/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 - 深蓝色主题 */
:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --light-blue: #dbeafe;
    --dark-blue: #1e40af;
    --accent-blue: #2563eb;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --white: #ffffff;
    --light-gray: #f8fafc;
    --border-color: #e5e7eb;
    --success-green: #10b981;
    --warning-yellow: #f59e0b;
    --danger-red: #ef4444;
}

/* 基础样式 */
body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    font-size: 16px;
}

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

/* 头部导航 */
.header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    box-shadow: 0 2px 10px rgba(30, 58, 138, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.logo-img {
    height: 35px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
}

.logo-text h1 {
    color: var(--white);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.logo-text span {
    color: var(--light-blue);
    font-size: 0.9rem;
    font-weight: 400;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 6px;
}

.nav-menu a:hover {
    color: var(--light-blue);
    background-color: rgba(255, 255, 255, 0.1);
}

/* 快捷导航栏 */
.quick-nav {
    background-color: var(--light-blue);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 90px;
    left: 0;
    right: 0;
    z-index: 999;
    padding: 0.8rem 0;
    box-shadow: 0 2px 10px rgba(30, 58, 138, 0.1);
}

.quick-nav-items {
    display: flex;
    justify-content: center;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.quick-nav a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.quick-nav a:hover {
    background-color: var(--primary-blue);
    color: var(--white);
}

/* 全屏Banner */
.hero-banner {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 50%, var(--accent-blue) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    margin-top: 140px;
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.banner-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem;
    position: relative;
    z-index: 2;
}

.banner-text {
    color: var(--white);
}

.banner-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.banner-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--light-blue);
}

.banner-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 3rem;
    opacity: 0.95;
}

.banner-stats {
    display: flex;
    gap: 3rem;
    margin-bottom: 3rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--light-blue);
    font-weight: 500;
}

.banner-buttons {
    display: flex;
    gap: 1.5rem;
}

.cta-button {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: none;
    position: relative;
    overflow: hidden;
}

.cta-button.primary {
    background: linear-gradient(45deg, var(--success-green), #34d399);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
    animation: pulse 2s infinite;
}

.cta-button.secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border: 2px solid var(--white);
    backdrop-filter: blur(10px);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Banner视觉元素 */
.banner-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-element {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.detection-demo {
    width: 320px;
    height: 200px;
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.demo-image {
    width: 100%;
    height: 120px;
    object-fit: cover;
    border-radius: 15px 15px 0 0;
}

.demo-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    padding: 1rem;
    color: var(--text-dark);
    height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 已在上面重新定义demo-overlay */

.demo-progress {
    margin-bottom: 1rem;
}

.progress-bar {
    width: 89%;
    height: 8px;
    background: linear-gradient(90deg, var(--success-green), var(--secondary-blue));
    border-radius: 4px;
    margin-bottom: 0.5rem;
    animation: progress 3s ease-in-out infinite;
}

@keyframes progress {
    0%, 100% { width: 89%; }
    50% { width: 95%; }
}

.demo-progress span {
    font-size: 0.8rem;
    color: var(--text-dark);
    font-weight: 500;
}

.demo-results {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.demo-results {
    display: flex;
    gap: 0.3rem;
    flex-wrap: wrap;
}

.result-item {
    padding: 0.2rem 0.5rem;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 500;
    white-space: nowrap;
}

.result-item:nth-child(1) {
    background-color: #dcfce7;
    color: var(--success-green);
}

.result-item.warning {
    background-color: #fef3c7;
    color: var(--warning-yellow);
}

.result-item:nth-child(3) {
    background-color: #dcfce7;
    color: var(--success-green);
}

/* 通用版块样式 */
.section {
    padding: 5rem 0;
}

.section.bg-light {
    background-color: var(--light-gray);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    text-align: center;
    margin-bottom: 3rem;
    line-height: 1.3;
}

/* 产品介绍 */
.intro-content {
    max-width: 1000px;
    margin: 0 auto;
}

.intro-description {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-dark);
    margin-bottom: 3rem;
    text-align: center;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(30, 58, 138, 0.15);
}

.feature-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 50%;
    margin: 0 auto 1rem;
    display: block;
    border: 3px solid var(--light-blue);
}

.feature-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.feature-item p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 检测原理 */
.principle-steps {
    max-width: 900px;
    margin: 0 auto;
}

.step-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--white);
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.08);
    border-left: 5px solid var(--secondary-blue);
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.step-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.step-content p {
    color: var(--text-dark);
    line-height: 1.7;
}

/* 使用指南 */
.guide-tabs {
    max-width: 800px;
    margin: 0 auto;
}

.tab-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 1rem 2rem;
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-blue);
    color: var(--white);
    border-color: var(--primary-blue);
}

.tab-content {
    background: var(--white);
    border-radius: 15px;
    padding: 2.5rem;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.1);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.tab-panel h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

.guide-steps p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.guide-steps strong {
    color: var(--primary-blue);
    font-weight: 600;
}

/* 价格方案 */
.pricing-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.7;
}

.pricing-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    border-radius: 20px;
    padding: 2.5rem;
    text-align: center;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.1);
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
}

.pricing-card.featured {
    border-color: var(--secondary-blue);
    transform: scale(1.05);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.pricing-card.featured::before {
    content: '推荐';
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--secondary-blue);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.card-header h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin-bottom: 2rem;
}

.currency {
    font-size: 1.2rem;
    color: var(--text-light);
}

.amount {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin: 0 0.2rem;
}

.period {
    font-size: 1rem;
    color: var(--text-light);
}

.card-features ul {
    list-style: none;
    text-align: left;
    margin-bottom: 2rem;
}

