/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary: #165DFF;
    --secondary: #36CFC9;
    --accent1: #722ED1;
    --accent2: #F53F3F;
    --accent3: #FF7D00;
    --accent4: #14C9C9;
    --light: #F5F7FA;
    --dark: #1D2129;
    --gray: #86909C;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
}

body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
header {
    background-color: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 999;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo span {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary);
    transition: width 0.3s;
}

.nav-link:hover::after {
    width: 100%;
}

/* Banner区域 */
.banner {
    background: linear-gradient(135deg, #E8F4FF 0%, #F0F8FF 100%);
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

.banner-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.banner-left {
    flex: 1;
}

.banner-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.banner-title span {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    color: transparent;
}

.banner-desc {
    font-size: 18px;
    color: var(--gray);
    margin-bottom: 30px;
}

/* 优化Banner按钮布局 - 横向排列 */
.banner-buttons {
    display: flex;
    flex-direction: row;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center; /* 居中显示 */
}

.main-btn {
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
    /* 缩短按钮长度 - 关键修改 */
    flex: none; /* 取消自动拉伸 */
    width: auto; /* 宽度由内容决定 */
    min-width: 180px; /* 最小宽度调整 */
}

.primary-btn {
    background: linear-gradient(90deg, var(--primary), #0F52BA);
    color: white;
}

.secondary-btn {
    background: linear-gradient(90deg, var(--secondary), #0FB8B8);
    color: white;
}

.main-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(22, 93, 255, 0.3);
}

.banner-features {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(22, 93, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 18px;
}

.feature-text {
    font-size: 16px;
    font-weight: 500;
}

.authoritative-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.authoritative-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: white;
    font-size: 12px;
    font-weight: 600;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.authoritative-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.weipu {
    background: linear-gradient(135deg, var(--accent1), #5A23A6);
}

.wanfang {
    background: linear-gradient(135deg, var(--accent2), #D93636);
}

.daya {
    background: linear-gradient(135deg, var(--accent3), #E07000);
}

.yingwen {
    background: linear-gradient(135deg, var(--accent4), #0EA8A8);
}

.zh知网 {
    background: linear-gradient(135deg, var(--primary), #0F52BA);
}

.tongyong {
    background: linear-gradient(135deg, #7B61FF, #5D47E2);
}

.authoritative-label {
    font-size: 14px;
    color: var(--gray);
    margin-bottom: 10px;
}

.banner-right {
    flex: 1;
    position: relative;
    min-height: 400px;
}

/* 修复统计卡片动画显示异常问题 */
.stat-card {
    position: absolute;
    background: transparent; /* 移除底色 */
    border: 1px solid rgba(22, 93, 255, 0.1); /* 仅保留边框 */
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    width: 180px;
    z-index: 10;
    /* 优化动画效果 */
    animation: float 6s ease-in-out infinite;
    opacity: 1;
}

.stat-card:nth-child(1) {
    top: 20px;
    left: 20px;
    animation-delay: 0s;
}

.stat-card:nth-child(2) {
    top: 100px;
    right: 20px;
    animation-delay: 1s;
}

.stat-card:nth-child(3) {
    bottom: 80px;
    left: 60px;
    animation-delay: 2s;
}

.stat-card:nth-child(4) {
    bottom: 20px;
    right: 60px;
    animation-delay: 3s;
}

.stat-icon {
    font-size: 25px;
    color: var(--primary);
    margin-bottom: 10px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-15px);
    }
}

/* 移除flash动画避免闪烁异常 */
.banner-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23f5f7fa' fill-opacity='1' d='M0,192L48,176C96,160,192,128,288,128C384,128,480,160,576,181.3C672,203,768,213,864,202.7C960,192,1056,160,1152,149.3C1248,139,1344,149,1392,154.7L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E") no-repeat;
    background-size: cover;
}

/* 内容板块通用样式 - 优化视觉效果 */
.section {
    padding: 80px 0;
    position: relative;
}

