/*
 * 一分机场品牌官网核心样式系统 (Light Theme)
 * 极致性价比，专业简洁，支持多设备响应式
 */

/* ==========================================================================
   1. 基础配置与 CSS 变量
   ========================================================================== */
:root {
    --primary: #2563eb;          /* 科技深蓝 */
    --primary-hover: #1d4ed8;    /* 深蓝悬停 */
    --primary-light: #eff6ff;    /* 淡蓝背景 */
    --secondary: #0f172a;        /* 深灰黑（主标题与文字） */
    --accent: #f43f5e;           /* 红色警示/热销标签 */
    --background: #f8fafc;       /* 整体底色（Slate-50） */
    --surface: #ffffff;          /* 卡片背景 */
    --text-main: #334155;        /* 主要正文（Slate-700） */
    --text-muted: #64748b;       /* 次要描述（Slate-500） */
    --border-color: #e2e8f0;     /* 边框线（Slate-200） */
    --border-light: #f1f5f9;     /* 极淡边框线（Slate-100） */
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-premium: 0 20px 25px -5px rgba(37, 99, 235, 0.03), 0 8px 10px -6px rgba(37, 99, 235, 0.03);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
    font-family: var(--font-sans);
    font-size: 16px;
    color: var(--text-main);
    background-color: var(--background);
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* ==========================================================================
   2. 布局通用组件 (Layout Utilities)
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-bg {
    background-color: var(--surface);
}

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

.theme-gradient {
    background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
    font-weight: 700;
}

.section-title-wrapper {
    max-width: 700px;
    margin: 0 auto 50px auto;
}

.section-title {
    font-size: 2.25rem;
    color: var(--secondary);
    font-weight: 800;
    margin-top: 10px;
    line-height: 1.3;
}

.section-subtitle {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 700;
    color: var(--primary);
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.125rem;
    margin-top: 15px;
}

/* ==========================================================================
   3. 头部导航 (Header & Navigation)
   ========================================================================== */
.header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
    background-color: rgba(255, 255, 255, 0.95);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--secondary);
}

.logo svg {
    width: 32px;
    height: 32px;
    fill: var(--primary);
}

.nav {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-main);
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary);
    color: var(--surface);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 15px rgba(37, 99, 235, 0.3);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 1.5px solid var(--primary);
}

.btn-outline:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--secondary);
    color: var(--surface);
}

.btn-secondary:hover {
    background-color: #1e293b;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.1rem;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
    stroke: var(--secondary);
}

/* ==========================================================================
   4. 移动端抽屉式菜单 (Mobile Menu Drawer)
   ========================================================================== */
.mobile-drawer {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background-color: var(--surface);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.mobile-drawer.open {
    right: 0;
}

.mobile-drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close-btn {
    background: none;
    border: none;
    cursor: pointer;
}

.close-btn svg {
    width: 24px;
    height: 24px;
    stroke: var(--secondary);
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mobile-nav-link {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--secondary);
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light);
}

.mobile-nav-link:hover {
    color: var(--primary);
    padding-left: 5px;
}

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1999;
    display: none;
}

.drawer-overlay.show {
    display: block;
}

/* ==========================================================================
   5. 首页首屏介绍 (Hero Section)
   ========================================================================== */
.hero {
    position: relative;
    padding: 100px 0 80px 0;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 60px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background-color: var(--primary-light);
    color: var(--primary);
    font-size: 0.875rem;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 24px;
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.hero-tag .dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(37, 99, 235, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0); }
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--secondary);
    line-height: 1.15;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-main);
    line-height: 1.7;
    margin-bottom: 36px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
    width: 100%;
}

.hero-stat-item {
    display: flex;
    flex-direction: column;
}

.hero-stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
}

.hero-stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.hero-graphic {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 抽象科技风格网格背景与交互插画 */
.hero-illustration {
    position: relative;
    width: 100%;
    max-width: 480px;
    height: 380px;
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    padding: 30px;
    overflow: hidden;
}

.hero-illustration::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 30%, rgba(37, 99, 235, 0.05) 0%, transparent 60%);
    pointer-events: none;
}

.hero-window-header {
    display: flex;
    gap: 6px;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 15px;
}

