/* 基础样式复位 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Roboto', 'Segoe UI', sans-serif;
    background-color: #0b132b;
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 动态蓝色背景动画 */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: linear-gradient(135deg, #0b132b, #1c2541, #3a506b);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 点缀光晕特效 */
.glow-circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(91,192,190,0.4) 0%, rgba(0,0,0,0) 70%);
    filter: blur(40px);
    z-index: -1;
    animation: float 10s infinite ease-in-out alternate;
}

.glow-1 { width: 400px; height: 400px; top: -100px; left: -100px; }
.glow-2 { width: 500px; height: 500px; bottom: 20%; right: -200px; animation-delay: -5s; }

@keyframes float {
    0% { transform: translateY(0) scale(1); }
    100% { transform: translateY(30px) scale(1.1); }
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(11, 19, 43, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #5bc0be;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #e0e0e0;
    font-size: 15px;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #5bc0be;
}

.btn-primary {
    background: linear-gradient(90deg, #5bc0be, #3a506b);
    color: white;
    padding: 10px 24px;
    border-radius: 30px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(91, 192, 190, 0.4);
}

/* 统一版块样式 */
section {
    padding: 100px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 80px; /* offset for nav */
}

.hero h1 {
    font-size: 56px;
    margin-bottom: 20px;
    background: linear-gradient(to right, #ffffff, #5bc0be);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 20px;
    color: #a0aec0;
    margin-bottom: 40px;
    max-width: 600px;
}

.hero .btn-large {
    font-size: 18px;
    padding: 15px 40px;
}

/* 核心优势板块 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s, background 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.1);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
    color: #5bc0be;
}

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

.review-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: 20px;
    border-left: 4px solid #5bc0be;
}

.review-stars {
    color: #f6ad55;
    margin-bottom: 10px;
}

.review-author {
    margin-top: 20px;
    font-weight: bold;
    color: #a0aec0;
}

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

.faq-item {
    margin-bottom: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s;
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.1);
}

.faq-answer {
    padding: 0 20px 20px;
    color: #cbd5e0;
    display: none;
}

/* 节点状态板块 */
.status-list {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 20px;
}

.status-item {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.status-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: #48bb78;
    border-radius: 50%;
    margin-right: 10px;
    box-shadow: 0 0 10px #48bb78;
}

.ping-time {
    color: #5bc0be;
    font-weight: bold;
}

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

.pricing-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    transition: transform 0.3s;
}

.pricing-card.popular {
    transform: scale(1.05);
    background: rgba(91, 192, 190, 0.1);
    border-color: #5bc0be;
    box-shadow: 0 10px 30px rgba(91, 192, 190, 0.2);
}

.pricing-card:hover {
    transform: translateY(-10px);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-10px);
}

.price {
    font-size: 48px;
    font-weight: bold;
    margin: 20px 0;
}

.price span {
    font-size: 20px;
    color: #a0aec0;
}

.features-list {
    list-style: none;
    margin: 30px 0;
    text-align: left;
}

.features-list li {
    margin-bottom: 15px;
    color: #cbd5e0;
}

.features-list li::before {
    content: "✓ ";
    color: #5bc0be;
    font-weight: bold;
}

/* 知识库板块 */
.kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.kb-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: background 0.3s;
}

.kb-card:hover {
    background: rgba(255, 255, 255, 0.1);
}

.kb-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #5bc0be;
}

.kb-card p {
    font-size: 14px;
    color: #a0aec0;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 40px; }
    .pricing-card.popular { transform: scale(1); }
    .pricing-card.popular:hover { transform: translateY(-10px); }
}

/* Footer */
footer {
    text-align: center;
    padding: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #a0aec0;
    margin-top: 50px;
}