:root {
  --paper: #f4efe6;
  --ink: #1c1915;
  --muted: #6e665c;
  --line: #d9d1c4;
  --card: #fbf7f0;
  --accent: #243f36;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

a {
  color: inherit;
}

.page {
  width: min(720px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 80px;
}

.masthead,
.card-meta,
.stats {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 5;
  justify-content: space-between;
  margin: -8px 0 22px;
  padding: 14px 0 12px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 15px;
}

.masthead button {
  appearance: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.brand {
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
}

.nav button {
  color: var(--muted);
}

.nav button.on {
  color: var(--ink);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--ink);
}

.quiet,
.text-link,
.topic-chip,
.toc-row,
.tag,
.archive-item {
  appearance: none;
  margin: 0;
  border: 0;
  background: none;
  font: inherit;
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.quiet {
  color: var(--muted);
  padding: 0;
}

.text-link {
  color: var(--ink);
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.text-link:hover {
  color: var(--accent);
}

.stats {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
}

.kicker {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px 16px;
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13px;
}

.kicker-tools {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 16px;
  margin-left: auto;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 560;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.lead {
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.6;
}

.toc {
  display: grid;
  gap: 2px;
  margin: 0 0 40px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.toc-row {
  display: grid;
  grid-template-columns: 2em 1fr auto;
  gap: 10px;
  width: 100%;
  padding: 12px 0;
  align-items: start;
}

.toc-row:hover .toc-title {
  text-decoration: underline;
}

.toc-main {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.num,
.toc-topic {
  color: var(--muted);
  font-size: 12px;
}

.toc-title {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.toc-dek {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.toc-state {
  color: var(--muted);
  font-size: 12px;
}

.piece {
  padding: 36px 0 8px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 64px;
}

.cover-block {
  margin-bottom: 18px;
}

.photo {
  height: 220px;
  overflow: hidden;
  border-radius: 8px;
  background: #ddd4c6;
}

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

.photo.is-broken img {
  display: none;
}

.photo-credit {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.fallback,
.photo.is-broken {
  display: grid;
  place-items: center;
  height: 160px;
  color: #f6f1e8;
  letter-spacing: 0.12em;
}

.photo.is-broken::after {
  content: attr(data-topic);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin: 0 0 16px;
}

.topic-chip {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
}

.topic-chip:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.topic-chip.on {
  border-color: var(--ink);
  background: var(--ink);
  color: #f6f1e8;
  font-weight: 600;
}

.topic-文化 { background: #3d4f6f; }
.topic-社会 { background: #5a3d6b; }
.topic-人物 { background: #6a5340; }
.topic-经济 { background: #5c3d2e; }
.topic-科学 { background: #2c4a3e; }
.topic-AI { background: #1f3d4a; }
.topic-健康 { background: #6b3a4a; }

.card-meta {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
}

.tag {
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.piece h2 {
  margin: 0 0 8px;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 26px;
  font-weight: 560;
  line-height: 1.25;
}

.summary,
.credit,
.note {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.done {
  color: #8a7d6b;
}

.prose {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  font-size: 19px;
  line-height: 1.7;
}

.prose p {
  margin: 0 0 1em;
}

.piece-foot {
  margin: 8px 0 40px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.piece-status,
.talk-status {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.piece-status:empty,
.talk-status[hidden] {
  display: none;
}

.piece-status .quiet {
  margin-left: 10px;
}

[data-talk-slot]:empty {
  display: none;
}

.btn,
.button {
  appearance: none;
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  background: var(--accent);
  color: #f6f1e8;
  font: inherit;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
}

.btn.ghost,
.button.ghost {
  background: transparent;
  color: var(--accent);
}

.masthead .brand,
.masthead .nav button {
  display: inline-block;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 15px;
  font-weight: 400;
  box-shadow: none;
}

.masthead .brand {
  color: var(--ink);
}

.masthead .nav button.on {
  color: var(--ink);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--ink);
}

.archive-list {
  display: grid;
  gap: 10px;
}

.archive-item {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.archive-item span {
  color: var(--muted);
  font-size: 13px;
}

.error {
  color: #8a2b2b;
}

@media (max-width: 640px) {
  .page {
    width: calc(100% - 28px);
  }

  .toc-row {
    grid-template-columns: 2em 1fr auto;
  }

  .toc-topic {
    display: none;
  }

  .piece h2 {
    font-size: 22px;
  }

  .prose {
    font-size: 18px;
  }
}