/* ============================================
   KICKS - Premium Sneakers Brand
   Design System: Acid Neon + Brutalist Edge
   ============================================ */

/* CSS Variables - Acid Neon Palette */
:root {
    --neon-lime: #CCFF00;
    --neon-pink: #FF3CAC;
    --dark-bg: #0D0D0D;
    --darker-bg: #080808;
    --card-bg: #1A1A1A;
    --text-primary: #FFFFFF;
    --text-secondary: #888888;
    --text-muted: #555555;
    --border-subtle: #2A2A2A;
    
    --font-display: 'Clash Display', sans-serif;
    --font-body: 'Chillax', sans-serif;
    
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

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

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 2rem;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--neon-lime);
    transition: width var(--transition-medium);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.cart-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.cart-btn:hover {
    border-color: var(--neon-lime);
    color: var(--neon-lime);
}

.cart-count {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: var(--neon-lime);
    color: var(--dark-bg);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 50%;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(204, 255, 0, 0.08) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.hero-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    width: 100%;
}

.hero-text {
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(204, 255, 0, 0.1);
    border: 1px solid var(--neon-lime);
    color: var(--neon-lime);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 600;
    line-height: 0.95;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.hero-title .line {
    display: block;
}

.hero-title .accent {
    color: var(--neon-lime);
    position: relative;
}

.hero-title .accent::after {
    content: '';
    position: absolute;
    bottom: 0.1em;
    left: 0;
    width: 100%;
    height: 0.15em;
    background: var(--neon-pink);
    z-index: -1;
    transform: skewX(-10deg);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--neon-lime);
    color: var(--dark-bg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(204, 255, 0, 0.3);
}

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

.btn-secondary:hover {
    border-color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 500px;
}

.hero-shoe {
    width: 400px;
    height: 250px;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border-radius: 20px;
    position: relative;
    transform: rotate(-15deg) skewX(-5deg);
    box-shadow: 
        0 50px 100px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.hero-shoe::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 60%;
    background: linear-gradient(180deg, rgba(204, 255, 0, 0.1) 0%, transparent 100%);
}

.shoe-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(204, 255, 0, 0.15) 0%, transparent 50%);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.shoe-accent {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    height: 8px;
    background: var(--neon-lime);
    border-radius: 4px;
    box-shadow: 0 0 20px rgba(204, 255, 0, 0.5);
}

.floating-tag {
    position: absolute;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-subtle);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    white-space: nowrap;
}

.tag-1 {
    top: 20%;
    right: 10%;
    animation: float 6s ease-in-out infinite;
}

.tag-2 {
    bottom: 20%;
    left: 5%;
    animation: float 6s ease-in-out infinite 1s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Hero Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--neon-lime), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.2); }
}

/* ============================================
   COLLECTION SECTION
   ============================================ */
.collection {
    padding: 8rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.collection-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.product-card {
    background: var(--card-bg);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    transition: all var(--transition-medium);
    position: relative;
}

.product-card:hover {
    transform: translateY(-8px);
    border-color: var(--neon-lime);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.product-card.featured {
    grid-column: span 2;
    grid-row: span 2;
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    background: linear-gradient(135deg, #1a1a1a 0%, #0d0d0d 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-card.featured .product-image {
    aspect-ratio: 1;
}

.shoe-placeholder {
    width: 80%;
    height: 60%;
    border-radius: 12px;
    position: relative;
}

.shoe-1 {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.shoe-1::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 10%;
    right: 10%;
    height: 6px;
    background: var(--neon-lime);
    border-radius: 3px;
    box-shadow: 0 0 15px rgba(204, 255, 0, 0.4);
}

.shoe-2 {
    background: linear-gradient(135deg, #2d1b2e 0%, #1a0f1a 100%);
}

.shoe-2::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 10%;
    right: 10%;
    height: 6px;
    background: var(--neon-pink);
    border-radius: 3px;
    box-shadow: 0 0 15px rgba(255, 60, 172, 0.4);
}

