/* ==========================================
   ABOUT US ページ専用スタイリング
========================================== */

/* 💡 ページ全体のスムーススクロール */
html {
    scroll-behavior: smooth !important;
}
.about-page {
    background-color: #fff !important;
    margin-top: 80px !important;
    display: block;
    overflow: hidden;
}

/* 1つ目の導入画面（HERO） */
.about-hero {
    min-height: calc(100vh - 80px);
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
    padding: 120px 0;
    text-align: center !important;
    position: relative;
    background-color: #1a1a1a; /* 💡 灰色を隠すためにこの1行を追加 */
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0.1), rgba(0, 0, 0, 0.4));
    z-index: 1;
}
.hero-container-inner {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}
.section-tag-hero {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 25px;
    color: #e6c687;
}
.about-main-copy-hero {
    font-size: clamp(38px, 5.5vw, 60px) !important;
    font-weight: 700;
    line-height: 1.4 !important;
    letter-spacing: 0.08em;
    color: #ffffff !important;
    margin-bottom: 40px !important;
    text-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}
.about-main-copy-hero .sub-copy-hero {
    display: block;
    font-size: clamp(18px, 2.2vw, 24px);
    font-weight: 400;
    color: #dbdbdb;
    margin-top: 15px;
    letter-spacing: 0.12em;
}
.about-lead-text-hero {
    font-size: clamp(15px, 1.6vw, 18px) !important;
    color: #ffffff !important;
    line-height: 2.2 !important;
    max-width: 900px;
    margin: 0 auto;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.6);
}

/* 2つ目・3つ目のセクション（左右スプリットレイアウト共通設定） */
.about-split-row {
    position: relative;
    background-color: #fcfbf9;
    padding: 160px 0;
    display: flex;
    align-items: center;
    width: 100%;
}
.split-image-container {
    width: 62%;
    height: 75vh;
    min-height: 550px;
    overflow: hidden;
}
.split-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 白いはみ出しカードの絶対配置 */
.about-split-row .split-content-card {
    position: absolute;
    right: 6%;
    top: 50%;
    transform: translateY(-50%);
    width: 46%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 70px 60px;
    box-shadow: 0 40px 80px rgba(13, 27, 42, 0.05);
    z-index: 2;
}

/* 反転レイアウト（THE CHALLENGESセクションに適用） */
.about-split-row.invert-row {
    flex-direction: row-reverse;
}
.about-split-row.invert-row .challenge-content-card {
    position: absolute;
    left: 6%;
    top: 50%;
    transform: translateY(-50%);
    width: 46%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 70px 60px;
    box-shadow: 0 40px 80px rgba(13, 27, 42, 0.05);
    z-index: 2;
}

/* カード内の共通テキストデザイン */
.card-inner .en-tag {
    display: block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: #999;
    margin-bottom: 12px;
    text-transform: uppercase;
}
.card-inner .sub-title-gray {
    display: block;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: #999;
    margin-bottom: 12px;
    text-transform: uppercase;
}
.card-inner .card-en-title {
    font-size: clamp(32px, 4vw, 46px) !important;
    font-weight: 500;
    color: #bfa15f;
    margin: 0 0 20px 0 !important;
    line-height: 1.2;
    letter-spacing: 0.02em;
}
.card-inner .card-en-title-gold {
    font-size: clamp(32px, 4vw, 46px) !important;
    font-weight: 500;
    color: #bfa15f;
    margin: 0 0 20px 0 !important;
    line-height: 1.2;
    letter-spacing: 0.02em;
}
.card-inner .card-ja-title {
    font-size: clamp(20px, 2.4vw, 26px) !important;
    font-weight: 700;
    line-height: 1.5;
    color: #1a1a1a;
    margin-bottom: 35px;
    letter-spacing: 0.03em;
}
.card-inner .card-ja-title-large {
    font-size: clamp(22px, 2.6vw, 30px) !important;
    font-weight: 700;
    line-height: 1.5;
    color: #1a1a1a;
    margin-bottom: 40px;
}
.card-inner .card-ja-text {
    font-size: clamp(14px, 1.3vw, 15px) !important;
    line-height: 2.1 !important;
    color: #444 !important;
    letter-spacing: 0.04em;
}
.card-inner .card-text-paragraphs p {
    font-size: clamp(14px, 1.3vw, 15px) !important;
    line-height: 2.1 !important;
    color: #444 !important;
    letter-spacing: 0.04em;
    margin-bottom: 20px;
}

/* 3つの課題箇条書きリストの調整 */
.challenge-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}
.challenge-sub-item {
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.challenge-sub-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.challenge-sub-item h5 {
    font-size: clamp(15px, 1.6vw, 17px) !important;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}
.challenge-sub-item p {
    font-size: 14px;
    line-height: 1.8;
    color: #555;
}

