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

body {
    font-family: 'Noto Sans SC', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    overflow-x: hidden;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

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

.logo i {
    font-size: 24px;
    color: #4096ff;
}

.logo h1 {
    color: #2c3e50;
    font-size: 24px;
    font-weight: 700;
    margin: 0;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
    transition: all 0.3s ease;
}

.nav-links a {
    text-decoration: none;
    color: #34495e;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: #4096ff;
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
    color: #4096ff;
}

.mobile-menu {
    display: none;
    font-size: 24px;
    cursor: pointer;
    color: #34495e;
    z-index: 1001;
}

/* 移动端菜单样式 */
@media (max-width: 992px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        width: 100%;
        padding: 20px 0;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        transition: all 0.3s ease;
        z-index: 999;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-links a {
        padding: 15px 20px;
        font-size: 18px;
        width: 100%;
        text-align: center;
    }
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, #4096ff 0%, #096dd9 100%);
    color: #fff;
    box-shadow: 0 4px 12px rgba(64, 150, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(64, 150, 255, 0.4);
}

.btn-secondary {
    background-color: #ecf0f1;
    color: #34495e;
    border: 2px solid #bdc3c7;
}

.btn-secondary:hover {
    background-color: #bdc3c7;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-lg {
    padding: 15px 30px;
    font-size: 18px;
}

.btn-xl {
    padding: 18px 36px;
    font-size: 20px;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

/* 页面标题 */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 120px 0 60px;
    text-align: center;
    margin-bottom: 60px;
}

.page-header h1 {
    font-size: 48px;
    margin-bottom: 15px;
    font-weight: 700;
    letter-spacing: -1px;
}

.page-header p {
    font-size: 20px;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 120px 0 80px;
    overflow: hidden;
    position: relative;
}

.hero::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 1440 320"><path fill="rgba(255,255,255,0.1)" fill-opacity="1" d="M0,256L60,234.7C120,213,240,171,360,170.7C480,171,600,213,720,224C840,235,960,213,1080,202.7C1200,192,1320,192,1380,192L1440,192L1440,320L1380,320C1320,320,1200,320,1080,320C960,320,840,320,720,320C600,320,480,320,360,320C240,320,120,320,60,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
    opacity: 0.3;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h2 {
    font-size: 52px;
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -1px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.hero-meta {
    display: flex;
    gap: 30px;
    font-size: 14px;
    opacity: 0.8;
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-preview {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    width: 100%;
    max-width: 400px;
    animation: float 3s ease-in-out infinite;
}

/* 移动端英雄区域优化 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }
    
    .hero-content {
        order: 2;
        max-width: 100%;
    }
    
    .hero-image {
        order: 1;
    }
    
    .hero h2 {
        font-size: 42px;
        line-height: 1.3;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-meta {
        justify-content: center;
    }
    
    .app-preview {
        max-width: 350px;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero h2 {
        font-size: 36px;
    }
    
    .hero p {
        font-size: 18px;
        margin-bottom: 30px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .app-preview {
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 80px 0 50px;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .app-preview {
        max-width: 250px;
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.app-header {
    background-color: #f5f5f7;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #e0e0e0;
}

.app-title {
    font-weight: 600;
    color: #333;
}

.app-controls {
    display: flex;
    gap: 8px;
    color: #666;
}

.app-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.app-nav {
    display: flex;
    justify-content: space-around;
    padding: 10px;
    background-color: #f5f5f7;
    border-radius: 8px;
    color: #666;
}

.app-nav i {
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.app-nav i.active,
.app-nav i:hover {
    color: #4096ff;
}

.app-main {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.calendar-preview {
    height: 180px;
    background: linear-gradient(135deg, #4096ff 0%, #096dd9 100%);
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.plans-preview {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.plans-preview::before {
    content: '';
    height: 120px;
    background: linear-gradient(to bottom, #ecf0f1, #f8f9fa);
    border-radius: 8px;
    opacity: 0.8;
}

/* 核心功能 */
.core-features {
    padding: 80px 0;
    background-color: #fff;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 42px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 700;
}

