/* 全局样式 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-text: #f4f4f4;
    --dark-bg: #2c3e50;
    --light-bg: #ecf0f1;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.5rem;
    color: var(--dark-bg);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary-color);
    margin: 10px auto;
}

.section-desc {
    text-align: center;
    margin-bottom: 50px;
    font-size: 1.2rem;
    color: #666;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    margin-left: 15px;
}

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

.btn-download {
    background-color: var(--dark-bg);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    margin-top: 15px;
    display: inline-block;
}

.btn-download:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

/* 导航栏 */
header {
    background-color: white;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    list-style: none;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1.1rem;
    transition: var(--transition);
}

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

.burger {
    display: none;
    cursor: pointer;
}

.burger div {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px;
    transition: var(--transition);
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #3498db, #8e44ad);
    color: white;
    padding: 150px 0 100px;
    overflow: hidden;
}

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

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

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-content h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    font-weight: 400;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-buttons {
    margin-top: 30px;
}

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

.hero-image img {
    max-width: 100%;
    border-radius: 10px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    transform: perspective(1000px) rotateY(-10deg);
}

/* 功能特性 */
.features {
    background-color: var(--light-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark-bg);
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 下载区域 */
.download {
    background-color: white;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.download-card {
    background-color: var(--light-bg);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.download-icon {
    font-size: 3.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--dark-bg);
}

.download-card p {
    color: #666;
    margin-bottom: 20px;
}

/* 关于部分 */
.about {
    background-color: var(--light-bg);
}

.about-content {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-text {
    max-width: 800px;
    text-align: center;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
}

.contact-info {
    margin-top: 30px;
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.contact-info p {
    margin: 10px 0;
    font-size: 1.1rem;
}

.contact-info i {
    color: var(--primary-color);
    margin-right: 10px;
}

/* 页脚 */
footer {
    background-color: var(--dark-bg);
    color: var(--light-text);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-logo h3 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.footer-links h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: white;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #aaa;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    display: inline-block;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-icons a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 响应式设计 */
@media screen and (max-width: 1024px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }

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

@media screen and (max-width: 768px) {
    body {
        overflow-x: hidden;
    }

    .nav-links {
        position: absolute;
        right: 0;
        top: 70px;
        height: calc(100vh - 70px);
        background-color: white;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: space-around;
        width: 50%;
        transform: translateX(100%);
        transition: transform 0.5s ease-in;
        box-shadow: -5px 0 10px rgba(0, 0, 0, 0.1);
    }

    .nav-links li {
        opacity: 0;
        margin: 0;
    }

    .burger {
        display: block;
    }

    .nav-active {
        transform: translateX(0%);
    }

    .section-title {
        font-size: 2rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-content h2 {
        font-size: 1.5rem;
    }
}

@media screen and (max-width: 500px) {
    .nav-links {
        width: 70%;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-icons {
        justify-content: center;
    }
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card, .download-card, .about-text {
    animation: fadeIn 0.5s ease-in-out forwards;
}

/* 应用模型样式 - 代替缺少的图片 */
.app-mockup {
    width: 300px;
    height: 500px;
    background-color: #fff;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    position: relative;
    transform: perspective(1000px) rotateY(-10deg);
    transition: all 0.3s ease;
    border: 8px solid #333;
}

.app-mockup:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.app-header {
    background: linear-gradient(to right, #3498db, #8e44ad);
    padding: 15px;
    color: white;
    position: relative;
}

.app-dots {
    display: flex;
    margin-bottom: 10px;
}

.app-dots span {
    width: 8px;
    height: 8px;
    background-color: #fff;
    border-radius: 50%;
    margin-right: 5px;
    opacity: 0.7;
}

.app-title {
    font-weight: bold;
    text-align: center;
    font-size: 18px;
}

.app-content {
    padding: 20px;
    height: calc(100% - 80px);
    display: flex;
    flex-direction: column;
    justify-content: space-around;
}

.app-feature {
    display: flex;
    align-items: center;
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.app-feature:hover {
    transform: translateX(10px);
    background-color: #dfe6e9;
}

.app-feature i {
    font-size: 24px;
    color: var(--primary-color);
    margin-right: 15px;
}

.app-feature span {
    font-weight: bold;
    color: var(--dark-bg);
}