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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.version {
    font-size: 1rem;
    opacity: 0.95;
    background: rgba(255, 255, 255, 0.2);
    display: inline-block;
    padding: 8px 20px;
    border-radius: 20px;
    margin-top: 10px;
}

main {
    padding: 40px;
}

.welcome-section {
    margin-bottom: 30px;
}

.welcome-text {
    font-size: 1.1rem;
    color: #333;
    text-align: center;
    line-height: 1.8;
}

.notice-section {
    margin-bottom: 30px;
}

.notice-box {
    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
    padding: 20px;
    border-radius: 10px;
    border-left: 5px solid #fdcb6e;
    color: #2d3436;
    font-size: 1rem;
}

.notice-box strong {
    color: #d63031;
}

.tutorial-section {
    text-align: center;
    margin-bottom: 40px;
}

.tutorial-link {
    color: #667eea;
    text-decoration: none;
    font-size: 1rem;
    border-bottom: 2px solid transparent;
    transition: border-bottom 0.3s;
}

.tutorial-link:hover {
    border-bottom: 2px solid #667eea;
}

.download-section {
    margin-bottom: 50px;
}

.download-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 18px 30px;
    border-radius: 10px;
    text-decoration: none;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.download-btn .icon {
    width: 24px;
    height: 24px;
}

.download-btn.windows {
    background: linear-gradient(135deg, #0078d4 0%, #005a9e 100%);
}

.download-btn.windows:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 120, 212, 0.4);
}

.download-btn.macos {
    background: linear-gradient(135deg, #555555 0%, #333333 100%);
}

.download-btn.macos:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(85, 85, 85, 0.4);
}

.download-btn.android {
    background: linear-gradient(135deg, #3ddc84 0%, #2ba55d 100%);
}

.download-btn.android:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(61, 220, 132, 0.4);
}

.changelog-section {
    margin-bottom: 40px;
}

.changelog-section h2 {
    font-size: 1.8rem;
    color: #333;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
}

.changelog-list {
    list-style: none;
    padding: 0;
}

.changelog-list li {
    padding: 15px 0;
    padding-left: 30px;
    position: relative;
    color: #555;
    border-bottom: 1px solid #eee;
}

.changelog-list li:last-child {
    border-bottom: none;
}

.changelog-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
    font-size: 1.2rem;
}

footer {
    background: #f8f9fa;
    padding: 30px 40px;
    text-align: center;
}

.footer-links {
    font-size: 1rem;
    color: #666;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #764ba2;
    text-decoration: underline;
}

.separator {
    margin: 0 10px;
    color: #999;
}

.divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 20px auto 0;
    border-radius: 2px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 1.8rem;
    }

    main {
        padding: 25px;
    }

    .download-buttons {
        grid-template-columns: 1fr;
    }

    .changelog-section h2 {
        font-size: 1.5rem;
    }

    footer {
        padding: 20px 25px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .version {
        font-size: 0.9rem;
        padding: 6px 15px;
    }

    .welcome-text {
        font-size: 1rem;
    }

    .download-btn {
        font-size: 0.95rem;
        padding: 15px 20px;
    }
}