/* ===== 学术博客主题 - 简洁专业风 ===== */
:root {
    --bg: #ffffff;
    --bg-alt: #f7f8fa;
    --text: #2c3338;
    --text-light: #5f6368;
    --primary: #2b6cb0;
    --primary-dark: #1e4e8c;
    --border: #e2e6ea;
    --accent: #c05621;
    --code-bg: #f4f5f7;
    --radius: 6px;
    --max-width: 960px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1a1d24;
        --bg-alt: #22262e;
        --text: #d7dce3;
        --text-light: #9aa4b2;
        --primary: #6cb0ff;
        --primary-dark: #4a90e2;
        --border: #343942;
        --code-bg: #2a2e36;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); text-decoration: underline; }

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

/* ===== 顶部导航 ===== */
.site-header {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: color-mix(in srgb, var(--bg) 90%, transparent);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 20px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}
.logo:hover { text-decoration: none; color: var(--primary); }

.main-nav {
    display: flex;
    gap: 28px;
    margin-left: auto;
}

.main-nav a {
    color: var(--text-light);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}
.main-nav a:hover, .main-nav a.active {
    color: var(--primary);
    text-decoration: none;
}
.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
}
.lang-switch a { color: var(--text-light); padding: 4px 8px; border-radius: 4px; }
.lang-switch a.active { color: var(--primary); background: var(--bg-alt); }
.lang-switch a:hover { text-decoration: none; }
.lang-switch span { color: var(--border); }

/* ===== 主体内容 ===== */
main { padding: 48px 24px; min-height: calc(100vh - 64px - 80px); }

/* ===== 首页 Hero 区 ===== */
.hero {
    display: flex;
    gap: 40px;
    align-items: flex-start;
    margin-bottom: 56px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.hero-avatar {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border);
    flex-shrink: 0;
    background: var(--bg-alt);
}

.hero-avatar-placeholder {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 56px;
    color: white;
    flex-shrink: 0;
}

.hero-info { flex: 1; }
.hero-info h1 { font-size: 32px; margin-bottom: 8px; letter-spacing: -0.02em; }
.hero-info .title { font-size: 18px; color: var(--primary); font-weight: 500; margin-bottom: 16px; }
.hero-info .bio { color: var(--text-light); font-size: 16px; line-height: 1.8; margin-bottom: 16px; }

.hero-meta { display: flex; flex-wrap: wrap; gap: 16px; font-size: 14px; color: var(--text-light); }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }

/* ===== 内容版块 ===== */
.section { margin-bottom: 48px; }
.section h2 {
    font-size: 22px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}
.section h2 .emoji { font-weight: normal; }

/* ===== 时间线(教育经历)===== */
.timeline { position: relative; padding-left: 24px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--border);
}
.timeline-item { position: relative; margin-bottom: 28px; }
.timeline-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 8px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--bg);
    box-shadow: 0 0 0 2px var(--primary);
}
.timeline-item .period { font-size: 13px; color: var(--primary); font-weight: 600; margin-bottom: 4px; }
.timeline-item h3 { font-size: 17px; margin-bottom: 4px; }
.timeline-item .degree { font-size: 14px; color: var(--text-light); margin-bottom: 6px; }
.timeline-item .detail { font-size: 14px; color: var(--text-light); }

/* ===== 论文/项目列表 ===== */
.pub-list { display: flex; flex-direction: column; gap: 16px; }
.pub-item {
    padding: 18px 20px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary);
    transition: transform .2s, box-shadow .2s;
}
.pub-item:hover { transform: translateX(4px); box-shadow: 0 2px 8px rgba(0,0,0,.06); }
.pub-item .pub-type {
    display: inline-block;
    font-size: 11px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    margin-bottom: 8px;
}
.pub-item .pub-type.paper { background: #e3f2fd; color: #1565c0; }
.pub-item .pub-type.project { background: #fff3e0; color: #c05621; }
.pub-item h3 { font-size: 16px; margin-bottom: 6px; line-height: 1.5; }
.pub-item .authors { font-size: 14px; color: var(--text-light); margin-bottom: 4px; }
.pub-item .venue { font-size: 13px; color: var(--primary); font-style: italic; }
.pub-item .year { font-size: 12px; color: var(--text-light); }

