/* introduction-section.css — 介紹區塊（IntroductionSection）
   重點：任何尺寸／任何比例的圖片都能顯示
     ① 版面：--intro-fit: contain（預設）⇒ 完整顯示、保持原有比例、不扭曲、不裁切；cover ⇒ 填滿外框再裁切
        --intro-ratio 有值才開啟固定比例框（例 '1/1' 重現舊版正方形），無值則依圖片本身比例
     ② max-width/max-height 限制 ⇒ 大圖縮放至框內、小圖維持原尺寸（不會被強行放大而失真）
   全部規則前綴 .introduction-section / .intro-sec / .intro-zoom */

.introduction-section {
    --intro-accent: var(--secondary-color, #ed8323);
    --intro-r: 12px;
    --intro-ink: #212121;
    --intro-muted: #6b6b6b;
    font-family: -apple-system, "Microsoft JhengHei", "PingFang TC", Arial, sans-serif;
    color: var(--intro-ink);
    font-size: 14px;
    line-height: 1.75;
    margin: 24px 0;
}

.introduction-section * {
    box-sizing: border-box;
}

.intro-sec {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 24px;
}

.introduction-section--reverse .intro-sec {
    flex-direction: row-reverse;
}

/* ---------- 圖（任何尺寸）---------- */
.intro-sec__media {
    flex: 1 1 30%;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--intro-r);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    background: #f5f5f5;
    max-height: var(--intro-max-h, 500px);
    min-height: var(--intro-min-h, 0);
    overflow: hidden;
}

.intro-sec__zoom {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    text-decoration: none;
    cursor: zoom-in;
}

.intro-sec__img {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: var(--intro-max-h, 500px);
    object-fit: var(--intro-fit, contain);
    border-radius: var(--intro-r);   /* 同外框一致（外框有 overflow:hidden，雙重保險） */
    object-position: center;
}

/* 有指定比例（例 '1/1'）＝ 固定比例框：圖填滿框（配 cover 就裁邊、配 contain 就留白）*/
.intro-sec__media--ratio {
    aspect-ratio: var(--intro-ratio);
}

.intro-sec__media--ratio .intro-sec__img {
    width: 100%;
    height: 100%;
    max-height: none;
}

.intro-sec__hint {
    position: absolute;
    right: 8px;
    bottom: 8px;
    padding: 3px 8px;
    border-radius: var(--intro-r);
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    font-size: 11.5px;
    line-height: 1.6;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.18s ease;
}

.intro-sec__zoom:hover .intro-sec__hint,
.intro-sec__zoom:focus .intro-sec__hint {
    opacity: 1;
}

/* ---------- 文字 ---------- */
.intro-sec__body {
    flex: 2 1 60%;
    min-width: 0;
    padding: 8px 24px;
}

.intro-sec__title {
    margin: 0 0 10px;
    font-size: 24px;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: 3px;
}

.intro-sec__text {
    margin: 0;
    font-size: 15px;
    color: var(--intro-muted);
    white-space: pre-line;
}

.intro-sec__action {
    margin-top: 18px;
}

.intro-sec__btn {
    display: inline-block;
    min-width: 180px;
    height: 48px;
    padding: 6px 24px;
    border: 1px solid var(--intro-accent);
    border-radius: var(--intro-r);
    background: var(--intro-accent);
    color: #fff;
    font-size: 15px;
    font-weight: 700;
    line-height: 34px;
    letter-spacing: 1px;
    text-align: center;
    text-decoration: none;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.intro-sec__btn:hover {
    color: #fff;
    text-decoration: none;
    transform: translateY(-3px);
    box-shadow: 0 12px 24px -6px rgba(0, 0, 0, 0.25);
}

/* ---------- Lightbox（查看原圖；大圖縮放至畫面內、小圖維持原始尺寸）---------- */
.intro-zoom {
    --intro-r: 12px;   /* lightbox 喺 .introduction-section 之外，呢度要再宣告一次（同 --intro-r 一致） */
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--intro-zoom-bg, rgba(0, 0, 0, 0.88));
}

.intro-zoom[hidden] {
    display: none;
}

.intro-zoom__fig {
    margin: 0;
    max-width: 94vw;
    max-height: 90vh;
    text-align: center;
}

.intro-zoom__img {
    display: block;
    width: auto;
    height: auto;
    max-width: 94vw;
    max-height: 84vh;
    margin: 0 auto;
    border-radius: var(--intro-r);
    background: #fff;
    object-fit: contain;
}

.intro-zoom__cap {
    margin-top: 10px;
    color: #f0f0f0;
    font-size: 13px;
}

.intro-zoom__close {
    position: absolute;
    top: 12px;
    right: 16px;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 0;
    border-radius: var(--intro-r);
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    font-size: 26px;
    line-height: 42px;
    cursor: pointer;
}

.intro-zoom__close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ---------- RWD ---------- */
@media (max-width: 768px) {
    .intro-sec > * {
        flex-basis: 100%;
    }

    .introduction-section--reverse .intro-sec {
        flex-direction: column;
    }

    .intro-sec__media {
        max-height: 320px;
    }

    .intro-sec__img {
        max-height: 320px;
    }

    .intro-sec__body {
        padding: 4px 4px;
    }

    .intro-sec__title {
        font-size: 20px;
        letter-spacing: 1px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .intro-sec__btn,
    .intro-sec__hint {
        transition: none;
    }

    .intro-sec__btn:hover {
        transform: none;
    }
}