/* ============================================================
   Gengo Library — visual style
   Inspired by the app's reading aesthetics: paper-cream background,
   serif Japanese, accent red for hanko-style highlights.
   ============================================================ */

:root {
  --bg: #F5EFE2;
  --paper: #FBF6E7;
  --fg: #2A2520;
  --subtle: #8B8678;
  --accent: #A82820;
  --accent-soft: #C9A872;
  --border: #D9D2BE;
  --shadow: 0 2px 10px rgba(0,0,0,0.08);
  --shadow-strong: 0 12px 36px rgba(0,0,0,0.18);

  --font-sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", system-ui, sans-serif;
  --font-jp: "Yu Mincho", "Hiragino Mincho ProN", "MS Mincho", serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --max-width: 1100px;
  --reader-width: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Header ===== */
header.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
header.site-header .brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}
header.site-header .brand-mark {
  font-family: var(--font-jp);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent);
}
header.site-header .brand-name {
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.95rem;
}
header.site-header .tagline {
  color: var(--subtle);
  font-size: 0.85rem;
  font-style: italic;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  gap: 4px;
}
.lang-switcher button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--subtle);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 4px 8px;
  cursor: pointer;
  border-radius: 4px;
  font-family: var(--font-sans);
}
.lang-switcher button:hover { color: var(--fg); }
.lang-switcher button.active {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}

/* ===== Main layout ===== */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 24px 80px;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.2;
  color: var(--fg);
}
h1 {
  font-size: 2rem;
  margin: 0 0 4px;
  letter-spacing: 0.02em;
}
h2 {
  font-size: 1.4rem;
  margin: 32px 0 12px;
}

p.lead {
  color: var(--subtle);
  font-style: italic;
  font-size: 1rem;
  margin: 0 0 32px;
}

/* ===== Catalog grid ===== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 24px;
  flex-wrap: wrap;
}
.filter-bar .filter-label {
  font-size: 0.85rem;
  color: var(--subtle);
  margin-right: 4px;
}
.filter-bar button {
  background: transparent;
  border: 1px solid var(--border);
  padding: 6px 12px;
  cursor: pointer;
  border-radius: 16px;
  font-size: 0.85rem;
  color: var(--fg);
  font-family: var(--font-sans);
}
.filter-bar button:hover { background: var(--paper); }
.filter-bar button.active {
  background: var(--fg);
  color: var(--paper);
  border-color: var(--fg);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  margin-top: 16px;
}
.book-card {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.15s ease-out, box-shadow 0.15s;
}
.book-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.book-card .book-title-ja {
  font-family: var(--font-jp);
  font-size: 1.5rem;
  font-weight: 500;
  margin: 0 0 4px;
  color: var(--fg);
}
.book-card .book-title-tr {
  font-style: italic;
  color: var(--subtle);
  font-size: 0.95rem;
  margin: 0 0 12px;
}
.book-card .book-author {
  font-size: 0.85rem;
  color: var(--fg);
  margin: 0 0 12px;
}
.book-card .book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}
.book-card .badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 10px;
  font-weight: 500;
  letter-spacing: 0.04em;
}
.badge-level-beginner { background: #D7E9C0; color: #3F5C20; }
.badge-level-intermediate { background: #E8DDB5; color: #5C4A20; }
.badge-level-advanced { background: #E8C5C2; color: #6B1E1A; }
.badge-tokens { background: var(--border); color: var(--fg); }

/* ===== Book page ===== */
.book-page-header {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 32px;
}
.book-page-title-ja {
  font-family: var(--font-jp);
  font-size: 3rem;
  font-weight: 500;
  margin: 0 0 4px;
  line-height: 1.1;
}
.book-page-title-tr {
  font-style: italic;
  font-size: 1.2rem;
  color: var(--subtle);
  margin: 0 0 8px;
}
.book-page-author {
  font-size: 1rem;
  color: var(--fg);
  margin: 0 0 16px;
}
.book-page-summary {
  background: var(--paper);
  padding: 16px 20px;
  border-left: 3px solid var(--accent-soft);
  border-radius: 4px;
  font-size: 0.95rem;
  line-height: 1.6;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 16px 0;
  border-top: 1px solid var(--border);
}
.toc-list li {
  border-bottom: 1px solid var(--border);
}
.toc-list a {
  display: flex;
  padding: 12px 8px;
  color: var(--fg);
  text-decoration: none;
  align-items: baseline;
  gap: 12px;
}
.toc-list a:hover {
  background: var(--paper);
  text-decoration: none;
}
.toc-list .toc-num {
  color: var(--subtle);
  font-family: var(--font-serif);
  font-size: 0.9rem;
  min-width: 32px;
}
.toc-list .toc-title {
  font-family: var(--font-jp);
  font-size: 1.1rem;
}
.toc-list .toc-stats {
  margin-left: auto;
  color: var(--subtle);
  font-size: 0.8rem;
}

