/* ==========================================================================
   寰宇云 (Huanyuyun.my) - 核心设计系统与样式表
   ========================================================================== */

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

:root {
    /* 颜色定义 - 深邃宇宙星空蓝 */
    --bg-main: #030712;
    --bg-card: rgba(10, 18, 38, 0.65);
    --bg-card-hover: rgba(16, 28, 58, 0.8);
    --primary: #0066ff;
    --primary-rgb: 0, 102, 255;
    --accent: #00f0ff;
    --accent-rgb: 0, 240, 255;
    --purple: #8b5cf6;
    --border: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(0, 240, 255, 0.3);
    
    /* 文本颜色 */
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;

    /* 字体定义 */
    --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* 阴影与光晕 */
    --glow-primary: 0 0 20px rgba(0, 102, 255, 0.25);
    --glow-accent: 0 0 25px rgba(0, 240, 255, 0.35);
    --glow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    /* 动画 transition */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* 动态背景画布 */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(circle at 50% 50%, #08112b 0%, #030712 100%);
}

/* 容器与布局 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: #ffffff;
}

.text-glow {
    text-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 30%, var(--accent) 70%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: rgba(3, 7, 18, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition-normal);
}

header.scrolled {
    background: rgba(3, 7, 18, 0.9);
    padding: 0.5rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.logo-img-wrapper {
    height: 36px;
    background: rgba(255, 255, 255, 0.95);
    padding: 4px 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--glow-accent);
    border: 1px solid rgba(0, 240, 255, 0.3);
}

.logo-img {
    height: 100%;
    width: auto;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent);
    text-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
}

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

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

.nav-btn {
    background: linear-gradient(135deg, var(--primary), #0044cc);
    color: #fff;
    padding: 0.6rem 1.5rem;
    border-radius: 9999px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--glow-primary);
    transition: var(--transition-normal);
}

.nav-btn:hover {
    background: linear-gradient(135deg, var(--accent), var(--primary));
    box-shadow: var(--glow-accent);
    transform: translateY(-2px);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    background: none;
    border: none;
}

.menu-toggle span {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    position: relative;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: rgba(0, 240, 255, 0.08);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 9999px;
    width: fit-content;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.2); opacity: 1; box-shadow: 0 0 12px var(--accent); }
    100% { transform: scale(0.9); opacity: 0.6; }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 580px;
}

.hero-cta {
    display: flex;
    gap: 1.2rem;
    margin-top: 1rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.9rem 2.2rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--primary));
    color: #030712;
    border: none;
    box-shadow: var(--glow-accent);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 35px rgba(0, 240, 255, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* 宇宙飞船或炫酷插图 */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-sphere {
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.2) 0%, rgba(0, 102, 255, 0.05) 70%, transparent 100%);
    border-radius: 50%;
    position: absolute;
    z-index: -1;
    filter: blur(20px);
    animation: rotate 20s linear infinite;
}

.hero-card-glow {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(0, 240, 255, 0.15);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--glow-card), 0 0 30px rgba(0, 102, 255, 0.1) inset;
    width: 100%;
    max-width: 380px;
    position: relative;
    transform: perspective(1000px) rotateY(-10deg) rotateX(10deg);
    transition: var(--transition-normal);
}

.hero-card-glow:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
    border-color: var(--accent);
    box-shadow: var(--glow-card), var(--glow-accent);
}

.speed-metric {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1.5rem;
}

.speed-metric:last-child {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.metric-val {
    font-size: 2rem;
    font-weight: 800;
    font-family: var(--font-heading);
    color: #ffffff;
    display: flex;
    align-items: baseline;
    gap: 0.2rem;
}

.metric-val span {
    font-size: 1rem;
    color: var(--accent);
    font-weight: 500;
}

/* Section 通用 */
section {
    padding: 6rem 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.section-subtitle {
    color: var(--accent);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* 核心优势特点 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-hover);
    box-shadow: var(--glow-card), 0 0 20px rgba(0, 240, 255, 0.05);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 102, 255, 0.1);
    border: 1px solid rgba(0, 102, 255, 0.3);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent);
    font-size: 1.5rem;
    transition: var(--transition-normal);
}

.feature-card:hover .feature-icon {
    background: var(--accent);
    color: #030712;
    box-shadow: var(--glow-accent);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.8rem;
}

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

/* 价格方案 Section */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.2rem;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3rem 2.2rem;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: var(--transition-normal);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.pricing-card.popular {
    border-color: var(--accent);
    box-shadow: var(--glow-card), 0 0 25px rgba(0, 102, 255, 0.15);
    background: linear-gradient(180deg, rgba(10, 25, 50, 0.8) 0%, rgba(3, 7, 18, 0.8) 100%);
    transform: scale(1.03);
}

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

.pricing-card.popular:hover {
    transform: scale(1.03) translateY(-8px);
    box-shadow: var(--glow-card), 0 0 35px rgba(0, 240, 255, 0.3);
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--accent), var(--primary));
    color: #030712;
    padding: 0.3rem 1.2rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--glow-accent);
}

.plan-name {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
    color: #ffffff;
}

.plan-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    min-height: 40px;
}

.plan-price {
    margin-bottom: 2rem;
    display: flex;
    align-items: baseline;
    font-family: var(--font-heading);
}

.plan-price .currency {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-right: 0.2rem;
}

.plan-price .amount {
    font-size: 3rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1;
}

.plan-price .period {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-left: 0.5rem;
}

.plan-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-grow: 1;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.plan-features li svg {
    flex-shrink: 0;
    color: var(--accent);
    width: 18px;
    height: 18px;
}

.plan-features li.disabled {
    color: var(--text-muted);
}

.plan-features li.disabled svg {
    color: var(--text-muted);
    opacity: 0.5;
}

