants can show explicit two-line labels (centered) */
.btn.two-line {
    white-space: normal;      /* allow explicit line breaks */
    text-align: center;
    line-height: 1;          /* tighten lines so two words sit comfortably */
    padding: 0.5rem 0.9rem;  /* keep compact */
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 0;                  /* no extra gap between lines */
}

/* Make icon-only buttons unchanged */
.btn-icon {
    white-space: nowrap;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    padding: 0.5rem;
    border-radius: 50%;
    width: 36px;
    height: 36px;
}
.btn-icon:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Navigation Buttons */
.nav-button {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    border: none;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
    transition: all var(--transition-speed);
    position: relative;
}

.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);
}

/* Header Action Buttons (Specific styling for header buttons) */
.header-action-btn {
    background: color-mix(in srgb, var(--bg-tertiary) 50%, transparent);
    backdrop-filter: blur(5px);
}

/* Cards */
.dashboard-card, .ai-card, .report-card, .vehicle-card, .maintenance-record {
    background-color: color-mix(in srgb, var(--bg-secondary) 85%, transparent);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px var(--shadow-light);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border-top: 3px solid var(--primary-color);
}

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

.card-header h3 {
    font-size: 1rem;
    font-weight: 700;
}

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

.no-data, .no-vehicle {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem 0;
    font-style: italic;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    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 {
    background-color: var(--bg-secondary);
    margin: auto;
    padding: 2rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 600px;
    box-shadow: 0 10px 25px var(--shadow-medium);
    position: relative;
    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: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.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);
}

#closeAuthModal {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    z-index: 10;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="date"],
textarea {
    width: 100%;
    padding: 0 1rem;
    height: var(--input-height);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

select {
    width: 100%;
    padding: 0.6rem 1rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.9rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
    appearance: none;
    -webkit-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;
}

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 {
    height: auto;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.toast {
    padding: 1rem 1.5rem;
    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 */
.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: 1rem;
}

/* ==========================================================================
   5. PAGE-SPECIFIC STYLES
   ========================================================================== */

/* Dashboard */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}
@media (min-width: 1200px) {
    .dashboard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.dashboard-card {
    display: flex;
    flex-direction: column;
    max-height: 500px; /* Max height for cards */
}

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

.vehicle-selector {
    min-width: 250px;
    margin-bottom: 0.5rem; /* add a small space below the dashboard's selection dropdown */
}
.vehicle-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.info-item .info-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.info-item .info-value {
    font-weight: 500;
}

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

/* Vehicles Tab */
.vehicles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}
.vehicle-card {
    cursor: pointer;
}
.vehicle-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 0;
    border: none;
    margin-bottom: 1rem;
}
.vehicle-title { font-weight: 600; }
.vehicle-year { font-size: 0.9rem; color: var(--text-secondary); }
.vehicle-details { display: flex; gap: 2rem; }

/* Maintenance Tab */
.maintenance-controls {
    display: flex;
    gap: 1rem;
    align-items: center; /* Align items in maintenance controls */
}
.maintenance-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.maintenance-record {
    padding: 1.5rem;
}
.maintenance-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 1rem;
}
.maintenance-title-container {
    flex-grow: 1;
    min-width: 0; /* Allows content to shrink */
}
.maintenance-title {
    font-weight: 600;
    /* flex-grow: 1; (Moved to container) */
}
.maintenance-description-snippet {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%;
}
.maintenance-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}
.maintenance-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
}
.maintenance-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}

/* AI Assistant */
.ai-assistant-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}
.ai-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.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: 1rem;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}
.chat-message {
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
    max-width: 80%;
}
.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: 0.5rem;
}
.chat-input-container input { flex-grow: 1; }
.chat-input-container button { width: 44px; padding: 0; }

.troubleshooting-results {
    margin-top: 1.5rem;
}

/* Settings */
.settings-tabs {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
}
.settings-tab {
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    cursor: pointer;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all var(--transition-speed);
}
.settings-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}
.settings-panel { display: none; }
.settings-panel.active { display: block; }

.color-presets {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.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 {
    -webkit-appearance: none;
    -moz-appearance: none;
    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;
}