/* ===== Reader ===== */
.reader-toolbar {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  position: sticky;
  top: 76px;
  z-index: 50;
}
.reader-toolbar select,
.reader-toolbar button {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 6px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  cursor: pointer;
}
.reader-toolbar select { padding: 6px 8px; }
.reader-toolbar button:hover {
  background: var(--paper);
  border-color: var(--subtle);
}
.reader-toolbar button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.reader-toolbar .progress {
  color: var(--subtle);
  font-size: 0.85rem;
  min-width: 60px;
  text-align: center;
}
.reader-toolbar .furigana-toggle {
  font-family: var(--font-jp);
  font-weight: 600;
  min-width: 2.5em;
}
.reader-toolbar .furigana-toggle.active {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}
.reader-toolbar .spacer { flex: 1; }

.chapter-content {
  max-width: var(--reader-width);
  margin: 0 auto;
  font-family: var(--font-jp);
  font-size: 1.15rem;
  line-height: 2.0;
  color: var(--fg);
  background: var(--paper);
  padding: 32px 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.chapter-content h1 {
  text-align: center;
  font-family: var(--font-jp);
  font-size: 1.6rem;
  margin: 0 0 24px;
  color: var(--fg);
}
.chapter-content p {
  margin: 0 0 1.4em;
  text-align: justify;
  text-indent: 1em;
}

.chapter-nav {
  max-width: var(--reader-width);
  margin: 16px auto 0;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.chapter-nav button {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 10px 16px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  cursor: pointer;
}
.chapter-nav button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.chapter-nav button:not(:disabled):hover {
  background: var(--bg);
  border-color: var(--subtle);
}

/* ===== Words ===== */
.word {
  display: inline-block;
  cursor: pointer;
  border-bottom: 1px dotted transparent;
  transition: background 0.12s, border-color 0.12s, transform 0.15s ease-out, box-shadow 0.15s;
  padding: 0 1px;
  border-radius: 3px;
  transform-origin: center bottom;
  position: relative;
}
.word:hover {
  border-bottom-color: var(--accent);
  background: var(--bg);
  transform: scale(1.4);
  box-shadow: 0 4px 14px rgba(0,0,0,0.2);
  z-index: 10;
}
.word ruby rt {
  display: none;
  font-size: 0.5em;
  color: var(--subtle);
  font-weight: normal;
  line-height: 1;
}
body.furigana-on .word ruby rt {
  display: revert;
}

/* ===== Word popup ===== */
.popup-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: transparent;
}
.word-popup {
  position: fixed;
  z-index: 1001;
  min-width: 260px;
  max-width: 360px;
  padding: 18px 20px 16px;
  background: var(--paper);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow-strong);
  font-size: 0.95rem;
  line-height: 1.4;
  animation: popup-in 0.14s ease-out;
}
@keyframes popup-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.word-popup-close {
  position: absolute;
  top: 6px;
  right: 8px;
  background: none;
  border: none;
  color: var(--subtle);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  line-height: 1;
}
.word-popup-close:hover {
  background: var(--bg);
  color: var(--fg);
}
.word-popup-surface {
  font-family: var(--font-jp);
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.2;
  margin-bottom: 6px;
  padding-right: 28px;
}
.word-popup-surface ruby rt {
  font-size: 0.45em;
  color: var(--subtle);
  font-weight: normal;
}
.word-popup-reading {
  font-family: var(--font-jp);
  color: var(--subtle);
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.word-popup-meta {
  margin: 10px 0 14px;
  padding: 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 4px 12px;
  font-size: 0.85rem;
}
.word-popup-meta dt {
  color: var(--subtle);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.7rem;
  align-self: center;
}
.word-popup-meta dd { margin: 0; color: var(--fg); }
.word-popup-lemma {
  font-family: var(--font-jp);
  font-size: 1.1rem;
}
.word-popup-actions {
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  display: flex;
  gap: 8px;
}
.word-popup-jisho {
  display: inline-block;
  padding: 6px 12px;
  background: var(--accent);
  color: var(--paper);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
}
.word-popup-jisho:hover {
  background: #8B1F18;
  text-decoration: none;
}

/* ===== Footer ===== */
footer.site-footer {
  border-top: 1px solid var(--border);
  background: var(--paper);
  padding: 32px 24px;
  margin-top: 80px;
  font-size: 0.85rem;
  color: var(--subtle);
}
footer.site-footer .footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
footer.site-footer h3 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
  margin: 0 0 6px;
}
footer.site-footer p { margin: 0 0 8px; line-height: 1.55; }

/* ===== Loading & empty states ===== */
.loading, .empty {
  text-align: center;
  color: var(--subtle);
  font-style: italic;
  padding: 40px 0;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  header.site-header { padding: 12px 16px; }
  header.site-header .tagline { display: none; }
  main { padding: 24px 16px 60px; }
  .book-page-title-ja { font-size: 2.2rem; }
  .chapter-content { padding: 20px 16px; font-size: 1.05rem; line-height: 1.85; }
  footer.site-footer .footer-inner { grid-template-columns: 1fr; }
}