/* ============================================
   CHRONOS - Premium Smartwatch Brand
   Design System: Copper & Slate
   ============================================ */

:root {
    /* Copper & Slate Palette */
    --color-copper: #B87333;
    --color-copper-light: #D4A574;
    --color-copper-dark: #8B5A2B;
    --color-slate: #2F3640;
    --color-slate-light: #4A5568;
    --color-slate-dark: #1A1D23;
    --color-cream: #F5F0EB;
    --color-cream-dark: #E8E0D5;
    --color-white: #FAFAFA;
    
    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, sans-serif;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    --space-3xl: 8rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-slower: 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;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-cream);
    color: var(--color-slate);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

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

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) var(--space-xl);
    transition: var(--transition-base);
}

.nav.scrolled {
    background: rgba(245, 240, 235, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(47, 54, 64, 0.1);
}

.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: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-slate);
}

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

.nav-links a {
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-slate-light);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-copper);
    transition: var(--transition-base);
}

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

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

.nav-cta {
    padding: var(--space-xs) var(--space-md);
    background: var(--color-slate);
    color: var(--color-cream);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: var(--transition-base);
}

.nav-cta:hover {
    background: var(--color-copper);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-xs);
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: calc(var(--space-3xl) + 80px) var(--space-xl) var(--space-3xl);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 600px;
    z-index: 2;
}

.hero-eyebrow {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-copper);
    margin-bottom: var(--space-md);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    line-height: 1;
    color: var(--color-slate);
    margin-bottom: var(--space-md);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-slate-light);
    max-width: 400px;
    margin-bottom: var(--space-lg);
}

.hero-cta-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: var(--transition-base);
}

.btn-primary {
    background: var(--color-slate);
    color: var(--color-cream);
}

.btn-primary:hover {
    background: var(--color-copper);
    transform: translateY(-2px);
}

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

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

.btn-full {
    width: 100%;
}

.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image-container {
    position: relative;
    width: 100%;
    max-width: 600px;
}

.hero-image {
    width: 100%;
    height: auto;
    position: relative;
    z-index: 2;
    filter: drop-shadow(0 40px 80px rgba(47, 54, 64, 0.3));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(184, 115, 51, 0.3) 0%, transparent 70%);
    filter: blur(60px);
    z-index: 1;
}

.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);
}

.hero-scroll span {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-slate-light);
}

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

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.8); }
}

/* ============================================
   Section Styles
   ============================================ */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
}

.section-eyebrow {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-copper);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 400;
    line-height: 1.2;
    color: var(--color-slate);
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-slate-light);
}

/* ============================================
   Collection Section
   ============================================ */
.collection {
    padding: var(--space-3xl) var(--space-xl);
    background: var(--color-white);
}

.collection-tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-slate-light);
    background: transparent;
    border: 1px solid transparent;
    transition: var(--transition-base);
}

.tab-btn:hover {
    color: var(--color-slate);
}

.tab-btn.active {
    color: var(--color-slate);
    border-color: var(--color-slate);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.product-card {
    background: var(--color-cream);
    border: 1px solid var(--color-cream-dark);
    transition: var(--transition-base);
    cursor: pointer;
    overflow: hidden;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(47, 54, 64, 0.1);
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-cream-dark) 100%);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

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

.product-badge {
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    padding: 4px 12px;
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: var(--color-slate);
    color: var(--color-cream);
}

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

.product-category {
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-copper);
    margin-bottom: var(--space-xs);
}

.product-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-slate);
    margin-bottom: var(--space-xs);
}

.product-price {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-slate);
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--space-3xl) var(--space-xl);
    background: var(--color-slate);
    color: var(--color-cream);
}

.features .section-eyebrow {
    color: var(--color-copper-light);
}

.features .section-title {
    color: var(--color-cream);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    padding: var(--space-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition-base);
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-copper);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-md);
    color: var(--color-copper);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--color-cream);
}

.feature-card p {
    font-size: 0.9375rem;
    color: rgba(245, 240, 235, 0.7);
}

/* ============================================
   About Section
   ============================================ */
.about {
    padding: var(--space-3xl) var(--space-xl);
    background: var(--color-cream);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    max-width: 1200px;
    margin: 0 auto;
    align-items: center;
}