.theme-options {
    display: flex;
    gap: 1rem;
}
.theme-option {
    border: 2px solid transparent;
    padding: 0.5rem;
    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: 0.5rem;
    border: 1px solid var(--border);
}

.header-style-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.header-style-option {
    border: 2px solid transparent;
    padding: 0.5rem;
    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: 0.5rem;
    border: 1px solid var(--border);
}

/* Reports Tab */
.reports-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}
.cost-stat {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}
.cost-value, .info-value.cost {
    font-weight: 600;
    color: var(--success-color);
}

/* Receipt Previews */
.receipt-preview {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}
.receipt-thumbnail {
    position: relative;
    width: 100px;
    height: 100px;
}
.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;
}

/* ==========================================================================
   6. RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 992px) {
    .dashboard-grid, .ai-assistant-grid, .reports-grid {
        grid-template-columns: 1fr;
    }

    .auth-wrapper {
        flex-direction: column;
        min-height: auto;
    }

    .auth-branding {
        display: none; /* Hide branding panel on smaller screens for simplicity */
    }

    .auth-panel {
        padding: 2rem;
    }
}
/* ============================================================================== */

@media (max-width: 768px) {
    .app-container {
        padding: .1rem;
    }
    .header-content {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    /* Slightly reduce description size on small screens */
    .section-slogan {
        font-size: 0.78rem;
      
    }
    .logo h1 {
        font-size: 1.5rem;
    }
    .logo img {
        height: 40px;
        margin: 0px 0px 0px 0px;
    }
.header-slogan {
    font-size: .77rem;
    padding: 0px 0px 0px 0px;
    color: var(--text-secondary);
    margin: 0.5rem 0.0rem 0.0rem 0.1rem; /* Adjust padding to match logo/h1 left alignment */
    }
    
    .header-actions {
        gap: 0.25rem; /* Reduce gap between header buttons */
    }
    .header-actions .header-action-btn {
        padding: 0.5rem 0.6rem; /* Smaller padding for header buttons */
        font-size: 0.9rem; /* Smaller icons in header buttons */
    }
    .header-actions .btn-text {
        display: none; /* Hides text for all header action buttons if they have any */
    }

    .nav-tabs {
        gap: 0.25rem; /* Smaller gap for nav tabs */
    }
    .nav-button {
        padding: 0.2rem 0.28rem;
        border-radius: 3px;
        font-size: 0.7rem;
    }
    .form-grid {
        grid-template-columns: 1fr;
    }

    /* Responsive adjustments for buttons and select elements in main control areas */
    .tab-header .btn, /* Add Vehicle button in Vehicles tab */
    .maintenance-controls .btn { /* Add Record button in Maintenance tab */
        padding: 0.5rem 0.8rem; /* Match header-action-btn's intermediate size */
        font-size: 0.8rem;
    }

    /* Select elements for vehicle selection/filtering */
    .dashboard-header .vehicle-selector select, /* Dashboard select */
    .maintenance-controls select, /* Maintenance filter select */
    .report-controls select, /* Reports filter select */
    .troubleshooting-form select { /* AI Troubleshooting select */
        padding: 0.5rem 0.8rem; /* Match button padding */
        font-size: 0.8rem;
        background-position: right 0.6rem center; /* Adjust arrow position */
        background-size: 0.7rem;
    }

    /* Hide button text on small screens for main content buttons */
    .tab-header .btn .btn-text,
    .maintenance-controls .btn .btn-text {
        display: none;
    }


    /* Reduce typography inside small containers/cards for mobile */
    .dashboard-card, .vehicle-card, .report-card, .maintenance-record, .ai-card {
        font-size: 0.88rem;
    }
    .dashboard-card h3, .card-header h3, .vehicle-title, .maintenance-title, .report-card h3 {
        font-size: 0.98rem;
    }
    .info-item .info-label { font-size: 0.72rem; }
    .info-item .info-value, .maintenance-meta, .maintenance-date, .cost-value {
        font-size: 0.82rem;
    }
    .chat-message { font-size: 0.85rem; max-width: 90%; }
    .receipt-thumbnail { width: 84px; height: 84px; }

