:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --card-soft: #f8fafc;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-soft: #475569;
  --accent: #2563eb;
  --accent-soft: #4f46e5;
  --accent-2: #0ea5e9;
  --danger: #dc2626;
  --success: #16a34a;
  --field-bg: #ffffff;
  --badge-bg: #e0e7ff;
  --badge-text: var(--accent-soft);
  --privacy-bg: #f0fdf4;
  --privacy-border: #86efac;
  --privacy-text: #166534;
  --dragover-bg: #eff6ff;
  --meta-badge-bg: #fef3c7;
  --meta-badge-text: #92400e;
  --meta-badge-border: #fcd34d;
  --shadow: 0 24px 64px rgba(15, 23, 42, 0.10);
  color: var(--text);
  background: var(--bg);
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Roboto, Arial, sans-serif;
}

/* ── ダークモード ──────────────────────────────────────────────
   未指定時は OS 設定に追従し、手動トグル時は data-theme で固定する。 */
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1120;
  --card: #131c2e;
  --card-soft: #182234;
  --border: #2b394f;
  --border-strong: #3b4c66;
  --text: #e6edf7;
  --text-soft: #9fb0c7;
  --accent: #60a5fa;
  --accent-soft: #818cf8;
  --accent-2: #38bdf8;
  --danger: #f87171;
  --success: #4ade80;
  --field-bg: #0f1828;
  --badge-bg: #312e81;
  --badge-text: #c7d2fe;
  --privacy-bg: #0f2a1c;
  --privacy-border: #1f6f43;
  --privacy-text: #86efac;
  --dragover-bg: #15233b;
  --meta-badge-bg: #3a2e0a;
  --meta-badge-text: #fcd34d;
  --meta-badge-border: #78611a;
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0b1120;
    --card: #131c2e;
    --card-soft: #182234;
    --border: #2b394f;
    --border-strong: #3b4c66;
    --text: #e6edf7;
    --text-soft: #9fb0c7;
    --accent: #60a5fa;
    --accent-soft: #818cf8;
    --accent-2: #38bdf8;
    --danger: #f87171;
    --success: #4ade80;
    --field-bg: #0f1828;
    --badge-bg: #312e81;
    --badge-text: #c7d2fe;
    --privacy-bg: #0f2a1c;
    --privacy-border: #1f6f43;
    --privacy-text: #86efac;
    --dragover-bg: #15233b;
    --meta-badge-bg: #3a2e0a;
    --meta-badge-text: #fcd34d;
    --meta-badge-border: #78611a;
    --shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 24px;
}

.app-shell {
  width: min(980px, 100%);
  background: var(--card);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 32px;
}

.header-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

header h1 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 2.8rem);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
}

.header-controls {
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  flex: none;
  width: 44px;
  height: 44px;
  min-height: 44px;
  padding: 0;
  border-radius: 12px;
  background: var(--card-soft);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 1.2rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover:not(:disabled) { filter: none; background: var(--dragover-bg); }

.lang-toggle {
  flex: none;
  height: 44px;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 12px;
  background: var(--card-soft);
  border: 1px solid var(--border-strong);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 700;
}
.lang-toggle:hover:not(:disabled) { filter: none; background: var(--dragover-bg); }

.rate-link {
  display: inline-block;
  margin-top: 6px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}
.rate-link[hidden] { display: none; }
.rate-link:hover { text-decoration: underline; }

.tagline {
  margin: 4px 0 8px;
  font-weight: 600;
  color: var(--text);
  font-size: 1rem;
}

.lead {
  margin: 0 0 4px;
  color: var(--text-soft);
  font-size: 0.95rem;
}

.privacy-badge {
  margin: 12px 0 0;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--privacy-bg);
  border: 1px solid var(--privacy-border);
  color: var(--privacy-text);
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.5;
}

.card {
  background: var(--card-soft);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  margin-top: 20px;
}

/* Dropzone */
.dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: 14px;
  padding: 24px;
  text-align: center;
  transition: background 0.15s, border-color 0.15s;
}
.dropzone.is-dragover {
  border-color: var(--accent);
  background: var(--dragover-bg);
}
.dropzone-title {
  margin: 0 0 8px;
  font-weight: 700;
  font-size: 1.05rem;
}
.dropzone-or {
  margin: 0 0 12px;
  color: var(--text-soft);
}
.picker-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.file-selector {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent-2));
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
}
.file-selector.secondary {
  background: linear-gradient(135deg, #475569, #334155);
}
.file-selector input { display: none; }

.hint {
  margin: 12px 0 0;
  color: var(--text-soft);
  font-size: 0.85rem;
}

/* Options */
.options-card { display: grid; gap: 16px; }
.option-row { display: grid; gap: 8px; }
.checkbox-row .checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

label { font-weight: 600; color: var(--text); }

.target-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.target-input-row input[type="number"] {
  width: 110px;
  flex: none;
}
.target-input-row input:disabled { opacity: 0.5; }
.target-unit { color: var(--text-soft); font-size: 0.9rem; }

