/* 视觉对齐 https://rd.me/ — 浅色 + 系统深色偏好 */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #252525;
  --text-80: rgba(37, 37, 37, 0.8);
  --text-70: rgba(37, 37, 37, 0.7);
  --text-60: rgba(37, 37, 37, 0.6);
  --muted: rgba(37, 37, 37, 0.62);
  --faint: rgba(37, 37, 37, 0.55);
  --border: rgba(0, 0, 0, 0.1);
  --border-strong: rgba(0, 0, 0, 0.14);
  --hairline: rgba(0, 0, 0, 0.08);
  --radius: 0.5rem;
  --radius-lg: 0.5rem;
  --font: "Inter", system-ui, -apple-system, "BlinkMacSystemFont", "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --content-max: 72rem;
  --search-muted: #f4f4f5;
  --search-muted-hover: #ebebeb;
  --link-blue: #2563eb;
  --link-blue-hover: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141414;
    --text: #fafafa;
    --text-80: rgba(250, 250, 250, 0.82);
    --text-70: rgba(250, 250, 250, 0.72);
    --text-60: rgba(250, 250, 250, 0.6);
    --muted: rgba(250, 250, 250, 0.65);
    --faint: rgba(250, 250, 250, 0.55);
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.14);
    --hairline: rgba(255, 255, 255, 0.08);
    --search-muted: #27272a;
    --search-muted-hover: #3f3f46;
    --link-blue: #60a5fa;
    --link-blue-hover: #93c5fd;
  }
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.site-root {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration-color: currentColor;
  text-underline-offset: 3px;
}

a:hover {
  opacity: 0.92;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

/* —— 顶栏：rd.me nav + hairline —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}

.site-header__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1rem 1rem;
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: 0.45rem 0.65rem;
  justify-content: space-between;
}

@media (min-width: 901px) {
  .brand {
    flex-shrink: 0;
  }

  .header-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.35rem;
    min-width: 0;
    flex: 0 1 auto;
  }

  .search-trigger-wrap {
    flex: 0 0 auto;
    margin-left: 0;
    justify-content: flex-end;
    order: 0;
    margin-right: 0;
  }

  .nav-cluster {
    flex: 0 0 auto;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-left: 0;
  }

  .nav-main {
    flex-wrap: nowrap;
    gap: 0.12rem 0.26rem;
    justify-content: flex-end;
  }

  .nav-toggle {
    display: none !important;
  }
}

.brand {
  font-weight: 600;
  font-size: 1.125rem;
  line-height: 1;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand a {
  text-decoration: none;
  color: var(--text);
  transition: color 0.15s ease;
}

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

.search-trigger-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-width: 0;
}

.nav-cluster {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex: 0 1 auto;
  min-width: 0;
}

.search-trigger {
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.search-trigger--desktop {
  display: none;
  width: 14rem;
  max-width: 100%;
  height: 2rem;
  padding: 0 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--search-muted);
  color: var(--text-60);
  font-size: 0.875rem;
  line-height: 1;
}

@media (min-width: 1024px) {
  .search-trigger--desktop {
    display: flex;
  }
}

.search-trigger--desktop:hover {
  background: var(--search-muted-hover);
  color: var(--text);
}

.search-trigger__icon {
  flex-shrink: 0;
  color: var(--text-60);
}

.search-trigger__kbd {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.125rem;
  font-size: 10px;
  line-height: 1;
  padding: 0.125rem 0.35rem;
  border-radius: 0.25rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--muted);
  font-family: inherit;
}

.search-trigger__cmd {
  flex-shrink: 0;
}

.search-trigger--mobile {
  display: inline-flex;
  width: auto;
  height: auto;
  padding: 0.25rem;
  border: none;
  background: none;
  color: var(--muted);
  border-radius: var(--radius);
}

@media (min-width: 1024px) {
  .search-trigger--mobile {
    display: none !important;
  }
}

.search-trigger--mobile:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--search-muted) 80%, transparent);
}

.ui-navlink {
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.ui-navlink:hover {
  color: var(--text);
  opacity: 1;
}

