/**
 * ==========================================
 * 轮播组件样式 - Carousel Styles
 * ==========================================
 * 
 * 功能特性：
 * - 模块化设计，可独立使用
 * - 响应式布局，自动适配设备
 * - 完整的动画系统
 * - 支持多种配置
 * 
 * 版本：1.0.0
 * 作者：国王文化科技
 * 
 * ==========================================
 */

/* ========== 容器样式 ========== */
.carousel-container {
    position: relative;
    width: 100%;
    height: var(--carousel-height, 600px);
    overflow: hidden;
    background-color: var(--carousel-bg, var(--color-bg-tertiary));
}

.carousel-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
}

/* ========== 幻灯片样式 ========== */
.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: var(--carousel-transition, opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1));
    z-index: 1;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
    will-change: opacity, visibility;
}

.carousel-slide.active {
    opacity: 1;
    visibility: visible;
    z-index: 2;
}

.carousel-slide a {
    display: block;
    width: 100%;
    height: 100%;
    text-decoration: none;
    color: #fff;
}

/* ========== 图片样式 ========== */
.carousel-image {
    width: 100%;
    height: 100%;
    position: relative;
    background-color: var(--carousel-placeholder-bg, var(--color-bg-tertiary));
    overflow: hidden;
}

.carousel-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--carousel-zoom-duration, 12s cubic-bezier(0.4, 0, 0.2, 1));
    will-change: transform;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
}

.carousel-lazy {
    opacity: 0;
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity;
}

.carousel-lazy.carousel-loaded {
    opacity: 1;
}

.carousel-slide.active .carousel-image img {
    animation: carouselZoom 12s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes carouselZoom {
    0% {
        transform: scale(1) translateZ(0);
    }
    100% {
        transform: scale(var(--carousel-zoom-scale, 1.08)) translateZ(0);
    }
}

/* ========== 遮罩层样式 ========== */
.carousel-overlay,
.carousel-mask {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(0, 0, 0, var(--carousel-mask-dark, 0.75)) 0%,
        rgba(0, 0, 0, var(--carousel-mask-medium, 0.45)) 50%,
        rgba(0, 0, 0, var(--carousel-mask-light, 0.2)) 100%
    );
    z-index: 2;
}

/* ========== 内容区域样式 ========== */
.carousel-content {
    position: absolute;
    top: 50%;
    left: var(--carousel-content-left, 10%);
    transform: translateY(-50%) translateZ(0);
    z-index: 3;
    max-width: var(--carousel-content-max-width, 620px);
    opacity: 0;
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.1s, transform 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.1s;
    will-change: opacity, transform;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.carousel-slide.active .carousel-content {
    opacity: 1;
    transform: translateY(-50%) translateZ(0);
}

.carousel-content h3 {
    font-size: var(--carousel-title-size, 52px);
    font-weight: 700;
    margin-bottom: var(--carousel-title-spacing, 24px);
    color: #fff;
    letter-spacing: 0.02em;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.carousel-content strong {
    font-size: var(--carousel-subtitle-size, 24px);
    display: block;
    margin-bottom: var(--carousel-subtitle-spacing, 20px);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 500;
    letter-spacing: 0.03em;
}

.carousel-content p {
    font-size: var(--carousel-text-size, 16px);
    line-height: 1.8;
    margin-bottom: var(--carousel-text-spacing, 32px);
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    max-height: var(--carousel-text-max-height, 86px);
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: var(--carousel-text-lines, 3);
    -webkit-box-orient: vertical;
    letter-spacing: 0.01em;
}

.carousel-content button,
.carousel-content a.carousel-cta {
    display: inline-block;
    padding: var(--carousel-cta-padding, 14px 36px);
    background: var(--carousel-cta-bg, rgba(255, 255, 255, 0.15));
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--carousel-cta-radius, 30px);
    font-size: var(--carousel-cta-size, 15px);
    font-weight: 500;
    color: #fff;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    letter-spacing: 0.05em;
}

