:root {
  color-scheme: light dark;
  --ink: #15171a;
  --muted: #646b73;
  --faint: #8e969f;
  --paper: #ffffff;
  --surface: #ffffff;
  --line: #e5e8ec;
  --line-strong: #c3cad3;
  --brand: #07559d;
  --brand-dark: #063c70;
  --accent: #8a5d22;
  --header-bg: rgb(255 255 255 / 86%);
  --panel-bg: rgb(255 255 255 / 90%);
  --glass-bg: rgb(255 255 255 / 90%);
  --nav-glass-bg: linear-gradient(180deg, rgb(255 255 255 / 99%), rgb(255 255 255 / 95%));
  --panel-border: rgb(7 85 157 / 14%);
  --card-border: rgb(21 23 26 / 10%);
  --hover-bg: rgb(7 85 157 / 8%);
  --hover-border: rgb(7 85 157 / 36%);
  --focus-ring: rgb(7 85 157 / 12%);
  --preview-backdrop: rgb(255 255 255 / 84%);
  --shadow: 0 24px 80px rgb(21 23 26 / 8%);
  --max: 1180px;
  --radius: 8px;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", SimSun, serif;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f4f7fb;
    --muted: #aab4c0;
    --faint: #7e8996;
    --paper: #0d1014;
    --surface: #141922;
    --line: #262d36;
    --line-strong: #3a4654;
    --brand: #77baff;
    --brand-dark: #b3d8ff;
    --accent: #d2a765;
    --header-bg: rgb(13 16 20 / 86%);
    --panel-bg: rgb(20 25 34 / 78%);
    --glass-bg: rgb(20 25 34 / 72%);
    --nav-glass-bg: linear-gradient(180deg, rgb(20 25 34 / 98%), rgb(20 25 34 / 92%));
    --panel-border: rgb(119 186 255 / 22%);
    --card-border: rgb(255 255 255 / 10%);
    --hover-bg: rgb(119 186 255 / 12%);
    --hover-border: rgb(119 186 255 / 40%);
    --focus-ring: rgb(119 186 255 / 18%);
    --preview-backdrop: rgb(20 25 34 / 84%);
    --shadow: 0 24px 80px rgb(0 0 0 / 34%);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
  text-wrap: pretty;
}

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

img {
  display: block;
  max-width: 100%;
}

code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--card-border);
  background: var(--header-bg);
  backdrop-filter: blur(18px);
}

.nav-shell {
  width: min(var(--max), calc(100% - 36px));
  height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  color: var(--brand-dark);
}

.brand-mark {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--surface);
  box-shadow: 0 0 0 1px var(--line-strong);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-toggle {
  display: none;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 8px 13px;
  border-radius: 999px;
  color: var(--muted);
  transition: color 180ms ease, background 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--brand-dark);
  background: var(--hover-bg);
  outline: none;
}

.nav-links .github-link {
  width: 44px;
  height: 44px;
  min-height: 44px;
  justify-content: center;
  padding: 0;
}

.nav-links .github-link svg {
  display: block;
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.section-shell,
.site-footer {
  width: min(var(--max), calc(100% - 36px));
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  max-width: 920px;
  font-size: 5.55rem;
}

h2 {
  font-size: 4.25rem;
}

.section-heading p {
  max-width: 660px;
  color: var(--muted);
  font-size: 1.12rem;
}

.section-shell {
  padding: 92px 0;
  border-top: 1px solid var(--line);
}

.journal-section {
  border-top: 0;
  padding-top: 72px;
}

.section-heading {
  margin-bottom: 42px;
}

.section-heading p:last-child {
  margin-bottom: 0;
}

.journal-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 42px;
  align-items: start;
}

.issue-link {
  grid-template-columns: 1fr;
  align-items: center;
}

.journal-list {
  display: grid;
  gap: 18px;
}

.issue-block {
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--surface);
}

.issue-heading {
  color: var(--brand-dark);
  font-family: var(--serif);
  font-size: 1.34rem;
  line-height: 1.3;
}

.issue-heading small {
  display: block;
  margin-top: 8px;
  color: var(--faint);
  font-family: var(--sans);
  font-size: 0.86rem;
}

.paper-stack {
  display: grid;
  gap: 10px;
}

.paper-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: baseline;
  min-height: 64px;
  padding: 17px 18px;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--panel-bg);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.paper-row:hover,
.paper-row:focus-visible {
  transform: translateY(-2px);
  border-color: var(--hover-border);
  background: var(--surface);
  outline: none;
}

.paper-title {
  font-family: var(--serif);
  font-size: 1.26rem;
  line-height: 1.35;
}

.paper-meta {
  color: var(--muted);
  white-space: nowrap;
}

.timeline {
  position: relative;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 42px;
  align-items: start;
}

.timeline-rail {
  position: sticky;
  top: 94px;
  max-height: calc(100svh - 124px);
  overflow: auto;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.timeline-step {
  width: 100%;
  min-height: 66px;
  display: grid;
  gap: 3px;
  align-content: center;
  border: 0;
  border-radius: 6px;
  padding: 10px 12px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease, color 180ms ease;
}

