/*
Theme Name: 旺商聊
Theme URI: https://wangshangtalk.com.cn
Description: 轻量化 WordPress 智能客服 SaaS 官网首页主题 —— 纯原生 PHP + CSS + JS，不依赖任何第三方插件。浅蓝玻璃科技 UI，1:1 还原旺商聊官网首页。
Version: 1.0.0
Author: WorkBuddy
Requires at least: 6.0
Tested up to: 6.5
License: GPL v2 or later
Text Domain: wangshangtalk
*/

/* ==========================================================================
   1. 全局初始化与基础样式 (Reset & Base)  —— 来自 public.css
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    font-size: 16px;
}

/* ==========================================================================
   2. 公共布局组件 (Layout & Components)  —— 来自 public.css
   ========================================================================== */
.site-header {
    /* 吸顶前后保持固定高度，避免 padding 切换造成视觉闪动 */
    background-color: rgba(255, 255, 255, 0.85);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid #e5e5e5;
    padding: 14px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.site-header.is-sticky {
    /* 仅切背景色与阴影，padding 保持不变，header 高度恒定不抖 */
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 18px rgba(24, 128, 255, 0.10);
}

.header-content {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    position: relative;
}

/* Logo 样式 */
.site-logo {
    z-index: 2;
    flex-shrink: 0;
}

.site-logo .logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #333;
}

.logo-img {
    height: 40px;
    width: auto;
    margin-right: 10px;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: #333;
}

/* 导航包裹层（实现居中） */
.main-navigation {
    flex-grow: 1;
    display: flex;
    justify-content: flex-start;
}

/* 一级菜单容器 */
.main-navigation .nav-menu {
    display: flex;
    list-style: none;
    gap: 6px;
    margin: 0;
    padding: 0;
}

/* 一级菜单项 */
.main-navigation .nav-menu > li {
    position: relative;
    padding: 6px 0;
}

.main-navigation .nav-menu > li > a {
    text-decoration: none;
    color: #333;
    font-size: 16px;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: 8px;
    display: inline-block;
    transition: all 0.3s ease;
}

.main-navigation .nav-menu > li > a:hover,
.main-navigation .nav-menu > li.current-menu-item > a {
    color: #1880ff;
    background-color: rgba(24, 128, 255, 0.1);
}

/* 二级下拉菜单 */
.main-navigation .nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background-color: #ffffff;
    min-width: 180px;
    list-style: none;
    padding: 8px 0;
    margin: 0;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.02);
    border: 1px solid #e5e5e5;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    pointer-events: none;
}

.main-navigation .nav-menu li:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.main-navigation .nav-menu .sub-menu li {
    padding: 0;
    width: 100%;
}

.main-navigation .nav-menu .sub-menu li a {
    display: block;
    font-size: 15px;
    color: #475569;
    padding: 10px 20px;
    border-radius: 0;
    width: 100%;
    box-sizing: border-box;
}

.main-navigation .nav-menu .sub-menu li a:hover {
    color: #1880ff;
    background-color: #f0f7ff;
}

/* 头部 CTA 下载按钮 */
.header-cta {
    flex-shrink: 0;
    margin-left: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
    background-color: var(--color-primary, #2563EB);
    color: #fff;
    border: 2px solid var(--color-primary, #2563EB);
    text-decoration: none;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.header-cta:hover {
    background-color: var(--color-primary-dark, #1D4ED8);
    border-color: var(--color-primary-dark, #1D4ED8);
    color: #fff;
    transform: translateY(-1px);
}

/* 汉堡菜单按钮（移动端显示） */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    margin-left: 12px;
    padding: 0;
    background: transparent;
    border: 1px solid #e5e5e5;
    border-radius: 8px;
    cursor: pointer;
    flex-shrink: 0;
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    margin: 0 auto;
    background-color: #333;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   3. 全局底部样式 (Footer)  —— 来自 public.css
   ========================================================================== */
.site-footer {
    background: #0f172a;
    color: #fff;
    padding: 60px 0 30px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    clear: both;
    text-align: left;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    gap: 40px;
}

.footer-brand {
    flex: 1.2;
    min-width: 280px;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: #fff;
    margin: 0 0 15px;
    letter-spacing: -.5px;
}

.footer-slogan {
    font-size: 14px;
    color: #b0b0b0;
    max-width: 320px;
    margin: 0 0 20px;
    line-height: 1.8;
}

.footer-btn {
    display: inline-block;
    background: #1e88e5;
    color: #fff;
    padding: 10px 24px;
    border-radius: 999px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: .3s;
    box-shadow: 0 4px 14px rgba(30, 136, 229, .3);
}

.footer-btn:hover {
    background: #1565c0;
    transform: translateY(-1px);
}

.footer-nav-group {
    flex: 2;
    display: flex;
    flex-wrap: wrap;
    gap: 60px;
    justify-content: flex-end;
    min-width: 300px;
}

.footer-column {
    min-width: 120px;
}

.footer-column h4 {
    font-size: 16px;
    color: #fff;
    margin: 0 0 20px;
    font-weight: 600;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.footer-column a {
    color: #999;
    text-decoration: none;
    font-size: 14px;
    transition: .3s;
}

.footer-column a:hover {
    color: #fff;
}

/* 页脚导航项（span 替代 a，点击由 JS 处理） */
.footer-nav-item {
    color: #999;
    font-size: 14px;
    cursor: pointer;
    transition: .3s;
}
.footer-nav-item:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, .1);
    padding-top: 30px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    font-size: 13px;
    color: #666;
}