/* ===== 文章卡片 ===== */
.post-card {
    display: block;
    padding: 24px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    margin-bottom: 16px;
    border: 1px solid var(--border);
    transition: transform .2s, box-shadow .2s;
}
.post-card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.08); text-decoration: none; }
.post-card h3 { font-size: 19px; margin-bottom: 8px; color: var(--text); }
.post-card .excerpt { color: var(--text-light); font-size: 15px; line-height: 1.7; margin-bottom: 12px; }
.post-card .post-meta { font-size: 13px; color: var(--text-light); display: flex; gap: 16px; }
.post-card .category {
    display: inline-block;
    background: var(--primary);
    color: white;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
}

/* ===== 文章详情 ===== */
.post-detail h1 { font-size: 30px; margin-bottom: 12px; line-height: 1.3; }
.post-detail .meta { color: var(--text-light); font-size: 14px; margin-bottom: 32px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.post-content { font-size: 16px; line-height: 1.9; }
.post-content h1 { font-size: 26px; margin: 32px 0 16px; }
.post-content h2 { font-size: 22px; margin: 28px 0 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.post-content h3 { font-size: 19px; margin: 24px 0 12px; }
.post-content p { margin-bottom: 18px; }
.post-content ul, .post-content ol { margin: 0 0 18px 24px; }
.post-content li { margin-bottom: 6px; }
.post-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 12px 20px;
    margin: 20px 0;
    background: var(--bg-alt);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-light);
}
.post-content code {
    background: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 14px;
    font-family: "SF Mono", "Fira Code", Consolas, monospace;
}
.post-content img { max-width: 100%; border-radius: var(--radius); margin: 16px 0; }

.back-link { display: inline-block; margin-bottom: 24px; font-size: 14px; }

/* ===== 联系方式 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}
.contact-item {
    padding: 16px 20px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 12px;
}
.contact-item .icon { font-size: 24px; }
.contact-item .label { font-size: 12px; color: var(--text-light); }
.contact-item .value { font-size: 15px; word-break: break-all; }

/* ===== 友情链接 ===== */
.link-list { display: flex; flex-wrap: wrap; gap: 12px; }
.link-item {
    padding: 10px 18px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 14px;
    transition: all .2s;
}
.link-item:hover { border-color: var(--primary); transform: translateY(-1px); text-decoration: none; }

/* ===== 页脚 ===== */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    color: var(--text-light);
    font-size: 14px;
    text-align: center;
}
.site-footer a { color: var(--primary); }

/* ===== 公共站按钮(原仅有 admin 有 .btn) ===== */
.btn {
    display: inline-block;
    padding: 8px 18px;
    border: 1px solid var(--primary);
    border-radius: var(--radius);
    background: var(--primary);
    color: #fff;
    font-size: 14px;
    cursor: pointer;
    transition: all .2s;
    line-height: 1.5;
}
.btn:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; text-decoration: none; }
.btn-secondary { background: transparent; color: var(--primary); }
.btn-secondary:hover { background: var(--bg-alt); color: var(--primary-dark); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ===== 技能网格 ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}
.skill-category h3 {
    font-size: 15px;
    color: var(--primary);
    margin-bottom: 12px;
    padding-bottom: 6px;
    border-bottom: 1px dashed var(--border);
}
.skill-items { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 16px;
    font-size: 13px;
}
.skill-item .icon { font-size: 15px; }

