:root {
  --rs-blue: #199cff;
  --rs-blue-deep: #0b7fda;
  --rs-blue-tint: #e8f4ff;
  --rs-ink: #17181c;
  --rs-ink-2: #55575e;
  --rs-ink-3: #9a9ca3;
  --rs-line: #e6e7ea;
  --rs-page: #f7f7f8;
  --rs-paper: #fff;
  --rs-max: 1120px;
  --rs-radius: 16px;
  --rs-font: -apple-system, BlinkMacSystemFont, "PingFang SC", "SF Pro Display",
    "Helvetica Neue", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--rs-page);
  color: var(--rs-ink);
  font-family: var(--rs-font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
}

.research-shell {
  width: min(var(--rs-max), calc(100% - 56px));
  margin-inline: auto;
}

/* ============ Nav ============ */
.research-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  isolation: isolate;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  background: rgba(247, 247, 248, 0.86);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.research-nav-inner {
  height: 62px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.research-brand {
  display: inline-flex;
  align-items: center;
  flex: none;
}

.research-brand img {
  height: 28px;
  width: auto;
}

.research-brand-divider {
  width: 1px;
  height: 20px;
  margin: 0 14px;
  background: var(--rs-line);
}

.research-brand-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--rs-ink);
}

.research-nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}

.research-nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--rs-ink-2);
  transition: color 0.15s;
}

.research-nav-links a:hover,
.research-nav-links a[aria-current="page"] {
  color: var(--rs-ink);
}

/* 这里原本有一条 .research-nav-accent：给导航里那条「米羊 Lab」上渐变字，
   标出「你在这个栏目里」。Lab 搬到独立 host 之后那条链接指的就是它自己所在的地方，
   已经从 partials/research_nav.html 里去掉，规则一并删除，不留没人用的样式。 */

.research-nav .nav-actions.sa {
  --sa-fg: var(--rs-ink);
  --sa-fg-2: var(--rs-ink-2);
  --sa-fg-3: var(--rs-ink-3);
  --sa-line: var(--rs-line);
  --sa-surface: #fff;
  --sa-hover: rgba(25, 156, 255, 0.08);
  --sa-accent: var(--rs-blue);
  --sa-accent-fg: #fff;
  --sa-shadow: 0 12px 34px rgba(20, 30, 45, 0.13);
}

/* ============ Hero ============ */
.research-hero {
  padding: clamp(56px, 7vw, 92px) 0 clamp(40px, 5vw, 64px);
}

.research-eyebrow {
  margin: 0 0 18px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--rs-ink-3);
  text-transform: uppercase;
}

.research-hero h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(36px, 5.4vw, 60px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
}

.research-hero h1 span {
  color: var(--rs-blue);
}

.research-hero-intro {
  max-width: 620px;
  margin: 22px 0 0;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--rs-ink-2);
}

/* ============ Sections ============ */
.research-section {
  padding: clamp(28px, 3.5vw, 44px) 0;
}

.research-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.research-section-head h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.research-section-lead {
  max-width: none;
  /* 抵掉 section-head 的下边距，引导语要贴着标题走 */
  margin: -14px 0 24px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--rs-ink-2);
}

.research-section-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--rs-ink-2);
  transition: color 0.15s;
}

.research-section-link:hover {
  color: var(--rs-blue-deep);
}

/* ============ Featured cards ============ */
.research-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.research-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--rs-line);
  border-radius: var(--rs-radius);
  background: var(--rs-paper);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}

/* 摘要只在横向大卡里出现，三列网格放不下 */
.research-card-summary {
  display: none;
}

.research-cards.is-single {
  grid-template-columns: minmax(0, 1fr);
}

.research-cards.is-single .research-card-summary {
  display: block;
}

.research-cards.is-single .research-card {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  align-items: stretch;
}

.research-cards.is-single .research-cover {
  aspect-ratio: auto;
  min-height: 260px;
}

.research-cards.is-single .research-card-body {
  justify-content: center;
  gap: 14px;
  padding: clamp(28px, 3.4vw, 44px);
}