@media (min-width: 901px) {
  .nav-main > a.ui-navlink,
  .nav-main > .nav-dd > .nav-dd__label.ui-navlink {
    padding: 0.375rem 0.625rem;
    border-radius: var(--radius);
    border: 1px solid transparent;
    background: transparent;
  }

  .nav-main > a.ui-navlink:hover,
  .nav-main > .nav-dd:hover > .nav-dd__label.ui-navlink,
  .nav-main > .nav-dd > .nav-dd__label.ui-navlink:hover {
    background: var(--search-muted);
    border-color: var(--border);
    color: var(--text);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  }

  .nav-main > a.ui-navlink.is-active {
    background: var(--search-muted);
    border-color: var(--border);
    color: var(--text);
  }

  .nav-dd.is-open > .nav-dd__label.ui-navlink {
    background: var(--search-muted);
    border-color: var(--border);
    color: var(--text);
  }
}

.nav-main a.is-active,
.nav-main .nav-dd.is-open .nav-dd__label {
  color: var(--text);
}

.nav-main {
  display: flex;
  align-items: center;
  gap: 0.35rem 0.85rem;
  flex-wrap: wrap;
}

.nav-main a,
.nav-main .nav-dd__label {
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

.nav-main a:not(.ui-navlink):hover,
.nav-main .nav-dd__label:hover {
  color: var(--text);
}

.nav-dd {
  position: relative;
}

.nav-dd__label {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  border: none;
  background: none;
  font: inherit;
  padding: 0;
  color: var(--muted);
}

.nav-dd__chevron {
  flex-shrink: 0;
  opacity: 0.75;
  transition: transform 0.2s ease;
}

.nav-dd.is-open .nav-dd__chevron {
  transform: rotate(180deg);
}

.nav-dd__menu {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.35rem;
  min-width: 160px;
  padding: 0.35rem 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  z-index: 50;
}

@media (prefers-color-scheme: dark) {
  .nav-dd__menu {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

.nav-dd.is-open .nav-dd__menu {
  display: block;
}

.nav-dd__menu a {
  display: block;
  padding: 0.4rem 0.85rem;
  color: var(--muted);
}

.nav-dd__menu a:hover {
  background: var(--search-muted);
  color: var(--text);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  border-radius: var(--radius);
  transition: color 0.15s ease, background 0.15s ease;
}

.icon-btn:hover {
  background: var(--search-muted);
  color: var(--text);
}

.nav-toggle {
  display: none;
  border: none;
  background: none;
  padding: 0.25rem;
  cursor: pointer;
  color: var(--muted);
  border-radius: var(--radius);
}

.nav-toggle:hover {
  color: var(--text);
  background: color-mix(in srgb, var(--search-muted) 70%, transparent);
}

@media (max-width: 900px) {
  .site-header__inner {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    grid-template-rows: auto auto;
    align-items: center;
    column-gap: 0.5rem;
    row-gap: 0.65rem;
  }

  .header-right {
    display: contents;
  }

  .brand {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .brand a {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .search-trigger-wrap {
    grid-column: 2;
    grid-row: 1;
    justify-self: end;
    width: auto;
    flex: unset;
  }

  .site-header__inner > .nav-toggle {
    grid-column: 3;
    grid-row: 1;
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    margin-left: 0;
  }

  .nav-cluster {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .nav-main {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    padding-top: 0.75rem;
    border-top: 1px solid var(--hairline);
    gap: 0.25rem;
  }

  .site-header.is-menu-open .nav-main {
    display: flex;
  }

  .nav-main > a.ui-navlink,
  .nav-main > .nav-dd > .nav-dd__label.ui-navlink {
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius);
  }
}

/* —— 主内容 —— */
main {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 1.5rem 0.5rem 3rem;
  flex: 1;
}

@media (min-width: 640px) {
  main {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

@media (min-width: 1024px) {
  main {
    padding-top: 2rem;
    padding-bottom: 4rem;
  }
}

/* —— 首页 hero：rd.me 左图右文 flex —— */
.hero {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1.25rem 3rem;
}

