:root {
  --bg: #ffffff;
  --bg-card: #f5f5f5;
  --bg-input: #fafafa;
  --border: #e0e0e0;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;
  --accent: #000000;
  --accent-text: #ffffff;
  --tone-track: #d0d0d0;
  --tone-dot: #b0b0b0;
  --tone-dot-active: #333333;
  --tone-label: #999999;
  --tone-label-active: #1a1a1a;
  --result-border: #e0e0e0;
  --copy-border: #cccccc;
  --success: #22c55e;
  --error: #dc2626;
}
[data-theme="dark"] {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --bg-input: #0f0f0f;
  --border: #2a2a2a;
  --text: #e5e5e5;
  --text-secondary: #a0a0a0;
  --text-muted: #525252;
  --accent: #ffffff;
  --accent-text: #000000;
  --tone-track: #3a3a3a;
  --tone-dot: #555555;
  --tone-dot-active: #e5e5e5;
  --tone-label: #525252;
  --tone-label-active: #e5e5e5;
  --result-border: #2a2a2a;
  --copy-border: #333333;
  --success: #4ade80;
  --error: #ef4444;
}
* { margin: 0; padding: 0; box-sizing: border-box; }

/* Keep native controls consistent across desktop and mobile browsers. */
button,
input,
select,
textarea {
  box-sizing: border-box;
  font: inherit;
}

button {
  appearance: none;
  -webkit-appearance: none;
  line-height: 1.2;
  border-radius: 0;
}
body {
  font-family: "Cardo", "Source Serif 4", 
             "Noto Serif HK", "Noto Serif SC", 
             Georgia, serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 24px 16px;
  max-width: 680px;
  margin: 0 auto;
  transition: background 0.2s, color 0.2s;
}
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.top-right {
  display: flex;
  gap: 6px;
  align-items: center;
}
.install-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  font-family: inherit;
}
.install-btn:hover {
  border-color: var(--text-muted);
  color: var(--text);
}
.install-panel {
  margin: -8px 0 24px;
  padding: 14px;
  border: 1px solid var(--border);
  background: var(--bg-card);
}
.install-panel[hidden] {
  display: none;
}
.install-title {
  margin-bottom: 10px;
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
}
.install-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.install-actions .btn,
.install-actions .btn-secondary {
  width: auto;
  padding: 8px 14px;
  text-decoration: none;
  font-family: inherit;
  font-size: 13px;
}
.install-hint {
  margin: 10px 0 0;
  color: var(--text-muted);
  font-size: 12px;
}
.lang-bar {
  display: flex;
  gap: 6px;
}
.lang-bar button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  min-width: 48px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
}
.lang-bar button.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}
.settings-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.15s;
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
}
.settings-btn:hover {
  border-color: var(--text-muted);
  color: var(--text);
}
.theme-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  width: 32px;
  height: 32px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
}
.mode-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
}
.mode-tab {
  flex: 1;
  text-align: center;
  padding: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 15px;
  font-weight: 500;
  transition: all 0.15s;
  font-family: inherit;
}
.mode-tab.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}
.section { display: none; }
.section.active { display: block; }
.label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  font-weight: 600;
}
.sublabel {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

/* ===== Settings Panel ===== */
.settings-panel {
  margin-bottom: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 16px;
}
.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.settings-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.settings-close {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  padding: 0 4px;
  font-family: inherit;
}
.settings-close:hover {
  color: var(--text);
}
.settings-row {
  margin-bottom: 16px;
}
.settings-row .sublabel {
  display: block;
  margin-bottom: 8px;
}
.key-input-wrap {
  display: flex;
  gap: 8px;
}
.key-input-wrap .input-text {
  flex: 1;
  margin-bottom: 0;
  min-height: 40px;
  padding: 8px 10px;
  font-size: 14px;
}
.settings-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
  margin-bottom: 16px;
}
.settings-actions {
  display: flex;
  gap: 8px;
}
.settings-actions .btn {
  width: auto;
  padding: 8px 20px;
  font-size: 13px;
}
.settings-actions .btn-secondary {
  padding: 4px 14px;
  font-size: 13px;
}

/* ===== Modal ===== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}
.modal.show {
  display: flex;
}
.modal-box {
  background: var(--bg);
  padding: 24px;
  min-width: 280px;
  max-width: 420px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  border: 1px solid var(--border);
}
.modal-box p {
  margin: 0 0 20px 0;
  font-size: 15px;
  color: var(--text);
  line-height: 1.5;
  white-space: pre-line;
}
.modal-btns {
  display: flex;
  justify-content: center;
}
.modal-btns button {
  padding: 8px 28px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  transition: opacity 0.15s;
  font-family: inherit;
  line-height: 1.2;
}
.modal-btns button:hover {
  opacity: 0.85;
}

