:root {
    --primary-color: #4361ee;
    --primary-hover: #3a0ca3;
    --secondary-color: #4cc9f0;
    --text-main: #2b2d42;
    --text-muted: #6c757d;
    --bg-main: #f8f9fa;
    --bg-card: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-main);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    pointer-events: none;
}

/* 动态背景 */
.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
}

.shape {
    position: absolute;
    filter: blur(80px);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 20s infinite alternate ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: #e0c3fc;
    top: -100px;
    left: -100px;
}

.shape-2 {
    width: 500px;
    height: 500px;
    background: #8ec5fc;
    bottom: -150px;
    right: -150px;
    animation-delay: -5s;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: #c2e9fb;
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 25s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 玻璃拟物化卡片 */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.12);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    text-decoration: none;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover:not(.nav-btn) {
    color: var(--primary-color);
}

/* 按钮 */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: linear-gradient(45deg, var(--primary-color), #4cc9f0);
    color: white !important;
    border: none;
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.5);
    color: var(--primary-color) !important;
    border: 1px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white !important;
}

.btn-large {
    padding: 14px 32px;
    font-size: 1.1rem;
}

.block-btn {
    display: block;
    width: 100%;
    margin-top: 20px;
}

/* 通用区块 */
.section {
    padding: 100px 0;
}

.bg-light {
    background: rgba(255,255,255,0.3);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 36px;
    margin-bottom: 15px;
    background: linear-gradient(45deg, var(--text-main), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header p {
    color: var(--text-muted);
    font-size: 18px;
}

/* 首屏 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-content {
    text-align: center;
    max-width: 800px;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-num {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-desc {
    color: var(--text-muted);
}

/* 核心优势 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    padding: 40px 30px;
    text-align: center;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 22px;
}

.feature-card p {
    color: var(--text-muted);
}

/* 节点状态 */
.status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.status-card {
    padding: 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.flag {
    font-size: 24px;
}

.node-name {
    font-weight: 600;
}

.latency {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--text-muted);
}

.ping-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #2ecc71;
    box-shadow: 0 0 10px #2ecc71;
    animation: pulse 2s infinite;
}

.ping-dot.yellow {
    background-color: #f1c40f;
    box-shadow: 0 0 10px #f1c40f;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.8; }
}

/* 套餐价格 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    align-items: center;
}

.pricing-card {
    padding: 40px;
    position: relative;
    overflow: hidden;
}

.pricing-card.popular {
    transform: scale(1.05);
    border-color: var(--primary-color);
    box-shadow: 0 15px 50px rgba(67, 97, 238, 0.15);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-5px);
}

.popular-badge {
    position: absolute;
    top: 20px;
    right: -30px;
    background: var(--primary-color);
    color: white;
    padding: 5px 40px;
    transform: rotate(45deg);
    font-size: 12px;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
}

.price {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-color);
    margin-top: 10px;
}

.price span {
    font-size: 18px;
    color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-features li {
    margin-bottom: 15px;
    color: var(--text-main);
}

/* 用户评价 */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.review-card {
    padding: 30px;
}

.review-stars {
    margin-bottom: 15px;
}

.review-text {
    font-style: italic;
    margin-bottom: 20px;
    color: var(--text-muted);
}

.review-author {
    font-weight: 600;
    text-align: right;
}

/* 常见问题 */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    padding: 20px 30px;
    cursor: pointer;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
}

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

.faq-item.active .faq-answer {
    max-height: 200px;
    margin-top: 15px;
    color: var(--text-muted);
}

.faq-item .icon {
    font-size: 24px;
    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: 20px;
}

.knowledge-card {
    padding: 25px;
    text-decoration: none;
    color: inherit;
    display: block;
}

.knowledge-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.knowledge-card p {
    font-size: 14px;
    color: var(--text-muted);
}

/* 页脚 */
.footer {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    padding: 60px 0 20px;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 30px;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    color: var(--text-muted);
    padding-top: 20px;
    border-top: 1px solid rgba(0,0,0,0.05);
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* 移动端可以简单隐藏或做汉堡菜单 */
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-5px);
    }
}