.section-header p {
    font-size: 18px;
    color: #7f8c8d;
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: #f8f9fa;
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, #4096ff 0%, #096dd9 100%);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: #4096ff;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #4096ff 0%, #096dd9 100%);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 25px;
    font-size: 32px;
    color: #fff;
    box-shadow: 0 4px 12px rgba(64, 150, 255, 0.3);
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
}

.feature-card p {
    color: #7f8c8d;
    line-height: 1.6;
    font-size: 15px;
}

/* 移动端核心功能优化 */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 25px;
    }
    
    .feature-card {
        padding: 35px 25px;
    }
}

@media (max-width: 768px) {
    .core-features {
        padding: 60px 0;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .section-header p {
        font-size: 16px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .feature-card h3 {
        font-size: 22px;
    }
    
    .feature-card p {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .core-features {
        padding: 50px 0;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .feature-icon {
        width: 70px;
        height: 70px;
        font-size: 28px;
        margin-bottom: 20px;
    }
    
    .feature-card h3 {
        font-size: 20px;
        margin-bottom: 12px;
    }
}

/* 产品优势 */
.advantages {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.advantage-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.advantage-number {
    font-size: 48px;
    font-weight: 700;
    color: #4096ff;
    opacity: 0.1;
    line-height: 1;
    min-width: 60px;
}

.advantage-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #2c3e50;
    font-weight: 600;
}

.advantage-content p {
    color: #7f8c8d;
    line-height: 1.6;
}

/* 下载区域 */
.download-section {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: #fff;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-section::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 1440 320"><path fill="rgba(255,255,255,0.1)" fill-opacity="1" d="M0,256L60,234.7C120,213,240,171,360,170.7C480,171,600,213,720,224C840,235,960,213,1080,202.7C1200,192,1320,192,1380,192L1440,192L1440,320L1380,320C1320,320,1200,320,1080,320C960,320,840,320,720,320C600,320,480,320,360,320C240,320,120,320,60,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
    opacity: 0.3;
}

.download-content {
    position: relative;
    z-index: 1;
}

.download-content h2 {
    font-size: 42px;
    margin-bottom: 20px;
    font-weight: 700;
}

.download-content p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.download-note {
    margin-top: 30px;
    font-size: 14px;
    opacity: 0.8;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

/* 功能导航 */
.features-nav {
    background-color: #fff;
    padding: 30px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    margin-bottom: 60px;
}

.features-nav-list {
    display: flex;
    list-style: none;
    gap: 10px;
    overflow-x: auto;
    padding: 10px 0;
    justify-content: center;
    flex-wrap: wrap;
}

.features-nav-list li a {
    text-decoration: none;
    color: #34495e;
    padding: 10px 20px;
    border-radius: 25px;
    background-color: #f5f5f7;
    font-size: 14px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.features-nav-list li a:hover {
    background-color: #e6f0ff;
    color: #4096ff;
    transform: translateY(-2px);
}

/* 功能详情 */
.feature-section {
    padding: 80px 0;
    background-color: #fff;
}

.feature-section-alt {
    background-color: #f8f9fa;
}

.feature-content {
    display: flex;
    gap: 60px;
    align-items: center;
    flex-wrap: wrap;
}

.feature-text {
    flex: 1;
    min-width: 300px;
}

.feature-text h2 {
    font-size: 42px;
    margin-bottom: 25px;
    color: #2c3e50;
    font-weight: 700;
}

.feature-text p {
    font-size: 18px;
    margin-bottom: 30px;
    color: #7f8c8d;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    color: #34495e;
    font-size: 16px;
    line-height: 1.6;
}

.feature-list i {
    color: #52c41a;
    font-size: 20px;
    margin-top: 2px;
    flex-shrink: 0;
}

.feature-image {
    flex: 1;
    min-width: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.feature-icon-large {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, #4096ff 0%, #096dd9 100%);
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 64px;
    color: #fff;
    box-shadow: 0 10px 30px rgba(64, 150, 255, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

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

/* 下载选项 */
.download-options {
    padding: 80px 0;
    background-color: #fff;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
    justify-content: center;
}

.download-card {
    background-color: #f8f9fa;
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
}

