/* 黑暗主题（默认） */
:root,
[data-theme="dark"] {
  --bg-primary: #0f0f12;
  --bg-secondary: #18181d;
  --bg-tertiary: #222228;
  --text-primary: #e8e8ed;
  --text-secondary: #9a9aa8;
  --accent: #f59e0b;
  --accent-hover: #fbbf24;
  --accent-muted: rgba(245, 158, 11, 0.15);
  --border: #2d2d35;
  --code-bg: #1a1a20;
  --success: #22c55e;
  --radius: 10px;
  --radius-sm: 6px;
  --font-sans: 'Noto Sans SC', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* 明亮主题 */
[data-theme="light"] {
  --bg-primary: #f8f9fb;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eef0f4;
  --text-primary: #1a1c22;
  --text-secondary: #5c5e6b;
  --accent: #d97706;
  --accent-hover: #b45309;
  --accent-muted: rgba(217, 119, 6, 0.12);
  --border: #dde0e6;
  --code-bg: #eef0f4;
  --success: #15803d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
}

.app {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  margin-bottom: 2rem;
}

.logo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.language-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.language-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.language-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-muted);
}

.language-icon {
  font-size: 1rem;
  line-height: 1;
}

.language-label {
  font-size: 0.85rem;
  white-space: nowrap;
}

.language-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 140px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 100;
  overflow: hidden;
}

.language-option {
  display: block;
  width: 100%;
  padding: 0.6rem 0.85rem;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s;
}

.language-option:hover {
  background: var(--bg-tertiary);
}

.language-option:active {
  background: var(--accent-muted);
}

.theme-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}

.theme-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-muted);
}

.theme-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.theme-btn .theme-icon {
  display: none;
}

.theme-btn[data-display="auto"] .theme-icon-auto,
.theme-btn[data-display="light"] .theme-icon-light,
.theme-btn[data-display="dark"] .theme-icon-dark {
  display: inline;
}

.theme-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.logo-icon {
  width: 36px;
  height: 36px;
  color: var(--accent);
}

.logo h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Main */
.main {
  flex: 1;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.section-header h2 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.hint {
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  max-width: 100%;
}

.hint-icon {
  flex-shrink: 0;
}

.hint code {
  font-family: var(--font-mono);
  font-size: 0.75em;
  padding: 0.15em 0.4em;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
}

.cell-count {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
}

/* Input */
.input-section {
  margin-bottom: 1.25rem;
}

.input-area {
  width: 100%;
  min-height: 220px;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-area::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

.input-area:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-muted);
}

/* Buttons */
.actions {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-icon {
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--border);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Preview */
.output-section {
  flex: 1;
}

.preview-area {
  min-height: 180px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.preview-content {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.preview-cell {
  padding: 0.85rem 1rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
}

.preview-cell.cell-code {
  border-left-color: var(--accent);
}

.preview-cell.cell-markdown {
  border-left-color: var(--success);
}

.cell-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2em 0.5em;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.cell-code .cell-badge {
  background: var(--accent-muted);
  color: var(--accent);
}

.cell-markdown .cell-badge {
  background: rgba(34, 197, 94, 0.15);
  color: var(--success);
}

.cell-preview {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
}

/* Footer */
.footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer p {
  margin: 0;
}