/* ================= 基础全局变量 ================= */
:root { 
    --bg-color: #f5f6f8; 
    --primary-red: #ff4d4f; 
    --primary-blue: #3b82f6; 
    --primary-green: #67c23a;
    --text-main: #333333; 
    --text-sub: #888888; 
    --border-color: #ebeef5;
}
body { margin: 0; font-family: 'Helvetica Neue', Arial, sans-serif; background-color: var(--bg-color); color: var(--text-main); }
a { text-decoration: none; color: inherit; }

/* ================= 头部导航区域 (PC端/全局) ================= */
.sticky-header { 
    position: sticky; 
    top: 0; 
    z-index: 1000; 
    background-color: var(--bg-color); 
    box-shadow: 0 4px 15px rgba(0,0,0,0.03); 
    padding-bottom: 5px; 
}

.header-container { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 20px 40px; 
    gap: 20px; 
    flex-wrap: nowrap; 
}

/* 通用搜索框容器布局 */
.search-box { 
    flex: 1; 
    position: relative; 
    min-width: 250px; 
}

/* 全局普通搜索框样式 */
.search-box input { 
    width: 100%; 
    padding: 12px 20px 12px 40px; 
    border-radius: 25px; 
    border: 1px solid #e5e7eb; 
    outline: none; 
    font-size: 14px; 
    box-sizing: border-box; 
    transition: box-shadow 0.3s; 
}
.search-box input:focus { 
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); 
    border-color: #93c5fd; 
}
.search-icon { 
    position: absolute; 
    left: 15px; 
    top: 50%; 
    transform: translateY(-50%); 
    color: var(--text-sub); 
}

/* TIKTOK 专属搜索框重载样式 */
.tiktok-search input {
    border: 2px solid #111111;
    border-radius: 8px; /* TikTok风格偏向圆角矩形 */
}
.tiktok-search input:focus {
    border-color: #fe2c55; /* TikTok 红 */
    box-shadow: 0 0 0 3px rgba(254, 44, 85, 0.1);
}

/* 按钮区 */
.action-buttons { display: flex; gap: 12px; flex-shrink: 0; align-items: center;}
.btn { padding: 10px 22px; border-radius: 25px; font-weight: bold; font-size: 14px; transition: transform 0.2s, opacity 0.2s; display: inline-flex; align-items: center; justify-content: center; gap: 6px; cursor: pointer; white-space: nowrap; }
.btn:hover { transform: translateY(-2px); opacity: 0.9; }

.btn-invite { background: linear-gradient(135deg, #ff6b6b, #ff4d4f); color: white; box-shadow: 0 4px 10px rgba(255, 77, 79, 0.3); border: 2px solid transparent; }
.btn-tutorial { background: white; color: var(--primary-blue); border: 2px solid var(--primary-blue); }

/* ================= 独立子页面头部 (分类页) ================= */
.category-page-header { display: flex; align-items: center; justify-content: space-between; padding: 15px 40px; background-color: var(--bg-color); }
.btn-back-home { padding: 8px 16px; background: #ffffff; border: 1px solid #dcdfe6; border-radius: 20px; cursor: pointer; font-weight: bold; color: #333; display: flex; align-items: center; gap: 4px; text-decoration: none; flex-shrink: 0; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.category-title { font-size: 20px; font-weight: 900; color: #1a1a1a; text-transform: uppercase; margin: 0; position: absolute; left: 50%; transform: translateX(-50%); white-space: nowrap; }
.cat-search-wrapper { position: relative; width: 250px; }
.cat-search-wrapper input { width: 100%; padding: 10px 15px 10px 35px; border: 1px solid #e5e7eb; border-radius: 25px; outline: none; font-size: 14px; box-sizing: border-box; background-color: #ffffff; }
.cat-search-wrapper input:focus { box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); border-color: #93c5fd; }
.cat-search-wrapper .search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-sub); font-size: 14px; }

/* ================= 二级类目过滤器条 ================= */
.sub-category-bar {
    display: flex;
    gap: 12px;
    padding: 10px 40px; 
    background-color: var(--bg-color);
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none; 
}
.sub-category-bar::-webkit-scrollbar { display: none; }

.sub-cat-btn {
    padding: 6px 18px;
    border: 1px solid #dcdfe6;
    border-radius: 20px;
    background-color: #ffffff;
    color: #606266;
    cursor: pointer;
    font-size: 13px;
    font-weight: bold;
    transition: all 0.2s ease;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.sub-cat-btn:hover {
    background-color: #f5f7fa;
    color: var(--primary-blue);
    border-color: #c6e2ff;
}

