/* ==========================================================================
   AUCTION - Luxury Art Auction House Template
   A premium template with sophisticated elegance
   ========================================================================== */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================================================== */

:root {
    /* Colors - Luxurious Palette */
    --color-ivory: #fdfbf7;
    --color-cream: #f5f1e8;
    --color-sand: #e8e3d6;

    --color-black: #0a0a0a;
    --color-charcoal: #1a1a1a;
    --color-graphite: #2a2a2a;

    --color-gold: #d4af37;
    --color-gold-light: #e6c860;
    --color-gold-dark: #b8941f;

    --color-burgundy: #6b1b2f;
    --color-burgundy-light: #8b2544;
    --color-burgundy-dark: #4d1421;

    --color-neutral-50: #fafaf9;
    --color-neutral-100: #f5f5f4;
    --color-neutral-200: #e7e5e4;
    --color-neutral-300: #d6d3d1;
    --color-neutral-400: #a8a29e;
    --color-neutral-500: #78716c;
    --color-neutral-600: #57534e;
    --color-neutral-700: #44403c;
    --color-neutral-800: #292524;
    --color-neutral-900: #1c1917;

    /* Typography Scale */
    --font-serif: 'Playfair Display', 'Georgia', serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --text-hero: clamp(3rem, 8vw, 6rem);
    --text-display: clamp(2.5rem, 5vw, 4rem);
    --text-h1: clamp(2rem, 4vw, 3rem);
    --text-h2: clamp(1.5rem, 3vw, 2.25rem);
    --text-h3: clamp(1.25rem, 2vw, 1.5rem);
    --text-body: 1rem;
    --text-small: 0.875rem;
    --text-xs: 0.75rem;

    /* Spacing Scale (8px base) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius-md: 0.25rem;
    --radius-lg: 0.5rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);

    /* Gold Glow Effects */
    --glow-gold: 0 0 30px rgba(212, 175, 55, 0.3);
    --glow-gold-lg: 0 0 60px rgba(212, 175, 55, 0.4);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-elegant: 800ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark mode colors */
[data-theme="dark"] {
    --color-ivory: #0a0a0a;
    --color-cream: #1a1a1a;
    --color-sand: #2a2a2a;

    --color-black: #fdfbf7;
    --color-charcoal: #f5f1e8;
    --color-graphite: #e8e3d6;
}

/* ==========================================================================
   BASE STYLES
   ========================================================================== */

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-body);
    line-height: 1.6;
    color: var(--color-neutral-800);
    background-color: var(--color-ivory);
    transition: background-color var(--transition-base), color var(--transition-base);
}

.dark body {
    color: var(--color-neutral-200);
    background-color: var(--color-black);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-black);
    margin-bottom: var(--space-4);
}

.dark h1, .dark h2, .dark h3, .dark h4, .dark h5, .dark h6 {
    color: var(--color-ivory);
}

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

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

a {
    color: var(--color-gold);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-gold-light);
}

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

/* Selection */
::selection {
    background-color: var(--color-gold);
    color: white;
}

::-moz-selection {
    background-color: var(--color-gold);
    color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-cream);
}

.dark ::-webkit-scrollbar-track {
    background: var(--color-charcoal);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gold);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gold-dark);
}

/* ==========================================================================
   UTILITY CLASSES
   ========================================================================== */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding: var(--space-20) 0;
}

.section-lg {
    padding: var(--space-32) 0;
}

.text-center {
    text-align: center;
}

.text-gold {
    color: var(--color-gold);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.sr-only:focus {
    position: static;
    width: auto;
    height: auto;
    padding: var(--space-2) var(--space-4);
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(253, 251, 247, 0.95);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-sand);
    transition: all var(--transition-base);
}

.dark .navbar {
    background-color: rgba(10, 10, 10, 0.95);
    border-bottom-color: var(--color-graphite);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.navbar-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-black);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.dark .navbar-logo {
    color: var(--color-ivory);
}

.navbar-logo:hover {
    color: var(--color-gold);
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
}

