:root {
    --bg-main: #060913;
    --bg-darker: #02040a;
    --primary: #4f46e5;
    --primary-glow: rgba(79, 70, 229, 0.6);
    --secondary: #9333ea;
    --secondary-glow: rgba(147, 51, 234, 0.6);
    --accent: #38bdf8;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, .logo {
    font-family: 'Outfit', sans-serif;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 动态背景 */
#particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(79, 70, 229, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(147, 51, 234, 0.15), transparent 25%);
}

.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.5;
    animation: float 10s infinite ease-in-out alternate;
}
.orb-1 {
    width: 300px;
    height: 300px;
    background: var(--primary);
    top: -100px;
    left: -100px;
}
.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary);
    bottom: -150px;
    right: -100px;
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0); }
    100% { transform: translate(30px, 50px); }
}

/* 渐变文本 */
.text-gradient {
    background: linear-gradient(135deg, var(--accent), var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    box-shadow: 0 4px 15px var(--primary-glow);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--secondary-glow);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover {
    background: rgba(79, 70, 229, 0.1);
}
.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    backdrop-filter: blur(15px);
    background: rgba(6, 9, 19, 0.7);
    border-bottom: 1px solid var(--card-border);
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.logo-sub {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}
.nav-links a {
    color: var(--text-main);
    font-weight: 500;
    transition: color 0.3s;
}
.nav-links a:hover {
    color: var(--accent);
}
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}
.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-main);
}

/* 布局及区段通用 */
.section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}
.bg-darker {
    background-color: var(--bg-darker);
    max-width: 100%;
    padding-left: max(2rem, calc((100% - 1200px) / 2));
    padding-right: max(2rem, calc((100% - 1200px) / 2));
}
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}
.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}
.section-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 首屏 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}
.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}
.hero-title {
    font-size: 4.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}
.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 600px;
}
.hero-actions {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 3rem;
    justify-content: center;
}
.hero-stats {
    display: flex;
    gap: 4rem;
    border-top: 1px solid var(--card-border);
    padding-top: 2.5rem;
    justify-content: center;
}
.stat-item h3 {
    font-size: 1.8rem;
    color: var(--accent);
}
.stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
}



/* 特性板块 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 2.5rem;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    transition: transform 0.3s, border-color 0.3s;
}
.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}
.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}
.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}
.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 价格板块 */
.pricing-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}
.tab-btn {
    background: transparent;
    border: 1px solid var(--card-border);
    color: var(--text-muted);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}
.tab-btn.active, .tab-btn:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    align-items: center;
}
.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2.5rem;
    position: relative;
    transition: transform 0.3s;
}
.pricing-card:hover {
    transform: translateY(-10px);
}
.pricing-card.popular {
    border-color: var(--primary);
    background: linear-gradient(to bottom, rgba(79, 70, 229, 0.1), var(--card-bg));
    transform: scale(1.05);
}
.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-10px);
}
.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}
.pricing-header {
    text-align: center;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 2rem;
}
.pricing-header h3 {
    color: var(--text-muted);
    margin-bottom: 1rem;
}
.price {
    font-size: 3rem;
    font-weight: 800;
    color: #fff;
}
.currency {
    font-size: 1.5rem;
    vertical-align: super;
}
.period {
    font-size: 1rem;
    color: var(--text-muted);
}
.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
}
.pricing-features li {
    margin-bottom: 1rem;
    color: var(--text-main);
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.check {
    color: var(--accent);
    font-weight: bold;
}
.pricing-btn {
    width: 100%;
}

/* 评价板块 */
.reviews-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.review-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 2rem;
    border-radius: 16px;
}
.stars {
    color: #fbbf24;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}
.review-text {
    font-style: italic;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}
.reviewer {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}
.reviewer h4 {
    font-size: 1rem;
}
.reviewer p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 常见问题 */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid var(--card-border);
    padding: 1.5rem 0;
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}
.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    color: var(--text-muted);
}
.faq-item.active .faq-answer {
    max-height: 200px;
    margin-top: 1rem;
}
.faq-item .icon {
    font-size: 1.5rem;
    transition: transform 0.3s;
}
.faq-item.active .icon {
    transform: rotate(45deg);
}

/* 知识库 */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.kb-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 1.5rem;
    border-radius: 12px;
    transition: all 0.3s;
    display: block;
}
.kb-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-3px);
    border-color: var(--secondary);
}
.kb-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}
.kb-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}
.kb-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* 底部 */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--card-border);
    padding: 4rem 2rem 2rem;
}
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 3rem;
    margin-bottom: 3rem;
}
.footer-brand h2 {
    margin-bottom: 1rem;
}
.footer-brand p {
    color: var(--text-muted);
    max-width: 300px;
}
.footer-links {
    display: flex;
    gap: 4rem;
}
.link-group h4 {
    margin-bottom: 1.5rem;
    color: var(--text-main);
}
.link-group a {
    display: block;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
    transition: color 0.3s;
}
.link-group a:hover {
    color: var(--primary);
}
.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--card-border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links, .nav-btn {
        display: none;
    }
    .mobile-menu-toggle {
        display: flex;
    }
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-actions {
        justify-content: center;
        flex-direction: column;
    }
    .hero-stats {
        justify-content: center;
        flex-wrap: wrap;
    }
    .pricing-card.popular {
        transform: none;
    }
    .pricing-card.popular:hover {
        transform: translateY(-5px);
    }
}