.card-features li {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--light-gray);
    font-size: 0.95rem;
}

.card-features li:last-child {
    border-bottom: none;
}

.pricing-btn {
    width: 100%;
    padding: 1rem;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.pricing-btn:hover {
    background: var(--dark-blue);
    transform: translateY(-2px);
}

/* 核心优势 */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.advantage-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.08);
    border-left: 4px solid var(--secondary-blue);
    transition: transform 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-3px);
}

.advantage-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.advantage-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.advantage-item p {
    color: var(--text-dark);
    line-height: 1.6;
}

/* 产品对比表格 */
.comparison-table-container {
    overflow-x: auto;
    margin: 2rem 0;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.1);
}

.comparison-table th,
.comparison-table td {
    padding: 1.2rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

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

.comparison-table th.highlight {
    background: var(--secondary-blue);
}

.comparison-table td.highlight {
    background: var(--light-blue);
    font-weight: 600;
    color: var(--primary-blue);
}

.comparison-note {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--light-blue);
    border-radius: 10px;
    font-size: 0.95rem;
    color: var(--primary-blue);
}

/* 常见问题 */
.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border-radius: 10px;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(30, 58, 138, 0.05);
    border: 1px solid var(--border-color);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.faq-question:hover {
    background-color: var(--light-gray);
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-blue);
    flex: 1;
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--secondary-blue);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 1.5rem 1.5rem;
    display: none;
    color: var(--text-dark);
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    display: block;
}

/* 用户评价 */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.review-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.08);
    border: 1px solid var(--border-color);
}

.review-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.reviewer-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.reviewer-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--light-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.reviewer-details h4 {
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 0.2rem;
}

.reviewer-details span {
    font-size: 0.9rem;
    color: var(--text-light);
}

.review-rating {
    color: var(--warning-yellow);
    font-size: 1.2rem;
}

.review-content {
    color: var(--text-dark);
    line-height: 1.7;
    font-style: italic;
}

/* 数据统计 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.stat-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.1);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-blue);
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.stat-desc {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* 合作伙伴 */
.partners-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 3rem;
    line-height: 1.7;
}

.partners-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.partner-category {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.08);
}

.partner-category h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

.partner-logos {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
    justify-content: center;
}

.partner-logo {
    height: 40px;
    width: auto;
    max-width: 120px;
    object-fit: contain;
    filter: grayscale(80%) brightness(1.2);
    transition: all 0.3s ease;
    padding: 0.5rem;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(30, 58, 138, 0.1);
}

.partner-logo:hover {
    filter: grayscale(0%) brightness(1);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(30, 58, 138, 0.15);
}

.partner-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.partner-item {
    background: var(--light-blue);
    color: var(--primary-blue);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 注意事项 */
.notices-content {
    max-width: 1000px;
    margin: 0 auto;
}

.notice-section {
    margin-bottom: 3rem;
}

.notice-section h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

.notice-list {
    background: var(--white);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 5px 20px rgba(30, 58, 138, 0.08);
}

.notice-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.notice-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.notice-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--secondary-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.notice-text strong {
    color: var(--primary-blue);
    font-weight: 600;
}

.notice-text {
    line-height: 1.7;
    color: var(--text-dark);
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-section p {
    color: var(--light-blue);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.footer-stats {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-stats span {
    color: var(--light-blue);
    font-size: 0.9rem;
}

.footer-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.footer-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.footer-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-legal p {
    color: var(--light-blue);
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.footer-features {
    display: flex;
    gap: 2rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--light-blue);
    font-size: 0.9rem;
}

.feature-count {
    color: var(--white);
    font-weight: 600;
}

/* 浮动按钮 */
.floating-buttons {
    position: fixed;
    right: 2rem;
    bottom: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 1000;
}

.float-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--secondary-blue);
    color: var(--white);
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}

.float-btn:hover {
    background: var(--primary-blue);
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .quick-nav {
        display: none;
    }
    
    .hero-banner {
        margin-top: 70px;
    }
    
    .logo {
        gap: 0.5rem;
    }
    
    .logo-img {
        height: 30px;
        max-width: 100px;
    }
    
    .detection-demo {
        width: 280px;
        height: 180px;
    }
    
    .demo-image {
        height: 100px;
    }
    
    .demo-overlay {
        height: 80px;
        padding: 0.8rem;
    }
    
    .partner-logos {
        gap: 0.8rem;
    }
    
    .partner-logo {
        height: 35px;
        max-width: 100px;
    }
    
    .banner-content {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 2rem 1rem;
    }
    
    .banner-title {
        font-size: 2.5rem;
    }
    
    .banner-stats {
        justify-content: center;
        gap: 2rem;
    }
    
    .banner-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-container {
        padding: 1rem;
    }
    
    .nav-menu {
        display: none;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-grid,
    .advantages-grid,
    .reviews-grid,
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-table {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .tab-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .floating-buttons {
        right: 1rem;
        bottom: 1rem;
    }
    
    .partner-logos {
        gap: 0.5rem;
    }
    
    .partner-logo {
        height: 30px;
        max-width: 80px;
    }
    
    .feature-image {
        width: 60px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .banner-title {
        font-size: 2rem;
    }
    
    .banner-subtitle {
        font-size: 1.2rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeInUp 0.8s ease-out;
}

/* 滚动行为 */
html {
    scroll-behavior: smooth;
}

/* 选择文本样式 */
::selection {
    background-color: var(--secondary-blue);
    color: var(--white);
}

/* 焦点样式 */
button:focus,
input:focus {
    outline: 2px solid var(--secondary-blue);
    outline-offset: 2px;
}