@media (min-width: 1024px) {
  .hero {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
}

.hero__photo {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--search-muted);
  width: 100%;
  max-width: 28rem;
  margin-left: auto;
  margin-right: auto;
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .hero__photo {
    width: 20rem;
    max-width: 20rem;
    margin-left: 0;
    margin-right: 0;
  }
}

.hero__photo-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 200px;
  color: var(--faint);
  font-size: 0.875rem;
}

.hero__photo img {
  width: 100%;
  height: auto;
  display: block;
}

.hero__text {
  flex: 1;
  min-width: 0;
}

.hero__title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 0.5rem;
  line-height: 1.2;
  color: var(--text);
}

.hero__subtitle-wrap {
  font-size: 1.25rem;
  line-height: 1.45;
  color: var(--text-80);
  margin-bottom: 0.5rem;
}

.hero__subtitle {
  margin: 0;
  font-weight: 400;
}

.hero__rule {
  border: none;
  border-top: 1px solid var(--border-strong);
  margin: 0.75rem 0 0.75rem;
  opacity: 0.85;
}

.hero__body {
  max-width: none;
  font-size: 1rem;
  line-height: 1.625;
  color: var(--text-70);
}

.hero__body > * + * {
  margin-top: 0.75rem;
}

.hero__body p,
.hero__body li {
  margin: 0 0 0.75rem;
  color: inherit;
  font-size: inherit;
  line-height: inherit;
}

.hero__body p:last-child,
.hero__body li:last-child {
  margin-bottom: 0;
}

.hero__body a,
.hero__body .link-inline {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.hero__body a:hover {
  opacity: 0.85;
}

.hero__body-lead {
  margin: 0;
  color: var(--faint);
  font-size: 0.95rem;
}

.hero__load-error {
  margin-bottom: 1rem;
}

.page-simple__title {
  margin-bottom: 1rem;
}

.page-simple__subtitle {
  margin-top: -0.35rem;
  margin-bottom: 1rem;
}

.page-simple {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
}

/* Blog 分区页 — 对齐 https://rd.me/blog 卡片栅格 */
.blog-hub {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
}

.blog-hub__title {
  font-size: 1.875rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 1.25rem;
  line-height: 1.2;
  color: var(--text);
}

.blog-hub__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 768px) {
  .blog-hub__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
  }
}

.blog-hub__card {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: color-mix(in srgb, var(--search-muted) 55%, var(--bg));
  overflow: hidden;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.15s ease;
}

.blog-hub__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
  border-color: var(--border-strong);
}

@media (prefers-color-scheme: dark) {
  .blog-hub__card:hover {
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
  }
}

.blog-hub__card--soon {
  opacity: 0.62;
}

.blog-hub__card--soon:hover {
  transform: none;
  box-shadow: none;
}

.blog-hub__card-banner {
  position: relative;
  height: 4rem;
  overflow: hidden;
  background: var(--search-muted);
}

.blog-hub__card-banner img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.blog-hub__card-body {
  display: flex;
  flex-direction: column;
  padding: 1.15rem 1.25rem 1.25rem;
  min-height: 0;
}

.blog-hub__card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.5rem;
  margin-bottom: 0.25rem;
}

.blog-hub__card-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
}

.blog-hub__card-title a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

.blog-hub__card-title a:hover {
  color: var(--link-blue);
}

.blog-hub__card-count {
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
}

.blog-hub__card-desc {
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  line-height: 1.55;
  font-style: italic;
  color: var(--muted);
}

.blog-hub__links {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
}

.blog-hub__links li + li {
  margin-top: 0.35rem;
}

.blog-hub__link {
  font-size: 0.875rem;
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--muted) 50%, transparent);
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

.blog-hub__link:hover {
  color: var(--link-blue);
  text-decoration-color: var(--link-blue);
}

.blog-hub__link-text {
  display: -webkit-box;
  line-clamp: 2;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-hub__footer {
  margin-top: 1.25rem;
  text-align: center;
}

