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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    transition: all 0.3s ease;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

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

.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 1000 100" fill="white" opacity="0.1"><polygon points="0,100 100,0 200,0 300,100 400,0 500,0 600,100 700,0 800,0 900,100 1000,0 1000,100"/></svg>') repeat-x;
    background-size: 200px 100px;
    animation: wave 20s linear infinite;
}

@keyframes wave {
    0% { background-position-x: 0; }
    100% { background-position-x: 200px; }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: 2;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #f0f0f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-features {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    backdrop-filter: blur(10px);
    font-size: 0.9rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: white;
    color: #667eea;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

.phone-mockup {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-screenshot {
    max-width: 300px;
    height: auto;
    border-radius: 25px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.app-screenshot:hover {
    transform: scale(1.05);
}

/* 功能特色区域 */
.features {
    padding: 100px 0;
    background: #f8fafc;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.feature-description {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.feature-image-placeholder {
    width: 100%;
    height: 200px;
    background: #f0f0f0;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    border: 2px dashed #ddd;
}

.feature-image-placeholder img {
    max-width: 100%;
    max-height: 100%;
    object-fit: cover;
    border-radius: 8px;
}

/* 应用截图展示区域 */
.screenshots {
    padding: 100px 0;
    background: white;
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.screenshot-item {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.screenshot-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.screenshot-item img {
    width: 100%;
    height: auto;
    display: block;
}

/* 用户评价区域 */
.reviews {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
}

.rating-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.stars {
    display: flex;
    gap: 0.25rem;
}

.stars i {
    color: #fbbf24;
    font-size: 1.5rem;
}

.rating-text {
    font-size: 1.1rem;
    color: #666;
    font-weight: 500;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.review-card {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.review-stars {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.review-stars i {
    color: #fbbf24;
}

.review-text {
    font-style: italic;
    color: #555;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
}

.author-name {
    font-weight: 500;
    color: #333;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.download-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.download-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
}

.info-item i {
    width: 20px;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    background: black;
    color: white;
    padding: 1rem 2rem;
    border-radius: 15px;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.btn-download i {
    font-size: 2rem;
}

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

.btn-small {
    font-size: 0.8rem;
    opacity: 0.8;
}

.btn-large {
    font-size: 1.1rem;
    font-weight: 600;
}

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

.phone-showcase img {
    max-width: 300px;
    height: auto;
    border-radius: 25px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* 关于我们区域 */
.about {
    padding: 100px 0;
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-description {
    font-size: 1.1rem;
    color: #666;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.company-stats {
    display: flex;
    gap: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: #666;
    font-size: 0.9rem;
}

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

.about-image img {
    max-width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 页脚 */
.footer {
    background: #1a202c;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.footer-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-description {
    color: #a0aec0;
    line-height: 1.6;
}

.footer-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

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

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #a0aec0;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.contact-info p {
    color: #a0aec0;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid #2d3748;
    padding-top: 2rem;
    text-align: center;
    color: #a0aec0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .screenshots-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .company-stats {
        justify-content: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-features {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .screenshots-gallery {
        grid-template-columns: 1fr;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .company-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn-primary, .btn-secondary {
        padding: 0.8rem 1.5rem;
        font-size: 0.9rem;
    }
}

/* 滚动动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card {
    animation: fadeInUp 0.6s ease-out;
}

.screenshot-item {
    animation: fadeInUp 0.6s ease-out;
}

.review-card {
    animation: fadeInUp 0.6s ease-out;
}

/* 加载占位符样式 */
.feature-image-placeholder,
.phone-showcase img[src*="placeholder"],
.about-image img[src*="placeholder"] {
    background: linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
                linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
                linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
                linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border: 2px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 0.9rem;
}

.feature-image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.feature-image-placeholder::after {
    content: "";
}

/* 平滑过渡效果 */
* {
    transition: all 0.3s ease;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
}