:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --border: #dde1e6;
  --text: #1c2128;
  --text-muted: #57606a;
  --accent: #1f6feb;
  --accent-contrast: #ffffff;
  --green: #1a7f37;
  --amber: #9a6700;
  --red: #cf222e;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 1px 8px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161b22;
    --border: #30363d;
    --text: #e6edf3;
    --text-muted: #9198a1;
    --accent: #4493f8;
    --accent-contrast: #0d1117;
    --green: #3fb950;
    --amber: #d29922;
    --red: #f85149;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 1px 8px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

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

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  padding: 20px 0;
}

.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.brand-mark { font-size: 2rem; line-height: 1; }

.brand h1 { margin: 0 0 4px; font-size: 1.4rem; }

.tagline { margin: 0; color: var(--text-muted); max-width: 640px; font-size: 0.95rem; }

.gh-link {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 14px;
  text-decoration: none;
  font-size: 0.9rem;
  white-space: nowrap;
}

main.wrap { padding-top: 24px; padding-bottom: 60px; }

.info-banner {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 28px;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 22px;
}

.step-head {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 16px;
}

.step-num {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-contrast);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.step-head h2 { margin: 0 0 4px; font-size: 1.15rem; }
.step-head p { margin: 0; color: var(--text-muted); font-size: 0.92rem; }

.aoi-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.btn-group { display: flex; gap: 8px; }

.btn {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.88rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

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

.btn-ghost { background: transparent; }

.btn-upload { background: var(--bg); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
  font-size: 0.95rem;
  padding: 10px 20px;
}

.btn-primary.active {
  outline: 2px solid var(--accent);
}

.basemap-select, .toggle {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.map {
  height: 480px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.aoi-summary {
  margin-top: 10px;
  display: flex;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.hidden { display: none !important; }

.error {
  margin-top: 10px;
  color: var(--red);
  font-size: 0.88rem;
}

.warning {
  margin-bottom: 10px;
  color: var(--amber);
  font-size: 0.88rem;
}

.placeholder {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 12px 0;
}

.dataset-mode-toggle {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.88rem;
  margin-bottom: 12px;
  color: var(--text-muted);
}

.dataset-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dataset-list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  flex-wrap: wrap;
}

.dataset-list li.selected { border-color: var(--accent); background: rgba(31, 111, 235, 0.06); }

.dataset-name { font-weight: 600; }
.dataset-meta { color: var(--text-muted); font-size: 0.82rem; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.product-card {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 14px 14px 40px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.product-card input {
  position: absolute;
  left: 14px;
  top: 16px;
}

.product-card:has(input:checked) {
  border-color: var(--accent);
  background: rgba(31, 111, 235, 0.06);
}

.product-title { font-weight: 600; font-size: 0.94rem; }
.product-desc { color: var(--text-muted); font-size: 0.82rem; }

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 8px;
}

.option { display: flex; flex-direction: column; gap: 6px; font-size: 0.88rem; }
.option label { font-weight: 600; }
.option input, .option select {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 9px;
  background: var(--bg);
  color: var(--text);
  font-size: 0.88rem;
}

.option.checkboxes { justify-content: center; gap: 8px; font-weight: 400; }
.option.checkboxes label { font-weight: 400; display: flex; align-items: center; gap: 8px; }

.input-with-unit { display: flex; gap: 6px; }
.input-with-unit input { flex: 1; min-width: 0; }
.input-with-unit select { flex: 0 0 auto; }

.hint { color: var(--text-muted); font-size: 0.78rem; }

.advanced { margin: 16px 0; font-size: 0.88rem; }
.advanced summary { cursor: pointer; font-weight: 600; }
.advanced .options-grid { margin-top: 12px; }

.roadmap-note {
  margin-top: 18px;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px dashed var(--border);
  padding-top: 12px;
}

.config-preview {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-size: 0.8rem;
  overflow-x: auto;
  max-height: 320px;
}

.run-steps { padding-left: 20px; font-size: 0.92rem; }
.run-steps li { margin-bottom: 14px; }
.run-steps pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  overflow-x: auto;
  margin-top: 6px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0 40px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.85em;
}