/* ==========================================
   社名の由来セクション
========================================== */
.about-name-origin {
    display: flex;
    width: 100%;
    min-height: 80vh;
}

/* 左側：ブランドカラーの背景に巨大な文字 */
.origin-left {
    width: 50%;
    /* 貴社のトーンに合わせた深いミッドナイトブルー（黒に近い青） */
    background-color: #bfa15f; 
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 50px;
}
.origin-left .large-name {
    font-size: clamp(48px, 6vw, 90px);
    color: #ffffff;
    font-family: 'Helvetica Neue', Arial, sans-serif;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: 0.05em;
}

/* 右側：白背景に由来のテキスト */
.origin-right {
    width: 50%;
    background-color: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px 8%;
}
.origin-right .en-tag {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #888;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}
.origin-right .equation-title {
    font-size: clamp(32px, 4vw, 50px);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    font-weight: 500;
    color: #1a1a1a;
    margin-bottom: 40px;
    letter-spacing: 0.05em;
}
.origin-right .ja-catchphrase {
    font-size: clamp(18px, 2vw, 22px);
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 30px;
    line-height: 1.6;
}
.origin-right .origin-text p {
    font-size: 15px;
    line-height: 2.2;
    color: #444;
    margin-bottom: 20px;
    letter-spacing: 0.04em;
}

/* スマホ用のレスポンシブ（縦並び） */
@media screen and (max-width: 991px) {
    .about-name-origin {
        flex-direction: column;
    }
    .origin-left, .origin-right {
        width: 100%;
    }
    .origin-left {
        padding: 100px 40px;
        min-height: 40vh;
    }
    .origin-right {
        padding: 80px 30px;
    }
}

/* ==========================================
   スマートフォン対応（レスポンシブ設定）
========================================== */
@media screen and (max-width: 991px) {
    .about-split-row,
    .about-split-row.invert-row {
        flex-direction: column !important;
        padding: 80px 20px;
    }
    .split-image-container {
        width: 100%;
        height: 45vh;
        min-height: 350px;
    }
    .about-split-row .split-content-card,
    .about-split-row.invert-row .challenge-content-card {
        position: relative !important;
        top: 0 !important;
        left: 0 !important;
        transform: none !important;
        width: 100%;
        padding: 50px 30px;
        box-shadow: none;
        background: #fff;
    }
}

@media screen and (max-width: 768px) {
    .about-page {
        margin-top: 70px !important;
    }
    .about-hero {
        min-height: calc(100vh - 70px);
        padding: 80px 20px;
    }
}

/* ==========================================
   Contact セクション（About usページ下部）
========================================== */
.about-contact-section {
    position: relative;
    width: 100%;
    margin-top: 120px;
    padding: 120px 0;
    background-size: cover;
    background-position: center;
    background-attachment: fixed; /* 画像を固定し、スクロール時にパララックス効果を出す */
    display: flex;
    justify-content: center;
    align-items: center;
}

.contact-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* 画像のトーンを落とす、深いネイビーの透過レイヤー */
    background-color: rgba(17, 34, 51, 0.85);
    z-index: 1;
}

.contact-container {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 左側のテキスト群 */
.contact-left .contact-title {
    font-size: clamp(40px, 5vw, 60px);
    font-family: 'Helvetica Neue', Arial, serif;
    font-weight: 400;
    color: #ffffff;
    margin-bottom: 15px;
    letter-spacing: 0.05em;
}

.contact-left .contact-sub {
    font-size: 14px;
    color: #e0e0e0;
    letter-spacing: 0.05em;
}

/* 右側のボタンデザイン */
.contact-right {
    display: flex;
    align-items: center;
}

.contact-btn {
    display: flex;
    align-items: center;
    padding: 20px 40px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background-color: transparent;
    color: #ffffff;
    text-decoration: none;
    transition: all 0.3s ease;
}

.contact-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.8);
}

.contact-btn i.fa-envelope {
    font-size: 18px;
    margin-right: 20px;
    color: #ffffff;
}

.contact-btn .btn-divider {
    width: 1px;
    height: 24px;
    background-color: rgba(255, 255, 255, 0.3);
    margin-right: 20px;
}

.contact-btn .btn-text {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1em;
    margin-right: 40px;
}

.contact-btn i.fa-arrow-right-long {
    font-size: 14px;
}

/* ==========================================
   スマートフォン対応（レスポンシブ）
========================================== */
@media screen and (max-width: 768px) {
    .about-contact-section {
        padding: 80px 0;
    }
    .contact-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 50px;
        padding: 0 20px;
    }
    .contact-left .contact-title {
        margin-bottom: 10px;
    }
    .contact-right {
        width: 100%;
    }
    .contact-btn {
        width: 100%;
        justify-content: flex-start;
        padding: 18px 25px;
    }
    .contact-btn .btn-text {
        margin-right: auto; /* テキストと矢印の間隔を自動で広げて右端に寄せる */
    }
}