/* ==========================================================================
   银河云机场 (Galaxy Cloud) - 核心样式文件
   风格：简洁银河科技风、卡片式布局、毛玻璃特效、渐变发光、响应式设计
   ========================================================================== */

/* 引入字体 */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
    --bg-dark: #d6e4ff;
    --bg-deep: #b9d2fb;
    --card-bg: rgba(255, 255, 255, 0.75);
    --card-border: rgba(30, 64, 150, 0.12);
    --card-border-hover: rgba(30, 64, 150, 0.35);
    
    --text-primary: #0a1e5c;
    --text-secondary: #1e3a6e;
    --text-muted: #3b5998;
    
    --primary: #2e5aac;
    --primary-glow: rgba(46, 90, 172, 0.2);
    --secondary: #1a3a8f;
    --secondary-glow: rgba(26, 58, 143, 0.15);
    --accent: #4a78cc;
    --glow-yellow: #d97706;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-sans: 'Outfit', 'Noto Sans SC', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* 动态背景画布 */
#starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(circle at 50% 50%, var(--bg-deep) 0%, var(--bg-dark) 100%);
}

/* 页面滚动条优化 */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: rgba(56, 189, 248, 0.2);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(56, 189, 248, 0.4);
}

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

/* 网格系统 & 布局容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.section {
    padding: 100px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

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

/* ==========================================================================
   Header 导航栏
   ========================================================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(214, 228, 255, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(2, 132, 199, 0.1);
    z-index: 100;
    transition: var(--transition-normal);
}

header.scrolled {
    background: rgba(214, 228, 255, 0.95);
    box-shadow: 0 10px 30px -10px rgba(18, 30, 75, 0.15);
    padding: 12px 0;
    border-bottom: 1px solid rgba(2, 132, 199, 0.08);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo span {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-icon {
    width: 30px;
    height: 30px;
    position: relative;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #56c1ff 10%, #0c1a40 80%, #030614 100%);
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.6), inset -2px -2px 6px rgba(0, 0, 0, 0.8), inset 2px 2px 6px rgba(255, 255, 255, 0.4);
    display: inline-block;
    vertical-align: middle;
}

/* 动态光环 - 前半段 */
.logo-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 44px;
    height: 12px;
    border: 2px solid rgba(129, 140, 248, 0.85);
    border-top-color: transparent;
    border-radius: 50%;
    transform: translate(-50%, -50%) rotate(-20deg);
    box-shadow: 0 2px 8px rgba(129, 140, 248, 0.4);
    animation: orbitPulse 3s ease-in-out infinite alternate;
    z-index: 2;
}

/* 动态光环 - 后半段 */
.logo-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 44px;
    height: 12px;
    border: 2px solid rgba(129, 140, 248, 0.4);
    border-bottom-color: transparent;
    border-radius: 50%;
    transform: translate(-50%, -50%) rotate(-20deg);
    z-index: -1;
}

@keyframes orbitPulse {
    0% {
        transform: translate(-50%, -50%) rotate(-20deg) scale(0.96);
        filter: drop-shadow(0 0 1px rgba(56, 189, 248, 0.4));
    }
    100% {
        transform: translate(-50%, -50%) rotate(-20deg) scale(1.04);
        filter: drop-shadow(0 0 6px rgba(56, 189, 248, 0.7));
    }
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: var(--transition-normal);
}

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

.nav-cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #fff;
    font-weight: 600;
    padding: 10px 22px;
    border-radius: 50px;
    box-shadow: 0 0 15px var(--primary-glow);
    transition: var(--transition-normal);
    font-size: 0.9rem;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 25px var(--primary-glow), 0 0 10px var(--secondary-glow);
    color: #fff;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-normal);
}

/* ==========================================================================
   Hero 英雄区域
   ========================================================================== */
.hero {
    position: relative;
    padding-top: 180px;
    padding-bottom: 100px;
    min-height: 85vh;
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 24px;
}

.hero-content h1 span.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    display: inline-block;
}

.hero-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 580px;
}

.hero-ctas {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 600;
    padding: 14px 32px;
    border-radius: 12px;
    transition: var(--transition-normal);
    gap: 8px;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    box-shadow: 0 8px 30px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px var(--primary-glow);
}

.btn-secondary {
    background: rgba(18, 30, 75, 0.05);
    border: 1px solid rgba(18, 30, 75, 0.1);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(18, 30, 75, 0.08);
    border-color: var(--primary);
    transform: translateY(-3px);
}

