/* 全局样式 */
:root {
    --primary-color: #7371fc;
    --secondary-color: #fe60a1;
    --dark-color: #333333;
    --light-color: #f9f9f9;
    --accent-color: #57ebde;
    --gradient-primary: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    --gradient-accent: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    --shadow-light: 0 4px 12px rgba(115, 113, 252, 0.3);
    --shadow-medium: 0 8px 20px rgba(115, 113, 252, 0.4);
    --shadow-heavy: 0 15px 50px rgba(0, 0, 0, 0.1);
    --border-radius: 15px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
    color: var(--dark-color);
    background-color: var(--light-color);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
}

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

.section {
    padding: 80px 0;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 30px;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    text-align: center;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary:hover {
    background: rgba(115, 113, 252, 0.1);
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 50px;
}

/* 头部导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
    transition: var(--transition);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

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

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

.nav-links a {
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width 0.3s ease;
}

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

.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

/* 英雄区域 */
.hero {
    padding: 150px 0 100px;
    background: radial-gradient(circle at top right, rgba(87, 235, 222, 0.1), transparent 70%), 
                radial-gradient(circle at bottom left, rgba(254, 96, 161, 0.1), transparent 70%);
    overflow: hidden;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/hero-bg.svg') no-repeat center center;
    background-size: cover;
    opacity: 0.1;
    z-index: -1;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

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

.hero-image img {
    max-width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    transition: var(--transition);
    animation: float 6s ease-in-out infinite;
}

.hero-image img:hover {
    transform: translateY(-10px) scale(1.02);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* 核心优势 */
.features {
    background-color: white;
    position: relative;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    text-align: center;
    border: 1px solid rgba(115, 113, 252, 0.1);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

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

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 25px;
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

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

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

/* 功能展示 */
.showcase {
    background: var(--light-color);
    position: relative;
}

.showcase-item {
    display: flex;
    align-items: center;
    margin-bottom: 120px;
    gap: 60px;
}

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

.showcase-item:nth-child(even) {
    flex-direction: row-reverse;
}

.showcase-content {
    flex: 1;
}

.showcase-image {
    flex: 1;
    position: relative;
}

.showcase-image img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-heavy);
    transition: var(--transition);
}

.showcase-image:hover img {
    transform: scale(1.05);
}

.showcase-title {
    font-size: 2.2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.showcase-description {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 25px;
    line-height: 1.7;
}

.showcase-features {
    list-style: none;
}

.showcase-features li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

.showcase-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 用户评价 */
.testimonials {
    background: white;
    position: relative;
    overflow: hidden;
}

.testimonial-container {
    overflow: hidden;
    padding: 30px 0;
}

.testimonial-slider {
    display: flex;
    transition: transform 0.5s ease;
}

.testimonial-card {
    min-width: 350px;
    margin: 0 15px;
    padding: 40px 30px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(115, 113, 252, 0.1);
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.testimonial-content {
    font-style: italic;
    margin-bottom: 25px;
    color: #555;
    line-height: 1.6;
    font-size: 1.1rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 15px;
    object-fit: cover;
    border: 3px solid var(--primary-color);
}

.author-name {
    font-weight: 600;
    color: var(--dark-color);
}

.author-title {
    font-size: 0.9rem;
    color: #777;
}

.testimonial-controls {
    display: flex;
    justify-content: center;
    margin-top: 40px;
    gap: 10px;
}

.control-btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ddd;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.control-btn.active {
    background: var(--primary-color);
    transform: scale(1.2);
}

/* 下载区域 */
.download {
    background: var(--gradient-accent);
    color: white;
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/download/download-bg.svg') no-repeat center center;
    background-size: cover;
    opacity: 0.08;
}

.download::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.2) 0%, rgba(0, 0, 0, 0.1) 100%);
    z-index: 1;
}

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

.download-title, .download-subtitle {
    color: white;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 2;
}

.download-title {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
}

.download-subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
    font-weight: 400;
    line-height: 1.6;
}

.download-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 40px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 15px 30px;
    border-radius: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
}

.download-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
}

.download-btn img {
    width: 32px;
    height: 32px;
    filter: brightness(0) invert(1); /* 转换为白色 */
    transition: var(--transition);
}

.download-btn:hover img {
    transform: scale(1.1);
}

/* FAQ区域 */
.faq {
    background: var(--light-color);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.faq-item {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.faq-question {
    padding: 25px 30px;
    cursor: pointer;
    font-weight: 600;
    color: var(--dark-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq-question:hover {
    background: rgba(115, 113, 252, 0.05);
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
    color: #666;
    line-height: 1.6;
}

.faq-item.active .faq-answer {
    padding: 0 30px 25px;
    max-height: 200px;
}

.faq-toggle {
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

/* 联系支持 */
.contact {
    background: white;
}

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

.contact-item {
    text-align: center;
    padding: 40px 20px;
    border-radius: var(--border-radius);
    background: var(--light-color);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.contact-title {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    transition: var(--transition);
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-light);
}

/* 页脚 */
footer {
    background: var(--dark-color);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.footer-logo img {
    filter: brightness(0) invert(1); /* 转换为白色 */
    opacity: 0.9;
    transition: var(--transition);
}

.footer-logo:hover img {
    opacity: 1;
    transform: scale(1.05);
}

.footer-description {
    color: #ccc;
    line-height: 1.6;
    margin-bottom: 20px;
}

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

.language-selector select {
    background: transparent;
    color: #ccc;
    border: 1px solid #555;
    padding: 5px 10px;
    border-radius: 5px;
}

.footer-title {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--primary-color);
}

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

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

.footer-links a {
    color: #ccc;
    transition: var(--transition);
}

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

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #555;
    color: #999;
}

/* 额外元素 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-light);
}

.chat-button {
    position: fixed;
    bottom: 30px;
    right: 100px;
    background: var(--secondary-color);
    color: white;
    padding: 15px 20px;
    border-radius: 30px;
    cursor: pointer;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: 10px;
}

.chat-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.subscribe-popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    max-width: 400px;
    width: 90%;
}

.subscribe-popup.visible {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.close-popup {
    position: absolute;
    top: 15px;
    right: 20px;
    cursor: pointer;
    font-size: 1.2rem;
    color: #999;
    transition: var(--transition);
}

.close-popup:hover {
    color: var(--dark-color);
}

.subscribe-title {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.subscribe-description {
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
}

.subscribe-form {
    display: flex;
    gap: 10px;
}

.subscribe-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 25px;
    outline: none;
    transition: var(--transition);
}

.subscribe-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(115, 113, 252, 0.1);
}

.subscribe-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
}

.subscribe-button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
}

@media (max-width: 992px) {
    .section-title {
        font-size: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .showcase-item, .showcase-item:nth-child(even) {
        flex-direction: column;
        margin-bottom: 80px;
        text-align: center;
    }
    
    .showcase-content {
        order: 2;
    }
    
    .showcase-image {
        order: 1;
        margin-bottom: 30px;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .navbar {
        position: relative;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: var(--transition);
    }
    
    .nav-links.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-links li {
        margin: 15px 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 250px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-title::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .chat-button {
        right: 20px;
        padding: 12px 15px;
    }
    
    .chat-button span {
        display: none;
    }
    
    .back-to-top {
        bottom: 90px;
        right: 20px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        width: 95%;
        padding: 0 10px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .showcase-item {
        margin-bottom: 60px;
    }
    
    .testimonial-card {
        min-width: 280px;
        padding: 30px 20px;
    }
}