.footer-legal {
    display: flex;
    gap: 25px;
}

.footer-legal a {
    color: #666;
    text-decoration: none;
    transition: .3s;
}

.footer-legal a:hover {
    color: #999;
}

.secure-tag {
    color: #1e88e5;
    font-weight: 500;
}

/* ==========================================================================
   4. 首页样式（home.css 合并，精简复杂动画）
   ========================================================================== */
:root {
    --color-primary: #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-primary-light: #DBEAFE;
    --color-primary-bg: #EFF6FF;
    --color-text: #1E293B;
    --color-text-secondary: #475569;
    --color-text-light: #64748B;
    --color-heading: #0F172A;
    --color-white: #FFFFFF;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8FAFC;
    --color-bg-card: #FFFFFF;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --container-width: 1180px;
    --transition: 0.2s ease;
}

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

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

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

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3, h4 {
    color: var(--color-heading);
    line-height: 1.3;
    font-weight: 700;
}

h1 {
    font-size: 44px;
    letter-spacing: -0.5px;
    font-weight: 800;
}

h2 {
    font-size: 32px;
    letter-spacing: -0.3px;
}

h3 {
    font-size: 20px;
}

p {
    color: var(--color-text-secondary);
}

.section-title {
    text-align: center;
    margin-bottom: 56px;
    font-size: 32px;
    font-weight: 700;
    color: var(--color-heading);
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    text-align: center;
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border: 2px solid var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    display: inline-block;
    padding: 10px 28px;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    color: var(--color-primary);
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* SEO 锚点导航 */
.seo-anchor-nav {
    background-color: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
    backdrop-filter: saturate(180%) blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    padding: 12px 0;
    position: sticky;
    top: 73px;
    z-index: 900;
}

.seo-anchor-nav .container {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
}

.seo-anchor-nav a {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition);
}

.seo-anchor-nav a:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* 模块通用间距 */
.hero-section,
.features-section,
.download-section,
.about-section,
.faq-section,
.latest-posts-section,
.why-us-section,
.changelog-section {
    padding: 80px 0;
}

/* Hero 首屏 */
.hero-section {
    padding: 120px 0 100px;
    background:
        radial-gradient(circle at 85% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 15% 80%, rgba(29, 78, 216, 0.05) 0%, transparent 40%),
        linear-gradient(135deg, #F0F4FF 0%, #FFFFFF 50%, #F8FAFC 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--color-border-light) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border-light) 1px, transparent 1px);
    background-size: 40px 40px;
    mask-image: radial-gradient(circle at 50% 50%, black, transparent 80%);
    -webkit-mask-image: radial-gradient(circle at 50% 50%, black, transparent 80%);
    opacity: 0.4;
    pointer-events: none;
}

.hero-wrapper {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1.1;
    min-width: 0;
}

.hero-content h1 {
    font-size: 46px;
    font-weight: 800;
    color: var(--color-heading);
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -0.8px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 40px;
    line-height: 1.75;
    max-width: 540px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-cta .btn-primary {
    padding: 14px 36px;
    font-size: 16px;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.hero-cta .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.hero-cta .btn-secondary {
    padding: 14px 36px;
    font-size: 16px;
}

.hero-image {
    flex: 0.9;
    min-width: 0;
    position: relative;
}

.hero-image::after {
    content: "";
    position: absolute;
    width: 80%;
    height: 80%;
    background: var(--color-primary-light);
    bottom: -10px;
    right: -10px;
    z-index: -1;
    border-radius: var(--radius-lg);
    filter: blur(40px);
    opacity: 0.6;
}

.hero-image img {
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 50px rgba(15, 23, 42, 0.12);
    width: 100%;
    height: auto;
    border: 1px solid rgba(255, 255, 255, 0.8);
}

/* 为什么选择旺商聊 */
.why-us-section {
    background-color: var(--color-white);
}

.why-us-intro {
    text-align: center;
    font-size: 17px;
    color: var(--color-text-light);
    margin-top: -40px;
    margin-bottom: 48px;
    line-height: 1.6;
}

.why-us-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.why-us-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.why-us-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.why-us-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
    transform: translateY(-3px);
}

.why-us-card:hover::before {
    transform: scaleX(1);
}

.why-us-icon {
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.why-us-icon svg {
    flex-shrink: 0;
}

.why-us-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 10px;
    line-height: 1.3;
}

.why-us-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin: 0;
}

/* 核心功能 */
.features-section {
    background-color: var(--color-white);
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 64px;
    margin-bottom: 80px;
}

.feature-row:last-child {
    margin-bottom: 0;
}

.feature-row-reverse {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
    min-width: 0;
}

.feature-text h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 14px;
    padding-left: 16px;
    border-left: 3px solid var(--color-primary);
}

.feature-text p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.feature-media {
    flex: 1;
    min-width: 0;
}

.feature-media img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    width: 100%;
    height: auto;
    border: 1px solid var(--color-border-light);
}

/* 下载专区 */
.download-section {
    background-color: var(--color-bg-alt);
}

.download-intro {
    text-align: center;
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.download-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 36px 32px;
    text-align: center;
    transition: all var(--transition);
}

.download-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
    transform: translateY(-2px);
}

.download-card h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 8px;
}

.download-card p {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 24px;
}

.version-info {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}

.version-info h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 12px;
}

.version-info p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.version-info p + p {
    margin-top: 8px;
}

/* 社会证明 */
.social-proof {
    margin-top: 56px;
    padding-top: 48px;
    border-top: 1px solid var(--color-border-light);
}

.social-proof-stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    min-width: 140px;
}

.stat-number {
    display: block;
    font-size: 40px;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.1;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--color-text-light);
    font-weight: 500;
}