.blog-hub__all {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.blog-hub__all:hover {
  color: var(--text);
}

.blog-hub__all-chevron {
  flex-shrink: 0;
}

.article-back {
  margin-top: 2.5rem;
  font-size: 0.95rem;
}

/* 分类详情页（对齐 rd.me/blog?track=xxx） */
.track-page {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
}

.track-page__title {
  margin: 0;
  font-size: clamp(1.9rem, 3.5vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.track-page__count {
  margin: 0.5rem 0 1rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.track-page__sort {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.track-page__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}

.track-page__search-wrap {
  flex: 1 1 360px;
  max-width: 560px;
  min-width: 220px;
  position: relative;
}

.track-page__search-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--faint);
}

.track-page__search-input {
  width: 100%;
  height: 2.2rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  padding: 0 0.75rem 0 2.2rem;
}

.track-page__search-input:focus {
  outline: none;
  border-color: var(--border-strong);
}

.track-page__toolbar-right {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
}

.track-page__toolbar-count {
  font-size: 0.9rem;
  color: var(--muted);
}

.track-page__sort-select-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  position: relative;
}

.track-page__sort-select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  height: 2.2rem;
  border: 1px solid var(--border);
  border-radius: 0.45rem;
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  padding: 0 2rem 0 0.65rem;
  min-width: 130px;
}

.track-page__sort-select:focus {
  outline: none;
  border-color: var(--border-strong);
}

.track-page__sort-chevron {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--faint);
}

.track-page__sort-label {
  color: var(--muted);
  font-size: 0.9rem;
}

.track-page__sort-pills {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.track-page__topic-pills {
  margin: -0.1rem 0 1rem;
}

.track-page__sort-pill {
  font-size: 0.85rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.22rem 0.62rem;
  text-decoration: none;
  background: transparent;
}

.track-page__sort-pill:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.track-page__sort-pill.is-active {
  color: var(--text);
  background: var(--search-muted);
  border-color: var(--border-strong);
}

.track-posts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.track-posts > li {
  border-top: 1px solid var(--border);
  padding: 0.75rem 0;
}

.track-posts > li:last-child {
  border-bottom: 1px solid var(--border);
}

.track-post-item {
  display: grid;
  grid-template-columns: 3.7rem minmax(0, 1fr);
  gap: 0.7rem;
  align-items: start;
}

.track-post-thumb {
  width: 3.7rem;
  height: 3.7rem;
  border-radius: 0.45rem;
  overflow: hidden;
  display: block;
  border: 1px solid var(--border);
  background: var(--search-muted);
}

.track-post-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.track-post-thumb__placeholder {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #d8d8d8, #efefef);
}

.track-post-main {
  min-width: 0;
}

.track-post {
  text-decoration: none;
}

.track-post__title {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.35;
  font-weight: 600;
  color: var(--text);
}

.track-post:hover .track-post__title {
  color: var(--link-blue);
}

.track-post__excerpt {
  margin: 0.2rem 0 0.45rem;
  color: var(--text-70);
  font-size: 0.89rem;
  line-height: 1.45;
}

.track-post__meta {
  color: var(--faint);
  font-size: 0.8rem;
}

/* 文章详情页（对齐 rd.me/xxx） */
.article-page {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
}

.article-page__back {
  margin: 0 0 1rem;
}

.article-page__back a {
  text-decoration: none;
  color: var(--muted);
}

.article-page__back a:hover {
  color: var(--text);
}

.article-page__head {
  margin-bottom: 0.5rem;
}

.article-page__meta {
  margin-top: 0.45rem;
}

.topic-inline-link {
  display: inline-flex;
  align-items: center;
  padding: 0.08rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.45;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.topic-inline-link:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--search-muted);
}

.article-page__excerpt {
  margin: 0.6rem 0 1.1rem;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-70);
}

.article-page__hero {
  margin: 0.8rem 0 1.25rem;
}

.article-page__hero img {
  width: 100%;
  max-height: 460px;
  object-fit: cover;
  border-radius: 0.65rem;
  display: block;
}

