:root {
  --bg: #f7f3ec;
  --paper: #fffdf8;
  --ink: #2a241d;
  --ink-soft: #5a4f43;
  --accent: #8b3a2a;
  --accent-soft: #c97a5a;
  --border: #d8cebc;
  --shadow: 0 1px 2px rgba(40, 32, 24, 0.06), 0 2px 8px rgba(40, 32, 24, 0.04);
  --serif-han: "Noto Serif TC", "Source Han Serif TC", "Songti TC", "STSong", "PMingLiU", serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --mono: ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

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

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif), var(--serif-han);
  line-height: 1.6;
  min-height: 100vh;
  padding-bottom: 64px;
}

header {
  padding: 28px 48px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--paper);
}

h1 {
  font-family: var(--serif-han);
  margin: 0;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.subtitle {
  margin-top: 6px;
  color: var(--ink-soft);
  font-size: 14px;
}

main {
  max-width: 980px;
  margin: 24px auto;
  padding: 0 24px;
  display: grid;
  gap: 20px;
}

section {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 18px 22px;
  box-shadow: var(--shadow);
}

h2 {
  font-family: var(--serif-han);
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: none;
}

/* Examples panel */
.register-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.register-tab {
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 999px;
  cursor: pointer;
  font-family: var(--serif-han);
  font-size: 14px;
  color: var(--ink-soft);
  transition: all 0.15s;
}
.register-tab:hover { border-color: var(--accent-soft); color: var(--accent); }
.register-tab.active {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}

.register-description {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 10px;
  font-style: italic;
}

.example-prompts {
  display: grid;
  gap: 6px;
}

.example-prompt {
  display: block;
  width: 100%;
  text-align: left;
  font-family: var(--serif-han);
  font-size: 15px;
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--ink);
  transition: all 0.15s;
}
.example-prompt:hover {
  border-style: solid;
  border-color: var(--accent-soft);
  background: var(--bg);
}

/* Composer */
.composer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.translate-controls {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
}

textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  font-family: var(--serif-han);
  font-size: 16px;
  line-height: 1.7;
  resize: vertical;
}
textarea:focus { outline: 2px solid var(--accent-soft); outline-offset: -1px; }

.advanced {
  margin-top: 12px;
  font-size: 13px;
}
.advanced summary {
  cursor: pointer;
  color: var(--ink-soft);
  padding: 4px 0;
  user-select: none;
}
.params-grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}
.params-grid label {
  display: flex;
  flex-direction: column;
  font-size: 12px;
  color: var(--ink-soft);
  gap: 2px;
}
.params-grid input {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 13px;
}

.actions {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

button {
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  border-radius: 4px;
  font-size: 14px;
  font-family: var(--serif-han);
  cursor: pointer;
  transition: all 0.15s;
}
button:hover:not(:disabled) { border-color: var(--accent-soft); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.primary {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}
button.primary:hover:not(:disabled) { background: #6e2c1f; border-color: #6e2c1f; }

.status {
  font-size: 13px;
  color: var(--ink-soft);
  font-style: italic;
}
.status.err { color: var(--accent); font-style: normal; }

/* Output */
.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.resolved-prompt {
  font-family: var(--serif-han);
  font-size: 14px;
  color: var(--ink-soft);
  border-left: 3px solid var(--accent-soft);
  padding: 6px 12px;
  margin-bottom: 10px;
  background: var(--bg);
  border-radius: 0 4px 4px 0;
}
.resolved-prompt::before {
  content: "已翻譯為文言文：";
  display: block;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2px;
}
.output-text {
  font-family: var(--serif-han);
  font-size: 18px;
  line-height: 1.9;
  background: var(--bg);
  padding: 16px 20px;
  border-radius: 4px;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 80px;
}

.gloss {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--bg);
  border-left: 3px solid var(--accent-soft);
  border-radius: 0 4px 4px 0;
}
.gloss-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 4px;
}
.gloss-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

footer {
  margin: 32px auto 0;
  max-width: 980px;
  padding: 0 24px;
  font-size: 12px;
  color: var(--ink-soft);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
footer code {
  font-family: var(--mono);
  background: var(--paper);
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

@media (max-width: 640px) {
  header { padding: 20px 20px 12px; }
  main { padding: 0 12px; }
  section { padding: 14px 16px; }
}