.carousel-content button:hover,
.carousel-content a.carousel-cta:hover {
    background: var(--carousel-cta-hover, rgba(255, 255, 255, 0.25));
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

/* ========== 导航按钮样式 ========== */
/*
 * 精确居中方案说明：
 * 使用三层结构实现分页指示点的精确居中：
 * 1. .carousel-navigation - 外层容器，使用 space-between 分布左右按钮
 * 2. .carousel-pagination - 分页器，使用绝对定位 + transform 居中
 * 3. .carousel-navigation-left/right - 左右按钮容器
 *
 * 居中原理：
 * - position: absolute - 使分页器脱离文档流
 * - left: 50% + top: 50% - 将分页器的左上角定位到容器中心
 * - transform: translate(-50%, -50%) - 将分页器自身向左上偏移50%，实现中心对齐
 * - z-index: 5 - 确保分页器在视觉上位于上层
 *
 * 响应式支持：
 * - 使用 CSS 变量控制尺寸，自动适配不同屏幕
 * - 移除移动端的 max-width 限制，确保始终居中
 * - padding 使用百分比，适应不同容器宽度
 */
.carousel-navigation {
    position: absolute;
    bottom: var(--carousel-nav-bottom, 48px);
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--carousel-nav-padding, 8%);
    z-index: 4;
}

.carousel-navigation-left,
.carousel-navigation-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
}

.carousel-pagination {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    gap: var(--carousel-dots-gap, 10px);
    padding: 0 var(--carousel-dots-padding, 24px);
    align-items: center;
    z-index: 5;
}

.carousel-btn {
    width: var(--carousel-nav-btn-size, 56px);
    height: var(--carousel-nav-btn-size, 56px);
    border: none;
    border-radius: 50%;
    background: var(--carousel-nav-btn-bg, rgba(255, 255, 255, 0.15));
    backdrop-filter: blur(10px);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.carousel-btn:hover {
    background: var(--carousel-nav-btn-hover, rgba(255, 255, 255, 0.25));
    transform: scale(var(--carousel-nav-btn-scale-hover, 1.08));
    border-color: rgba(255, 255, 255, 0.4);
}

.carousel-btn:active {
    transform: scale(var(--carousel-nav-btn-scale-active, 0.95));
}

.carousel-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.4);
}

.carousel-btn svg {
    width: var(--carousel-nav-icon-size, 26px);
    height: var(--carousel-nav-icon-size, 26px);
}

/* ========== 分页器样式 ========== */
.carousel-pagination {
    display: flex;
    gap: var(--carousel-dots-gap, 10px);
    padding: 0 var(--carousel-dots-padding, 24px);
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.carousel-dot {
    width: var(--carousel-dot-size, 10px);
    height: var(--carousel-dot-size, 10px);
    border-radius: 50%;
    background: var(--carousel-dot-bg, rgba(255, 255, 255, 0.4));
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
    will-change: transform, width, background-color;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.carousel-dot:hover {
    background: var(--carousel-dot-hover, rgba(255, 255, 255, 0.7));
    transform: scale(1.3);
}

.carousel-dot.active {
    background: #fff;
    width: var(--carousel-dot-active-width, 36px);
    border-radius: var(--carousel-dot-active-radius, 5px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transform: scale(1);
}

.carousel-dot.active::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 4px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-dot:hover::after {
    opacity: 1;
}

.carousel-dot:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.5);
}

/* 添加数字提示（可选） */
.carousel-dot::before {
    content: attr(data-index-display, '');
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    color: #fff;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    background: rgba(0, 0, 0, 0.8);
    padding: 2px 6px;
    border-radius: 3px;
    white-space: nowrap;
}

.carousel-dot:hover::before {
    opacity: 1;
}

/* ========== 进度条样式 ========== */
.carousel-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: var(--carousel-progress-height, 3px);
    background: var(--carousel-progress-bg, rgba(255, 255, 255, 0.1));
    z-index: 4;
    overflow: hidden;
}

