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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

header {
    background: #667eea;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.8;
}

main {
    margin-top: 80px;
    padding: 2rem 0;
}

.hero {
    text-align: center;
    padding: 4rem 0;
    color: white;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: #ff6b6b;
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
}

.features {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    margin: 4rem 0;
    padding: 3rem;
    border-radius: 20px;
}

.features h2 {
    text-align: center;
    color: white;
    margin-bottom: 2rem;
    font-size: 2.5rem;
}

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

.feature-card {
    background: rgba(255, 255, 255, 0.2);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    color: white;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

footer {
    background: rgba(0, 0, 0, 0.2);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    margin: 0 1rem;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

/* 页面内容样式 (用于隐私政策和服务条款页面) */
.page-content {
    background: rgba(255, 255, 255, 0.95);
    margin: 2rem 0;
    padding: 3rem;
    border-radius: 20px;
    color: #333;
    line-height: 1.8;
}

.page-content h1 {
    color: #667eea;
    margin-bottom: 2rem;
    border-bottom: 3px solid #667eea;
    padding-bottom: 1rem;
}

.page-content h2 {
    color: #764ba2;
    margin: 2rem 0 1rem 0;
}

.page-content h3 {
    color: #667eea;
    margin: 1.5rem 0 0.5rem 0;
}

.page-content ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.page-content li {
    margin: 0.5rem 0;
}

.page-content a {
    color: #667eea;
    text-decoration: none;
}

.page-content a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

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

    .page-content {
        padding: 2rem;
    }
}

/* Support Form Styles */
.support-form {
    max-width: 600px;
    margin: 2rem 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #667eea;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.form-status {
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    font-weight: bold;
}

.form-status.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-status.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.support-info {
    margin-top: 3rem;
    padding: 2rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 15px;
}

.support-info h2 {
    color: #667eea;
    margin-bottom: 1rem;
}

.support-info h3 {
    color: #764ba2;
    margin: 1.5rem 0 0.5rem 0;
}

.support-info ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.support-info li {
    margin: 0.5rem 0;
}

@media (max-width: 768px) {
    .support-form {
        max-width: 100%;
    }

    .support-info {
        padding: 1.5rem;
    }
}