body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #ffffff; /* 背景を白に固定 */
    color: #1d1d1f;
    line-height: 1.6;
}

/* ヘッダー */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    height: 48px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid #d2d2d7;
}

.nav-inner {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 20px;
}

.logo { font-weight: 600; font-size: 18px; }

.nav-links a {
    text-decoration: none;
    color: #1d1d1f;
    font-size: 12px;
    margin-left: 20px;
}

.btn-contact {
    background: #0071e3;
    color: #fff !important;
    padding: 4px 12px;
    border-radius: 12px;
}

/* ヒーローエリア */
.hero {
    padding-top: 150px;
    padding-bottom: 100px;
    text-align: center;
}

h1 { font-size: 56px; font-weight: 700; margin-bottom: 0; letter-spacing: -0.02em; }
.subtitle { font-size: 24px; color: #86868b; margin-top: 10px; }
.text-block { margin-top: 50px; font-size: 18px; color: #424245; }

/* カードレイアウト */
.features { padding: 80px 20px; background-color: #f5f5f7; }
.container { max-width: 900px; margin: 0 auto; }
.card-grid { display: flex; gap: 20px; }
.card {
    flex: 1;
    background: #fff;
    padding: 40px;
    border-radius: 20px;
}

/* アニメーション */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all 1s ease-out;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}