:root {
  --bg: #f3f4f7; --surface: #fff; --text: #1d2130; --muted: #6b7183; --line: #e1e4ea;
  --accent: #e5322d; --accent-ink: #fff; --stage: #dfe2e8; --shade: rgba(15, 18, 28, .55);
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14161c; --surface: #1d2028; --text: #e8eaf0; --muted: #9298a8; --line: #2c303b; --stage: #0f1116; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { font: 14px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--text); display: flex; flex-direction: column; }
[hidden] { display: none !important; }

.bar { display: flex; align-items: center; gap: 16px; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 16px; }
.file-info { flex: 1; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.btn { font: inherit; border: 1px solid var(--line); background: var(--surface); color: var(--text); padding: 7px 12px; border-radius: 8px; cursor: pointer; transition: background .15s, border-color .15s; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.big { padding: 12px 22px; font-size: 16px; }
.btn.sm { padding: 3px 9px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .5; cursor: default; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.row .btn { flex: 1; }

.empty { flex: 1; display: grid; place-items: center; padding: 16px; }
.drop { text-align: center; max-width: 560px; width: 100%; padding: 48px 24px; border: 2px dashed var(--line); border-radius: 16px; background: var(--surface); transition: border-color .15s, background .15s; }
.drop.over { border-color: var(--accent); }
.drop h1 { margin: 0 0 8px; font-size: 32px; }
.drop p { color: var(--muted); margin: 0 0 24px; }
.drop .row { justify-content: center; }
.drop .row .btn { flex: 0 1 auto; }

.work { flex: 1; display: grid; grid-template-columns: 132px 1fr 300px; min-height: 0; }
.thumbs { overflow-y: auto; padding: 10px; border-right: 1px solid var(--line); background: var(--surface); }
.thumb { display: block; width: 100%; margin-bottom: 10px; padding: 4px; border: 2px solid transparent; border-radius: 8px; background: none; cursor: pointer; color: var(--muted); font: 12px system-ui; }
.thumb canvas { display: block; width: 100%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.2); }
.thumb.active { border-color: var(--accent); color: var(--text); }

.stage-wrap { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.stage-tools { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 6px; background: var(--surface); border-bottom: 1px solid var(--line); }
.stage-tools .sep { width: 1px; height: 18px; background: var(--line); margin: 0 6px; }
#zoomLabel, #pageLabel { min-width: 52px; text-align: center; font-variant-numeric: tabular-nums; }
.stage { flex: 1; overflow: auto; background: var(--stage); display: flex; padding: 24px; }
.page { position: relative; margin: auto; box-shadow: 0 4px 18px rgba(0,0,0,.25); background: #fff; flex: none; }
.page canvas { display: block; }
.overlay { position: absolute; inset: 0; overflow: hidden; touch-action: none; }
.crop { position: absolute; outline: 1px solid #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.6), 0 0 0 100000px var(--shade); cursor: move; will-change: transform; }
.crop:focus-visible { outline: 2px solid var(--accent); }
.grid { position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .15s;
  background:
    linear-gradient(to right, transparent calc(33.33% - .5px), rgba(255,255,255,.7) calc(33.33% - .5px), rgba(255,255,255,.7) calc(33.33% + .5px), transparent calc(33.33% + .5px), transparent calc(66.66% - .5px), rgba(255,255,255,.7) calc(66.66% - .5px), rgba(255,255,255,.7) calc(66.66% + .5px), transparent calc(66.66% + .5px)),
    linear-gradient(to bottom, transparent calc(33.33% - .5px), rgba(255,255,255,.7) calc(33.33% - .5px), rgba(255,255,255,.7) calc(33.33% + .5px), transparent calc(33.33% + .5px), transparent calc(66.66% - .5px), rgba(255,255,255,.7) calc(66.66% - .5px), rgba(255,255,255,.7) calc(66.66% + .5px), transparent calc(66.66% + .5px)); }
.crop.dragging .grid { opacity: 1; }
.h { position: absolute; width: 14px; height: 14px; background: #fff; border: 2px solid var(--accent); border-radius: 3px; margin: -7px 0 0 -7px; }
.h::after { content: ""; position: absolute; inset: -10px; } /* larger touch target */
.h.nw { left: 0; top: 0; cursor: nwse-resize; } .h.n { left: 50%; top: 0; cursor: ns-resize; }
.h.ne { left: 100%; top: 0; cursor: nesw-resize; } .h.e { left: 100%; top: 50%; cursor: ew-resize; }
.h.se { left: 100%; top: 100%; cursor: nwse-resize; } .h.s { left: 50%; top: 100%; cursor: ns-resize; }
.h.sw { left: 0; top: 100%; cursor: nesw-resize; } .h.w { left: 0; top: 50%; cursor: ew-resize; }
.dims { position: absolute; left: 50%; top: 8px; transform: translateX(-50%); background: rgba(0,0,0,.75); color: #fff; font: 12px/1 system-ui; padding: 5px 8px; border-radius: 6px; white-space: nowrap; pointer-events: none; font-variant-numeric: tabular-nums; }

.panel { overflow-y: auto; padding: 4px 16px 16px; background: var(--surface); border-left: 1px solid var(--line); }
.panel h3 { margin: 18px 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.field { display: block; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
.field select, .field input[type=text], .margins input { display: block; width: 100%; margin-top: 4px; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 7px; padding: 6px 8px; }
.field input[type=range] { width: 100%; }
.margins { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
.margins .lbl { grid-column: 1 / -1; }
.img-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
.hint { font-size: 12px; color: var(--muted); margin: 8px 0; }

.toast { position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%); background: #1d2130; color: #fff; padding: 10px 16px; border-radius: 8px; box-shadow: 0 6px 20px rgba(0,0,0,.3); z-index: 20; max-width: calc(100% - 32px); }
.busy { position: fixed; inset: 0; background: rgba(0,0,0,.35); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; color: #fff; z-index: 30; font-weight: 600; }
.spinner { width: 36px; height: 36px; border: 4px solid rgba(255,255,255,.3); border-top-color: #fff; border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Touch screens: bigger handles and buttons that are easy to hit with a finger. */
@media (pointer: coarse) {
  .h { width: 22px; height: 22px; margin: -11px 0 0 -11px; }
  .h::after { inset: -12px; }
  .btn { padding: 10px 14px; }
  .btn.sm { padding: 8px 14px; }
  .field select, .field input[type=text], .margins input { padding: 10px; font-size: 16px; } /* 16px stops iOS zoom-on-focus */
}
body { padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left); }

@media (max-width: 860px) {
  html, body { height: auto; min-height: 100%; }
  .work { display: flex; flex-direction: column; }
  .stage-wrap { height: 62vh; flex: none; }
  .panel { overflow: visible; }
  .thumbs { display: flex; gap: 8px; overflow-x: auto; overflow-y: hidden; border-right: 0; border-bottom: 1px solid var(--line); padding: 8px; }
  .thumb { width: 64px; flex: none; margin: 0; }
  .panel { border-left: 0; border-top: 1px solid var(--line); }
  .stage { padding: 16px; }
}