:root {
    --bg-primary: #0a0a0a;
    --bg-card: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #999;
    --accent: #ff3e00;
    --accent-glow: rgba(255, 62, 0, 0.3);
    --border: #2a2a2a;
    --font-display: 'Unbounded', sans-serif;
    --font-mono: 'Space Mono', monospace;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Animated Background */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 62, 0, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 62, 0, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s var(--transition-smooth);
}

.header.scrolled {
    background: rgba(10, 10, 10, 0.95);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.header-content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.logo h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 900;
    font-style: italic;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-subtitle {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
}

.header-price {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent);
}

/* Main Container */
.container {
    position: relative;
    max-width: 1800px;
    margin: 0 auto;
    padding: 3rem 2rem 10rem 2rem;
}

/* Gallery Grid */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    animation: fadeIn 0.6s var(--transition-smooth);
}

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

/* Image Card */
.image-card {
    position: relative;
    aspect-ratio: 16/10;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-card);
    border: 2px solid transparent;
    transition: all 0.4s var(--transition-smooth);
    will-change: transform;
}

.image-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 62, 0, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.4s var(--transition-smooth);
    z-index: 2;
}

.image-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--accent);
    box-shadow: 0 20px 60px rgba(255, 62, 0, 0.2);
}

.image-card:hover::before {
    opacity: 1;
}

.image-card.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-glow), 0 20px 60px rgba(255, 62, 0, 0.3);
    transform: scale(1.03);
}

.image-card.selected::after {
    content: "✓";
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 900;
    z-index: 10;
    animation: checkmark 0.3s var(--transition-bounce);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

@keyframes checkmark {
    0% { transform: scale(0) rotate(-180deg); }
    100% { transform: scale(1) rotate(0deg); }
}

.image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--transition-smooth);
    user-select: none;
    -webkit-user-drag: none;
}

.image-card:hover img {
    transform: scale(1.08);
}

.image-card.selected img {
    filter: brightness(1.1) saturate(1.2);
}

/* Loading State */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    gap: 1rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Cart Bar */
.cart-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    border-top: 2px solid var(--accent);
    padding: 1.5rem 2rem;
    transform: translateY(100%);
    transition: transform 0.5s var(--transition-smooth);
    z-index: 2000;
    box-shadow: 0 -20px 60px rgba(0, 0, 0, 0.8);
}

.cart-bar.visible {
    transform: translateY(0);
}

.cart-content {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cart-info {
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
}

.cart-count {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
}

.cart-total {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 900;
    font-style: italic;
    color: var(--accent);
    line-height: 1;
}

.checkout-btn {
    position: relative;
    padding: 1.2rem 3rem;
    background: var(--accent);
    color: #fff;
    border: none;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s var(--transition-smooth);
}

.checkout-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 100%);
    opacity: 0;
    transition: opacity 0.3s var(--transition-smooth);
}

.checkout-btn:hover {
    background: #fff;
    color: var(--accent);
    transform: translateX(-4px);
    box-shadow: 4px 0 0 0 var(--accent);
}

.checkout-btn:hover::before {
    opacity: 1;
}

.checkout-btn:disabled {
    background: var(--border);
    color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        padding: 1rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .container {
        padding: 2rem 1rem 8rem 1rem;
    }
    
    .gallery {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .cart-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .cart-bar {
        padding: 1rem;
    }
    
    .checkout-btn {
        width: 100%;
        padding: 1rem;
    }
}

/* Smooth Page Transitions */
.page-transition {
    animation: pageEnter 0.4s var(--transition-smooth);
}

@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}