/* 核心视觉图 */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.space-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 30px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    width: 100%;
    max-width: 440px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.4);
    position: relative;
    overflow: hidden;
    transition: var(--transition-slow);
}

.space-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.space-card:hover {
    transform: translateY(-8px) rotateY(5deg);
    border-color: var(--card-border-hover);
    box-shadow: 0 30px 60px rgba(56, 189, 248, 0.15);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.card-badge {
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.2);
    color: var(--primary);
    padding: 6px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.speed-meter {
    text-align: center;
    margin: 30px 0;
    position: relative;
}

.speed-value {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.speed-unit {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.card-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    border-top: 1px solid rgba(18, 30, 75, 0.08);
    padding-top: 20px;
}

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

.stat-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-lbl {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ==========================================================================
   卡片式核心优势
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 40px 30px;
    border-radius: 20px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 18px rgba(56, 189, 248, 0.08); /* 自动外发光 */
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--card-border-hover);
    box-shadow: 0 0 25px rgba(56, 189, 248, 0.25), 0 0 10px rgba(129, 140, 248, 0.15); /* 悬停外发光增强 */
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.1) 0%, rgba(129, 140, 248, 0.05) 100%);
    border: 1px solid rgba(56, 189, 248, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 24px;
    transition: var(--transition-normal);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.12); /* 图标本身自动外发光 */
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.2) 0%, rgba(129, 140, 248, 0.15) 100%);
    border-color: var(--primary);
    box-shadow: 0 0 25px rgba(56, 189, 248, 0.4);
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
}

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

/* ==========================================================================
   价格推荐模块
   ========================================================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 40px 30px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: relative;
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(56, 189, 248, 0.05); /* 自动外发光 */
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--card-border-hover);
    box-shadow: 0 20px 40px rgba(129, 140, 248, 0.2);
}

/* 热门推荐高亮 */
.pricing-card.popular {
    border-color: rgba(56, 189, 248, 0.4);
    box-shadow: 0 10px 30px rgba(56, 189, 248, 0.12); /* 自动外发光更强 */
}

.pricing-card.popular::before {
    content: 'HOT / 推荐';
    position: absolute;
    top: 20px;
    right: -35px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 40px;
    transform: rotate(45deg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.pricing-card h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.pricing-card .price-traffic {
    font-size: 0.95rem;
    color: var(--primary);
    font-weight: 600;
    background: rgba(56, 189, 248, 0.08);
    align-self: flex-start;
    padding: 4px 12px;
    border-radius: 50px;
    margin-bottom: 24px;
    border: 1px solid rgba(56, 189, 248, 0.15);
}

.pricing-card .price-row {
    margin-bottom: 24px;
}

.pricing-card .price-box {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.pricing-card .currency {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.pricing-card .amount {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1;
    color: var(--text-primary);
}

.pricing-card .period {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-left: 4px;
}

.pricing-card .alternative-price {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 6px;
}

.pricing-card .features-list {
    list-style: none;
    margin-bottom: 35px;
    flex-grow: 1;
}

.pricing-card .features-list li {
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.pricing-card .features-list li svg {
    color: var(--primary);
    flex-shrink: 0;
}

.pricing-card .pricing-btn {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    font-weight: 600;
    text-align: center;
    background: rgba(18, 30, 75, 0.04);
    border: 1px solid rgba(18, 30, 75, 0.1);
    color: var(--text-primary);
    transition: var(--transition-normal);
    display: block;
    box-shadow: 0 0 12px rgba(0, 176, 255, 0.2); /* 自动外发光 */
}

.pricing-card:hover .pricing-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 0 20px rgba(0, 176, 255, 0.45), 0 0 10px rgba(124, 58, 237, 0.25);
    transform: translateY(-2px);
}

.pricing-card.popular .pricing-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 0 15px rgba(0, 176, 255, 0.35);
}

.pricing-card.popular:hover .pricing-btn {
    box-shadow: 0 0 30px rgba(0, 176, 255, 0.7), 0 0 15px rgba(124, 58, 237, 0.4);
    transform: translateY(-2px);
}

/* ==========================================================================
   使用教程模块
   ========================================================================== */
.tutorial-tabs-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 30px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.tutorial-tabs {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 12px;
    margin-bottom: 40px;
    border-bottom: 1px solid rgba(18, 30, 75, 0.08);
    padding-bottom: 20px;
    flex-wrap: wrap;
}

.tab-btn {
    background: rgba(18, 30, 75, 0.03);
    border: 1px solid rgba(18, 30, 75, 0.08);
    color: var(--text-secondary);
    padding: 10px 24px;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--text-primary);
    border-color: rgba(56, 189, 248, 0.4);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 15px var(--primary-glow);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.steps-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}

