:root {
    --color-primary: #1a365d;
    --color-accent: #2b6cb0;
    --color-bg: #f8fafc;
    --color-text: #1a202c; /* Darkened from 2d3748 */
    --color-border: #e2e8f0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
/* モーダル（iframe）内表示用: レイアウト崩れ防止 */
body.is-embed {
    overflow-x: hidden;
    min-width: 0;
}
body.is-embed .header { padding: 12px 0; }
body.is-embed .header__inner {
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    padding: 0 4%;
}
body.is-embed .nav ul {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 16px;
}
body.is-embed .nav a { font-size: 0.8rem; }
body.is-embed .nav a.cta { padding: 10px 20px; }
body.is-embed .hero {
    height: auto;
    min-height: 50vh;
    padding: 140px 0 40px; /* 100px -> 140px に増量 */
}
body.is-embed .hero__title { font-size: clamp(1.5rem, 5vw, 2.5rem); margin-bottom: 16px; }
body.is-embed .hero__desc { font-size: 0.95rem; margin-bottom: 24px; }
body.is-embed .btn { padding: 12px 24px; font-size: 0.85rem; margin: 4px; }
body.is-embed .section { padding: 40px 0; }
body.is-embed .section-title { margin-bottom: 28px; }
body.is-embed .section-title h2 { font-size: 1.35rem; }
body.is-embed .features__grid {
    grid-template-columns: 1fr;
    gap: 20px;
}
body.is-embed .feature { padding: 28px 20px; }
body.is-embed .feature h3 { font-size: 1.1rem; margin-bottom: 12px; }
body.is-embed .feature p { font-size: 0.9rem; }
body.is-embed .footer { padding: 40px 0 28px; }
body.is-embed .footer__grid {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
    margin-bottom: 28px;
}
body.is-embed .footer__nav ul { flex-wrap: wrap; justify-content: center; gap: 12px; }
body.is-embed .container { padding: 0 4%; max-width: 100%; }
body.is-embed .form-card { padding: 24px 20px; margin-top: 20px; }
body.is-embed .form-row { grid-template-columns: 1fr; margin-bottom: 0; }
body.is-embed .form-title { margin-bottom: 20px; }
body.is-embed .form-title h2 { font-size: 1.25rem; }
body.is-embed .form-group { margin-bottom: 16px; }
body.is-embed .form-group input,
body.is-embed .form-group select,
body.is-embed .form-group textarea { padding: 10px 12px; font-size: 16px; }
body.is-embed .btn-submit { padding: 14px; font-size: 0.95rem; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 5%; }
.u-mono { font-family: 'Courier New', Courier, monospace; }

/* Header */
.header {
    padding: 25px 0; background: #fff; position: sticky; top: 0; z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.header__inner { max-width: 1400px; margin: 0 auto; padding: 0 5%; display: flex; justify-content: space-between; align-items: center; }
.logo { font-weight: 900; font-size: 1.5rem; color: var(--color-primary); text-decoration: none; letter-spacing: -0.02em; }
.logo span { font-weight: 300; color: #718096; }

.nav ul { display: flex; list-style: none; gap: 40px; align-items: center; }
.nav a { text-decoration: none; color: #2d3748; font-size: 0.95rem; font-weight: 600; transition: color 0.2s; opacity: 0.8; }
.nav a:hover, .nav a.is-active { color: var(--color-accent); opacity: 1; }
.nav a.cta { background: var(--color-primary); color: #fff; padding: 14px 32px; border-radius: 4px; transition: background 0.3s; opacity: 1; }
.nav a.cta:hover { background: var(--color-accent); }

/* Hero */
.hero {
    height: 80vh; position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden; background: #000;
    padding-top: 80px; /* ヘッダー分のパディングを追加 */
}
.hero__image-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0.5; } /* Increased opacity */
.hero__image-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero__inner { position: relative; z-index: 10; text-align: center; color: #fff; max-width: 900px; padding: 0 5%; }

.badge { display: inline-block; background: var(--color-accent); color: #fff; padding: 8px 20px; border-radius: 4px; font-size: 0.8rem; font-weight: 700; margin-bottom: 30px; letter-spacing: 0.1em; }
.hero__title { font-size: clamp(2.5rem, 6vw, 4rem); font-weight: 800; margin-bottom: 30px; line-height: 1.2; }
.hero__desc { font-size: 1.2rem; opacity: 1; margin-bottom: 50px; text-shadow: 0 2px 10px rgba(0,0,0,0.3); } /* Increased opacity and shadow */

.btn { display: inline-block; padding: 18px 40px; border-radius: 4px; text-decoration: none; font-weight: 700; margin: 0 10px; transition: all 0.3s; }
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--secondary { background: rgba(255,255,255,0.1); color: #fff; backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.3); }
.btn:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); }