.hero-window-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.hero-window-dot.red { background-color: #ef4444; }
.hero-window-dot.yellow { background-color: #eab308; }
.hero-window-dot.green { background-color: #22c55e; }

.hero-window-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.hero-node-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--background);
    padding: 12px 18px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
}

.hero-node-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.hero-node-flag {
    width: 24px;
    height: 16px;
    border-radius: 2px;
    object-fit: cover;
}

.hero-node-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--secondary);
}

.hero-node-ping {
    font-size: 0.875rem;
    color: #10b981;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
}

.hero-node-ping::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: #10b981;
    border-radius: 50%;
}

.hero-illustration-speed {
    margin-top: 10px;
    text-align: center;
}

.hero-illustration-speed-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-speed-bar {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 10px;
    margin-top: 8px;
    position: relative;
    overflow: hidden;
}

.hero-speed-bar-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 92%;
    background: linear-gradient(90deg, var(--primary) 0%, #10b981 100%);
    border-radius: 10px;
    animation: loadSpeed 2.5s ease-out infinite alternate;
}

@keyframes loadSpeed {
    0% { width: 40%; }
    100% { width: 92%; }
}

/* ==========================================================================
   6. 核心优势 (Features Section)
   ========================================================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(37, 99, 235, 0.2);
    transform: translateY(-6px);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background-color: var(--primary);
    transition: var(--transition);
}

.feature-card:hover::before {
    height: 100%;
}

.feature-icon-wrapper {
    width: 56px;
    height: 56px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.feature-icon-wrapper svg {
    width: 28px;
    height: 28px;
    stroke: currentColor;
    stroke-width: 2px;
}

.feature-card h3 {
    font-size: 1.35rem;
    color: var(--secondary);
    margin-bottom: 12px;
    font-weight: 700;
}

.feature-card p {
    color: var(--text-main);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==========================================================================
   7. 套餐价格 (Pricing Section)
   ========================================================================== */
.pricing-info-alert {
    background-color: var(--primary-light);
    border: 1px solid rgba(37, 99, 235, 0.1);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    max-width: 900px;
    margin: 0 auto 40px auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
    text-align: left;
}

.pricing-info-alert li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    color: var(--text-main);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1050px;
    margin: 0 auto;
}

.pricing-card {
    background-color: var(--surface);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 30px;
    position: relative;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.pricing-card.popular {
    border-color: var(--primary);
    box-shadow: var(--shadow-premium);
    transform: scale(1.03);
}

.pricing-card.popular:hover {
    transform: translateY(-4px) scale(1.03);
}

.pricing-card:hover {
    border-color: rgba(37, 99, 235, 0.3);
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.badge-hot {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: var(--accent);
    color: var(--surface);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 100px;
    letter-spacing: 0.05em;
}

.pricing-plan-name {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 8px;
}

.pricing-plan-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 24px;
    min-height: 40px;
}

.pricing-price-box {
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 24px;
}

.pricing-price-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 8px;
}

.pricing-price-label {
    font-size: 0.9rem;
    color: var(--text-main);
}

.pricing-price-val {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--secondary);
}

.pricing-price-val span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 2px;
}

.pricing-features-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 36px;
    text-align: left;
    flex-grow: 1;
}

.pricing-features-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.925rem;
    color: var(--text-main);
}

.pricing-features-list svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: #10b981;
    stroke-width: 3px;
    flex-shrink: 0;
    margin-top: 2px;
}

.pricing-features-list .disabled-item {
    color: var(--text-muted);
    text-decoration: line-through;
    opacity: 0.6;
}

.pricing-features-list .disabled-item svg {
    stroke: var(--text-muted);
}

/* ==========================================================================
   8. 适合人群 (Target Audience)
   ========================================================================== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.audience-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.audience-card:hover {
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.audience-avatar {
    width: 72px;
    height: 72px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.audience-avatar svg {
    width: 32px;
    height: 32px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2px;
}

.audience-card h4 {
    font-size: 1.2rem;
    color: var(--secondary);
    margin-bottom: 10px;
    font-weight: 700;
}

.audience-card p {
    color: var(--text-main);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* ==========================================================================
   9. 简易配置教程 (Step-by-step Tutorials Tab)
   ========================================================================== */
.tutorial-wrapper {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.tutorial-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background-color: #fafbfc;
}

