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

:root {
    /* Gray基調のスタイリッシュなカラーパレット */
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    --color-primary: #4b5563;
    --color-secondary: #6b7280;
    --color-accent: #374151;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #f9fafb;
    --color-white: #ffffff;
    --color-overlay: rgba(31, 41, 55, 0.6);
    --color-overlay-light: rgba(31, 41, 55, 0.4);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
    --transition: all 0.3s ease;
    --shadow-sm: 0 2px 4px rgba(31, 41, 55, 0.08);
    --shadow-md: 0 4px 6px rgba(31, 41, 55, 0.1);
    --shadow-lg: 0 10px 25px rgba(31, 41, 55, 0.15);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--color-gray-800);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar {
    padding: var(--spacing-sm) 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 50px;
    width: auto;
}

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

.menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--color-gray-200);
    transition: var(--transition);
}

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

.nav-link {
    color: var(--color-gray-200);
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-gray-200);
    transition: var(--transition);
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('img/hero.png');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-color: var(--color-gray-800);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(31, 41, 55, 0.75) 0%,
        rgba(55, 65, 81, 0.65) 50%,
        rgba(75, 85, 99, 0.7) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--color-white);
    padding: var(--spacing-lg) var(--spacing-md);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 300;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-white);
    color: var(--color-gray-800);
}

.btn-primary:hover {
    background-color: transparent;
    border-color: var(--color-white);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    border-color: var(--color-white);
    color: var(--color-white);
}

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-gray-800);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid var(--color-white);
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--color-white);
    border-radius: 50%;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Services Section
   ======================================== */
.services {
    position: relative;
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-50);
    overflow: hidden;
}

.section-background {
    position: absolute;
    top: -10%;
    left: -10%;
    width: 120%;
    height: 120%;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    opacity: 0.2;
    z-index: 0;
    will-change: transform;
    filter: grayscale(30%) blur(0.5px);
    transition: none;
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.services .section-background::after,
.about .section-background::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        180deg,
        var(--color-gray-50) 0%,
        transparent 20%,
        transparent 80%,
        var(--color-gray-50) 100%
    );
    pointer-events: none;
}

.about .section-background::after {
    background: linear-gradient(
        180deg,
        var(--color-white) 0%,
        transparent 20%,
        transparent 80%,
        var(--color-white) 100%
    );
}

.services .container {
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.contact .section-header {
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    color: var(--color-text-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.service-card {
    background-color: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-gray-200);
    transition: var(--transition);
    will-change: transform;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-image {
    position: relative;
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.service-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
    will-change: transform;
}

.service-card:hover .service-image img {
    transform: scale(1.1);
}

.service-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(0, 0, 0, 0.3) 100%
    );
}

.service-content {
    padding: var(--spacing-md);
}

.service-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.service-text {
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ========================================
   About Section
   ======================================== */
.about {
    position: relative;
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
    overflow: hidden;
}

.about .container {
    position: relative;
    z-index: 1;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.info-item {
    padding: var(--spacing-md);
    background-color: var(--color-gray-50);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-200);
}

.info-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 1.125rem;
    color: var(--color-text);
    font-weight: 500;
}

.info-value a {
    color: var(--color-accent);
}

.info-value a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-50);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-message {
    margin-bottom: var(--spacing-md);
    text-align: center;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 var(--spacing-md);
}

.contact-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text);
    margin: 0;
    text-align: center;
    word-break: normal;
    overflow-wrap: break-word;
    line-break: auto;
}

.contact-info {
    text-align: center;
}

.contact-item {
    padding: var(--spacing-md);
    background-color: var(--color-white);
    border-radius: 8px;
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-sm);
}

.contact-label {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.contact-value {
    font-size: 1.25rem;
    color: var(--color-accent);
}

.contact-value a {
    color: var(--color-accent);
    font-weight: 500;
}

.contact-value a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--color-gray-800);
    color: var(--color-gray-200);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.footer-logo img {
    height: 60px;
    width: auto;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--color-gray-400);
}

/* ========================================
   Parallax Effect
   ======================================== */
.parallax {
    will-change: transform;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        width: 100%;
        max-width: 300px;
        height: calc(100vh - 70px);
        background-color: var(--color-gray-800);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: var(--transition);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        width: 100%;
        padding: var(--spacing-sm) 0;
    }

    .hero {
        min-height: 500px;
        height: 100vh;
    }

    .hero-background {
        background-image: url('img/hero_mob.jpg');
        background-size: cover;
        background-position: center center;
    }

    .section-background {
        opacity: 0.15;
        filter: grayscale(40%) blur(1px);
    }

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

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .service-image {
        height: 250px;
    }

    .about-info {
        grid-template-columns: 1fr;
    }

    .contact-text {
        text-align: center;
        font-size: 1rem;
        word-break: normal;
        line-break: auto;
        overflow-wrap: anywhere;
    }

    .contact-message {
        max-width: 100%;
        padding: 0 var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .contact .section-header {
        margin-bottom: var(--spacing-md);
    }
}

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

    .hero-content {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .section-title {
        font-size: 1.75rem;
    }

    .service-title {
        font-size: 1.25rem;
    }

    .contact-text {
        font-size: 1rem;
        line-height: 1.8;
        text-align: center;
        word-break: normal;
        line-break: auto;
        overflow-wrap: anywhere;
    }

    .contact-message {
        max-width: 100%;
        padding: 0 var(--spacing-sm);
        margin-bottom: var(--spacing-md);
    }

    .contact .section-header {
        margin-bottom: var(--spacing-md);
    }
}

/* ========================================
   Smooth Scrolling Enhancements
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}