:root {
    --bg-color: #0d0d0d;
    --text-color: #ffffff;
    --accent-color: #00ffff;
    /* Cyan */
    --accent-secondary: #bf00ff;
    /* Purple */
    --card-bg: #1a1a1a;
    --font-main: 'Noto Sans JP', sans-serif;
    --font-english: 'Outfit', sans-serif;
    --header-height: 80px;
}

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

ul {
    list-style: none;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo img {
    height: 40px;
    width: auto;
}

.nav ul {
    display: flex;
    gap: 2rem;
}

.nav a {
    font-family: var(--font-english);
    font-weight: 500;
    font-size: 0.9rem;
    letter-spacing: 1px;
    position: relative;
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s;
}

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

.btn-contact {
    border: 1px solid var(--accent-color);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    color: var(--accent-color);
    transition: all 0.3s;
}

.btn-contact:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

/* Mobile Menu */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--text-color);
    transition: 0.3s;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(0, 255, 255, 0.1) 0%, rgba(13, 13, 13, 1) 70%);
    z-index: -1;
}

.hero-title {
    font-family: var(--font-english);
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: 2px;
}

.gradient-text {
    background: linear-gradient(45deg, var(--accent-color), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.8);
}

/* Sections */
.section {
    padding: 100px 5%;
    position: relative;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-english);
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    letter-spacing: 2px;
    position: relative;
}

.section-title::before {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-secondary));
}

/* Vision */
.vision-content {
    text-align: center;
    font-size: 1.2rem;
    line-height: 2;
}

/* Business Grid */
.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.business-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 255, 0.1);
    border-color: rgba(0, 255, 255, 0.3);
}

.business-card h3 {
    font-family: var(--font-english);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

/* Strengths */
.dark-bg {
    background: #000;
    /* Darker than main bg or slightly different tone */
}

.strength-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.strength-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent-secondary);
}

/* Products */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
}

.product-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.product-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
}

.product-desc {
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.8);
}

.store-links {
    display: flex;
    gap: 1rem;
}

.store-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    transition: background 0.3s;
}

.store-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Company */
.company-info {
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.info-row {
    display: flex;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.info-row dt {
    width: 30%;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.6);
}

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

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

/* Contact */
.contact-section {
    text-align: center;
}

.btn-primary {
    display: inline-block;
    margin-top: 2rem;
    padding: 1rem 3rem;
    background: linear-gradient(45deg, var(--accent-color), var(--accent-secondary));
    color: var(--bg-color);
    font-weight: 700;
    border-radius: 50px;
    font-size: 1.1rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

/* Footer */
.footer {
    padding: 2rem 5%;
    background: #000;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.copyright {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: 70%;
        height: calc(100vh - var(--header-height));
        background: rgba(13, 13, 13, 0.95);
        transition: right 0.3s;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav.active {
        right: 0;
    }

    .nav ul {
        flex-direction: column;
        align-items: center;
        gap: 3rem;
    }

    .hamburger {
        display: flex;
    }

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

    .pc-br {
        display: none;
    }

    .info-row {
        flex-direction: column;
        gap: 0.5rem;
    }

    .info-row dt {
        width: 100%;
    }

    .info-row dd {
        width: 100%;
    }
}