:root {
  --ink: #1d1a16;
  --paper: #faf7f0;
  --paper-2: #f2ece0;
  --muted: #6b6255;
  --rule: #d8cfbe;
  --accent: #7a4b2b;
  --accent-soft: #9a6a45;
  --zh: #2a2620;
  --draft: #b25a00;
  --link: #1f5fa8;
  --max: 1180px;
  --serif: Georgia, 'Songti SC', 'Noto Serif', 'Times New Roman', serif;
  --zh-serif: 'Songti SC', 'Noto Serif CJK SC', 'PMingLiU', 'Source Han Serif SC', serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
}
.hidden { display: none !important; }

/* ---- Sign-in ---- */
.signin {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 30%, var(--paper-2), var(--paper));
}
.signin-card {
  text-align: center;
  padding: 2.5rem;
  max-width: 420px;
}
.book-zh { font-family: var(--zh-serif); font-size: 2.6rem; margin: 0; letter-spacing: 0.15em; }
.book-en { color: var(--muted); margin: 0.2rem 0 1.4rem; }
.signin-note { color: var(--muted); font-size: 0.95rem; margin-bottom: 1.5rem; }
.signin-fallback { color: var(--draft); font-size: 0.9rem; }

/* ---- Top bar ---- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 1.2rem;
  padding: 0.6rem 1.2rem;
  background: rgba(250, 247, 240, 0.96);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: blur(6px);
}
.brand {
  font-family: var(--zh-serif); font-size: 1.25rem; font-weight: 600;
  background: none; border: none; cursor: pointer; color: var(--ink);
  letter-spacing: 0.08em;
}
.brand-en { font-family: var(--serif); font-size: 0.7rem; color: var(--muted); letter-spacing: 0; }
.topnav { display: flex; gap: 1rem; flex: 1; }
.topnav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; padding: 0.2rem 0; border-bottom: 2px solid transparent; }
.topnav a:hover { color: var(--ink); }
.topnav a.active { color: var(--accent); border-bottom-color: var(--accent); }
.topbar-right { display: flex; align-items: center; gap: 1rem; }
.mode-toggle { display: flex; align-items: center; gap: 0.4rem; font-size: 0.85rem; color: var(--muted); cursor: pointer; }
.mode-toggle input { cursor: pointer; }

/* ---- Layout ---- */
.view { max-width: var(--max); margin: 0 auto; padding: 2rem 1.2rem 6rem; }
h1, h2, h3 { font-weight: 600; line-height: 1.3; }
a { color: var(--link); }

/* ---- Table of contents ---- */
.toc-head { text-align: center; margin-bottom: 2.5rem; }
.toc-head .zh { font-family: var(--zh-serif); font-size: 2.4rem; letter-spacing: 0.12em; margin: 0; }
.toc-head .en { color: var(--muted); font-style: italic; }
.toc-note { font-size: 0.85rem; color: var(--muted); background: var(--paper-2); border-left: 3px solid var(--accent-soft); padding: 0.6rem 0.9rem; border-radius: 4px; }
.toc-list { list-style: none; padding: 0; margin: 1.5rem 0; }
.toc-item { display: flex; align-items: baseline; gap: 0.9rem; padding: 0.7rem 0.4rem; border-bottom: 1px solid var(--rule); cursor: pointer; }
.toc-item:hover { background: var(--paper-2); }
.toc-num { font-size: 0.8rem; color: var(--muted); min-width: 4.5rem; }
.toc-zh { font-family: var(--zh-serif); font-size: 1.15rem; }
.toc-en { color: var(--muted); font-style: italic; flex: 1; }
.badge { font-size: 0.68rem; padding: 0.1rem 0.45rem; border-radius: 999px; white-space: nowrap; }
.badge-draft { background: #fbe9d3; color: var(--draft); border: 1px solid #eab87f; }
.badge-cond { background: #e7e0f3; color: #5a3da0; border: 1px solid #c3b4e6; }

/* ---- Chapter ---- */
.chapter-head { margin-bottom: 1.4rem; }
.chapter-kicker { color: var(--muted); font-size: 0.85rem; letter-spacing: 0.1em; text-transform: uppercase; }
.chapter-zh { font-family: var(--zh-serif); font-size: 2rem; margin: 0.2rem 0; letter-spacing: 0.08em; }
.chapter-en { color: var(--accent); font-style: italic; font-size: 1.2rem; margin: 0; }
.chapter-meta { color: var(--muted); font-size: 0.82rem; margin-top: 0.5rem; display: flex; gap: 0.8rem; flex-wrap: wrap; align-items: center; }
.chapter-meta button { font: inherit; font-size: 0.82rem; color: var(--link); background: none; border: none; cursor: pointer; padding: 0; text-decoration: underline; }

