/* ==========================================================================
   牧牛云机场 (muniuyunjc.homes) 官方落地页专属 CSS 样式表
   整体风格：高解析、高饱和产品图，轻设计高逼格，楷体艺术排版
   ========================================================================== */

:root {
    --bg-gradient: linear-gradient(to right, rgb(55, 59, 68), rgb(66, 134, 244));
    --card-bg: rgba(255, 255, 255, 0.08);
    --card-hover-bg: rgba(255, 255, 255, 0.14);
    --border-color: rgba(255, 255, 255, 0.18);
    --accent-red: #ff3b30;
    --accent-cyan: #00f2fe;
    --accent-blue: #4facfe;
    --accent-gold: #ffbe0b;
    --accent-emerald: #00f5d4;
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.85);
    --text-muted: rgba(255, 255, 255, 0.65);
    --font-kaiti: 'KaiTi', '楷体', STKaiti, 'SimSun', serif;
    --shadow-glow: 0 10px 30px rgba(0, 242, 254, 0.25);
    --shadow-red-glow: 0 10px 30px rgba(255, 59, 48, 0.3);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-kaiti);
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
}

/* 动态背景 Canvas 容器 */
#bgCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    opacity: 0.6;
}

/* 通用容器与栅格 */
.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 90px 0;
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 15px;
    letter-spacing: 2px;
    background: linear-gradient(135deg, #ffffff 0%, #00f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.section-subtitle {
    text-align: center;
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 50px;
    max-width: 760px;
    margin-left: auto;
    margin-right: auto;
}

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(35, 39, 48, 0.75);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-img {
    width: 44px;
    height: 44px;
    filter: drop-shadow(0 0 8px rgba(255, 59, 48, 0.6));
    transition: transform 0.3s ease;
}

.logo:hover .logo-img {
    transform: scale(1.08) rotate(5deg);
}

.logo-text {
    font-size: 1.65rem;
    font-weight: bold;
    letter-spacing: 1px;
    background: linear-gradient(135deg, #ff4e50 0%, #f9d423 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-badge {
    font-size: 0.75rem;
    background: rgba(255, 59, 48, 0.2);
    border: 1px solid var(--accent-red);
    color: #ff6b6b;
    padding: 2px 8px;
    border-radius: 12px;
    margin-left: 6px;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.25s ease;
    position: relative;
    padding: 5px 0;
}

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

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

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

.header-btn {
    background: linear-gradient(135deg, #ff3b30 0%, #ff6b6b 100%);
    color: #ffffff !important;
    padding: 10px 24px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: bold;
    box-shadow: var(--shadow-red-glow);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.header-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(255, 59, 48, 0.5);
    background: linear-gradient(135deg, #ff4e50 0%, #ff7676 100%);
}

.mobile-toggle {
    display: none;
    font-size: 1.8rem;
    color: #fff;
    cursor: pointer;
}

/* Hero 英雄首屏 */
.hero {
    padding-top: 170px;
    padding-bottom: 100px;
    text-align: center;
    position: relative;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0, 242, 254, 0.12);
    border: 1px solid rgba(0, 242, 254, 0.35);
    color: var(--accent-cyan);
    padding: 6px 18px;
    border-radius: 30px;
    font-size: 0.95rem;
    margin-bottom: 25px;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.15);
}

.hero-tag .dot {
    width: 8px;
    height: 8px;
    background: var(--accent-emerald);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-emerald);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 0.4; transform: scale(0.9); }
    50% { opacity: 1; transform: scale(1.2); }
    100% { opacity: 0.4; transform: scale(0.9); }
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.25;
    font-weight: bold;
    margin-bottom: 22px;
    letter-spacing: 2px;
}

.hero-title span {
    background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #00f5d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 860px;
    margin: 0 auto 40px auto;
}

.hero-selling-points {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 45px;
}

.sp-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.sp-item:hover {
    background: rgba(0, 242, 254, 0.2);
    border-color: var(--accent-cyan);
    transform: translateY(-3px);
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-primary {
    background: linear-gradient(135deg, #ff3b30 0%, #ff6b6b 100%);
    color: #fff;
    padding: 16px 42px;
    font-size: 1.25rem;
    font-weight: bold;
    border-radius: 40px;
    text-decoration: none;
    box-shadow: 0 10px 30px rgba(255, 59, 48, 0.4);
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    letter-spacing: 1px;
}

.btn-primary:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 15px 40px rgba(255, 59, 48, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 16px 36px;
    font-size: 1.25rem;
    font-weight: bold;
    border-radius: 40px;
    text-decoration: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.22);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: translateY(-3px);
}

/* 状态统计浮动面板 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 60px;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.stat-card:hover {
    background: var(--card-hover-bg);
    border-color: var(--accent-cyan);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.stat-num {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--accent-cyan);
    margin-bottom: 5px;
    display: block;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 节点列表 Section */
.node-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.node-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.node-card:hover {
    background: var(--card-hover-bg);
    border-color: var(--accent-cyan);
    transform: translateY(-6px);
    box-shadow: var(--shadow-glow);
}

.node-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.node-flag {
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: bold;
}

.node-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--accent-emerald);
    background: rgba(0, 245, 212, 0.15);
    padding: 4px 10px;
    border-radius: 12px;
}

.node-ping {
    font-size: 0.95rem;
    font-weight: bold;
    color: var(--accent-gold);
    margin-bottom: 12px;
}

.node-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.node-tag {
    font-size: 0.8rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 3px 10px;
    border-radius: 8px;
    color: var(--text-secondary);
}

