模板:收缩大标题/styles.css

/* ============================================
   收缩大标题
   标题栏固定，面板向下展开
   ============================================ */

.fold {
    display: block;
    position: relative;
    margin: 1em 0;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    user-select: none;
    -webkit-user-select: none;
}

/* ---- 标题栏（可点击） ---- */
.fold__bar {
    display: block;
    position: relative;
    padding: 1.2em 3.5em 1.2em 1.5em;
    color: #fff;
    cursor: pointer;
    transition: filter 0.3s ease;
}
.fold__bar:hover {
    filter: brightness(1.15);
}

/* ---- 背景水印 ---- */
.fold__watermark {
    display: block;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 5em;
    font-weight: 900;
    line-height: 1;
    opacity: 0.15;
    pointer-events: none;
    z-index: 0;
}

/* ---- 标题组 ---- */
.fold__titles {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    line-height: 1.2;
    position: relative;
    z-index: 1;
}
.fold__title-cn {
    display: block;
    font-size: 2.5em;
    font-weight: 900;
    letter-spacing: 0.02em;
}
.fold__title-en {
    display: block;
    font-size: 1em;
    font-weight: bold;
    letter-spacing: 0.35em;
}
.fold__title-deco {
    display: block;
    font-size: 0.8em;
    font-weight: bold;
    letter-spacing: 0.25em;
}

/* ---- 展开符号 ---- */
.fold__icon {
    display: block;
    position: absolute;
    right: 1.2em;
    top: 50%;
    transform: translateY(-50%);
    width: 1.5em;
    height: 1.5em;
    line-height: 1.5em;
    text-align: center;
    font-size: 1.5em;
    font-weight: bold;
    color: #fff;
    z-index: 2;
    transition: transform 0.3s ease;
}
.fold.is-open .fold__icon {
    transform: translateY(-50%) rotate(45deg);
}

/* ---- 内容面板：向下展开 ---- */
.fold__panel {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.4s ease;
}
.fold.is-open .fold__panel {
    grid-template-rows: 1fr;
}
.fold__panel-inner {
    display: block;
    overflow: hidden;
    padding: 0 1.5em;
    color: #333;
    line-height: 1.6;
    transition: padding 0.4s ease;
}
.fold.is-open .fold__panel-inner {
    padding: 1.2em 1.5em;
}