:root {
  color-scheme: light;
  --bg: #f6f4ef;
  --surface: #ffffff;
  --ink: #22262a;
  --muted: #68707a;
  --line: #d8d3c8;
  --accent: #176b63;
  --accent-strong: #0d4f49;
  --warning: #8a4a13;
  --warning-bg: #fff5e5;
  --shadow: 0 10px 28px rgba(34, 38, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", sans-serif;
  line-height: 1.55;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink);
  padding: 8px 12px;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

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

.app-header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: center;
  padding: 28px clamp(18px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
  background: #fbfaf7;
}

.app-header h1 {
  margin: 2px 0 0;
  font-size: clamp(24px, 4vw, 36px);
  letter-spacing: 0;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.source-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 420px) minmax(0, 1fr);
  gap: 18px;
  padding: 22px clamp(18px, 4vw, 44px) 42px;
}

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

.panel {
  padding: 18px;
}

.controls,
.source-panel,
.data-panel,
.warnings-panel {
  grid-column: 1;
}

.outputs {
  grid-column: 2;
  grid-row: 1 / span 3;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

h2 {
  margin: 0 0 14px;
  font-size: 17px;
  letter-spacing: 0;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 700;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
}

input,
select {
  min-height: 40px;
  padding: 8px 10px;
}

textarea {
  min-height: 230px;
  padding: 12px;
  resize: vertical;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
  white-space: pre;
}

.note {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.section-title,
.output-header,
.import-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.section-title h2,
.output-header h2,
.import-row p {
  margin: 0;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin: 16px 0 12px;
}

.tab {
  padding: 8px 4px;
  font-size: 13px;
}

.tab.active {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 700;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: grid;
  gap: 10px;
}

.file-button {
  display: inline-flex;
  width: fit-content;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  background: #fff;
}

.file-button input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.import-row p,
code {
  color: var(--muted);
  font-size: 12px;
}

.warnings-list {
  margin: 0;
  padding-left: 18px;
  color: var(--warning);
}

.warnings-list li {
  margin: 4px 0;
}

.warnings-list.ok {
  color: var(--accent-strong);
}

.output-card {
  min-width: 0;
  padding: 14px;
}

.output-card.wide {
  grid-column: 1 / -1;
}

.output-header {
  margin-bottom: 10px;
}

.output-header div {
  display: flex;
  gap: 8px;
}

.output-card textarea {
  min-height: 310px;
}

.output-card.wide textarea {
  min-height: 370px;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .controls,
  .source-panel,
  .data-panel,
  .warnings-panel,
  .outputs {
    grid-column: 1;
  }

  .outputs {
    grid-row: auto;
  }
}

@media (max-width: 680px) {
  .app-header,
  .section-title,
  .output-header,
  .import-row {
    align-items: stretch;
    flex-direction: column;
  }

  .header-actions,
  .output-header div {
    justify-content: stretch;
  }

  .header-actions button,
  .output-header button {
    flex: 1;
  }

  .outputs,
  .field-grid,
  .source-actions {
    grid-template-columns: 1fr;
  }

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