:root {
  color-scheme: light;
  --paper: #f7f7f4;
  --ink: #202020;
  --muted: #686868;
  --line: #d9d7cf;
  --accent: #28666e;
  --accent-2: #1f7a4d;
  --blocked: #8c3326;
  --panel: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans Thai Looped", "IBM Plex Sans Thai", system-ui, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem clamp(1rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
  background: rgba(247, 247, 244, 0.95);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  letter-spacing: 0;
}

.session-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.session-nav a,
.inline-form button {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--accent);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

.inline-form {
  margin: 0;
}

.shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 2rem auto 4rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(240px, 0.8fr);
  gap: 2rem;
  align-items: end;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1.02;
  margin: 0 0 1rem;
}

.auth-layout {
  display: grid;
  place-items: start center;
}

.auth-panel {
  width: min(100%, 460px);
}

.login-form {
  display: grid;
  gap: 0.85rem;
}

.login-form label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
}

.login-form input,
.login-form select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 0.45rem 0.55rem;
}

.form-error {
  border-left: 4px solid var(--blocked);
  background: #fff1ed;
  color: var(--blocked);
  padding: 0.5rem 0.75rem;
}

.hero p,
.muted {
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.book-card,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1rem;
}

.book-card h2,
.panel h2,
.panel h3 {
  line-height: 1.2;
  margin-top: 0;
}

.badge {
  display: inline-block;
  padding: 0.15rem 0.45rem;
  border: 1px solid var(--line);
  font-size: 0.8rem;
  text-transform: uppercase;
}

.badge.preview {
  color: var(--accent);
}

.badge.blocked {
  color: var(--blocked);
  border-color: color-mix(in srgb, var(--blocked), var(--line));
}

.badge.fixture {
  color: #5b4f00;
  border-color: #b8a746;
}

.book-layout {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

.chapter-workspace {
  display: grid;
  gap: 1rem;
}

.workspace-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.workspace-bar h1 {
  margin: 0;
  font-size: 1.8rem;
  line-height: 1.15;
}

.eyebrow {
  margin: 0 0 0.25rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.toc {
  position: sticky;
  top: 5rem;
}

.toc ol {
  padding-left: 1.2rem;
}

.block {
  border-bottom: 1px solid var(--line);
  padding: 0.7rem 0;
  scroll-margin-top: 5.5rem;
}

.block.has-review {
  border-left: 4px solid #e5c84c;
  padding-left: 0.8rem;
}

.block.is-selected {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.block:target {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.block pre {
  overflow-x: auto;
  background: #f2f2ef;
  padding: 1rem;
  border-left: 4px solid var(--accent);
}

.image-placeholder {
  margin: 1rem 0;
}

.placeholder-box {
  aspect-ratio: 16 / 9;
  border: 1px dashed #8d8a80;
  background:
    linear-gradient(135deg, transparent calc(50% - 1px), #bbb7aa 50%, transparent calc(50% + 1px)),
    linear-gradient(45deg, transparent calc(50% - 1px), #bbb7aa 50%, transparent calc(50% + 1px)),
    #f3f1ea;
}

.image-placeholder figcaption {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.45rem;
}

.review {
  border-left: 4px solid #e5c84c;
  padding: 0.5rem 0.75rem;
  background: #fff9d6;
  margin: 0.75rem 0;
}

.review.green {
  border-left-color: #5a8c51;
  background: #edf7e7;
}

.review.blue {
  border-left-color: #4e7897;
  background: #eaf3f8;
}

.review.pink {
  border-left-color: #bb6c87;
  background: #fbedf2;
}

.review-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
}

.review-target-link {
  font-size: 0.85rem;
  white-space: nowrap;
}

.selected-quote {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
}

.review-highlight {
  padding: 0 0.08em;
  border-radius: 2px;
}

.review-highlight.yellow {
  background: #ffef93;
}

.review-highlight.green {
  background: #cfecc4;
}

.review-highlight.blue {
  background: #c9e4f3;
}

.review-highlight.pink {
  background: #f4c9d8;
}

.index-marker {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.index-page h1 {
  margin-top: 0;
}

.index-term {
  border-top: 1px solid var(--line);
  padding: 0.6rem 0;
}

.index-term summary {
  cursor: pointer;
  font-weight: 700;
}

.index-term summary span {
  color: var(--muted);
  font-weight: 400;
  margin-left: 0.35rem;
}

.index-term ol {
  margin: 0.7rem 0 0;
  padding-left: 1.3rem;
}

.index-term li {
  margin-bottom: 0.8rem;
}

.index-term p {
  color: var(--muted);
  margin: 0.2rem 0 0;
}

.inline-reviews {
  margin: 0.75rem 0;
  padding: 0.45rem 0.7rem;
  background: #fff9d6;
  border: 1px solid #eadb86;
  font-size: 0.95rem;
}

.inline-reviews p {
  margin: 0.3rem 0;
}

.review-composer,
.block-create,
.block-editor {
  display: grid;
  gap: 0.65rem;
  margin: 1rem 0;
}

.review-composer label,
.block-create label,
.block-editor label {
  display: grid;
  gap: 0.3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.review-composer input,
.review-composer select,
.review-composer textarea,
.block-create select,
.block-create textarea,
.block-editor textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 0.45rem 0.55rem;
}

.block-editor textarea {
  font-family: "IBM Plex Mono", "Source Code Pro", ui-monospace, monospace;
}

.editor-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.form-status {
  color: var(--muted);
  font-size: 0.9rem;
  min-height: 1.4em;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 0.45rem 0.7rem;
  text-decoration: none;
  border-radius: 4px;
  font: inherit;
}

.button.secondary {
  background: var(--panel);
  color: var(--accent);
  border-color: var(--line);
}

.button.danger {
  background: #fff7f4;
  color: var(--blocked);
  border-color: color-mix(in srgb, var(--blocked), var(--line));
}

.button:disabled {
  opacity: 0.55;
  cursor: progress;
}

.package-actions {
  margin-top: 1.2rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
}

@media (max-width: 800px) {
  .hero,
  .book-layout {
    grid-template-columns: 1fr;
  }

  .workspace-bar {
    align-items: stretch;
    flex-direction: column;
  }

  .workspace-bar h1 {
    font-size: 1.4rem;
  }

  .toc {
    position: static;
  }
}