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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
}

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

/* ==================== 导航栏 ==================== */
.header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: transparent;
    z-index: 1000;
    padding: 20px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: white;
}

.logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: white;
    font-size: 15px;
    transition: opacity 0.3s;
    opacity: 0.9;
}

.nav a:hover {
    opacity: 1;
}

/* ==================== 英雄区 ==================== */
.hero {
    margin-top: 0;
    padding: 140px 0 0;
    background: url('static/top.png') center top/cover no-repeat;
    color: white;
    text-align: center;
    position: relative;
    min-height: 1198PX;
}

.hero .container {
    position: relative;
    z-index: 1;
    top: 80px;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 36px;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 18px;
    font-weight: 400;
    margin-bottom: 30px;
    opacity: 0.95;
}

/* 下载按钮 */
.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 30px;
    background: white;
    color: #333;
    text-decoration: none;
    border-radius: 25px;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn-download img {
    width: 20px;
    height: 20px;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn-android {
    background: white;
      color: #667eea;
}

.btn-ios {
    background: white;
    color: #667eea;
}

/* 二维码 */
.qr-code {
    display: inline-block;
    margin-top: 40px;
}

.qr-code img {
    width: 140px;
    height: 140px;
    background: white;
    padding: 12px;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.qr-code p {
    margin-top: 15px;
    font-size: 15px;
    opacity: 0.95;
    font-weight: 500;
}

/* ==================== 核心功能区 ==================== */
.core-features {
    padding: 100px 0;
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 60px;
    color: #1a1a1a;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon img {
    width: 50px;
    height: 50px;
    filter: brightness(0) invert(1);
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.feature-card p {
    font-size: 15px;
    color: #666;
    line-height: 1.8;
}

/* ==================== 功能介绍区 ==================== */
.feature-section {
    padding: 100px 0;
}

.feature-section:nth-child(even) {
    background: #f8f9fa;
}

.feature-content {
    display: flex;
    align-items: center;
    gap: 80px;
}

.feature-content.reverse {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-text h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 30px;
    color: #1a1a1a;
    line-height: 1.3;
}

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

.feature-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 18px;
    font-size: 16px;
    color: #555;
    line-height: 1.6;
}

.feature-list img {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    flex-shrink: 0;
}

.feature-image {
    flex: 1;
}

.feature-image img {
    max-width: 100%;
    height: auto;
    /* border-radius: 16px; */
    /* box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1); */
}

/* ==================== 平台支持区 ==================== */
.platform-section {
    padding: 100px 0;
    background: white;
}

.platform-content {
    display: flex;
    align-items: center;
    gap: 80px;
}

.platform-text {
    flex: 1;
}

.platform-icons {
    flex: 1;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.platform-item {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s;
}

.platform-item:hover {
    border-color: #667eea;
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.2);
}

.platform-icon {
    font-size: 32px;
    font-weight: 700;
    color: #667eea;
}

.platform-icon.google {
    color: #4285F4;
}

.platform-icon.dropbox {
    color: #0061FF;
}

.platform-icon.onedrive {
    color: #0078D4;
}

.platform-icon.notion {
    color: #000;
}

.platform-icon.github {
    color: #333;
}

.platform-more {
    text-align: center;
    color: #999;
    font-size: 14px;
}

/* ==================== 页尾 ==================== */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 80px 0 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('static/foot_bg.png') center/cover;
    opacity: 0.05;
    z-index: 0;
}

.footer .container {
    position: relative;
    z-index: 1;
}

.footer-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-subtitle {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.footer-download {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.footer-qr {
    margin-bottom: 40px;
}

.footer-qr img {
    width: 120px;
    height: 120px;
    background: white;
    padding: 10px;
    border-radius: 12px;
}

.footer-info {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
    font-size: 14px;
}

.footer-info p {
    margin: 8px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.footer-info img {
    width: 16px;
    height: 16px;
}

.footer-info a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.footer-info a:hover {
    opacity: 1;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    .feature-content {
        gap: 50px;
    }
    
    .platform-content {
        gap: 50px;
    }
}

@media (max-width: 768px) {
    /* 导航栏 */
    .header {
        padding: 15px 0;
    }
    
    .nav {
        gap: 15px;
    }
    
    .nav a {
        font-size: 14px;
    }
    
    /* 英雄区 */
    .hero {
        padding: 120px 0 60px;
        min-height: 380px;
        background-size: contain;
        background-position: center top;
    }
    
