/* ===== CSS Variables & Themes ===== */
:root {
  --accent: #8b7ec8;
  --accent-light: #b8aee6;
  --accent-bg: #f0edf8;
  --bg: #ffffff;
  --bg-secondary: #f7f7fa;
  --text: #2c2c2c;
  --text-secondary: #6b6b7b;
  --border: #e0dfe6;
  --header-bg: #ffffff;
  --editor-bg: #ffffff;
  --modal-bg: #ffffff;
  --shadow: rgba(139, 126, 200, 0.08);
  --shadow-strong: rgba(139, 126, 200, 0.16);
}

[data-theme="dark"] {
  --bg: #1a1a2e;
  --bg-secondary: #22223a;
  --text: #e0dfe6;
  --text-secondary: #9a99a8;
  --border: #3a3a52;
  --header-bg: #22223a;
  --editor-bg: #1e1e32;
  --modal-bg: #26264a;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-strong: rgba(0, 0, 0, 0.5);
}

[data-theme="sepia"] {
  --bg: #f4ecd8;
  --bg-secondary: #efe6cf;
  --text: #4a3f2f;
  --text-secondary: #7a6f5f;
  --border: #d4c9b0;
  --header-bg: #f4ecd8;
  --editor-bg: #faf5e8;
  --modal-bg: #f4ecd8;
  --shadow: rgba(74, 63, 47, 0.08);
  --shadow-strong: rgba(74, 63, 47, 0.16);
}

[data-theme="blue"] {
  --bg: #e8f0fe;
  --bg-secondary: #dce7f8;
  --text: #1a2a3a;
  --text-secondary: #5a6a7a;
  --border: #bcd0e8;
  --header-bg: #e8f0fe;
  --editor-bg: #f0f5ff;
  --modal-bg: #e8f0fe;
  --shadow: rgba(26, 42, 58, 0.08);
  --shadow-strong: rgba(26, 42, 58, 0.16);
}

[data-theme="green"] {
  --bg: #e8f5e9;
  --bg-secondary: #dceeddc0;
  --text: #1b3a1e;
  --text-secondary: #5a7a5e;
  --border: #b8d8ba;
  --header-bg: #e8f5e9;
  --editor-bg: #f0faf0;
  --modal-bg: #e8f5e9;
  --shadow: rgba(27, 58, 30, 0.08);
  --shadow-strong: rgba(27, 58, 30, 0.16);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@400;700&family=Noto+Sans+JP:wght@400;700&display=swap');

html {
  font-size: 16px;
  height: 100%;
}

body {
  font-family: 'Noto Serif JP', serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background 0.3s, color 0.3s;
}

/* ===== Header ===== */
#app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 4px var(--shadow);
  z-index: 10;
  flex-shrink: 0;
  transition: background 0.3s, border-color 0.3s;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.app-title-link {
  text-decoration: none;
}

.app-title-link:hover .app-title {
  opacity: 0.8;
}

.app-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.char-count {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 2px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.header-auth {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  margin-right: 12px;
}

.btn-auth-login {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn-auth-login:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-info[hidden] {
  display: none !important;
}

.user-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.user-avatar[src=""],
.user-avatar:not([src]) {
  display: none;
}

.user-name {
  font-size: 12px;
  color: var(--text);
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-auth-sm {
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-auth-sm:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

.toolbar-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
  box-shadow: 0 2px 8px var(--shadow);
}

.btn-icon {
  font-size: 14px;
}

/* ===== Feedback Button ===== */
.feedback-btn {
  background: var(--accent-bg) !important;
  color: var(--accent) !important;
  border: 1px solid var(--accent-light) !important;
  font-weight: 600;
  text-decoration: none;
}

.feedback-btn:hover {
  background: var(--accent-light) !important;
  color: #fff !important;
  border-color: var(--accent-light) !important;
  box-shadow: 0 2px 8px var(--shadow) !important;
}

.feedback-link {
  color: var(--accent) !important;
  font-weight: 600;
}

/* ===== Editor Area ===== */
#editor-area {
  flex: 1;
  display: flex;
  overflow: hidden;
  background: var(--bg);
  transition: background 0.3s;
}

#editor-wrapper {
  flex: 1;
  padding: 24px;
  overflow-x: auto;
  overflow-y: hidden;
}

#novel-editor {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  width: 100%;
  height: 100%;
  border: none;
  outline: none;
  resize: none;
  background: var(--editor-bg);
  color: var(--text);
  font-family: 'Noto Serif JP', serif;
  font-size: 16px;
  line-height: 1.8;
  padding: 20px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: background 0.3s, color 0.3s, border-color 0.3s;
  overflow: auto;
  caret-color: var(--accent);
}

#novel-editor::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

#novel-editor:focus {
  border-color: var(--accent-light);
  box-shadow: 0 0 0 2px var(--accent-bg);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(2px);
  animation: fadeIn 0.15s ease;
}