/* 客户评价轮播 */
.testimonial-carousel {
    position: relative;
    max-width: 820px;
    margin: 0 auto 24px;
    overflow: hidden;
}

.testimonial-track {
    display: flex;
    transition: transform 0.5s ease;
    will-change: transform;
}

.testimonial-item {
    flex: 0 0 100%;
    max-width: 100%;
    padding: 0 6px;
    box-sizing: border-box;
}

.testimonial-item-inner {
    background-color: var(--color-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 32px 36px;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.testimonial-item-inner::before {
    content: "\201C";
    position: absolute;
    top: 12px;
    left: 22px;
    font-size: 52px;
    line-height: 1;
    color: var(--color-primary-light);
    font-family: Georgia, "Times New Roman", serif;
    pointer-events: none;
}

.testimonial-item blockquote {
    margin: 0;
}

.testimonial-item blockquote p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-secondary);
    font-style: italic;
    margin-bottom: 16px;
    padding-top: 8px;
}

.testimonial-item blockquote footer {
    font-size: 13px;
    color: var(--color-text-light);
    font-style: normal;
    font-weight: 600;
}

.testimonial-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 8px;
}

.testimonial-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--color-border);
    border: none;
    padding: 0;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.testimonial-dot.active {
    background-color: var(--color-primary);
    transform: scale(1.2);
}

.social-proof-clients {
    text-align: center;
    margin-top: 40px;
}

.clients-label {
    font-size: 14px;
    color: var(--color-text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.client-logos {
    display: flex;
    justify-content: center;
    gap: 28px;
    flex-wrap: wrap;
    align-items: center;
}

.client-logo-placeholder {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    background-color: var(--color-white);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--color-text-light);
    font-weight: 500;
    transition: all var(--transition);
    min-width: 100px;
    cursor: default;
}

.client-logo-placeholder:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary);
    background-color: var(--color-primary-bg);
}

/* 关于旺商聊 */
.about-section {
    background-color: var(--color-white);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-secondary);
}

.about-text p + p {
    margin-top: 16px;
}

.about-contact {
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 32px;
}

.about-contact h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-heading);
    margin-bottom: 16px;
}

.about-contact ul {
    list-style: none;
    padding: 0;
}

.about-contact ul li {
    font-size: 15px;
    color: var(--color-text-secondary);
    padding: 8px 0;
    line-height: 1.6;
}

/* FAQ 常见问题（折叠手风琴） */
.faq-section {
    background-color: var(--color-bg-alt);
}

.faq-list {
    max-width: 780px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-border-light);
    transition: all var(--transition);
}

.faq-item:first-child {
    border-top: 1px solid var(--color-border-light);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: none;
    border: none;
    padding: 24px 8px;
    margin: 0;
    font-family: inherit;
    font-size: 17px;
    font-weight: 600;
    color: var(--color-heading);
    text-align: left;
    cursor: pointer;
    transition: color var(--transition);
}

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

.faq-question::before {
    content: "Q";
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 700;
}

.faq-question-text {
    flex: 1;
}

.faq-icon {
    position: relative;
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.faq-icon::before,
.faq-icon::after {
    content: "";
    position: absolute;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.faq-icon::before {
    top: 8px;
    left: 0;
    width: 18px;
    height: 2px;
}

.faq-icon::after {
    top: 0;
    left: 8px;
    width: 2px;
    height: 18px;
}

.faq-item.open .faq-icon::after {
    transform: scaleY(0);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease, opacity 0.3s ease, padding 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 400px;
    opacity: 1;
    padding: 0 8px 24px 34px;
}

.faq-answer p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin: 0;
}

/* 最新文章 */
.latest-posts-section {
    background-color: var(--color-white);
}

.posts-list {
    list-style: none;
    margin: 40px 0 0;
    padding: 0;
    border-top: 2px solid var(--color-border-light);
}

.post-list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border-light);
    transition: background-color var(--transition);
}

.post-list-item:hover {
    background-color: var(--color-bg-alt);
}

.post-item-title {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    flex: 1;
    padding-right: 20px;
}

.post-item-title a {
    color: var(--color-heading);
    transition: color var(--transition);
}

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

.post-item-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-shrink: 0;
    font-size: 14px;
    color: var(--color-text-light);
}

.post-item-date {
    color: var(--color-text-secondary);
}

.post-item-author {
    color: var(--color-text-light);
}

.posts-footer {
    margin-top: 32px;
    text-align: center;
}

.no-posts-message {
    text-align: center;
    padding: 40px 0;
    color: var(--color-text-light);
    font-size: 15px;
}

/* 更新日志 - 垂直时间轴（上下交替） */
.changelog-section {
    background-color: var(--color-white);
}

.changelog-intro {
    text-align: center;
    font-size: 17px;
    color: var(--color-text-light);
    margin-top: -40px;
    margin-bottom: 56px;
    line-height: 1.6;
}

.changelog-timeline {
    position: relative;
    max-width: 860px;
    margin: 0 auto;
    padding: 0 24px;
}

.changelog-timeline::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-primary);
    transform: translateX(-50%);
    border-radius: 1px;
    opacity: 0.5;
}

.timeline-entry {
    position: relative;
    display: flex;
    align-items: center;
    margin-bottom: 60px;
    width: 100%;
}

.timeline-entry:last-child {
    margin-bottom: 0;
}

.timeline-entry-card {
    width: 50%;
    padding: 0 56px 0 0;
    box-sizing: border-box;
}