.carousel-progress-bar {
    height: 100%;
    background: var(--carousel-progress-bar, #fff);
    will-change: width;
    transform: translateZ(0);
}

/* ========== 响应式设计 ========== */

/* 平板端 */
@media (max-width: 1024px) {
    :root {
        --carousel-title-size: 42px;
        --carousel-subtitle-size: 20px;
        --carousel-text-size: 15px;
        --carousel-content-left: 8%;
        --carousel-content-max-width: 500px;
        --carousel-nav-bottom: 40px;
        --carousel-nav-btn-size: 48px;
        --carousel-nav-icon-size: 22px;
        --carousel-dot-size: 8px;
        --carousel-dot-active-width: 28px;
    }
}

/* 手机端 */
@media (max-width: 768px) {
    :root {
        --carousel-content-left: 5%;
        --carousel-content-max-width: 90%;
        --carousel-nav-bottom: 32px;
        --carousel-nav-btn-size: 44px;
        --carousel-nav-icon-size: 20px;
        --carousel-dot-size: 8px;
        --carousel-dot-active-width: 24px;
        --carousel-nav-padding: 4%;
        --carousel-dots-gap: 5px;
        --carousel-dots-padding: 10px;
    }

    .carousel-content {
        padding: 0 20px;
    }

    .carousel-content h3 {
        font-size: 32px;
        margin-bottom: 16px;
    }

    .carousel-content strong {
        font-size: 20px;
        margin-bottom: 16px;
    }

    .carousel-content p {
        font-size: 15px;
        margin-bottom: 24px;
        -webkit-line-clamp: 2;
        max-height: 60px;
    }

    .carousel-content button,
    .carousel-content a.carousel-cta {
        padding: 12px 28px;
        font-size: 14px;
    }

    /* 导航按钮在手机端调整 */
    .carousel-navigation {
        padding: 0 10px;
    }

    .carousel-btn {
        width: 40px;
        height: 40px;
    }

    .carousel-btn svg {
        width: 18px;
        height: 18px;
    }
}

/* 超小屏幕 */
@media (max-width: 480px) {
    :root {
        --carousel-title-size: 26px;
        --carousel-subtitle-size: 18px;
        --carousel-text-size: 14px;
        --carousel-content-left: 5%;
        --carousel-nav-btn-size: 40px;
        --carousel-nav-icon-size: 18px;
        --carousel-dot-active-width: 20px;
        --carousel-nav-bottom: 24px;
        --carousel-dot-size: 7px;
        --carousel-dots-gap: 4px;
    }

    .carousel-content h3 {
        font-size: 24px;
    }

    .carousel-content strong {
        font-size: 18px;
    }

    .carousel-content p {
        font-size: 14px;
    }

    .carousel-dot {
        width: 7px;
        height: 7px;
    }

    .carousel-dot.active {
        width: 18px;
    }
}

/* ========== 无障碍支持 ========== */
.carousel-btn[aria-label] {
    position: relative;
}

.carousel-btn[aria-label]::after {
    content: attr(aria-label);
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

.carousel-dot[aria-label] {
    position: relative;
}

.carousel-dot[aria-label]::after {
    content: attr(aria-label);
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

/* ========== 性能优化 ========== */
.carousel-slide,
.carousel-image,
.carousel-content,
.carousel-btn,
.carousel-dot {
    will-change: transform, opacity;
}

.carousel-lazy {
    contain: layout;
}

/* ========== 过渡类型 ========== */

/* Slide 过渡 */
.carousel-container.carousel-type-slide .carousel-slide {
    transition: transform 0.6s ease;
    transform: translateX(100%);
}

.carousel-container.carousel-type-slide .carousel-slide.active {
    transform: translateX(0);
}

/* Scale 过渡 */
.carousel-container.carousel-type-scale .carousel-slide img {
    transition: transform 0.6s ease, opacity 0.6s ease;
    transform: scale(0.95);
}

.carousel-container.carousel-type-scale .carousel-slide.active img {
    transform: scale(1);
}