:root {
    --primary-color: #C0392B;
    --dark-color: #2C3E50;
    --light-color: #ECF0F1;
    --white-color: #FFFFFF;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--white-color);
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

a:hover {
    color: #e74c3c;
}

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

header {
    background-color: var(--white-color);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.main-nav, .dropdown-menu {
    list-style: none;
}

.main-nav {
    display: flex;
}

.main-nav > li {
    position: relative;
    margin-left: 2rem;
}

.main-nav a {
    color: var(--dark-color);
    font-weight: 500;
    padding: 0.5rem 0;
}

.main-nav > li > a {
    position: relative;
    padding-bottom: 0.5rem;
}

.main-nav > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.main-nav > li:hover > a::after {
    width: 100%;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white-color);
    border-radius: 5px;
    box-shadow: var(--shadow);
    min-width: 220px;
    padding: 0.5rem 0;
}

.main-nav li:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li {
    padding: 0.5rem 1rem;
}

.dropdown-menu li a {
    white-space: nowrap;
}

.dropdown-menu li:hover {
    background-color: var(--light-color);
}

.hero {
    position: relative;
    height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white-color);
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('assets/images/guangzhou-skyline-banner.jpg') no-repeat center center/cover;
}

.hero-content {
    max-width: 800px;
    padding: 0 2rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2rem;
}

.cta-button {
    background-color: var(--primary-color);
    color: var(--white-color);
    padding: 0.8rem 2rem;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.cta-button:hover {
    background-color: #e74c3c;
    color: var(--white-color);
    transform: translateY(-3px);
}

.featured-guides {
    padding: 4rem 5%;
    text-align: center;
}

.featured-guides h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.guides-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    text-align: left;
}

.card {
    background-color: var(--white-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 25px rgba(0,0,0,0.15);
}

.card-content {
    padding: 1.5rem;
}

.card h3 {
    margin-bottom: 0.5rem;
}

.card p {
    margin-bottom: 1rem;
    color: #555;
}

footer {
    background-color: var(--dark-color);
    color: var(--light-color);
    text-align: center;
    padding: 2rem 5%;
}

.footer-nav {
    margin-bottom: 1rem;
}

.footer-nav a {
    color: var(--light-color);
    margin: 0 1rem;
}

.footer-nav a:hover {
    text-decoration: underline;
}

.social-icons a {
    color: var(--light-color);
    font-size: 1.5rem;
    margin: 0 0.7rem;
}

/* Guangzhou Guide Page Styles
----------------------------------- */
.guide-page-container {
    max-width: 1200px; /* 适当加宽以容纳侧边栏 */
    margin: 0 auto;
    padding: 4rem 5%;
}

.guide-page-container h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    text-align: center;
    margin-bottom: 1rem;
}

.guide-intro {
    font-size: 1.1rem;
    text-align: center;
    color: #555;
    margin-bottom: 4rem; /* 增加标题和内容的间距 */
}

/* 侧边栏和主内容的网格布局 */
.guide-layout-grid {
    display: grid;
    /* 定义两列：左侧边栏240px，右侧内容占满剩余空间 */
    grid-template-columns: 240px 1fr;
    gap: 4rem; /* 两列之间的间距 */
}

/* 左侧侧边栏导航 */
.side-nav {
    position: sticky; /* 这是实现粘性定位的关键 */
    top: 120px; /* 距离顶部120px后开始固定，为顶部导航栏留出空间 */
    align-self: start; /* 确保它在网格区域的顶部对齐 */
    border-left: 3px solid var(--primary-color);
    padding-left: 1.5rem;
}

.side-nav h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.side-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column; /* 列表项垂直排列 */
    gap: 0.75rem; /* 列表项之间的间距 */
}

.side-nav ul a {
    font-weight: 500;
    display: block;
    padding: 0.25rem 0;
    color: #555;
    transition: color 0.2s ease;
}

.side-nav ul a:hover {
    color: var(--primary-color);
}

/* 指南内容板块 */
.guide-section {
    margin-bottom: 4rem;
    /* 当通过链接跳转时，在标题上方留出120px空间，防止被顶部导航栏遮挡 */
    scroll-margin-top: 120px;
}

.guide-section h2 {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-color);
}

.guide-section p {
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

/* 响应式设计：当屏幕宽度小于1024px时 */
@media (max-width: 1024px) {
    .guide-layout-grid {
        /* 取消网格布局，让侧边栏和主内容垂直堆叠 */
        grid-template-columns: 1fr;
        gap: 0; /* 取消间距 */
    }

    .side-nav {
        position: static; /* 取消粘性定位 */
        border-left: none;
        padding-left: 0;
        margin-bottom: 3rem;
        background-color: var(--light-color);
        padding: 1.5rem;
        border-radius: 8px;
    }
    