.timeline-entry:nth-child(even) .timeline-entry-card {
    margin-left: 50%;
    padding: 0 0 0 56px;
}

.timeline-card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    position: relative;
}

.timeline-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
    transform: translateY(-3px);
}

.timeline-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.timeline-version {
    font-size: 15px;
    font-weight: 700;
    color: var(--color-primary);
    background-color: var(--color-primary-bg);
    padding: 2px 12px;
    border-radius: 20px;
    line-height: 1.6;
}

.timeline-latest-tag {
    font-size: 11px;
    font-weight: 700;
    color: var(--color-white);
    background-color: #22C55E;
    padding: 2px 10px;
    border-radius: 12px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    line-height: 1.6;
}

.timeline-date {
    display: block;
    font-size: 13px;
    color: var(--color-text-light);
    font-weight: 500;
    margin-bottom: 14px;
}

.timeline-updates {
    list-style: none;
    padding: 0;
    margin: 0;
}

.timeline-updates li {
    position: relative;
    padding-left: 16px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.timeline-updates li:last-child {
    margin-bottom: 0;
}

.timeline-updates li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    width: 5px;
    height: 5px;
    background-color: var(--color-primary-light);
    border-radius: 50%;
    transition: background-color 0.2s;
}

.timeline-card:hover .timeline-updates li::before {
    background-color: var(--color-primary);
}

.timeline-connector {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    z-index: 2;
}

.timeline-connector::before {
    content: "";
    width: 56px;
    height: 2px;
    background-color: var(--color-primary);
    opacity: 0.5;
    border-radius: 1px;
}

.timeline-dot {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 14px;
    height: 14px;
    background-color: var(--color-white);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    z-index: 3;
    flex-shrink: 0;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    transition: all 0.3s ease;
}

.timeline-entry:first-child .timeline-dot {
    width: 18px;
    height: 18px;
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.15);
}

.timeline-entry:hover .timeline-dot {
    border-color: var(--color-primary-dark);
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.18);
}

/* ==========================================================================
   5. 响应式设计
   ========================================================================== */

/* 中屏 & 平板端 (≤1024px) */
@media (max-width: 1024px) {
    .hero-section,
    .features-section,
    .download-section,
    .about-section,
    .faq-section,
    .latest-posts-section,
    .why-us-section,
    .changelog-section {
        padding: 64px 0;
    }

    .section-title {
        margin-bottom: 40px;
    }

    .hero-section {
        padding: 80px 0 60px;
    }
    .hero-section::before {
        display: none;
    }
    .hero-wrapper {
        flex-direction: column;
        gap: 40px;
    }
    .hero-content h1 {
        font-size: 40px;
    }
    .hero-subtitle {
        max-width: 100%;
    }
    .hero-image {
        order: -1;
    }

    .why-us-intro {
        margin-top: -28px;
        margin-bottom: 40px;
    }
    .why-us-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .feature-row,
    .feature-row-reverse {
        flex-direction: column;
        gap: 40px;
        margin-bottom: 56px;
    }
    .feature-row-reverse .feature-media {
        order: -1;
    }
    .feature-text h3 {
        font-size: 22px;
    }

    .download-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .social-proof {
        margin-top: 44px;
        padding-top: 36px;
    }
    .social-proof-stats {
        gap: 48px;
    }
    .stat-number {
        font-size: 34px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .seo-anchor-nav .container {
        gap: 20px;
    }
    .faq-list {
        max-width: 100%;
    }

    .changelog-intro {
        margin-top: -28px;
        margin-bottom: 44px;
    }
}

/* 移动端 (≤900px)：汉堡菜单 + 导航折叠 */
@media (max-width: 900px) {
    .header-content {
        justify-content: space-between;
    }
    .nav-toggle {
        display: flex;
    }
    .header-cta {
        margin-left: 8px;
        padding: 9px 16px;
        font-size: 14px;
    }
    .main-navigation {
        position: absolute;
        left: 0;
        right: 0;
        top: 100%;
        flex-grow: 0;
        background-color: #fff;
        box-shadow: 0 14px 30px rgba(0, 0, 0, 0.08);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        border-bottom-left-radius: 12px;
        border-bottom-right-radius: 12px;
    }
    .main-navigation.open {
        max-height: 82vh;
        overflow-y: auto;
    }
    .main-navigation .nav-menu {
        flex-direction: column;
        gap: 0;
        padding: 10px 20px 18px;
    }
    .main-navigation .nav-menu > li {
        width: 100%;
        padding: 0;
        border-bottom: 1px solid var(--color-border-light);
    }
    .main-navigation .nav-menu > li:last-child {
        border-bottom: none;
    }
    .main-navigation .nav-menu > li > a {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: 14px 8px;
        border-radius: 0;
    }
    .main-navigation .nav-menu > li > a:hover {
        background-color: transparent;
    }
    .main-navigation .nav-menu .sub-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        border: none;
        background: var(--color-bg-alt);
        display: none;
        padding: 4px 0 10px 12px;
        min-width: 0;
    }
    .main-navigation .nav-menu li.open > .sub-menu {
        display: block;
    }
    .main-navigation .nav-menu .sub-menu li a {
        padding: 10px 14px;
    }
}

/* 手机端 (≤768px) */
@media (max-width: 768px) {
    body {
        font-size: 15px;
        line-height: 1.65;
    }
    .container {
        padding: 0 20px;
    }

    h1 { font-size: 32px; letter-spacing: -0.3px; }
    h2, .section-title { font-size: 26px; letter-spacing: -0.2px; }
    h3 { font-size: 18px; }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 12px 24px;
        font-size: 15px;
        min-height: 48px;
    }
    .header-cta {
        width: auto;
        min-height: 0;
    }

