@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300&family=Inter:wght@300;400;500;600&family=Noto+Sans+JP:wght@300;400;500;700&family=Noto+Serif+JP:wght@300;400;600;700&display=swap');

/* --- Reset & Base Styles --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Color Palette */
    --color-primary-slate: #5b5f6a;
    --color-accent-blue: #95a4b7;
    --color-light-gray: #f2f2f2;
    --color-white: #ffffff;
    
    /* Text Colors */
    --color-text-main: #000000; /* Black for high contrast body */
    --color-text-dark: #000000; /* Black for headings */
    --color-text-muted: #000000; /* Black for subtitles, labels and captions */
    --color-border: #d2d5da; /* Light blue-gray border line */
    --color-border-light: rgba(149, 164, 183, 0.2);

    /* Fonts */
    --font-serif-en: 'Cormorant Garamond', serif;
    --font-serif-jp: 'Noto Serif JP', serif;
    --font-sans-en: 'Inter', sans-serif;
    --font-sans-jp: 'Noto Sans JP', sans-serif;

    /* Spacing & Transitions */
    --transition-smooth: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-fast: all 0.3s ease;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.75rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4.5rem;
    
    --header-height: 80px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    background-color: var(--color-white);
}

body {
    font-family: var(--font-sans-jp), var(--font-sans-en), sans-serif;
    color: var(--color-text-main);
    background-color: var(--color-white);
    line-height: 1.8;
    letter-spacing: 0.05em;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif-jp), var(--font-serif-en), serif;
    color: var(--color-text-dark);
    font-weight: 400;
    line-height: 1.4;
    letter-spacing: 0.08em;
}

p {
    margin-bottom: 1.5rem;
    font-weight: 300;
}

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

/* English labels / Subtitles */
.label-en {
    font-family: var(--font-serif-en);
    font-style: italic;
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: #E2A100;
    display: block;
    margin-bottom: 0.5rem;
}

/* --- Layout Utilities --- */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 5%;
}

.section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.section-bg-gray {
    background-color: var(--color-light-gray);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 992px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    .section {
        padding: var(--spacing-lg) 0;
    }
}

/* --- Components & Buttons --- */
.btn-premium {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    font-family: var(--font-serif-en), var(--font-sans-jp);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-white);
    background-color: var(--color-primary-slate);
    border: 1px solid var(--color-primary-slate);
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: var(--transition-smooth);
}

.btn-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-accent-blue);
    z-index: -1;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-premium:hover::before {
    transform: scaleX(1);
    transform-origin: left;
}

.btn-premium:hover {
    color: var(--color-white);
    border-color: var(--color-accent-blue);
    box-shadow: 0 4px 15px rgba(91, 95, 106, 0.15);
}

.btn-premium:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    box-shadow: none;
    pointer-events: none;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    font-family: var(--font-serif-en), var(--font-sans-jp);
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-primary-slate);
    background-color: transparent;
    border: 1px solid var(--color-accent-blue);
    transition: var(--transition-smooth);
}

.btn-outline:hover {
    background-color: var(--color-primary-slate);
    color: var(--color-white);
    border-color: var(--color-primary-slate);
}

/* --- Sticky Header / Navigation --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--color-border-light);
    transition: var(--transition-smooth);
}

.site-header.scrolled {
    height: 70px;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 5px 25px rgba(91, 95, 106, 0.05);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo a {
    display: flex;
    flex-direction: column;
}

.logo-main {
    font-family: var(--font-sans-jp);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: #004061;
}

.logo-sub {
    font-family: var(--font-serif-en);
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--color-accent-blue);
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-main);
    position: relative;
    padding: 0.5rem 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.nav-link span {
    font-family: var(--font-sans-jp);
}

.nav-link .nav-en {
    font-family: var(--font-serif-en);
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent-blue);
    opacity: 0.8;
    margin-top: 2px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--color-primary-slate);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text-dark);
}

.nav-link.active {
    font-weight: 600;
}

.nav-link.active .nav-en {
    color: var(--color-primary-slate);
    opacity: 1;
}

/* Mobile Hamburger Menu */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger-line {
    display: block;
    width: 25px;
    height: 1px;
    margin: 6px auto;
    background-color: var(--color-text-dark);
    transition: var(--transition-fast);
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background-color: var(--color-white);
        box-shadow: -10px 0 30px rgba(0,0,0,0.05);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-md);
        transition: var(--transition-smooth);
    }
    
    .nav-menu.open {
        right: 0;
    }
    
    .hamburger.open .hamburger-line:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    
    .hamburger.open .hamburger-line:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.open .hamburger-line:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
}

/* --- Site Footer --- */
.site-footer {
    background-color: var(--color-primary-slate);
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-brand .logo-main {
    color: var(--color-white);
}

.footer-brand .logo-sub {
    color: rgba(255, 255, 255, 0.5);
}

.footer-description {
    margin-top: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.60);
    font-size: 0.85rem;
    max-width: 400px;
}

.footer-links h4, .footer-contact h4 {
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.1em;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.85rem;
}

.footer-links a:hover {
    color: var(--color-white);
    padding-left: 5px;
}

.footer-contact p {
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.footer-contact .tel {
    font-family: var(--font-sans-en);
    font-size: 1.2rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
}

.footer-nav-links {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.45);
}

.copyright {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.45);
    font-family: var(--font-sans-en);
}

@media (max-width: 992px) {
    .footer-top {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-bottom {
        flex-direction: column-reverse;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

/* --- Scroll Reveal Animations --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 1s cubic-bezier(0.16, 1, 0.3, 1), transform 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Image Hover Zoom Container */
.zoom-img-container {
    overflow: hidden;
    position: relative;
    background-color: var(--color-light-gray);
}

.zoom-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.zoom-img-container:hover .zoom-img {
    transform: scale(1.05);
}

/* Decorative Divider Lines */
.divider-line {
    width: 100%;
    height: 1px;
    background-color: var(--color-border-light);
    margin: var(--spacing-md) 0;
}