:root {
  --color-bg: #f6f7f8;
  --color-surface: #ffffff;
  --color-border: #dde2e7;
  --color-border-hover: #b8c2cc;
  --color-text: #14202b;
  --color-text-secondary: #51606e;
  --color-accent: #0d9488;
  --color-accent-hover: #0f766e;
  --color-accent-muted: rgba(13, 148, 136, 0.08);
  --color-danger: #dc2626;
}

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

/* display指定のある要素でもhidden属性を必ず有効にする */
[hidden] { display: none !important; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* ヘッダー */
header {
  background: linear-gradient(135deg, #0f2027 0%, #2c5364 100%);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
  text-align: center;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

header h1 .accent { color: #5eead4; }

header p {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.75);
  margin-top: 4px;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 24px 64px;
}

/* プライバシー注記（ヘッダー内バッジ） */
.header-privacy {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 6px 14px;
  border: 1px solid rgba(94, 234, 212, 0.4);
  border-radius: 999px;
  color: #5eead4;
  font-size: 1rem;
}

.header-privacy svg { flex-shrink: 0; }

.card {
  background: var(--color-surface);
  border-radius: 12px;
  padding: 20px;
  border: 1px solid var(--color-border);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.quality-value {
  font-family: 'JetBrains Mono', monospace;
  color: var(--color-accent);
  margin-left: 4px;
}

/* フォーム要素 */
.radio-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 2px;
}

.radio-item input {
  accent-color: var(--color-accent);
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

.hint {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: 8px;
  line-height: 1.5;
}

/* 出力形式（横並びピル） */
.format-card { margin-top: 16px; }

.format-group {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 8px;
}

.format-group .radio-item {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 8px 14px;
  transition: border-color 0.2s, background 0.2s;
}

.format-group .radio-item:hover { border-color: var(--color-border-hover); }

.format-group .radio-item:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-muted);
  font-weight: 500;
}

#quality-row {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
}

/* AIモデルの準備状況 */
.model-status {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.model-progress-track {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: var(--color-border);
  overflow: hidden;
}

.model-progress-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--color-accent);
  transition: width 0.2s;
}

.model-status.ready { color: var(--color-accent); }

/* 実行ボタン */
.run-button {
  width: 100%;
  margin-top: 16px;
  padding: 14px;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s;
}

.run-button:hover:not(:disabled) { background: var(--color-accent-hover); }

.run-button:disabled {
  background: var(--color-border);
  color: var(--color-text-secondary);
  cursor: not-allowed;
}

/* ドロップゾーン */
.drop-zone {
  border: 2px dashed var(--color-border-hover);
  border-radius: 12px;
  background: var(--color-surface);
  padding: 48px 24px;
  text-align: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--color-accent);
  background: var(--color-accent-muted);
}

.drop-main { font-size: 1.1rem; font-weight: 500; margin-top: 12px; color: var(--color-text); }
.drop-sub { font-size: 1rem; margin-top: 4px; }

/* 選択済みファイルのプレビュー */
.drop-zone.has-files { padding: 20px; }

.drop-previews {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.preview-tile { position: relative; }

.preview-tile img {
  display: block;
  width: 192px;
  height: 192px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: repeating-conic-gradient(#e5e7eb 0% 25%, #fff 0% 50%) 0 / 16px 16px;
}

.preview-remove {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-text);
  color: #fff;
  border: none;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-remove:hover { background: var(--color-danger); }

.preview-add {
  width: 192px;
  height: 192px;
  border: 2px dashed var(--color-border-hover);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 2rem;
}

.drop-zone:hover .preview-add { border-color: var(--color-accent); color: var(--color-accent); }

/* サマリーバー */
.summary-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 14px 20px;
  margin-top: 16px;
  font-size: 1rem;
}

.summary-bar strong { color: var(--color-accent); }

.zip-button {
  padding: 10px 20px;
  background: var(--color-text);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: opacity 0.2s;
}

.zip-button:hover { opacity: 0.85; }

/* 結果リスト */
.result-list {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-item {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 16px;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 16px;
}

.result-thumb {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: repeating-conic-gradient(#e5e7eb 0% 25%, #fff 0% 50%) 0 / 16px 16px;
}

.result-name {
  font-weight: 500;
  word-break: break-all;
  font-size: 1rem;
}

.result-meta {
  font-size: 1rem;
  color: var(--color-text-secondary);
  font-family: 'JetBrains Mono', monospace;
}

.result-status { font-size: 1rem; color: var(--color-text-secondary); }
.result-status.error { color: var(--color-danger); }

.dl-button {
  padding: 8px 16px;
  background: #fff;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.dl-button:hover { background: var(--color-accent); color: #fff; }

/* 説明セクション */
.info-section {
  margin-top: 48px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 28px 32px;
}

.info-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

.info-section ul, .info-section ol { padding-left: 24px; }
.info-section li { margin-bottom: 8px; }

.faq dt {
  font-weight: 700;
  margin-top: 16px;
}

.faq dt::before { content: 'Q. '; color: var(--color-accent); }

.faq dd { margin-top: 4px; color: var(--color-text-secondary); }

/* ライセンスクレジット */
.credit {
  margin-top: 24px;
  text-align: center;
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.credit a { color: inherit; }

/* フッター */
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 40px;
  margin-top: 48px;
  color: #64748b;
  font-size: 1rem;
  border-top: 1px solid #e2e8f0;
  background: #fff;
}

footer a {
  color: #1e293b;
  text-decoration: none;
  transition: color 0.2s;
}

footer a:hover { color: #3b82f6; }

.footer-links { display: flex; gap: 16px; }

.footer-links a {
  border: 1px solid #e2e8f0;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 1rem;
  transition: all 0.2s;
}

.footer-links a:hover { border-color: #3b82f6; color: #3b82f6; }

/* レスポンシブ */
@media (max-width: 860px) {
  .info-section { padding: 20px; }
  .result-item { grid-template-columns: 48px 1fr; }
  .result-thumb { width: 48px; height: 48px; }
  .result-actions { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  footer { flex-direction: column; gap: 16px; padding: 24px 16px; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
}