.article-page__hero-placeholder {
  width: 100%;
  min-height: 240px;
  border-radius: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background:
    radial-gradient(circle at 20% 20%, #e8e8e8, transparent 45%),
    radial-gradient(circle at 80% 25%, #dedede, transparent 40%),
    linear-gradient(135deg, #f2f2f2, #e6e6e6);
  color: #7a7a7a;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

.article-page__hero-caption {
  text-align: center;
  margin-top: 0.45rem;
  font-size: 0.82rem;
  color: var(--faint);
}

.article-page__body {
  font-size: 1.02rem;
  line-height: 1.78;
}

.panel {
  margin-top: 2rem;
}

.panel__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.article-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
}

.article-list li {
  border-bottom: 1px solid var(--border);
}

.article-list a {
  display: block;
  padding: 1rem 0;
  text-decoration: none;
}

.article-list a:hover .article-list__title {
  text-decoration: underline;
}

.article-list__title {
  font-weight: 500;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.article-list__meta {
  font-size: 0.8rem;
  color: var(--faint);
}

.article-view__head {
  margin-bottom: 1.5rem;
}

.article-view__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.article-view__meta {
  font-size: 0.875rem;
  color: var(--faint);
}

.article-view__body {
  color: var(--text-70);
  font-size: 1rem;
  line-height: 1.75;
}

.article-view__body img {
  border-radius: var(--radius);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.topic-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}

.topic-card:hover {
  background: var(--search-muted);
}

.topic-card__name {
  font-weight: 500;
  font-size: 0.95rem;
}

.topic-card__desc {
  margin-top: 0.3rem;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
}

.topic-card__meta {
  font-size: 0.75rem;
  color: var(--faint);
  margin-top: 0.25rem;
}

.muted-page {
  color: var(--muted);
  font-size: 0.95rem;
}

.pagination {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.pagination button {
  font-family: inherit;
  font-size: 0.875rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  cursor: pointer;
  color: var(--text);
}

.pagination button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.pagination button:not(:disabled):hover {
  background: var(--search-muted);
}

/* —— 页脚：社交行 + 顶部分隔 + 版权行（rd.me） —— */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--hairline);
  padding-top: 2rem;
  margin-left: auto;
  margin-right: auto;
  max-width: var(--content-max);
  padding-left: 1rem;
  padding-right: 1rem;
}

.footer-social {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.footer-social a {
  color: var(--text-60);
  display: flex;
  transition: color 0.15s ease;
}

.footer-social a:hover {
  color: var(--text);
  opacity: 1;
}

.footer-social svg {
  width: 1.5rem;
  height: 1.5rem;
}

.footer-legal {
  text-align: center;
  padding-bottom: 2rem;
}

.footer-legal__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-60);
}

.footer-legal__row a.link-nav {
  color: inherit;
  text-decoration: none;
}

.footer-legal__row a.link-nav:hover {
  text-decoration: underline;
  color: var(--text);
  opacity: 1;
}

.footer-dot {
  user-select: none;
}

.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 8vh 1rem;
}

.search-overlay.is-open {
  display: flex;
}

.search-modal {
  width: 100%;
  max-width: 520px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

@media (prefers-color-scheme: dark) {
  .search-modal {
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  }
}

.search-modal__head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border);
}

.search-modal__head input {
  flex: 1;
  border: none;
  font: inherit;
  font-size: 1rem;
  outline: none;
  min-width: 0;
  background: transparent;
  color: var(--text);
}

.search-modal__hint {
  font-size: 0.7rem;
  color: var(--faint);
}

.search-modal__list {
  max-height: 50vh;
  overflow: auto;
  margin: 0;
  padding: 0;
  list-style: none;
}

.search-modal__list button {
  width: 100%;
  text-align: left;
  padding: 0.65rem 0.85rem;
  border: none;
  background: none;
  font: inherit;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.search-modal__list button:hover {
  background: var(--search-muted);
}

.search-modal__empty {
  padding: 1.5rem 0.85rem;
  color: var(--faint);
  font-size: 0.875rem;
}

.hidden {
  display: none !important;
}