.tab-btn {
    flex: 1;
    padding: 20px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--primary);
    background-color: var(--primary-light);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background-color: var(--surface);
}

.tab-content {
    padding: 40px;
    display: none;
}

.tab-content.active {
    display: block;
}

.step-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.step-item {
    display: flex;
    gap: 20px;
}

.step-num {
    width: 32px;
    height: 32px;
    background-color: var(--primary);
    color: var(--surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.step-body {
    flex-grow: 1;
}

.step-body h5 {
    font-size: 1.15rem;
    color: var(--secondary);
    margin-bottom: 8px;
    font-weight: 700;
}

.step-body p {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.6;
    margin-bottom: 12px;
}

.code-box {
    background-color: #0f172a;
    color: #e2e8f0;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    font-family: monospace;
    font-size: 0.875rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 10px 0;
}

.btn-copy {
    background: rgba(255, 255, 255, 0.1);
    color: var(--surface);
    border: none;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-copy:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ==========================================================================
   10. 用户评价 (Testimonials Section)
   ========================================================================== */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.testimonial-text {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-main);
    font-style: italic;
    margin-bottom: 24px;
}

.testimonial-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar-circle {
    width: 48px;
    height: 48px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.user-info h5 {
    font-size: 0.95rem;
    color: var(--secondary);
    font-weight: 700;
}

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

/* ==========================================================================
   11. 常见问题手风琴 (FAQ Accordion Component)
   ========================================================================== */
.faq-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.faq-header {
    width: 100%;
    padding: 22px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
}

.faq-question {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--secondary);
}

.faq-icon {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: var(--text-muted);
    stroke-width: 2.5px;
    transition: var(--transition);
}

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

.faq-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-content-inner {
    padding: 0 28px 22px 28px;
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.6;
}

/* ==========================================================================
   12. 文章目录/列表 (Blog Catalog Component)
   ========================================================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.blog-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.blog-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(37, 99, 235, 0.2);
}

.blog-thumb {
    width: 100%;
    height: 200px;
    background-color: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-color);
}

.blog-thumb svg {
    width: 64px;
    height: 64px;
    stroke: var(--primary);
    opacity: 0.7;
}

.blog-card-content {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

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

.blog-category {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
    padding: 2px 10px;
    border-radius: 100px;
}

.blog-card-content h3 {
    font-size: 1.25rem;
    color: var(--secondary);
    margin-bottom: 12px;
    font-weight: 700;
    line-height: 1.4;
}

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

.blog-excerpt {
    font-size: 0.9rem;
    color: var(--text-main);
    line-height: 1.5;
    margin-bottom: 20px;
    flex-grow: 1;
}

.blog-readmore {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.blog-readmore:hover {
    color: var(--primary-hover);
}

.blog-readmore svg {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    stroke-width: 2.5px;
    fill: none;
    transition: var(--transition);
}

.blog-readmore:hover svg {
    transform: translateX(4px);
}

/* ==========================================================================
   13. 页脚 (Footer Section)
   ========================================================================== */
.footer {
    background-color: #0f172a;
    color: #94a3b8;
    padding: 80px 0 40px 0;
    border-top: 1px solid #1e293b;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--surface);
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-logo svg {
    width: 32px;
    height: 32px;
    fill: var(--surface);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-col h4 {
    font-size: 1rem;
    color: var(--surface);
    font-weight: 700;
    margin-bottom: 24px;
    position: relative;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 24px;
    height: 2px;
    background-color: var(--primary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--surface);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.85rem;
}

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

.footer-legal-links a:hover {
    color: var(--surface);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background-color: var(--primary);
    color: var(--surface);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-hover);
    transform: translateY(-3px);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.5px;
}

/* ==========================================================================
   14. 文章详情内页样式 (Single Post Template Styles)
   ========================================================================== */
.post-layout {
    display: grid;
    grid-template-columns: 2.2fr 0.8fr;
    gap: 40px;
    padding: 50px 0;
}

.post-article {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 50px;
    box-shadow: var(--shadow-sm);
}

.post-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 30px;
    margin-bottom: 30px;
}