    .hero-section,
    .features-section,
    .download-section,
    .about-section,
    .faq-section,
    .latest-posts-section,
    .why-us-section,
    .changelog-section {
        padding: 48px 0;
    }

    .hero-section {
        padding: 60px 0 40px;
    }
    .hero-content h1 {
        font-size: 28px;
        line-height: 1.3;
    }
    .hero-subtitle {
        font-size: 16px;
        margin-bottom: 32px;
    }
    .hero-cta {
        flex-direction: column;
        gap: 12px;
    }

    .seo-anchor-nav {
        padding: 8px 0;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
        top: 65px;
    }
    .seo-anchor-nav .container {
        flex-wrap: nowrap;
        gap: 16px;
        padding: 0 20px;
    }
    .seo-anchor-nav a {
        font-size: 13px;
        white-space: nowrap;
    }

    .why-us-intro {
        font-size: 15px;
        margin-top: -24px;
        margin-bottom: 32px;
    }
    .why-us-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .why-us-card {
        padding: 24px 20px;
    }
    .why-us-card h3 {
        font-size: 17px;
    }
    .why-us-card p {
        font-size: 14px;
    }
    .why-us-icon {
        margin-bottom: 16px;
    }
    .why-us-icon svg {
        width: 36px;
        height: 36px;
    }

    .feature-row,
    .feature-row-reverse {
        gap: 28px;
        margin-bottom: 40px;
    }
    .feature-text h3 {
        font-size: 20px;
        padding-left: 12px;
        border-left-width: 2px;
    }
    .feature-text p {
        font-size: 15px;
        line-height: 1.7;
    }
    .feature-media img {
        border-radius: var(--radius-sm);
    }

    .download-cards {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    .download-card {
        padding: 28px 24px;
    }
    .download-card h3 {
        font-size: 20px;
    }

    .social-proof {
        margin-top: 32px;
        padding-top: 32px;
    }
    .social-proof-stats {
        gap: 32px;
        margin-bottom: 36px;
    }
    .stat-item {
        min-width: 100px;
    }
    .stat-number {
        font-size: 28px;
    }
    .stat-label {
        font-size: 13px;
    }
    .testimonial-item-inner {
        padding: 24px 22px;
    }
    .testimonial-item blockquote p {
        font-size: 14px;
    }
    .client-logos {
        gap: 16px;
    }
    .client-logo-placeholder {
        padding: 10px 20px;
        font-size: 13px;
        min-width: 80px;
    }

    .faq-question {
        font-size: 15px;
        padding: 20px 4px;
    }
    .faq-item.open .faq-answer {
        padding-left: 30px;
        padding-right: 4px;
    }
    .faq-answer p {
        font-size: 14px;
    }

    .post-list-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding: 16px 0;
    }
    .post-item-title {
        padding-right: 0;
    }
    .post-item-meta {
        gap: 16px;
        font-size: 13px;
    }

    /* 时间轴 - 移动端 */
    .changelog-intro {
        font-size: 15px;
        margin-top: -24px;
        margin-bottom: 36px;
    }
    .changelog-timeline {
        padding: 0 12px 0 36px;
    }
    .changelog-timeline::before {
        left: 14px;
        transform: none;
    }
    .timeline-entry {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 32px;
    }
    .timeline-entry-card,
    .timeline-entry:nth-child(even) .timeline-entry-card {
        width: 100%;
        margin-left: 0;
        padding: 0 0 0 18px;
    }
    .timeline-connector {
        left: 14px;
        top: 20px;
        transform: none;
    }
    .timeline-connector::before {
        display: none;
    }
    .timeline-dot {
        left: 14px;
        top: 20px;
        transform: translate(-50%, -50%);
        width: 12px;
        height: 12px;
    }
    .timeline-entry:first-child .timeline-dot {
        width: 16px;
        height: 16px;
    }
    .timeline-card {
        padding: 16px 14px;
    }
    .timeline-version {
        font-size: 14px;
    }
    .timeline-updates li {
        font-size: 12px;
    }
}

/* 小屏手机端 (≤480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    h1 { font-size: 28px; }
    h2, .section-title { font-size: 22px; }

    .hero-content h1 { font-size: 24px; }
    .hero-subtitle { font-size: 15px; }
    .section-title { margin-bottom: 32px; }

    .hero-section,
    .features-section,
    .download-section,
    .about-section,
    .faq-section,
    .latest-posts-section,
    .why-us-section,
    .changelog-section {
        padding: 40px 0;
    }

    .why-us-intro {
        font-size: 14px;
        margin-top: -20px;
        margin-bottom: 28px;
    }
    .why-us-card {
        padding: 20px 16px;
    }
    .why-us-card h3 {
        font-size: 16px;
    }

    .download-card {
        padding: 24px 20px;
    }
    .download-card h3 {
        font-size: 18px;
    }

    .social-proof {
        margin-top: 28px;
        padding-top: 24px;
    }
    .social-proof-stats {
        gap: 20px;
    }
    .stat-number {
        font-size: 24px;
    }
    .stat-label {
        font-size: 12px;
    }
    .testimonial-item-inner {
        padding: 16px;
    }
    .testimonial-item blockquote p {
        font-size: 13px;
        line-height: 1.65;
    }
    .client-logo-placeholder {
        padding: 8px 16px;
        font-size: 12px;
        min-width: 70px;
    }

