/**
 * 个人展示站 — Cal.com 策展风
 * Cal Sans 展示标题 · Inter 正文 · 多层阴影深度 · 灰阶单色 · 宽松呼吸感
 */

:root {
  --charcoal: #242424;
  --midnight: #111111;
  --mid-gray: #898989;
  --paper: #ffffff;
  --snow: #f5f5f5;
  --link-blue: #0099ff;
  --ring: rgba(59, 130, 246, 0.5);

  /* Cal.com 多层阴影 */
  --shadow-card: rgba(19, 19, 22, 0.7) 0px 1px 5px -4px,
    rgba(34, 42, 53, 0.08) 0px 0px 0px 1px,
    rgba(34, 42, 53, 0.05) 0px 4px 8px 0px;
  --shadow-hover: rgba(19, 19, 22, 0.7) 0px 2px 8px -4px,
    rgba(34, 42, 53, 0.12) 0px 0px 0px 1px,
    rgba(34, 42, 53, 0.08) 0px 6px 16px 0px;
  --shadow-subtle: rgba(34, 42, 53, 0.05) 0px 4px 8px;

  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --r-pill: 9999px;

  --cal: "Cal Sans", "Inter", system-ui, sans-serif;
  --inter: "Inter", system-ui, -apple-system, sans-serif;
  --mono: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --container: min(1120px, calc(100% - 48px));
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--inter);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: var(--mid-gray);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--cal);
  font-weight: 600;
  color: var(--charcoal);
  margin: 0 0 0.5rem;
  line-height: 1.1;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1rem; }
strong { font-weight: 600; color: var(--charcoal); }

a {
  color: var(--link-blue);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover { opacity: 0.8; }

:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--snow);
  box-shadow: rgba(34, 42, 53, 0.08) 0px 0px 0px 1px;
  border-radius: var(--r-sm);
  padding: 2px 8px;
}

/* ================================================
   顶栏：轻型 + 固定
   ================================================ */

.site-top {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px;
}

.site-top__name {
  font-family: var(--cal);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--midnight);
  text-decoration: none;
}

.site-top__name:hover { opacity: 0.7; text-decoration: none; }

.site-top__links {
  display: flex;
  gap: 8px;
  align-items: center;
}

.site-top__links a {
  font-family: var(--inter);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--midnight);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--r-md);
}

.site-top__links a:hover {
  background: var(--snow);
  opacity: 1;
}

/* 中英镜像页互链（/ 与 /en/），与导航链接视觉协调 */
.lang-switch {
  font-family: var(--inter);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--link-blue);
  padding: 6px 14px;
  border-radius: var(--r-md);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.lang-switch:hover {
  background: var(--snow);
}

.btn-dark {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  background: var(--charcoal);
  color: var(--paper) !important;
  font-family: var(--inter);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--r-md);
  text-decoration: none !important;
  border: none;
  cursor: pointer;
  box-shadow: rgba(255, 255, 255, 0.15) 0px 2px 0px inset;
}

.btn-dark:hover { opacity: 0.7; }

/* ================================================
   首页
   ================================================ */

.hero {
  text-align: center;
  padding: 96px 24px 80px;
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  margin-bottom: 20px;
}

.hero__sub {
  font-family: var(--inter);
  font-size: 1.125rem;
  font-weight: 300;
  line-height: 1.55;
  color: var(--mid-gray);
  max-width: 44ch;
  margin: 0 auto;
}

/* 内容区域 */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* 顶栏为 sticky：首页 #work / #research / #writing（及子页回链）锚点滚动时预留上方空隙，避免区块标题被遮挡 */
.section[id] {
  scroll-margin-top: 88px;
}

/* 项目区内年份锚点（#work-2026 等）与顶栏对齐 */
h3.section__year-label[id] {
  scroll-margin-top: 88px;
}

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 32px;
}

.section__lede {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--mid-gray);
  margin: -20px 0 24px;
  max-width: 52ch;
}

.section__head h2 {
  margin: 0;
}

.section__kicker {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--mid-gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* 项目区：按年份分块，年份下卡片组内为自新到旧 */
.section__year-group + .section__year-group {
  margin-top: 48px;
}