    .hero .container {
        top: 80px;
        padding: 0 20px;
                 color: #667eea;
    }
    
    .hero-title {
        font-size: 32px;
        margin-bottom: 15px;
    }
    
    .hero-subtitle {
        font-size: 15px;
        margin-bottom: 30px;
        line-height: 1.5;
    }
    
    /* 下载按钮 */
    .download-buttons {
        flex-direction: column;
        gap: 12px;
        align-items: center;
    }
    
    .btn-download {
        width: auto;
        min-width: 200px;
        max-width: 240px;
        justify-content: center;
        padding: 12px 24px;
    }
    
    /* 核心功能 */
    .core-features {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 32px;
        margin-bottom: 40px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    /* 功能介绍区 */
    .feature-section {
        padding: 60px 0;
    }
    
    .feature-content {
        flex-direction: column;
        gap: 30px;
    }
    
    .feature-content.reverse {
        flex-direction: column;
    }
    
    .feature-text h2 {
        font-size: 28px;
        margin-bottom: 20px;
    }
    
    .feature-list li {
        font-size: 15px;
        margin-bottom: 15px;
    }
    
    /* 平台支持区 */
    .platform-section {
        padding: 60px 0;
    }
    
    .platform-content {
        flex-direction: column;
        gap: 30px;
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 页尾 */
    .footer {
        padding: 60px 0 40px;
    }
    
    .footer-title {
        font-size: 32px;
    }
    
    .footer-download {
        flex-direction: column;
        gap: 15px;
    }
    
    .footer-download .btn-download {
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    /* 导航栏 */
    .header {
        padding: 12px 0;
    }
    
    .logo {
        font-size: 16px;
    }
    
    .logo img {
        width: 28px;
        height: 28px;
    }
    
    .logo span {
        display: none;
    }
    
    .nav {
        gap: 12px;
    }
    
    .nav a {
        font-size: 13px;
    }
    
    /* 英雄区 */
    .hero {
        padding: 100px 0 50px;
        min-height: 400px;
        background-size: contain;
        background-position: center top;
    }
    
    .hero .container {
        top: 80px;
        padding: 0 20px;
                color: #667eea;
    }
    
    .hero-title {
        font-size: 26px;
        margin-bottom: 12px;
        letter-spacing: 0;
    
    }
    
    .hero-subtitle {
        font-size: 13px;
        margin-bottom: 25px;
        line-height: 1.6;
        padding: 0 10px;
    }
    
    .download-buttons {
        gap: 10px;
    }
    
    .btn-download {
        padding: 11px 20px;
        font-size: 14px;
        width: auto;
        min-width: 180px;
        max-width: 220px;
    }
    
    .btn-download img {
        width: 18px;
        height: 18px;
    }
    
    /* 核心功能 */
    .core-features {
        padding: 50px 0;
    }
    
    .section-title {
        font-size: 26px;
        margin-bottom: 30px;
    }
    
    .feature-card {
        padding: 25px 15px;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        margin-bottom: 20px;
    }
    
    .feature-icon img {
        width: 35px;
        height: 35px;
    }
    
    .feature-card h3 {
        font-size: 18px;
        margin-bottom: 12px;
    }
    
    .feature-card p {
        font-size: 14px;
    }
    
    /* 功能介绍区 */
    .feature-section {
        padding: 50px 0;
    }
    
    .feature-text h2 {
        font-size: 22px;
        margin-bottom: 18px;
        line-height: 1.4;
    }
    
    .feature-list li {
        font-size: 14px;
        margin-bottom: 12px;
        line-height: 1.6;
    }
    
    .feature-list img {
        width: 16px;
        height: 16px;
    }
    
    /* 平台支持区 */
    .platform-section {
        padding: 50px 0;
    }
    
    .platform-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .platform-item {
        padding: 15px;
    }
    
    .platform-icon {
        font-size: 20px;
    }
    
    /* 页尾 */
    .footer {
        padding: 50px 0 30px;
    }
    
    .footer-title {
        font-size: 26px;
    }
    
    .footer-subtitle {
        font-size: 14px;
        margin-bottom: 25px;
    }
    
    .footer-qr img {
        width: 120px;
        height: 120px;
    }
    
    .footer-info {
        font-size: 12px;
    }
    
    .footer-info img {
        width: 14px;
        height: 14px;
    }
}