/* ==========================================================================
   Markdown to Standalone HTML Converter - Application Styles
   ========================================================================== */

:root {
  --bg-page: #f6f8fa;
  --bg-surface: #ffffff;
  --bg-subtle: #f3f4f6;
  --text-primary: #1f2328;
  --text-secondary: #59636e;
  --border-color: #d1d9e0;
  --border-focus: #0969da;
  --accent-color: #0969da;
  --accent-hover: #0550ae;
  --success-bg: #dafbe1;
  --success-border: #82e596;
  --success-text: #1a7f37;
  --warning-bg: #fff8c5;
  --warning-border: #d4a72c;
  --warning-text: #7d4e00;
  --error-bg: #ffebe9;
  --error-border: #ff818266;
  --error-text: #cf222e;
  --radius-md: 6px;
  --radius-lg: 8px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", Helvetica, Arial, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.6;
  padding: 32px 16px;
}

.app-container {
  max-width: 760px;
  margin: 0 auto;
}

/* Header */
.app-header {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.app-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Main Content */
.app-main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* 1. Settings Panel */
.settings-panel {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.theme-select {
  width: 100%;
  max-width: 420px;
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.theme-select:focus {
  outline: 2px solid var(--border-focus);
  outline-offset: -1px;
}

.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.checkbox-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  width: fit-content;
}

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

/* 2. Drop Zone */
.drop-zone {
  background-color: var(--bg-surface);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.drop-zone:hover,
.drop-zone:focus-visible,
.drop-zone.is-dragover {
  border-color: var(--accent-color);
  background-color: #f0f6fc;
  outline: none;
}

.drop-zone-icon {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.drop-zone.is-dragover .drop-zone-icon {
  color: var(--accent-color);
}

.drop-zone-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.drop-zone-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.drop-zone-desc code {
  background-color: var(--bg-subtle);
  padding: 2px 5px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, monospace;
  font-size: 0.8rem;
}

.drop-zone-hint {
  color: var(--accent-color);
  font-weight: 500;
}

.drop-zone-actions {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-secondary {
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}

.btn-secondary:hover {
  background-color: #eaeef2;
  border-color: #afb8c1;
}

/* 3. Progress Bar */
.progress-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.875rem;
}

.progress-status {
  color: var(--text-primary);
  font-weight: 500;
}

.progress-percent {
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.progress-track {
  width: 100%;
  height: 10px;
  background-color: var(--bg-subtle);
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: var(--accent-color);
  width: 0%;
  transition: width 0.15s ease;
}

/* 4. Status & Warnings */
.result-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.status-box {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
}

.status-box.is-success {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.status-box.is-error {
  background-color: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
}

.warning-box {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 0.875rem;
}

.warning-title {
  font-weight: 600;
  margin-bottom: 6px;
}

.warning-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Offscreen container for Mermaid rendering (avoid display: none for bounding box calculation) */
.mermaid-sandbox {
  position: absolute;
  left: -9999px;
  top: -9999px;
  width: 1200px;
  visibility: hidden;
  pointer-events: none;
  overflow: hidden;
}