/* Nunito (SIL Open Font License, see fonts/OFL.txt), self-hosted variable font. */
@font-face {
  font-family: "Nunito";
  src: url("fonts/nunito-latin-wght-normal.woff2") format("woff2");
  font-weight: 200 1000;
  font-style: normal;
  font-display: swap;
}

:root {
  --accent: #006aff;
  --accent-dark: #0055cc;
  --accent-soft: #eef4ff;
  --text: #1c1f24;
  --muted: #6b7280;
  --line: #e7e9ee;
  --bg: #f4f5f8;
  --ok: #1f9d55;
  --ok-soft: #ecf8f1;
  --warn-soft: #fff6dd;
  --err: #d93025;
  --err-soft: #fdeceb;
  --radius: 14px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font: 15px/1.55 "Nunito", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button, input, select { font: inherit; }

header, .steps, main, footer { max-width: 920px; margin-inline: auto; }

header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 40px;
  padding: 0 20px;
}
.logo { width: 44px; height: 44px; border-radius: 10px; }
h1 { margin: 0; font-size: 24px; font-weight: 800; letter-spacing: -0.01em; }

/* Stepper */
.steps {
  display: flex;
  gap: 8px;
  margin-block: 24px 16px;
  padding: 0 20px;
  list-style: none;
}
.steps li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 6px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
}
.steps .num {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #e3e6ec;
  font-size: 13px;
  font-weight: 800;
}
.steps .active { background: #fff; color: var(--text); box-shadow: 0 1px 3px rgba(16, 24, 40, 0.08); }
.steps .active .num { background: var(--accent); color: #fff; }
.steps .done { color: var(--ok); }
.steps .done .num { background: var(--ok); color: #fff; }

/* Card */
main {
  padding: 28px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
}
main p { margin-top: 0; }

/* Upload */
.drop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 56px 16px;
  border: 2px dashed #cfd5df;
  border-radius: var(--radius);
  background: #fafbfc;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop-icon { width: 40px; height: 40px; margin-bottom: 8px; color: var(--accent); }
.drop strong { color: var(--text); font-size: 17px; font-weight: 700; }

/* Working indicator. Animates with transform only, so the browser keeps it moving
   even while the page is busy reading or writing the spreadsheet. */
.progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 72px 16px;
  color: var(--muted);
  font-weight: 600;
}
.progress.compact { padding: 20px 0 0; gap: 10px; font-size: 14px; }
.progress .bar {
  position: relative;
  width: min(360px, 80%);
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: #e3e8f0;
}
.progress .bar div {
  position: absolute;
  inset: 0;
  width: 40%;
  border-radius: inherit;
  background: var(--accent);
  animation: progress-slide 1.1s ease-in-out infinite;
  will-change: transform;
}
.progress.compact .bar { width: 220px; }
.progress.compact .bar div { background: var(--ok); }
@keyframes progress-slide {
  from { transform: translateX(-100%); }
  to { transform: translateX(250%); }
}

.error {
  margin: 16px 0 0;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--err-soft);
  color: var(--err);
}
.success {
  padding: 12px 16px;
  border-radius: 10px;
  background: var(--ok-soft);
  color: #146c3b;
}

/* Conflict / blank-SKU boxes */
.group {
  margin: 16px 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow-x: auto;
  transition: border-color 0.15s;
}
.group.resolved { border-color: #a8dcbc; }
.group h3 { margin: 0; padding: 12px 16px 4px; font-size: 15px; font-weight: 800; }
.group .note { margin: 0; padding: 0 16px 8px; color: var(--muted); font-size: 13px; }

table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { padding: 9px 16px; text-align: left; white-space: nowrap; }
th {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
td { border-top: 1px solid var(--line); }
tbody tr { transition: background 0.1s; }
tbody tr:hover { background: #f8f9fb; }
tr label { cursor: pointer; }
td.diff { background: var(--warn-soft); }
tr.kept, tr.kept:hover { background: var(--ok-soft); }
tr.kept td.diff { background: #e3f3d6; }
input[type="radio"] { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; }

.sku-input {
  width: 150px;
  padding: 7px 10px;
  border: 1px solid #d5dae2;
  border-radius: 8px;
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.sku-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(0, 106, 255, 0.15); }
.sku-input.invalid { border-color: var(--err); background: var(--err-soft); }

/* Buttons */
.actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; }

button {
  padding: 10px 20px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
}
button:hover:not(:disabled) { background: var(--accent-dark); }
button:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(0, 106, 255, 0.3); }
button:disabled { background: #c9d3e3; cursor: not-allowed; }
button.secondary { background: #eef0f4; color: var(--text); }
button.secondary:hover { background: #e2e5eb; }

/* Split download button: main action + format arrow, separated by a thin gap. */
.split { position: relative; display: flex; justify-content: center; gap: 2px; margin-top: 28px; }
button.green { background: var(--ok); padding: 12px 26px; font-size: 16px; }
button.green:hover:not(:disabled) { background: #178246; }
button.green:focus-visible { box-shadow: 0 0 0 3px rgba(31, 157, 85, 0.3); }
#download-btn { border-radius: 10px 0 0 10px; }
#format-toggle { display: grid; place-items: center; padding: 0 12px; border-radius: 0 10px 10px 0; }
#format-toggle svg { width: 14px; height: 14px; transition: transform 0.15s; }
#format-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }

.menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  min-width: 220px;
  padding: 6px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(16, 24, 40, 0.12);
}
.menu button {
  display: block;
  width: 100%;
  padding: 8px 12px 8px 32px;
  background: transparent;
  color: var(--text);
  font-weight: 600;
  text-align: left;
  border-radius: 8px;
  position: relative;
}
.menu button:hover:not(:disabled) { background: #f2f4f7; }
.menu button[aria-checked="true"]::before {
  content: "✓";
  position: absolute;
  left: 12px;
  color: var(--ok);
}

.success ul { margin: 6px 0 0; padding-left: 20px; }
.success li { margin: 2px 0; }

footer { margin-block: 20px 48px; padding: 0 20px; color: var(--muted); font-size: 13px; text-align: center; }

@media (max-width: 600px) {
  header { margin-top: 24px; }
  .steps li { padding-right: 8px; font-size: 13px; }
  main { padding: 20px; border-radius: 0; }
}