.shoe-3 {
    background: linear-gradient(135deg, #2e1a0f 0%, #1a0f08 100%);
}

.shoe-3::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 10%;
    right: 10%;
    height: 6px;
    background: #ff6b35;
    border-radius: 3px;
    box-shadow: 0 0 15px rgba(255, 107, 53, 0.4);
}

.shoe-4 {
    background: linear-gradient(135deg, #1a1a1a 0%, #0a0a0a 100%);
    border: 1px solid #333;
}

.shoe-4::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 10%;
    right: 10%;
    height: 6px;
    background: #888;
    border-radius: 3px;
}

.product-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.4rem 0.8rem;
    background: var(--neon-lime);
    color: var(--dark-bg);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.product-badge.new {
    background: var(--neon-pink);
    color: var(--text-primary);
}

.product-badge.limited {
    background: transparent;
    border: 1px solid var(--neon-lime);
    color: var(--neon-lime);
}

.product-info {
    padding: 1.5rem;
}

.product-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.product-price {
    font-size: 1rem;
    color: var(--neon-lime);
    font-weight: 600;
    margin-bottom: 1rem;
}

.btn-add {
    width: 100%;
    padding: 0.875rem;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-add:hover {
    background: var(--neon-lime);
    border-color: var(--neon-lime);
    color: var(--dark-bg);
}

/* ============================================
   DROPS BANNER
   ============================================ */
.drops-banner {
    margin: 4rem 2rem;
    padding: 6rem;
    background: linear-gradient(135deg, #1a1a2e 0%, #0d0d0d 100%);
    border: 1px solid var(--border-subtle);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.drops-banner::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at 80% 50%, rgba(204, 255, 0, 0.08) 0%, transparent 60%);
}

.drops-content {
    position: relative;
    z-index: 2;
}

.drops-label {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 60, 172, 0.1);
    border: 1px solid var(--neon-pink);
    color: var(--neon-pink);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 1.5rem;
}

.drops-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.drops-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 400px;
}

.drops-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.drops-shoe {
    width: 300px;
    height: 180px;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a3e 50%, #0d0d1a 100%);
    border-radius: 16px;
    transform: rotate(-10deg);
    box-shadow: 
        0 40px 80px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    position: relative;
}

.drops-shoe::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(180deg, rgba(255, 60, 172, 0.15) 0%, transparent 100%);
}

.drops-shoe::after {
    content: '';
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    height: 8px;
    background: linear-gradient(90deg, var(--neon-pink), var(--neon-lime));
    border-radius: 4px;
    box-shadow: 0 0 30px rgba(255, 60, 172, 0.5);
}

/* ============================================
   FEATURES SECTION
   ============================================ */
.features {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.feature-item {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    color: var(--neon-lime);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-item h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ============================================
   NEWSLETTER
   ============================================ */
.newsletter {
    padding: 6rem 2rem;
    background: var(--darker-bg);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.newsletter-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.newsletter h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    margin-bottom: 1rem;
}

.newsletter p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.newsletter-form {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.newsletter-form input:focus {
    border-color: var(--neon-lime);
}

.newsletter-form input::placeholder {
    color: var(--text-muted);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: 4rem 2rem 2rem;
    background: var(--darker-bg);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 4rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--border-subtle);
}

.footer-brand .logo {
    display: block;
    margin-bottom: 1rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-col h4 {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--neon-lime);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 1024px) {
    .collection-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-card.featured {
        grid-column: span 2;
        grid-row: span 1;
    }
    
    .drops-banner {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 4rem 2rem;
    }
    
    .drops-visual {
        order: -1;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
        height: 300px;
    }
    
    .hero-shoe {
        width: 280px;
        height: 170px;
    }
    
    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .collection-grid {
        grid-template-columns: 1fr;
    }
    
    .product-card.featured {
        grid-column: span 1;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 7rem 1.5rem 3rem;
    }
    
    .collection {
        padding: 4rem 1.5rem;
    }
    
    .drops-banner {
        margin: 2rem 1rem;
        padding: 3rem 1.5rem;
    }
    
    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.8rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}