:root {
  --bg: #f4f5f8;
  --card: #ffffff;
  --text: #1d2130;
  --muted: #6b7280;
  --border: #e3e6ec;
  --primary: #2a2a73;
  --primary-hover: #1d1d58;
  --primary-soft: #ececf8;
  --good: #16a34a;
  --warn: #d97706;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --card: #1e2128;
    --text: #e8eaef;
    --muted: #9aa1ad;
    --border: #2f333d;
    --primary: #7d80e6;
    --primary-hover: #979aef;
    --primary-soft: #262845;
    --good: #4ade80;
    --warn: #fbbf24;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }
.hint { color: var(--muted); font-size: 12.5px; margin: 6px 0 0; }
.good { color: var(--good); font-weight: 600; }

/* ---------- Header ---------- */
.topbar { display: flex; align-items: center; gap: 24px; padding: 12px 24px; background: var(--card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 5; }
.logo { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 20px; letter-spacing: -.3px; white-space: nowrap; }
.logo img { width: 32px; height: 32px; }
@media (prefers-color-scheme: dark) { .logo img { background: #fff; border-radius: 50%; } }
.logo span { color: var(--primary); margin-left: -5px; font-weight: 600; }
.tabs { display: flex; gap: 4px; background: var(--bg); padding: 4px; border-radius: 10px; }
.tab { border: 0; background: none; color: var(--muted); padding: 8px 18px; border-radius: 8px; font: inherit; font-weight: 600; cursor: pointer; }
.tab.active { background: var(--card); color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, .12); }
.privacy { margin-left: auto; color: var(--muted); font-size: 13px; }

/* ---------- Layout ---------- */
main { max-width: 1280px; margin: 0 auto; padding: 20px 16px 40px; }
.panel { display: none; grid-template-columns: 320px 1fr; gap: 20px; align-items: start; }
.panel.active { display: grid; }

.options { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 6px 16px 14px; position: sticky; top: 76px; max-height: calc(100vh - 96px); overflow: auto; }
fieldset { border: 0; border-bottom: 1px solid var(--border); margin: 0; padding: 12px 0 14px; min-width: 0; }
fieldset:last-of-type { border-bottom: 0; }
legend { font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .4px; color: var(--muted); padding: 0; margin-bottom: 8px; float: left; width: 100%; }
legend label { cursor: pointer; display: flex; gap: 6px; align-items: center; }
legend + * { clear: both; }
.row { display: flex; flex-direction: column; gap: 4px; margin-top: 10px; font-size: 13.5px; font-weight: 500; }
.row output { font-weight: 700; }
select, input[type=text], input[type=number] { font: inherit; padding: 7px 9px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text); width: 100%; }
input[type=range] { width: 100%; accent-color: var(--primary); }
input[type=checkbox], input[type=radio] { accent-color: var(--primary); }
.check { display: flex; gap: 6px; align-items: center; font-size: 13.5px; margin-top: 8px; cursor: pointer; }
.inline { display: flex; gap: 10px; margin-top: 10px; }
.inline label { flex: 1; font-size: 13px; display: flex; flex-direction: column; gap: 4px; }
.sub.disabled { opacity: .45; pointer-events: none; }

.seg { display: flex; background: var(--bg); border-radius: 10px; padding: 3px; }
.seg label { flex: 1; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: block; text-align: center; padding: 7px 0; border-radius: 8px; font-weight: 700; font-size: 14px; cursor: pointer; color: var(--muted); }
.seg input:checked + span { background: var(--primary); color: #fff; }
.seg input:focus-visible + span { outline: 2px solid var(--primary); outline-offset: 1px; }

.levels { display: flex; flex-direction: column; gap: 6px; }
.levels label { display: flex; gap: 10px; align-items: flex-start; padding: 9px 10px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer; }
.levels label:has(input:checked) { border-color: var(--primary); background: var(--primary-soft); }
.levels input { margin-top: 3px; }
.levels b { display: block; font-size: 14px; }
.levels small { color: var(--muted); font-size: 12.5px; }

.wm-preview { margin-top: 10px; }
.wm-preview canvas { display: block; width: 100%; border-radius: 8px; border: 1px solid var(--border); cursor: grab; touch-action: none; }
.wm-preview canvas.dragging { cursor: grabbing; }
.logo-upload { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.logo-upload img { max-width: 120px; max-height: 48px; padding: 4px; border-radius: 6px; border: 1px solid var(--border); background: repeating-conic-gradient(#d9dbe1 0 25%, #fff 0 50%) 0 0 / 10px 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 8px; }
.chips button { font: 12px ui-monospace, Menlo, monospace; padding: 3px 7px; border-radius: 6px; border: 1px solid var(--border); background: var(--bg); color: var(--text); cursor: pointer; }
.chips button:hover { border-color: var(--primary); }

