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

html {
    -webkit-text-size-adjust: 100%;
}

html, body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #0b0f1a;
    color: #e5e7eb;
}

/* 科技感背景 */
.background {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 25% 20%, rgba(0,120,255,0.15), transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(0,255,200,0.12), transparent 40%),
        linear-gradient(135deg, #05070d, #0b1224);
    z-index: -1;
}

/* 首屏 */
.hero {
    min-height: 100svh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 120px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 120px;
    font-weight: 700;
    letter-spacing: 0.25em;
    white-space: nowrap;
    text-shadow:
        0 0 20px rgba(0,150,255,0.4),
        0 0 60px rgba(0,150,255,0.15);
}

.subtitle {
    margin-top: 20px;
    font-size: 16px;
    color: #9ca3af;
    letter-spacing: 0.15em;
}

/* 通用区块 */
.section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 120px 20px;
    text-align: center;
}

.section h2 {
    font-size: 32px;
    margin-bottom: 30px;
}

.text {
    max-width: 720px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.9;
    color: #cbd5f5;
}

/* 产品卡片 */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    padding: 32px;
    border-radius: 14px;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-6px);
    border-color: rgba(0,150,255,0.5);
}

.card h3 {
    margin-bottom: 15px;
    font-size: 20px;
}

.card p {
    font-size: 14px;
    color: #9ca3af;
    line-height: 1.7;
}

/* 优势 */
.advantages {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.advantages span {
    padding: 12px 26px;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 30px;
    font-size: 14px;
}

/* 页脚 */
.footer {
    padding: 50px 20px;
    text-align: center;
    font-size: 14px;
    color: #6b7280;
}

/* 微信 / 手机适配 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 64px;
        letter-spacing: 0.2em;
    }

    .subtitle {
        font-size: 14px;
        letter-spacing: 0.1em;
    }

    .section {
        padding: 80px 20px;
    }
}