.download-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    border-color: #4096ff;
}

.download-header {
    text-align: center;
    margin-bottom: 30px;
}

.download-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 20px;
    border-radius: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 48px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.download-icon.windows {
    background: linear-gradient(135deg, #0078d4 0%, #005a9e 100%);
    color: #fff;
}

.download-header h2 {
    font-size: 32px;
    margin-bottom: 10px;
    color: #2c3e50;
    font-weight: 600;
}

.download-header p {
    color: #7f8c8d;
    font-size: 16px;
}

.download-info {
    background-color: #fff;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 30px;
    border: 1px solid #e0e0e0;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 15px;
    color: #34495e;
}

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

.info-item i {
    color: #4096ff;
    font-size: 18px;
    width: 20px;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.download-requirements {
    background-color: #e8f4f8;
    border-radius: 12px;
    padding: 25px;
    border-left: 4px solid #4096ff;
}

.download-requirements h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
}

.download-requirements ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.download-requirements li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #555;
    font-size: 14px;
}

.download-requirements i {
    color: #52c41a;
    font-size: 16px;
}

/* 下载说明 */
.download-instructions {
    padding: 80px 0;
    background-color: #f8f9fa;
}

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

.instruction-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 25px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    border-left: 4px solid #4096ff;
}

.instruction-item h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
}

.instruction-item p {
    color: #555;
    line-height: 1.6;
    font-size: 15px;
}

.instruction-item a {
    color: #4096ff;
    text-decoration: none;
}

.instruction-item a:hover {
    text-decoration: underline;
}

/* 安装步骤 */
.installation-steps {
    padding: 80px 0;
    background-color: #fff;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.step-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.step-number {
    font-size: 48px;
    font-weight: 700;
    color: #4096ff;
    opacity: 0.1;
    line-height: 1;
    min-width: 60px;
}

.step-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: #2c3e50;
    font-weight: 600;
}

.step-content p {
    color: #7f8c8d;
    line-height: 1.6;
    font-size: 15px;
}

/* 常见问题 */
.faq {
    padding: 80px 0;
    background-color: #f8f9fa;
}

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

.faq-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
}

.faq-item p {
    color: #555;
    line-height: 1.6;
    font-size: 15px;
}

/* 版本日志 */
.changelog-content {
    padding: 80px 0;
    background-color: #fff;
}

.changelog-list {
    max-width: 1000px;
    margin: 0 auto;
}

.version-item {
    background-color: #f8f9fa;
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 30px;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.version-item:hover {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-color: #4096ff;
}

.version-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 20px;
}

.version-info h2 {
    font-size: 32px;
    margin-bottom: 5px;
    color: #2c3e50;
    font-weight: 600;
}

.release-date {
    color: #7f8c8d;
    font-size: 14px;
}

.version-status {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.version-status.beta {
    background-color: #fff2cc;
    color: #d48806;
    border: 1px solid #ffeaa7;
}

.version-status.stable {
    background-color: #f6ffed;
    color: #52c41a;
    border: 1px solid #b7eb8f;
}

.version-changes h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #2c3e50;
    font-weight: 600;
}

.version-changes ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.version-changes li {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    color: #34495e;
    font-size: 15px;
    line-height: 1.6;
}

.version-changes i {
    color: #52c41a;
    font-size: 18px;
    margin-top: 2px;
    flex-shrink: 0;
    width: 20px;
}

/* 联系方式 */
.contact-info {
    padding: 80px 0;
    background-color: #fff;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.contact-item {
    background-color: #f8f9fa;
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
}

.contact-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: #4096ff;
}

.contact-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #4096ff 0%, #096dd9 100%);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 25px;
    font-size: 48px;
    color: #fff;
    box-shadow: 0 4px 12px rgba(64, 150, 255, 0.3);
}

.contact-item h2 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #2c3e50;
    font-weight: 600;
}

.contact-item p {
    color: #7f8c8d;
    line-height: 1.6;
    margin-bottom: 30px;
    font-size: 15px;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background-color: #4096ff;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.contact-link:hover {
    background-color: #096dd9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(64, 150, 255, 0.3);
}