.value-badge {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.85rem;
  font-weight: 600;
}

select,
input[type="range"],
input[type="number"] {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border-strong);
  padding: 10px 12px;
  font-size: 1rem;
  background: var(--field-bg);
  color: var(--text);
}
input[type="range"] { padding: 6px 4px; }

.button-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

button {
  min-height: 48px;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  color: #fff;
  background: var(--accent);
  font-size: 1rem;
  font-weight: 700;
  transition: filter 0.15s, transform 0.05s;
}
button:hover:not(:disabled) { filter: brightness(1.07); }
button:active:not(:disabled) { transform: translateY(1px); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

button.ghost {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border-strong);
}

button.save-folder {
  background: var(--success);
}

/* Status */
.status-card { display: grid; gap: 10px; }
#statusText { margin: 0; color: #334155; }
progress {
  width: 100%;
  height: 14px;
  accent-color: var(--accent);
}
.summary {
  margin: 0;
  color: var(--success);
  font-weight: 600;
}

/* 合計の削減バー */
.total-bar {
  margin: 2px 0 0;
}
.total-bar[hidden] { display: none; }
.total-bar .track {
  position: relative;
  height: 12px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.total-bar .fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--success), var(--accent-2));
  transition: width 0.4s ease;
}
.total-bar .legend {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--text-soft);
}

/* Result list */
.result-card h2 { margin-top: 0; }
.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.result-head h2 { margin: 0; }
.sort-control {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
}
.sort-control label { font-weight: 600; color: var(--text-soft); white-space: nowrap; }
.sort-control select { width: auto; padding: 6px 10px; font-size: 0.85rem; }
.result-list { display: grid; gap: 10px; }

.result-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border-strong);
  background: var(--card);
}
.result-item img.thumb {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-soft);
  cursor: zoom-in;
}
.result-item.error { grid-template-columns: 1fr; }
.result-item .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  color: var(--text-soft);
  font-size: 0.85rem;
  margin-top: 4px;
}
.result-item .name {
  font-weight: 600;
  word-break: break-all;
}
.result-item.error { border-color: var(--danger); background: var(--card); }
.result-item.error .error-msg { color: var(--danger); font-size: 0.9rem; }
.result-item a.download {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}
.result-item a.download:hover { filter: brightness(1.08); }

.delta { font-weight: 600; }
.delta.good { color: var(--success); }
.delta.bad { color: var(--danger); }

.meta-hint {
  margin: 4px 0 0;
  font-size: 0.82rem;
  font-weight: 400;
}

.meta-strip-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
  margin-top: 6px;
}

.meta-strip-label {
  font-size: 0.78rem;
  color: var(--text-soft);
  font-weight: 600;
  white-space: nowrap;
}

.meta-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--meta-badge-bg);
  color: var(--meta-badge-text);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--meta-badge-border);
}

.foot {
  margin-top: 20px;
  text-align: center;
  color: var(--text-soft);
}
.foot small {
  display: block;
  margin-top: 4px;
  font-size: 0.8rem;
  line-height: 1.5;
}
.foot a {
  color: var(--accent);
  text-decoration: none;
}
.foot a:hover { text-decoration: underline; }

/* ドラッグ中の全画面オーバーレイ */
.drag-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(2px);
  pointer-events: none;
}
.drag-overlay.is-visible { display: flex; }
.drag-overlay .drag-card {
  padding: 28px 40px;
  border-radius: 18px;
  border: 2px dashed #fff;
  background: rgba(37, 99, 235, 0.85);
  color: #fff;
  font-size: 1.3rem;
  font-weight: 700;
  text-align: center;
}

/* ── プリセット（かんたん設定）─────────────────────────── */
.preset-row { display: grid; gap: 8px; }
.preset-label { font-weight: 700; font-size: 0.9rem; color: var(--text-soft); }
.preset-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 8px;
}
.preset-btn {
  min-height: 44px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: var(--card);
  color: var(--text);
  font-weight: 700;
  font-size: 0.95rem;
}
.preset-btn:hover:not(:disabled) { filter: none; background: var(--dragover-bg); }
.preset-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.preset-hint { margin-top: 0; }

/* ── 選択中ファイル一覧 ─────────────────────────────────── */
.file-list-card[hidden] { display: none; }
.file-list-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.file-list-title { margin: 0; font-size: 1.05rem; }
button.small {
  min-height: 36px;
  padding: 0 14px;
  font-size: 0.85rem;
  font-weight: 600;
}
.file-list {
  display: grid;
  gap: 6px;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 4px;
}
.file-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card);
}
.file-item-more {
  display: block;
  text-align: center;
  font-size: 0.82rem;
  opacity: 0.7;
  border-style: dashed;
}
.file-thumb {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  overflow: hidden;
  flex: none;
}
.file-thumb img { width: 100%; height: 100%; object-fit: cover; }
.file-info { min-width: 0; }
.file-info .name {
  font-weight: 600;
  font-size: 0.88rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-size { color: var(--text-soft); font-size: 0.78rem; }
.file-remove {
  width: 32px;
  height: 32px;
  min-height: 32px;
  padding: 0;
  border-radius: 8px;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-soft);
  font-size: 0.9rem;
  line-height: 1;
}
.file-remove:hover:not(:disabled) { filter: none; background: var(--dragover-bg); color: var(--danger); border-color: var(--danger); }

