@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&display=swap');

:root {
    /* 🎨 COLOR TOKENS */
    /* Primary/Brand */
    --color-primary-500: #005A9C;
    --color-primary-600: #004a7e;

    /* Accent/Secondary */
    --color-accent-400: #FDB813;
    --color-accent-500: #e4a612;

    /* Neutral/Gray Scale */
    --color-neutral-0: #ffffff;
    --color-neutral-50: #f4f4f4;
    --color-neutral-100: #e9ecef;
    --color-neutral-200: #dee2e6;
    --color-neutral-500: #6c757d;
    --color-neutral-700: #333333;
    --color-neutral-900: #1a1a1a;

    /* System Feedback */
    --color-success-500: #28a745;
    --color-danger-500: #dc3545;

    /* Derived Semantic Colors (Light Theme) */
    --color-background: var(--color-neutral-50);
    --color-surface: var(--color-neutral-0);
    --color-text: var(--color-neutral-700);
    --color-text-heading: var(--color-neutral-900);
    --color-text-muted: var(--color-neutral-500);
    --color-border: var(--color-neutral-200);
    --color-surface-accent: var(--color-neutral-100);

    /*  typography */
    --font-family-base: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-h1: clamp(2.2rem, 5vw, 3rem);
    --font-size-h2: clamp(1.8rem, 4vw, 2.5rem);
    --font-size-h3: clamp(1.5rem, 3.5vw, 1.75rem);
    --font-size-h4: 1.25rem;

    /* spacing */
    --space-1: 0.25rem; /* 4px */
    --space-2: 0.5rem; /* 8px */
    --space-3: 0.75rem; /* 12px */
    --space-4: 1rem; /* 16px */
    --space-5: 1.5rem; /* 24px */
    --space-6: 2rem; /* 32px */
    --space-7: 2.5rem; /* 40px */
    --space-8: 4rem; /* 64px */

    /* UI Properties */
    --radius-md: 8px;
    --radius-full: 9999px;
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.12);

    /* Motion */
    --duration-fast: 0.2s;
    --duration-normal: 0.3s;
    --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* Z-Index Scale */
    --z-index-header: 100;
    --z-index-modal: 1000;
    --z-index-command-palette: 2000;
}

[data-theme="dark"] {
    --color-primary-500: #3b82f6;
    --color-primary-600: #2563eb;
    --color-accent-400: #FDB813;
    --color-accent-500: #e4a612;
    --color-neutral-0: #121212;
    --color-neutral-50: #1e1e1e;
    --color-neutral-100: #2c2c2c;
    --color-neutral-200: #495057;
    --color-neutral-500: #adb5bd;
    --color-neutral-700: #f4f4f4;
    --color-neutral-900: #f4f4f4;
    --color-background: var(--color-neutral-0);
    --color-surface: var(--color-neutral-50);
    --color-text: var(--color-neutral-700);
    --color-text-heading: var(--color-neutral-900);
    --color-text-muted: var(--color-neutral-500);
    --color-border: var(--color-neutral-200);
    --color-surface-accent: var(--color-neutral-100);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: 1.6;
    background-color: var(--color-background);
    color: var(--color-text);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color var(--duration-normal) var(--ease-out), color var(--duration-normal) var(--ease-out);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin-inline: auto;
    padding-inline: var(--space-5);
}

h1, h2, h3, h4 {
    line-height: 1.2;
    margin-block-end: var(--space-4);
    color: var(--color-text-heading);
    font-weight: var(--font-weight-bold);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

h2 {
    text-align: center;
    margin-block-end: var(--space-7);
}

p {
    margin-block-end: var(--space-4);
}

a {
    text-decoration: none;
    color: var(--color-primary-500);
    transition: color var(--duration-fast) var(--ease-out);
}

a:hover {
    text-decoration: underline;
    color: var(--color-accent-400);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* --- Layout & Sections --- */
header {
    background-color: var(--color-surface);
    padding-block: var(--space-4);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: var(--z-index-header);
    border-block-end: 1px solid var(--color-border);
    transition: background-color var(--duration-normal) ease, border-color var(--duration-normal) ease;
}

[data-theme="dark"] header {
    border-block-end-color: rgba(255, 255, 255, 0.1);
}

header .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.logo {
    font-size: 1.8rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary-500);
}
.logo:hover { text-decoration: none; }

[data-theme="dark"] .logo {
    color: var(--color-text-heading);
}

header nav ul {
    list-style: none;
    display: flex;
    gap: var(--space-5);
}

header nav a {
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-base);
    padding-block: var(--space-2);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

main {
    flex: 1 0 auto;
}

section {
    padding-block: var(--space-8);
}

#hero {
    background-color: var(--color-neutral-900);
    background-image: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('https://images.unsplash.com/photo-1517524206127-48bbd363f5d4?auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    color: var(--color-neutral-0);
    text-align: center;
    padding: 6rem var(--space-5);
}

#hero h2 {
    color: var(--color-neutral-0);
    font-size: clamp(2.2rem, 6vw, 2.8rem);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

#hero p {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin-inline: auto;
    margin-block-end: var(--space-6);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

#events,
#vehicles,
#events-page,
#all-vehicles-page,
#vehicles-page {
    background-color: var(--color-background);
    padding-block-end: var(--space-6);
}

#cta-seller {
    background-color: var(--color-neutral-900);
    color: var(--color-neutral-0);
    text-align: center;
    border-radius: var(--radius-md);
    margin-block: var(--space-6);
    margin-inline: auto;
    max-width: 1200px;
}

#cta-seller h2 {
    color: var(--color-neutral-0);
}

.section-actions {
    text-align: center;
    margin-block-start: var(--space-7);
}

footer {
    background-color: var(--color-neutral-900);
    color: var(--color-neutral-50);
    text-align: center;
    padding: var(--space-6) var(--space-5);
    margin-block-start: auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-5);
    margin-block-end: var(--space-4);
    flex-wrap: wrap;
}

.footer-links a { color: var(--color-neutral-200); }
.footer-links a:hover { color: var(--color-accent-400); }

/* --- Grid & Cards --- */
.grid-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}

.grid-container > p {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-6);
    color: var(--color-text-muted);
}

.card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}

.card:hover, .card:focus-within {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.event-card .event-details {
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.event-card h3 {
    color: var(--color-primary-500);
    margin-block-end: var(--space-3);
    font-size: var(--font-size-lg);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.4em; /* for 2 lines */
}

.event-card p {
    margin-block-end: var(--space-2);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.event-card .btn {
    margin-block-start: auto;
}

.vehicle-card {
    cursor: pointer;
}

.vehicle-card h4 {
    padding: var(--space-4) var(--space-5) 0;
    font-size: var(--font-size-lg);
    margin-block-end: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.vehicle-card p {
    padding: 0 var(--space-5) var(--space-5);
    margin: 0;
    color: var(--color-accent-400);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-lg);
}

/* --- UI Components --- */
.event-filter,
.filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: center;
    align-items: center;
    padding: var(--space-5);
    border-radius: var(--radius-md);
    max-width: 800px;
    margin-inline: auto;
    margin-block-end: var(--space-7);
}

.event-filter {
    background: rgba(255, 255, 255, 0.1);
}

.filters {
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
}

.event-filter input,
.filters input {
    padding: 12px;
    font-size: var(--font-size-base);
    border: 1px solid var(--color-border);
    background-color: var(--color-surface);
    color: var(--color-text);
    border-radius: var(--radius-md);
    flex: 1;
    min-width: 180px;
}
.filters input:only-child {
    flex-basis: 100%;
}

[data-theme="dark"] .event-filter input, [data-theme="dark"] .filters input {
    background-color: var(--color-surface-accent);
    border-color: var(--color-border);
}

.btn,
.event-filter button,
#back-to-events {
    background: var(--color-primary-500);
    color: var(--color-neutral-0);
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    text-align: center;
    transition: background-color var(--duration-fast) ease, color var(--duration-fast) ease, transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
    display: inline-block;
}

