/* ============================================
   哈呀酷官网 共用样式表
   HayaCool Website - Shared Stylesheet
   v2.1 品牌色回归：深绿 → 蓝紫渐变
   ============================================ */

/* CSS 变量 */
:root {
    /* v2.1 品牌色回归：哈呀！的灵光——蓝紫渐变（与 logo 一致） */
    /* 起点（哈呀 H，天蓝）→ 中段（意识涌现临界）→ 终点（Cool，深紫） */
    --color-primary: #5B6BD9;
    /* 蓝紫（中段，作为可复用的纯色） */
    --color-primary-gradient-start: #4A8FE7;
    /* 哈呀 H：天蓝 */
    --color-primary-gradient-end: #7B3FE4;
    /* Cool：深紫 */
    --color-primary-light: #8593E5;
    /* hover 态（变浅） */
    --color-primary-dark: #4A55B8;
    /* 文字/边框态（变深） */
    --color-bg: #faf8f3;
    /* 浅米白背景 */
    --color-text: #1a1a1a;
    --color-text-light: #555;
    --color-accent: #d97a3e;
    /* 暖橙强调色 */
    --color-border: #e0dcd0;

    --font-serif-zh: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "宋体", serif;
    --font-sans-zh: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-sans-en: "Inter", -apple-system, sans-serif;

    --max-width: 900px;
    --spacing: 2rem;
}

/* 品牌色渐变（仅用于装饰：标题、强调边框、特殊块） */
.gradient-primary {
    background: linear-gradient(135deg, var(--color-primary-gradient-start) 0%, var(--color-primary-gradient-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* 全局样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans-zh), var(--font-sans-en);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom 0.2s;
}

a:hover {
    border-bottom: 1px solid var(--color-primary);
}

/* 容器 */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.container-wide {
    max-width: 1100px;
    margin: 0 auto;
}

/* 导航栏 */
.navbar {
    border-bottom: 1px solid var(--color-border);
    background: rgba(250, 248, 243, 0.95);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-family: var(--font-serif-zh);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    border: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.navbar-brand:hover {
    border: none;
}

/* Navbar Logo */
.navbar-logo {
    height: 40px;
    width: auto;
    display: block;
}

.navbar-nav {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.navbar-nav a {
    color: var(--color-text);
    font-size: 0.95rem;
    border: none;
}

.navbar-nav a:hover {
    color: var(--color-primary);
    border: none;
}

.navbar-nav a.active {
    color: var(--color-primary);
    font-weight: 500;
}

/* 主标题区 */
.hero {
    padding: 6rem 1.5rem 4rem;
    text-align: center;
}

.hero h1 {
    font-family: var(--font-serif-zh);
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.hero h2 {
    font-size: 1.5rem;
    color: var(--color-text);
    font-weight: normal;
    margin-bottom: 2rem;
}

.hero .lead {
    font-size: 1.15rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto 3rem;
    line-height: 2;
}

.hero-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    margin-bottom: 2rem;
}

/* 三大支柱 */
.pillars {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 4rem 0;
}

@media (max-width: 768px) {
    .pillars {
        grid-template-columns: 1fr;
    }
}

.pillar {
    padding: 2rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-align: left;
}

.pillar-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.pillar-title {
    font-family: var(--font-serif-zh);
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.pillar-content {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.pillar-link {
    margin-top: 1rem;
    display: inline-block;
    color: var(--color-accent);
    font-size: 0.9rem;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--color-primary-light);
    border: none;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
    border: 1px solid var(--color-primary);
}

.btn-large {
    padding: 1rem 3rem;
    font-size: 1.1rem;
}

.btn-row {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 2rem 0;
}

/* 章节标题 */
.section-title {
    font-family: var(--font-serif-zh);
    font-size: 1.75rem;
    color: var(--color-primary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-subtitle {
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 3rem;
    font-size: 1.05rem;
}

/* 内容块 */
.content-block {
    margin: 4rem 0;
}

.content-block h2 {
    font-family: var(--font-serif-zh);
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.content-block h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin: 2rem 0 0.75rem;
}

.content-block p {
    margin-bottom: 1.25rem;
    color: var(--color-text);
}

/* 引用 */
.quote {
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    background: white;
    border-left: 4px solid var(--color-accent);
    font-family: var(--font-serif-zh);
    font-size: 1.05rem;
    color: var(--color-text);
    line-height: 1.9;
}

/* 公式框 */
.formula-box {
    background: white;
    border: 2px solid var(--color-primary);
    border-radius: 8px;
    padding: 2rem;
    margin: 2.5rem 0;
    text-align: center;
}

.formula-box h3 {
    color: var(--color-primary);
    margin-bottom: 1rem;
    font-family: var(--font-serif-zh);
}

