:root {
  --bg: #0d0d0d;
  --surface: #16161c;
  --inset: #111;
  --elevated: #1e1e26;
  --border: #2a2a33;
  --border-strong: #3a3a45;
  --text: #e8e8e8;
  --muted: #9a9aa5;
  --faint: #6a6a75;
  --accent: #2a6df0;
  --accent-text: #fff;
  --link: #5b9af0;
  --ok: #3fb950;
  --warn: #d8a325;
  --error-bg: rgba(255, 60, 60, 0.12);
  --error-border: rgba(255, 80, 80, 0.4);
  --error-text: #ff9b9b;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa; --surface: #fff; --inset: #f5f5f5; --elevated: #f0f0f0;
    --border: #e0e0e0; --border-strong: #d0d0d0; --text: #1a1a1a;
    --muted: #666; --faint: #999; --accent: #1a1a1a; --link: #1a73e8;
    --ok: #1a7f37; --warn: #9a6700;
    --error-bg: #fff0f0; --error-border: #ffccc7; --error-text: #cf1322;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 1.15rem; margin: 0; letter-spacing: 0.02em; }
.tagline { color: var(--faint); font-size: 0.85rem; }

.wrap { max-width: 820px; margin: 0 auto; padding: 24px 16px 64px; }

/* ---- selection stage ---- */
.drop {
  position: relative;
  border: 2px dashed var(--border-strong);
  border-radius: 14px;
  background: var(--inset);
  min-height: 240px;
  display: flex; align-items: center; justify-content: center; text-align: center;
  cursor: pointer; overflow: hidden;
  transition: border-color 0.15s, background 0.15s;
}
.drop.dragging { border-color: var(--accent); background: var(--elevated); }
.drop.has-image { cursor: crosshair; touch-action: none; }
.hint { padding: 32px; }
.hint-big { font-size: 1.25rem; font-weight: 600; }
.hint-sub { margin-top: 8px; font-size: 0.9rem; color: var(--muted); }
.preview {
  max-width: 100%; max-height: 440px; display: none; object-fit: contain;
  user-select: none; -webkit-user-drag: none;
}
.preview.show { display: block; }
.selbox {
  position: absolute;
  border: 2px solid var(--accent);
  background: rgba(42, 109, 240, 0.16);
  border-radius: 2px;
  pointer-events: none;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.18);
}

.stagebar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  margin-top: 12px;
}
.stage-info { font-size: 0.9rem; }
#stageinfo { font-weight: 600; }
.stage-help { color: var(--muted); }
.stage-actions { display: flex; gap: 8px; }
.stagedone {
  margin-top: 14px; padding: 14px 16px; border-radius: 10px;
  background: var(--elevated); border: 1px solid var(--border); color: var(--muted);
  font-size: 0.9rem; text-align: center;
}

/* ---- buttons ---- */
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
button {
  padding: 9px 16px; border: 1px solid var(--border-strong); border-radius: 8px;
  background: var(--accent); color: var(--accent-text); font-size: 0.9rem; cursor: pointer;
}
button.secondary { background: var(--surface); color: var(--text); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.error {
  margin-top: 16px; padding: 12px 14px; border-radius: 8px; font-size: 0.9rem;
  background: var(--error-bg); border: 1px solid var(--error-border); color: var(--error-text);
}

/* ---- AI reader toggle ---- */
.ai-toggle { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 18px; font-size: 0.9rem; cursor: pointer; }
.ai-strong { color: var(--accent); font-weight: 600; }
.ai-note { color: var(--faint); font-size: 0.8rem; }

/* ---- expected-format panel ---- */
.fmt { margin-top: 18px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); padding: 4px 14px; }
.fmt > summary { cursor: pointer; padding: 8px 0; font-size: 0.9rem; }
.fmt-hint { color: var(--muted); font-weight: 400; }
.fmt-grid { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; padding: 6px 0 12px; }
.fmt-grid label { font-size: 0.85rem; color: var(--muted); display: inline-flex; align-items: center; gap: 6px; }
.fmt-grid input[type="number"] { width: 54px; }
.fmt-grid input[type="text"] { padding: 5px 8px; border: 1px solid var(--border-strong); border-radius: 6px; background: var(--inset); color: var(--text); font-family: ui-monospace, monospace; }
.fmt-grid input[type="number"] { padding: 5px 6px; border: 1px solid var(--border-strong); border-radius: 6px; background: var(--inset); color: var(--text); }
#fmtSep { width: 36px; text-align: center; }
.fmt-alpha { flex-basis: 100%; }
.fmt-alpha input { flex: 1; min-width: 0; }
.fmt-note { flex-basis: 100%; margin: 2px 0 0; font-size: 0.78rem; color: var(--faint); }
.fmt-note code { background: var(--inset); padding: 1px 4px; border-radius: 4px; }

/* ---- results ---- */
.results { margin-top: 30px; }
.results-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.results-head h2 { font-size: 1rem; margin: 0; }
.stats { font-weight: 400; color: var(--muted); font-size: 0.85rem; }
.results-actions { display: flex; gap: 8px; }
.results-actions button { padding: 7px 12px; font-size: 0.85rem; }

.rows { margin-top: 14px; display: flex; flex-direction: column; gap: 10px; }
.row {
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface);
  padding: 12px 14px;
}
.row-head { display: flex; align-items: center; gap: 10px; }
.row-name {
  font-size: 0.85rem; color: var(--muted); overflow: hidden; text-overflow: ellipsis;
  white-space: nowrap; flex: 1; min-width: 0;
}
.pill {
  font-size: 0.72rem; padding: 2px 8px; border-radius: 999px; white-space: nowrap;
  background: var(--elevated); color: var(--muted); border: 1px solid var(--border);
}
.pill.running { color: var(--accent); border-color: var(--accent); }
.pill.done { color: var(--ok); border-color: var(--ok); }
.pill.error { color: var(--error-text); border-color: var(--error-border); }
.pill.skipped { color: var(--faint); }

.row-key { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.key {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.05rem; font-weight: 700; letter-spacing: 0.06em;
  padding: 7px 11px; border-radius: 7px;
  background: var(--elevated); border: 1px solid var(--border-strong); color: var(--text);
  cursor: pointer;
}
.key:hover { border-color: var(--accent); }
.key-flag { font-size: 0.78rem; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); }
.key-flag.ok { color: var(--ok); border-color: var(--ok); }
.key-flag.warn { color: var(--warn); border-color: var(--warn); }

.row-codes { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.code {
  display: inline-flex; align-items: center; gap: 7px; padding: 6px 10px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.95rem; font-weight: 600; letter-spacing: 0.03em;
  background: var(--elevated); border: 1px solid var(--border-strong);
  border-radius: 7px; color: var(--text); cursor: pointer;
}
.code:hover { border-color: var(--accent); }
.code .copy { color: var(--muted); font-size: 0.8rem; }

.row-text { margin-top: 8px; }
.row-text summary { cursor: pointer; color: var(--muted); font-size: 0.82rem; }
.row-text pre {
  white-space: pre-wrap; word-break: break-word; margin: 8px 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.86rem; line-height: 1.5; color: var(--text);
  background: var(--inset); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px;
}
.row-empty { margin-top: 8px; color: var(--faint); font-size: 0.85rem; }

.footnote { margin-top: 36px; font-size: 0.78rem; color: var(--faint); text-align: center; }
.footnote a { color: var(--link); }