/* Tone Slider */
.tone-wrap { margin-bottom: 24px; }
.tone-slider {
  position: relative;
  height: 60px;
  margin: 10px 0;
  user-select: none;
  touch-action: none;
  cursor: pointer;
}
.tone-track {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  transform: translateY(-50%);
  background: var(--tone-track);
}
.tone-dots {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
}
.tone-item {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tone-item[data-tone="casual2"] { left: 0%; }
.tone-item[data-tone="casual1"] { left: 25%; }
.tone-item[data-tone="natural"]  { left: 50%; }
.tone-item[data-tone="formal1"] { left: 75%; }
.tone-item[data-tone="formal2"] { left: 100%; }

.tone-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--tone-dot);
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  transition: all 0.2s ease;
}
.tone-item.active .tone-dot {
  background: var(--tone-dot-active);
  transform: scale(1.2);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 4px var(--tone-dot-active);
}
.tone-label {
  position: absolute;
  font-size: 10px;
  color: var(--tone-label);
  white-space: nowrap;
  transition: color 0.2s ease;
  font-weight: 500;
  left: 50%;
  transform: translateX(-50%);
}
.tone-item:not(.label-below) .tone-label {
  bottom: calc(100% + 10px);
}
.tone-item.label-below .tone-label {
  top: calc(100% + 10px);
}
.tone-item:first-child .tone-label,
.tone-item:last-child .tone-label {
  transform: none;
}
.tone-item:first-child .tone-label {
  left: 0;
}
.tone-item:last-child .tone-label {
  left: auto;
  right: 0;
}
.tone-item.active .tone-label {
  color: var(--tone-label-active);
  font-weight: 600;
}

textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  line-height: 1.5;
  transition: border-color 0.15s;
}
textarea:focus { border-color: var(--text-muted); }
textarea::placeholder { color: var(--text-muted); }
.box-small { min-height: 80px; margin-bottom: 4px; }
.box-large { min-height: 160px; margin-bottom: 4px; }
.btn {
  width: 100%;
  min-height: 42px;
  padding: 14px;
  background: var(--accent);
  color: var(--accent-text);
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
  font-family: inherit;
  line-height: 1.2;
}
.btn:hover { opacity: 0.85; }
.btn:active { transform: scale(0.998); }
.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 4px 10px;
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  line-height: 1.2;
  white-space: nowrap;
}
.btn-secondary:hover {
  border-color: var(--text-muted);
  color: var(--text);
}
.input-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.grammar-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.btn-grammar-only {
  padding: 4px 12px;
  font-size: 11px;
  white-space: nowrap;
}

/* X vibe button */
.x-vibe-btn {
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s;
  line-height: 1;
}
.x-vibe-btn:hover {
  color: var(--text-secondary);
}
.x-vibe-btn.active {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}
.x-vibe-btn.active:hover {
  opacity: 0.8;
}

.loading {
  display: none;
  text-align: center;
  padding: 16px;
}
.loading.show { display: block; }
.spinner-wrap {
  display: none;
  justify-content: center;
  align-items: center;
  padding: 8px;
}
.spinner-wrap.show { display: flex; }
.spinner-wrap img {
  width: 100px;
  height: auto;
}
[data-theme="dark"] .spinner-wrap img {
  filter: invert(1);
}
.loading-text {
  display: block;
  color: var(--text-secondary);
  font-size: 13px;
  min-height: 22px;
}
.result-box {
  display: none;
  margin-top: 24px;
  background: var(--bg-card);
  border: 1px solid var(--result-border);
  padding: 16px;
}
.result-box.show { display: block; }
.result-box.guide-mode { background: transparent; border: 0; padding: 0; }
.result-box.guide-mode > .result-header { display: none; }
.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--result-border);
}
.result-title {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.result-actions {
  display: flex;
  gap: 8px;
}
.copy-btn {
  background: transparent;
  border: 1px solid var(--copy-border);
  color: var(--text-secondary);
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}
.copy-btn:hover { border-color: var(--text-muted); color: var(--text); }
.retry-feedback {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--result-border);
}
.retry-input {
  width: 100%;
  min-height: 60px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  resize: vertical;
  outline: none;
  line-height: 1.5;
  transition: border-color 0.15s;
  margin-bottom: 8px;
}
.retry-input:focus { border-color: var(--text-muted); }
.retry-input::placeholder { color: var(--text-muted); }
.retry-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
}
.retry-actions .btn {
  width: auto;
  padding: 8px 16px;
  font-size: 13px;
}

.result-body {
  white-space: pre-wrap;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}
.result-body strong { color: var(--text); font-weight: 700; }
.result-body ul { margin: 8px 0; padding-left: 20px; }
.result-body li { margin: 4px 0; }
.grammar-section {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--result-border);
}
.grammar-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}
.grammar-section-title {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  margin-bottom: 6px;
}
.grammar-corrected {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
  padding: 8px 0;
}
.grammar-issues {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}
.no-issues {
  color: var(--success);
  font-weight: 600;
}

/* History nav */
.history-nav {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--result-border);
}
.history-nav.show { display: flex; }
.history-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 14px;
  padding: 0;
  transition: all 0.15s;
  font-family: inherit;
}
.history-btn:hover {
  border-color: var(--text-muted);
  color: var(--text);
}
.history-page {
  font-size: 13px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-width: 40px;
  text-align: center;
}

.footer-section {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.accordion-item { margin-bottom: 12px; }
.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 8px 0;
}
.accordion-header:hover .sublabel { color: var(--text); }
.accordion-toggle {
  font-size: 11px;
  color: var(--text-muted);
  background: none;
  border: 1px solid var(--border);
  padding: 2px 8px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  display: inline-block;
  pointer-events: none;
  font-family: inherit;
}
.accordion-toggle:hover {
  border-color: var(--text-muted);
  color: var(--text);
}
.accordion-content {
  display: none;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-bottom: 8px;
}
.accordion-content.show { display: block; }
.footer-text a {
  color: var(--text-secondary);
  text-decoration: underline;
}
.footer-text a:hover { color: var(--text); }

/* Target language input */
.input-text {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  line-height: 1.5;
  transition: border-color 0.15s;
  margin-bottom: 16px;
}
.input-text:focus { border-color: var(--text-muted); }
.input-text::placeholder { color: var(--text-muted); }

/* Tone collapsed state */
.tone-collapsed {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.tone-collapsed .sublabel {
  margin-bottom: 0;
}
.tone-toggle-link {
  font-size: 14px;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  user-select: none;
}
.tone-toggle-link:hover {
  opacity: 0.7;
}

/* Tone expanded state */
.tone-expanded {
  margin-bottom: 16px;
}
.tone-collapse-link {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  user-select: none;
  margin-top: 8px;
  text-align: right;
}
.tone-collapse-link:hover {
  color: var(--text-secondary);
}

/* More collapsed state */
.more-collapsed {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.more-collapsed .sublabel {
  margin-bottom: 0;
  color: var(--text-muted);
}
.more-toggle-link {
  font-size: 14px;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  user-select: none;
}
.more-toggle-link:hover {
  opacity: 0.7;
}

/* More expanded state */
.more-expanded {
  margin-bottom: 16px;
}
.more-collapse-link {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  user-select: none;
  margin-top: 8px;
  text-align: right;
}
.more-collapse-link:hover {
  color: var(--text-secondary);
}

/* Terminology collapsed */
.term-collapsed {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.term-collapsed .sublabel {
  margin-bottom: 0;
  color: var(--text-muted);
}
.term-toggle-link {
  font-size: 14px;
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  user-select: none;
}
.term-toggle-link:hover {
  opacity: 0.7;
}

/* Terminology expanded */
.term-expanded {
  margin-bottom: 16px;
}
.term-input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.term-input {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  font-size: 14px;
  outline: none;
  font-family: inherit;
}
.term-input:focus {
  border-color: var(--text);
}

.term-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}
.term-empty {
  font-size: 13px;
  color: var(--text-muted);
  padding: 8px 0;
}
.term-item {
  border: 1px solid var(--border);
  padding: 10px 12px;
  background: var(--bg-card);
}
.term-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.term-text {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  min-width: 80px;
}
.term-modes {
  display: flex;
  gap: 0;
  flex: 1;
}
.term-mode {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg);
  user-select: none;
  font-family: inherit;
}
.term-mode:first-child {
  border-right: none;
}
.term-mode.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.term-mode input[type="radio"] {
  display: none;
}
.term-delete {
  margin-left: auto;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 0;
  font-family: inherit;
}
.term-delete:hover {
  border-color: var(--text);
  color: var(--text);
}
.term-translation {
  width: 100%;
  margin-top: 8px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  font-size: 13px;
  outline: none;
  font-family: inherit;
}
.term-translation:focus {
  border-color: var(--text);
}
.term-actions {
  display: flex;
  gap: 8px;
}
.term-collapse-link {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
  cursor: pointer;
  user-select: none;
  margin-top: 8px;
  text-align: right;
}
.term-collapse-link:hover {
  color: var(--text-secondary);
}