.sub-cat-btn.active {
    background-color: var(--primary-blue);
    color: #ffffff;
    border-color: var(--primary-blue);
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.2);
}

/* ================= 一级分类过滤器 ================= */
.filter-container { padding: 5px 40px 15px; display: flex; gap: 12px; overflow-x: auto; scrollbar-width: none; }
.filter-container::-webkit-scrollbar { display: none; }
.filter-btn { padding: 10px 24px; border-radius: 25px; background: white; border: 1px solid #e5e7eb; color: var(--text-main); font-weight: 600; cursor: pointer; white-space: nowrap; transition: all 0.3s ease; display: flex; align-items: center; gap: 6px; box-shadow: 0 2px 4px rgba(0,0,0,0.02); font-size: 14px; text-transform: uppercase; }
.filter-btn:hover { border-color: var(--primary-blue); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(59,130,246,0.12); }
.filter-btn.active { background: #1a1a1a; color: white; border-color: #1a1a1a; box-shadow: 0 6px 16px rgba(0,0,0,0.18); }
.cat-icon { font-size: 16px; line-height: 1; }

/* ================= 商品网格 ================= */
.grid-container { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 20px; padding: 10px 40px 40px; }
.product-card { background: white; border-radius: 12px; overflow: hidden; transition: transform 0.2s, box-shadow 0.2s; cursor: pointer; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid transparent; height: 100%; }
.product-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.08); border-color: var(--border-color); }
.product-card > a { display: flex; flex-direction: column; flex: 1; color: inherit; text-decoration: none; }
.product-content { display: flex; flex-direction: column; flex: 1; }
.image-box { width: 100%; padding-top: 100%; position: relative; background-color: #f9fafb; }
.product-img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: contain; padding: 10px; box-sizing: border-box; }
.info-box { padding: 12px; flex: 1; display: flex; flex-direction: column; justify-content: flex-start; gap: 4px; }
.product-title { font-size: 14px; color: var(--text-main); margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.3; }
.product-price { font-size: 16px; font-weight: bold; color: var(--primary-red); margin: 0; white-space: nowrap; }

/* ================= QC 按钮 ================= */
.qc-btn-container { padding: 10px 15px 15px; text-align: center; }
.btn-check-more { width: 100%; padding: 9px 0; background: #f4f5f8; color: #4b5563; border: 1px solid transparent; border-radius: 20px; font-size: 13px; font-weight: 600; cursor: pointer; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); display: inline-flex; justify-content: center; align-items: center; gap: 6px; box-sizing: border-box; text-decoration: none; }
.btn-check-more:hover { background: #ffffff; color: var(--primary-blue); border-color: rgba(59, 130, 246, 0.3); box-shadow: 0 6px 16px rgba(59, 130, 246, 0.12); transform: translateY(-2px); }
.btn-check-more svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

/* ================= 质检图相册 (qc.html) ================= */
.qc-header { position: sticky; top: 0; padding: 12px 15px; background: white; box-shadow: 0 2px 10px rgba(0,0,0,0.05); display: flex; justify-content: space-between; align-items: center; z-index: 100; min-height: 54px; box-sizing: border-box; }
.qc-header h1 { margin: 0 10px; font-size: 16px; font-weight: 600; color: #333; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; text-align: center; }
.back-btn { flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; color: #4b5563; text-decoration: none; background: #f4f5f8; padding: 8px 14px; border-radius: 20px; font-size: 14px; font-weight: bold; border: 1px solid transparent; transition: all 0.2s; white-space: nowrap; }
.back-btn svg { width: 16px; height: 16px; margin-right: 4px; }
.back-btn:hover { background: white; border-color: rgba(59, 130, 246, 0.3); color: #3b82f6; box-shadow: 0 4px 10px rgba(59, 130, 246, 0.1); }
.header-spacer { width: 75px; flex-shrink: 0; }

.gallery { padding: 30px 20px; display: flex; flex-direction: column; align-items: center; gap: 30px; max-width: 800px; margin: 0 auto; }
.qc-item { width: 100%; background: white; padding: 15px; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.03); box-sizing: border-box; }
.qc-img { width: 100%; height: auto; border-radius: 8px; display: block; }
.loader { margin-top: 100px; font-size: 16px; color: #888; text-align: center;}

/* ================= 无缝底部导航栏 ================= */
.bottom-tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 65px;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 -2px 15px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom);
}

.tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #909399;
    flex: 1;
    cursor: pointer;
    transition: color 0.3s ease;
    -webkit-tap-highlight-color: transparent;
}