.draft-banner { background: #fbe9d3; border: 1px solid #eab87f; color: #8a4a00; padding: 0.5rem 0.8rem; border-radius: 5px; font-size: 0.85rem; margin-bottom: 1.4rem; }

/* 3-column grid: English / Chinese / comment-pill gutter. Pill lives in its
   own column so it never overlaps text and never overflows the viewport. */
.para-row { display: grid; grid-template-columns: 1fr 1fr 2.6rem; gap: 1.4rem; padding: 0.5rem 0; position: relative; }
body.english-only .para-row { grid-template-columns: 1fr 2.6rem; }
body.english-only .para-zh { display: none; }
.para-en { }
.para-zh { font-family: var(--zh-serif); color: var(--zh); line-height: 2; text-align: justify; }
.para-zh.draft { color: #8a8270; }
.para-zh-missing { color: var(--muted); font-style: italic; font-family: var(--serif); font-size: 0.85rem; }
.para-row.verse { grid-template-columns: 1fr 2.6rem; }
.para-row.condensation .para-en { border-left: 3px solid #c3b4e6; padding-left: 0.8rem; }

.verse { border: none; margin: 1.4rem auto; padding: 0; max-width: 40rem; text-align: center; color: var(--zh); }
.verse-line { font-family: var(--zh-serif); }
.verse .verse-line:lang(en) { font-family: var(--serif); }
.verse-gap { height: 0.6rem; }
.verse-attr { color: var(--muted); font-style: italic; font-size: 0.9rem; margin-top: 0.3rem; }

/* footnote refs + popover */
.fn-ref { line-height: 0; }
.fn-link { background: none; border: none; color: var(--accent); cursor: pointer; font-size: 0.7em; padding: 0 0.1em; }
.fn-link:hover { color: var(--accent-soft); }
.fn-pop { position: absolute; z-index: 30; background: var(--paper); border: 1px solid var(--rule); box-shadow: 0 6px 24px rgba(0,0,0,0.15); padding: 0.8rem 1rem; border-radius: 6px; max-width: 360px; font-size: 0.85rem; line-height: 1.5; }
.fn-pop .fn-num { color: var(--accent); font-weight: 600; margin-right: 0.3rem; }

/* comment affordance — sits in the row's dedicated 3rd grid column */
.para-actions { align-self: start; justify-self: end; margin-top: 0.2rem; opacity: 0.4; transition: opacity 0.15s; }
.para-row:hover .para-actions { opacity: 1; }
.para-actions:has(.has-threads) { opacity: 1; }
.cmt-btn {
  display: inline-flex; align-items: center; gap: 0.3rem;
  background: var(--paper-2); border: 1px solid var(--rule); border-radius: 999px;
  cursor: pointer; color: var(--muted); font-size: 0.9rem;
  padding: 0.15rem 0.55rem; line-height: 1.4;
}
.cmt-btn:hover { background: var(--paper); color: var(--accent); border-color: var(--accent-soft); }
.cmt-btn.has-threads { color: var(--accent); background: #fbe9d3; border-color: #eab87f; }
.cmt-count { font-size: 0.72rem; font-weight: 600; }