/* Dark mode */
[data-theme="dark"] .term-item {
  background: var(--bg-card);
}
[data-theme="dark"] .term-mode {
  background: var(--bg);
}
[data-theme="dark"] .term-mode.active {
  background: var(--text);
  color: var(--bg);
}
[data-theme="dark"] .modal-box {
  background: var(--bg);
  border-color: var(--border);
}

.tutorial-btn,
.request-settings-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 42px;
  padding: 0;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.tutorial-btn { width: 32px; min-height: 32px; font-size: 16px; }
.request-settings-btn { width: 42px; font-size: 19px; }
.tutorial-btn:hover,
.request-settings-btn:hover,
.tutorial-btn:focus-visible,
.request-settings-btn:focus-visible {
  color: var(--text);
  border-color: var(--text-muted);
  background: var(--bg-card);
}
.primary-actions {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 8px;
  align-items: stretch;
  margin-top: 8px;
}
.primary-actions .btn {
  width: 100%;
  min-width: 0;
}
.prompt-tools .btn-secondary,
.grammar-actions .btn-secondary,
.term-actions .btn-secondary,
.input-actions .btn-secondary,
.history-tools .btn-secondary,
.options-heading .settings-close,
.request-options .btn,
.history-undo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  visibility: visible;
  opacity: 1;
}
.prompt-tools .btn-secondary,
.grammar-actions .btn-secondary,
.term-actions .btn-secondary,
.input-actions .btn-secondary,
.history-tools .btn-secondary {
  min-height: 30px;
  white-space: nowrap;
}
.tone-expanded,
.more-expanded,
.term-expanded {
  border: 1px solid var(--border);
  background: transparent;
  padding: 14px;
}
.prompt-tools { display: flex; align-items: center; gap: 8px; margin: 4px 0 10px; }
.prompt-list,
.model-choice,
.request-options select,
.history-version {
  min-height: 34px;
  padding: 6px 8px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  font: inherit;
  font-size: 12px;
}
.prompt-list { flex: 1; min-width: 0; }
.request-options {
  position: fixed;
  z-index: 900;
  top: 12vh;
  left: 50%;
  transform: translateX(-50%);
  width: min(360px, calc(100vw - 24px));
  max-height: min(520px, calc(100vh - 24px));
  overflow-y: auto;
  padding: 16px;
  border: 1px solid var(--border);
  background: var(--bg);
  box-shadow: 0 8px 32px rgba(0,0,0,.2);
}
.request-options[hidden] { display: none; }
.options-heading { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.request-options > label,
.request-model-row label { display: flex; flex-direction: column; gap: 5px; margin: 10px 0; color: var(--text-secondary); font-size: 12px; }
.request-options select { width: 100%; }
.request-model-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.request-model-row label[hidden] { display: none; }
.request-options .option-check { flex-direction: row; align-items: center; }
.request-options .option-check input { accent-color: var(--text); }
.request-options .btn { margin-top: 8px; padding: 10px; }
.history-header { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: 8px; }
.history-tools { display: flex; align-items: center; justify-self: end; gap: 8px; }
.history-version { min-width: 58px; }
.history-controls { margin-top: 0; border: 0; padding-top: 0; }
.history-list { display: flex; flex-direction: column; gap: 5px; margin-top: 8px; }
.history-row { display: flex; gap: 6px; align-items: stretch; }
.history-select { flex: 1; min-width: 0; overflow: hidden; text-align: left; text-overflow: ellipsis; white-space: nowrap; border: 1px solid var(--border); background: transparent; color: var(--text-secondary); padding: 6px 8px; font: inherit; font-size: 12px; cursor: pointer; }
.history-row.active .history-select { border-color: var(--text-muted); color: var(--text); }
.history-delete { width: 32px; border: 0; background: transparent; color: var(--text-secondary); font: inherit; cursor: pointer; }
.history-delete:hover,
.history-delete:focus,
.history-delete:focus-visible { border: 0; }
.history-undo { display: flex; align-items: center; justify-content: center; gap: 0; margin: 0; padding: 0; color: var(--text-secondary); }
.history-undo[hidden] { display: none; }
.history-undo-btn { display: grid; place-items: center; width: 32px; height: 32px; padding: 0; border: 0; background: transparent; color: var(--text-secondary); font: inherit; font-size: 20px; line-height: 1; cursor: pointer; }
.history-undo-btn:hover,
.history-undo-btn:focus { border: 0; color: var(--text); }