/* 所有标题移除下划线，优化标题样式 */
.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    position: relative;
    color: var(--dark);
}

/* 标题装饰效果 */
.section-title span {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    color: transparent;
}

/* 通用卡片容器 - 移除底色和边框（从指定板块开始） */
.section-content {
    display: grid;
    gap: 30px;
}

/* 1. 小标题和图标放在一起的样式 */
.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background-color: rgba(22, 93, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 24px;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
    margin: 0;
}

.card-title::before {
    display: none;
}

/* AIGC检测是什么 - 网格布局 + 渐变卡片 */
.tool-section .section-content {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.tool-section .card {
    background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(240,248,255,0.8)) !important;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 8px 30px rgba(22,93,255,0.05), 0 2px 8px rgba(0,0,0,0.03) !important;
    border: none !important;
    transition: all 0.3s ease;
}

.tool-section .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(22, 93, 255, 0.15);
}

/* 检测流程板块 - 横向一排布局 */
.process-section {
    background: linear-gradient(180deg, #F8F9FA 0%, #E8F4FF 100%);
    overflow-x: hidden;
}

.process-section .section-content {
    grid-template-columns: repeat(5, 1fr);
    gap: 15px;
    width: 100%;
}

.process-step {
    background: white;
    border-radius: 12px;
    padding: 25px 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    position: relative;
    text-align: center;
    transition: all 0.3s ease;
}

.process-step::before {
    content: attr(data-step);
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    box-shadow: 0 2px 10px rgba(22,93,255,0.3);
}

.process-step .card-icon {
    background-color: rgba(54, 207, 201, 0.1);
    color: var(--secondary);
    margin: 0 auto 15px;
}

.process-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.process-step .card-text {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.5;
}

/* 检测原理板块 - 卡片式 + 不同背景色 */
.principle-section .section-content {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.principle-section .card {
    background: linear-gradient(145deg, rgba(255,255,255,0.95), rgba(248,250,252,0.9)) !important;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08), 0 -4px 0 rgba(22, 93, 255, 0.05) inset;
    border: none !important;
    transition: all 0.3s ease;
}

.principle-section .card:nth-child(1) {
    border-top: 4px solid var(--primary) !important;
}

.principle-section .card:nth-child(2) {
    border-top: 4px solid var(--accent1) !important;
}

.principle-section .card:nth-child(3) {
    border-top: 4px solid var(--accent4) !important;
}

.principle-section .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(22, 93, 255, 0.15);
}

/* 系统对比板块 - 表格样式优化 */
.comparison-section {
    background-color: #F8F9FA;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: white !important;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    margin-top: 20px;
}

.comparison-table th, .comparison-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(22, 93, 255, 0.05);
    font-size: 14px;
}

.comparison-table th {
    background-color: var(--primary);
    color: white;
    font-weight: 600;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover {
    background-color: rgba(248, 249, 250, 0.8);
    transform: scale(1.01);
    transition: transform 0.2s ease;
}

/* 服务数据板块 - 数据卡片样式 */
.data-section .section-content {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.data-section .card {
    background: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(240,248,255,0.8)) !important;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 8px 30px rgba(54,207,201,0.05), 0 2px 8px rgba(0,0,0,0.03) !important;
    border: none !important;
    text-align: center;
}

.data-section .card-header {
    justify-content: center;
}

.data-section .card-icon {
    background-color: rgba(114,46,209,0.1);
    color: var(--accent1);
}

.data-section .card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 30px rgba(114,46,209,0.1);
}

/* 价格对比板块 - 横向一排布局（热搜版） */
.price-section {
    background-color: #F8F9FA;
    padding: 80px 0;
}

.price-container {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: 20px;
    overflow-x: auto;
    padding: 10px 0;
    scrollbar-width: none;
}

.price-container::-webkit-scrollbar {
    display: none;
}

.price-card {
    flex: 1;
    min-width: 220px;
    background: linear-gradient(180deg, white 0%, #F8F9FF 100%);
    border-radius: 16px;
    padding: 30px 20px;
    box-shadow: 0 8px 25px rgba(22,93,255,0.08);
    border: 1px solid rgba(22,93,255,0.1);
    position: relative;
    transition: all 0.3s ease;
    text-align: center;
}

