/* Woodcarved - Unified Design System */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500&family=Noto+Serif+JP:wght@400;500&display=swap');

/* CSS Variables for consistent theming */
:root {
    --primary-bg: #f8f6f0;
    --text-primary: #2d2d2d;
    --text-secondary: #6b6b6b;
    --accent-color: #8b4513;
    --border-color: rgba(45, 45, 45, 0.08);
    --header-bg: rgba(248, 246, 240, 0.9);
    --font-primary: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Noto Serif JP', serif;
    --line-height: 1.8;
    --letter-spacing: 0.02em;
    --border-radius: 8px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: var(--line-height);
    font-weight: 300;
    overflow-x: hidden;
    letter-spacing: var(--letter-spacing);
}

/* Header */
header {
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
    position: relative;
    width: 100%;
}

nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: 0.1em;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 4rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 300;
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
    letter-spacing: 0.1em;
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-color);
    transition: width 0.5s ease;
}

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

/* Back link for product pages */
.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2rem;
    display: inline-block;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--text-primary);
}

/* Sections */
.section {
    padding: 12rem 4rem 8rem;
    max-width: 1200px;
    margin: 0 auto;
}

.product-page {
    padding: 8rem 3rem 6rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Typography */
h1 {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.4;
    margin-bottom: 1rem;
}

h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-weight: 400;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.btn:hover {
    background: #654332;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

/* Cards */
.card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

input, textarea, select {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: white;
    font-family: var(--font-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(139, 69, 19, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        padding: 0 2rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        gap: 2rem;
    }
    
    .section, .product-page {
        padding: 8rem 2rem 4rem;
    }
    
    h1 {
        font-size: 2.2rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
}

@media (max-width: 480px) {
    .nav-links {
        gap: 1.5rem;
        font-size: 0.8rem;
    }
    
    .section, .product-page {
        padding: 8rem 1.5rem 4rem;
    }
    
    h1 {
        font-size: 1.8rem;
    }
}