.post-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.post-breadcrumb a:hover {
    color: var(--primary);
}

.post-title {
    font-size: 2.5rem;
    color: var(--secondary);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 20px;
}

.post-meta-info {
    display: flex;
    gap: 24px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.post-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.post-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-main);
}

.post-content p {
    margin-bottom: 24px;
}

.post-content h2 {
    font-size: 1.75rem;
    color: var(--secondary);
    font-weight: 800;
    margin: 40px 0 20px 0;
    padding-left: 14px;
    border-left: 4px solid var(--primary);
    line-height: 1.3;
}

.post-content h3 {
    font-size: 1.35rem;
    color: var(--secondary);
    font-weight: 700;
    margin: 30px 0 15px 0;
}

.post-content ul, .post-content ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.post-content ul {
    list-style-type: disc;
}

.post-content ol {
    list-style-type: decimal;
}

.post-content li {
    margin-bottom: 8px;
}

.post-content strong {
    color: var(--secondary);
}

/* 文章内部突出框/引用块 */
.post-content blockquote {
    background-color: var(--primary-light);
    border-left: 4px solid var(--primary);
    padding: 20px 24px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 30px 0;
    font-style: italic;
    color: var(--secondary);
}

/* 面包屑分隔符 */
.breadcrumb-separator {
    opacity: 0.5;
}

/* 侧边栏样式 */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar-widget {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow-sm);
}

.sidebar-widget-title {
    font-size: 1.2rem;
    color: var(--secondary);
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-light);
}

.sidebar-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-link-item {
    font-size: 0.95rem;
    color: var(--text-main);
    line-height: 1.4;
}

.sidebar-link-item a:hover {
    color: var(--primary);
}

.sidebar-cta-widget {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: var(--surface);
    border: none;
    text-align: center;
}

.sidebar-cta-widget h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    font-weight: 800;
}

.sidebar-cta-widget p {
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 24px;
    line-height: 1.5;
}

/* 文章尾部相关推荐与版权 */
.post-footer {
    margin-top: 50px;
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
}

.post-share {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.post-tags {
    display: flex;
    gap: 10px;
}

.post-tag {
    font-size: 0.85rem;
    background-color: var(--background);
    color: var(--text-muted);
    padding: 4px 12px;
    border-radius: 100px;
}

.post-recommendations {
    margin-top: 40px;
}

.post-recommendations-title {
    font-size: 1.5rem;
    color: var(--secondary);
    font-weight: 700;
    margin-bottom: 24px;
}

.post-recommendations-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.recommend-card {
    background-color: var(--surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: var(--transition);
}

.recommend-card:hover {
    border-color: rgba(37, 99, 235, 0.2);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.recommend-card h4 {
    font-size: 1.05rem;
    color: var(--secondary);
    margin-bottom: 8px;
    font-weight: 700;
    line-height: 1.4;
}

.recommend-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ==========================================================================
   15. 响应式布局媒体查询 (Responsive Design)
   ========================================================================== */
@media (max-width: 992px) {
    .nav {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }
    .hero-content {
        align-items: center;
    }
    .hero h1 {
        font-size: 2.75rem;
    }
    .hero-cta {
        justify-content: center;
    }
    .hero-stats {
        justify-content: center;
    }
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }
    .pricing-card.popular {
        transform: none;
    }
    .pricing-card.popular:hover {
        transform: translateY(-6px);
    }
    .post-layout {
        grid-template-columns: 1fr;
    }
    .sidebar {
        margin-top: 40px;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 50px 0;
    }
    .section-title {
        font-size: 1.75rem;
    }
    .hero h1 {
        font-size: 2.25rem;
    }
    .hero-desc {
        font-size: 1.05rem;
    }
    .hero-stats {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .tutorial-tabs {
        flex-direction: column;
    }
    .tab-btn {
        border-bottom: none;
        border-left: 3px solid transparent;
        padding: 14px 20px;
        justify-content: flex-start;
    }
    .tab-btn.active {
        border-left-color: var(--primary);
    }
    .tab-content {
        padding: 24px;
    }
    .post-article {
        padding: 30px 20px;
    }
    .post-title {
        font-size: 1.85rem;
    }
    .post-recommendations-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}