/* --- 全局变量设定 (浅色系主题) --- */
:root {
    --primary-color: #0ea5e9; /* 亮蓝色，代表速度和科技 */
    --primary-hover: #0284c7;
    --secondary-color: #f8fafc;
    --text-main: #334155;
    --text-light: #64748b;
    --bg-main: #ffffff;
    --bg-alt: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s ease;
    
    /* 状态颜色 */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

/* --- 基础重置 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.section {
    padding: 100px 0;
}

.bg-light {
    background-color: var(--bg-alt);
}

.text-center {
    text-align: center;
}

/* --- 动态背景点缀 --- */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, rgba(255,255,255,0) 70%);
}

.circle-1 {
    width: 600px;
    height: 600px;
    top: -200px;
    left: -200px;
    animation: float 15s infinite ease-in-out alternate;
}

.circle-2 {
    width: 400px;
    height: 400px;
    bottom: -100px;
    right: -100px;
    animation: float 20s infinite ease-in-out alternate-reverse;
}

.circle-3 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: pulse 10s infinite ease-in-out;
}

@keyframes float {
    0% { transform: translateY(0) translateX(0); }
    100% { transform: translateY(50px) translateX(50px); }
}

@keyframes pulse {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.8; }
    100% { transform: translate(-50%, -50%) scale(1); opacity: 0.5; }
}

/* 漂浮几何图形 */
.shape {
    position: absolute;
    opacity: 0.15;
    z-index: -1;
}

.shape-square {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: 8px;
    transform: rotate(45deg);
}

.shape-triangle {
    width: 0;
    height: 0;
    border-left: 25px solid transparent;
    border-right: 25px solid transparent;
    border-bottom: 45px solid var(--primary-color);
}

.shape-circle {
    width: 30px;
    height: 30px;
    border: 4px solid var(--primary-color);
    border-radius: 50%;
}

.shape-plus {
    width: 30px;
    height: 30px;
    position: relative;
}
.shape-plus::before, .shape-plus::after {
    content: '';
    position: absolute;
    background-color: var(--primary-color);
    border-radius: 2px;
}
.shape-plus::before { top: 50%; left: 0; width: 100%; height: 6px; transform: translateY(-50%); }
.shape-plus::after { top: 0; left: 50%; width: 6px; height: 100%; transform: translateX(-50%); }

/* 图形分布与动画 */
.shape-1 { top: 15%; left: 10%; animation: float-rotate 12s infinite linear; }
.shape-2 { top: 25%; right: 15%; animation: float-rotate-reverse 15s infinite linear; }
.shape-3 { top: 60%; left: 8%; animation: float-up-down 8s infinite ease-in-out; }
.shape-4 { top: 75%; right: 10%; animation: float-rotate 10s infinite linear; }
.shape-5 { top: 40%; left: 85%; animation: float-up-down 11s infinite ease-in-out alternate-reverse; }
.shape-6 { top: 85%; left: 20%; animation: float-rotate-reverse 14s infinite linear; }

@keyframes float-rotate {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(180deg); }
    100% { transform: translateY(0) rotate(360deg); }
}

@keyframes float-rotate-reverse {
    0% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(40px) rotate(-180deg); }
    100% { transform: translateY(0) rotate(-360deg); }
}

@keyframes float-up-down {
    0% { transform: translateY(0); }
    50% { transform: translateY(-40px); }
    100% { transform: translateY(0); }
}

/* --- 组件样式 --- */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: var(--transition);
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(14, 165, 233, 0.39);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
}

.btn-secondary {
    background-color: white;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-block {
    display: block;
    width: 100%;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), #38bdf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--text-main);
}

.section-header p {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 渐入动画类 */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 浮动动画 */
.float-animation {
    animation: float-y 6s ease-in-out infinite;
}

@keyframes float-y {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

/* --- 导航栏 --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

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

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-main);
}

/* --- 首页主视觉 --- */
.hero {
    padding-top: 150px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: flex;
    align-items: center;
    gap: 50px;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 50px;
}

