/* ==========================================
   SERIAE - Modern Vintage Japan Aesthetic
   ========================================== */

/* Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;600&family=Zen+Kaku+Gothic+New:wght@300;400;500;700&family=Yuji+Boku&display=swap');

/* CSS Variables - Color Palette */
:root {
    /* Primary Colors - Modern Vintage Japan */
    --parchment: #F5F1E8;
    --espresso: #2D2420;
    --indigo: #4A5568;
    --muted-red: #A8503F;
    --brass: #B8956A;

    /* Supporting Neutrals */
    --warm-white: #FDFBF7;
    --soft-gray: #E8E4DC;
    --charcoal: #3A3632;
    --cream: #F9F6F0;

    /* Typography */
    --font-body: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Zen Kaku Gothic New', sans-serif;
    --font-accent: 'Yuji Boku', serif;

    /* Spacing Scale - Generous breathing room */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-2xl: 8rem;

    /* Layout */
    --max-width: 1400px;
    --content-width: 1200px;
    --narrow-width: 800px;
}

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

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

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

body {
    font-family: var(--font-body);
    font-weight: 300;
    line-height: 1.8;
    color: var(--espresso);
    background-color: var(--parchment);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: var(--space-md);
    color: var(--charcoal);
}

h1 {
    font-size: 3.5rem;
    font-weight: 300;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    font-weight: 400;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.75rem;
    font-weight: 400;
}

h4 {
    font-size: 1.25rem;
    font-weight: 500;
}

.accent-text {
    font-family: var(--font-accent);
    font-size: 1.1rem;
    color: var(--muted-red);
    letter-spacing: 0.02em;
}

p {
    margin-bottom: var(--space-md);
    color: var(--indigo);
}

a {
    color: var(--charcoal);
    text-decoration: none;
    transition: color 0.3s ease, opacity 0.3s ease;
}

a:hover {
    color: var(--muted-red);
}

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

.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(245, 241, 232, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(58, 54, 50, 0.08);
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-accent);
    font-size: 1.5rem;
    letter-spacing: 0.05em;
    color: var(--espresso);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.03em;
    text-transform: lowercase;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--muted-red);
    transition: width 0.3s ease;
}

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

.lang-toggle {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: opacity 0.3s ease;
}

.lang-toggle:hover {
    opacity: 0.7;
}

.lang-toggle .lang-en,
.lang-toggle .lang-jp {
    transition: color 0.3s ease, font-weight 0.3s ease;
}

body[data-lang="en"] .lang-toggle .lang-en {
    color: var(--accent-orange);
    font-weight: 600;
}

body[data-lang="ja"] .lang-toggle .lang-jp {
    color: var(--accent-orange);
    font-weight: 600;
}

/* ==========================================
   LANGUAGE TOGGLE - CONTENT VISIBILITY
   ========================================== */

/* Default: Show English, Hide Japanese */
.lang-ja {
    display: none;
}

.lang-en {
    display: inline;
}

/* When Japanese is selected: Hide English, Show Japanese */
body[data-lang="ja"] .lang-ja {
    display: inline;
}

body[data-lang="ja"] .lang-en {
    display: none;
}

/* Block-level language elements */
.lang-ja-block {
    display: none;
}

.lang-en-block {
    display: block;
}

body[data-lang="ja"] .lang-ja-block {
    display: block;
}

body[data-lang="ja"] .lang-en-block {
    display: none;
}

/* ==========================================
   LAYOUT CONTAINERS
   ========================================== */

.page-content {
    padding-top: 100px; /* Account for fixed nav */
    min-height: 100vh;
}

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

.narrow-container {
    max-width: var(--narrow-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

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

/* ==========================================
   HERO SECTION - IMMERSIVE VIDEO INTRO
   ========================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: var(--espresso);
}

/* Static Image Background */
.hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('images/hero-handbag.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 0;
}

/* Video Background */
.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translateX(-50%) translateY(-50%);
    z-index: 0;
    object-fit: cover;
    display: none; /* Hidden by default, use image instead */
}

/* Darkening overlay for text readability */
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom,
        rgba(45, 36, 32, 0.5),
        rgba(45, 36, 32, 0.7));
    z-index: 1;
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 2;
}

/* Staggered fade-in animations */
.hero-logo {
    font-family: var(--font-accent);
    font-size: 4.5rem;
    color: #FFFFFF;
    letter-spacing: 0.2em;
    margin-bottom: var(--space-md);
    font-weight: 300;
    opacity: 0;
    animation: fadeInUp 1.5s ease-out forwards;
    animation-delay: 0s;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero h1 {
    margin-bottom: var(--space-xl);
    color: #FFFFFF;
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    opacity: 0;
    animation: fadeInUp 1.5s ease-out forwards;
    animation-delay: 1.5s;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--soft-gray);
    max-width: 600px;
    margin: 0 auto var(--space-xl);
    line-height: 2;
    opacity: 0;
    animation: fadeInUp 1.5s ease-out forwards;
    animation-delay: 2s;
}

.hero-cta {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    background-color: var(--espresso);
    color: #FFFFFF;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border: 2px solid var(--brass);
    border-radius: 0;
    transition: all 0.4s ease;
    cursor: pointer;
}

.hero-cta:hover {
    background-color: var(--brass);
    color: var(--espresso);
    border-color: var(--brass);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(184, 149, 106, 0.5);
}

/* Enter Collection Button (special styling for hero) */
.enter-collection-btn {
    display: inline-block;
    padding: var(--space-md) var(--space-2xl);
    background-color: rgba(184, 149, 106, 0.2);
    color: #FFFFFF;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    border: 2px solid var(--brass);
    cursor: pointer;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    opacity: 0;
    animation: fadeInUp 1.5s ease-out forwards;
    animation-delay: 3s;
}