.navbar-link {
    color: var(--color-neutral-700);
    font-size: var(--text-small);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: color var(--transition-base);
}

.dark .navbar-link {
    color: var(--color-neutral-300);
}

.navbar-link:hover {
    color: var(--color-gold);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--color-neutral-700);
    cursor: pointer;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.dark .theme-toggle {
    color: var(--color-neutral-300);
}

.theme-toggle:hover {
    background-color: var(--color-cream);
    color: var(--color-gold);
}

.dark .theme-toggle:hover {
    background-color: var(--color-charcoal);
}

.mobile-toggle {
    display: none;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-neutral-700);
    transition: all var(--transition-base);
}

.dark .mobile-toggle span {
    background-color: var(--color-neutral-300);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-gold);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--color-gold-dark);
    box-shadow: var(--glow-gold);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-gold);
    border: 1px solid var(--color-gold);
}

.btn-outline:hover {
    background-color: var(--color-gold);
    color: white;
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-neutral-700);
}

.dark .btn-ghost {
    color: var(--color-neutral-300);
}

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

.dark .btn-ghost:hover {
    background-color: var(--color-charcoal);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-body);
}

/* ==========================================================================
   HERO SECTIONS
   ========================================================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: var(--text-hero);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: var(--text-h3);
    color: var(--color-neutral-600);
    margin-bottom: var(--space-8);
    font-weight: 300;
}

.dark .hero-subtitle {
    color: var(--color-neutral-400);
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* Decorative Elements */
.hero-decoration {
    position: absolute;
    pointer-events: none;
}

.gold-circle {
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
    filter: blur(60px);
}

/* ==========================================================================
   LOT CARDS (Signature Component)
   ========================================================================== */

.lot-card {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-elegant);
    border: 1px solid var(--color-neutral-200);
}

.dark .lot-card {
    background-color: var(--color-charcoal);
    border-color: var(--color-graphite);
}

.lot-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
}

.lot-image {
    aspect-ratio: 4/5;
    overflow: hidden;
    background-color: var(--color-cream);
    position: relative;
}

.dark .lot-image {
    background-color: var(--color-graphite);
}

.lot-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-elegant);
}

.lot-card:hover .lot-image img {
    transform: scale(1.05);
}

.lot-number {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    background-color: rgba(10, 10, 10, 0.8);
    color: var(--color-gold);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.lot-body {
    padding: var(--space-6);
}

.lot-artist {
    font-family: var(--font-serif);
    font-size: var(--text-small);
    color: var(--color-neutral-600);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.dark .lot-artist {
    color: var(--color-neutral-400);
}

.lot-title {
    font-family: var(--font-serif);
    font-size: var(--text-h3);
    font-weight: 400;
    margin-bottom: var(--space-3);
    color: var(--color-black);
}

.dark .lot-title {
    color: var(--color-ivory);
}

.lot-details {
    font-size: var(--text-small);
    color: var(--color-neutral-600);
    margin-bottom: var(--space-4);
}

.dark .lot-details {
    color: var(--color-neutral-400);
}

.lot-estimate {
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-neutral-200);
}

.dark .lot-estimate {
    border-top-color: var(--color-graphite);
}

.lot-estimate-label {
    font-size: var(--text-xs);
    color: var(--color-neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-1);
}

.lot-estimate-value {
    font-family: var(--font-serif);
    font-size: var(--text-h3);
    color: var(--color-gold);
    font-weight: 400;
}

/* ==========================================================================
   AUCTION COUNTDOWN (Signature Component)
   ========================================================================== */

.countdown {
    display: flex;
    gap: var(--space-6);
    justify-content: center;
    margin: var(--space-8) 0;
}

.countdown-item {
    text-align: center;
}

.countdown-value {
    font-family: var(--font-serif);
    font-size: var(--text-display);
    color: var(--color-gold);
    font-weight: 400;
    line-height: 1;
    margin-bottom: var(--space-2);
}

.countdown-label {
    font-size: var(--text-xs);
    color: var(--color-neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* ==========================================================================
   DEPARTMENT CARDS (Signature Component)
   ========================================================================== */