.price-card.hot {
    border: 2px solid var(--primary);
    transform: scale(1.05);
    box-shadow: 0 12px 30px rgba(22,93,255,0.15);
}

.price-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(22,93,255,0.15);
}

.price-badge {
    position: absolute;
    top: -10px;
    right: 20px;
    background: linear-gradient(90deg, var(--accent2), #FF5722);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(245,63,63,0.3);
}

.price-tag {
    font-size: 12px;
    color: var(--primary);
    background: rgba(22,93,255,0.1);
    padding: 3px 10px;
    border-radius: 15px;
    display: inline-block;
    margin-bottom: 10px;
}

.price-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    margin: 10px 0;
}

.price-value small {
    font-size: 16px;
    font-weight: 500;
    color: var(--gray);
}

.price-desc {
    font-size: 13px;
    color: var(--gray);
    margin-bottom: 15px;
    line-height: 1.4;
}

.price-features {
    margin: 15px 0;
    list-style: none;
    text-align: left;
}

.price-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--dark);
}

.price-features li::before {
    content: "✓";
    color: var(--secondary);
    font-weight: bold;
    font-size: 14px;
}

.price-btn {
    display: block;
    width: 100%;
    padding: 12px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: white;
    text-align: center;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 20px;
    transition: all 0.3s;
    font-size: 14px;
}

.price-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(22,93,255,0.2);
}

/* 系统优势  */
.reviews-section {
    background: white;
    padding: 80px 0;
}

.reviews-tags {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.review-tag-card {
    background: linear-gradient(145deg, #F8F9FF, #E8F4FF);
    border-radius: 12px;
    padding: 25px 15px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(22,93,255,0.05);
    transition: all 0.3s ease;
}

.review-tag-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(22,93,255,0.1);
}

.tag-icon {
    font-size: 32px;
    color: var(--primary);
    margin-bottom: 15px;
}

.tag-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
}

.tag-desc {
    font-size: 13px;
    color: var(--gray);
    margin-top: 8px;
}

/* 新增用户评价板块样式 - 2排8个图文评价 */
.user-reviews-section {
    background: white;
    padding: 80px 0;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.review-card {
    background: linear-gradient(145deg, #F8F9FF, #E8F4FF);
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(22,93,255,0.05);
    transition: all 0.3s ease;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(22,93,255,0.1);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

/* 用户头像修改为图片 - 关键修改 */
.user-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover; /* 保持图片比例 */
    border: 2px solid rgba(22, 93, 255, 0.2);
}

.user-info {
    flex: 1;
}

.user-name {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 3px;
}

.user-type {
    font-size: 12px;
    color: var(--gray);
}

.review-rating {
    color: #FFD700;
    margin: 10px 0;
    font-size: 14px;
}

.review-content {
    font-size: 14px;
    color: var(--dark);
    line-height: 1.6;
    margin-bottom: 15px;
}

.review-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.review-tag {
    font-size: 12px;
    padding: 3px 10px;
    background: rgba(22,93,255,0.1);
    color: var(--primary);
    border-radius: 12px;
}

/* 常见问题板块 - 2排8个问题 */
.faq-section {
    background: #F8F9FA;
    padding: 80px 0;
}

.faq-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.faq-item {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
}

.faq-question {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.faq-question::before {
    content: "Q";
    background: rgba(22,93,255,0.1);
    color: var(--primary);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.faq-answer {
    font-size: 14px;
    color: var(--gray);
    line-height: 1.6;
    padding-left: 34px;
}

/* 合作单位板块 */
.partner-section {
    background: white;
    padding: 80px 0;
}

.partner-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 40px;
}

.partner-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
}

.partner-item:hover {
    transform: scale(1.1);
}

.partner-icon {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    background: linear-gradient(145deg, #E8F4FF, #F0F8FF);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: var(--primary);
    box-shadow: 0 4px 15px rgba(22,93,255,0.1);
}