.btn:hover,
.event-filter button:hover,
#back-to-events:hover {
    background: var(--color-accent-400);
    color: var(--color-neutral-900);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary:hover {
    background-color: var(--color-neutral-200);
    color: var(--color-text-heading);
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--color-text);
    transition: color var(--duration-fast) ease, transform var(--duration-fast) ease, background-color var(--duration-fast) ease;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--color-primary-500);
    background-color: var(--color-surface-accent);
}

#theme-toggle .moon-icon { display: none; }
[data-theme="dark"] #theme-toggle .sun-icon { display: none; }
[data-theme="dark"] #theme-toggle .moon-icon { display: inline; }

#back-to-events {
    margin-block-end: var(--space-6);
}

/* Badges */
.verified, .unverified {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    vertical-align: middle;
}

.verified {
    color: var(--color-success-500);
    background-color: hsla(145, 63%, 49%, 0.1);
}

.unverified {
    color: var(--color-text-muted);
    background-color: var(--color-surface-accent);
}

/* --- Seller Profile Page --- */
#seller-profile-page .seller-profile-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    align-items: center;
    margin-block-end: var(--space-7);
    text-align: center;
}

.seller-avatar {
    width: 150px;
    height: 150px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 4px solid var(--color-surface);
    box-shadow: var(--shadow-lg);
}

.seller-info h1 {
    text-align: center;
    margin-block-end: var(--space-2);
}

.seller-info p {
    max-width: 60ch;
    margin-inline: auto;
    color: var(--color-text-muted);
}

#seller-profile-page h2 {
    text-align: left;
    padding-inline-start: var(--space-4);
    border-inline-start: 4px solid var(--color-primary-500);
    margin-block-end: var(--space-6);
}

/* --- Modal --- */
.modal-backdrop {
    position: fixed; inset: 0;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: var(--z-index-modal);
    display: flex; justify-content: center; align-items: center;
    padding: var(--space-5);
    opacity: 0;
    animation: fadeIn var(--duration-normal) var(--ease-out) forwards;
}
@keyframes fadeIn { to { opacity: 1; } }

.modal-content {
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    max-width: 800px; width: 100%; max-height: 90vh;
    overflow-y: auto; position: relative;
    padding: var(--space-7);
    transform: scale(0.95) translateY(10px);
    opacity: 0;
    animation: scaleIn var(--duration-normal) var(--ease-out) forwards;
}
@keyframes scaleIn { to { transform: scale(1) translateY(0); opacity: 1; } }

.modal-content h2 { margin-block-start: 0; text-align: start; }

.modal-close-btn {
    position: absolute; top: 10px; inset-inline-end: 15px;
    background: none; border: none;
    font-size: 2.5rem; color: var(--color-text-muted);
    cursor: pointer; line-height: 1;
    transition: color var(--duration-fast);
}
.modal-close-btn:hover { color: var(--color-danger-500); }

.modal-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-4);
    margin-block-end: var(--space-6);
}
.modal-gallery img {
    border-radius: var(--radius-md);
    width: 100%; height: 120px; object-fit: cover; aspect-ratio: 4/3;
}

.modal-details p {
    margin-block-end: var(--space-4);
    font-size: var(--font-size-lg);
    line-height: 1.7;
}
.modal-details p strong {
    color: var(--color-primary-500);
    margin-inline-end: var(--space-2);
}
[data-theme="dark"] .modal-details p strong { color: var(--color-accent-400); }

.modal-details .btn {
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-sm);
    vertical-align: baseline;
    background-color: transparent;
    color: var(--color-primary-500);
    font-weight: var(--font-weight-medium);
    box-shadow: none;
}
.modal-details .btn:hover {
    background-color: transparent;
    color: var(--color-accent-400);
    text-decoration: underline;
    transform: none;
    box-shadow: none;
}