    .about-contact {
        padding: 24px;
    }

    .faq-question { font-size: 14px; }
    .faq-answer p { font-size: 13px; }

    .footer-container {
        padding: 0 16px;
    }
}

/* 横屏手机 */
@media (max-height: 896px) and (orientation: landscape) {
    .hero-section {
        padding: 32px 0 24px;
    }
    .hero-wrapper {
        gap: 32px;
    }
    .hero-content h1 {
        font-size: 28px;
    }
    .hero-subtitle {
        font-size: 14px;
        margin-bottom: 16px;
    }
}

/* 锚点跳转不被吸顶导航遮挡 */
.hero-section,
.why-us-section,
.features-section,
.download-section,
.about-section,
.faq-section,
.latest-posts-section,
.changelog-section {
    scroll-margin-top: 138px;
}

/* 无障碍：减少动画 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .download-card:hover,
    .post-list-item:hover,
    .faq-item:hover,
    .btn-primary:hover,
    .btn-secondary:hover,
    .why-us-card:hover,
    .timeline-card:hover,
    .testimonial-track,
    .post-card:hover {
        transform: none;
    }
}

/* ==========================================================================
   15. 内页通用 —— 页头 Hero（浅蓝渐变玻璃）、面包屑、标题
   ========================================================================== */
.page-hero {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #EFF6FF 0%, #E0F2FE 50%, #DBEAFE 100%);
    padding: 64px 0 56px;
}
.page-hero::before {
    content: "";
    position: absolute;
    top: -120px;
    right: -80px;
    width: 360px;
    height: 360px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.14), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.page-hero::after {
    content: "";
    position: absolute;
    bottom: -140px;
    left: -60px;
    width: 320px;
    height: 320px;
    background: radial-gradient(circle, rgba(24, 128, 255, 0.10), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.page-hero-inner {
    position: relative;
    z-index: 1;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
    font-size: 14px;
    color: var(--color-text-light);
}
.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
}
.breadcrumb a:hover {
    text-decoration: underline;
}
.breadcrumb .sep {
    color: var(--color-border);
}
.breadcrumb .current {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.page-hero-title {
    font-size: 38px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--color-heading);
    margin: 0 0 12px;
}
.page-hero-sub {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin: 0;
    max-width: 640px;
}

/* ==========================================================================
   16. 文章列表页（博客 / 分类 / 标签 / 搜索归档）
   ========================================================================== */
.archive-section {
    padding: 56px 0 72px;
    background-color: var(--color-bg);
}
.archive-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
    align-items: start;
}
.archive-main {
    min-width: 0;
}

.post-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
}
.post-card {
    display: flex;
    flex-direction: column;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.post-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}
.post-card-thumb {
    display: block;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, #E0F2FE 0%, #DBEAFE 100%);
    overflow: hidden;
}
.post-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.post-card-thumb--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
}
.post-card-thumb--placeholder svg {
    width: 52px;
    height: 52px;
    opacity: 0.55;
}
.post-card-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    padding: 22px 22px 24px;
}
.post-card-cat {
    align-self: flex-start;
    margin-bottom: 12px;
    padding: 3px 10px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    border-radius: 999px;
}
.post-card-title {
    margin: 0 0 10px;
    font-size: 19px;
    line-height: 1.4;
    font-weight: 700;
}
.post-card-title a {
    color: var(--color-heading);
    text-decoration: none;
    transition: color var(--transition);
}
.post-card-title a:hover {
    color: var(--color-primary);
}
.post-card-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--color-text-light);
}
.post-card-author {
    color: var(--color-text-light);
}
.post-card-excerpt {
    margin: 0 0 16px;
    flex: 1;
    font-size: 14.5px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.post-card-more {
    align-self: flex-start;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}
.post-card-more:hover {
    color: var(--color-primary-dark);
}

/* 侧边栏与小组件 */
.archive-sidebar {
    position: sticky;
    top: 90px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.widget {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}
.widget-title {
    margin: 0 0 14px;
    padding-bottom: 12px;
    font-size: 16px;
    font-weight: 700;
    color: var(--color-heading);
    border-bottom: 1px solid var(--color-border-light);
}
.widget-categories {
    list-style: none;
    margin: 0;
    padding: 0;
}
.widget-categories li {
    border-bottom: 1px dashed var(--color-border-light);
}
.widget-categories li:last-child {
    border-bottom: none;
}
.widget-categories a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}
.widget-categories a:hover {
    color: var(--color-primary);
}
.widget-categories .count {
    font-size: 12px;
    color: var(--color-text-light);
    background: var(--color-bg-alt);
    padding: 1px 8px;
    border-radius: 999px;
}
.widget-recent {
    list-style: none;
    margin: 0;
    padding: 0;
}
.widget-recent li {
    padding: 10px 0;
    border-bottom: 1px dashed var(--color-border-light);
}
.widget-recent li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.widget-recent a {
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}
.widget-recent a:hover {
    color: var(--color-primary);
}
.widget-cta {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1D4ED8 100%);
    border: none;
    color: #fff;
    text-align: center;
}
.widget-cta-title {
    margin: 0 0 8px;
    font-size: 17px;
    color: #fff;
    border: none;
    padding: 0;
}
.widget-cta-text {
    margin: 0 0 16px;
    font-size: 13.5px;
    color: rgba(255, 255, 255, 0.9);
}
.btn-cta-white {
    display: inline-block;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary-dark);
    background: #fff;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: transform var(--transition), box-shadow var(--transition);
}
.btn-cta-white:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
    color: var(--color-primary-dark);
}

/* 分页 */
.nav-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}
.nav-links a,
.nav-links span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition);
}
.nav-links a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary-light);
    background: var(--color-primary-bg);
}
.nav-links .current {
    color: #fff;
    background: var(--color-primary);
    border-color: var(--color-primary);
}