/* ===== 荣誉列表 ===== */
.honor-list { display: flex; flex-direction: column; gap: 10px; }
.honor-item {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 10px 14px;
    background: var(--bg-alt);
    border-radius: var(--radius);
    border-left: 3px solid var(--accent);
}
.honor-item .year {
    flex-shrink: 0;
    font-weight: 600;
    color: var(--primary);
    font-size: 14px;
    min-width: 56px;
}
.honor-item .title { font-size: 15px; }
.honor-item .issuer { font-size: 13px; color: var(--text-light); }
.honor-item .issuer::before { content: "· "; }

/* ===== 项目卡片 ===== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.project-card {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    transition: all .2s;
    border-left: 3px solid var(--accent);
}
.project-card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.07); }
.project-card .proj-year { font-size: 13px; color: var(--primary); font-weight: 600; }
.project-card h3 { font-size: 16px; margin: 6px 0 8px; line-height: 1.5; }
.project-card .proj-role {
    display: inline-block;
    font-size: 12px;
    padding: 2px 8px;
    background: var(--primary);
    color: #fff;
    border-radius: 10px;
    margin-bottom: 8px;
}
.project-card .proj-detail { font-size: 13px; color: var(--text-light); }

/* ===== 论文筛选标签 ===== */
.filter-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}
.filter-tab {
    padding: 6px 16px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--bg);
    color: var(--text-light);
    font-size: 13px;
    cursor: pointer;
    transition: all .2s;
    user-select: none;
}
.filter-tab:hover { border-color: var(--primary); color: var(--primary); }
.filter-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* 论文类型徽章细分(在原 .pub-type.paper / .project 基础上) */
.pub-type.patent { background: #f3e5f5; color: #6a1b9a; }
.pub-type.preprint { background: #e0f2f1; color: #00695c; }
.pub-item.is-hidden { display: none; }

/* ===== 简历打印页 ===== */
.cv-toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.cv-page {
    background: #fff;
    color: #1a1a1a;
    padding: 48px 56px;
    border: 1px solid var(--border);
    border-radius: 8px;
    max-width: 800px;
    box-shadow: 0 1px 4px rgba(0,0,0,.06);
    font-size: 14px;
    line-height: 1.7;
}
.cv-page h1 { font-size: 26px; margin-bottom: 2px; }
.cv-page .cv-subtitle { color: #444; font-size: 15px; margin-bottom: 4px; }
.cv-page .cv-contact { font-size: 12.5px; color: #666; margin-bottom: 20px; }
.cv-page .cv-contact span { margin-right: 14px; }
.cv-page h2 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: #2b6cb0;
    border-bottom: 2px solid #2b6cb0;
    padding-bottom: 4px;
    margin: 22px 0 10px;
}
.cv-page .cv-item { margin-bottom: 10px; }
.cv-page .cv-item-head { display: flex; justify-content: space-between; font-weight: 600; }
.cv-page .cv-item-head .date { color: #666; font-weight: 400; font-size: 13px; }
.cv-page ul { margin: 4px 0 8px 18px; }
.cv-page .cv-tag {
    display: inline-block;
    font-size: 12px;
    padding: 1px 8px;
    background: #eef4fb;
    border-radius: 8px;
    margin: 2px 4px 2px 0;
    color: #2b6cb0;
}

/* 打印:隐藏站点 chrome,只输出简历 */
@media print {
    .site-header, .site-footer, .cv-toolbar, .lang-switch { display: none !important; }
    main.container { padding: 0 !important; max-width: 100% !important; }
    .cv-page { box-shadow: none; border: none; padding: 0; max-width: 100%; }
    body { background: #fff; }
    a { color: #1a1a1a; text-decoration: none; }
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .hero { flex-direction: column; align-items: center; text-align: center; }
    .hero-meta { justify-content: center; }
    .hero-info h1 { font-size: 26px; }
    .main-nav { gap: 14px; flex-wrap: wrap; justify-content: center; }
    .main-nav a { font-size: 13px; }
    .logo { font-size: 17px; }
    main { padding: 32px 16px; }
    .section h2 { font-size: 19px; }
    .cv-page { padding: 24px 20px; }
}