/* =========================================================
   poster-series.css
   风格化海报设计项目 — 三个系列差异化布局
   ========================================================= */

/* --- 系列通用 --- */
.poster-series {
    max-width: var(--max-width);
    margin: clamp(3rem, 6vw, 5rem) auto 0;
    padding: 0 clamp(1.25rem, 4vw, 3rem);
}

.poster-series:first-of-type {
    margin-top: clamp(2.5rem, 5vw, 4rem);
}

/* 系列标题区 */
.poster-series__header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: clamp(2rem, 4vw, 3rem);
    max-width: 48rem;
}

.poster-series__number {
    font-family: "Instrument Sans", sans-serif;
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 800;
    line-height: 1;
    flex-shrink: 0;
    -webkit-text-stroke: 1.5px rgba(0, 6, 9, 0.08);
    color: transparent;
}

.poster-series__title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 900;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: 0.6rem;
    color: var(--text);
}

.poster-series__desc {
    font-size: clamp(0.9rem, 1.3vw, 1rem);
    line-height: 1.8;
    color: var(--muted);
}

/* =========================================================
   系列 1：青岛地标建筑信息海报
   三列等宽网格
   ========================================================= */
.poster-series__grid--landmark {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(1rem, 2vw, 1.5rem);
}

.poster-card {
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 6px 24px rgba(0, 6, 9, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.poster-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px rgba(0, 6, 9, 0.1);
}

.poster-card img {
    width: 100%;
    height: auto;
    display: block;
}

/* 标注在卡片底部（hover 浮现） */
.poster-card figcaption,
.poster-cinema figcaption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.75rem 1.25rem;
    background: linear-gradient(transparent, rgba(0, 6, 9, 0.6));
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.poster-card:hover figcaption,
.poster-cinema:hover figcaption {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================================
   系列 2：四大名著双重曝光
   两列网格
   ========================================================= */
.poster-series__showcase {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(1rem, 2vw, 1.5rem);
}

.poster-cinema {
    border-radius: 16px;
    overflow: hidden;
    background: #000;
    box-shadow: 0 10px 40px rgba(0, 6, 9, 0.12);
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.poster-cinema:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 50px rgba(0, 6, 9, 0.16);
}

.poster-cinema img {
    width: 100%;
    height: auto;
    display: block;
}

/* =========================================================
   系列 3：韦斯安德森风格红楼梦
   四列等宽画廊，纯图片无文字
   ========================================================= */
.poster-series__gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: clamp(1rem, 2vw, 1.5rem);
}

.poster-portrait {
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 6px 24px rgba(0, 6, 9, 0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 3px solid rgba(0, 6, 9, 0.04);
}

.poster-portrait:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 6, 9, 0.12);
}

.poster-portrait img {
    width: 100%;
    height: auto;
    display: block;
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1024px) {
    .poster-series__grid--landmark {
        grid-template-columns: repeat(2, 1fr);
    }

    .poster-series__gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .poster-series__grid--landmark {
        grid-template-columns: 1fr;
    }

    .poster-series__showcase {
        grid-template-columns: 1fr;
    }

    .poster-series__gallery {
        grid-template-columns: repeat(2, 1fr);
    }

    .poster-series__header {
        flex-direction: column;
        gap: 0.75rem;
    }

    .poster-series__number {
        font-size: 3rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .poster-card,
    .poster-cinema,
    .poster-portrait {
        transition: none;
    }
}