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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

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

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: bold;
    color: #667eea;
}

.teams-logo {
    width: 32px;
    height: 32px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn-download {
    background: #667eea;
    color: white;
    padding: 10px 25px;
    border-radius: 8px;
    transition: all 0.3s;
}

.btn-download:hover {
    background: #5568d3;
    color: white;
}

/* 主视觉区 */
.hero {
    padding: 150px 0 100px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 56px;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 30px;
}

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

.btn {
    padding: 15px 35px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

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

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

.hero-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    max-width: 400px;
}

.chat-bubble {
    background: #f0f0f0;
    padding: 15px 20px;
    border-radius: 12px;
    margin-bottom: 12px;
    animation: fadeInUp 0.5s ease-out;
}

.chat-bubble:nth-child(2) {
    animation-delay: 0.2s;
}

.chat-bubble:nth-child(3) {
    animation-delay: 0.4s;
}

.chat-bubble strong {
    display: block;
    margin-bottom: 5px;
    color: #667eea;
}

.chat-bubble span {
    color: #333;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 功能特性 */
.features {
    padding: 100px 0;
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 42px;
    margin-bottom: 60px;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #333;
}

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

/* 定价方案 */
.pricing {
    padding: 100px 0;
    background: white;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1100px;
    margin: 0 auto;
}

.pricing-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    border: 2px solid #e0e0e0;
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    border-color: #667eea;
}

.pricing-card.featured {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #ff6b6b;
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: bold;
}

.pricing-card h3 {
    font-size: 28px;
    margin-bottom: 20px;
}

.pricing-card.featured h3 {
    color: white;
}

.price {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 30px;
}

.price span {
    font-size: 18px;
    font-weight: normal;
    color: #666;
}

.pricing-card.featured .price span {
    color: rgba(255,255,255,0.8);
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

.pricing-features li {
    padding: 12px 0;
    color: #666;
    border-bottom: 1px solid #f0f0f0;
}

.pricing-card.featured .pricing-features li {
    color: white;
    border-bottom-color: rgba(255,255,255,0.2);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.btn-outline {
    display: inline-block;
    padding: 12px 30px;
    border: 2px solid #667eea;
    color: #667eea;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s;
}

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

.pricing-card.featured .btn-primary {
    background: white;
    color: #667eea;
}

.pricing-card.featured .btn-primary:hover {
    background: #f0f0f0;
}

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

.about-content h2 {
    font-size: 42px;
    margin-bottom: 30px;
    text-align: center;
}

.about-content p {
    font-size: 20px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px;
    opacity: 0.95;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 18px;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    background: #1a1a2e;
    color: white;
    padding: 60px 0 30px;
}

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

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

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

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

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

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

.footer-bottom p {
    color: #888;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-buttons {
        justify-content: center;
    }

    .hero-card {
        margin: 0 auto;
    }

    .section-title {
        font-size: 32px;
    }

    .stats {
        gap: 40px;
    }

    .stat-number {
        font-size: 36px;
    }
}