/* Variables */
:root {
    --color-primary: #111111;
    --color-primary-hover: #333333;
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    --color-text: #1f2937;
    --color-text-light: #4b5563;
    --color-border: #e5e7eb;
    
    --font-sans: 'Inter', 'Noto Sans JP', sans-serif;
    
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

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

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

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    line-height: 1.3;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 8px;
}

.section-subtitle {
    color: var(--color-text-light);
    margin-bottom: 48px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: 1px solid var(--color-primary);
}

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

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-border);
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid transparent;
    z-index: 100;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-light);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-primary);
}

/* Hero Section */
.hero {
    padding-top: 160px;
    padding-bottom: 100px;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 40px;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #f3f4f6 0%, #e5e7eb 100%);
    border-radius: var(--border-radius);
}

/* Service Section */
.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.service-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 32px;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.service-card-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.service-card-text {
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.service-link {
    font-weight: 500;
    color: var(--color-primary);
}

.service-link:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 60px 0 30px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    margin-bottom: 60px;
}

.footer-logo {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.footer-desc {
    color: var(--color-text-light);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--color-text-light);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease forwards;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes fadeIn {
    to { opacity: 1; }
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .service-grid {
        grid-template-columns: 1fr;
    }
    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }
    .nav {
        display: none; /* simple mobile nav hide for now */
    }
}