.pricing-btn {
    width: 100%;
    text-align: center;
    padding: 1rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition-normal);
}

.pricing-btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--primary));
    color: #030712;
    box-shadow: var(--glow-accent);
}

.pricing-btn-primary:hover {
    box-shadow: 0 0 25px rgba(0, 240, 255, 0.5);
    transform: translateY(-2px);
}

.pricing-btn-secondary {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.pricing-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* 文章 Section */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.article-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--glow-card);
}

.article-image {
    width: 100%;
    height: 180px;
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.2), rgba(0, 240, 255, 0.05));
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.article-image::before {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.15) 0%, transparent 75%);
    animation: rotate 15s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.article-image-icon {
    font-size: 3rem;
    color: var(--accent);
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.6));
    z-index: 1;
}

.article-body {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.article-title {
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.4;
    transition: var(--transition-fast);
}

.article-title a {
    color: #ffffff;
    text-decoration: none;
}

.article-title a:hover {
    color: var(--accent);
}

.article-excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-more {
    margin-top: auto;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition-fast);
}

.article-more:hover {
    color: #ffffff;
}

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

.article-more:hover svg {
    transform: translateX(5px);
}

/* 用户评价 Section */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.review-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2.2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-normal);
}

.review-card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 240, 255, 0.2);
}

.review-stars {
    color: #fbbf24;
    display: flex;
    gap: 0.2rem;
    margin-bottom: 1.2rem;
}

.review-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.review-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.review-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #ffffff;
    font-size: 1.1rem;
    border: 2px solid var(--border);
}

.review-info h4 {
    font-size: 0.95rem;
    color: #ffffff;
}

.review-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 常见问题 FAQ Section */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.faq-question {
    width: 100%;
    padding: 1.5rem 2rem;
    background: none;
    border: none;
    color: #ffffff;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

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

.faq-icon {
    transition: var(--transition-normal);
    color: var(--text-secondary);
    flex-shrink: 0;
}

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

.faq-item.active {
    border-color: rgba(0, 240, 255, 0.2);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal) ease-out;
}

.faq-answer-content {
    padding: 0 2rem 1.8rem 2rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* CTA Banner Section */
.cta-banner {
    padding: 8rem 0;
    text-align: center;
}

.cta-box {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.15) 0%, rgba(0, 240, 255, 0.05) 100%);
    border: 1px solid rgba(0, 240, 255, 0.2);
    border-radius: 32px;
    padding: 5rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 40px rgba(0, 240, 255, 0.05) inset;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.08) 0%, transparent 60%);
    pointer-events: none;
}

.cta-box h2 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 1.2rem;
}

.cta-box p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem auto;
}

/* Footer 页脚 */
footer {
    background-color: #02050e;
    border-top: 1px solid var(--border);
    padding: 5rem 0 2.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.footer-desc {
    max-width: 320px;
    line-height: 1.7;
}

.footer-links h4 {
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

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

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

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-bottom p {
    color: var(--text-muted);
}

.footer-seo-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: right;
    max-width: 600px;
    line-height: 1.5;
}

/* ==========================================================================
   文章内页专用样式
   ========================================================================== */
.article-header-section {
    padding-top: 150px;
    padding-bottom: 3rem;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.article-meta-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
}

.article-meta-header span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-main-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 4rem;
    padding: 4rem 0;
}

.article-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    font-size: 1.05rem;
    line-height: 1.85;
    color: #e5e7eb;
}

.article-content p {
    margin-bottom: 1.8rem;
}

.article-content h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin: 2.5rem 0 1.2rem 0;
    color: #ffffff;
    border-left: 4px solid var(--accent);
    padding-left: 1rem;
}

.article-content h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin: 2rem 0 1rem 0;
    color: #ffffff;
}

.article-content ul, .article-content ol {
    margin-bottom: 1.8rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content strong {
    color: var(--accent);
}

.article-content a {
    color: var(--accent);
    text-decoration: underline;
    transition: var(--transition-fast);
}

.article-content a:hover {
    color: #ffffff;
}

.article-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-widget {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.sidebar-widget h4 {
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.8rem;
    color: #ffffff;
}

.sidebar-cta {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.2) 0%, rgba(0, 240, 255, 0.08) 100%);
    border-color: rgba(0, 240, 255, 0.25);
    text-align: center;
}

.sidebar-cta h4 {
    border-bottom: none;
    padding-bottom: 0;
    font-size: 1.3rem;
}

.sidebar-cta p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.sidebar-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.sidebar-links li {
    font-size: 0.9rem;
    line-height: 1.4;
}

.sidebar-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
    display: block;
}

.sidebar-links a:hover {
    color: var(--accent);
}

/* ==========================================================================
   响应式断点样式
   ========================================================================== */

@media (max-width: 1024px) {
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .pricing-card.popular:hover {
        transform: translateY(-8px);
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .hero-desc {
        margin: 0 auto;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-card-glow {
        transform: none;
        margin: 0 auto;
    }
    
    .hero-card-glow:hover {
        transform: translateY(-5px);
    }
    
    .article-layout {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .article-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(3, 7, 18, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        transition: var(--transition-normal);
        border-top: 1px solid var(--border);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-btn {
        width: 80%;
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-seo-meta {
        text-align: center;
    }
    
    .article-main-title {
        font-size: 2.2rem;
    }
    
    .article-content {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
    }
    
    .article-main-title {
        font-size: 1.8rem;
    }
}

/* PBN Friendly Links Styling */
.footer-pbn {
    width: 100%;
    text-align: center;
    margin-top: 1.5rem;
    border-top: 1px dashed var(--border);
    padding-top: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-pbn a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 10px;
    transition: var(--transition-fast);
}

.footer-pbn a:hover {
    color: var(--accent);
}