:root {
  --bg: #F4F5F7;
  --panel: #FFFFFF;
  --field: #F7F8FA;
  --border: #E4E7EC;
  --border-strong: #D0D5DD;
  --text: #17181C;
  --muted: #6B7280;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-soft: #EBF1FF;
  --err: #DC2626;
  --err-soft: #FEF2F2;
  --ok: #16A34A;
  --warn: #D97706;
  --shadow: 0 1px 2px rgba(16,24,40,.05), 0 8px 24px rgba(16,24,40,.06);
  --radius: 12px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", sans-serif;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; height: 56px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 15px; margin: 0; font-weight: 650; letter-spacing: -.01em; }
.brand .sub { color: var(--muted); font-weight: 400; font-size: 12px; margin-left: 2px; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--warn); display: inline-block; }
.dot.on { background: var(--ok); }
.dot.err { background: var(--err); }
.status-label {
  color: var(--muted); font-size: 12px; font-weight: 500;
  border: 1px solid var(--border); background: var(--field);
  padding: 4px 10px; border-radius: 999px;
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: 356px 1fr;
  gap: 16px;
  padding: 16px 20px 20px;
  min-height: 0;
  max-width: 1680px;
  width: 100%;
  margin: 0 auto;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  overflow-y: auto;
  align-self: start;
}
.ctl { padding: 12px 0; border-bottom: 1px solid var(--border); transition: opacity .15s; }
.ctl:first-child { padding-top: 0; }
.ctl:last-of-type { border-bottom: none; }
.lbl { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin: 0 0 6px; letter-spacing: .02em; }
.lbl-row { display: flex; align-items: center; gap: 8px; }
.lbl-row .lbl { margin: 0; }
.hint { color: var(--muted); font-size: 12px; }
.hint.small { margin-top: 10px; font-size: 11px; }

textarea, input[type="text"] {
  width: 100%;
  background: var(--field);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 11px;
  font: inherit;
  resize: vertical;
  transition: border-color .15s, box-shadow .15s;
}
textarea::placeholder, input::placeholder { color: #98A2B3; }
textarea:focus, input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chip {
  background: var(--field); color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 4px 10px; font: inherit; font-size: 12px; cursor: pointer;
  max-width: 100%;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  transition: border-color .15s, color .15s, background .15s;
}
.chip:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.chip:active:not(:disabled) { transform: scale(.97); }

.refs { display: flex; flex-wrap: wrap; gap: 8px; min-height: 8px; margin-top: 8px; }
.ref { position: relative; }
.ref img {
  width: 60px; height: 60px; object-fit: cover;
  border-radius: 8px; border: 1px solid var(--border);
  display: block;
}
.ref button {
  position: absolute; top: -6px; right: -6px;
  width: 18px; height: 18px; border-radius: 50%;
  background: var(--text); color: #fff;
  border: 1px solid #fff;
  cursor: pointer; font-size: 11px; line-height: 1;
  padding: 0;
  display: flex; align-items: center; justify-content: center;
}
.ref button:hover { background: var(--err); }

.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg button {
  background: var(--field); color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px; font: inherit; font-size: 12.5px;
  cursor: pointer; transition: all .15s;
}
.seg button:hover:not(:disabled) { border-color: var(--border-strong); color: var(--text); }
.seg button.on {
  background: var(--accent-soft); border-color: var(--accent);
  color: var(--accent); font-weight: 600;
}
.seg button:active:not(:disabled) { transform: scale(.97); }
.seg-lbl { margin-top: 12px; }

.seed-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.lbl.inline { margin: 0; flex: 0 0 auto; }
.seed-row input { flex: 1; width: auto; }

.check {
  display: flex; align-items: center; gap: 8px;
  margin: 12px 0 0; color: var(--text); font-size: 13px; cursor: pointer;
  user-select: none;
}
.check input { accent-color: var(--accent); width: 15px; height: 15px; }

button {
  background: var(--field);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 14px;
  font: inherit;
  cursor: pointer;
  transition: all .15s;
}
button:hover:not(:disabled) { border-color: var(--border-strong); }
button:active:not(:disabled) { transform: scale(.98); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.primary, a.primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); border-color: var(--accent);
  color: #fff; font-weight: 600;
  width: 100%; padding: 11px;
  border-radius: 10px;
  text-decoration: none;
}
button.primary:hover:not(:disabled), a.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button.primary.danger { background: var(--err); border-color: var(--err); }
button.primary.danger:hover:not(:disabled) { background: #B91C1C; border-color: #B91C1C; }
button.ghost, a.ghost { background: transparent; padding: 7px 12px; font-size: 13px; color: var(--muted); border-color: transparent; }
button.ghost:hover, a.ghost:hover { color: var(--text); background: var(--field); }
button.ghost.sm { padding: 3px 10px; font-size: 12px; color: var(--muted); }
button.ghost.sm:hover { color: var(--text); }

a.primary.dl {
  width: auto;
  padding: 9px 18px;
  font-size: 13.5px;
}
a[hidden] { display: none; }

.is-disabled { opacity: .45; pointer-events: none; }

.stage {
  display: flex; flex-direction: column;
  min-width: 0; min-height: 0;
  position: relative;
}
.result {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  min-height: 320px;
  min-width: 0;
}
.canvas {
  position: relative;
  background: repeating-conic-gradient(#F2F3F5 0% 25%, #E9EBEF 0% 50%) 0 0 / 20px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.canvas img {
  max-width: 100%; max-height: 100%;
  width: 100%; height: 100%;
  object-fit: contain;
  display: block;
}
.ph { color: #98A2B3; font-size: 13px; user-select: none; }
.dim {
  position: absolute; bottom: 8px; right: 8px;
  font-size: 11px; font-weight: 500; color: var(--muted);
  background: rgba(255,255,255,.92);
  border: 1px solid var(--border);
  border-radius: 999px; padding: 2px 9px;
  font-variant-numeric: tabular-nums;
}

.busy {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; gap: 12px;
  align-items: center; justify-content: center;
  background: rgba(244,245,247,.75);
  backdrop-filter: blur(3px);
  border-radius: var(--radius);
  z-index: 3;
}
.busy[hidden] { display: none; }
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.busy-text { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.cancel {
  background: #fff; color: var(--err);
  border: 1px solid var(--err);
  border-radius: 999px;
  padding: 7px 18px; font-size: 13px; font-weight: 600;
}
.cancel:hover { background: var(--err-soft); }

.actions {
  display: flex; gap: 10px; justify-content: center; align-items: center;
  margin-top: 12px;
}
.meta {
  text-align: center; color: var(--muted); font-size: 12px;
  margin-top: 8px; min-height: 16px;
  font-variant-numeric: tabular-nums;
}

.toast {
  position: fixed; left: 50%; bottom: 24px;
  transform: translateX(-50%);
  background: #fff; color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 10px 16px; border-radius: 10px;
  font-size: 13px; z-index: 10;
  max-width: 80vw;
}
.toast.err { border-color: var(--err); color: var(--err); }

@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .panel { max-height: 48vh; }
}