/**
 * 主要内容区域样式表
 * 包含：主容器、公告标签页、工具筛选栏
 * 功能：首页主要内容区域的完整样式定义
 */

/* ========================================
   基础变量和工具类
   ======================================== */

/* 主容器 - 页面核心布局容器 */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
    padding-top: calc(80px + 1.5rem); /* 导航栏完整高度 + 原有上边距 */
    animation: fadeInUp 0.6s ease-out; /* 使用公共动画库 */
}

/* ========================================
   公告区域 - 页面标题标签页
   ======================================== */

/* 公告区域整体容器 */
.placard-tabs-section {
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

/* 标签页主容器 - 玻璃拟态效果 */
.placard-tabs-container {
    position: relative;
    background: var(--gradient-surface);
    border-radius: 28px;
    backdrop-filter: var(--glass-backdrop-strong);
    -webkit-backdrop-filter: var(--glass-backdrop-strong);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    overflow: hidden;
}

/* 顶部装饰线 - 渐变强调 */
.placard-tabs-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: 28px 28px 0 0;
    z-index: 1;
    opacity: 0.6;
}

/* 标签页滚动容器 - 支持4个标签页 */
.placard-tabs-scroll {
    display: flex;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    width: 400%;
}

/* 单个标签页 - 基础状态 */
.placard-tab-item {
    width: 25%;
    flex-shrink: 0;
    text-align: center;
    padding: 1.5rem 0;
    opacity: 0.3;
    transition: opacity 0.4s ease;
}

.placard-tab-item.active {
    opacity: 1;
}

/* 标签页内容容器 */
.placard-tab-content {
    max-width: 500px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 主标题 - 渐变文字效果 */
.placard-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* 标题下划线动画 */
.placard-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    animation: titleUnderline 2s ease-out;
}

/* 副标题 - 次要信息展示 */
.placard-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
    font-weight: 400;
}

/* 指示器 - 标签页导航点 */
.placard-tabs-indicators {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem 0 1.5rem 0;
    position: relative;
    z-index: 2;
}

.placard-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
}

.placard-indicator.active {
    background: var(--primary-color);
    transform: scale(1.2);
    box-shadow: 0 0 8px rgba(99, 102, 241, 0.4);
}

.placard-indicator:hover {
    background: rgba(255, 255, 255, 0.5);
    transform: scale(1.1);
}

/* 导航按钮 - 左右切换 */
.placard-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.placard-nav-prev { left: 1rem; }
.placard-nav-next { right: 1rem; }

.placard-nav-btn:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-50%) scale(1.1);
    box-shadow: var(--shadow-lg);
}

.placard-nav-btn:active {
    transform: translateY(-50%) scale(0.95);
}

/* ========================================
   工具筛选栏 - 高级筛选功能
   ======================================== */

/* 筛选栏整体容器 */
.tool-filter {
    margin: 0 auto 1.5rem auto;
    max-width: 1200px;
    padding: 0 1rem;
}

/* 筛选栏布局容器 */
.filter-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}

/* 左侧固定区域 - 高级筛选按钮 */
.filter-fixed-left {
    flex-shrink: 0;
    position: relative;
    z-index: 100;
}

/* 右侧可滑动区域 - 标签页容器 */
.filter-scrollable {
    flex: 1;
    overflow: hidden;
    position: relative;
    --show-left-gradient: 0;
    --show-right-gradient: 1;
}

/* 标签页滚动容器 */
.filter-tabs-scroll {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding: 0.5rem 0;
    scrollbar-width: none;
    -ms-overflow-style: none;
    scroll-behavior: smooth;
}

.filter-tabs-scroll::-webkit-scrollbar {
    display: none;
}

/* 渐变遮罩效果 - 指示可滚动 */
.filter-scrollable::before,
.filter-scrollable::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 20px;
    pointer-events: none;
    z-index: 1;
    transition: opacity 0.3s ease;
}