/* --- Skeleton Loaders --- */
.skeleton { opacity: .7; animation: skeleton-loading 1s linear infinite alternate; }
@keyframes skeleton-loading { 0% { background-color: hsl(200, 20%, 80%); } 100% { background-color: hsl(200, 20%, 95%); } }
[data-theme="dark"] .skeleton { animation: skeleton-loading-dark 1s linear infinite alternate; }
@keyframes skeleton-loading-dark { 0% { background-color: #2a2a2a; } 100% { background-color: #3a3a3a; } }
.skeleton-card { cursor: default; pointer-events: none; }
.skeleton-card:hover { transform: none; box-shadow: var(--shadow-md); }
.skeleton-image { height: 0; padding-block-end: 62.5%; /* 16:10 aspect ratio */ }
.skeleton-content { padding: var(--space-5); }
.skeleton-line-md { height: 24px; width: 70%; margin-block-end: var(--space-3); border-radius: 4px; }
.skeleton-line-sm { height: 16px; width: 90%; margin-block-end: var(--space-2); border-radius: 4px; }
.skeleton-line-sm:last-of-type { width: 80%; }
.skeleton-button { height: 45px; width: 120px; margin-block-start: var(--space-5); border-radius: var(--radius-md); }

/* --- Command Palette --- */
.command-palette {
    position: fixed; inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: var(--z-index-command-palette);
    display: flex; justify-content: center; align-items: flex-start;
    padding-block-start: 15vh;
}
.command-palette-content {
    background-color: var(--color-surface);
    width: 100%; max-width: 600px;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}
.command-palette-content input {
    width: 100%; padding: var(--space-4);
    font-size: 1.2rem; border: none;
    border-block-end: 1px solid var(--color-border);
    outline: none; background-color: transparent; color: var(--color-text);
}
.command-palette-results {
    list-style: none; margin: 0; padding: var(--space-2);
    max-height: 40vh; overflow-y: auto;
}
.command-item, .command-item-none { padding: var(--space-3) var(--space-4); border-radius: 6px; }
.command-item {
    display: flex; justify-content: space-between; align-items: center;
    cursor: pointer; transition: background-color var(--duration-fast);
}
.command-item:hover, .command-item.selected { background-color: var(--color-background); outline: none; }
[data-theme="dark"] .command-item:hover, [data-theme="dark"] .command-item.selected { background-color: var(--color-neutral-100); }
.command-category {
    font-size: 0.8rem; color: var(--color-text-muted);
    background-color: var(--color-surface-accent);
    padding: var(--space-1) var(--space-2); border-radius: 4px;
}
[data-theme="dark"] .command-category { background-color: var(--color-surface-accent); color: var(--color-text); }
.command-item-none { text-align: center; color: var(--color-text-muted); }

/* --- Accessibility --- */
.visually-hidden {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
:focus-visible { outline: 3px solid var(--color-accent-400); outline-offset: 2px; border-radius: 4px; }
.card:focus-visible { box-shadow: 0 0 0 3px var(--color-accent-400); transform: translateY(-5px); }
.btn:focus-visible, .icon-btn:focus-visible, .modal-close-btn:focus-visible, .command-palette-content input:focus-visible { outline-offset: 4px; }
.command-palette-content input:focus-visible { outline-offset: 0; outline: 3px solid var(--color-accent-400); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Responsive Design --- */
@media (min-width: 768px) {
    .grid-container { grid-template-columns: repeat(2, 1fr); }
    #seller-profile-page .seller-profile-header {
        flex-direction: row;
        text-align: left;
        gap: var(--space-6);
    }
    .seller-info h1 { text-align: left; }
    .seller-info p { margin-inline: 0; }
}

@media (min-width: 1024px) {
    .grid-container { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    header nav {
        order: 3;
        width: 100%;
        overflow-x: auto;
        padding-block-start: var(--space-2);
    }
    header nav ul { justify-content: flex-start; }
}

@media (max-width: 600px) {
    .event-filter, .filters { flex-direction: column; }
    .event-filter input, .filters input, .event-filter button { width: 100%; }
    .modal-content { padding: var(--space-5); }
    .modal-content h2 { font-size: 1.5rem; }
    .header-actions {
        flex-grow: 1;
        justify-content: flex-end;
    }
    .header-actions .btn { display: none; } /* Hide Sign up / Log in on small screens */
    .header-actions .btn-secondary { display: none; }
}