.research-cards.is-single .research-card h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.35;
}

.research-cards.is-single .research-card-summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rs-ink-2);
}

.research-card:hover {
  transform: translateY(-2px);
  border-color: #d9dbdf;
  box-shadow: 0 14px 34px rgba(20, 20, 30, 0.08);
}

.research-cover {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: #dfeeff;
}

.research-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Abstract generated-art covers: layered soft gradients + blurred shapes. */
.research-cover-art,
.research-cover-art::before,
.research-cover-art::after {
  position: absolute;
  inset: 0;
  content: "";
}

.research-cover-art::before,
.research-cover-art::after {
  border-radius: 50%;
  filter: blur(26px);
  opacity: 0.9;
}

.research-cover-art[data-variant="1"] {
  background: linear-gradient(135deg, #eaf4ff 0%, #b9dbff 45%, #3d93f0 100%);
}
.research-cover-art[data-variant="1"]::before {
  inset: 32% -20% -40% 30%;
  background: #0e6fd6;
}
.research-cover-art[data-variant="1"]::after {
  inset: -30% 40% 40% -20%;
  background: #ffffff;
}

.research-cover-art[data-variant="2"] {
  background: linear-gradient(140deg, #f1efff 0%, #c6bfff 45%, #6d63e8 100%);
}
.research-cover-art[data-variant="2"]::before {
  inset: 30% -25% -35% 35%;
  background: #4a3fd6;
}
.research-cover-art[data-variant="2"]::after {
  inset: -35% 45% 45% -15%;
  background: #ffffff;
}

.research-cover-art[data-variant="3"] {
  background: linear-gradient(135deg, #fdf7ef 0%, #f1dcc4 50%, #cfe0f4 100%);
}
.research-cover-art[data-variant="3"]::before {
  inset: 35% -20% -35% 40%;
  background: #8fb8e6;
}
.research-cover-art[data-variant="3"]::after {
  inset: -30% 50% 45% -10%;
  background: #ffe6cc;
}

.research-card-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 10px;
  padding: 18px 20px 20px;
}

.research-tag {
  display: inline-flex;
  align-self: flex-start;
  align-items: center;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--rs-blue-tint);
  color: var(--rs-blue-deep);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.research-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.45;
}

.research-card-date {
  margin-top: auto;
  padding-top: 6px;
  font-size: 13px;
  color: var(--rs-ink-3);
  font-variant-numeric: tabular-nums;
}

/* ============ Research areas ============ */
.research-areas {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.research-area {
  padding: 24px 22px 26px;
  border: 1px solid var(--rs-line);
  border-radius: var(--rs-radius);
  background: var(--rs-paper);
}

.research-area-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

/* 序号是这条主线在页面上唯一看得见的地方，没有它八张卡片又变回一份清单 */
.research-area-index {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #c9ccd2;
}

.research-area-icon {
  display: inline-flex;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: var(--rs-blue-tint);
  color: var(--rs-blue);
}

.research-area-icon svg {
  width: 20px;
  height: 20px;
}

.research-area h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
}

.research-area p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--rs-ink-2);
}

/* ============ Research tools ============ */
/* 研究里长出来的工具。左边说清是什么，右边给处理前后两枚原像素裁切——
   这一段的说服力全在那两枚图上，所以右栏比左栏略宽。 */
.research-tool {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  gap: 28px;
  align-items: center;
  padding: 26px 28px;
  border: 1px solid var(--rs-line);
  border-radius: var(--rs-radius);
  background: var(--rs-paper);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.research-tool:hover {
  border-color: #d3d5da;
  box-shadow: 0 18px 40px rgba(23, 24, 28, 0.08);
  transform: translateY(-2px);
}

.research-tool-copy h3 {
  margin: 12px 0 10px;
  font-size: 22px;
  font-weight: 750;
  letter-spacing: -0.01em;
}

.research-tool-copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rs-ink-2);
}

.research-tool-go {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--rs-blue);
}

.research-tool-meta {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--rs-ink-3);
}

