/* ===========================
   CSS Variables
   =========================== */
:root {
    /* Colors */
    --color-white: #FFFFFF;
    --color-bg-light: #F8F8F8;
    --color-bg-gray: #F0F0F0;
    --color-text-dark: #1A1A1A;
    --color-text-muted: #666666;
    --color-text-light: #999999;
    --color-border: #E5E5E5;
    --color-black: #000000;

    /* Typography */
    --font-ja: 'Noto Sans JP', sans-serif;
    --font-en: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-ja);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

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

/* ===========================
   Header
   =========================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    font-family: var(--font-en);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-dark);
}

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-list a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-text-dark);
    transition: var(--transition-fast);
}

/* ===========================
   Hero Section
   =========================== */
.hero {
    padding: calc(70px + var(--spacing-3xl)) 0 var(--spacing-3xl);
    background-color: var(--color-white);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 480px;
}

.hero-image img {
    border-radius: 12px;
    object-fit: cover;
    width: 100%;
    height: 400px;
}

/* ===========================
   Section Header
   =========================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

.section-description {
    font-size: 1rem;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ===========================
   Features Section
   =========================== */
.features {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

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

.feature-card {
    text-align: center;
}

.feature-image {
    margin-bottom: var(--spacing-md);
    border-radius: 12px;
    overflow: hidden;
}

.feature-image img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: var(--transition-normal);
}

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

.feature-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
}

.features-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xl);
}

.nav-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-border);
    transition: var(--transition-fast);
}

.nav-dot.active {
    background-color: var(--color-text-dark);
}

/* ===========================
   Benefits Section
   =========================== */
.benefits {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-light);
}

.benefits-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.benefit-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.benefit-icon {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-white);
    border-radius: 12px;
    color: var(--color-text-dark);
}

.benefit-text h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.benefit-text p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.benefits-image img {
    border-radius: 12px;
    width: 100%;
    height: 500px;
    object-fit: cover;
}

/* ===========================
   Gallery Section
   =========================== */
.gallery {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

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

.gallery-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 16 / 9;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.gallery-item iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

/* ===========================
   CTA Section
   =========================== */
.cta {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.cta-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.cta-description {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--color-black);
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition-fast);
}

.cta-button:hover {
    background-color: var(--color-text-dark);
    transform: translateY(-2px);
}

.cta-image img {
    border-radius: 12px;
    width: 100%;
    height: 350px;
    object-fit: cover;
}

/* ===========================
   Footer
   =========================== */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    background-color: var(--color-bg-light);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--color-border);
}

.footer-label {
    font-family: var(--font-en);
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-transform: lowercase;
}

.footer-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin: var(--spacing-sm) 0;
}

.footer-description {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-dark);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-ja);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background-color: var(--color-white);
    transition: var(--transition-fast);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-text-dark);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-light);
}

.form-button {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-white);
    background-color: var(--color-black);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
    align-self: flex-start;
}

.form-button:hover {
    background-color: var(--color-text-dark);
    transform: translateY(-2px);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-contact svg {
    flex-shrink: 0;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-2xl);
    justify-content: flex-end;
}

.footer-nav-column h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-nav-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-nav-column a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-nav-column a:hover {
    color: var(--color-text-dark);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
}

.footer-social {
    display: flex;
    gap: var(--spacing-md);
}

.footer-social a {
    color: var(--color-text-muted);
}

.footer-social a:hover {
    color: var(--color-text-dark);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-description {
        margin: 0 auto;
    }

    .hero-image {
        order: -1;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .benefits-content {
        grid-template-columns: 1fr;
    }

    .benefits-image {
        order: -1;
    }

    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .cta-image {
        order: -1;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-nav {
        justify-content: flex-start;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

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

    .section-title {
        font-size: 1.5rem;
    }

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

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

    .footer-nav {
        flex-direction: column;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
    }

    .hero {
        padding: calc(70px + var(--spacing-xl)) 0 var(--spacing-xl);
    }

    .hero-image img {
        height: 280px;
    }

    .feature-image img {
        height: 180px;
    }

    .gallery-item img {
        height: 200px;
    }

    .benefits-image img {
        height: 300px;
    }

    .cta-image img {
        height: 250px;
    }
}