/* threads panel */
.threads { position: relative; grid-column: 1 / -1; background: var(--paper-2); border: 1px solid var(--rule); border-radius: 6px; padding: 0.9rem 2.2rem 0.9rem 1rem; margin: 0.4rem 0; }
.threads-close { position: absolute; top: 0.4rem; right: 0.5rem; background: none; border: none; color: var(--muted); cursor: pointer; font-size: 1.3rem; line-height: 1; padding: 0.2rem 0.5rem; border-radius: 4px; }
.threads-close:hover { color: var(--ink); background: var(--paper); }
.thread { border-bottom: 1px solid var(--rule); padding: 0.6rem 0; }
.thread:last-child { border-bottom: none; }
.thread.resolved { opacity: 0.6; }
.comment { margin: 0.4rem 0; }
.comment-meta { font-size: 0.75rem; color: var(--muted); }
.comment-quote { border-left: 3px solid var(--accent-soft); padding-left: 0.6rem; color: var(--muted); font-style: italic; margin: 0.2rem 0; font-size: 0.9rem; }
.comment-body { font-size: 0.95rem; }
.thread-actions, .comment-actions { display: flex; gap: 0.6rem; margin-top: 0.3rem; }
.thread-actions button, .comment-actions button { font-size: 0.75rem; background: none; border: none; color: var(--link); cursor: pointer; padding: 0; }
textarea { width: 100%; font: inherit; font-size: 0.9rem; padding: 0.5rem; border: 1px solid var(--rule); border-radius: 5px; resize: vertical; background: var(--paper); }
.composer .section-search { font-size: 0.9rem; padding: 0.5rem; margin: 0 0 0.5rem; }
.composer-label { display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 0.5rem 0 0.25rem; }
.composer-label:first-child { margin-top: 0; }
.btn { background: var(--accent); color: #fff; border: none; padding: 0.4rem 0.9rem; border-radius: 5px; cursor: pointer; font: inherit; font-size: 0.85rem; }
.btn.secondary { background: none; color: var(--muted); border: 1px solid var(--rule); }
.btn:disabled { opacity: 0.5; cursor: default; }

/* glossary + editorial */
.section-search { width: 100%; padding: 0.6rem 0.8rem; font: inherit; border: 1px solid var(--rule); border-radius: 6px; margin-bottom: 1.4rem; background: var(--paper); }
.gloss-section h2, .ed-section h2 { border-bottom: 2px solid var(--rule); padding-bottom: 0.3rem; }
.gloss-group { margin: 1rem 0; }
.gloss-group h3 { color: var(--muted); font-size: 0.9rem; }
.gloss-entry, .ed-decision { position: relative; padding: 0.4rem 0; border-bottom: 1px solid var(--paper-2); }
.gloss-entry:hover, .ed-decision:hover { background: var(--paper-2); }
.ed-decision { padding: 1rem 0; border-bottom: 1px solid var(--rule); }
.ed-decision h3 { color: var(--accent); margin: 0 0 0.4rem; }
.ed-applied { font-size: 0.8rem; color: var(--muted); }

/* chapter nav footer */
.chapter-nav { display: flex; justify-content: space-between; margin-top: 3rem; border-top: 1px solid var(--rule); padding-top: 1rem; }
.chapter-nav button { background: none; border: none; color: var(--accent); cursor: pointer; font: inherit; }

/* activity */
.activity-item { padding: 0.7rem 0; border-bottom: 1px solid var(--rule); cursor: pointer; }
.activity-anchor { font-size: 0.78rem; color: var(--muted); }

/* lightbox */
.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,0.85); display: grid; place-items: center; z-index: 100; }
.lightbox img { max-width: 92vw; max-height: 92vh; box-shadow: 0 0 40px rgba(0,0,0,0.5); }
.lightbox-close { position: absolute; top: 1rem; right: 1.4rem; background: none; border: none; color: #fff; font-size: 2.4rem; cursor: pointer; }

.empty { color: var(--muted); font-style: italic; text-align: center; padding: 3rem 0; }
.loading { color: var(--muted); text-align: center; padding: 3rem 0; }

@media (max-width: 720px) {
  body { font-size: 16px; }
  /* Two-row layout: English + pill share the top row so the widget sits at
     the START of its paragraph (aligned with the first English line); the
     Chinese block spans the full width below. This anchors the pill INSIDE
     the row, eliminating the floating "between-paragraph" position that
     made it ambiguous which paragraph it belonged to. */
  .para-row {
    grid-template-columns: 1fr 3rem;
    grid-template-areas:
      "english actions"
      "chinese chinese";
    column-gap: 0.4rem;
    row-gap: 0.3rem;
  }
  body.english-only .para-row,
  .para-row.verse {
    grid-template-areas: "english actions";
  }
  .para-row > .para-en { grid-area: english; }
  .para-row > .para-zh { grid-area: chinese; border-left: 2px solid var(--rule); padding-left: 0.7rem; }
  .para-row > .para-actions { grid-area: actions; align-self: start; justify-self: end; margin-top: 0.2rem; opacity: 1; }
  .topnav { gap: 0.7rem; font-size: 0.85rem; }
  .mode-toggle span { display: none; }
}