* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --bg-light: #ffffff;
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: rgba(0, 0, 0, 0.08);
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

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

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header .logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header .logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
    color: #fff;
}

.header .logo h1 {
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 600;
}

.header .nav {
    display: flex;
    gap: 25px;
    align-items: center;
}

.header .nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.header .nav a:hover {
    color: var(--text-primary);
}

.header .nav .btn-register {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: #fff;
    padding: 9px 20px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
}

.header .nav .btn-register:hover {
    opacity: 0.9;
}

/* Hero Section */
.hero {
    padding: 70px 0 90px;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.hero-content {
    text-align: left;
}

.hero-content .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 14px;
    padding: 5px 12px;
    font-size: 12px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.hero-content .badge span {
    width: 6px;
    height: 6px;
    background: #10b981;
    border-radius: 50%;
}

.hero-content h2 {
    font-size: 38px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 18px;
    color: var(--text-primary);
}

.hero-content h2 .highlight {
    color: var(--primary-color);
}

.hero-content p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 30px;
    max-width: 420px;
}

.hero-buttons {
    display: flex;
    gap: 12px;
}

.btn-primary {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: #fff;
    padding: 12px 26px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: transparent;
    border: 1px solid rgba(0, 0, 0, 0.15);
    color: var(--text-primary);
    padding: 12px 26px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.03);
}

.hero-qrcode {
    display: flex;
    justify-content: center;
}

.qrcode-box {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.qrcode-box img {
    width: 170px;
    height: 170px;
    border-radius: 10px;
    margin-bottom: 14px;
}

.qrcode-box p {
    font-size: 12px;
    color: var(--text-muted);
}

/* Features Section */
.features {
    padding: 50px 0;
}

.features .container {
    text-align: center;
}

.features h3 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.features .subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 35px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.feature-item {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 25px 18px;
    text-align: left;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.feature-item:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.feature-item .icon-wrapper {
    margin-bottom: 14px;
}

.feature-item .icon {
    font-size: 28px;
}

.feature-item h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.feature-item p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Pricing Section */
.pricing {
    padding: 50px 0 70px;
}

.pricing .container {
    text-align: center;
}

.pricing h3 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.pricing .subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 35px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 700px;
    margin: 0 auto;
}

.pricing-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    text-align: left;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.pricing-card.featured {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-color: rgba(99, 102, 241, 0.2);
}

.pricing-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.pricing-card .price {
    font-size: 44px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.pricing-card .description {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.pricing-card ul {
    list-style: none;
    padding: 0;
    margin-bottom: 28px;
}

.pricing-card li {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 7px 0;
    padding-left: 20px;
    position: relative;
}

.pricing-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-size: 13px;
}

.btn-pricing {
    display: inline-block;
    width: 100%;
    text-align: center;
    padding: 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.btn-pricing.primary {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: #fff;
}

.btn-pricing.secondary {
    background: transparent;
    border: 1px solid rgba(0, 0, 0, 0.15);
    color: var(--text-primary);
}

.btn-pricing.secondary:hover {
    background: rgba(0, 0, 0, 0.03);
}

/* Footer */
.footer {
    background: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 35px 0 15px;
}

.footer-content {
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 15px;
}

.footer .container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 30px;
}

.footer-brand {
    text-align: left;
}

.footer-brand .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.footer-brand .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: bold;
    color: #fff;
}

.footer-brand h3 {
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
}

.footer-brand p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

.footer-section h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    margin-bottom: 8px;
}

.footer-section a {
    font-size: 12px;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--text-secondary);
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.mfooter-icp {
    display: inline-block;
    font-size: 12px;
    color: #475569;
    text-decoration: none;
    transition: color 0.3s ease;
}

.mfooter-icp:hover {
    color: #334155;
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 900px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h2 {
        font-size: 28px;
    }

    .hero-content p {
        margin: 0 auto 30px;
    }

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

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer .container {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 15px;
    }

    .header .nav {
        gap: 12px;
    }

    .header .nav a {
        font-size: 12px;
    }

    .header .nav .btn-register {
        padding: 7px 14px;
        font-size: 12px;
    }

    .hero {
        padding: 50px 0 70px;
    }

    .hero-content h2 {
        font-size: 24px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .footer .container {
        grid-template-columns: 1fr;
        gap: 25px;
    }

    .footer-brand {
        text-align: center;
    }

    .footer-brand .logo {
        justify-content: center;
    }
}

/* Additional styles for other pages */
.page-banner {
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
    background: #ffffff;
}

.page-banner h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.page-banner p {
    font-size: 14px;
    color: var(--text-muted);
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-header h2 {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.section-header p {
    font-size: 13px;
    color: var(--text-muted);
}

/* Card styles */
.card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 24px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.card:hover {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* Form styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 14px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group select option {
    background: #ffffff;
    color: var(--text-primary);
}

.form-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.modal-content h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.close-modal {
    float: right;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.3s ease;
}

.close-modal:hover {
    color: var(--text-primary);
}

/* ===== 二维码功能页面样式 ===== */
.qrcode-page {
    padding: 50px 0 70px;
}

.qrcode-page .container {
    max-width: 1000px;
}

.qrcode-page h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 10px;
}

.qrcode-page .subtitle {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 45px;
}

