/* ==================== */
/* CSS Reset & Base     */
/* ==================== */

/* Font Loading Optimization */
@font-face {
    font-family: 'Cormorant Garamond';
    font-display: swap;
}

@font-face {
    font-family: 'Noto Serif JP';
    font-display: swap;
}

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

:root {
    /* Colors - 落ち着いたニュートラルトーン */
    --primary-color: #2c2c2c;
    --secondary-color: #6b6b6b;
    --accent-color: #a08968;
    --background-light: #f8f6f3;
    --background-white: #ffffff;
    --text-dark: #2c2c2c;
    --text-medium: #6b6b6b;
    --text-light: #999999;
    --border-color: #e0ddd8;
    
    /* Typography */
    --font-serif: 'Cormorant Garamond', 'Noto Serif JP', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans JP', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Performance */
    --gpu-acceleration: translateZ(0);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-dark);
    line-height: 1.8;
    background-color: var(--background-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

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

.pc-only {
    display: inline;
}

/* ==================== */
/* Header               */
/* ==================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(180deg, 
        rgba(248, 246, 243, 0.85) 0%, 
        rgba(255, 255, 255, 0.75) 100%);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    z-index: 1000;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(224, 221, 216, 0.3);
    box-shadow: 0 2px 20px rgba(160, 137, 104, 0.08);
    transition: var(--transition-smooth);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition-smooth);
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.5);
}

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

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

.nav-link {
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    color: var(--text-medium);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-color);
    transition: var(--transition-smooth);
}

.nav-link:hover {
    color: var(--accent-color);
}

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

/* Cart Link & Badge */
.cart-link {
    position: relative;
}

.cart-count {
    position: absolute;
    top: -8px;
    right: -10px;
    background-color: var(--accent-color);
    color: var(--background-white);
    min-width: 20px;
    height: 20px;
    padding: 0 5px;
    border-radius: 10px;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    line-height: 1;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    animation: badgePop 0.3s ease;
}

@keyframes badgePop {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

/* ==================== */
/* Hero Section         */
/* ==================== */

.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 70px;
}

.hero-image-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.3),
        rgba(0, 0, 0, 0.5)
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--background-white);
}

.hero-text {
    animation: fadeInUp 1.2s ease-out;
}

.hero-subtitle {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 4.5rem;
    font-weight: 300;
    letter-spacing: 0.4em;
    margin-bottom: 2rem;
}

.hero-divider {
    width: 80px;
    height: 1px;
    background-color: var(--background-white);
    margin: 0 auto 2rem;
    opacity: 0.8;
}

.hero-description {
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    line-height: 2;
    opacity: 0.95;
}

.hero-btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border: 2px solid var(--background-white);
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    color: var(--background-white);
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.hero-btn:hover {
    background-color: var(--background-white);
    color: var(--primary-color);
}

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

/* ==================== */
/* Section Common       */
/* ==================== */

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

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.section-divider {
    width: 60px;
    height: 1px;
    background-color: var(--accent-color);
    margin: 0 auto;
}

/* ==================== */
/* Concept Section      */
/* ==================== */

.concept {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-light);
}

.concept-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.concept-text {
    padding-right: 2rem;
}

.concept-heading {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.concept-paragraph {
    font-size: 1rem;
    line-height: 2;
    letter-spacing: 0.05em;
    color: var(--text-medium);
    margin-bottom: 1.5rem;
}

.concept-paragraph.last {
    margin-bottom: 0;
}

.concept-image {
    width: 100%;
    height: 500px;
    overflow: hidden;
    border-radius: 2px;
}

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

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

/* ==================== */
/* Collection Section   */
/* ==================== */

.collection {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-white);
}

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

.collection-item {
    text-align: center;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: var(--transition-smooth);
}

.collection-item:hover {
    transform: translateY(-5px);
}

.collection-image-wrapper {
    width: 100%;
    height: 400px;
    overflow: hidden;
    margin-bottom: 1.5rem;
    border-radius: 2px;
}

