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

:root {
    --primary-color: #e74c3c;
    --primary-dark: #c0392b;
    --secondary-color: #2c3e50;
    --text-color: #333;
    --text-light: #666;
    --text-muted: #999;
    --bg-light: #f8f9fa;
    --bg-white: #fff;
    --border-color: #eee;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 24px;
    font-weight: 700;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-light);
}

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

.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #fff5f5 0%, #fff 50%, #f0f9ff 100%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), #e67e22);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 12px;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.section-subtitle {
    font-size: 18px;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 60px;
}

.features {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    padding: 40px 32px;
    background-color: var(--bg-light);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-white);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.feature-desc {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
}

.scenarios {
    padding: 100px 0;
    background-color: var(--bg-light);
}

.scenarios-list {
    max-width: 900px;
    margin: 0 auto;
}

.scenario-item {
    display: flex;
    gap: 32px;
    padding: 40px;
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    transition: var(--transition);
}

.scenario-item:hover {
    box-shadow: var(--shadow-md);
}

.scenario-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-color);
    opacity: 0.3;
    line-height: 1;
}

.scenario-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--secondary-color);
}

.scenario-content p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
}

.download {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.download-content {
    text-align: center;
    color: var(--bg-white);
}

.download-content h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
}

.download-content p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 28px;
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    color: var(--text-color);
    transition: var(--transition);
}

.download-btn:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.download-btn-icon {
    font-size: 32px;
}

.download-btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.download-btn-text small {
    font-size: 12px;
    color: var(--text-muted);
}

.download-btn-text strong {
    font-size: 16px;
}

.footer {
    padding: 80px 0 40px;
    background-color: var(--secondary-color);
    color: var(--bg-white);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 60px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo-text {
    color: var(--bg-white);
}

.footer-brand p {
    font-size: 14px;
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-section a {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
}

.footer-section a:hover {
    color: var(--bg-white);
}

.footer-company {
    padding: 32px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 40px;
}

.company-info-compact {
    text-align: center;
}

.company-row {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 8px;
    line-height: 1.8;
}

.company-row:last-child {
    margin-bottom: 0;
}

.company-label-compact {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

.company-value-compact {
    margin-right: 4px;
}

.company-divider {
    margin: 0 12px;
    color: rgba(255, 255, 255, 0.3);
}

.contact-row {
    margin-top: 8px;
}

.contact-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.contact-link:hover {
    color: var(--bg-white);
    text-decoration: underline;
}

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

.footer-bottom p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 8px;
}

/* 模态框样式 */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 20px;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
}

.modal-container {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 800px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

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

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    font-size: 24px;
    color: var(--text-light);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover {
    background-color: var(--bg-light);
    color: var(--text-color);
}

.modal-content {
    padding: 24px;
    overflow-y: auto;
    line-height: 1.8;
    color: var(--text-color);
}

.modal-content h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--secondary-color);
    margin: 24px 0 12px;
}

.modal-content h4:first-child {
    margin-top: 0;
}

.modal-content p {
    margin-bottom: 12px;
    font-size: 14px;
}

.modal-content ol,
.modal-content ul {
    margin: 12px 0;
    padding-left: 24px;
}

.modal-content li {
    margin-bottom: 8px;
    font-size: 14px;
}

.modal-content .article {
    margin-bottom: 20px;
}

.modal-content .article-title {
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        gap: 48px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    .nav {
        height: 64px;
    }
    
    .nav-links {
        display: none;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .hero-desc {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
        padding: 0 20px;
    }
    
    .btn {
        width: 100%;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-subtitle {
        font-size: 16px;
        margin-bottom: 40px;
    }
    
    .features {
        padding: 60px 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-card {
        padding: 32px 24px;
    }
    
    .scenarios {
        padding: 60px 0;
    }
    
    .scenario-item {
        flex-direction: column;
        gap: 16px;
        padding: 24px;
    }
    
    .scenario-number {
        font-size: 32px;
    }
    
    .download {
        padding: 60px 0;
    }
    
    .download-content h2 {
        font-size: 28px;
    }
    
    .download-buttons {
        flex-direction: column;
        padding: 0 20px;
    }
    
    .download-btn {
        justify-content: center;
    }
    
    .footer {
        padding: 60px 0 32px;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: 32px;
    }
    
    .footer-section {
        min-width: 120px;
    }
    
    .footer-company {
        padding: 24px 0;
    }
    
    .company-row {
        font-size: 12px;
        line-height: 1.6;
    }
    
    .company-divider {
        margin: 0 8px;
    }
    
    .modal-container {
        max-height: 90vh;
        margin: 10px;
    }
    
    .modal-header {
        padding: 16px 20px;
    }
    
    .modal-content {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 24px;
    }
    
    .feature-icon {
        font-size: 36px;
    }
    
    .footer-links {
        gap: 24px;
    }
    
    .company-row {
        display: flex;
        flex-direction: column;
        gap: 4px;
        margin-bottom: 16px;
    }
    
    .company-divider {
        display: none;
    }
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.lang-switcher {
    display: flex;
    gap: 4px;
    background-color: var(--bg-light);
    border-radius: var(--radius-sm);
    padding: 4px;
}

.lang-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    color: var(--text-color);
}

.lang-btn.active {
    background-color: var(--bg-white);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .nav-right {
        gap: 12px;
    }
    
    .lang-switcher {
        position: fixed;
        top: 16px;
        right: 70px;
        z-index: 1001;
    }
}

@media (max-width: 480px) {
    .lang-switcher {
        right: 16px;
    }
    
    .lang-btn {
        padding: 4px 8px;
        font-size: 12px;
    }
}