:root {
  --bg: #f4f4f5;
  --panel: #ffffff;
  --panel-2: #f8f8f9;
  --text: #18181b;
  --muted: #6b6b76;
  --border: #e3e3e8;
  --border-strong: #cfcfd6;
  --accent: #d6453d;
  --accent-hover: #bf3b34;
  --accent-soft: #fdecea;
  --accent-text: #ffffff;
  --canvas-bg: #e6e6ea;
  --select: #2563eb;
  --danger: #c0352e;
  --shadow: 0 1px 2px rgb(0 0 0 / .06), 0 4px 16px rgb(0 0 0 / .06);
  --page-shadow: 0 1px 3px rgb(0 0 0 / .12), 0 8px 24px rgb(0 0 0 / .08);
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121215; --panel: #1b1b1f; --panel-2: #222227; --text: #ececf1; --muted: #9d9daa;
    --border: #2e2e35; --border-strong: #3d3d46; --accent: #e5554c; --accent-hover: #f06a61;
    --accent-soft: #3a1f1d; --canvas-bg: #0d0d10; --select: #4f8bff; --danger: #f06a61;
    --shadow: 0 1px 2px rgb(0 0 0 / .4), 0 4px 16px rgb(0 0 0 / .3);
    --page-shadow: 0 2px 10px rgb(0 0 0 / .6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121215; --panel: #1b1b1f; --panel-2: #222227; --text: #ececf1; --muted: #9d9daa;
  --border: #2e2e35; --border-strong: #3d3d46; --accent: #e5554c; --accent-hover: #f06a61;
  --accent-soft: #3a1f1d; --canvas-bg: #0d0d10; --select: #4f8bff; --danger: #f06a61;
  --shadow: 0 1px 2px rgb(0 0 0 / .4), 0 4px 16px rgb(0 0 0 / .3);
  --page-shadow: 0 2px 10px rgb(0 0 0 / .6);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
[hidden] { display: none !important; }
button, input, select { font: inherit; color: inherit; }
svg.ic { width: 18px; height: 18px; flex: none; }

/* ---------- Header ---------- */
.app-header {
  display: flex; align-items: center; gap: 16px;
  height: 56px; padding: 0 16px; flex: none;
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 16px; }
.tabs { display: flex; gap: 4px; margin-left: 12px; }
.tab {
  display: flex; align-items: center; gap: 8px; padding: 7px 14px;
  border: 0; border-radius: 8px; background: transparent; color: var(--muted); cursor: pointer; font-weight: 550;
}
.tab:hover { background: var(--panel-2); color: var(--text); }
.tab.active { background: var(--accent-soft); color: var(--accent); }
.header-note { margin-left: auto; color: var(--muted); font-size: 12.5px; }

.view { flex: 1; min-height: 0; display: flex; flex-direction: column; }

/* ---------- Buttons & fields ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 34px; padding: 0 12px; border-radius: 8px; white-space: nowrap;
  border: 1px solid var(--border); background: var(--panel); cursor: pointer; font-weight: 520;
  transition: background .12s, border-color .12s;
}
.btn:hover { background: var(--panel-2); border-color: var(--border-strong); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.icon { width: 34px; padding: 0; }
.btn.small { height: 30px; padding: 0 10px; font-size: 13px; }
.btn.small svg.ic { width: 15px; height: 15px; }
.btn.danger { color: var(--danger); }
.btn.tool.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.field { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
.field input[type="text"], .field input[type="number"], select {
  height: 30px; padding: 0 8px; border: 1px solid var(--border); border-radius: 7px; background: var(--panel); color: var(--text);
}
.field input[type="number"] { width: 64px; }
input[type="color"] { width: 34px; height: 30px; padding: 2px; border: 1px solid var(--border); border-radius: 7px; background: var(--panel); cursor: pointer; }
input[type="range"] { accent-color: var(--accent); width: 110px; }
.check { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }

/* ---------- Dropzones ---------- */
.dropzone {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px; text-align: center;
  padding: 48px 24px; border: 2px dashed var(--border-strong); border-radius: 16px; background: var(--panel);
  cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.over { border-color: var(--accent); background: var(--accent-soft); }
.dropzone strong { font-size: 17px; }
.dropzone span { color: var(--muted); }
.dropzone .btn { margin-top: 12px; color: var(--accent-text); }
svg.dz-icon { width: 40px; height: 40px; color: var(--accent); stroke-width: 1.6; }
.dropzone.compact { padding: 26px 20px; flex-direction: row; gap: 14px; text-align: left; flex-wrap: wrap; }
.dropzone.compact svg.dz-icon { width: 28px; height: 28px; }
.dropzone.compact strong { font-size: 15px; }
.dropzone.mini { padding: 20px; }
.dropzone.mini strong { font-size: 14px; }

.empty-state { max-width: 640px; width: 100%; margin: auto; padding: 24px 16px; overflow: auto; }
.feature-list {
  list-style: none; padding: 0; margin: 22px 0 0; display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: center; color: var(--muted);
}
.feature-list li { display: flex; align-items: center; gap: 7px; }
.feature-list svg.ic { width: 16px; height: 16px; color: var(--accent); }

/* ---------- Editor ---------- */
.editor { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.toolbar {
  display: flex; align-items: center; gap: 10px; padding: 8px 12px; flex: none;
  background: var(--panel); border-bottom: 1px solid var(--border); overflow-x: auto; scrollbar-width: thin;
}
.toolbar .group { display: flex; align-items: center; gap: 6px; padding-right: 10px; border-right: 1px solid var(--border); }
.toolbar .group:last-child { border-right: 0; }
.toolbar .group.end { margin-left: auto; padding-right: 0; }
.zoom-label { min-width: 62px; font-variant-numeric: tabular-nums; }
.props {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap; min-height: 46px; padding: 7px 12px; flex: none;
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.props .tip { color: var(--muted); font-size: 13px; }
.prop-group { display: flex; align-items: center; gap: 8px; }

.page-scroll { flex: 1; min-height: 0; overflow: auto; background: var(--canvas-bg); position: relative; }
.page-scroll.over { outline: 3px dashed var(--accent); outline-offset: -8px; }
.pages { display: flex; flex-direction: column; align-items: center; gap: 22px; padding: 22px 16px 60px; width: max-content; min-width: 100%; }
.page-card { display: flex; flex-direction: column; gap: 6px; }
.page-bar { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 12.5px; }
.page-actions { display: flex; gap: 2px; }
.page-actions button {
  width: 28px; height: 28px; display: grid; place-items: center; border: 0; border-radius: 6px; background: transparent; color: var(--muted); cursor: pointer;
}
.page-actions button:hover:not(:disabled) { background: var(--panel); color: var(--text); }
.page-actions button:disabled { opacity: .3; cursor: default; }
.page-actions button.del:hover:not(:disabled) { color: var(--danger); }
.page-actions svg.ic { width: 16px; height: 16px; }
.page-surface { position: relative; background: #fff; box-shadow: var(--page-shadow); }
.page-surface canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.overlay { position: absolute; inset: 0; overflow: hidden; }
body:not([data-tool="select"]) .overlay { cursor: crosshair; touch-action: none; }
body[data-tool="text"] .overlay { cursor: text; }
body[data-tool="edittext"] .overlay { cursor: default; touch-action: auto; }

/* Edit existing text: clickable boxes over each line, and boxes hiding replaced text */
.hit-layer { position: absolute; inset: 0; z-index: 1; pointer-events: none; }
body:not([data-tool="edittext"]) .hit-layer { display: none; }
.text-hit {
  position: absolute; pointer-events: auto; cursor: text; border-radius: 2px;
  outline: 1px dashed rgb(37 99 235 / .35); background: rgb(37 99 235 / .05);
}
.text-hit:hover { outline: 1.5px solid var(--select); background: rgb(37 99 235 / .12); }
.text-cover { position: absolute; z-index: 0; pointer-events: none; }
.overlay .item { z-index: 2; }
.btn.toggle { font-family: Georgia, "Times New Roman", serif; font-size: 15px; }
.btn.toggle.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

