/* ========================================
   開発背景ページ（dentis vision風）
   ======================================== */

.bg-container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   ヒーロー（単色背景 + リード文）
   ======================================== */
.bg-hero {
    background: #00BCD4;
    padding: 72px 24px 80px;
    text-align: center;
}

.bg-hero-title {
    font-size: clamp(28px, 2.5vw + 16px, 40px);
    font-weight: 800;
    color: #fff;
    letter-spacing: 0.04em;
    margin-bottom: 20px;
}

.bg-hero-lead {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.9);
    line-height: 2.0;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   セクション共通
   ======================================== */
.bg-section {
    padding: 80px 0;
}

.bg-section-alt {
    background: #f5f7fa;
}

/* セクションラベル（VISION, MISSION等） */
.bg-label {
    font-size: 15px;
    font-weight: 700;
    color: #00BCD4;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

/* セクション見出し */
.bg-heading {
    font-size: clamp(20px, 1.5vw + 12px, 26px);
    font-weight: 700;
    color: #222;
    line-height: 1.7;
    margin-bottom: 36px;
}

/* セクション本文 */
.bg-text {
    font-size: 15px;
    color: #555;
    line-height: 2.1;
    margin-bottom: 20px;
}

.bg-text:last-child {
    margin-bottom: 0;
}

/* ========================================
   VISION セクション
   ======================================== */
.bg-vision-body {
    max-width: 720px;
}

/* ========================================
   画像プレースホルダー
   ======================================== */
.bg-image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 7;
    background: #e8e8e8;
    border-radius: 12px;
    object-fit: cover;
    display: block;
    margin-top: 20px;
}

/* ========================================
   MISSION 2カラム
   ======================================== */
.bg-mission-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 8px;
}

.bg-mission-card {
    background: #fff;
    border: 1px solid #e0e6ed;
    border-radius: 12px;
    padding: 32px 28px;
}

.bg-mission-card-icon {
    font-size: 28px;
    color: #00BCD4;
    margin-bottom: 12px;
}

.bg-mission-card-title {
    font-size: 17px;
    font-weight: 700;
    color: #333;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid #00BCD4;
}

.bg-mission-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bg-mission-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 14px;
    color: #555;
    line-height: 1.7;
    padding: 8px 0;
}

.bg-mission-list li i {
    color: #00BCD4;
    margin-top: 3px;
    flex-shrink: 0;
}

/* ========================================
   開発ストーリー
   ======================================== */
.bg-story-block {
    margin-bottom: 48px;
}

.bg-story-block:last-child {
    margin-bottom: 0;
}

.bg-story-subtitle {
    font-size: 17px;
    font-weight: 700;
    color: #333;
    margin-bottom: 16px;
    padding-left: 14px;
    border-left: 4px solid #00BCD4;
}

.bg-story-text {
    font-size: 15px;
    color: #555;
    line-height: 2.1;
}

/* ========================================
   CTA
   ======================================== */
.bg-cta {
    padding: 64px 0;
    text-align: center;
}

.bg-cta-text {
    font-size: 16px;
    color: #555;
    margin-bottom: 24px;
}

.bg-cta-btn {
    display: inline-block;
    padding: 16px 60px;
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    background: #00BCD4;
    border-radius: 50px;
    text-decoration: none;
    transition: background 0.3s, transform 0.2s;
}

.bg-cta-btn:hover {
    background: #00838f;
    transform: translateY(-2px);
}

/* ========================================
   レスポンシブ
   ======================================== */
@media (max-width: 768px) {
    .bg-hero {
        padding: 56px 20px 64px;
    }

    .bg-section {
        padding: 56px 0;
    }

    .bg-mission-grid {
        grid-template-columns: 1fr;
    }

    .bg-mission-card {
        padding: 24px 20px;
    }

    .bg-cta-btn {
        width: 100%;
        padding: 16px;
    }
}