.modal-overlay[hidden] {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--modal-bg);
  border-radius: 12px;
  box-shadow: 0 8px 32px var(--shadow-strong);
  width: 90%;
  max-width: 480px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.2s ease;
  border: 1px solid var(--border);
}

.modal-wide {
  max-width: 680px;
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
}

.modal-close {
  width: 28px;
  height: 28px;
  border: none;
  background: var(--bg-secondary);
  border-radius: 50%;
  font-size: 18px;
  line-height: 1;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.modal-close:hover {
  background: var(--accent);
  color: #fff;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.modal-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

/* ===== Buttons ===== */
.btn {
  padding: 8px 20px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 2px 8px var(--shadow);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-accent {
  background: linear-gradient(135deg, #d4a574, #c4956a);
  color: #fff;
  border: none;
  font-weight: 600;
}

.btn-accent:hover {
  filter: brightness(1.1);
  box-shadow: 0 2px 8px var(--shadow);
}

.btn-accent:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  filter: none;
}

/* ===== Format Options ===== */
.format-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.format-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
  font-size: 13px;
}

.format-option:hover {
  background: var(--accent-bg);
}

.format-option input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

/* ===== Format Diff Preview ===== */
.format-diff-view {
  font-family: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
  font-size: 13px;
  line-height: 1.8;
  max-height: 50vh;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
}

.diff-line {
  padding: 2px 12px;
  white-space: pre-wrap;
  word-break: break-all;
}

.diff-line-removed {
  background: #fdd;
  color: #a00;
}

.diff-line-added {
  background: #dfd;
  color: #070;
}

[data-theme="dark"] .diff-line-removed {
  background: #3d1f1f;
  color: #f88;
}

[data-theme="dark"] .diff-line-added {
  background: #1f3d1f;
  color: #8f8;
}

.diff-line-context {
  color: var(--text-secondary);
}

.diff-separator {
  padding: 4px 12px;
  color: var(--text-secondary);
  font-size: 11px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ===== Format History ===== */
.format-history-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.format-history-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.format-history-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.format-history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  background: var(--bg);
}

.format-history-item:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.format-history-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.format-history-item-date {
  color: var(--text-secondary);
  font-size: 11px;
}

.format-history-item-chars {
  color: var(--text);
  font-size: 12px;
}

.format-history-restore {
  padding: 4px 10px;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.format-history-restore:hover {
  filter: brightness(1.1);
}

/* ===== Split Results ===== */
.split-settings {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 13px;
}

.split-settings input[type="number"] {
  width: 80px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
}

.split-results {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.split-part {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.split-part-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-secondary);
}

.split-part-header strong {
  color: var(--accent);
}

.split-part-body {
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.7;
  max-height: 200px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.split-copy-btn {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

.split-copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.split-copy-btn.copied {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== Help ===== */
.help-body {
  display: flex;
  gap: 0;
  padding: 0 !important;
}

.help-nav {
  display: flex;
  flex-direction: column;
  min-width: 120px;
  border-right: 1px solid var(--border);
  padding: 12px 0;
  background: var(--bg-secondary);
}

.help-tab {
  padding: 10px 16px;
  border: none;
  background: none;
  text-align: left;
  font-size: 12px;
  font-family: inherit;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}

.help-tab:hover {
  color: var(--accent);
  background: var(--accent-bg);
}

.help-tab.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-bg);
  font-weight: 700;
}

.help-content {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.help-panel {
  display: none;
}

.help-panel.active {
  display: block;
}

.help-panel h3 {
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 16px;
}

.help-panel dl {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.help-panel dt {
  font-weight: 700;
  font-size: 13px;
  color: var(--text);
}

.help-panel dd {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-left: 0;
}

/* ===== Settings ===== */
.settings-group {
  margin-bottom: 20px;
}

.settings-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.settings-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

.settings-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.theme-picker, .accent-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.theme-swatch, .accent-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px;
  border: 2px solid transparent;
  border-radius: 8px;
  background: none;
  cursor: pointer;
  transition: all 0.2s;
}

.theme-swatch:hover, .accent-swatch:hover {
  border-color: var(--accent-light);
}

.theme-swatch.active, .accent-swatch.active {
  border-color: var(--accent);
}

.swatch-color {
  display: block;
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.swatch-name {
  font-size: 10px;
  color: var(--text-secondary);
}

.accent-swatch .swatch-color {
  width: 28px;
  height: 28px;
}

/* ===== Save Modal ===== */
.save-section {
  margin-bottom: 20px;
}

.save-section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.save-row {
  display: flex;
  gap: 8px;
}

.save-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
}

.save-input:focus {
  outline: none;
  border-color: var(--accent);
}

.btn-outline {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}

.export-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.file-import-label {
  cursor: pointer;
  display: inline-block;
}

.saved-works-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 240px;
  overflow-y: auto;
}

.saved-work-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  transition: border-color 0.2s;
}

.saved-work-item:hover {
  border-color: var(--accent-light);
}

.saved-work-info {
  flex: 1;
  min-width: 0;
}

.saved-work-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.saved-work-meta {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.saved-work-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
  margin-left: 10px;
}