/* ---------- Buttons ---------- */
.btn { font: inherit; font-weight: 600; border: 1px solid var(--border); background: var(--card); color: var(--text); padding: 8px 16px; border-radius: 9px; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: 6px; white-space: nowrap; }
.btn:hover:not(:disabled) { border-color: var(--muted); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover:not(:disabled) { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover:not(:disabled) { background: var(--bg); }
.btn.big { padding: 13px 28px; font-size: 16px; border-radius: 11px; }
.btn.small { padding: 5px 11px; font-size: 13px; }
.btn.icon { padding: 5px 9px; color: var(--muted); }

/* ---------- Workspace ---------- */
.dropzone { background: var(--card); border: 2px dashed var(--border); border-radius: var(--radius); padding: 36px 16px; text-align: center; cursor: pointer; transition: border-color .15s, background .15s; }
.dropzone:hover, .dropzone.over { border-color: var(--primary); }
.dropzone.over { background: var(--primary-soft); }
.dz-icon { font-size: 30px; color: var(--primary); }
.dz-buttons { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 10px; }
.dz-text { margin: 12px 0 0; color: var(--muted); }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; margin: 16px 0 10px; }
.summary { color: var(--muted); }
.summary b { color: var(--text); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

.file-list { display: flex; flex-direction: column; gap: 6px; }
.file-row { display: grid; grid-template-columns: 52px minmax(0, 1fr) auto auto; gap: 12px; align-items: center; background: var(--card); border: 1px solid var(--border); border-radius: 11px; padding: 7px 10px; }
.thumb { width: 52px; height: 52px; border-radius: 8px; background: var(--bg); display: grid; place-items: center; overflow: hidden; font-size: 10.5px; font-weight: 700; color: var(--muted); }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sub-line { color: var(--muted); font-size: 12.5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.status { font-size: 13px; color: var(--muted); min-width: 56px; text-align: right; }
.file-row.working .status { color: var(--warn); }
.file-row.error .status { color: var(--primary); font-weight: 600; }
.file-row.error .sub-line { white-space: normal; }
.row-actions { display: flex; gap: 4px; }

/* ---------- Compare dialog ---------- */
dialog { border: 0; border-radius: var(--radius); padding: 14px; background: var(--card); color: var(--text); width: min(1100px, calc(100vw - 32px)); }
dialog::backdrop { background: rgba(0, 0, 0, .6); }
.compare-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.compare-box { position: relative; height: min(75vh, 800px); background: repeating-conic-gradient(var(--bg) 0 25%, var(--card) 0 50%) 0 0 / 20px 20px; border-radius: 10px; overflow: hidden; }
.compare-box img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.compare-line { position: absolute; top: 0; bottom: 0; width: 2px; background: #fff; box-shadow: 0 0 6px rgba(0, 0, 0, .5); transform: translateX(-1px); pointer-events: none; }
.compare-box input[type=range] { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; cursor: ew-resize; margin: 0; }
.tag { position: absolute; top: 10px; background: rgba(0, 0, 0, .6); color: #fff; font-size: 12px; padding: 3px 8px; border-radius: 6px; pointer-events: none; }
.tag.left { left: 10px; }
.tag.right { right: 10px; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 140%); background: #1d2130; color: #fff; padding: 11px 18px; border-radius: 10px; font-size: 14px; transition: transform .25s; z-index: 20; max-width: calc(100vw - 32px); }
.toast.show { transform: translate(-50%, 0); }

.file-warning { background: #fff4d6; color: #7a4b00; padding: 12px 16px; text-align: center; font-size: 14px; }

@media (max-width: 860px) {
  .panel.active { display: flex; flex-direction: column; }
  .options { position: static; max-height: none; width: 100%; }
  .workspace { width: 100%; order: -1; }
  .privacy { display: none; }
  .topbar { padding: 10px 16px; gap: 12px; }
  .file-row { grid-template-columns: 44px minmax(0, 1fr) auto; }
  .file-row .status { display: none; }
  .thumb { width: 44px; height: 44px; }
}

@media (prefers-color-scheme: dark) {
  .btn.primary, .seg input:checked + span { color: #11122b; }
}