.filter-scrollable::before {
    left: 0;
    background: linear-gradient(to right, var(--background-color), transparent);
    opacity: var(--show-left-gradient);
}

.filter-scrollable::after {
    right: 0;
    background: linear-gradient(to left, var(--background-color), transparent);
    opacity: var(--show-right-gradient);
}

/* 筛选标签按钮 - 基础样式 */
.filter-tab {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
    user-select: none;
}

.filter-tab:hover {
    color: var(--text-primary);
    border-color: var(--primary-color);
}

.filter-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ========================================
   高级筛选下拉菜单
   ======================================== */

.advanced-filter-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 0.5rem;
    background: var(--surface-color);
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    background: rgba(235, 235, 235, 0.8);
    width: 320px;
    max-height: 400px;
    overflow: hidden;
    z-index: 1000;
    display: none;
}

.advanced-filter-dropdown.active {
    display: block;
    animation: dropdownSlideIn 0.1s ease-out;
}

/* 下拉菜单内容区域 */
.filter-dropdown-content {
    padding: 0.8rem;
    max-height: 350px;
    overflow-y: auto;
}

.filter-group {
    margin-bottom: 0.6rem;
}

.filter-group:last-child {
    margin-bottom: 0;
}

/* 关键词搜索组 - 特殊样式 */
.filter-group.keyword-search {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(135, 133, 140, 0.08));
    border: 1px solid rgba(167, 167, 189, 0.2);
    border-radius: 8px;
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

/* 表单元素基础样式 */
.filter-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
}

.filter-input,
.filter-select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-light);
    border-radius: 6px;
    background: var(--background-color);
    color: var(--text-primary);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.filter-input:focus,
.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* 关键词搜索输入框 - 特殊样式 */
.filter-group.keyword-search .filter-label {
    display: none;
}

.filter-group.keyword-search .filter-input {
    padding: 0.75rem;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.15);
    flex: 1;
    margin-bottom: 0;
}

.filter-group.keyword-search .filter-input:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2), 0 4px 12px rgba(99, 102, 241, 0.2);
    transform: translateY(-1px);
}

/* 按钮组样式 */
.keyword-search-actions {
    display: flex;
    gap: 0.4rem;
    flex-shrink: 0;
}

.keyword-search-actions .filter-btn {
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 5px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 55px;
}

/* 复选框和单选框网格布局 */
.filter-checkboxes,
.filter-radios {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(75px, 1fr));
    gap: 0.3rem;
}

.checkbox-item,
.radio-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    padding: 0.4rem 0.3rem;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}

.checkbox-item:hover,
.radio-item:hover {
    background: var(--hover-color);
}

.checkbox-item input,
.radio-item input {
    margin: 0;
    cursor: pointer;
}

.checkbox-text,
.radio-text {
    font-size: 0.8rem;
    color: var(--text-primary);
    line-height: 1.2;
}

/* 按钮样式 - 统一设计 */
.filter-btn {
    padding: 0.4rem 0.8rem;
    border: none;
    border-radius: 5px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 55px;
}

.filter-btn-secondary {
    background: var(--surface-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.filter-btn-secondary:hover {
    background: var(--hover-color);
    color: var(--text-primary);
}

.filter-btn-primary {
    background: var(--primary-color);
    color: white;
}

.filter-btn-primary:hover {
    background: var(--primary-color-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 隐藏不使用的元素 */
.filter-dropdown-footer {
    display: none;
}

/* ========================================
   响应式设计 - 断点优化
   ======================================== */

/* 平板端响应式 (768px及以下) */
@media (max-width: 768px) {
    /* 主容器调整 */
    .main-container {
        padding: 1rem;
        padding-top: calc(80px + 1rem); /* 导航栏完整高度 + 原有上边距 */
    }
    