.step-card {
    background: rgba(18, 30, 75, 0.03);
    border: 1px solid rgba(18, 30, 75, 0.06);
    border-radius: 16px;
    padding: 24px;
    transition: var(--transition-normal);
}

.step-card:hover {
    background: rgba(18, 30, 75, 0.04);
    border-color: rgba(56, 189, 248, 0.2);
}

.step-num {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
}

.step-card h4 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==========================================================================
   科学上网文章展示
   ========================================================================== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 30px;
}

.article-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
}

.article-card:hover {
    transform: translateY(-6px);
    border-color: var(--card-border-hover);
    box-shadow: 0 15px 35px rgba(56, 189, 248, 0.1);
}

.article-img-placeholder {
    display: none;
}

.article-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    gap: 16px;
}

.article-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.article-card:hover .article-content h3 {
    color: var(--primary);
}

.article-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
    flex-grow: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    color: var(--primary);
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.read-more svg {
    transition: var(--transition-fast);
}

.article-card:hover .read-more svg {
    transform: translateX(4px);
}

/* ==========================================================================
   常见问题模块 & 答疑
   ========================================================================== */
.faq-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    margin-bottom: 16px;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-normal);
}

.faq-item:hover {
    border-color: rgba(56, 189, 248, 0.3);
}

.faq-question {
    padding: 22px 28px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) cubic-bezier(0, 1, 0, 1);
    background: rgba(0, 0, 0, 0.15);
}

.faq-answer-inner {
    padding: 24px 28px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-top: 1px solid rgba(18, 30, 75, 0.06);
}

.faq-icon {
    transition: var(--transition-normal);
    color: var(--text-muted);
}

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

.faq-item.active .faq-answer {
    max-height: 1000px;
    transition: max-height var(--transition-normal) cubic-bezier(1, 0, 1, 0);
}

/* ==========================================================================
   用户评价模块
   ========================================================================== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 30px;
}

.review-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 30px;
    border-radius: 20px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-normal);
}

.review-card:hover {
    border-color: var(--card-border-hover);
    transform: translateY(-3px);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #030614;
    font-size: 1.1rem;
}

.review-user-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
}

.review-user-info span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.review-stars {
    color: var(--glow-yellow);
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.review-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ==========================================================================
   关于我们
   ========================================================================== */
.about-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 60px 40px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 50px;
    align-items: center;
}

.about-content h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 1rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.about-stat-card {
    background: rgba(18, 30, 75, 0.03);
    border: 1px solid rgba(18, 30, 75, 0.06);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
}

.about-stat-card h4 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 4px;
}

.about-stat-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.about-graphic {
    position: relative;
    display: flex;
    justify-content: center;
}

.orbital-animation {
    width: 250px;
    height: 250px;
    border: 1px dashed rgba(56, 189, 248, 0.15);
    border-radius: 50%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.orbital-sun {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--secondary) 0%, var(--primary) 100%);
    box-shadow: 0 0 30px var(--primary-glow);
}

.orbital-planet {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent);
    position: absolute;
    top: -10px;
    left: calc(50% - 10px);
    transform-origin: 10px 135px;
    animation: orbit 12s linear infinite;
    box-shadow: 0 0 10px rgba(167, 139, 250, 0.5);
}

@keyframes orbit {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ==========================================================================
   独立文章详情页专用样式
   ========================================================================== */
.article-page {
    padding-top: 140px;
    padding-bottom: 80px;
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 40px;
    align-items: start;
}

.article-main {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 24px;
    padding: 40px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.article-header {
    border-bottom: 1px solid rgba(18, 30, 75, 0.1);
    padding-bottom: 24px;
    margin-bottom: 30px;
}

.article-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.article-body {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.article-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--text-primary);
    border-left: 4px solid var(--primary);
    padding-left: 12px;
}

.article-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: 24px;
}

.article-body ul, .article-body ol {
    margin-bottom: 24px;
    padding-left: 20px;
}

.article-body li {
    margin-bottom: 8px;
}

.article-body strong {
    color: var(--text-primary);
}

.article-body a.keyword-link {
    color: var(--primary);
    font-weight: 600;
    border-bottom: 1px dashed var(--primary);
}

.article-body a.keyword-link:hover {
    color: var(--secondary);
    border-bottom-style: solid;
}

