/* ─── Variables ─────────────────────────────────────────────────── */
:root {
  --bg: #f6f6ef;
  --panel: #fffdf7;
  --panel-2: #f1eee1;
  --text: #212121;
  --muted: #666150;
  --line: #ddd5bf;
  --accent: #8b6c2c;
  --accent-border: #7a5e25;
  --accent-2: #3f6c5f;
  --white: #fff;
  --bg-warm: #fff8d8;
  --bg-cool: #e7f2ef;
  --shadow-hard: rgba(0, 0, 0, 0.78);
  --shadow-soft: rgba(0, 0, 0, 0.15);
  --panel-frosted: rgba(255, 253, 247, 0.8);
  --white-border-soft: rgba(255, 255, 255, 0.25);

  --radius: 10px;
  --radius-lg: 14px;
  --sidebar-w: 290px;
}

/* ─── Reset base ────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 10%, var(--bg-warm) 0, transparent 35%),
    radial-gradient(circle at 90% 80%, var(--bg-cool) 0, transparent 35%),
    var(--bg);
}

h1 {
  font-size: 2em;
  margin: 0.67em 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  text-align: center;
}

h1::before,
h1::after {
  content: "";
  flex: 1 1 120px;
  max-width: 240px;
  height: 1px;
  background: var(--line);
}

ul { margin: 0; padding-left: 1rem; }
li { margin-bottom: 0.3rem; }

/* ─── Utilities ─────────────────────────────────────────────────── */
.hidden { display: none; }
.muted  { color: var(--muted); font-size: 0.9rem; }

/* ─── Shared button base ────────────────────────────────────────── */
.btn {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.55rem 0.8rem;
  background: var(--panel-2);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover { background: var(--panel); }

.btn-pill   { border-radius: 999px; }
.btn-ghost  { border: 0; background: transparent; padding: 0.2rem 0; font-weight: 400; color: inherit; text-decoration: none; cursor: pointer; }
.btn-active { background: var(--accent); border-color: var(--accent-border); color: var(--white); }
.btn-active:hover { color: var(--text); }
.btn-muted  { color: var(--muted); cursor: not-allowed; }
.btn-ghost:hover { color: var(--accent-2); }

/* ─── Shared panel ──────────────────────────────────────────────── */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1rem;
}

.panel h3 { margin-top: 0; }

/* ─── Layout shell ──────────────────────────────────────────────── */
.app-shell { min-height: 100vh; }

.topbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel-frosted);
  backdrop-filter: blur(4px);
}

.topbar h1      { margin: 0; font-size: 1.4rem; }
.topbar h1 {
  display: block;
  text-align: left;
}

.topbar h1::before,
.topbar h1::after {
  content: none;
}

.topbar .subtitle { margin: 0.1rem 0 0; color: var(--muted); font-size: 0.9rem; }

.site-nav {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: calc(100vh - 80px);
}

.sidebar.hidden + main { grid-column: 1 / -1; }

/* ─── Sidebar ───────────────────────────────────────────────────── */
.sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 1rem;
  overflow-y: auto;
  display: grid;
  gap: 1.25rem;
}

.sidebar.hidden { display: none; }

.menu-section { margin: 0; }

.menu-section h2,
.menu-section h3,
.menu-section h4 { margin: 0 0 0.6rem; }

.menu-section h4 { color: var(--muted); font-size: 0.9rem; }

/* ─── Content area ──────────────────────────────────────────────── */
.content { padding: 1.2rem; }

.content-header h2 { margin: 0; }
.content-header p  { margin: 0.3rem 0 1rem; color: var(--muted); }

.lore-content { line-height: 1.5; }
.lore-content img { max-width: 100%; }
img {
  display: block;
  margin-inline: auto;
}

.koten-word img,
#word-image {
  margin-inline: 0;
}

.koten-word img {
  display: inline-block;
}

.lore-content a {
  color: var(--accent-2);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.lore-content a:hover,
.lore-content a:focus-visible {
  color: var(--accent);
}

/* Global inline word-image style from backend-generated HTML */
.koten-word {
  display: inline-block;
  vertical-align: middle;
  margin: 0 2px;
  position: relative;
  cursor: help;
}

.koten-word img {
  max-height: 1.5em;
  width: auto;
}

.koten-word::after {
  content: attr(data-word);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  font-size: 0.8rem;
  line-height: 1.4;
  white-space: nowrap;
  box-shadow: 0 2px 8px var(--shadow-soft);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  z-index: 10;
}

.koten-word:hover::after,
.koten-word:focus-within::after {
  opacity: 1;
}

/* Global image modal */
.image-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--shadow-hard);
  cursor: zoom-out;
  padding: 1rem;
}

.image-modal-content {
  max-width: 92vw;
  max-height: 92vh;
  display: grid;
  gap: 0.5rem;
  justify-items: center;
  background: var(--bg-warm);
  border-radius: var(--radius);
  padding: 0.75rem;
}

.image-modal-content img {
  max-width: 100%;
  max-height: calc(92vh - 2.2rem);
  border-radius: var(--radius);
  border: 1px solid var(--white-border-soft);
  background: var(--bg-warm);
}

.image-modal-caption {
  color: var(--text);
  font-size: 0.9rem;
  text-align: center;
  word-break: break-word;
}

/* ─── Lexicon tool ──────────────────────────────────────────────── */
.tool-form {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: end;
  margin-bottom: 1rem;
}

.tool-form label { display: grid; gap: 0.3rem; font-size: 0.9rem; color: var(--muted); }

.tool-form input,
.tool-form select {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem;
  font: inherit;
  color: var(--text);
  background: var(--white);
}

.results {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1rem;
}

#word-image {
  display: block;
  width: 100%;
  max-height: 260px;
  min-height: 100px;
  object-fit: contain;
  cursor: pointer;
  background: var(--white);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.analysis-output.empty { color: var(--muted); }

.root-item {
  border-top: 1px dashed var(--line);
  padding-top: 0.6rem;
  margin-top: 0.6rem;
}

/* ─── Tools view ─────────────────────────────────────────────────── */
#tools-view .panel + .panel { margin-top: 1rem; }

#tools-image {
  display: block;
  width: 100%;
  max-height: 260px;
  min-height: 100px;
  object-fit: contain;
  background: var(--white);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  margin-top: 0.75rem;
}

.tool-stack { display: grid; gap: 0.8rem; }

.tool-stack textarea {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem;
  font: inherit;
  color: var(--text);
  background: var(--white);
  resize: vertical;
  width: 100%;
}

.tool-stack .btn { justify-self: start; }

/* ─── Tables ────────────────────────────────────────────────────── */
table {
  border-collapse: collapse;
  margin-inline: auto;
  margin-bottom: 1rem;
}

th,
td {
  padding: 0.45rem 0.8rem;
  border: 1px solid var(--line);
  text-align: center;
  vertical-align: middle;
}

th {
  background: var(--white);
  box-shadow: 0 2px 4px var(--shadow-hard);
  font-weight: 600;
}

/* ─── Responsive ────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .topbar { align-items: flex-start; }

  .site-nav { width: 100%; margin-left: 0; }
  .site-nav .btn { flex: 1 1 calc(33.33% - 0.45rem); text-align: center; }

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

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .tool-form,
  .results { grid-template-columns: 1fr; }
}