:root {
  color-scheme: light;
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #eef4f4;
  --text: #172033;
  --muted: #647084;
  --border: #d8e0e7;
  --primary: #246b6b;
  --primary-hover: #1c5959;
  --accent: #3b78a8;
  --success: #247a4d;
  --warning: #a46314;
  --danger: #b42318;
  --focus: #1f7a8c;
  --radius: 8px;
  font-family: "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--focus) 72%, white);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  background: var(--primary);
  color: white;
  padding: 10px 14px;
  border-radius: var(--radius);
  z-index: 10;
}

.skip-link:focus {
  top: 12px;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 20px clamp(16px, 4vw, 36px);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 2;
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.35rem, 1.08rem + 1vw, 1.9rem);
  line-height: 1.2;
}

h2 {
  margin-bottom: 4px;
  font-size: 1.22rem;
}

h3 {
  margin-bottom: 10px;
  font-size: 1rem;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--primary);
  border-radius: 999px;
  padding: 7px 12px;
  font-weight: 700;
  white-space: nowrap;
}

.shell {
  display: grid;
  grid-template-columns: minmax(0, 450px) minmax(0, 1fr);
  gap: 18px;
  padding: 18px clamp(16px, 4vw, 36px) 36px;
}

.work-panel,
.results-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.work-panel {
  align-self: start;
  position: sticky;
  top: 96px;
}

.section-heading p,
.file-field small {
  color: var(--muted);
}

.form-grid {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.file-field {
  display: grid;
  gap: 7px;
  padding: 14px;
  border: 1px dashed #b5c4ce;
  border-radius: var(--radius);
  background: #fbfcfd;
  min-width: 0;
}

.file-field span,
.mode-field legend {
  font-weight: 700;
}

.file-field input {
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

.mode-field {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}

.mode-field label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.primary-button,
.download-area a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 0;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  padding: 11px 16px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.primary-button:hover,
.download-area a:hover {
  background: var(--primary-hover);
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.message {
  min-height: 24px;
  margin-top: 14px;
  font-weight: 700;
  color: var(--muted);
}

.message.error {
  color: var(--danger);
}

.message.success {
  color: var(--success);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 10px;
  margin: 14px 0 16px;
}

.summary-grid div {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  background: #fbfcfd;
}

.summary-grid span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.summary-grid strong {
  display: block;
  font-size: 1.35rem;
}

.download-area {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 16px;
}

.download-area a.secondary {
  background: #eaf1f7;
  color: var(--text);
  border: 1px solid var(--border);
}

.table-wrap {
  margin-top: 18px;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 680px;
  background: var(--surface);
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 10px;
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

th {
  background: #eef4f4;
  font-size: 0.9rem;
}

td {
  font-size: 0.92rem;
}

.badge {
  display: inline-flex;
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 0.82rem;
  font-weight: 700;
}

.badge.warning {
  color: #7a450f;
  background: #fff0d8;
}

.badge.info {
  color: #215a80;
  background: #e5f1fb;
}

@media (max-width: 920px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .work-panel {
    position: static;
  }

  .summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .app-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .shell {
    padding-inline: 12px;
  }

  .work-panel,
  .results-panel {
    padding: 14px;
  }

  .summary-grid {
    grid-template-columns: 1fr;
  }

  table {
    min-width: 560px;
  }
}