.hero-stats {
    display: flex;
    gap: 30px;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
    font-weight: 500;
}

.stat-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

/* --- 栅格布局 --- */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* --- 核心优势 --- */
.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(14, 165, 233, 0.1);
    color: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background-color: var(--primary-color);
    color: white;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.feature-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* --- 节点状态 --- */
.status-board {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.status-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    padding: 20px 30px;
    background-color: var(--bg-alt);
    font-weight: 600;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
}

.status-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    transition: background-color 0.2s;
}

.status-row:last-child {
    border-bottom: none;
}

.status-row:hover {
    background-color: var(--bg-alt);
}

.status-row div:first-child {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

.badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-success { background-color: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-warning { background-color: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-danger { background-color: rgba(239, 68, 68, 0.1); color: var(--danger); }

.latency { font-weight: 600; font-family: monospace; }
.latency.excellent { color: var(--success); }
.latency.good { color: var(--primary-color); }
.latency.fair { color: var(--warning); }

/* --- 套餐价格 --- */
.pricing-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-10px);
}

.pricing-card.popular {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    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-color), #38bdf8);
    color: white;
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
}

.pricing-header h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 10px;
}

.price span {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: normal;
}

.pricing-features {
    flex-grow: 1;
    margin-bottom: 30px;
}

.pricing-features li {
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.95rem;
}

.pricing-features li.disabled {
    color: var(--text-light);
    opacity: 0.7;
}

.text-primary {
    color: var(--primary-color);
    margin-top: 4px;
}

/* --- 用户评价 --- */
.review-card {
    background: white;
    padding: 30px;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.stars {
    color: #fbbf24;
    margin-bottom: 15px;
    font-size: 0.9rem;
}

.review-text {
    font-style: italic;
    color: var(--text-light);
    margin-bottom: 20px;
    min-height: 80px;
}

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

.avatar {
    width: 45px;
    height: 45px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.reviewer .info h4 {
    font-size: 1rem;
    margin-bottom: 2px;
}

.reviewer .info span {
    font-size: 0.85rem;
    color: var(--text-light);
}

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

.faq-item {
    background: white;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background-color: white;
    transition: var(--transition);
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.faq-question i {
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question {
    background-color: var(--bg-alt);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--text-light);
}

.faq-item.active .faq-answer {
    padding: 20px 25px;
    max-height: 300px; /* 足够大以容纳内容 */
}

/* --- 知识库预览 --- */
.knowledge-grid {
    gap: 25px;
}

.kb-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.kb-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.kb-img {
    height: 160px;
    overflow: hidden;
}

.kb-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.kb-card:hover .kb-img img {
    transform: scale(1.05);
}

.kb-content {
    padding: 20px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.kb-content h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    line-height: 1.4;
    color: var(--text-main);
}

.kb-content p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 15px;
    flex-grow: 1;
}

.read-more {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

/* --- 底部区域 --- */
.footer {
    background-color: #0f172a; /* 深色背景用于页脚对比 */
    color: white;
    padding: 80px 0 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    color: white;
    margin-bottom: 20px;
    display: inline-flex;
}

.footer-brand p {
    color: #94a3b8;
    max-width: 300px;
}

.footer-links h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 30px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-links ul li {
    margin-bottom: 12px;
}

.footer-links a {
    color: #94a3b8;
}

.footer-links a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #64748b;
    font-size: 0.9rem;
}

/* --- 响应式设计 --- */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-10px);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none; /* 移动端隐藏导航链接，可后期加汉堡菜单逻辑 */
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        gap: 15px;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-cta {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .status-header {
        display: none; /* 移动端隐藏表头 */
    }
    
    .status-row {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
        padding: 15px;
    }
    
    .status-row div:first-child {
        grid-column: span 2;
        margin-bottom: 5px;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}