.section__year-label {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--mid-gray);
  text-transform: uppercase;
  margin: 0 0 18px;
  padding-top: 4px;
}

h3.section__year-label {
  font-size: 0.8125rem;
  font-weight: 600;
}

.divider {
  height: 1px;
  background: rgba(34, 42, 53, 0.08);
  margin-bottom: 96px;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}

/* 卡片网格 */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.card {
  background: var(--paper);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  padding: 28px 24px 24px;
  display: flex;
  flex-direction: column;
  min-width: 0; /* 网格子项内长文可折行，避免撑破整卡 */
  transition: box-shadow 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.card:hover {
  box-shadow: var(--shadow-hover);
  color: inherit;
  text-decoration: none;
}

.card__kicker {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--mid-gray);
  margin-bottom: 14px;
}

.card h3 {
  margin-bottom: 10px;
}

/* article.card 内标题链到总览：避免与段落内链嵌套；样式同原 h3 */
.card h3 a.card__heading-link {
  color: inherit;
  text-decoration: none;
}

.card h3 a.card__heading-link:hover {
  text-decoration: underline;
  opacity: 1;
}

.card p {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--mid-gray);
  min-width: 0;
  overflow-wrap: break-word;
}

/* 首页卡片描述统一不加粗（避免与全局 strong 样式冲突） */
.card p strong {
  font-weight: inherit;
  color: inherit;
}

.card__cta {
  margin-top: auto;
  padding-top: 20px;
  font-family: var(--inter);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--charcoal);
  text-decoration: none;
}

.card__cta:hover { text-decoration: underline; color: var(--charcoal); }

.card--placeholder {
  opacity: 0.5;
}

.card--placeholder:hover {
  box-shadow: var(--shadow-card);
}

/* 页脚：全站统一顶线 + 版权与导航左右（窄屏纵向堆叠） */
.site-footer {
  margin-top: 0;
  border-top: 1px solid rgba(34, 42, 53, 0.08);
  background: var(--snow);
  padding: 40px 24px 56px;
}

.site-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px 28px;
}

.site-footer__copy {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--mid-gray);
  margin: 0;
  line-height: 1.5;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
}

.site-footer__links a {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--mid-gray);
  text-decoration: none;
}

.site-footer__links a:hover {
  color: var(--charcoal);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 560px) {
  .site-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ================================================
   文档详情页：左侧目录 + 右侧正文
   ================================================ */

.page-doc {
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px 24px 96px;
}

.doc-back {
  margin-bottom: 28px;
}

.doc-back a {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--mid-gray);
  text-decoration: none;
}

.doc-back a:hover { color: var(--charcoal); text-decoration: underline; }

.doc-layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

/* 左侧 TOC */
.doc-toc {
  position: sticky;
  top: 76px;
  padding: 20px 16px;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  background: var(--paper);
}

.doc-toc__label {
  font-family: var(--mono);
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--mid-gray);
  margin: 0 0 14px;
}

.doc-toc nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.doc-toc a {
  font-size: 0.8125rem;
  line-height: 1.35;
  font-weight: 400;
  color: var(--mid-gray);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: var(--r-md);
}

.doc-toc a:hover {
  color: var(--charcoal);
  background: var(--snow);
}

.doc-toc a.is-active {
  color: var(--charcoal);
  font-weight: 500;
  background: var(--snow);
}

/* 右侧内容 */
.doc-content { min-width: 0; }

.doc-header {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(34, 42, 53, 0.08);
  scroll-margin-top: 88px;
}

.article-title {
  font-family: var(--cal);
  font-weight: 600;
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  line-height: 1.2;
  color: var(--charcoal);
  margin-bottom: 12px;
}

.article-meta {
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--mid-gray);
  margin-bottom: 8px;
  line-height: 1.5;
}

.doc-section {
  margin-bottom: 48px;
  scroll-margin-top: 88px;
}

.doc-section h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(34, 42, 53, 0.08);
}

/* 标题自带 id 时用于锚点滚动（长文内 h3 小节） */
.doc-section h2[id],
.article-body h3[id] {
  scroll-margin-top: 88px;
}

.article-body {
  font-size: 0.9375rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--mid-gray);
}