.article-cta-box {
    margin: 40px 0;
    padding: 30px;
    background: linear-gradient(135deg, rgba(0, 176, 255, 0.08) 0%, rgba(124, 58, 237, 0.05) 100%);
    border: 1px dashed rgba(0, 176, 255, 0.3);
    border-radius: 16px;
    text-align: center;
}

.article-cta-box p {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* 侧边栏 */
.article-sidebar {
    position: sticky;
    top: 100px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar-widget {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 24px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.sidebar-widget h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
    border-bottom: 1px solid rgba(18, 30, 75, 0.08);
    padding-bottom: 10px;
}

.sidebar-widget ul {
    list-style: none;
}

.sidebar-widget li {
    margin-bottom: 12px;
    font-size: 0.9rem;
}

.sidebar-widget li a {
    color: var(--text-secondary);
    display: block;
    line-height: 1.4;
}

.sidebar-widget li a:hover {
    color: var(--primary);
}

.promo-widget {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.8) 0%, rgba(214, 228, 255, 0.9) 100%);
    border: 1px solid rgba(2, 132, 199, 0.1);
    text-align: center;
}

.promo-widget p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* ==========================================================================
   Footer 页脚
   ========================================================================== */
footer {
    background: #b9d2fb;
    border-top: 1px solid rgba(2, 132, 199, 0.08);
    padding: 80px 0 30px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.footer-logo span {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-desc {
    margin-bottom: 20px;
    line-height: 1.5;
}

.footer-column h4 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.footer-links {
    list-style: none;
}

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

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

.footer-subscribe p {
    margin-bottom: 16px;
    line-height: 1.5;
}

.subscribe-form {
    display: flex;
    gap: 10px;
}

.subscribe-form input {
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(2, 132, 199, 0.15);
    padding: 10px 16px;
    border-radius: 8px;
    color: var(--text-primary);
    flex-grow: 1;
    font-size: 0.9rem;
}

.subscribe-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.subscribe-form button {
    background: var(--primary);
    border: none;
    padding: 0 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.subscribe-form button:hover {
    background: var(--secondary);
    transform: translateY(-1px);
}

.footer-bottom {
    border-top: 1px solid rgba(2, 132, 199, 0.08);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.8rem;
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

/* ==========================================================================
   媒体查询 (响应式适配)
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-content h1 {
        font-size: 3rem;
    }
    .about-wrapper {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .about-graphic {
        display: none; /* 在移动端/小平板折叠图形 */
    }
    .article-layout {
        grid-template-columns: 1fr;
    }
    .article-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 60px 0;
    }
    .section-title h2 {
        font-size: 2rem;
    }
    .hero {
        padding-top: 120px;
        padding-bottom: 60px;
    }
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-ctas {
        justify-content: center;
    }
    .hero-visual {
        order: -1; /* 图形排到上面 */
    }
    .space-card {
        margin: 0 auto;
    }
    
    /* 移动端导航栏折叠 */
    .menu-toggle {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(214, 228, 255, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 40px;
        transition: var(--transition-normal);
        z-index: 99;
    }
    .nav-menu.active {
        left: 0;
    }
    .nav-wrapper {
        position: relative;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

/* ==========================================================================
   实时测速卡片 - 动态星际与状态指示灯
   ========================================================================== */
.speed-planet-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, #38bdf8 0%, #0c1a40 80%, #030614 100%);
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.4), inset -2px -2px 6px rgba(0, 0, 0, 0.8), inset 2px 2px 6px rgba(255, 255, 255, 0.4);
    position: relative;
}

.speed-planet-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 90px;
    height: 24px;
    border: 1.5px solid rgba(56, 189, 248, 0.4);
    border-radius: 50%;
    background: radial-gradient(circle at 50% 0%, #38bdf8 0%, #38bdf8 4px, transparent 5px);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
    transform: translate(-50%, -50%) rotate(-15deg);
    animation: rotateOrbit 6s linear infinite;
}

@keyframes rotateOrbit {
    0% { transform: translate(-50%, -50%) rotate(-15deg); }
    100% { transform: translate(-50%, -50%) rotate(345deg); }
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    position: relative;
    display: inline-block;
    box-shadow: 0 0 8px #22c55e;
}

.status-dot::after {
    content: '';
    position: absolute;
    top: -4px;
    left: -4px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid #22c55e;
    opacity: 0;
    animation: statusPulse 2s cubic-bezier(0.24, 0, 0.38, 1) infinite;
}

@keyframes statusPulse {
    0% { transform: scale(0.5); opacity: 0; }
    50% { opacity: 0.8; }
    100% { transform: scale(1.8); opacity: 0; }
}