:root {
  --paper: #f7f6f2;
  --panel: #ffffff;
  --ink: #1b2430;
  --muted: #5b6672;
  --line: #dcd8ce;
  --line-strong: #c7c2b6;
  --accent: #2b54e0;      /* auto-detected fields */
  --accent-soft: #e8edfd;
  --manual: #c9832b;      /* manually added fields */
  --manual-soft: #f6ecdb;
  --danger: #c0392b;
  --ok: #2e7d5b;
  --radius: 10px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
}

a { color: var(--accent); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- buttons --- */
button, .btn {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid var(--line-strong);
  background: var(--panel);
  color: var(--ink);
  padding: 9px 14px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.05s ease;
}
button:hover, .btn:hover { border-color: var(--ink); }
button:active { transform: translateY(1px); }
button:focus-visible, a:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
button:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}
.btn-primary:hover { background: #0f1721; }
.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-accent:hover { background: #1e42c4; border-color: #1e42c4; }
.btn-ghost { background: transparent; border-color: transparent; }
.btn-ghost:hover { background: rgba(0,0,0,0.05); border-color: transparent; }
.btn-danger { color: var(--danger); border-color: var(--line-strong); }
.btn-danger:hover { border-color: var(--danger); }
.btn.active { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }

/* --- auth --- */
.auth-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 1px 2px rgba(20,30,40,0.04), 0 8px 30px rgba(20,30,40,0.05);
}
.brand {
  font-weight: 800;
  letter-spacing: -0.02em;
  font-size: 22px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.brand .mark {
  width: 22px; height: 22px;
  border: 2px solid var(--ink);
  border-radius: 4px;
  position: relative;
}
.brand .mark::after {
  content: "";
  position: absolute;
  left: 3px; right: 3px; bottom: 4px;
  height: 2px; background: var(--accent);
}
.auth-card h1 { font-size: 20px; margin: 20px 0 4px; letter-spacing: -0.01em; }
.auth-card p.sub { color: var(--muted); margin: 0 0 22px; font-size: 14px; }
.field { margin-bottom: 14px; }
.field label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.field input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-size: 15px;
  background: #fff;
  color: var(--ink);
}
.auth-card .btn-primary { width: 100%; margin-top: 6px; }
.auth-alt { margin-top: 18px; font-size: 14px; color: var(--muted); text-align: center; }
.notice {
  font-size: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 14px;
  display: none;
}
.notice.error { display: block; background: #fbeae8; color: var(--danger); }

/* --- app shell --- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar .user { display: flex; align-items: center; gap: 14px; font-size: 14px; color: var(--muted); }

.layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0;
  min-height: calc(100vh - 57px);
}
.stage {
  padding: 22px;
  overflow: auto;
}
.side {
  border-left: 1px solid var(--line);
  background: var(--panel);
  padding: 20px;
  position: sticky;
  top: 57px;
  height: calc(100vh - 57px);
  overflow: auto;
}

/* --- upload --- */
.dropzone {
  max-width: 720px;
  margin: 40px auto;
  border: 2px dashed var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 56px 32px;
  text-align: center;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.dropzone.drag { border-color: var(--accent); background: var(--accent-soft); }
.dropzone h2 { margin: 14px 0 6px; letter-spacing: -0.01em; }
.dropzone p { color: var(--muted); margin: 0 0 20px; }
.dropzone .formats { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-top: 18px; }
.checkline { display: inline-flex; gap: 8px; align-items: center; margin-top: 16px; font-size: 14px; color: var(--muted); }

/* --- workspace --- */
.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.toolbar .spacer { flex: 1; }
.page-indicator { font-family: var(--mono); font-size: 13px; color: var(--muted); padding: 0 6px; }

.canvas-frame {
  display: inline-block;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  padding: 10px;
  box-shadow: 0 8px 30px rgba(20,30,40,0.06);
}
#editor { display: block; cursor: crosshair; touch-action: none; }

.side h3 {
  font-size: 13px;
  font-family: var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}
.side .divider { height: 1px; background: var(--line); margin: 20px 0; }

.legend { display: flex; flex-direction: column; gap: 8px; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.legend .swatch { display: inline-block; width: 14px; height: 14px; border-radius: 3px; margin-right: 8px; vertical-align: -2px; }
.legend .swatch.auto { background: var(--accent-soft); border: 1.5px solid var(--accent); }
.legend .swatch.manual { background: var(--manual-soft); border: 1.5px solid var(--manual); }

.selected-box { font-size: 14px; }
.selected-box .empty { color: var(--muted); font-style: italic; }
.count-pill {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 20px;
}

.export-actions { display: flex; flex-direction: column; gap: 10px; }
.export-actions button { width: 100%; }

.fill-panel { display: none; margin-top: 8px; }
.fill-panel.open { display: block; }
.fill-row { margin-bottom: 12px; }
.fill-row label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 5px;
}
.fill-row input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  font-size: 14px;
}
.flatten-line { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); margin: 10px 0; }

.processing {
  max-width: 720px;
  margin: 60px auto;
  text-align: center;
  color: var(--muted);
}
.spinner {
  width: 34px; height: 34px;
  border: 3px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 18px;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed;
  bottom: 22px; left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: #fff;
  padding: 11px 18px;
  border-radius: 9px;
  font-size: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 50;
}
.toast.show { opacity: 1; }
.toast.err { background: var(--danger); }

.hidden { display: none !important; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .side { position: static; height: auto; border-left: none; border-top: 1px solid var(--line); }
}
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}