.department-card {
    position: relative;
    aspect-ratio: 3/4;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-elegant);
}

.department-card:hover {
    transform: scale(1.02);
}

.department-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-elegant);
}

.department-card:hover .department-image {
    transform: scale(1.1);
}

.department-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(10, 10, 10, 0.9) 0%, transparent 60%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--space-8);
    transition: background var(--transition-base);
}

.department-card:hover .department-overlay {
    background: linear-gradient(to top, rgba(10, 10, 10, 0.95) 0%, rgba(10, 10, 10, 0.3) 100%);
}

.department-title {
    font-family: var(--font-serif);
    font-size: var(--text-h2);
    color: white;
    margin-bottom: var(--space-2);
    font-weight: 400;
}

.department-count {
    color: var(--color-gold);
    font-size: var(--text-small);
    letter-spacing: 0.05em;
}

/* ==========================================================================
   GRIDS
   ========================================================================== */

.grid {
    display: grid;
    gap: var(--space-8);
}

.grid-2 {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

/* ==========================================================================
   FORMS
   ========================================================================== */

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-size: var(--text-small);
    font-weight: 500;
    color: var(--color-neutral-700);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.dark .form-label {
    color: var(--color-neutral-300);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-family: var(--font-sans);
    font-size: var(--text-body);
    color: var(--color-neutral-800);
    background-color: white;
    border: 1px solid var(--color-neutral-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.dark .form-input,
.dark .form-textarea,
.dark .form-select {
    color: var(--color-neutral-200);
    background-color: var(--color-charcoal);
    border-color: var(--color-graphite);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-gold);
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
    background-color: var(--color-charcoal);
    color: var(--color-neutral-300);
    padding: var(--space-20) 0 var(--space-8);
    border-top: 1px solid var(--color-gold);
}

.dark .footer {
    background-color: var(--color-black);
    border-top-color: var(--color-gold-dark);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-gold);
    margin-bottom: var(--space-4);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.footer-description {
    color: var(--color-neutral-400);
    margin-bottom: var(--space-6);
}

.footer-title {
    font-family: var(--font-serif);
    font-size: var(--text-h3);
    color: var(--color-ivory);
    margin-bottom: var(--space-4);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-3);
}

.footer-links a {
    color: var(--color-neutral-400);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-gold);
}

.footer-bottom {
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-graphite);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-copyright {
    color: var(--color-neutral-500);
    font-size: var(--text-small);
}

.footer-legal {
    display: flex;
    gap: var(--space-6);
    list-style: none;
}

.footer-legal a {
    color: var(--color-neutral-500);
    font-size: var(--text-small);
}

.footer-legal a:hover {
    color: var(--color-gold);
}

/* ==========================================================================
   SCROLL REVEAL ANIMATIONS
   ========================================================================== */

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-elegant),
                transform var(--transition-elegant);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: all var(--transition-elegant);
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(40px);
    transition: all var(--transition-elegant);
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-scale {
    opacity: 0;
    transform: scale(0.95);
    transition: all var(--transition-elegant);
}

.reveal-scale.active {
    opacity: 1;
    transform: scale(1);
}

/* Stagger delays */
.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }
.stagger-5 { transition-delay: 0.5s; }
.stagger-6 { transition-delay: 0.6s; }

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-title {
        font-size: clamp(2rem, 10vw, 3rem);
    }

    .countdown {
        gap: var(--space-4);
    }

    .countdown-value {
        font-size: var(--text-h1);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

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

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */

@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;
    }

    .reveal, .reveal-left, .reveal-right, .reveal-scale {
        opacity: 1;
        transform: none;
    }
}

/* ==========================================================================
   PRINT STYLES
   ========================================================================== */

@media print {
    .navbar,
    .footer,
    .theme-toggle,
    .btn {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}

/* ==========================================================================
   PERFORMANCE OPTIMIZATIONS
   ========================================================================== */

section {
    content-visibility: auto;
    contain-intrinsic-size: 0 500px;
}