.collection-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease, filter 0.6s ease;
}

.collection-item:hover .collection-image {
    transform: scale(1.08);
    filter: brightness(1.05);
}

.collection-name {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.collection-description {
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    color: var(--text-light);
}

.btn-view-all {
    display: inline-block;
    padding: 1rem 3rem;
    border: 2px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.btn-view-all:hover {
    background-color: var(--primary-color);
    color: var(--background-white);
}

/* ==================== */
/* Contact Section      */
/* ==================== */

.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--background-light);
}

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

.contact-text {
    font-size: 1rem;
    line-height: 2;
    letter-spacing: 0.05em;
    color: var(--text-medium);
    margin-bottom: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-size: 1rem;
    color: var(--text-medium);
}

.contact-item i {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.social-links {
    display: flex;
    gap: 2rem;
    justify-content: center;
}

.social-link {
    width: 45px;
    height: 45px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-medium);
    transition: var(--transition-smooth);
}

.social-link:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--background-white);
    transform: translateY(-3px);
}

.social-link i {
    font-size: 1.1rem;
}

.btn-contact {
    display: inline-block;
    padding: 1rem 2.5rem;
    border: 2px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    font-size: 1rem;
    letter-spacing: 0.1em;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.btn-contact:hover {
    background-color: var(--primary-color);
    color: var(--background-white);
}

/* ==================== */
/* Footer               */
/* ==================== */

.footer {
    padding: 3rem 0 2rem;
    background-color: var(--primary-color);
    color: var(--background-light);
    text-align: center;
}

.footer-brand {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    margin-bottom: 0.5rem;
}

.footer-text {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.footer-legal-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin: 1rem 0 1.5rem;
    flex-wrap: wrap;
}

.footer-legal-links a {
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    color: var(--background-light);
    opacity: 0.8;
    transition: var(--transition-smooth);
}

.footer-legal-links a:hover {
    opacity: 1;
    color: var(--accent-color);
}

.footer-copyright {
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    opacity: 0.6;
}

/* ==================== */
/* Responsive Design    */
/* ==================== */

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .pc-only {
        display: none;
    }
    
    /* Header */
    .brand-logo {
        font-size: 1.4rem;
        letter-spacing: 0.2em;
    }
    
    .nav {
        gap: 1.5rem;
    }
    
    .nav-link {
        font-size: 0.8rem;
    }
    
    /* Hero */
    .hero {
        height: 70vh;
        margin-top: 60px;
    }
    
    .hero-subtitle {
        font-size: 0.9rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
        letter-spacing: 0.3em;
    }
    
    .hero-description {
        font-size: 0.95rem;
    }
    
    /* Section */
    .section-title {
        font-size: 2rem;
    }
    
    /* Concept */
    .concept {
        padding: var(--spacing-lg) 0;
    }
    
    .concept-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .concept-text {
        padding-right: 0;
        order: 2;
    }
    
    .concept-image {
        order: 1;
        height: 350px;
    }
    
    .concept-heading {
        font-size: 1.5rem;
    }
    
    .concept-paragraph {
        font-size: 0.95rem;
    }
    
    /* Collection */
    .collection {
        padding: var(--spacing-lg) 0;
    }
    
    .collection-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    
    .collection-image-wrapper {
        height: 350px;
    }
    
    /* Contact */
    .contact {
        padding: var(--spacing-lg) 0;
    }
    
    .contact-text {
        font-size: 0.95rem;
    }
    
    .social-links {
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    /* Header */
    .header {
        padding: 1rem 0;
    }
    
    .brand-logo {
        font-size: 1.2rem;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.75rem;
    }
    
    /* Hero */
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 0.9rem;
    }
    
    /* Section */
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-header {
        margin-bottom: var(--spacing-lg);
    }
    
    /* Concept */
    .concept-image {
        height: 280px;
    }
    
    /* Collection */
    .collection-image-wrapper {
        height: 300px;
    }
    
    .collection-name {
        font-size: 1.3rem;
    }
}