.research-tool-shots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.research-tool-shots figure {
  margin: 0;
}

.research-tool-shots img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rs-line);
  border-radius: 12px;
}

.research-tool-shots figcaption {
  margin-top: 6px;
  font-size: 11.5px;
  color: var(--rs-ink-3);
  text-align: center;
}

/* ============ Publication list ============ */
.research-filters {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.research-filters::-webkit-scrollbar {
  display: none;
}

.research-filter {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  flex: none;
  padding: 6px 14px;
  border: 1px solid var(--rs-line);
  border-radius: 999px;
  background: var(--rs-paper);
  color: var(--rs-ink-2);
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.research-filter-count {
  color: var(--rs-ink-3);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.research-filter:hover {
  border-color: #cfd2d7;
  color: var(--rs-ink);
}

.research-filter.is-active {
  border-color: var(--rs-blue);
  background: var(--rs-blue);
  color: #fff;
}

.research-filter.is-active .research-filter-count {
  color: rgba(255, 255, 255, 0.76);
}

.research-list {
  margin-top: 6px;
  border-top: 1px solid var(--rs-line);
}

.research-row {
  display: grid;
  grid-template-columns: 112px 96px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--rs-line);
}

.research-row.is-hidden {
  display: none;
}

.research-row-date {
  padding-top: 3px;
  font-size: 13px;
  color: var(--rs-ink-3);
  font-variant-numeric: tabular-nums;
}

.research-row-copy h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.45;
  transition: color 0.15s;
}

.research-row:hover .research-row-copy h3 {
  color: var(--rs-blue-deep);
}

.research-row-copy p {
  margin: 0;
  max-width: 720px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--rs-ink-2);
}

.research-empty {
  padding: 48px 0;
  color: var(--rs-ink-2);
}

/* ============ Footer ============ */
.research-footer {
  margin-top: clamp(40px, 6vw, 72px);
  background: #131417;
  color: #8b8d94;
}

.research-footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 0.6fr));
  gap: 32px;
  padding: 48px 0 36px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.research-footer-brand img {
  height: 26px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.95;
}

.research-footer-brand p {
  margin: 16px 0 0;
  max-width: 340px;
  font-size: 13px;
  line-height: 1.8;
}

.research-footer-col h4 {
  margin: 0 0 14px;
  font-size: 13px;
  font-weight: 600;
  color: #f2f2f4;
}

.research-footer-col a {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  transition: color 0.15s;
}

.research-footer-col a:hover {
  color: #fff;
}

.research-footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 20px 0 26px;
  font-size: 12px;
}

.research-footer-bottom a:hover {
  color: #fff;
}

/* ============ Article ============ */
.article-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: 0;
  height: 2px;
  background: var(--rs-blue);
}

.article-preview-banner {
  margin-top: 20px;
  padding: 9px 14px;
  border: 1px solid #f3ca75;
  border-radius: 8px;
  background: #fff8e8;
  color: #8b5b08;
  font-size: 13px;
  text-align: center;
}

/* 文章页顶部铺一层品牌色渐变，替掉原先那条与内容无关的生成封面色带 */
.article-page {
  background:
    linear-gradient(180deg, #e6f1ff 0%, rgba(230, 241, 255, 0) 440px),
    var(--rs-page);
  background-repeat: no-repeat;
}

.article-header {
  max-width: 780px;
  margin: 0 auto;
  padding: clamp(56px, 7vw, 96px) 0 clamp(32px, 4vw, 44px);
  text-align: center;
}

.article-type {
  margin: 0 0 18px;
  font-size: 13px;
  font-weight: 600;
  color: var(--rs-blue-deep);
}

.article-header h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 54px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.article-deck {
  margin: 24px auto 0;
  max-width: 680px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--rs-ink-2);
  text-align: left;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.article-byline {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--rs-ink-2);
}

.article-languages {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 22px;
}

.article-languages a {
  padding: 5px 10px;
  border: 1px solid var(--rs-line);
  border-radius: 6px;
  color: var(--rs-ink-3);
  font-size: 12px;
}

