/* ============================================
   NIKE WEBSITE - DESIGN SYSTEM
   Tone: Athletic/Industrial with bold typography
   Palette: Monochrome Luxe with electric accents
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Monochrome Luxe */
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #111111;
    --color-text-secondary: #707072;
    --color-border: #E5E5E5;
    --color-accent: #FF4500;
    --color-accent-hover: #E63E00;
    
    /* Typography */
    --font-display: 'Bebas Neue', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.nav-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

.logo svg {
    width: 60px;
    height: 24px;
    fill: var(--color-text);
    transition: var(--transition-fast);
}

.logo:hover svg {
    fill: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    padding: var(--space-xs) 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition-base);
}

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

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

.icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition-fast);
}

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

.icon-btn svg {
    width: 20px;
    height: 20px;
}

.menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-xs);
}

.menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-image-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        rgba(0,0,0,0.7) 0%,
        rgba(0,0,0,0.4) 50%,
        rgba(0,0,0,0.1) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    padding-top: 80px;
    width: 100%;
}

.hero-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.2s;
    opacity: 0;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(4rem, 12vw, 10rem);
    line-height: 0.9;
    letter-spacing: -0.02em;
    color: #fff;
    margin-bottom: var(--space-md);
}

.hero-title .line {
    display: block;
    animation: slideInLeft 1s ease forwards;
    opacity: 0;
}

.hero-title .line:nth-child(1) {
    animation-delay: 0.3s;
}

.hero-title .line:nth-child(2) {
    animation-delay: 0.5s;
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255,255,255,0.8);
    max-width: 480px;
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.7s;
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.9s;
    opacity: 0;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: rgba(255,255,255,0.6);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    animation: fadeIn 1s ease forwards;
    animation-delay: 1.2s;
    opacity: 0;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: rgba(255,255,255,0.3);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    animation: scrollLine 2s ease-in-out infinite;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 30px;
    transition: var(--transition-base);
}

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

.btn-primary:hover {
    background: var(--color-accent);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.5);
}

.btn-secondary:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.1);
}

.btn-small {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.75rem;
    background: #fff;
    color: var(--color-text);
}

.btn-small:hover {
    background: var(--color-accent);
    color: #fff;
}

/* ============================================
   SECTIONS COMMON
   ============================================ */
section {
    padding: var(--space-3xl) var(--space-lg);
}

.section-header {
    max-width: 1440px;
    margin: 0 auto var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
    line-height: 1;
}

.link-arrow {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.link-arrow span {
    transition: var(--transition-fast);
}

.link-arrow:hover span {
    transform: translateX(4px);
}

/* ============================================
   CATEGORIES SECTION
   ============================================ */
.categories {
    background: var(--color-surface);
}

.categories-grid {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 400px);
    gap: var(--space-md);
}

.category-card {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
}

.category-card.large {
    grid-column: span 2;
    grid-row: span 2;
}

.category-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

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

.category-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-lg);
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: #fff;
}

.category-content h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: var(--space-sm);
}

/* ============================================
   TRENDING SECTION
   ============================================ */
.trending {
    background: var(--color-bg);
    overflow: hidden;
}

.trending-nav {
    display: flex;
    gap: var(--space-sm);
}

.nav-arrow {
    width: 48px;
    height: 48px;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.nav-arrow:hover {
    background: var(--color-text);
    color: #fff;
    border-color: var(--color-text);
}

.products-scroll {
    max-width: 1440px;
    margin: 0 auto;
    display: flex;
    gap: var(--space-md);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: var(--space-md);
}

.products-scroll::-webkit-scrollbar {
    display: none;
}

.product-card {
    flex: 0 0 300px;
    scroll-snap-align: start;
    background: var(--color-surface);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition-base);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    background: #f5f5f5;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.wishlist-btn {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 36px;
    height: 36px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--color-text);
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.wishlist-btn:hover {
    background: var(--color-accent);
    color: #fff;
}

.product-info {
    padding: var(--space-md);
}

.product-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.product-category {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.product-price {
    font-size: 1rem;
    font-weight: 600;
}

/* ============================================
   COLLECTION SECTION
   ============================================ */
.collection {
    padding: 0;
    background: var(--color-text);
    color: #fff;
}

.collection-grid {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 80vh;
}

.collection-text {
    padding: var(--space-3xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.collection-tag {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.collection-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    line-height: 0.9;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-lg);
}

.collection-desc {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.7);
    max-width: 400px;
    margin-bottom: var(--space-xl);
    line-height: 1.7;
}

.collection-image {
    position: relative;
    overflow: hidden;
}

.collection-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================
   MEMBERSHIP SECTION
   ============================================ */
.membership {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #fff;
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
}

.membership-content {
    max-width: 600px;
    margin: 0 auto;
}

.membership-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.membership-desc {
    font-size: 1.125rem;
    color: rgba(255,255,255,0.7);
    margin-bottom: var(--space-xl);
}

.membership-cta {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-text);
    color: #fff;
    padding: var(--space-3xl) var(--space-lg) var(--space-lg);
}

.footer-grid {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr) auto;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-md);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-col a {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.6);
    transition: var(--transition-fast);
}

.footer-col a:hover {
    color: #fff;
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    transition: var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-accent);
}

.footer-social svg {
    width: 18px;
    height: 18px;
}

.footer-bottom {
    max-width: 1440px;
    margin: 0 auto;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-location {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.6);
}

.footer-legal {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    font-size: 0.75rem;
    color: rgba(255,255,255,0.6);
}

.footer-legal a:hover {
    color: #fff;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    to { opacity: 1; }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scrollLine {
    0% { transform: translateY(-100%); }
    50% { transform: translateY(0); }
    100% { transform: translateY(100%); }
}

/* Scroll reveal animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .nav-links {
        display: none;
    }
    
    .menu-btn {
        display: flex;
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(3, 300px);
    }
    
    .category-card.large {
        grid-column: span 2;
        grid-row: span 1;
    }
    
    .collection-grid {
        grid-template-columns: 1fr;
    }
    
    .collection-image {
        min-height: 400px;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-content {
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-title {
        text-align: center;
    }
    
    .hero-subtitle {
        text-align: center;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(4, 300px);
    }
    
    .category-card.large {
        grid-column: span 1;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-legal {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

@media (max-width: 480px) {
    :root {
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 3rem;
        --space-3xl: 4rem;
    }
    
    .nav-container {
        padding: 0 var(--space-md);
    }
    
    section {
        padding: var(--space-2xl) var(--space-md);
    }
    
    .collection-text {
        padding: var(--space-xl) var(--space-md);
    }
}