.tab-item.active {
    color: var(--primary-red);
}

.tab-name {
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.5px;
}

/* 中间 ALL 容器的专属凸起样式 */
.center-tab {
    position: relative;
    top: -15px;
}

.center-circle {
    width: 60px;
    height: 60px;
    background-color: #ffffff;
    color: #909399;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    border: 5px solid #f5f6f8; 
    transition: all 0.3s ease;
}

.center-tab.active .center-circle {
    background-color: var(--primary-red);
    color: white;
    border-color: #ffffff;
    box-shadow: 0 4px 12px rgba(255, 77, 79, 0.4);
}

.center-tab .tab-name {
    font-size: 14px;
}

/* ================= 响应式调整 (手机端) ================= */
@media (max-width: 768px) {
    .header-container { flex-direction: column; padding: 15px; gap: 15px; }
    .search-box { width: 100%; min-width: unset; }
    .action-buttons { width: 100%; flex-wrap: wrap; justify-content: center; gap: 10px; }
    
    .btn { 
        flex: 1; 
        min-width: 140px; 
        padding: 10px; 
        font-size: 13px; 
        white-space: normal;  
        line-height: 1.4; 
        text-align: center;
    }
    
    .category-page-header { padding: 10px 15px; gap: 10px; }
    .category-title { display: none; }
    .cat-search-wrapper { width: 100%; flex-grow: 1; }

    .sub-category-bar { padding: 5px 15px 10px; }
    .filter-container { padding: 5px 15px 15px; }
    
    /* 防止底部商品被导航栏遮挡，增加下边距 */
    .grid-container { 
        padding: 5px 15px 90px; 
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); 
        gap: 15px; 
    }
    
    .product-title { font-size: 12px; -webkit-line-clamp: 1; }
    .product-price { font-size: 14px; }
}

@media (min-width: 769px) {
    .grid-container {
        padding-bottom: 90px; 
    }
}

/* 修改悬浮发帖按钮区：把 border-radius 从 25px 改小，使其变成长方形 */
.floating-seller-btn { position: fixed; bottom: 80px; left: 0; width: 100%; display: flex; justify-content: center; gap: 15px; z-index: 900; pointer-events: none; }
.floating-seller-btn button { 
    pointer-events: auto; 
    padding: 10px 20px; 
    border-radius: 6px; /* 这里从圆角的 25px 改为长方形的 6px */
    font-weight: bold; 
    border: none; 
    cursor: pointer; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.15); 
    transition: transform 0.2s; 
}
.btn-become-seller { background: white; color: #ff4d4f; border: 1px solid #ff4d4f !important; }
.btn-post-resell { background: #ff4d4f; color: white; }

/* 弹窗样式：为 modal-content 新增 position: relative 以便定位关闭按钮 */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 2000; display: flex; justify-content: center; align-items: center; }
.modal-content { 
    position: relative; /* 这是新增的属性 */
    background: white; 
    width: 90%; 
    max-width: 400px; 
    border-radius: 12px; 
    padding: 20px; 
    text-align: center; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.2); 
}

/* 新增：弹窗右上角的关闭 X 按钮样式 */
.close-modal-btn {
    position: absolute;
    top: 12px;
    right: 15px;
    font-size: 26px;
    color: #909399;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}
.close-modal-btn:hover {
    color: #ff4d4f;
}
/* 二手发帖表单 */
.resell-form-box { display: flex; flex-direction: column; gap: 12px; }
.form-input, .form-textarea { width: 100%; padding: 10px; border: 1px solid #dcdfe6; border-radius: 6px; box-sizing: border-box; font-family: inherit; }
.form-textarea { resize: vertical; min-height: 80px; }
.btn-submit-post { background: #ff4d4f; color: white; padding: 12px; border-radius: 25px; border: none; font-weight: bold; font-size: 16px; cursor: pointer; margin-top: 10px; transition: opacity 0.2s;}
.btn-submit-post:hover { opacity: 0.9; }

/* 购买与联系卖家按钮 (图一) */
.resell-actions { display: flex; gap: 10px; }
.btn-buy-now { flex: 1; background: #ff4d4f; color: white; padding: 8px 0; border-radius: 20px; font-size: 13px; font-weight: bold; text-align: center; border: none; cursor: pointer;}
.btn-buy-now:hover { opacity: 0.9; }
.btn-contact-seller { flex: 1; background: white; color: #333; border: 1px solid #ccc; padding: 8px 0; border-radius: 20px; font-size: 13px; font-weight: bold; cursor: pointer; }