.article-languages a:hover,
.article-languages a.active {
  border-color: #a7d4fa;
  background: var(--rs-blue-tint);
  color: var(--rs-blue-deep);
}

.article-avatar {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--rs-blue), #6366f1);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

.article-byline b {
  color: var(--rs-ink);
  font-weight: 600;
}

.article-byline-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--rs-ink-3);
}

.article-actions {
  display: flex;
  gap: 8px;
}

.article-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border: 1px solid var(--rs-line);
  border-radius: 8px;
  background: var(--rs-paper);
  color: var(--rs-ink-2);
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.article-action:hover {
  border-color: #cfd2d7;
  color: var(--rs-ink);
}

.article-action svg {
  width: 14px;
  height: 14px;
}

.article-cover {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 5;
  margin-top: 8px;
  border-radius: var(--rs-radius);
  background: #dfeeff;
}

.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-cover .research-cover-art::before,
.article-cover .research-cover-art::after {
  filter: blur(48px);
}

.article-layout {
  display: grid;
  grid-template-columns: 216px minmax(0, 784px);
  gap: clamp(32px, 4.5vw, 64px);
  justify-content: center;
  padding: clamp(36px, 4.5vw, 56px) 0 0;
}

.article-toc {
  position: sticky;
  top: 82px;
  align-self: start;
  max-height: calc(100vh - 108px);
  overflow-y: auto;
  /* 目录自身的滚动条会在正文旁边多出一条竖线，喧宾夺主 */
  scrollbar-width: none;
}

.article-toc::-webkit-scrollbar {
  display: none;
}

.article-toc-label {
  margin: 0 0 10px 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--rs-ink-3);
}

.article-toc ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-toc ul ul {
  padding-left: 0;
}

/* 目录项一律单行，超出用省略号。中文标题一折行，整条目录就糊成一片文字墙，
   层级和当前位置都读不出来了。 */
.article-toc a {
  display: block;
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--rs-ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.15s, background 0.15s;
}

.article-toc ul ul a {
  padding-left: 22px;
  font-size: 12.5px;
  color: var(--rs-ink-3);
}

.article-toc a:hover {
  background: #eef0f2;
  color: var(--rs-ink);
}

.article-toc a.is-active,
.article-toc ul ul a.is-active {
  background: var(--rs-blue-tint);
  color: var(--rs-blue-deep);
  font-weight: 600;
}

.article-body {
  min-width: 0;
  padding: clamp(24px, 3.2vw, 52px);
  border: 1px solid var(--rs-line);
  border-radius: 20px;
  background: var(--rs-paper);
  font-size: 17px;
  line-height: 1.9;
  color: #2a2c31;
}

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

.article-body h2,
.article-body h3 {
  color: var(--rs-ink);
  letter-spacing: -0.01em;
  scroll-margin-top: 90px;
}

.article-body h2 {
  margin: 2.35em 0 0.8em;
  padding-bottom: 10px;
  border-bottom: 1px solid #ececef;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.4;
}

.article-body h3 {
  margin: 1.8em 0 0.6em;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote {
  margin: 0 0 1.2em;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4em;
}

.article-body li {
  margin-bottom: 0.4em;
}

.article-body li::marker {
  color: #a1a1aa;
}

.article-body strong {
  color: var(--rs-ink);
  font-weight: 700;
}

.article-body a {
  color: #7057b8;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(112, 87, 184, 0.35);
  text-underline-offset: 4px;
}

.article-body blockquote {
  position: relative;
  padding: 20px 24px 20px 28px;
  overflow: hidden;
  border: 1px solid #eee9ef;
  border-radius: 12px;
  background: linear-gradient(110deg, #fff8f3 0%, #fff 46%, #fdf7fc 100%);
  color: #332c34;
  font-size: 16px;
}

.article-body blockquote::before {
  position: absolute;
  top: 14px;
  bottom: 14px;
  left: 0;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, #f97316 0%, #d6409f 100%);
  content: "";
}