/* Items placed on pages */
.item { position: absolute; touch-action: none; cursor: move; user-select: none; }
.item::after { content: ""; position: absolute; inset: -3px; border: 1px solid transparent; border-radius: 2px; pointer-events: none; }
.item:hover::after { border-color: color-mix(in srgb, var(--select) 55%, transparent); }
.item.selected::after { border: 1.5px solid var(--select); }
.item img { width: 100%; height: 100%; display: block; pointer-events: none; }
.item-text .text-content {
  white-space: pre; line-height: 1.2; outline: none; min-width: 4px; min-height: 1em; color: #111;
}
.item-text .text-content[contenteditable="plaintext-only"], .item-text .text-content[contenteditable="true"] { cursor: text; user-select: text; }
.item-rect.whiteout:not(.selected)::after { border: 1px dashed rgb(0 0 0 / .18); }
.handle {
  position: absolute; right: -8px; bottom: -8px; width: 13px; height: 13px; border-radius: 3px;
  background: #fff; border: 1.5px solid var(--select); cursor: nwse-resize; display: none; z-index: 2;
}
.item-del {
  position: absolute; top: -12px; right: -12px; width: 22px; height: 22px; border-radius: 50%;
  border: 0; background: var(--select); color: #fff; font-size: 15px; line-height: 1; cursor: pointer; display: none; z-index: 2;
}
.item.selected .handle, .item.selected .item-del { display: block; }
.item.editing .handle { display: none; }

/* ---------- Merge ---------- */
.merge { width: 100%; max-width: 900px; margin: 0 auto; padding: 28px 16px 40px; overflow: auto; flex: 1; display: flex; flex-direction: column; gap: 16px; }
.merge-head h1 { margin: 0 0 4px; font-size: 22px; }
.merge-head p { margin: 0; color: var(--muted); }
.merge-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.merge-row {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px; background: var(--panel);
  border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.merge-row.dragging { opacity: .4; }
.merge-row.drop-before { box-shadow: 0 -3px 0 var(--accent); }
.merge-row.drop-after { box-shadow: 0 3px 0 var(--accent); }
.merge-row .grip { color: var(--muted); cursor: grab; display: grid; place-items: center; }
.merge-row .idx { width: 22px; text-align: center; color: var(--muted); font-variant-numeric: tabular-nums; }
.merge-row .thumb { width: 44px; height: 56px; object-fit: contain; background: #fff; border: 1px solid var(--border); border-radius: 4px; flex: none; }
.merge-row .meta { flex: 1; min-width: 0; }
.merge-row .fname { font-weight: 560; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.merge-row .sub { color: var(--muted); font-size: 12.5px; }
.merge-row .range input { width: 150px; }
.merge-row .range input.invalid { border-color: var(--danger); background: var(--accent-soft); }
.merge-row .row-actions { display: flex; gap: 2px; }
.merge-row .row-actions button { width: 30px; height: 30px; display: grid; place-items: center; border: 0; border-radius: 6px; background: transparent; color: var(--muted); cursor: pointer; }
.merge-row .row-actions button:hover:not(:disabled) { background: var(--panel-2); color: var(--text); }
.merge-row .row-actions button:disabled { opacity: .3; cursor: default; }
.merge-foot {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 12px; position: sticky; bottom: 0;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.merge-total { color: var(--muted); margin-right: auto; }
.field.name input { width: 160px; }

