/* 全局样式 */
:root {
    --primary-color: #3073F1;
    --primary-hover: #1E59C9;
    --secondary-color: #6F6F6F;
    --accent-color: #5A89FF;
    --text-color: #1A1A1A;
    --light-text: #646A73;
    --background-color: #FFFFFF;
    --secondary-bg: #F7F9FC;
    --card-background: #FFFFFF;
    --border-radius: 12px;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
    --border-color: #EAEDF3;
}

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

body {
    font-family: "PingFang SC", "SF Pro SC", "SF Pro Text", "Helvetica Neue", -apple-system, BlinkMacSystemFont, Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

h1, h2, h3, h4, h5, h6 {
    margin-bottom: 1rem;
    line-height: 1.4;
    font-weight: 600;
}

p {
    margin-bottom: 1rem;
    color: var(--light-text);
}

section {
    padding: 60px 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
    border: none;
    font-size: 16px;
}

.btn i {
    margin-right: 8px;
}

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

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

.btn-secondary {
    background-color: #F0F4FD;
    color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: #E2E9F8;
    color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

/* 头部导航 */
header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 1px 0 0 var(--border-color);
    padding: 16px 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

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

.logo img {
    height: 32px;
    margin-right: 12px;
}

.logo h1 {
    font-size: 22px;
    font-weight: 600;
    margin: 0;
    color: var(--text-color);
}

nav ul {
    display: flex;
    align-items: center;
}

nav ul li {
    margin-left: 32px;
}

nav ul li a {
    color: var(--light-text);
    font-weight: 500;
    font-size: 15px;
    padding: 8px 0;
    position: relative;
}

nav ul li a:hover {
    color: var(--primary-color);
}

nav ul li a:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

nav ul li a:hover:after {
    width: 100%;
}

/* 英雄区 */
.hero {
    padding: 80px 0 100px;
    background-color: var(--background-color);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(48, 115, 241, 0.03) 0%, rgba(207, 220, 255, 0.1) 100%);
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    max-width: 550px;
    padding-right: 40px;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-color);
    line-height: 1.2;
}

.hero-content .tagline {
    font-size: 22px;
    color: var(--light-text);
    margin-bottom: 32px;
    line-height: 1.5;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    margin-top: 30px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    position: relative;
}

.hero-image img {
    max-width: 360px;
    border-radius: 16px;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

/* 功能区 */
.features {
    background-color: var(--secondary-bg);
    text-align: center;
    padding: 80px 0;
}

.features h2 {
    font-size: 36px;
    margin-bottom: 24px;
    color: var(--text-color);
}

.features-subtitle {
    font-size: 18px;
    color: var(--light-text);
    max-width: 700px;
    margin: 0 auto 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 40px 24px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    text-align: left;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
    border-color: #D1DEFA;
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 16px;
    color: var(--text-color);
}

.feature-card p {
    color: var(--light-text);
    font-size: 16px;
    line-height: 1.6;
}

/* 截图区 */
.screenshots {
    background-color: var(--background-color);
    text-align: center;
    padding: 80px 0;
}

.screenshots h2 {
    font-size: 36px;
    margin-bottom: 24px;
}

.screenshots-subtitle {
    font-size: 18px;
    color: var(--light-text);
    max-width: 700px;
    margin: 0 auto 60px;
}

.screenshot-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    padding: 0 20px;
}

.screenshot {
    padding: 15px;
    transition: var(--transition);
}

.screenshot img {
    height: auto;
    max-height: 500px;
    width: auto;
    border-radius: 14px;
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.screenshot:hover img {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 下载区 */
.download {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    text-align: center;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='rgba(255,255,255,.075)' fill-rule='evenodd'/%3E%3C/svg%3E");
    opacity: 0.3;
}

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

.download h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: white;
}

.download p {
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    color: rgba(255, 255, 255, 0.9);
}

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

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

.download .btn-primary:hover {
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--primary-hover);
}

.download .btn-secondary {
    background-color: rgba(255, 255, 255, 0.15);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.download .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.25);
    color: white;
}

/* 关于我们 */
.about {
    background-color: var(--background-color);
    padding: 80px 0;
}

.about h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-color);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.company-info {
    margin-bottom: 20px;
    padding: 30px;
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

.company-info h3 {
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--primary-color);
}

.company-info p {
    margin-bottom: 16px;
    display: flex;
    align-items: flex-start;
    color: var(--light-text);
}

.company-info i {
    color: var(--primary-color);
    margin-right: 12px;
    margin-top: 5px;
    font-size: 18px;
}

.company-description {
    padding: 30px;
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid var(--border-color);
}

.company-description p {
    margin-bottom: 20px;
    text-align: justify;
    color: var(--light-text);
    line-height: 1.8;
}

/* 页脚 */
footer {
    background-color: var(--secondary-bg);
    color: var(--light-text);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 50px;
}

