/* musubi WebUI — minimal, monospace-friendly, with a single red-thread accent. */

:root {
  --bg: #fafaf7;
  --fg: #1a1a1a;
  --accent: #b22222;
  --muted: #6b6b6b;
  --border: #d8d8d3;
  --code-bg: #f0f0eb;
  --warning-bg: #fff8e1;
  --success: #2e7d32;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Menlo", "Consolas", monospace;
  --serif: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", "Times New Roman", serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--serif);
  background: var(--bg);
  color: var(--fg);
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  line-height: 1.7;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}
header h1 {
  font-size: 2.5rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  margin: 0;
}
header h1 .kanji {
  color: var(--accent);
  margin-left: 0.4em;
}
.tagline {
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
  margin: 0.4rem 0 0;
}

.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.tabs button {
  background: none;
  border: none;
  padding: 0.7rem 1.2rem;
  font: inherit;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.2s;
}
.tabs button:hover { color: var(--fg); }
.tabs button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.panel { display: none; }
.panel.active { display: block; }
.panel h2 {
  font-weight: 400;
  font-size: 1.4rem;
  margin: 0 0 0.5rem;
}
.panel .lede {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 1.2rem;
}
.panel .lede code {
  background: var(--code-bg);
  padding: 0 0.3em;
  border-radius: 3px;
  font-size: 0.85em;
}

label {
  display: block;
  margin: 1rem 0 0.4rem;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
label.inline {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

textarea, input[type="number"] {
  width: 100%;
  padding: 0.7rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--code-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  resize: vertical;
  line-height: 1.5;
}
textarea:focus, input:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
}
input[type="number"] { width: 8em; padding: 0.4rem 0.6rem; }
textarea[readonly] { background: #f6f6f1; }

button {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}
button:hover { background: var(--fg); color: var(--bg); }
button.primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
  margin-top: 1rem;
  padding: 0.6rem 1.6rem;
  font-size: 0.95rem;
}
button.primary:hover { background: var(--accent); border-color: var(--accent); }

.actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

details.weaving {
  margin: 1.2rem 0 0.4rem;
  padding: 0.8rem 1rem;
  border: 1px dashed var(--border);
  border-radius: 4px;
  background: #fdfdfa;
}
details.weaving > summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
}
details.weaving[open] > summary {
  margin-bottom: 0.6rem;
}
details.weaving .lede {
  margin: 0 0 0.6rem;
  font-size: 0.85rem;
}

#status {
  position: fixed;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--fg);
  color: var(--bg);
  padding: 0.6rem 1.2rem;
  border-radius: 4px;
  font-size: 0.9rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  max-width: calc(100% - 2rem);
}
#status.error { background: var(--accent); }
#status.success { background: var(--success); }

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}
.warning {
  background: var(--warning-bg);
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  margin: 0 0 1rem;
}
.warning strong {
  color: var(--accent);
  display: block;
  margin-bottom: 0.2rem;
}
.attribution {
  text-align: center;
  margin: 1rem 0 0;
}
a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dotted var(--accent);
}
a:hover { border-bottom-style: solid; }

@media (max-width: 480px) {
  body { padding: 1.5rem 1rem 3rem; }
  header h1 { font-size: 2rem; }
  .tabs button { padding: 0.5rem 0.8rem; font-size: 0.85rem; }
}