/* 套餐购买 Pricing Section */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.pricing-card {
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 38px 28px;
    position: relative;
    transition: all 0.35s ease;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    background: var(--card-hover-bg);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.pricing-card.featured {
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.15), rgba(66, 134, 244, 0.25));
    border: 2px solid var(--accent-cyan);
    box-shadow: var(--shadow-glow);
    transform: scale(1.03);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.popular-badge {
    position: absolute;
    top: -15px;
    right: 25px;
    background: linear-gradient(135deg, #ff3b30 0%, #ff9500 100%);
    color: #fff;
    padding: 5px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(255, 59, 48, 0.5);
}

.plan-title {
    font-size: 1.7rem;
    font-weight: bold;
    margin-bottom: 12px;
}

.plan-price {
    font-size: 2.8rem;
    font-weight: bold;
    color: var(--accent-cyan);
    margin-bottom: 20px;
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.plan-price span {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: normal;
}

.plan-features {
    list-style: none;
    margin-bottom: 30px;
    flex-grow: 1;
}

.plan-features li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.plan-features li strong {
    color: var(--text-primary);
}

.plan-features li i {
    color: var(--accent-emerald);
    font-size: 1.1rem;
}

.btn-buy {
    background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
    color: #0b132b;
    text-align: center;
    padding: 14px 20px;
    border-radius: 30px;
    font-size: 1.15rem;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.3s ease;
    display: block;
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.3);
}

.btn-buy:hover {
    background: linear-gradient(135deg, #00f5d4 0%, #00f2fe 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 242, 254, 0.5);
    color: #000;
}

.pricing-card.featured .btn-buy {
    background: linear-gradient(135deg, #ff3b30 0%, #ff6b6b 100%);
    color: #fff;
    box-shadow: var(--shadow-red-glow);
}

.pricing-card.featured .btn-buy:hover {
    background: linear-gradient(135deg, #ff4e50 0%, #ff7676 100%);
}

/* 下载中心 Download Center */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.download-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 28px;
    text-align: center;
    transition: all 0.3s ease;
}

.download-card:hover {
    background: var(--card-hover-bg);
    border-color: var(--accent-cyan);
    transform: translateY(-5px);
}

.dl-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    color: var(--accent-cyan);
}

.dl-title {
    font-size: 1.4rem;
    font-weight: bold;
    margin-bottom: 8px;
}

.dl-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.btn-dl {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 10px 22px;
    border-radius: 20px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: bold;
    display: inline-block;
    transition: all 0.3s ease;
}

.btn-dl:hover {
    background: var(--accent-cyan);
    color: #0b132b;
    box-shadow: var(--shadow-glow);
}

/* 使用教程 Tutorials Section */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 25px;
}

.tutorial-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    transition: all 0.3s ease;
}

.tutorial-card:hover {
    background: var(--card-hover-bg);
    border-color: var(--accent-cyan);
    transform: translateY(-5px);
}

.step-num {
    width: 38px;
    height: 38px;
    background: var(--accent-cyan);
    color: #0b132b;
    font-weight: bold;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

.t-title {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.t-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

/* 用户评价 Testimonials */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.review-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 28px;
    transition: all 0.3s ease;
}

.review-card:hover {
    background: var(--card-hover-bg);
    border-color: var(--accent-cyan);
}

.user-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ff3b30, #00f2fe);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.user-info .name {
    font-weight: bold;
    font-size: 1.1rem;
}

.user-info .role {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stars {
    color: var(--accent-gold);
    margin-bottom: 12px;
}

.review-text {
    color: var(--text-secondary);
    font-size: 1rem;
    font-style: italic;
}

/* FAQ 常见问题 accordion */
.faq-list {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.faq-item {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-question {
    padding: 22px 28px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
}

.faq-question:hover {
    color: var(--accent-cyan);
}

.faq-icon {
    font-size: 1.4rem;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--accent-cyan);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 28px;
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.7;
    border-top: 0px solid transparent;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 15px 28px 25px 28px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* 60+ 关键词标签库 (Tag Cloud) */
.tags-wrapper {
    background: rgba(0, 0, 0, 0.25);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 35px;
    margin-top: 30px;
}

.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.tag-pill {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-secondary);
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

.tag-pill:hover, .tag-pill.highlight {
    background: rgba(0, 242, 254, 0.2);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 242, 254, 0.25);
}

/* 文章推荐与内链组件 */
.articles-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 25px;
}

.article-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 28px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.article-card:hover {
    background: var(--card-hover-bg);
    border-color: var(--accent-cyan);
    transform: translateY(-5px);
}

.article-card h3 {
    font-size: 1.35rem;
    font-weight: bold;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.article-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.article-link {
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: bold;
    font-size: 1.05rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.article-link:hover {
    text-decoration: underline;
}

/* 页脚 Footer */
.footer {
    background: rgba(20, 23, 30, 0.95);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px 0;
    color: var(--text-muted);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-info p {
    margin-top: 15px;
    line-height: 1.7;
    font-size: 0.95rem;
}

.footer-col h4 {
    color: var(--text-primary);
    font-size: 1.15rem;
    font-weight: bold;
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.25s ease;
}

.footer-col ul li a:hover {
    color: var(--accent-cyan);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 25px;
    font-size: 0.9rem;
}

/* 响应式适配 */
@media (max-width: 992px) {
    .pricing-grid, .reviews-grid, .stats-grid {
        grid-template-columns: repeat(1, 1fr);
    }
    .pricing-card.featured {
        transform: none;
    }
    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .hero-title {
        font-size: 2.6rem;
    }
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: block;
    }
    .nav-links {
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background: rgba(35, 39, 48, 0.98);
        flex-direction: column;
        padding: 20px 30px;
        gap: 15px;
        display: none;
        border-bottom: 1px solid var(--border-color);
    }
    .nav-links.show {
        display: flex;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .hero-cta {
        flex-direction: column;
    }
    .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
}