    .side-nav ul {
        /* 在小屏幕上变回网格，更节省空间 */
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }

    .guide-section {
        /* 调整小屏幕上的跳转边距 */
        scroll-margin-top: 100px;
    }
}

/* 相关文章链接卡片样式
----------------------------------- */
.related-articles-container {
    margin-top: 2.5rem; /* 与上方段落的间距 */
    margin-bottom: 1rem;
}

.article-link-card {
    display: flex; /* 使用 Flexbox 布局 */
    justify-content: space-between; /* 两端对齐 */
    align-items: center; /* 垂直居中 */
    
    background-color: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.25rem 1.5rem;
    
    text-decoration: none; /* 去掉链接下划线 */
    color: inherit; /* 继承父元素颜色 */
    
    transition: all 0.2s ease-in-out; /* 添加平滑过渡效果 */
}

.article-link-card:hover {
    border-color: var(--primary-color); /* 鼠标悬停时边框变色 */
    transform: translateY(-3px); /* 向上轻微移动 */
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08); /* 添加阴影 */
}

.article-link-card .article-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
}

.article-link-card .article-cta {
    font-size: 1rem;
    font-weight: 500;
    color: #555;
    white-space: nowrap; /* 防止文字换行 */
    margin-left: 1.5rem; /* 与标题的最小间距 */
}

/* About Us Page Styles
----------------------------------- */
.about-page-container {
    max-width: 800px; /* Keep text readable */
    margin: 0 auto;
    padding: 4rem 5%;
}

.about-content h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    text-align: center;
    color: var(--primary-color);
}

.about-content h2 {
    font-size: 1.5rem;
    text-align: center;
    color: #555;
    font-weight: 400;
    margin-bottom: 4rem;
}

.about-content h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--light-color);
    padding-bottom: 0.5rem;
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.9;
    margin-bottom: 1.5rem;
}

.about-content ul {
    list-style-position: inside;
    font-size: 1.1rem;
    line-height: 1.9;
    padding-left: 1rem;
}

.about-content li {
    margin-bottom: 0.75rem;
}

.about-content .signature {
    margin-top: 3rem;
    font-size: 1.1rem;
    font-style: italic;
    text-align: right;
    color: #333;
}

.about-content a {
    color: var(--primary-color);
    font-weight: 600;
}

/* Guide Service Page (Contact) Styles
----------------------------------- */
.guide-service-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 5%;
}

.guide-service-container h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.service-subtitle {
    font-size: 1.25rem;
    text-align: center;
    color: #555;
    margin-bottom: 3rem;
}

.service-intro-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.guide-service-container h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-color);
}

.service-highlights ul {
    list-style: none;
    padding-left: 0;
}

.service-highlights li {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.service-highlights li::before {
    content: '✔'; /* Checkmark symbol */
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.service-fee-info p, .service-contact p {
    font-size: 1.1rem;
    line-height: 1.8;
}

/* Simplified Contact Methods */
.contact-methods-simple {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.contact-item {
    border: 1px solid var(--light-color);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    background-color: #fcfcfc;
}

.contact-item h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.contact-item a, .contact-item p {
    font-size: 1.1rem;
    word-break: break-all;
    color: #333;
}

.contact-item a {
    text-decoration: none;
    font-weight: 600;
}

.contact-item a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Policy Page Styles
----------------------------------- */
.policy-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 5%;
}

.policy-container h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 3rem;
}

.policy-container section {
    margin-bottom: 3rem;
}

.policy-container h2 {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-color);
}

.policy-container h3 {
    font-size: 1.4rem;
    color: #333;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.policy-container p, .policy-container li {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #333;
    margin-bottom: 1rem;
}

.policy-container a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.policy-container a:hover {
    text-decoration: underline;
}

#copyright p:first-of-type {
    font-style: italic;
    color: #555;
}

/* ===================================
   5. Article & Content Styles
   =================================== */

/* Main Article Container
   - 为文章内容提供一个居中的、有最大宽度的容器
-------------------------------------------------- */
.article-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

/* Article Typography
   - 定义文章内标题、段落等元素的样式
-------------------------------------------------- */
.article-container h1 {
    font-size: 2.8rem;
    color: #2c3e50; /* 深蓝灰色 */
    border-bottom: 3px solid #ecf0f1; /* 浅灰色下划线 */
    padding-bottom: 1rem;
    margin-bottom: 2rem;
    line-height: 1.3;
}

.article-container h2 {
    font-size: 2.2rem;
    color: #2c3e50;
    margin-top: 3rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #dfe6e9; /* 更细的下划线 */
    padding-bottom: 0.5rem;
}

.article-container h3 {
    font-size: 1.6rem;
    color: #34495e; /* 稍浅的蓝灰色 */
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.article-container p {
    margin-bottom: 1.25rem;
}

