/* ===== CSS Variables ===== */
:root {
    /* Colors - Dark & Gold Theme */
    --primary-color: #1a1a1a;
    --secondary-color: #d4af37;
    --accent-color: #f4f4f4;
    --text-color: #ffffff;
    --text-light: #cccccc;
    --text-dark: #333333;
    --bg-dark: #0a0a0a;
    --bg-light: #1a1a1a;
    --white: #ffffff;
    --border-color: #333333;
    --gold: #d4af37;
    --gold-light: #e6c757;
    
    /* Typography */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-secondary: 'Montserrat', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Layout */
    --max-width: 1200px;
    --border-radius: 0;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-color);
    line-height: 1.7;
    background-color: var(--bg-dark);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* ===== Layout ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

section {
    padding: var(--spacing-xxl) 0;
    position: relative;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: 0.05em;
}

.section-title {
    font-size: 3.5rem;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-color);
    font-weight: 100;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border: 1px solid var(--gold);
    color: var(--gold);
    background: transparent;
    font-weight: 400;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gold);
    transition: var(--transition);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

.btn:hover {
    color: var(--bg-dark);
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--gold);
    color: var(--bg-dark);
}

.btn-primary::before {
    background: var(--bg-dark);
}

.btn-primary:hover {
    color: var(--gold);
}

/* ===== Header ===== */
.header {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--text-color);
    font-weight: 100;
    letter-spacing: 0.2em;
}

.logo small {
    display: block;
    font-size: 0.7rem;
    color: var(--gold);
    margin-top: 2px;
    letter-spacing: 0.3em;
}

.nav-list {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-list a {
    font-weight: 300;
    color: var(--text-light);
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    position: relative;
    transition: var(--transition);
}

.nav-list a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -8px;
    left: 0;
    background: var(--gold);
    transition: var(--transition);
}

.nav-list a:hover {
    color: var(--gold);
}

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

.btn-reservation {
    background: var(--gold);
    color: var(--bg-dark) !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border: 1px solid var(--gold);
    font-size: 0.8rem;
}

.btn-reservation:hover::after {
    display: none;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    flex-direction: column;
    gap: 4px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 1px;
    background-color: var(--text-color);
    transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
    background: var(--bg-dark);
    padding: calc(var(--spacing-xxl) + 100px) 0 var(--spacing-xxl);
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1) 0%, rgba(10, 10, 10, 0.8) 100%);
    z-index: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: 4.5rem;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    font-weight: 100;
    line-height: 1.1;
    letter-spacing: 0.05em;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--gold);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    letter-spacing: 0.2em;
}

.hero-description {
    font-size: 1rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-light);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.hero-image {
    position: relative;
    text-align: center;
}

.hero-image img {
    width: 100%;
    height: 600px;
    object-fit: cover;
    filter: grayscale(20%) contrast(1.1);
    transition: var(--transition);
}

.hero-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(212, 175, 55, 0.2), transparent);
    pointer-events: none;
}

/* ===== Features Section ===== */
.features {
    background: var(--bg-light);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xxl);
    margin-top: var(--spacing-xl);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(212, 175, 55, 0.05);
    border: 1px solid rgba(212, 175, 55, 0.2);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.feature-item:hover::before {
    opacity: 1;
}

.feature-item:hover {
    transform: translateY(-10px);
    border-color: var(--gold);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-dark);
    position: relative;
}

.feature-icon::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    right: 2px;
    bottom: 2px;
    background: var(--bg-dark);
    z-index: 1;
}

.feature-icon svg {
    width: 40px;
    height: 40px;
    position: relative;
    z-index: 2;
    color: var(--gold);
}

.feature-item h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    font-weight: 300;
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.8;
}

/* ===== Works Section ===== */
.works {
    background: var(--bg-dark);
    position: relative;
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xxl);
    margin-top: var(--spacing-xl);
}

.work-item {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.work-item:hover {
    transform: translateY(-5px);
    border-color: var(--gold);
    box-shadow: var(--shadow);
}

.work-image {
    overflow: hidden;
    position: relative;
}

.work-image img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    transition: var(--transition);
    filter: grayscale(30%);
}

.work-item:hover .work-image img {
    transform: scale(1.05);
    filter: grayscale(0%);
}

.work-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(212, 175, 55, 0.3), transparent);
    opacity: 0;
    transition: var(--transition);
}

.work-item:hover .work-image::after {
    opacity: 1;
}

.work-info {
    padding: var(--spacing-lg);
}

.work-info h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    font-weight: 300;
}

.work-info p {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.work-area {
    font-size: 0.9rem;
    color: var(--gold);
    font-weight: 400;
    letter-spacing: 0.05em;
}

/* ===== Contact Section ===== */
.contact {
    background: var(--bg-light);
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.contact-info h3 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: var(--spacing-lg);
    font-weight: 100;
    letter-spacing: 0.05em;
}

.contact-info > p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xxl);
    line-height: 1.8;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xxl);
}

.contact-method {
    background: rgba(212, 175, 55, 0.05);
    padding: var(--spacing-xxl);
    border: 1px solid rgba(212, 175, 55, 0.2);
    transition: var(--transition);
    position: relative;
}

.contact-method:hover {
    border-color: var(--gold);
    transform: translateY(-5px);
}

.contact-method h4 {
    font-size: 1.5rem;
    color: var(--text-color);
    margin-bottom: var(--spacing-md);
    font-weight: 300;
}

.phone-number {
    font-size: 2rem;
    font-weight: 300;
    color: var(--gold);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.1em;
}

.business-hours {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== Scroll Animations ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

/* ===== Custom Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--gold);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gold-light);
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .nav-list {
        position: fixed;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .hero {
        padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-xl);
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .btn {
        padding: var(--spacing-xs) var(--spacing-md);
    }

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

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

    .section-title {
        font-size: 2rem;
    }

    .contact-methods {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-xs);
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .feature-item {
        padding: var(--spacing-md);
    }

    .work-info {
        padding: var(--spacing-sm);
    }
}