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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
    color: #ffffff;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 2;
}

/* 头部样式 */
.header {
    text-align: center;
    padding: 10px 0;
    position: relative;
}

.logo h1 {
    font-size: 3.5rem;
    background: linear-gradient(45deg, #00d4ff, #0099cc, #0066ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
}

.logo p {
    font-size: 1.2rem;
    color: #8892b0;
    opacity: 0.8;
}

.tech-bg {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

/* 主要内容区域 */
.intro-section {
    text-align: center;
    margin-bottom: 60px;
}

.intro-section h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(45deg, #ffffff, #00d4ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-section p {
    font-size: 1.1rem;
    color: #8892b0;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 版本按钮 */
.version-buttons {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 60px;
}

.btn {
    position: relative;
    padding: 15px 40px;
    font-size: 1.2rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    overflow: hidden;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-free {
    background: linear-gradient(45deg, transparent, transparent);
    border: 2px solid #00d4ff;
    color: #00d4ff;
}

.btn-web {
    background: linear-gradient(45deg, #00ff88, #00cc66);
    color: white;
    border: 2px solid transparent;
}

.btn-pro {
    background: linear-gradient(45deg, #ff6b35, #f7931e);
    color: white;
    border: 2px solid transparent;
}

.btn-demo {
    background: linear-gradient(45deg, #9c27b0, #673ab7);
    color: white;
    border: 2px solid transparent;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.btn-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover .btn-glow {
    left: 100%;
}

/* 功能卡片 */
.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    width: 100%;
    padding: 0 20px;
    margin: 0 auto;
    justify-items: center;
}

.card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 30px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 400px;
    box-sizing: border-box;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.card-header h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.free-card .card-header h3 {
    color: #00d4ff;
}

.web-card .card-header h3 {
    color: #00ff88;
}

.pro-card .card-header h3 {
    color: #ff6b35;
}

.recommend-badge,
.recommend-warning {
    display: inline-block;
    font-size: 0.7rem;
    padding: 4px 8px;
    border-radius: 12px;
    margin-left: 8px;
    font-weight: 600;
    vertical-align: middle;
    box-shadow: 0 2px 8px rgba(0, 212, 255, 0.3);
    animation: glow 2s ease-in-out infinite alternate;
}

.recommend-badge {
    background: linear-gradient(45deg, #00d4ff, #0066ff);
    color: white;
}

.recommend-warning {
    background: linear-gradient(45deg, #ff0000, #fff5e5);
    color: white;
}

@keyframes glow {
    from {
        box-shadow: 0 2px 8px rgba(0, 212, 255, 0.3);
    }
    to {
        box-shadow: 0 4px 16px rgba(0, 212, 255, 0.6);
    }
}

.card-decoration {
    width: 60px;
    height: 4px;
    background: linear-gradient(45deg, #00d4ff, #0099cc);
    margin: 0 auto;
    border-radius: 2px;
}

.card-decoration.web {
    background: linear-gradient(45deg, #00ff88, #00cc66);
}

.card-decoration.pro {
    background: linear-gradient(45deg, #ff6b35, #f7931e);
}

/* 功能列表 */
.feature-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    font-size: 0.95rem;
}

.feature-item .icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 12px;
    font-weight: bold;
}

.free-card .feature-item .icon {
    background: rgba(0, 212, 255, 0.2);
    color: #00d4ff;
}

.web-card .feature-item .icon {
    background: rgba(0, 255, 136, 0.2);
    color: #00ff88;
}

.pro-card .feature-item .icon {
    background: rgba(255, 107, 53, 0.2);
    color: #ff6b35;
}

.feature-item.disabled {
    opacity: 0.4;
}

.feature-item.disabled .icon {
    background: rgba(136, 146, 176, 0.2);
    color: #8892b0;
}

.feature-item.web-feature .icon {
    background: linear-gradient(45deg, #00ff88, #00cc66);
    color: white;
}

.feature-item.pro-feature .icon {
    background: linear-gradient(45deg, #ff6b35, #f7931e);
    color: white;
}

/* 底部 */
.footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 20px;
    position: relative;
}

.footer-links {
    margin-top: 15px;
}

.official-site-btn {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(45deg, #00d4ff, #0066ff);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.official-site-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.5);
}

/* Video Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
}

.modal-content {
    background-color: #1a1a2e;
    margin: 5% auto;
    padding: 20px;
    border: 1px solid #00d4ff;
    border-radius: 10px;
    width: 80%;
    max-width: 800px;
    position: relative;
}

.close {
    color: #00d4ff;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 15px;
    top: 10px;
    z-index: 1001;
}

.close:hover,
.close:focus {
    color: #ff6b35;
}

/* 动画 */
@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* 响应式样式 */
@media (max-width: 768px) {
    .version-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .version-buttons .btn {
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }

    .feature-cards {
        flex-direction: column;
    }

    .card {
        width: 100%;
        max-width: 400px;
        margin: 10px auto;
    }

    .intro-section p {
        padding: 0 15px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .header .logo h1 {
        font-size: 24px;
    }

    .card-header h3 {
        font-size: 18px;
    }

    .feature-item {
        font-size: 14px;
    }
}