/* 宣传轮播区域样式 */
.poster-carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
    /* 留出导航栏的空间 */
    margin-top: 90px;
}

/* 预留宣传图比例，图片加载前就占据对应高度，避免页面抖动（CLS） */
.carousel-track {
    position: relative;
    width: 100%;
    aspect-ratio: 1910 / 747;
}

.carousel-slide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    /* contain：完整展示整张横幅，不放大不裁剪，避免两侧裁掉内容 */
    object-fit: contain;
    display: block;
    opacity: 0;
    transition: opacity 0.8s ease;
}

/* 激活的图片显示 */
.carousel-slide.active {
    opacity: 1;
}

/* 左右切换箭头 */
.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.8);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    color: #374151;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.carousel-arrow:hover {
    background: var(--white);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    color: var(--secondary-color);
}

.carousel-arrow.prev {
    left: 2rem;
}

.carousel-arrow.next {
    right: 2rem;
}

.carousel-dots {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.75rem;
    z-index: 10;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: background 0.3s ease;
}

.dot.active {
    background: var(--white);
}

.dot:hover {
    background: var(--white);
}

/* 响应式：仅调整内边距与控件尺寸，不改变宣传图比例，避免移动端裁剪/放大 */
@media (max-width: 768px) {
    .poster-carousel {
        margin-top: 72px;
    }

    .carousel-arrow {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }

    .carousel-arrow.prev {
        left: 0.5rem;
    }

    .carousel-arrow.next {
        right: 0.5rem;
    }

    .carousel-dots {
        bottom: 0.8rem;
        gap: 0.5rem;
    }

    .dot {
        width: 8px;
        height: 8px;
    }
}

@media (max-width: 576px) {
    .poster-carousel {
        margin-top: 64px;
    }

    .carousel-arrow {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .carousel-arrow.prev {
        left: 0.4rem;
    }

    .carousel-arrow.next {
        right: 0.4rem;
    }
}

@media (max-width: 480px) {
    .poster-carousel {
        margin-top: 60px;
    }

    .carousel-arrow {
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
    }

    .carousel-arrow.prev {
        left: 0.3rem;
    }

    .carousel-arrow.next {
        right: 0.3rem;
    }

    .carousel-dots {
        bottom: 0.5rem;
        gap: 0.4rem;
    }

    .dot {
        width: 6px;
        height: 6px;
    }
}