/* ── 詳細設定（折りたたみ）───────────────────────────────── */
.adv-details {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
}
.adv-details > summary {
  cursor: pointer;
  padding: 14px 16px;
  font-weight: 700;
  color: var(--text);
  user-select: none;
  border-radius: 14px;
}
.adv-details[open] > summary { border-bottom: 1px solid var(--border); border-radius: 14px 14px 0 0; }
.adv-details > summary:hover { background: var(--dragover-bg); }
.adv-body { display: grid; gap: 18px; padding: 16px; }
.adv-group { display: grid; gap: 10px; }
.adv-group h3 {
  margin: 0;
  font-size: 0.92rem;
  color: var(--accent);
}
.adv-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
}
.adv-field {
  display: grid;
  gap: 4px;
  font-size: 0.88rem;
  min-width: 180px;
}
.adv-field.inline { min-width: 0; }
.adv-field input[type="text"] {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border-strong);
  padding: 8px 10px;
  font-size: 0.95rem;
  background: var(--field-bg);
  color: var(--text);
}
.adv-field input[type="number"] { width: 110px; padding: 8px 10px; }
.adv-field select { padding: 8px 10px; font-size: 0.95rem; }
.adv-field input:disabled, .adv-field select:disabled { opacity: 0.5; }
.wm-grid .adv-field input[type="range"] { min-width: 160px; }

/* ── 保存カード（変換完了後に表示）───────────────────────── */
.save-card { border-color: var(--accent); }
.save-card[hidden] { display: none; }
.save-card h2 { margin: 0 0 4px; }
.save-lead { margin: 0 0 14px; color: var(--text-soft); font-size: 0.9rem; }
.save-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}
.save-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  text-align: left;
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--border-strong);
  color: var(--text);
  min-height: 0;
}
.save-option:hover:not(:disabled) {
  filter: none;
  background: var(--dragover-bg);
  border-color: var(--accent);
}
.save-option:disabled { opacity: 0.45; }
.save-icon { font-size: 1.6rem; line-height: 1.2; flex: none; }
.save-texts { display: grid; gap: 4px; }
.save-name {
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.save-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-size: 0.72rem;
  font-weight: 700;
}
.save-desc {
  font-weight: 400;
  font-size: 0.82rem;
  color: var(--text-soft);
  line-height: 1.55;
}
.save-steps { margin-top: 12px; }
.save-result {
  margin: 12px 0 0;
  font-weight: 600;
  color: var(--success);
}
.save-result.is-error { color: var(--danger); }
.save-result[hidden] { display: none; }

/* ── 結果フィルタチップ ─────────────────────────────────── */
.filter-chips { display: flex; gap: 6px; }
.filter-chips[hidden] { display: none; }
.chip {
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--card);
  color: var(--text-soft);
  font-size: 0.82rem;
  font-weight: 700;
}
.chip:hover:not(:disabled) { filter: none; background: var(--dragover-bg); }
.chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.chip-failed.is-active {
  background: var(--danger);
  border-color: var(--danger);
}

/* 拡大プレビュー */
.preview-modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(15, 23, 42, 0.78);
}
.preview-modal.is-open { display: flex; }

/* Before/After スライダー比較 */
.compare-wrap {
  --split: 50%;
  position: relative;
  line-height: 0;
  touch-action: none;
  cursor: ew-resize;
}
.compare-wrap #previewImage {
  max-width: 92vw;
  max-height: 82vh;
  border-radius: 12px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  background: #fff;
}
.compare-before {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* クロップ等で変換前後の縦横比が異なっても歪まないよう中央合わせで覆う */
  object-fit: cover;
  border-radius: 12px;
  background: #fff;
  clip-path: inset(0 calc(100% - var(--split)) 0 0);
}
.compare-before[hidden] { display: none; }
.compare-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--split);
  width: 2px;
  margin-left: -1px;
  background: #fff;
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.6);
  pointer-events: none;
}
.compare-handle[hidden] { display: none; }
.compare-knob {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #fff;
  color: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.45);
  line-height: 1;
}
.compare-tag {
  position: absolute;
  top: 10px;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 0.78rem;
  line-height: 1.4;
  pointer-events: none;
}
.compare-tag[hidden] { display: none; }
.tag-before { left: 10px; }
.tag-after { right: 10px; }
.preview-modal .preview-caption {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 0.85rem;
}
.preview-modal .preview-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  min-height: 44px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.4rem;
}

@media (max-width: 640px) {
  .app-shell { padding: 20px; }
  .result-item {
    grid-template-columns: auto 1fr;
  }
  .result-item a.download {
    grid-column: 1 / -1;
    justify-self: start;
  }
}