/* 介绍区域 */
.intro-section {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 50px;
}

.intro-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    display: flex;
    gap: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.intro-icon {
    font-size: 42px;
    flex-shrink: 0;
}

.intro-content h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.intro-content p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 功能特性 */
.qrcode-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    border-color: rgba(99, 102, 241, 0.2);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== 使用教程页面样式 ===== */
.tutorial-page {
    padding: 50px 0 70px;
}

.tutorial-page .container {
    max-width: 900px;
}

.tutorial-page h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 10px;
}

.tutorial-page .subtitle {
    font-size: 14px;
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 40px;
}

/* 视频容器 */
.video-container {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 50px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.video-container video {
    width: 100%;
    height: auto;
    border-radius: 12px;
    max-height: 500px;
}

/* 教程列表 */
.tutorial-list h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    text-align: center;
}

.tutorial-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.tutorial-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    padding: 22px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

.tutorial-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    border-color: rgba(99, 102, 241, 0.2);
}

.tutorial-card .card-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.tutorial-card .card-content {
    flex: 1;
}

.tutorial-card .card-content h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.tutorial-card .card-content p {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 注册/登录页面样式 ===== */
.register-page {
    padding: 60px 0;
    min-height: 70vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.register-form {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.tab-switch {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 8px;
}

.tab-btn:hover {
    background: rgba(99, 102, 241, 0.05);
    color: var(--text-primary);
}

.tab-btn.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.08) 100%);
    color: var(--primary-color);
    font-weight: 600;
}

.tab-content {
    display: none;
}

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

.tab-content h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.tab-content .subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 28px;
}

.form-group.remember {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.form-group.remember label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.form-group.remember input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.forgot-password {
    font-size: 13px;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: var(--primary-light);
}

/* ===== 联系客服页面样式 ===== */
.contact-page {
    padding: 60px 0;
    min-height: 70vh;
}

.page-header {
    text-align: center;
    margin-bottom: 50px;
}

.page-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.page-header p {
    font-size: 14px;
    color: var(--text-muted);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.contact-card {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 35px 28px;
    display: flex;
    align-items: center;
    gap: 18px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.contact-icon {
    font-size: 42px;
    flex-shrink: 0;
}

.contact-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-secondary);
}

.contact-card .hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== 服务条款/隐私政策/版权声明页面样式 ===== */
.terms-page,
.privacy-page,
.copyright-page {
    padding: 60px 0;
    min-height: 70vh;
}

.terms-content,
.privacy-content,
.copyright-content {
    max-width: 900px;
    margin: 0 auto;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 50px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.terms-section,
.privacy-section,
.copyright-section {
    margin-bottom: 35px;
}

.terms-section:last-child,
.privacy-section:last-child,
.copyright-section:last-child {
    margin-bottom: 0;
}

.terms-section h3,
.privacy-section h3,
.copyright-section h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.terms-section p,
.privacy-section p,
.copyright-section p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.terms-section ul,
.privacy-section ul,
.copyright-section ul {
    list-style: none;
    padding-left: 0;
    margin-top: 12px;
}

.terms-section li,
.privacy-section li,
.copyright-section li {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.terms-section li::before,
.privacy-section li::before,
.copyright-section li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 16px;
}

.terms-section strong,
.privacy-section strong,
.copyright-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== 常见问题页面样式 ===== */
.faq-page {
    padding: 60px 0;
    min-height: 70vh;
}

.faq-page .container {
    max-width: 900px;
}

.faq-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.faq-category {
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.faq-category h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.faq-item {
    margin-bottom: 16px;
    border-radius: 12px;
    overflow: hidden;
}

.faq-item:last-child {
    margin-bottom: 0;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: #f8fafc;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 12px;
}

.faq-question:hover {
    background: rgba(99, 102, 241, 0.08);
}

.faq-question::after {
    content: '+';
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.15);
    border-radius: 50%;
    color: var(--primary-color);
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.faq-question.active::after {
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 20px;
    background: #ffffff;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
    border-top: 1px solid var(--border-color);
}

.faq-answer.show {
    display: block;
}

/* 响应式 */
@media (max-width: 900px) {
    .intro-section {
        grid-template-columns: 1fr;
    }
    
    .qrcode-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tutorial-cards {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .qrcode-page {
        padding: 40px 0 50px;
    }
    
    .qrcode-page h2 {
        font-size: 24px;
    }
    
    .intro-card {
        flex-direction: column;
        text-align: center;
    }
    
    .qrcode-features {
        grid-template-columns: 1fr;
    }
    
    .register-form {
        padding: 30px 20px;
    }
    
    .tab-switch {
        gap: 6px;
    }
    
    .tab-btn {
        font-size: 14px;
        padding: 10px;
    }
    
    .contact-card {
        padding: 25px 20px;
        flex-direction: column;
        text-align: center;
    }
    
    .terms-content,
    .privacy-content,
    .copyright-content {
        padding: 30px 20px;
    }
    
    .page-header h2 {
        font-size: 24px;
    }
}