@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;600;700&family=Inter:wght@300;400;500;600&display=swap');

:root {
    --color-black: #0F1110;
    --color-white: #FFFFFF;
    --color-washi: #F7F6F2;
    --color-forest: #0D2B22;
    --color-forest-light: #164034;
    --color-accent: #8C1C13;
    --color-gray: #E2E0D9;
    --color-text: #2C2C2C;
    --color-text-light: #5A5A5A;
    
    --font-heading: 'Noto Serif JP', serif;
    --font-body: 'Inter', sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
}

* {
    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-white);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-black);
    line-height: 1.2;
    font-weight: 600;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
    color: var(--color-text-light);
}

.text-lg { font-size: 1.25rem; line-height: 1.8; }
.text-sm { font-size: 0.875rem; }

a {
    color: var(--color-forest);
    text-decoration: none;
    transition: color 0.3s ease;
}
a:hover { color: var(--color-accent); }

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

section { padding: var(--spacing-xl) 0; }
.section-sm { padding: var(--spacing-lg) 0; }

.bg-washi { background-color: var(--color-washi); }
.bg-forest { background-color: var(--color-forest); color: var(--color-white); }
.bg-forest h1, .bg-forest h2, .bg-forest h3, .bg-forest h4, .bg-forest p { color: var(--color-white); }
.bg-forest p { opacity: 0.9; }

.grid { display: grid; gap: var(--spacing-md); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

@media (min-width: 768px) {
    .grid-2 { grid-template-columns: 1fr 1fr; }
    .grid-3 { grid-template-columns: 1fr 1fr 1fr; }
    .grid-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }
}

.header {
    position: fixed;
    top: 0; left: 0; width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-gray);
    padding: 1.25rem 0;
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-black);
    letter-spacing: -0.01em;
}
.logo-accent { color: var(--color-accent); }

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-black);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
}

.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0%; height: 1px; background-color: var(--color-accent); transition: width 0.3s ease;
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.mobile-nav-toggle {
    display: none;
    cursor: pointer;
    width: 30px; height: 20px;
    position: relative;
    z-index: 1001;
}

.mobile-nav-toggle span {
    display: block; width: 100%; height: 2px; background-color: var(--color-black); position: absolute; transition: all 0.3s ease;
}
.mobile-nav-toggle span:nth-child(1) { top: 0; }
.mobile-nav-toggle span:nth-child(2) { top: 9px; }
.mobile-nav-toggle span:nth-child(3) { top: 18px; }

.mobile-nav-toggle.active span:nth-child(1) { transform: rotate(45deg); top: 9px; }
.mobile-nav-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-nav-toggle.active span:nth-child(3) { transform: rotate(-45deg); top: 9px; }

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--color-forest);
    color: var(--color-white);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.875rem;
    border: 1px solid var(--color-forest);
    transition: all 0.3s ease;
    cursor: pointer;
}
.btn:hover { background-color: var(--color-white); color: var(--color-forest); }

.btn-outline { background-color: transparent; color: var(--color-forest); border-color: var(--color-forest); }
.btn-outline:hover { background-color: var(--color-forest); color: var(--color-white); }
.bg-forest .btn-outline { border-color: var(--color-white); color: var(--color-white); }
.bg-forest .btn-outline:hover { background-color: var(--color-white); color: var(--color-forest); }

.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: 5rem;
    position: relative;
}
.hero-content { max-width: 800px; }
.hero-subtitle {
    font-family: var(--font-heading);
    color: var(--color-accent);
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    display: block;
}
.hero-description {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 3rem;
    max-width: 600px;
}

.img-fluid { width: 100%; height: auto; object-fit: cover; display: block; }
.img-aspect { aspect-ratio: 4/3; object-fit: cover; }
.img-aspect-tall { aspect-ratio: 3/4; object-fit: cover; }

.image-reveal { overflow: hidden; position: relative; }
.image-reveal img { transition: transform 0.7s ease; }
.image-reveal:hover img { transform: scale(1.05); }

.border-top { border-top: 1px solid var(--color-gray); }
.border-bottom { border-bottom: 1px solid var(--color-gray); }

.card {
    background: var(--color-white);
    padding: var(--spacing-md);
    border: 1px solid var(--color-gray);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,0.05); }
.card h3 { margin-bottom: 1rem; font-size: 1.5rem; }

.stat-item { text-align: center; padding: 2rem; border-right: 1px solid var(--color-gray); }
.stat-item:last-child { border-right: none; }
.stat-number { font-family: var(--font-heading); font-size: 3.5rem; color: var(--color-forest); line-height: 1; margin-bottom: 0.5rem; }
.stat-label { font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-light); }

@media (max-width: 767px) {
    .stat-item { border-right: none; border-bottom: 1px solid var(--color-gray); }
    .stat-item:last-child { border-bottom: none; }
}

.footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}
.footer h4 { color: var(--color-white); margin-bottom: 1.5rem; font-size: 1.25rem; }
.footer p { color: rgba(255,255,255,0.7); }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 0.75rem; }
.footer-links a { color: rgba(255,255,255,0.7); }
.footer-links a:hover { color: var(--color-white); }
.footer-bottom {
    margin-top: var(--spacing-lg); padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
}
.footer-bottom p { margin-bottom: 0; font-size: 0.875rem; }

@media (max-width: 991px) {
    .nav {
        position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        background-color: var(--color-white);
        flex-direction: column; justify-content: center; align-items: center; gap: 2rem;
        transform: translateY(-100%); transition: transform 0.4s ease-in-out; z-index: 1000;
    }
    .nav.active { transform: translateY(0); }
    .nav-link { font-size: 1.5rem; }
    .mobile-nav-toggle { display: block; }
    :root { --spacing-md: 1.5rem; --spacing-lg: 3rem; --spacing-xl: 4rem; }
}

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }