/* =========================================
   Base Styles & Variables
========================================= */
:root {
    --color-bg: #0d0d0d;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-accent: #ff4a4a;
    --font-en: 'Montserrat', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-jp);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, .logo {
    font-family: var(--font-en);
}

a {
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.3s ease;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 120px 0;
}

/* =========================================
   Header
========================================= */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 100%);
    backdrop-filter: blur(5px);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-menu a:hover {
    color: var(--color-accent);
}

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

.hero-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at center, #2a2a2a 0%, #0d0d0d 70%);
    z-index: -1;
    /* ここに薄く動画や画像を敷くとより良くなります */
    /* background-image: url('your-video-placeholder.jpg'); background-size: cover; opacity: 0.3; */
}

.hero-content {
    text-align: center;
    z-index: 1;
}

.hero-content h1 {
    font-size: 5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: 5px;
}

.hero-content .subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}

.btn-primary {
    display: inline-block;
    padding: 15px 40px;
    background-color: var(--color-accent);
    color: #fff;
    border-radius: 30px;
    font-weight: 700;
    letter-spacing: 1px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(255, 74, 74, 0.3);
    color: #fff;
}

.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    letter-spacing: 2px;
    font-family: var(--font-en);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
    40% { transform: translateY(-10px) translateX(-50%); }
    60% { transform: translateY(-5px) translateX(-50%); }
}

/* =========================================
   Sections (Services, Company)
========================================= */
.section-title {
    font-size: 2.5rem;
    margin-bottom: 60px;
    display: flex;
    flex-direction: column;
}

.section-title span {
    font-size: 0.9rem;
    font-family: var(--font-jp);
    color: var(--color-text-muted);
    margin-top: 5px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-card {
    background: #1a1a1a;
    padding: 40px 30px;
    border-radius: 10px;
    transition: transform 0.3s ease, background 0.3s ease;
    border: 1px solid #333;
}

.service-card:hover {
    transform: translateY(-10px);
    background: #222;
    border-color: var(--color-accent);
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #fff;
}

.service-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* Company */
.company-info dl {
    display: flex;
    flex-wrap: wrap;
    border-top: 1px solid #333;
}

.company-info dt, .company-info dd {
    padding: 20px;
    border-bottom: 1px solid #333;
}

.company-info dt {
    width: 30%;
    font-weight: 700;
    color: var(--color-text-muted);
}

.company-info dd {
    width: 70%;
}

/* =========================================
   Footer
========================================= */
.footer {
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid #1a1a1a;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.copyright {
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

/* =========================================
   Animations (Triggered by JS)
========================================= */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease-out;
}

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

/* =========================================
   Responsive
========================================= */
@media (max-width: 768px) {
    .hero-content h1 { font-size: 3rem; }
    .hero-content .subtitle { font-size: 1rem; }
    .company-info dt, .company-info dd { width: 100%; padding: 15px 0; }
    .company-info dt { border-bottom: none; padding-bottom: 0; }
}