/* ==========================================================================
   17. 文章详情页（single）
   ========================================================================== */
.single-section {
    padding: 48px 0 72px;
    background-color: var(--color-bg-alt);
}
.single-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 40px;
    align-items: start;
}
.single-cats {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}
.single-cat {
    padding: 4px 12px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    border-radius: 999px;
    text-decoration: none;
}
.single-cat:hover {
    background-color: #c7e0fd;
}
.single-title {
    font-size: 34px;
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: -0.4px;
    color: var(--color-heading);
    margin: 0 0 14px;
}
.single-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--color-text-light);
}
.single-meta .dot {
    color: var(--color-border);
}
.single-content {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    min-width: 0;
}
.single-featured {
    margin: 0 0 28px;
}
.single-featured img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
}
.single-content h2 {
    margin: 34px 0 14px;
    font-size: 25px;
    font-weight: 700;
    color: var(--color-heading);
}
.single-content h3 {
    margin: 26px 0 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-heading);
}
.single-content p {
    margin: 0 0 16px;
    font-size: 16px;
    line-height: 1.85;
    color: var(--color-text-secondary);
}
.single-content ul,
.single-content ol {
    margin: 0 0 18px;
    padding-left: 22px;
    color: var(--color-text-secondary);
}
.single-content li {
    margin: 7px 0;
    line-height: 1.8;
}
.single-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.single-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 20px 0;
}
.single-content blockquote {
    margin: 22px 0;
    padding: 14px 18px;
    border-left: 4px solid var(--color-primary);
    background-color: var(--color-primary-bg);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}
.single-content blockquote p {
    margin: 0;
}
.single-content :not(pre) > code {
    padding: 2px 6px;
    font-size: 0.9em;
    color: var(--color-primary-dark);
    background-color: var(--color-primary-light);
    border-radius: 4px;
}
.single-content pre {
    margin: 20px 0;
    padding: 18px;
    overflow: auto;
    background-color: #0F172A;
    color: #E2E8F0;
    border-radius: var(--radius-md);
    font-size: 14px;
    line-height: 1.7;
}
.single-content pre code {
    color: inherit;
    background: none;
    padding: 0;
}
.single-content table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
    font-size: 15px;
}
.single-content th,
.single-content td {
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    text-align: left;
    color: var(--color-text-secondary);
}
.single-content th {
    background-color: var(--color-bg-alt);
    font-weight: 600;
    color: var(--color-heading);
}
.single-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 28px;
}
.single-tag {
    padding: 4px 12px;
    font-size: 13px;
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    border-radius: 999px;
    text-decoration: none;
}
.single-tag:hover {
    background-color: #c7e0fd;
}
.single-back {
    margin-top: 28px;
}
.related-posts {
    margin-top: 38px;
    padding-top: 28px;
    border-top: 1px solid var(--color-border-light);
}
.related-title {
    margin: 0 0 16px;
    font-size: 18px;
    font-weight: 700;
    color: var(--color-heading);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}
.related-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 18px;
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: border-color var(--transition), transform var(--transition);
}
.related-card:hover {
    border-color: var(--color-primary-light);
    transform: translateY(-2px);
}
.related-card-cat {
    align-self: flex-start;
    padding: 2px 9px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    border-radius: 999px;
}
.related-card-title {
    font-size: 15.5px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--color-heading);
}
.related-card-date {
    font-size: 13px;
    color: var(--color-text-light);
}
.single-sidebar {
    position: sticky;
    top: 90px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ==========================================================================
   17. 404 错误页
   ========================================================================== */
.error-hero {
    padding-bottom: 48px;
}

.error-section {
    padding: 64px 0 88px;
    background-color: var(--color-bg);
    background-image:
        radial-gradient(circle at 15% 12%, rgba(37, 99, 235, 0.08), transparent 45%),
        radial-gradient(circle at 88% 80%, rgba(24, 128, 255, 0.06), transparent 50%);
}

.error-card {
    max-width: 720px;
    margin: 0 auto;
    padding: 56px 56px 48px;
    text-align: center;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    backdrop-filter: saturate(180%) blur(8px);
    -webkit-backdrop-filter: saturate(180%) blur(8px);
    position: relative;
    overflow: hidden;
}

.error-card::before {
    content: "";
    position: absolute;
    top: -60px;
    right: -60px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.16), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.error-card::after {
    content: "";
    position: absolute;
    bottom: -80px;
    left: -50px;
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(24, 128, 255, 0.10), transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.error-card > * {
    position: relative;
    z-index: 1;
}

/* 大号 404 —— 三段式：4 / 表情 / 4 */
.error-code {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
    font-family: var(--font-family);
    font-weight: 800;
    line-height: 1;
}

.error-code-digit {
    font-size: 168px;
    letter-spacing: -8px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    text-shadow: 0 6px 24px rgba(37, 99, 235, 0.18);
    user-select: none;
}

.error-code-oops {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 128px;
    height: 128px;
    color: var(--color-primary);
    animation: error-oops-float 3.6s ease-in-out infinite;
}

.error-code-oops svg {
    width: 100%;
    height: 100%;
}

@keyframes error-oops-float {
    0%, 100% { transform: translateY(0) rotate(-2deg); }
    50%      { transform: translateY(-6px) rotate(2deg); }
}

/* 标题与描述 */
.error-title {
    margin: 0 0 14px;
    font-size: 26px;
    font-weight: 700;
    color: var(--color-heading);
    letter-spacing: -0.3px;
}