/* ---------- Signature dialog ---------- */
.dialog {
  width: min(640px, calc(100vw - 32px)); max-height: calc(100vh - 32px); padding: 0; border: 1px solid var(--border);
  border-radius: 14px; background: var(--panel); color: var(--text); box-shadow: 0 20px 60px rgb(0 0 0 / .3); overflow: auto;
}
.dialog::backdrop { background: rgb(10 10 14 / .45); }
.dialog-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px 6px; }
.dialog-head h2 { margin: 0; font-size: 17px; }
.dialog-head .btn { border: 0; }
.saved-wrap { padding: 4px 16px 10px; }
.caption { color: var(--muted); font-size: 12.5px; margin-bottom: 6px; }
.saved-sigs { display: flex; gap: 8px; flex-wrap: wrap; }
.saved-sig { position: relative; width: 120px; height: 54px; border: 1px solid var(--border); border-radius: 8px; background: #fff; cursor: pointer; padding: 4px; }
.saved-sig:hover { border-color: var(--accent); }
.saved-sig img { width: 100%; height: 100%; object-fit: contain; }
.saved-sig .rm { position: absolute; top: -8px; right: -8px; width: 20px; height: 20px; border-radius: 50%; border: 0; background: var(--muted); color: #fff; cursor: pointer; font-size: 13px; line-height: 1; display: none; }
.saved-sig:hover .rm { display: block; }
.seg { display: flex; margin: 4px 16px 12px; padding: 3px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 9px; }
.seg-btn { flex: 1; height: 32px; border: 0; border-radius: 7px; background: transparent; cursor: pointer; font-weight: 540; color: var(--muted); }
.seg-btn.active { background: var(--panel); color: var(--text); box-shadow: var(--shadow); }
.pane { padding: 0 16px; display: flex; flex-direction: column; gap: 10px; }
.pane-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.sig-pad {
  width: 100%; height: 200px; border: 1px solid var(--border-strong); border-radius: 10px; touch-action: none; cursor: crosshair;
  background: #fff linear-gradient(transparent calc(100% - 52px), #e6e6ea calc(100% - 52px), #e6e6ea calc(100% - 51px), transparent calc(100% - 51px));
}
.swatches { display: flex; gap: 6px; }
.swatch { width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--panel); background: var(--c); box-shadow: 0 0 0 1px var(--border-strong); cursor: pointer; }
.swatch.active { box-shadow: 0 0 0 2px var(--accent); }
.sig-text { height: 44px; padding: 0 12px; font-size: 16px; border: 1px solid var(--border-strong); border-radius: 9px; background: var(--panel); }
.font-choices { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.font-choice { height: 70px; font-size: 32px; border: 1px solid var(--border); border-radius: 10px; background: #fff; color: #0b1f66; cursor: pointer; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; padding: 0 10px; }
.font-choice.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.sig-upload {
  max-width: 100%; max-height: 180px; align-self: center; border-radius: 8px; border: 1px solid var(--border);
  background: repeating-conic-gradient(#e9e9ee 0 25%, #fff 0 50%) 0 0 / 16px 16px;
}
.dialog-foot { display: flex; align-items: center; gap: 8px; padding: 16px; flex-wrap: wrap; }
.dialog-foot .spacer { flex: 1; }

/* ---------- Busy & toasts ---------- */
.busy { position: fixed; inset: 0; z-index: 50; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; background: rgb(10 10 14 / .35); color: #fff; font-weight: 550; }
.spinner { width: 38px; height: 38px; border-radius: 50%; border: 3px solid rgb(255 255 255 / .35); border-top-color: #fff; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.toasts { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 60; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; width: calc(100% - 32px); }
.toast { max-width: 520px; padding: 10px 16px; border-radius: 9px; background: #26262c; color: #fff; box-shadow: var(--shadow); transition: opacity .3s, transform .3s; }
.toast.error { background: #a92c25; }
.toast.success { background: #1f7a45; }
.toast.out { opacity: 0; transform: translateY(8px); }

/* ---------- Small screens ---------- */
@media (max-width: 900px) {
  .toolbar .lbl { display: none; }
  .toolbar .btn:not(.primary) { width: 34px; padding: 0; }
  .toolbar .btn.zoom-label { width: auto; padding: 0 8px; }
}
@media (max-width: 640px) {
  .header-note { display: none; }
  .tabs { margin-left: auto; }
  .tab span { display: none; }
  .brand span { font-size: 15px; }
  .merge-row { flex-wrap: wrap; }
  .merge-row .meta { flex-basis: calc(100% - 160px); }
  .merge-row .range { flex: 1; }
  .merge-row .range input { width: 100%; }
  .font-choices { grid-template-columns: 1fr; }
  .toolbar .btn.primary span { display: none; }
  .toolbar .btn.primary { width: 34px; padding: 0; }
}