.topbar-nav a.is-current {
  color: var(--ink);
  font-weight: 600;
}

.doc-hero {
  padding: 28px 0 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.doc-hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.03em;
  margin: 6px 0 8px;
}

.doc-hero p {
  color: #3f3b35;
  max-width: none;
}

.chapter {
  padding-top: 8px;
}

.chapter > h2 {
  font-size: 26px;
  letter-spacing: -0.03em;
  margin: 18px 0 8px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.chapter > .lead {
  color: #3f3b35;
  margin-bottom: 8px;
}

.kv {
  width: 100%;
  margin: 12px 0;
  border: 1px solid var(--line);
  background: var(--sheet);
  border-collapse: collapse;
  font-size: 14px;
}

.kv th,
.kv td {
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.kv tr:last-child th,
.kv tr:last-child td {
  border-bottom: 0;
}

.kv th {
  width: 140px;
  background: #faf6ee;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.checks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
  margin: 12px 0 16px;
  font-size: 14px;
}

.crumbs {
  font-size: 13px;
  color: var(--mute);
}

.crumbs a {
  text-decoration: none;
}

.crumbs a:hover {
  color: var(--ink);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 12px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  color: var(--mute);
}

.dl-card {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 14px 18px;
  align-items: center;
  margin: 28px 0 8px;
  padding: 18px 20px;
  background: var(--sheet);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
}

.dl-card img {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
}

.dl-card h2 {
  font-size: 20px;
  letter-spacing: -0.02em;
  margin: 4px 0 8px;
}

.dl-card p {
  color: var(--mute);
  font-size: 14px;
}

.dl-card .actions {
  margin-top: 12px;
}

.dl-float {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 8px 12px;
  width: min(268px, calc(100vw - 28px));
  padding: 14px 32px 14px 14px;
  background: var(--sheet);
  border: 1px solid var(--ink);
  box-shadow: 0 14px 36px rgba(29, 27, 23, 0.14);
}

.dl-float.is-hidden {
  display: none;
}

.dl-float img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
}

.dl-float strong {
  display: block;
  font-size: 14px;
}

.dl-float p {
  margin-top: 2px;
  font-size: 12px;
  color: var(--mute);
}

.dl-float .btn {
  margin-top: 8px;
  min-height: 32px;
  padding: 0 10px;
  font-size: 13px;
}

.dl-float-close {
  position: absolute;
  top: 6px;
  right: 8px;
  width: 22px;
  height: 22px;
  color: var(--mute);
  font-size: 18px;
  line-height: 1;
}

.dl-float-close:hover {
  color: var(--ink);
}

body:has(.dl-float:not(.is-hidden)) .article {
  padding-bottom: 108px;
}

.toc {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin: 18px 0 8px;
}

.toc a {
  text-decoration: none;
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 10px 12px;
  font-size: 13px;
}

.toc a:hover {
  border-color: var(--ink);
}

.toc b {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 2px;
}

.lesson {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 16px 20px;
  align-items: start;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.lesson-text h2 {
  font-size: 22px;
  letter-spacing: -0.02em;
  margin: 4px 0 8px;
}

.lesson-text .step-no {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

.lesson-text p,
.lesson-text li {
  color: #3f3b35;
  font-size: 15px;
}

.lesson-text ul,
.lesson-text ol {
  margin-top: 10px;
}

.shot {
  margin: 0;
}

.shot img {
  width: 100%;
  display: block;
  background: #fff;
  border: 1px solid var(--line);
}

.shot figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--mute);
  font-family: "IBM Plex Mono", monospace;
}

.icon-card {
  display: flex;
  gap: 14px;
  align-items: center;
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 14px;
}

.icon-card img {
  width: 72px;
  height: 72px;
  border-radius: 16px;
}

.note,
.warn {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--sheet);
  border: 1px solid var(--line);
  font-size: 14px;
  color: var(--mute);
}

.warn {
  border-left: 3px solid var(--accent);
}

.note strong,
.warn strong {
  display: block;
  color: var(--ink);
  margin-bottom: 4px;
}

.log-list {
  margin-top: 4px;
}

.log-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 8px 24px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

.log-item:hover h3 {
  color: var(--accent);
}

.log-item time {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  color: var(--accent);
  padding-top: 4px;
}

.log-item h3 {
  font-size: 20px;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.log-item p {
  color: var(--mute);
  font-size: 14px;
  max-width: 46em;
}

.article .prose ul,
.article .prose ol {
  margin: 10px 0 0;
}

.article .prose li {
  color: #3f3b35;
  font-size: 15px;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 0 36px;
  border-top: 1px solid var(--line);
}

.pager a {
  text-decoration: none;
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: 12px 14px;
  min-width: 42%;
}

.pager a:hover {
  border-color: var(--ink);
}

.pager span {
  display: block;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--accent);
  margin-bottom: 4px;
}

.shot-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 14px 0 20px;
}

.shot-strip figure {
  margin: 0;
  background: var(--sheet);
  border: 1px solid var(--line);
}

.shot-strip img {
  width: 100%;
  display: block;
  background: #fff;
}

.shot-strip figcaption {
  padding: 6px 8px 8px;
  font-size: 11px;
  color: var(--mute);
}

.tutor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 18px;
}

.tutor-card {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 14px;
  text-decoration: none;
  background: var(--sheet);
  border: 1px solid var(--line);
  overflow: hidden;
}

.tutor-card img {
  width: 100%;
  height: 168px;
  object-fit: cover;
  object-position: top center;
  background: #ece8df;
}

.tutor-card div {
  padding: 14px 14px 14px 0;
}

.tutor-card span {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--accent);
}

.tutor-card h3 {
  font-size: 18px;
  margin: 4px 0 6px;
}

.tutor-card p {
  color: var(--mute);
  font-size: 14px;
}

.tutor-card:hover {
  border-color: var(--ink);
}

@media (max-width: 860px) {
  .lesson,
  .toc,
  .tutor-grid,
  .tutor-card,
  .checks {
    grid-template-columns: 1fr;
  }

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

  .shot-strip {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
  }

  .shot-strip figure {
    flex: 0 0 42%;
    scroll-snap-align: start;
  }

  .log-item,
  .dl-card {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .dl-card {
    padding: 14px 16px;
  }

  .dl-float {
    left: 12px;
    right: 12px;
    bottom: calc(12px + env(safe-area-inset-bottom));
    width: auto;
  }

  .kv,
  .kv tbody,
  .kv tr,
  .kv th,
  .kv td {
    display: block;
    width: 100%;
  }

  .kv th {
    width: auto;
    white-space: normal;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .kv td {
    padding-top: 4px;
  }

  .shot img {
    max-width: 220px;
  }

  .pager {
    flex-direction: column;
  }

  .pager a {
    min-width: 0;
  }

  .chapter > h2 {
    font-size: 22px;
  }

  .lesson-text h2 {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .toc {
    grid-template-columns: 1fr;
  }

  .shot-strip figure {
    flex: 0 0 58%;
  }

  .log-item h3 {
    font-size: 18px;
  }

  .dl-card h2 {
    font-size: 18px;
  }

  .icon-card {
    align-items: flex-start;
  }
}