    .placard-tabs-section {
        margin-bottom: 1.2rem;
    }
    
    .placard-tab-item {
        padding: 1.2rem 0;
    }
    
    .placard-title {
        font-size: 1.8rem;
    }
    
    .placard-subtitle {
        font-size: 0.95rem;
    }
    
    .placard-nav-btn {
        width: 36px;
        height: 36px;
        font-size: 1.3rem;
    }
    
    .placard-nav-prev { left: 0.5rem; }
    .placard-nav-next { right: 0.5rem; }
    
    .placard-tabs-indicators {
        padding: 0.8rem 0 1.2rem 0;
    }
    
    /* 筛选栏调整 */
    .tool-filter {
        padding: 0 0.5rem;
        margin-bottom: 1.2rem;
    }
    
    .filter-container {
        gap: 0.8rem;
    }
    
    .filter-tabs-scroll {
        gap: 0.4rem;
    }
    
    .filter-tab {
        padding: 0.4rem 0.8rem;
        font-size: 0.85rem;
    }
    
    .advanced-filter-dropdown {
        width: 280px;
        max-height: 350px;
    }
    
    .filter-dropdown-content {
        padding: 0.6rem;
        max-height: 300px;
    }
    
    .filter-checkboxes,
    .filter-radios {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.2rem;
    }
    
    .checkbox-item,
    .radio-item {
        padding: 0.25rem 0.15rem;
        font-size: 0.7rem;
    }
    
    .checkbox-text,
    .radio-text {
        font-size: 0.7rem;
    }
    
    .filter-scrollable::before,
    .filter-scrollable::after {
        width: 15px;
    }
}

/* 手机端响应式 (480px及以下) */
@media (max-width: 480px) {
    .filter-container {
        gap: 0.4rem;
    }
    
    .filter-tabs-scroll {
        gap: 0.25rem;
    }
    
    .filter-tab {
        padding: 0.3rem 0.5rem;
        font-size: 0.75rem;
    }
    
    .advanced-filter-dropdown {
        width: calc(100vw - 2rem);
        max-height: 300px;
    }
    
    .filter-dropdown-content {
        padding: 0.5rem;
        max-height: 250px;
    }
    
    .filter-checkboxes,
    .filter-radios {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.15rem;
    }
    
    .checkbox-item,
    .radio-item {
        padding: 0.2rem 0.1rem;
        font-size: 0.65rem;
    }
    
    .checkbox-text,
    .radio-text {
        font-size: 0.65rem;
    }
    
    .filter-btn {
        padding: 0.35rem 0.6rem;
        font-size: 0.75rem;
        min-width: 45px;
    }
    
    .filter-scrollable::before,
    .filter-scrollable::after {
        width: 10px;
    }
    
    /* 公告区域手机端优化 */
    .placard-tabs-section {
        margin-bottom: 1rem;
    }
    
    .placard-tab-item {
        padding: 1rem 0;
    }
    
    .placard-title {
        font-size: 1.6rem;
    }
    
    .placard-subtitle {
        font-size: 0.9rem;
    }
    
    .placard-nav-btn {
        width: 32px;
        height: 32px;
        font-size: 1.2rem;
    }
    
    .placard-nav-prev { left: 0.3rem; }
    .placard-nav-next { right: 0.3rem; }
    
    .placard-tabs-indicators {
        padding: 0.6rem 0 1rem 0;
    }
    
    .placard-indicator {
        width: 6px;
        height: 6px;
    }
}

/* 超小屏幕优化 (360px及以下) */
@media (max-width: 360px) {
    .filter-group.keyword-search {
        padding: 0.4rem;
        gap: 0.3rem;
    }
    
    .filter-group.keyword-search .filter-input {
        padding: 0.6rem 0.5rem;
        font-size: 0.8rem;
    }
    
    .keyword-search-actions .filter-btn {
        padding: 0.3rem 0.4rem;
        font-size: 0.65rem;
        min-width: 35px;
    }
}