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

:root {
    --bg-color: #010002;
    --card-bg: #0f111a;
    --text-main: #e2e8f0;
    --text-dim: #94a3b8;
    --accent: #818cf8;
    --accent-gradient: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Inter', sans-serif;
}

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

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 4rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
    line-height: 1;
}

.logo-mark {
    width: 72px;
    height: auto;
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-en {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.logo-jp {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 4px;
    letter-spacing: 0.3em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: white;
}

/* Hero Section */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, #13122b 0%, #050507 80%);
    text-align: center;
    padding: 0 1rem;
}


.hero-sub {
    font-size: 0.8rem;
    letter-spacing: 0.4em;
    color: var(--accent);
    margin-bottom: 1.5rem;
    opacity: 0.8;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.accent-text {
    display: block;
    font-style: italic;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    max-width: 700px;
    margin: 0 auto 2.5rem;
    color: var(--text-dim);
    font-size: 1.1rem;
    font-weight: 300;
}

/* Buttons */
.btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    margin: 0 0.5rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.btn-secondary {
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Content Grid */
.container {
    max-width: 1100px;
    margin: 6rem auto;
    padding: 0 2rem;
}

.grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.card-title {
    color: var(--accent);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-bottom: 1rem;
    position: relative;
    padding-left: 1.5rem;
}

.feature-list li::before {
    content: "◆";
    position: absolute;
    left: 0;
    color: var(--accent);
}

.feature-label {
    color: var(--text-main);
    font-weight: 600;
    margin-right: 0.35rem;
    display: inline-block;
}

/* Footer */
.footer {
    text-align: center;
    padding: 4rem 1rem;
    color: #4b5563;
    font-size: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .grid { grid-template-columns: 1fr; }
    .navbar { padding: 1.5rem 2rem; }
    .nav-links { display: none; } /* ハンバ�Eガーメニューは省略 */
}