.formula-box .formula {
    font-size: 1.25rem;
    font-family: "Cambria Math", "Latin Modern Math", serif;
    color: var(--color-text);
    margin: 1rem 0;
    overflow-x: auto;
}

.formula-box .formula-note {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-top: 1rem;
    line-height: 1.7;
}

/* 时间线 */
.timeline {
    margin: 3rem 0;
}

.timeline-item {
    padding: 1rem 0 1rem 2rem;
    border-left: 2px solid var(--color-border);
    margin-left: 1rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -7px;
    top: 1.25rem;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
}

.timeline-time {
    color: var(--color-text-light);
    font-size: 0.9rem;
    font-family: var(--font-sans-en), monospace;
}

.timeline-event {
    color: var(--color-text);
    font-weight: 500;
    margin: 0.25rem 0;
}

/* 文章卡片 */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 3rem 0;
}

@media (max-width: 768px) {
    .article-grid {
        grid-template-columns: 1fr;
    }
}

.article-card {
    padding: 2rem;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: box-shadow 0.2s, transform 0.2s;
}

.article-card:hover {
    box-shadow: 0 4px 12px rgba(91, 107, 217, 0.1);
    transform: translateY(-2px);
}

.article-card h3 {
    font-family: var(--font-serif-zh);
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.article-card .article-subtitle {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.article-card .article-desc {
    color: var(--color-text);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* 页脚 */
.footer {
    margin-top: 6rem;
    padding: 3rem 1.5rem 2rem;
    background: white;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    list-style: none;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-nav a {
    color: var(--color-text);
    font-size: 0.95rem;
    border: none;
}

.footer-nav a:hover {
    color: var(--color-primary);
    border: none;
}

.footer-info {
    color: var(--color-text-light);
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-info p {
    margin: 0.25rem 0;
}

.footer-cross-link {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

.footer-cross-link a {
    color: var(--color-accent);
    font-weight: 500;
}

.footer-beian {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px dashed var(--color-border);
    color: var(--color-text-light);
    font-size: 0.85rem;
    font-family: var(--font-sans-en), monospace;
    text-align: center;
}

.footer-beian p {
    display: inline;
}

.footer-beian p+p::before {
    content: " · ";
    margin: 0 0.5rem;
}

/* 使命宣言 */
.mission {
    text-align: center;
    padding: 3rem 2rem;
    margin: 4rem 0;
    background: linear-gradient(135deg, var(--color-primary-gradient-start) 0%, var(--color-primary-gradient-end) 100%);
    color: white;
    border-radius: 8px;
    font-family: var(--font-serif-zh);
    font-size: 1.25rem;
    line-height: 2;
    box-shadow: 0 4px 20px rgba(91, 107, 217, 0.2);
}

/* 文章样式（用于长文阅读） */
.article {
    max-width: 720px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
    font-size: 1.05rem;
    line-height: 2;
}

.article h1 {
    font-family: var(--font-serif-zh);
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    text-align: center;
}

.article .article-meta {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: 3rem;
}

.article h2 {
    font-family: var(--font-serif-zh);
    font-size: 1.4rem;
    color: var(--color-primary);
    margin: 3rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.article h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin: 2rem 0 0.75rem;
}

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

.article table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

.article th,
.article td {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    text-align: left;
}

.article th {
    background: #f5f3ec;
    font-weight: 600;
}

.article blockquote {
    border-left: 4px solid var(--color-accent);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--color-text);
    font-family: var(--font-serif-zh);
}

.article pre {
    background: #2a2a2a;
    color: #f0f0f0;
    padding: 1.5rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 移动端适配 */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .hero h2 {
        font-size: 1.15rem;
    }

    .hero {
        padding: 3rem 1rem 2rem;
    }

    .navbar-inner {
        flex-direction: column;
        gap: 0.5rem;
    }

    .navbar-nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

    .article h1 {
        font-size: 1.5rem;
    }
}


/* ========== 页脚资源链接 ========== */
.footer-resources {
    -size: 0.9rem;
}


/* 首页 Hero 显示 logo */
.hero-logo {
    width: 120px;
    height: auto;
    margin: 0 auto 1.5rem;
    display: block;
}

/* 文章页头部显示 logo */
.article-header-logo {
    width: 80px;
    height: auto;
    margin: 0 auto 1rem;
    display: block;
}



/* ========== 页脚资源链接 ========== */
.footer-resources {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-resources-title {
    color: var(--color-primary);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 0.75rem;
}

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

.footer-resources-links a {
    color: var(--color-accent);
    text-decoration: none;
    border: none;
    margin: 0 0.25rem;
}

.footer-resources-links a:hover {
    color: var(--color-primary);
    border-bottom: 1px solid var(--color-primary);
}