    /* Reduce spacing between settings tabs for mobile */
    .settings-tabs {
        gap: 0.2rem; /* Reduced from 0.5rem */
    }
    .settings-tab {
        padding: 0.5rem 0.4rem; /* Reduced horizontal padding */
        font-size: 0.8rem; /* Slightly smaller font */
    }
}
/* ============================================================================== */
@media (max-width: 480px) {
    .nav-tabs {
        gap: 0.14rem; /* Even smaller gap for nav tabs */
    }
    /* Further reduce description size on very small screens */
    .section-slogan {
        font-size: 0.77rem;
    }
    .nav-button {
        padding: 0.25rem 0.12rem 0.25rem 0.25rem;
        font-size: 0.61rem;
        border-radius: 2px;
    }
    .logo h1 {
        font-size: 1.3rem;
        margin: 10px 0px 0px 0px
    }
    .logo img {
    height: 35px;
    margin: 10px 0px 0px 7px;
    }

    .app-container {
        padding: 0.5rem; /* Reduced overall left/right padding for smaller screens */
    }

    .header {
        padding: 0.2rem 0.2rem 0.2rem 0.2rem; /* Reduced internal header padding for smaller screens */
    }

    .header-actions .header-action-btn {
        padding: 0.35rem 0.2rem 0.2rem 0.2rem; /* Even smaller padding for header buttons */
        font-size: 0.7rem; /* Even smaller icons in header buttons */
        margin: 10px 0px 0px 0px;
    }

    /* Further shrink buttons in tab-headers */
    .tab-header .btn,
    .maintenance-controls .btn {
        padding: 0.3rem 0.5rem; /* Match header-action-btn's smallest size */
        font-size: 0.7rem;
    }

    /* Further shrink select elements in control areas */
    .dashboard-header .vehicle-selector select,
    .maintenance-controls select,
    .report-controls select,
    .troubleshooting-form select {
        padding: 0.3rem 0.5rem; /* Match button padding */
        font-size: 0.7rem;
        background-position: right 0.4rem center; /* Adjust arrow position */
        background-size: 0.6rem;
    }

    .header-slogan {
        margin: 0.5rem 0 0 0.5rem; /* Further adjust padding for smallest screens */
        font-size: 0.65em;
    }

    /* Further reduce settings tab spacing for very small screens */
    .settings-tabs {
        gap: 0.1rem; /* Even smaller gap */
    }
    .settings-tab {
        padding: 0.4rem 0.2rem; /* Further reduced padding */
        font-size: 0.7rem; /* Smaller font for very small screens */
    }
}

/* Maintenance-specific control sizing: keep icons on one row and give the two-line button room */
.maintenance-controls .btn,
.tab-header .btn {
    min-width: 84px; /* ensures two-line labels don't collapse to unintended wrapping */
    max-width: 160px;
}

/* Vehicle dropdown in maintenance page: fixed to ~18 characters width and truncate overflow */
.maintenance-controls select,
.maintenance-controls .vehicle-selector select,
#maintenanceVehicle,
#maintenanceVehicleFilter {
    flex: 1;              /* allow the select to grow and fill available space */
    max-width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Ensure select displays ellipsis in most browsers */
.maintenance-controls select option,
#maintenanceVehicle option {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Keep icons row from wrapping: force nowrap in actions area */
.maintenance-actions,
.vehicle-actions {
    display: flex;
    gap: 0.25rem;
    flex-wrap: nowrap;
    align-items: center;
}

/* Make the Add Record button in maintenance header smaller (approx 50% of previous padding/font) and align right */
.tab-header > .btn#addMaintenanceBtn {
    padding: 0.5rem 0.5rem 0.4rem 0.5rem; /* ~50% smaller than default 0.6rem 1.2rem */
    font-size: 0.6rem;     /* reduced font size */
    min-width: 72px;        /* keep usable tap area */
    max-width: 120px;
    align-self: center;
    white-space: normal;    /* allow it to display two-line label if needed */
    text-align: center;
    line-height: 1;
}

/* Make the Vehicles Add Vehicle button 50% smaller and align right in the .tab-header */
.tab-header > .btn#addVehicleBtn2 {
    padding: 0.5rem 0.5rem 0.4rem 0.5rem; /* ~50% smaller than default */
    font-size: 0.6rem;
    min-width: 72px;
    max-width: 120px;
    align-self: center;
    white-space: nowrap;
    text-align: center;
    line-height: 1;
}