.article-body blockquote p:last-child {
  margin-bottom: 0;
}

.article-body img {
  max-width: 100%;
  height: auto;
  margin: 2em 0;
  border-radius: 12px;
}

.article-body pre,
.article-body pre.highlight {
  max-width: 100%;
  overflow-x: auto;
  margin: 1.8em 0;
  padding: 18px 20px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #f8fafc;
  color: #1e293b;
  font-size: 14px;
  line-height: 1.7;
}

.article-body code {
  padding: 0.12em 0.35em;
  border-radius: 4px;
  background: #f1f5f9;
  color: #1e293b;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.86em;
}

.article-body pre code,
.article-body pre.highlight code {
  padding: 0;
  background: transparent;
}

.article-body strong.highlight {
  padding: 0 0.06em;
  background: linear-gradient(
    transparent 58%,
    rgba(240, 80, 138, 0.2) 58%,
    rgba(240, 80, 138, 0.2) 92%,
    transparent 92%
  );
  color: #282126;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.article-body .mermaid {
  margin: 2em 0;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--rs-line);
  border-radius: 12px;
  background: #fff;
  text-align: center;
}

.article-body .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25em 0;
}

.article-body .task-list-item {
  list-style: none;
}

.article-body .task-list-control {
  margin-right: 0.5em;
}

.article-body .footnote {
  color: var(--rs-ink-2);
  font-size: 14px;
}

.article-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  margin: 1.8em 0;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.6;
}

.article-body th,
.article-body td {
  min-width: 120px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--rs-line);
  text-align: left;
}

.article-body th {
  color: var(--rs-ink);
  font-weight: 700;
}

.article-end {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--rs-line);
  font-size: 13px;
  color: var(--rs-ink-3);
}

.article-related {
  padding-top: clamp(36px, 5vw, 56px);
}

.article-related h2 {
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 700;
}

.article-related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.article-related-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 20px;
  border: 1px solid var(--rs-line);
  border-radius: 12px;
  background: var(--rs-paper);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.article-related-card:hover {
  border-color: #d9dbdf;
  box-shadow: 0 10px 26px rgba(20, 20, 30, 0.06);
}

.article-related-card h3 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
}

.article-related-card time {
  font-size: 13px;
  color: var(--rs-ink-3);
}

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .research-nav-links {
    display: none;
  }

  .research-cards {
    grid-template-columns: 1fr 1fr;
  }

  .research-areas {
    grid-template-columns: 1fr 1fr;
  }

  /* 两栏挤到 480 以下时，右边那两枚裁切图会被压到 220 宽，
     原像素裁切被容器缩放就等于白裁了。所以先改上下叠。 */
  .research-tool {
    grid-template-columns: minmax(0, 1fr);
  }

  .research-footer-main {
    grid-template-columns: 1fr 1fr;
  }

  .article-layout {
    grid-template-columns: minmax(0, 784px);
  }

  .article-toc {
    display: none;
  }
}

@media (max-width: 640px) {
  .research-shell {
    width: calc(100% - 32px);
  }

  .research-brand-divider,
  .research-brand-label {
    display: none;
  }

  .research-hero {
    padding-top: 40px;
  }

  .research-cards,
  .research-areas,
  .research-footer-main,
  .article-related-grid {
    grid-template-columns: 1fr;
  }

  .research-cards.is-single .research-card {
    grid-template-columns: 1fr;
  }

  .research-cards.is-single .research-cover {
    aspect-ratio: 16 / 10;
    min-height: 0;
  }

  .research-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px 0;
  }

  .research-row-date {
    order: 2;
    padding-top: 0;
  }

  .research-row-copy {
    order: 1;
  }

  .research-row .research-tag {
    order: 0;
  }

  .article-header {
    padding-top: 36px;
    text-align: left;
  }

  .article-deck {
    margin-left: 0;
  }

  .article-cover {
    aspect-ratio: 16 / 9;
  }

  .article-body {
    padding: 20px 18px;
    border-radius: 16px;
    font-size: 16px;
    line-height: 1.85;
  }

  .article-body h2 {
    font-size: 21px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}