/* Lists within Articles
-------------------------------------------------- */
.article-container ul {
    padding-left: 25px;
    margin-bottom: 1.5rem;
}

.article-container ul li {
    margin-bottom: 0.75rem; /* 增加列表项之间的间距 */
    padding-left: 0.5rem;
}

/* Table Styles
   - 适用于文章中所有的数据表格
-------------------------------------------------- */
.article-container table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07); /* 柔和的阴影 */
}

.article-container th,
.article-container td {
    border: 1px solid #ddd;
    padding: 12px 15px; /* 增加左右内边距 */
    text-align: left;
}

.article-container th {
    background-color: #f2f2f2;
    font-weight: 600; /* 字体加粗 */
    color: #333;
}

.article-container tr:nth-child(even) {
    background-color: #f9f9f9; /* 斑马条纹 */
}

/* Content Boxes & Reusable Components
   - 用于在文章中突出显示不同类型的信息
-------------------------------------------------- */
/* 蓝色信息框 (Pro-Tip) */
.info-box {
    background-color: #eaf8ff;
    border-left: 5px solid #3498db;
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}

.info-box h3 {
    margin-top: 0;
    color: #2980b9;
}

/* 黄色提示框 (General Tip) */
.tip-box {
    background-color: #fdf8e1;
    border-left: 5px solid #f1c40f;
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}

/* 橙色警告框 (Warning) */
.warning-box {
    background-color: #fdf2e9;
    border-left: 5px solid #e67e22;
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}

/* 红色紧急信息框 (Emergency) */
.emergency-box {
    background-color: #fbeee6;
    border: 1px solid #d9534f;
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    border-radius: 8px;
}

.emergency-box h3 {
    color: #d9534f;
    margin-top: 0;
}

/* FAQ Section
-------------------------------------------------- */
.faq-section {
    margin-top: 3rem;
}

.faq-item {
    border-bottom: 1px solid #ecf0f1;
    padding: 1.5rem 0;
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    font-weight: 700;
    color: #2c3e50;
    font-size: 1.1rem;
    margin: 0;
}

.faq-answer {
    margin: 0.75rem 0 0 0;
    color: #555;
    padding-left: 1rem;
}

/* Utility Styles
   - 用于特定文本格式的小工具类
-------------------------------------------------- */
/* 用于拼音或粤语发音 */
.cantonese-phrase {
    background-color: #ecf0f1;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
}

/* 用于突出显示中文术语 */
.chinese-term {
    font-weight: 600;
    color: #c0392b; /* 暗红色 */
}
/* ===================================
   7. Guide Page Layout (Left Nav + Right Content)
   =================================== */

/* Page container for guide-style pages
-------------------------------------------------- */
.guide-page-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.guide-page-container h1 {
    font-size: 3rem;
    color: #343a40;
}

.guide-intro {
    font-size: 1.2rem;
    color: #6c757d;
    max-width: 800px;
    margin-bottom: 3rem;
}

/* Two-column grid for side-nav and main content
-------------------------------------------------- */
.guide-layout-grid {
    display: grid;
    /* 左侧导航栏固定宽度，右侧内容占据剩余空间 */
    grid-template-columns: 240px 1fr;
    gap: 3rem; /* 两栏之间的间距 */
    align-items: flex-start;
}

/* Main content area on the right
-------------------------------------------------- */
.layout-main-content {
    min-width: 0; /* 防止内容溢出网格容器 */
}

/* Left-side navigation
-------------------------------------------------- */
.side-nav {
    position: sticky; /* 滚动时固定在屏幕上 */
    top: 2rem; /* 距离顶部的距离 */
    align-self: start; /* 确保它在网格区域的顶部 */
}

.side-nav h3 {
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #6c757d;
    margin: 0 0 1rem 0;
}

.side-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    border-left: 2px solid #e9ecef;
}

.side-nav li a {
    display: block;
    text-decoration: none;
    color: #343a40;
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    border-left: 2px solid transparent;
    margin-left: -2px; /* 与父级边框对齐 */
    transition: all 0.2s ease;
}

.side-nav li a:hover {
    color: #3498db;
    border-left-color: #3498db;
}

/* Responsive adjustments for the guide layout
-------------------------------------------------- */
@media (max-width: 992px) {
    .guide-layout-grid {
        grid-template-columns: 1fr; /* 在小屏幕上变为单栏 */
    }

    .side-nav {
        position: static; /* 取消固定定位 */
        margin-bottom: 2.5rem;
        border-bottom: 1px solid #dee2e6;
        padding-bottom: 1rem;
    }

    .side-nav ul {
        border-left: none;
    }

    .side-nav li a {
        margin-left: 0;
        border-left: none;
        padding-left: 0;
    }
    
    .side-nav li a:hover {
        border-left-color: transparent;
    }
}