.saved-work-actions button {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
  font-size: 11px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
}

.saved-work-actions button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.saved-work-actions .btn-delete:hover {
  border-color: #e55;
  color: #e55;
}

.empty-message {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
  padding: 16px;
}

/* ===== Beta Badge ===== */
.beta-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, #f59e0b, #d97706);
  padding: 2px 8px;
  border-radius: 10px;
  vertical-align: middle;
  margin-left: 6px;
  letter-spacing: 0.05em;
}

/* ===== Beta Notice ===== */
.beta-notice {
  padding: 12px 16px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-light);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

/* ===== Analyze Modal ===== */
.modal-tall {
  max-height: 90vh;
}

.analyze-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  font-size: 12px;
  color: var(--text-secondary);
}

.stat-chip strong {
  color: var(--accent);
}

.analyze-field {
  margin-bottom: 18px;
}

.analyze-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.analyze-textarea {
  width: 100%;
  min-height: 70px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  line-height: 1.6;
}

.analyze-textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.analyze-charcount {
  display: block;
  text-align: right;
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.analyze-suggestions {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.suggestion-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  font-size: 13px;
}

.suggestion-item .suggestion-text {
  flex: 1;
  color: var(--text);
}

.suggestion-item .suggestion-copy {
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 10px;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}

.suggestion-item .suggestion-copy:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.suggestion-item .suggestion-copy.copied {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.analyze-characters {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.character-card {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
}

.character-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.character-detail {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  line-height: 1.5;
}

.no-result {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 10px;
  text-align: center;
  background: var(--bg-secondary);
  border-radius: 6px;
}

/* ===== Settings Desc ===== */
.settings-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.5;
}

/* ===== Split Tabs ===== */
.split-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--border);
}

.split-tab {
  padding: 8px 20px;
  border: none;
  background: none;
  font-size: 13px;
  font-family: inherit;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
}

.split-tab:hover {
  color: var(--accent);
}

.split-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 700;
}

.split-panel {
  display: none;
}

.split-panel.active {
  display: block;
}

/* ===== Chapter Split ===== */
.chapter-part-title {
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
  margin-left: 8px;
}

/* ===== Loading Overlay ===== */
.analyze-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  gap: 16px;
}

.analyze-loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.analyze-loading-text {
  font-size: 13px;
  color: var(--text-secondary);
}

.analyze-error {
  padding: 12px 16px;
  background: #fef2f2;
  border: 1px solid #fca5a5;
  border-radius: 6px;
  font-size: 13px;
  color: #dc2626;
  margin-bottom: 16px;
}

[data-theme="dark"] .analyze-error {
  background: #3a1a1a;
  border-color: #7f1d1d;
  color: #fca5a5;
}

/* ===== Undo Toast ===== */
.undo-toast {
  position: fixed;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: #333;
  color: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  z-index: 200;
  font-size: 13px;
  animation: toastSlideUp 0.3s ease;
}

.undo-toast[hidden] {
  display: none;
}

@keyframes toastSlideUp {
  from { transform: translateX(-50%) translateY(20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

.undo-toast-btn {
  padding: 6px 16px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.undo-toast-btn:hover {
  filter: brightness(1.2);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-light);
}

/* ===== Footer ===== */
.app-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 20px;
  background: var(--header-bg);
  border-top: 1px solid var(--border);
  font-size: 11px;
  flex-shrink: 0;
}

.app-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

.app-footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.footer-sep {
  color: var(--border);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  #app-header {
    flex-direction: column;
    gap: 8px;
    padding: 8px 12px;
  }

  .header-auth {
    margin-left: 0;
    margin-right: 0;
    justify-content: center;
  }

  .user-name {
    display: none;
  }

  .header-right {
    flex-wrap: wrap;
    justify-content: center;
  }

  .toolbar-btn span:not(.btn-icon) {
    display: none;
  }

  .modal {
    width: 96%;
    max-height: 90vh;
  }

  .help-body {
    flex-direction: column;
  }

  .help-nav {
    flex-direction: row;
    min-width: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
  }

  .help-tab {
    border-left: none;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
  }

  .help-tab.active {
    border-left-color: transparent;
    border-bottom-color: var(--accent);
  }
}

/* ===== 書字方向切り替え ===== */

.direction-picker {
  display: flex;
  gap: 8px;
}

.direction-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  font-size: 13px;
}

.direction-btn:hover {
  border-color: var(--accent-light);
  color: var(--text);
}

.direction-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
  font-weight: 600;
}

.direction-icon {
  font-size: 16px;
}

/* 横書きモード */
#novel-editor.horizontal-mode {
  writing-mode: horizontal-tb;
  text-orientation: mixed;
  overflow-x: hidden;
  overflow-y: auto;
}

#editor-wrapper.horizontal-mode {
  overflow-x: hidden;
  overflow-y: auto;
}