.footer-column {
    flex: 1;
    min-width: 200px;
    margin-bottom: 30px;
}

.footer-column h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-color);
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul li a {
    color: var(--light-text);
    font-size: 15px;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--light-text);
    font-size: 14px;
    margin-bottom: 0;
}

.footer-bottom a {
    color: var(--primary-color);
}

/* 法律页面样式 */
.legal-content {
    padding: 60px 0;
    background-color: var(--background-color);
}

.legal-box {
    background-color: var(--card-background);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-top: 20px;
    border: 1px solid var(--border-color);
}

.legal-content h2 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-color);
    font-size: 32px;
}

.legal-content h3 {
    margin: 30px 0 15px;
    color: var(--text-color);
    font-size: 20px;
    font-weight: 600;
}

.legal-content p, .legal-content li {
    margin-bottom: 15px;
    line-height: 1.8;
    color: var(--light-text);
}

.legal-content ul {
    padding-left: 20px;
    margin-bottom: 20px;
}

.legal-content li {
    list-style-type: disc;
    margin-left: 15px;
    padding-left: 10px;
}

.summary-block {
    margin-bottom: 30px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
}

.summary-block:last-child {
    border-bottom: none;
}

.summary-list {
    padding-left: 0;
}

.summary-list li {
    list-style-type: none;
    padding: 10px 0 10px 20px;
    margin-left: 0;
    border-left: 3px solid var(--primary-color);
    background-color: #F7F9FC;
    border-radius: 0 8px 8px 0;
    margin-bottom: 10px;
}

/* 用户协议页面额外样式 */
.agreement-intro {
    background-color: #f7f9fc;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    border-left: 4px solid var(--primary-color);
}

.agreement-intro p {
    margin-bottom: 15px;
}

.agreement-intro p:last-child {
    margin-bottom: 0;
}

.legal-box ol {
    counter-reset: item;
    padding-left: 20px;
    margin-bottom: 20px;
}

.legal-box ol li {
    display: block;
    margin-bottom: 12px;
    line-height: 1.7;
    color: var(--light-text);
    position: relative;
    padding-left: 10px;
}

.legal-box ol li:before {
    content: counter(item) ". ";
    counter-increment: item;
    color: var(--primary-color);
    font-weight: 600;
    position: absolute;
    left: -20px;
}

.legal-box ol ol {
    margin-top: 15px;
    margin-bottom: 10px;
    padding-left: 5px;
}

.legal-box ol ol li {
    color: var(--light-text);
    margin-bottom: 8px;
}

.legal-box ol ol li:before {
    content: counter(item, lower-alpha) ". ";
    left: -25px;
}

.legal-box h3 {
    color: var(--primary-color);
    margin-top: 40px;
    font-weight: 600;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.legal-box > p {
    font-size: 14px;
    color: #9EA4AC;
    text-align: right;
    margin-bottom: 30px;
}

/* 隐私政策表格样式 */
.legal-box table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
}

.legal-box table th {
    background-color: #f0f4fd;
    color: var(--primary-color);
    font-weight: 600;
    text-align: left;
    padding: 12px;
    border: 1px solid #e0e7f5;
}

.legal-box table td {
    padding: 10px 12px;
    border: 1px solid #e0e7f5;
    vertical-align: top;
    color: var(--light-text);
}

.legal-box table tr:nth-child(even) {
    background-color: #f9fafc;
}

.legal-box table tr:hover {
    background-color: #f0f4fd;
}

/* 隐私政策增强样式 */
.legal-box ul {
    list-style-type: disc;
    padding-left: 25px;
    margin-bottom: 15px;
}

.legal-box ul li {
    margin-bottom: 8px;
    line-height: 1.7;
    color: var(--light-text);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero {
        padding: 60px 0;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        margin-bottom: 50px;
        padding-right: 0;
        max-width: 100%;
    }
    
    .hero-content h1 {
        font-size: 40px;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .hero-image {
        justify-content: center;
    }
    
    section {
        padding: 60px 0;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    .logo {
        margin-bottom: 20px;
    }
    
    nav ul {
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 15px;
    }
    
    .hero-content h1 {
        font-size: 36px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .about-content {
        flex-direction: column;
    }
    
    .legal-box {
        padding: 25px;
    }
    
    .agreement-intro {
        padding: 15px;
    }
    
    .legal-box ol {
        padding-left: 15px;
    }
    
    .legal-box ol li {
        padding-left: 5px;
    }
    
    .legal-box table {
        font-size: 12px;
    }
    
    .legal-box table th,
    .legal-box table td {
        padding: 8px;
    }
}

@media (max-width: 576px) {
    .hero-content h1 {
        font-size: 32px;
    }
    
    .hero-content .tagline {
        font-size: 18px;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .screenshot img {
        height: auto;
        max-height: 400px;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    section {
        padding: 50px 0;
    }
    
    .legal-box {
        padding: 20px;
    }
    
    .legal-box table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}