.enter-collection-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--brass);
    transition: left 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

.enter-collection-btn:hover {
    color: var(--espresso);
    border-color: var(--brass);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(184, 149, 106, 0.6);
    text-shadow: none;
}

.enter-collection-btn:hover::before {
    left: 0;
}

/* Scroll Down Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    opacity: 0;
    animation: fadeIn 1s ease-out forwards, bounce 2s infinite;
    animation-delay: 4s, 4s;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 40px;
    border: 2px solid var(--brass);
    border-radius: 20px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    width: 4px;
    height: 8px;
    background: var(--brass);
    border-radius: 2px;
    transform: translateX(-50%);
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0%, 20% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    100% {
        transform: translateX(-50%) translateY(16px);
        opacity: 0;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ==========================================
   PRODUCT GRID
   ========================================== */

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

.product-card {
    background-color: var(--warm-white);
    border-radius: 4px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(45, 36, 32, 0.08);
}

.product-image {
    width: 100%;
    aspect-ratio: 3/4;
    background-color: var(--soft-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.product-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent, rgba(45, 36, 32, 0.03));
}

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

.product-placeholder {
    font-family: var(--font-accent);
    color: var(--brass);
    font-size: 2rem;
}

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

.product-brand {
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    color: var(--indigo);
    margin-bottom: var(--space-xs);
}

.product-name {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 400;
    margin-bottom: var(--space-sm);
    color: var(--charcoal);
}

.product-price {
    font-size: 1rem;
    color: var(--espresso);
    font-weight: 500;
}

/* ==========================================
   FEATURED SECTION
   ========================================== */

.featured-section {
    background-color: var(--cream);
    padding: var(--space-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-title {
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    color: var(--indigo);
    font-size: 1rem;
}

/* ==========================================
   PRODUCT DETAIL PAGE
   ========================================== */

.product-detail {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--space-xl);
    padding: var(--space-xl) 0;
}

.product-gallery {
    background-color: var(--cream);
    aspect-ratio: 4/5;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.product-details {
    padding: var(--space-lg) 0;
}

.product-meta {
    margin-bottom: var(--space-md);
}

.product-category {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    color: var(--brass);
    text-transform: uppercase;
    margin-bottom: var(--space-xs);
}

.product-title {
    font-size: 2.5rem;
    margin-bottom: var(--space-sm);
}

.product-price-large {
    font-size: 1.5rem;
    color: var(--espresso);
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.product-description {
    line-height: 2;
    margin-bottom: var(--space-lg);
    color: var(--indigo);
}

.add-to-cart {
    width: 100%;
    padding: var(--space-md);
    background-color: var(--espresso);
    color: #FFFFFF;
    border: 2px solid var(--brass);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.add-to-cart:hover {
    background-color: var(--brass);
    color: var(--espresso);
    border-color: var(--brass);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(184, 149, 106, 0.4);
}

/* ==========================================
   ABOUT PAGE
   ========================================== */

.about-hero {
    text-align: center;
    padding: var(--space-2xl) 0 var(--space-xl);
}

.about-content {
    max-width: var(--narrow-width);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.about-content p {
    font-size: 1.1rem;
    line-height: 2.2;
    margin-bottom: var(--space-lg);
}

.philosophy-section {
    background-color: var(--cream);
    padding: var(--space-2xl) 0;
    margin: var(--space-xl) 0;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.philosophy-item h3 {
    font-family: var(--font-accent);
    font-size: 1.3rem;
    color: var(--muted-red);
    margin-bottom: var(--space-sm);
}

/* ==========================================
   CONTACT PAGE
   ========================================== */

.contact-container {
    max-width: var(--narrow-width);
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-lg);
}

.contact-info {
    margin-bottom: var(--space-xl);
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contact-method {
    padding: var(--space-md);
    background-color: var(--cream);
    border-radius: 4px;
}

.contact-method h4 {
    margin-bottom: var(--space-xs);
}

.contact-method p {
    color: var(--indigo);
    margin: 0;
}

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

footer {
    background-color: var(--espresso);
    color: var(--parchment);
    padding: var(--space-xl) 0 var(--space-md);
    margin-top: var(--space-2xl);
}

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

.footer-section h4 {
    color: var(--brass);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-links a {
    color: var(--soft-gray);
    font-size: 0.95rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid rgba(184, 149, 106, 0.2);
    color: var(--soft-gray);
    font-size: 0.85rem;
}

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

@media (max-width: 768px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 3rem;
        --space-2xl: 4rem;
    }

    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .nav-links {
        gap: var(--space-md);
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: var(--space-md);
    }

    .product-detail {
        grid-template-columns: 1fr;
    }

    .hero {
        min-height: 70vh;
    }

    .hero-logo {
        font-size: 3rem;
        letter-spacing: 0.15em;
    }

    .hero h1 {
        font-size: 1.4rem;
    }

    .enter-collection-btn {
        padding: var(--space-sm) var(--space-lg);
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    nav {
        padding: var(--space-md);
    }

    .nav-links {
        gap: var(--space-sm);
        font-size: 0.85rem;
    }

    h1 {
        font-size: 2rem;
    }

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

    .hero-logo {
        font-size: 2.5rem;
        letter-spacing: 0.1em;
    }

    .hero h1 {
        font-size: 1.2rem;
    }

    .enter-collection-btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.75rem;
        letter-spacing: 0.1em;
    }
}

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

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

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

.mb-xl {
    margin-bottom: var(--space-xl);
}

.mt-lg {
    margin-top: var(--space-lg);
}

.fade-in {
    animation: fadeIn 0.6s ease-in;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Scroll-triggered fade-in animations */
.fade-in-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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