* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

:root {
    --bg-primary: #0f1115;
    --bg-secondary: #171a21;
    --bg-card: #1e222b;
    --text-primary: #e6e8eb;
    --text-secondary: #9aa0a6;
    --accent: #4a8cff;
    --accent-hover: #6ba3ff;
    --border: #2a2f3a;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* 动态粒子背景 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: radial-gradient(circle at top left, rgba(74, 140, 255, 0.14), transparent 35%),
                radial-gradient(circle at bottom right, rgba(74, 140, 255, 0.14), transparent 35%);
}

.particles span {
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(74, 140, 255, 0.35);
    border-radius: 50%;
    animation: float 12s infinite ease-in-out;
}

@keyframes float {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-10vh) translateX(80px);
        opacity: 0;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* 导航栏 */
.navbar {
    position: sticky;
    top: 0;
    background: rgba(15, 17, 21, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.nav-inner {
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 34px;
    font-weight: 800;
    letter-spacing: 1.5px;
    background: linear-gradient(135deg, #fff 0%, #94bfff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.lang-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.lang-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* 首屏 */
.hero {
    padding: 100px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: 44px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, #94bfff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* 区块通用 */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 60px;
    font-size: 16px;
}

/* 产品区块 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
    gap: 32px;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px 32px;
    transition: all 0.3s;
}

.product-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(74, 140, 255, 0.1);
}

.product-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.product-card .product-intro {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 15px;
}

.product-card h4 {
    font-size: 16px;
    margin-bottom: 14px;
    color: var(--accent);
}

.product-card ul {
    list-style: none;
}

.product-card li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    font-size: 15px;
}

.product-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* 定价区块 */
.pricing-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 40px 32px;
    transition: all 0.3s;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(74, 140, 255, 0.12);
}

.pricing-card.recommended {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent), 0 12px 40px rgba(74, 140, 255, 0.18);
}

.recommended-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, #4a8cff, #6ba3ff);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
}

.pricing-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.price-note {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 16px;
}

.pricing-desc {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 24px;
    line-height: 1.7;
}

.pricing-features {
    list-style: none;
    margin-bottom: 28px;
    flex: 1;
}

.pricing-features li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    font-size: 15px;
}

.pricing-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: all 0.3s;
}

.faq-item:hover {
    border-color: var(--accent);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    text-align: left;
    padding: 18px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-icon {
    font-size: 20px;
    color: var(--accent);
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    padding: 0 24px 18px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

/* 联系区块 */
.contact-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.contact-card {
    text-align: center;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.3s;
}

.contact-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(74, 140, 255, 0.1);
}

.contact-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
}

.contact-card p, .contact-card a {
    color: var(--text-secondary);
    font-size: 15px;
    word-break: break-all;
    text-decoration: none;
}

.contact-card a:hover {
    color: var(--accent);
}

/* 页脚 */
.footer {
    padding: 32px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* 语言控制 */
.lang-en {
    display: none;
}

body.en .lang-zh {
    display: none;
}

body.en .lang-en {
    display: block;
}

/* 响应式 */
@media (max-width: 768px) {
    .logo {
        font-size: 24px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .nav-links {
        display: none;
    }

    .products-grid,
    .pricing-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 60px 0;
    }

    .hero {
        padding: 60px 0 40px;
    }
}