/* ========================================
   三角洲陪玩网 - 极简暗色风格
   大量留白，内容为主，适合阅读
   ======================================== */

/* CSS 变量定义 */
:root {
    /* 暗色背景 */
    --color-bg: #111113;
    --color-bg-alt: #18181b;
    --color-bg-card: #1c1c20;
    
    /* 文字颜色 */
    --color-text: #e4e4e7;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    
    /* 强调色 */
    --color-accent: #a1a1aa;
    --color-link: #e4e4e7;
    
    /* 边框 */
    --color-border: #27272a;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", "PingFang SC", sans-serif;
    --font-size: 16px;
    --line-height: 1.8;
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    /* 容器 */
    --container: 1100px;
    --container-narrow: 720px;
}

/* ========================================
   基础重置
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size);
}

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

::selection {
    background: var(--color-text);
    color: var(--color-bg);
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
}

/* ========================================
   通用样式
   ======================================== */
.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-narrow {
    max-width: var(--container-narrow);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.7;
}

ul {
    list-style: none;
}

/* ========================================
   导航
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(17, 17, 19, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    gap: var(--space-md);
}

.nav-menu a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.nav-menu a:hover {
    color: var(--color-text);
    opacity: 1;
}

/* ========================================
   Hero
   ======================================== */
.hero {
    padding: calc(60px + var(--space-2xl)) 0 var(--space-2xl);
    border-bottom: 1px solid var(--color-border);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.5px;
    margin-bottom: var(--space-sm);
}

.hero p {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
}

/* ========================================
   通用区块
   ======================================== */
.section {
    padding: var(--space-2xl) 0;
}

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

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.section-desc {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.section-more {
    margin-top: var(--space-xl);
    text-align: center;
}

.btn-more {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    transition: all 0.2s;
}

.btn-more:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
    opacity: 1;
}

/* ========================================
   游戏介绍
   ======================================== */
.intro-lead {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.intro-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.feature h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.feature p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ========================================
   游戏攻略
   ======================================== */
.guides-featured {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.guide-featured {
    max-width: var(--container-narrow);
}

.guide-category {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}

.guide-featured h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.guide-featured p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: var(--space-md);
}

.guide-meta {
    display: flex;
    gap: var(--space-md);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.guide-link {
    font-size: 0.875rem;
    font-weight: 500;
}

.guides-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.guide-card {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.guide-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.guide-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
}

.guide-card .guide-meta {
    margin-bottom: var(--space-xs);
}

.guide-card .guide-link {
    font-size: 0.8rem;
}

/* ========================================
   陪玩项目
   ======================================== */
.services-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.service-item {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.service-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.service-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-xs);
}

.service-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.service-price {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.service-item > p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========================================
   价格
   ======================================== */
.pricing-table {
    margin-bottom: var(--space-lg);
}

.pricing-row {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9rem;
}

.pricing-header {
    color: var(--color-text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-row.featured {
    color: var(--color-text);
    font-weight: 500;
}

.pricing-notes {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 2;
}

/* ========================================
   优势
   ======================================== */
.advantages-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.advantage-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.advantage-item p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ========================================
   流程
   ======================================== */
.process-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.process-item {
    display: flex;
    gap: var(--space-md);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.process-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.process-num {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: 50%;
}

.process-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

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

/* ========================================
   FAQ
   ======================================== */
.faq-list {
    display: flex;
    flex-direction: column;
}

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

.faq-item summary {
    display: block;
    padding: var(--space-md) 0;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    list-style: none;
    position: relative;
    padding-right: 2rem;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-text-muted);
}

.faq-item[open] summary::after {
    content: '−';
}

.faq-answer {
    padding-bottom: var(--space-md);
}

.faq-answer p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
}

/* ========================================
   资讯
   ======================================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.news-card {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.news-tag {
    display: inline-block;
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--space-sm);
}

.news-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.news-card > p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-sm);
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.news-meta a {
    color: var(--color-text-secondary);
}

/* ========================================
   联系
   ======================================== */
.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.contact-item h3 {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.contact-item p {
    font-size: 1rem;
}

.contact-form {
    max-width: 500px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-text-muted);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.btn-submit {
    padding: 0.75rem 2rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-bg);
    background: var(--color-text);
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-submit:hover {
    opacity: 0.9;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    padding: var(--space-xl) 0 var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-xl);
}

.footer-brand .logo {
    display: block;
    margin-bottom: 0.5rem;
}

.footer-brand p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

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

/* ========================================
   响应式
   ======================================== */
@media (max-width: 900px) {
    .nav-menu {
        display: none;
    }
    
    .guides-grid,
    .news-grid,
    .advantages-list,
    .intro-features {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .footer-links {
        flex-wrap: wrap;
    }
}

@media (max-width: 600px) {
    .hero h1 {
        font-size: 1.75rem;
    }
    
    .pricing-row {
        grid-template-columns: 1fr;
        gap: var(--space-xs);
    }
    
    .pricing-header {
        display: none;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}