:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --surface: #ffffff;
  --surface-2: #eef3f4;
  --text: #182026;
  --muted: #64717b;
  --line: #dce4e7;
  --accent: #0b7f77;
  --accent-strong: #075f59;
  --danger: #b42318;
  --warning: #a15c07;
  --shadow: 0 14px 35px rgba(24, 32, 38, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

.app-shell {
  width: min(1440px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 6px 0 24px;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 28px;
  font-weight: 760;
  letter-spacing: 0;
}

h2 {
  font-size: 16px;
  font-weight: 720;
  letter-spacing: 0;
}

.topbar p,
.panel-heading p {
  color: var(--muted);
  margin-top: 4px;
}

.primary,
.secondary,
.tab {
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  min-height: 38px;
}

.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  padding: 0 18px;
  font-weight: 700;
}

.primary:hover {
  background: var(--accent-strong);
}

.primary:disabled {
  background: #b7c8c8;
  border-color: #b7c8c8;
  cursor: not-allowed;
}

.secondary,
.tab {
  background: #fff;
  color: var(--text);
  padding: 0 12px;
}

.secondary:hover,
.tab:hover {
  border-color: #aebdc2;
}

.upload-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.upload-panel,
.results {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.upload-panel {
  padding: 18px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  padding: 0 10px;
  white-space: nowrap;
}

.status-pill.ready {
  background: #dff5eb;
  color: #17613f;
}

.status-pill.error {
  background: #fde2df;
  color: var(--danger);
}

.dropzone {
  display: grid;
  place-items: center;
  min-height: 128px;
  margin-top: 16px;
  border: 1px dashed #9fb1b5;
  border-radius: 8px;
  background: #fbfcfc;
  color: var(--muted);
  cursor: pointer;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: #f0faf7;
}

.dropzone input {
  display: none;
}

.file-meta {
  min-height: 28px;
  color: var(--muted);
  margin: 12px 0 4px;
}

.mapping {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 12px;
  margin-top: 12px;
}

.field {
  display: grid;
  gap: 5px;
}

.field label {
  color: var(--muted);
  font-size: 12px;
}

.field.required label::after {
  content: " *";
  color: var(--danger);
}

.field select {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--text);
  padding: 0 10px;
}

.results {
  margin-top: 18px;
  padding: 18px;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(7, minmax(120px, 1fr));
  gap: 10px;
}

.metric {
  background: var(--surface-2);
  border-radius: 8px;
  padding: 12px;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.metric strong {
  display: block;
  font-size: 22px;
  margin-top: 2px;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.tab.active {
  background: #e0f4f1;
  border-color: #91cfc8;
  color: var(--accent-strong);
  font-weight: 700;
}

.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 16px 0 10px;
}

.export-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-width: 0;
}

.export-status {
  color: var(--muted);
  max-width: min(640px, 46vw);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  max-height: 62vh;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 900px;
  background: #fff;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 9px 10px;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
}

th {
  position: sticky;
  top: 0;
  background: #f8fafb;
  color: #35424a;
  z-index: 1;
}

td {
  color: #28343b;
}

.empty-state {
  padding: 26px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 980px) {
  .app-shell {
    width: min(100vw - 24px, 760px);
    padding-top: 18px;
  }

  .topbar,
  .table-toolbar,
  .export-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .export-status {
    max-width: 100%;
    white-space: normal;
  }

  .upload-grid,
  .mapping,
  .metrics {
    grid-template-columns: 1fr;
  }
}