/* Section */
.section { padding: 140px 0; }
.section-title { text-align: center; margin-bottom: 80px; }
.section-title span { color: var(--color-accent); font-weight: 700; font-size: 0.9rem; letter-spacing: 0.2em; display: block; margin-bottom: 15px; }
.section-title h2 { font-size: 2.5rem; color: var(--color-primary); font-weight: 800; }

.features__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.feature { background: #fff; padding: 60px 40px; border-radius: 8px; box-shadow: 0 20px 40px rgba(0,0,0,0.03); border: 1px solid var(--color-border); transition: all 0.4s; }
.feature:hover { border-color: var(--color-accent); transform: translateY(-10px); box-shadow: 0 30px 60px rgba(0,0,0,0.08); }
.feature__icon { font-size: 0.9rem; color: var(--color-accent); margin-bottom: 30px; font-weight: 900; background: var(--color-bg); width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; border-radius: 50%; }
.feature h3 { font-size: 1.5rem; margin-bottom: 20px; color: var(--color-primary); }
.feature p { font-size: 1rem; color: #4a5568; } /* Darkened text */

/* Footer */
.footer { padding: 100px 0 50px; background: #fff; border-top: 1px solid var(--color-border); }
.footer__grid { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 60px; }
.footer__brand p { margin-top: 20px; color: #4a5568; }
.footer__nav ul { list-style: none; display: flex; gap: 30px; }
.footer__nav a { text-decoration: none; color: #2d3748; font-weight: 600; font-size: 0.9rem; }
.footer__copy { padding-top: 40px; border-top: 1px solid var(--color-border); text-align: center; color: #718096; font-size: 0.9rem; }

@media (max-width: 1024px) {
    .features__grid { grid-template-columns: 1fr; gap: 32px; }
    .footer__grid { flex-direction: column; gap: 40px; align-items: center; text-align: center; }
    .footer__nav ul { justify-content: center; }
}

/* Page: Contact */
.form-card { background: #fff; padding: 60px; border-radius: 12px; box-shadow: 0 30px 60px rgba(0,0,0,0.05); border: 1px solid var(--color-border); margin-top: -100px; position: relative; z-index: 20; }
.form-title { margin-bottom: 40px; text-align: center; }
.form-title h2 { font-size: 2rem; color: var(--color-primary); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; margin-bottom: 30px; }
.form-group { margin-bottom: 30px; }
.form-group label { display: block; font-weight: 700; margin-bottom: 10px; color: var(--color-primary); font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 15px; border: 1px solid var(--color-border); border-radius: 6px; font-size: 1rem; background: #f8fafc; outline: none; transition: border-color 0.3s; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--color-accent); background: #fff; }

.btn-submit { width: 100%; background: var(--color-primary); color: #fff; border: none; padding: 20px; border-radius: 6px; font-weight: 700; font-size: 1.1rem; cursor: pointer; transition: all 0.3s; }
.btn-submit:hover { background: var(--color-accent); transform: translateY(-2px); box-shadow: 0 10px 20px rgba(43, 108, 176, 0.2); }

/* Mobile: 768px and below */
@media (max-width: 768px) {
    .header { padding: 16px 0; }
    .header__inner {
        flex-direction: column;
        gap: 16px;
        align-items: center;
        text-align: center;
    }
    .logo { font-size: 1.25rem; }
    .nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px 20px;
    }
    .nav a { font-size: 0.85rem; }
    .nav a.cta { padding: 12px 24px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
    .hero { height: auto; min-height: 70vh; padding: 60px 0; }
    .hero__inner { padding: 0 5%; }
    .badge { font-size: 0.7rem; padding: 6px 16px; margin-bottom: 20px; }
    .hero__title { font-size: clamp(1.75rem, 6vw, 3rem); margin-bottom: 20px; }
    .hero__desc { font-size: 1rem; margin-bottom: 32px; }
    .btn { padding: 14px 28px; font-size: 0.9rem; margin: 4px 6px; }
    .section { padding: 80px 0; }
    .section-title { margin-bottom: 48px; }
    .section-title h2 { font-size: 1.75rem; }
    .features__grid { gap: 24px; }
    .feature { padding: 40px 24px; }
    .feature h3 { font-size: 1.25rem; margin-bottom: 16px; }
    .feature p { font-size: 0.95rem; }
    .footer { padding: 60px 0 40px; }
    .footer__grid {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 32px;
        margin-bottom: 40px;
    }
    .footer__nav ul { flex-wrap: wrap; justify-content: center; gap: 16px; }
    .form-row { grid-template-columns: 1fr; gap: 0; margin-bottom: 0; }
    .form-card { padding: 24px 20px; margin-top: 20px; }
    .form-title { margin-bottom: 28px; }
    .form-title h2 { font-size: 1.5rem; }
    .form-group { margin-bottom: 20px; }
    .form-group input, .form-group select, .form-group textarea { padding: 12px; font-size: 16px; }
    .btn-submit { padding: 16px; font-size: 1rem; }
}