.error-desc {
    margin: 0 auto 32px;
    max-width: 480px;
    font-size: 15.5px;
    line-height: 1.85;
    color: var(--color-text-secondary);
}

/* 搜索框 */
.error-search {
    max-width: 480px;
    margin: 0 auto 32px;
}

.error-search-box {
    display: flex;
    align-items: center;
    background-color: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: 4px 4px 4px 16px;
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.error-search-box:focus-within {
    background-color: var(--color-bg-card);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.error-search-icon {
    width: 20px;
    height: 20px;
    color: var(--color-text-light);
    flex-shrink: 0;
    transition: color var(--transition);
}

.error-search-box:focus-within .error-search-icon {
    color: var(--color-primary);
}

.error-search-input {
    flex: 1;
    min-width: 0;
    border: none;
    background: transparent;
    padding: 10px 12px;
    font-family: var(--font-family);
    font-size: 15px;
    color: var(--color-text);
    outline: none;
}

.error-search-input::placeholder {
    color: var(--color-text-light);
}

/* 隐藏 WebKit 原生清除按钮，避免与图标重叠 */
.error-search-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

.error-search-btn {
    flex-shrink: 0;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-white);
    background-color: var(--color-primary);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition);
}

.error-search-btn:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
}

.error-search-btn:active {
    transform: translateY(0);
}

/* 操作按钮组 */
.error-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
}

.error-btn-primary,
.error-btn-back {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 156px;
    padding: 13px 26px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: transform var(--transition), background-color var(--transition), color var(--transition), box-shadow var(--transition);
}

.error-btn-primary {
    color: var(--color-white);
    background-color: var(--color-primary);
    border: 2px solid var(--color-primary);
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.22);
}

.error-btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 10px 22px rgba(37, 99, 235, 0.28);
}

.error-btn-back {
    color: var(--color-primary);
    background-color: var(--color-primary-light);
    border: 2px solid var(--color-primary-light);
}

.error-btn-back:hover {
    background-color: #BFDBFE;
    border-color: #BFDBFE;
    color: var(--color-primary-dark);
    transform: translateY(-2px);
}

.error-btn-primary svg,
.error-btn-back svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* 「您可能想看」导航 */
.error-suggest {
    max-width: 720px;
    margin: 36px auto 0;
    padding: 28px 32px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.error-suggest-title {
    margin: 0 0 16px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-light);
    letter-spacing: 0.5px;
    text-transform: none;
}

.error-suggest-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px 14px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.error-suggest-list a {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 12px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--color-text-secondary);
    background-color: var(--color-bg-alt);
    border: 1px solid transparent;
    border-radius: 8px;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}

.error-suggest-list a:hover {
    color: var(--color-primary);
    background-color: var(--color-primary-bg);
    border-color: var(--color-primary-light);
    transform: translateX(2px);
}

.error-suggest-list svg {
    width: 14px;
    height: 14px;
    color: var(--color-primary);
    flex-shrink: 0;
}

/* 底部联系提示 */
.error-tip {
    max-width: 720px;
    margin: 28px auto 0;
    text-align: center;
    font-size: 14px;
    line-height: 1.9;
    color: var(--color-text-light);
}

.error-tip-link {
    color: var(--color-primary);
    font-weight: 500;
    border-bottom: 1px dashed transparent;
    transition: border-color var(--transition), color var(--transition);
}

.error-tip-link:hover {
    color: var(--color-primary-dark);
    border-bottom-color: var(--color-primary-dark);
}

/* ==========================================================================
   18. 内页响应式
   ========================================================================== */
@media (max-width: 992px) {
    .error-card {
        padding: 44px 32px 36px;
    }
    .error-code-digit {
        font-size: 132px;
    }
    .error-code-oops {
        width: 100px;
        height: 100px;
    }
}
@media (max-width: 640px) {
    .error-section {
        padding: 40px 0 56px;
    }
    .error-card {
        padding: 36px 22px 28px;
        border-radius: var(--radius-md);
    }
    .error-code {
        gap: 4px;
        margin-bottom: 20px;
    }
    .error-code-digit {
        font-size: 96px;
        letter-spacing: -4px;
    }
    .error-code-oops {
        width: 72px;
        height: 72px;
    }
    .error-title {
        font-size: 22px;
    }
    .error-desc {
        font-size: 14.5px;
        margin-bottom: 26px;
    }
    .error-search {
        margin-bottom: 26px;
    }
    .error-search-box {
        padding: 4px 4px 4px 12px;
    }
    .error-search-input {
        padding: 9px 10px;
        font-size: 14.5px;
    }
    .error-search-btn {
        padding: 9px 18px;
        font-size: 14px;
    }
    .error-actions {
        flex-direction: column;
        width: 100%;
    }
    .error-btn-primary,
    .error-btn-back {
        width: 100%;
    }
    .error-suggest {
        padding: 22px 18px;
    }
    .error-suggest-list {
        grid-template-columns: minmax(0, 1fr);
    }
    .error-tip {
        font-size: 13.5px;
    }
}
@media (max-width: 992px) {
    .archive-layout,
    .single-layout {
        grid-template-columns: minmax(0, 1fr);
    }
    .archive-sidebar,
    .single-sidebar {
        position: static;
        order: 2;
    }
}
@media (max-width: 640px) {
    .page-hero {
        padding: 44px 0 38px;
    }
    .page-hero-title {
        font-size: 28px;
    }
    .post-grid {
        grid-template-columns: minmax(0, 1fr);
    }
    .single-content {
        padding: 24px 18px;
    }
    .single-title {
        font-size: 26px;
    }
    .related-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}