.partner-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
}

/* 注意事项板块 */
.notice-section {
    background: #F8F9FA;
    padding: 80px 0;
}

.notice-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.notice-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.notice-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.notice-title i {
    font-size: 24px;
}

.notice-list {
    list-style: none;
}

.notice-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 15px;
    font-size: 14px;
    color: var(--gray);
}

.notice-list li::before {
    content: "⚠";
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 2px;
}

/* 帮助中心板块 */
.help-section {
    background: white;
    padding: 80px 0;
}

.help-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.help-card {
    background: linear-gradient(145deg, #F8F9FF, #E8F4FF);
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(22,93,255,0.05);
    transition: all 0.3s ease;
}

.help-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(22,93,255,0.1);
}

.help-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.help-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: rgba(22,93,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 28px;
}

.help-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
    margin: 0;
}

.help-list {
    list-style: none;
}

.help-list li {
    margin-bottom: 10px;
}

.help-list li a {
    text-decoration: none;
    color: var(--gray);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
}

.help-list li a:hover {
    color: var(--primary);
    padding-left: 5px;
}

.help-list li a::before {
    content: "→";
    color: var(--primary);
    opacity: 0;
    transition: opacity 0.3s;
}

.help-list li a:hover::before {
    opacity: 1;
}

/* 数据可视化样式 */
.data-chart {
    width: 100%;
    height: 100px;
    background: rgba(22, 93, 255, 0.05);
    border-radius: 8px;
    margin: 15px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: rgba(0,0,0,.6);
    border: 1px dashed rgba(22, 93, 255, 0.2);
}

.tech-tag {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(22, 93, 255, 0.1);
    color: var(--primary);
    border-radius: 20px;
    font-size: 12px;
    margin: 0 5px 8px 0;
}

/* 页脚样式 */
footer {
    background-color: var(--dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
    position: relative;
    color: white;
}

/* 新增页脚标题装饰 */
.footer-col h3::before {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    margin-right: 8px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: #CCCCCC;
    text-decoration: none;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-col ul li a::before {
    content: "→";
    color: var(--primary);
    opacity: 0;
    transition: opacity 0.3s;
}

.footer-col ul li a:hover {
    color: white;
    padding-left: 8px;
}

.footer-col ul li a:hover::before {
    opacity: 1;
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
    color: #999;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .banner-container {
        flex-direction: column;
        text-align: center;
    }

    .banner-features {
        justify-content: center;
    }

    .authoritative-buttons {
        justify-content: center;
    }

    .banner-right {
        margin-top: 40px;
        height: 400px;
    }
    
    /* 检测流程响应式 */
    .process-section .section-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 价格对比响应式 */
    .price-container {
        flex-wrap: wrap;
    }
    
    .price-card {
        min-width: 45%;
    }
    
    /* 用户评价响应式 */
    .reviews-tags {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 帮助中心响应式 */
    .help-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        gap: 15px;
    }

    .banner-title {
        font-size: 32px;
    }

    .section-title {
        font-size: 28px;
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .banner-buttons {
        flex-direction: column;
    }
    
    .main-btn {
        min-width: 100%;
    }
    
    /* 常见问题响应式 */
    .faq-container {
        grid-template-columns: 1fr;
    }
    
    /* 注意事项响应式 */
    .notice-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .navbar {
        flex-direction: column;
        gap: 15px;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .banner-title {
        font-size: 26px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
    
    /* 检测流程响应式 */
    .process-section .section-content {
        grid-template-columns: 1fr;
    }
    
    /* 价格对比响应式 */
    .price-card {
        min-width: 100%;
    }
    
    /* 用户评价响应式 */
    .reviews-tags {
        grid-template-columns: 1fr;
    }
    
    /* 帮助中心响应式 */
    .help-container {
        grid-template-columns: 1fr;
    }
    
    .card-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}