/* 反馈表单 */
.feedback-form {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.form {
    max-width: 700px;
    margin: 0 auto;
    background-color: #fff;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: #2c3e50;
    font-weight: 600;
    font-size: 16px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: #fff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4096ff;
    box-shadow: 0 0 0 3px rgba(64, 150, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

/* 下载CTA */
.download-cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 80px 0;
    text-align: center;
}

.download-cta h2 {
    font-size: 36px;
    margin-bottom: 20px;
    font-weight: 700;
}

.download-cta p {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 产品优势移动端优化 */
@media (max-width: 768px) {
    .advantages {
        padding: 60px 0;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .advantage-item {
        flex-direction: column;
        text-align: center;
        align-items: center;
        gap: 15px;
    }
    
    .advantage-number {
        font-size: 42px;
    }
}

@media (max-width: 480px) {
    .advantages {
        padding: 50px 0;
    }
    
    .advantage-content h3 {
        font-size: 18px;
    }
}

/* 页脚 */
.footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 80px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.footer-logo i {
    font-size: 32px;
    color: #4096ff;
}

.footer-logo h3 {
    font-size: 24px;
    margin-bottom: 0;
    color: #4096ff;
    font-weight: 700;
}

.footer-logo p {
    color: #bdc3c7;
    line-height: 1.6;
    font-size: 15px;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #ecf0f1;
    font-weight: 600;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 15px;
}

.footer-links a:hover {
    color: #4096ff;
}

.footer-contact p {
    color: #bdc3c7;
    margin-bottom: 15px;
    line-height: 1.6;
    font-size: 15px;
}

.footer-contact a {
    color: #4096ff;
    text-decoration: none;
}

.footer-contact a:hover {
    text-decoration: underline;
}

.footer-contact i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #34495e;
    color: #95a5a6;
    font-size: 14px;
}

/* 页脚移动端优化 */
@media (max-width: 768px) {
    .footer {
        padding: 60px 0 25px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
    
    .footer-logo {
        align-items: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 50px 0 20px;
    }
    
    .footer-content {
        gap: 25px;
        margin-bottom: 30px;
    }
    
    .footer-logo h3 {
        font-size: 22px;
    }
    
    .footer-links h4,
    .footer-contact h4 {
        font-size: 16px;
        margin-bottom: 15px;
    }
    
    .footer-bottom {
        padding-top: 20px;
        font-size: 13px;
    }
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero .container {
        gap: 40px;
    }
    
    .hero h2 {
        font-size: 42px;
    }
    
    .feature-content {
        gap: 40px;
    }
}

@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-meta {
        justify-content: center;
    }
    
    .feature-content {
        flex-direction: column;
        text-align: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 25px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .version-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    .page-header h1 {
        font-size: 36px;
    }
    
    .page-header p {
        font-size: 18px;
    }
    
    .hero h2 {
        font-size: 36px;
    }
    
    .hero p {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-lg {
        font-size: 16px;
        padding: 12px 25px;
    }
    
    .section-header h2 {
        font-size: 32px;
    }
    
    .section-header p {
        font-size: 16px;
    }
    
    .features-nav-list {
        justify-content: flex-start;
    }
    
    .download-content h2 {
        font-size: 36px;
    }
    
    .download-content p {
        font-size: 18px;
    }
    
    .download-card {
        padding: 30px;
    }
    
    .version-item {
        padding: 30px;
    }
    
    .version-info h2 {
        font-size: 24px;
    }
    
    .form {
        padding: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 20px;
    }
    
    .page-header {
        padding: 100px 0 40px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .feature-card h3 {
        font-size: 20px;
    }
    
    .download-content h2 {
        font-size: 32px;
    }
    
    .download-note {
        flex-direction: column;
        gap: 5px;
    }
    
    .download-card {
        padding: 25px;
    }
    
    .download-header h2 {
        font-size: 24px;
    }
    
    .info-item {
        font-size: 14px;
    }
    
    .version-item {
        padding: 25px;
    }
    
    .form {
        padding: 25px;
    }
    
    .footer {
        padding: 60px 0 20px;
    }
}