.article-body strong {
  color: var(--charcoal);
}

.article-body ul, .article-body ol {
  padding-left: 1.15rem;
  margin: 0 0 1rem;
}

.article-body li { margin-bottom: 0.5rem; }

.article-body blockquote {
  margin: 1.5rem 0;
  padding: 18px 20px;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  background: var(--paper);
  color: var(--mid-gray);
}

/* 引用块内列表：与设计文档中的示例问句区一致 */
.article-body blockquote ul {
  margin-bottom: 0;
}

/* 长文小节标题与表格（项目文档页） */
.article-body h3 {
  font-family: var(--cal);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--charcoal);
  margin: 1.75rem 0 0.75rem;
  line-height: 1.25;
}

.article-body h3:first-child {
  margin-top: 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  margin: 0 0 1.25rem;
  box-shadow: var(--shadow-card);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.article-body th,
.article-body td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(34, 42, 53, 0.08);
}

.article-body th {
  font-family: var(--inter);
  font-weight: 600;
  color: var(--charcoal);
  background: var(--snow);
}

.article-body tr:last-child td {
  border-bottom: none;
}

.article-body pre.doc-pre {
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.45;
  margin: 0 0 1.25rem;
  padding: 16px 18px;
  overflow-x: auto;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  background: var(--paper);
  color: var(--charcoal);
}

/* 数字条 */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin: 24px 0 32px;
}

.stat-strip__item {
  padding: 18px 16px;
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-card);
  background: var(--paper);
}

.stat-strip__value {
  font-family: var(--cal);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--charcoal);
  line-height: 1.2;
}

.stat-strip__label {
  font-size: 0.6875rem;
  color: var(--mid-gray);
  margin-top: 8px;
  line-height: 1.35;
}

/* 信息列表 */
.info-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.info-list li {
  padding: 14px 0;
  border-bottom: 1px solid rgba(34, 42, 53, 0.06);
  display: grid;
  gap: 4px;
}

.info-list strong {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--mid-gray);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.muted {
  font-size: 0.8125rem;
  color: var(--mid-gray);
}

/* 设计文档长文：双栏要点、编号步骤、表格与正文间距 */
.doc-columns {
  display: grid;
  gap: 1.25rem;
  margin: 0 0 1.25rem;
}

@media (min-width: 640px) {
  .doc-columns--2 {
    grid-template-columns: 1fr 1fr;
  }
}

.doc-columns > .article-body {
  margin: 0;
}

/* 协作流程：圆角序号 + 左对齐正文（与 Cal 系标题协调） */
.article-body ol.doc-steps {
  list-style: none;
  padding-left: 0;
  margin-left: 0;
}

.doc-steps {
  margin: 0 0 1rem;
  counter-reset: docstep;
}

.doc-steps > li {
  position: relative;
  padding-left: 2.65rem;
  margin-bottom: 1.2rem;
  counter-increment: docstep;
  line-height: 1.6;
  font-size: 0.9375rem;
  color: var(--mid-gray);
}

.doc-steps > li::before {
  content: counter(docstep);
  position: absolute;
  left: 0;
  top: 0.12rem;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 50%;
  background: var(--snow);
  box-shadow: var(--shadow-card);
  font-family: var(--cal);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--charcoal);
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.doc-steps > li strong {
  color: var(--charcoal);
}

/* 表格与上一段标题留白 */
.article-body > table {
  margin-top: 0.5rem;
}

/* 文档版本切换：v1 / v2 互跳入口 */
.doc-version-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}

.doc-version-switch__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  box-shadow: var(--shadow-card);
  background: var(--paper);
  color: var(--charcoal);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
}

.doc-version-switch__btn:hover {
  background: var(--snow);
}

.doc-version-switch__btn.is-active {
  background: var(--charcoal);
  color: var(--paper);
}

/* 响应 */
@media (max-width: 860px) {
  .doc-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .doc-toc {
    position: static;
  }

  .doc-toc nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .hero { padding: 64px 24px 56px; }
  .section { padding-bottom: 64px; }
  .divider { margin-bottom: 64px; }

  .site-top__links a:not(.btn-dark) {
    display: none;
  }

  .stat-strip {
    grid-template-columns: 1fr 1fr;
  }
}