:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --border: #e0e2e6;
  --text: #222;
  --muted: #6b7280;
  --accent: #2563eb;
  --ok: #15803d;
  --ng: #b91c1c;
  --warn-bg: #fef3c7;
  --warn-text: #92400e;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 24px;
  line-height: 1.6;
}
.app-header h1 { font-size: 20px; margin-bottom: 4px; }
.app-header .sub { color: var(--muted); font-size: 13px; margin-bottom: 24px; }

.card, .step-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
  max-width: 640px;
}
.card h2, .step-block h2 { font-size: 16px; margin: 0 0 4px; }
.step-note { color: var(--muted); font-size: 13px; margin: 0 0 16px; }

/* 1画面スクロール化: 完了したstepはスクロールで見返せるように残しつつ、編集不可にして薄く表示する */
.step-block-done { opacity: 0.55; pointer-events: none; }
.step-block-done::after { content: "✓ 完了"; display: inline-block; float: right; color: var(--ok); font-size: 12px; font-weight: 600; }

label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 4px; }
input, select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  background: #fff;
  font-family: inherit;
}

button {
  padding: 9px 16px;
  border: none;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
button:hover { opacity: 0.9; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.secondary { background: #6b7280; }
button.block { display: block; width: 100%; margin-top: 10px; }

.btn-row { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.btn-row button, .btn-row .choice-btn { flex: 1; min-width: 140px; }

.choice-btn {
  display: block;
  padding: 16px;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
}
.choice-btn:hover { border-color: var(--accent); }
.choice-btn-selected { border-color: var(--accent); background: #eff6ff; }

.required { color: var(--ng); font-weight: 600; }
.error-box { background: #fee2e2; color: var(--ng); padding: 10px 12px; border-radius: 6px; font-size: 13px; margin-top: 12px; }
.warn-box { background: var(--warn-bg); color: var(--warn-text); padding: 10px 12px; border-radius: 6px; font-size: 13px; margin-top: 12px; }
.info-box { background: #eff6ff; color: #1e3a8a; padding: 10px 12px; border-radius: 6px; font-size: 13px; margin-top: 12px; }
.carry-over-box { background: #ecfdf5; color: #065f46; padding: 8px 12px; border-radius: 6px; font-size: 13px; margin-bottom: 12px; }

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-top: 12px;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone.drag-over { border-color: var(--accent); background: #eff6ff; }
.drop-zone-hint { color: var(--muted); font-size: 12px; text-align: center; margin: 10px 0 0; }

.thumb-list { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.thumb-item { position: relative; width: 84px; }
.thumb-item .thumb-name { font-size: 11px; color: var(--muted); word-break: break-all; text-align: center; margin-top: 2px; }
.thumb-item .thumb-icon {
  width: 84px; height: 84px; border: 1px solid var(--border); border-radius: 6px;
  display: flex; align-items: center; justify-content: center; font-size: 28px; background: #f8fafc;
  object-fit: cover;
}
.thumb-item .thumb-remove {
  position: absolute; top: -8px; right: -8px; width: 22px; height: 22px; border-radius: 50%;
  background: var(--ng); color: #fff; font-size: 12px; line-height: 22px; text-align: center; padding: 0;
}

.result-row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--border); font-size: 14px; }
.result-row .k { color: var(--muted); }

.step-indicator { font-size: 12px; color: var(--muted); margin-bottom: 8px; }

.loading-overlay {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.55);
  display: flex; align-items: center; justify-content: center; z-index: 1000;
}
/* [hidden]属性はUA既定で display:none になるはずだが、上のクラス指定(同じ詳細度)が
   後勝ちで上書きしてしまい、常時表示されるバグがあった。属性セレクタを重ねて確実に隠す。 */
.loading-overlay[hidden] { display: none; }
.loading-box { background: #fff; border-radius: 10px; padding: 28px 36px; text-align: center; }
.loading-box p { margin: 12px 0 0; font-size: 14px; color: var(--text); }
.spinner {
  width: 32px; height: 32px; margin: 0 auto;
  border: 4px solid var(--border); border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }