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

body,
html {
    margin: 0;
    height: auto;
    width: 100%;
    overflow-x: hidden;
}

/* ====== visually-hidden ====== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ====== バナーセクション ====== */
.about-banner {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 40vh;
    background-color: #4cc313;
    position: relative;
    margin-top: 0;
    margin-bottom: 30px;
}

/* common.css の .banner-text を上書きするため .about-banner を親セレクタに追加 */
.about-banner .banner-text {
    position: absolute;
    left: 9%;
    top: 27%;
    transform: none;
    text-align: left;
    color: #fff;
}

.about-banner .banner-text .banner-en {
    font-size: 1.2rem;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    color: #4cc313;
    margin: 0;
}

.about-banner .banner-text .banner-ja {
    font-size: 2.5rem;
    font-family: "Zen Kaku Gothic New", system-ui, sans-serif;
    font-weight: 700;
    margin: 0;
    color: #fff;
}

@media (max-width: 768px) {
    .about-banner {
        background-size: cover;
        background-position: 60% center;
        height: 25vh;
        margin-bottom: 0;
    }

    .about-banner .banner-text {
        left: 4%;
        top: 20%;
    }

    .about-banner .banner-text .banner-ja {
        font-size: 1.5rem;
    }

    .about-banner .banner-text .banner-en {
        font-size: 1rem;
    }
}

/* ====== コンテナ ====== */
.about-container {
    width: 100%;
}

/* ====== コンテンツレイアウト ====== */
.content-section {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 0;
    margin: 0 auto;
    position: relative;
    width: 100%;
}

/* ====== ブランドコンセプト内 h3 見出し ====== */
.concept-heading {
    text-align: center;
    padding: 20px;
    margin: 20px auto;
    color: #4CC313;
    font-size: 1.5rem;
    letter-spacing: 0.1rem;
    font-family: 'Zen Kaku Gothic New', sans-serif;
    font-weight: 600;
}

.section-description {
    letter-spacing: 0.05rem;
    line-height: 1.75rem;
    font-size: 1rem;
    font-weight: 400;
    font-family: 'Noto Sans JP', sans-serif;
    color: #323232;
}

/* 左右の画像 */
.image-side {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
}

.image-side.left { align-items: flex-end; }
.image-side.right { align-items: flex-start; }

.image-side img {
    max-width: 100%;
    height: auto;
    margin-bottom: 40px;
}

/* 中央テキスト */
.text-side {
    flex: 2;
    text-align: center;
    margin: 0 40px;
    padding: 0 20px;
    max-width: 600px;
}

.text-side-catchcopy {
    text-align: center;
    font-size: 2rem;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 400;
    letter-spacing: 0.1rem;
    color: #323232;
}

/* ====== 効果セクション ====== */
.effective-section {
    padding: 50px 0;
    background-color: #eef6f2;
    position: relative;
}

.full-width-background {
    background-color: #eef6f2;
    width: 100vw;
    position: relative;
    left: 50%;
    margin-left: -50vw;
}

.effective-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.effect-images {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 25px 0;
}

.effect-image {
    text-align: center;
    margin: 0 40px;
}

.effect-image img {
    width: 400px;
    height: auto;
}

.highlight-image {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 20px 0;
}

.highlight-image img {
    width: 30%;
    height: auto;
}

.effect-description {
    font-size: 1rem;
    font-weight: 400;
    font-family: 'Noto Sans JP', sans-serif;
    color: #555;
    line-height: 1.8;
    width: 60%;
    text-align: center;
    margin: 20px auto;
    letter-spacing: 0.05rem;
}

/* ====== 開発ストーリーセクション ====== */
.development-section {
    text-align: center;
    padding: 50px 0;
}

.development-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.story-lead {
    text-align: center;
    font-size: 2rem;
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 400;
    letter-spacing: 0.1rem;
    color: #323232;
    margin-bottom: 20px;
}

.story-description {
    letter-spacing: 0.05rem;
    line-height: 1.75rem;
    font-size: 1rem;
    font-weight: 400;
    font-family: 'Noto Sans JP', sans-serif;
    color: #323232;
    margin-bottom: 20px;
}

.story-images {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 30px auto;
    padding: 0 20px;
}

.story-card {
    position: relative;
    width: 300px;
    overflow: hidden;
}

.story-card img {
    width: 100%;
    height: auto;
}

/* ====== モバイル ====== */
@media (max-width: 768px) {
    .pc { display: none; }

    /* ① h3見出しの折り返し修正 */
    .concept-heading {
        font-size: 1rem;
        letter-spacing: 0.05rem;
        padding: 10px;
        margin: 10px auto;
    }

    .content-section {
        flex-direction: column;
        align-items: center;
    }

    /* ① 左右の画像エリアは丸ごと非表示（空白除去） */
    .image-side { display: none; }

    .text-side {
        width: 100%;
        margin: 10px 0;
    }

    .text-side-catchcopy {
        font-size: 1.2rem;
    }

    .section-description {
        letter-spacing: 0.05rem;
        line-height: 1.5rem;
        font-size: 0.9rem;
        max-width: 280px;
        margin: 8px auto;
    }

    .brand-concept-sp1 {
        display: flex;
        justify-content: center;
        align-items: center;
    }

    .brand-concept-sp1 img {
        max-width: 50%;
        height: auto;
        display: block;
    }

    .brand-concept-sp2 {
        display: flex;
        flex-direction: row;
        justify-content: space-between;
    }

    .brand-concept-sp2 img {
        margin-top: 12%;
        width: 45%;
        height: auto;
        display: block;
    }

    /* ③ 効果セクションのタイトル折り返し修正 */
    .effective-section .main-title { font-size: 1.1rem; }

    /* ⑤ セクション余白を圧縮 */
    .effective-section { padding: 30px 0; }
    .development-section { padding: 30px 0; }

    .story-lead {
        font-size: 1.3rem;
        max-width: 260px;
        margin: 0 auto 16px;
    }

    .story-description {
        font-size: 0.875rem;
        line-height: 1.7;
        max-width: 280px;
        margin: 0 auto 16px;
    }

    .effect-description {
        font-size: 0.875rem;
        line-height: 1.7;
        max-width: 280px;
        margin: 0 auto 16px;
    }

    /* ④ ツボ・反射区の画像を横並び */
    .effect-images {
        flex-direction: row;
        align-items: flex-start;
        gap: 10px;
        padding: 0 10px;
    }

    .effect-image { margin: 0; }

    .effect-image img { width: 100%; }

    .effect-description { width: 90%; }

    .highlight-image img { width: 85%; }

    .story-images {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    .story-card { width: 80%; }

    .story-title-sp { font-size: 1.5rem; }

    .story-description { font-size: 0.9rem; }
}