.history-undo-btn:focus-visible { outline: 2px solid var(--text-muted); outline-offset: 2px; }
.result-card { border: 1px solid var(--result-border); background: var(--bg); padding: 12px; margin-bottom: 12px; }
.result-card:last-child { margin-bottom: 0; }
.card-header { display: flex; justify-content: space-between; align-items: center; gap: 8px; border-bottom: 1px solid var(--result-border); padding-bottom: 8px; margin-bottom: 8px; font-size: 12px; }
.card-actions { display: flex; gap: 6px; }
.card-result { min-height: 24px; }
.card-feedback { margin: 8px 0; }
.card-error { color: var(--error); font-size: 12px; }
.tutorial-box { max-width: 560px; width: calc(100vw - 32px); max-height: 80vh; overflow-y: auto; text-align: left; }
.tutorial-box .modal-btns { margin-top: 18px; }
.tutorial-content { color: var(--text-secondary); font-size: 14px; line-height: 1.8; }
.tutorial-content strong { color: var(--text); }
.guide-request + .guide-request { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--border); }
.guide-frame { position: relative; border: 1px solid var(--text); background: transparent; padding: 0 10px 10px; margin-bottom: 12px; }
.guide-frame-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; margin: 0 -10px 4px; }
.guide-label { display: inline-flex; align-items: center; min-height: 24px; padding: 2px 8px; border: 1px solid var(--text); border-top: 0; color: var(--text); font-size: 11px; line-height: 1.2; }
.guide-external-actions { display: flex; gap: 8px; padding: 4px 0 0 8px; }
.guide-turn { white-space: pre-wrap; line-height: 1.6; padding: 4px 0; }
.guide-assistant { color: var(--text); }
.guide-user-box { margin: -4px 0 12px; padding: 10px; border: 1px solid var(--border); background: var(--bg-card); color: var(--text-secondary); white-space: pre-wrap; line-height: 1.6; }
.guide-continue-button { display: block; margin: 8px 0 0 auto; padding: 7px 16px; border: 0; background: var(--accent); color: var(--accent-text); font: inherit; font-size: 12px; cursor: pointer; }
.guide-continue-button:disabled { opacity: .45; cursor: not-allowed; }
.guide-continue { margin: 8px -10px -10px; padding: 8px 10px; background: var(--bg-card); border-top: 1px solid var(--border); }
.guide-input { width: 100%; min-height: 60px; margin-bottom: 8px; background: var(--bg); }
.guide-send { display: block; margin-left: auto; padding: 7px 16px; border: 0; background: var(--accent); color: var(--accent-text); font: inherit; font-size: 12px; cursor: pointer; }
.guide-send:disabled { opacity: .45; cursor: not-allowed; }
@media (max-width: 440px) {
  body { padding: 16px 12px; }
  .request-model-row { grid-template-columns: 1fr; gap: 0; }
  .card-header { align-items: flex-start; flex-direction: column; }
  .history-tools { gap: 4px; }
  .history-tools .btn-secondary { padding: 4px 7px; }
}
.options-count-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; color: var(--text-secondary); font-size: 12px; margin-bottom: 12px; }
.options-count-controls { display: flex; align-items: center; gap: 8px; }
.options-help { width: 24px; height: 24px; border: 0; background: transparent; color: var(--text-muted); cursor: pointer; font: inherit; font-size: 14px; line-height: 1; }
.options-help:hover,
.options-help:focus-visible { color: var(--text); }
.segmented { display: inline-flex; border: 1px solid var(--border); }
.segmented button { border: 0; border-right: 1px solid var(--border); background: transparent; color: var(--text-secondary); padding: 6px 10px; min-width: 42px; cursor: pointer; font: inherit; font-size: 12px; line-height: 1.2; }
.segmented button:last-child { border-right: 0; }
.segmented button.active { background: var(--text); color: var(--bg); }
.segmented.disabled { opacity: .45; pointer-events: none; }
.request-block { border-top: 1px solid var(--border); padding: 10px 0 4px; }
.request-block-title { color: var(--text); font-size: 12px; font-weight: 600; margin-bottom: 6px; }
.request-block label { display: flex; flex-direction: column; gap: 5px; margin: 8px 0; color: var(--text-secondary); font-size: 12px; }
.request-block .option-label { color: var(--text-secondary); font-size: 12px; margin-top: 8px; }
.request-block .option-check { flex-direction: row; align-items: center; gap: 7px; }
.request-block .option-check input { accent-color: var(--text); }
.request-block .model-choice { width: 100%; }
.request-options { max-height: min(520px, calc(100vh - 24px)); overflow-y: auto; }