:root {
  --bg: #0e1116;
  --panel: #161b22;
  --border: #2a3038;
  --text: #e6edf3;
  --muted: #9aa4ad;
  --accent: #ffd24a;
  --accent-soft: #4a8fff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 24px 6px;
  border-bottom: 1px solid var(--border);
}

.header-text {
  min-width: 0;
  flex: 1;
}

.cdpp-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  opacity: 0.85;
  transition: opacity 120ms ease;
}

.cdpp-link:hover { opacity: 1; }

.cdpp-logo {
  height: 40px;
  width: auto;
  display: block;
}

header h1 {
  margin: 0 0 4px;
  font-size: 20px;
  letter-spacing: 0.2px;
}

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

.controls {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  margin: 0;
  background: var(--panel);
}

legend {
  padding: 0 6px;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

fieldset label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-right: 16px;
  cursor: pointer;
  font-size: 13px;
}

.sliders {
  flex: 1;
  min-width: 360px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 28px;
}

.slider-row {
  display: grid;
  grid-template-columns: 140px 1fr 48px;
  align-items: center;
  gap: 10px;
  padding: 2px 0;
}

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

.slider-row input[type="range"] {
  width: 100%;
  accent-color: var(--accent-soft);
}

.slider-row output {
  font-variant-numeric: tabular-nums;
  text-align: right;
  font-size: 13px;
}

.export {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

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

.export select,
.export button {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 10px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
}

.export button {
  background: var(--accent-soft);
  color: #0e1116;
  border-color: var(--accent-soft);
  font-weight: 600;
}

.export button:disabled {
  opacity: 0.5;
  cursor: wait;
}

.plots {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 12px 24px;
}

.plots-overlay {
  position: absolute;
  inset: 0;
  background: rgba(14, 17, 22, 0.78);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  animation: overlay-fade-in 120ms ease-out;
}
.plots-overlay[hidden] { display: none; }

.plots-overlay-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 22px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
}

.plots-overlay-msg {
  font-size: 14px;
  color: var(--text);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
}

.spinner {
  width: 22px;
  height: 22px;
  border: 3px solid #2a3038;
  border-top-color: var(--accent-soft);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes overlay-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.plot-container {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px 10px;
}

.plot-container h3 {
  margin: 4px 6px 6px;
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  font-weight: 600;
}

#plot-3d, #plot-2d {
  width: 100%;
  height: 520px;
}

footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
}

.status {
  padding: 4px 10px;
  border-radius: 4px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
}

.status-loading { background: #3a2a10; color: #ffd24a; }
.status-ready   { background: #102a1a; color: #6ce29a; }
.status-busy    { background: #102035; color: #6cb0ff; }
.status-error   { background: #3a1010; color: #ff8a8a; }

.links a {
  color: var(--accent-soft);
  text-decoration: none;
}
.links a:hover { text-decoration: underline; }

/* ── Magnetopause boundary panel ─────────────────────────── */
#mp-boundary-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 180px;
}

.mode-row {
  display: flex;
  gap: 14px;
}

.number-row {
  display: grid;
  grid-template-columns: 90px 80px;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
}

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

.number-row input[type="number"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 7px;
  font-size: 13px;
  font-family: inherit;
  width: 100%;
}

#params-panel > .mode-row,
#params-panel > #omni-ref-row,
#params-inputs {
  grid-column: 1 / -1;
}

#omni-ref-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: 6px;
  row-gap: 2px;
  padding: 2px 0;
}

#omni-ref-row label {
  color: var(--muted);
  font-size: 12px;
}

#omni-ref-row input[type="datetime-local"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 6px;
  font-size: 12px;
  font-family: inherit;
  min-width: 0;
  color-scheme: dark;
}

#omni-ref-fetch {
  background: var(--accent-soft);
  color: #0e1116;
  border: 1px solid var(--accent-soft);
  border-radius: 4px;
  padding: 3px 10px;
  font-size: 12px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

#omni-ref-fetch:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#omni-ref-status {
  grid-column: 1 / -1;
  font-size: 11px;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#omni-ref-status:empty { display: none; }

#params-inputs {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#params-inputs input:disabled,
#params-inputs output.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── Spacecraft crossings panel ──────────────────────────── */
#sc-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 260px;
}

#sc-select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
  font-family: inherit;
  width: 100%;
  cursor: pointer;
}

.date-row {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr;
  align-items: center;
  gap: 6px;
}

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

.date-row input[type="datetime-local"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 6px;
  font-size: 12px;
  font-family: inherit;
  width: 100%;
  color-scheme: dark;
}

.sc-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

#sc-load {
  background: var(--accent-soft);
  color: #0e1116;
  border: 1px solid var(--accent-soft);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 13px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

#sc-load:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#crossing-nav {
  display: flex;
  flex-direction: column;
}

#crossing-select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 13px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  width: 100%;
  cursor: pointer;
}

#sc-status {
  font-size: 12px;
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

@media (max-width: 920px) {
  .plots { grid-template-columns: 1fr; }
  .sliders { grid-template-columns: 1fr; }
  .date-row { grid-template-columns: auto 1fr; }
}