/* 全局样式 */
:root {
    --primary-color: #8B5CF6;
    --secondary-color: #333333;
    --accent-color: #8B5CF6;
    --text-color: #333333;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --dark-bg: #ffffff;
    --card-bg: #ffffff;
    --hover-color: #7C3AED;
}

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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--dark-bg);
}

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

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 24px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    margin: 0 15px;
    font-weight: 500;
    transition: color 0.3s;
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-switch {
    display: flex;
    gap: 5px;
}

.auth-buttons .btn {
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-login {
    background: var(--primary-color);
    border: none;
    color: var(--white);
}

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

.btn-register {
    background: var(--primary-color);
    border: none;
    color: var(--dark-bg);
}

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

.lang-btn {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

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

.lang-btn:hover:not(.active) {
    background: rgba(0, 184, 212, 0.1);
}

/* 主横幅样式 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
}

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

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

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.hero-content p {
    font-size: 20px;
    margin-bottom: 30px;
    color: #666;
}

.hero-buttons .btn {
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 6px;
    margin-right: 15px;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    border: none;
}

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

.hero-image {
    flex: 1;
    text-align: right;
}

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

/* 功能特点样式 */
.features {
    padding: 80px 0;
    background: var(--light-gray);
}

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

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

.feature-card {
    text-align: center;
    padding: 30px;
    background: var(--white);
    border-radius: 10px;
    transition: transform 0.3s;
    border: 1px solid rgba(0,0,0,0.05);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.feature-card i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--secondary-color);
}

/* 平台支持样式 */
.platforms {
    padding: 80px 0;
    background: var(--white);
}

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

.platform-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.platform-logos img {
    height: 40px;
    opacity: 0.6;
    transition: opacity 0.3s;
    filter: brightness(0) saturate(100%) invert(0%) sepia(0%) saturate(0%) hue-rotate(0deg) brightness(100%) contrast(100%);
}

.platform-logos img:hover {
    opacity: 1;
}

/* 页脚样式 */
.footer {
    background: var(--light-gray);
    color: var(--text-color);
    padding: 60px 0 20px;
    border-top: 1px solid rgba(0,0,0,0.1);
}

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

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

.social-links a {
    color: var(--text-color);
    font-size: 24px;
    margin-right: 15px;
    transition: color 0.3s;
}

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

.footer-bottom {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.logo {
    cursor: pointer;
}

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

.nav-links {
    display: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        height: auto;
        padding: 20px;
    }

    .nav-links {
        margin: 20px 0;
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
    }

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

    .hero-content h1 {
        font-size: 36px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .navbar {
        background: rgba(255, 255, 255, 0.98);
    }
    
    .navbar.scrolled {
        background: rgba(255, 255, 255, 0.98);
    }
}

/* 弹窗样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.modal-content h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 20px;
}

.modal-content p {
    color: var(--text-color);
    margin-bottom: 20px;
    line-height: 1.6;
}

.modal-close {
    background: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 8px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.modal-close:hover {
    background: var(--hover-color);
}