.timeline-step:hover,
.timeline-step:focus-visible,
.timeline-step.is-active {
  background: var(--hover-bg);
  color: var(--brand-dark);
  outline: none;
}

.timeline-step span {
  font-family: var(--serif);
  font-size: 1.18rem;
  line-height: 1.2;
}

.timeline-step small {
  color: currentColor;
  opacity: 0.72;
}

.timeline-feature-list {
  display: grid;
  gap: 32px;
  scroll-snap-type: y proximity;
}

.timeline-feature {
  min-height: calc(100svh - 124px);
  display: grid;
  align-items: center;
  scroll-snap-align: start;
}

.timeline-feature-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.timeline-feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.timeline-feature-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  max-height: calc(100svh - 220px);
}

figcaption {
  padding: 12px 13px 14px;
}

figcaption strong,
figcaption span {
  display: block;
}

figcaption strong {
  line-height: 1.35;
}

figcaption span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.9rem;
}

.split-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 24px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.gallery-card {
  display: block;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 0;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.gallery-card:hover,
.gallery-card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--hover-border);
  box-shadow: var(--shadow);
  outline: none;
}

.gallery-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.gallery-caption {
  display: block;
  padding: 12px 13px 14px;
}

.gallery-caption strong,
.gallery-caption span {
  display: block;
}

.gallery-caption strong {
  line-height: 1.35;
}

.gallery-caption span {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.9rem;
}

.preview-modal[hidden] {
  display: none;
}

.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 28px;
}

.preview-backdrop {
  position: absolute;
  inset: 0;
  border: 0;
  background: var(--preview-backdrop);
  backdrop-filter: blur(18px);
  cursor: zoom-out;
}

.preview-frame {
  position: relative;
  z-index: 1;
  width: fit-content;
  max-width: calc(100vw - 56px);
  max-height: calc(100svh - 56px);
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 34px 120px rgb(0 0 0 / 38%);
}

.preview-frame img {
  width: auto;
  height: auto;
  max-width: calc(100vw - 56px);
  max-height: calc(100svh - 158px);
  object-fit: contain;
  margin: 0 auto;
  background: transparent;
}

.preview-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--ink);
  font-size: 1.65rem;
  line-height: 1;
  cursor: pointer;
}

.preview-close:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.is-preview-open {
  overflow: hidden;
}

.empty-state {
  margin: 0;
  padding: 28px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  color: var(--muted);
  background: var(--panel-bg);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 0 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 920px) {
  h1 {
    font-size: 5.25rem;
  }

  h2 {
    font-size: 3.35rem;
  }

  .journal-layout,
  .issue-block,
  .timeline {
    grid-template-columns: 1fr;
  }

  .issue-index {
    position: sticky;
    z-index: 10;
    top: 74px;
    max-height: none;
    overflow: hidden;
  }

  #issue-index-list {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    overflow: auto hidden;
  }

  .issue-link {
    min-width: 148px;
    gap: 10px;
    border: 1px solid var(--line);
  }

  .timeline {
    gap: 22px;
  }

  .timeline-rail {
    z-index: 10;
    display: flex;
    gap: 8px;
    top: 74px;
    max-height: none;
    overflow: auto hidden;
  }

  .timeline-step {
    min-width: 148px;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-feature {
    min-height: 70svh;
  }
}

@media (max-width: 640px) {
  .nav-shell {
    position: relative;
    width: min(var(--max), calc(100% - 28px));
    height: auto;
    min-height: 62px;
    padding: 10px 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px 12px;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
    display: inline-flex;
    flex-direction: column;
    place-items: center;
    justify-content: center;
    gap: 4px;
    line-height: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
  }

  .nav-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .nav-shell.is-open .nav-toggle span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .nav-shell.is-open .nav-toggle span:nth-child(2) {
    opacity: 0;
  }

  .nav-shell.is-open .nav-toggle span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    width: 100%;
    padding: 12px 12px 14px;
    border-top: 1px solid var(--line);
    background: var(--nav-glass-bg);
    backdrop-filter: blur(18px) saturate(145%);
    -webkit-backdrop-filter: blur(18px) saturate(145%);
    box-shadow: 0 16px 40px rgb(21 23 26 / 8%);
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    z-index: 15;
  }

  .nav-shell.is-open .nav-links {
    display: flex;
  }

  .nav-links a {
    justify-content: flex-start;
    min-height: 44px;
    padding-inline: 14px;
  }

  .nav-links .github-link {
    width: 100%;
    justify-content: flex-start;
    padding-inline: 14px;
  }

  .section-shell,
  .site-footer {
    width: min(var(--max), calc(100% - 28px));
  }

  h1 {
    font-size: 3.18rem;
  }

  h2 {
    font-size: 2.42rem;
  }

  .paper-row,
  .split-heading {
    grid-template-columns: 1fr;
  }

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

  .timeline-feature {
    min-height: auto;
  }

  .timeline-feature-list {
    gap: 22px;
  }

  .timeline-feature-card img {
    max-height: none;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .paper-meta {
    white-space: normal;
  }

  .section-shell {
    padding: 68px 0;
  }

  .site-footer {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}