.about-text {
    max-width: 500px;
}

.about-text .section-title {
    text-align: left;
    margin-bottom: var(--space-md);
}

.about-text p {
    color: var(--color-slate-light);
    margin-bottom: var(--space-md);
    line-height: 1.8;
}

.about-image {
    position: relative;
}

.about-image-frame {
    position: relative;
    padding: var(--space-md);
    border: 1px solid var(--color-copper);
}

.about-image-frame::before {
    content: '';
    position: absolute;
    top: var(--space-sm);
    left: var(--space-sm);
    right: calc(-1 * var(--space-sm));
    bottom: calc(-1 * var(--space-sm));
    border: 1px solid var(--color-copper);
    z-index: -1;
}

.about-image-frame img {
    width: 100%;
    height: auto;
    filter: grayscale(20%) contrast(1.1);
}

/* ============================================
   Newsletter
   ============================================ */
.newsletter {
    padding: var(--space-3xl) var(--space-xl);
    background: var(--color-slate-dark);
    text-align: center;
}

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

.newsletter h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 400;
    color: var(--color-cream);
    margin-bottom: var(--space-md);
}

.newsletter p {
    color: rgba(245, 240, 235, 0.7);
    margin-bottom: var(--space-lg);
}

.newsletter-form {
    display: flex;
    gap: var(--space-sm);
    max-width: 500px;
    margin: 0 auto;
}

.newsletter-form input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-cream);
    outline: none;
    transition: var(--transition-base);
}

.newsletter-form input::placeholder {
    color: rgba(245, 240, 235, 0.5);
}

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

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-2xl) var(--space-xl) var(--space-lg);
    background: var(--color-slate);
    color: var(--color-cream);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    max-width: 1200px;
    margin: 0 auto var(--space-2xl);
}

.footer-brand .logo {
    color: var(--color-cream);
    margin-bottom: var(--space-sm);
    display: inline-block;
}

.footer-brand p {
    color: rgba(245, 240, 235, 0.6);
    font-size: 0.9375rem;
}

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

.footer-column h4 {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-copper);
    margin-bottom: var(--space-md);
}

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

.footer-column a {
    font-size: 0.9375rem;
    color: rgba(245, 240, 235, 0.7);
}

.footer-column a:hover {
    color: var(--color-cream);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(245, 240, 235, 0.5);
}

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

.social-links a {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: rgba(245, 240, 235, 0.7);
}

.social-links a:hover {
    color: var(--color-copper);
}

/* ============================================
   Modal
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(26, 29, 35, 0.9);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-base);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-cream);
    max-width: 1000px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlide 0.4s ease;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--color-slate);
    z-index: 10;
    transition: var(--transition-base);
}

.modal-close:hover {
    color: var(--color-copper);
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.modal-image {
    background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-cream-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.modal-image img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
}

.modal-details {
    padding: var(--space-xl);
}

.modal-category {
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-copper);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
    color: var(--color-slate);
    margin: var(--space-sm) 0;
}

.modal-price {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-slate);
    margin-bottom: var(--space-md);
}

.modal-description {
    color: var(--color-slate-light);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.modal-specs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-white);
}

.spec-item {
    display: flex;
    flex-direction: column;
}

.spec-label {
    font-size: 0.625rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-slate-light);
}

.spec-value {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-slate);
}

.modal-variants {
    margin-bottom: var(--space-lg);
}

.modal-variants h4 {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-slate);
    margin-bottom: var(--space-sm);
}

.variant-options {
    display: flex;
    gap: var(--space-xs);
}

.variant-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid transparent;
    transition: var(--transition-base);
}

.variant-btn:hover,
.variant-btn.active {
    border-color: var(--color-slate);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: calc(var(--space-2xl) + 80px);
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-cta-group {
        justify-content: center;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: var(--space-lg);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .about-text {
        margin: 0 auto;
    }
    
    .about-text .section-title {
        text-align: center;
    }
    
    .modal-body {
        grid-template-columns: 1fr;
    }
    
    .modal-image {
        padding: var(--space-lg);
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-cta {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }