:root {
  --paper: #f3efe6;
  --ink: #1d1a16;
  --muted: #5e584f;
  --line: #ddd4c4;
  --card: #fffcf7;
  --accent: #0e4d6c;
  --accent-ink: #f7f4ee;
  --sim: #8c2f14;
  --sim-bg: #f3d2c4;
  --measured: #1f4d3a;
  --measured-bg: #d5e6db;
  --liftoff: #1f7a3a;
  --apogee: #b4532a;
  --landing: #3d348b;
  --shadow: 0 1px 0 rgba(29, 26, 22, 0.04);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px 12px;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background:
    linear-gradient(var(--card), var(--card)) 15px 7px / 4px 20px no-repeat,
    var(--accent);
}

h1 {
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 0;
}

.tag, .hint, .hint-line, .chart-note, .notes, .event-delta, .event-alt {
  color: var(--muted);
}

.tag { margin: 2px 0 0; font-size: 0.92rem; max-width: 40rem; }

.mode-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card);
  gap: 2px;
}

.mode-switch button {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 8px 14px;
}

.mode-switch button[aria-selected="true"] {
  background: var(--accent);
  color: var(--accent-ink);
}

button:focus-visible, .file-button:focus-within, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.analyze-tools { display: flex; flex-wrap: wrap; gap: 8px; }
.runtime-retry-row { margin: 0 22px 10px; }
.runtime-retry-row button { font: inherit; }
.practice-files { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.practice-files button { font: inherit; }
.empty {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 20px;
  max-width: 46rem;
}
.empty h2 { margin: 0 0 8px; }
.empty p { margin: 0 0 10px; line-height: 1.45; color: var(--muted); }
.mono { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: 0.86em; }
.fold { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px 14px 8px; }
.fold summary { cursor: pointer; font-weight: 650; padding: 8px 0; }
.fold p { margin: 0 0 8px; line-height: 1.45; color: var(--muted); }
.marker-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.marker-head h2 { margin: 0; font-size: 1rem; }
.marker-head select, .offset-fields input { font: inherit; padding: 6px 8px; border: 1px solid #cfc6b6; border-radius: 8px; }
.offset-fields { display: flex; flex-wrap: wrap; gap: 10px; }

.origin-strip {
  margin: 0 22px 14px;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 650;
  letter-spacing: 0.01em;
  background: var(--sim-bg);
  color: var(--sim);
}

.origin-strip.measured {
  background: var(--measured-bg);
  color: var(--measured);
}

.origin-strip.idle {
  background: var(--card);
  color: var(--muted);
  font-weight: 500;
  border: 1px solid var(--line);
}

.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 16px;
  padding: 0 22px 28px;
  align-items: start;
}

body[data-mode="analyze"] .layout {
  grid-template-columns: minmax(0, 1fr);
}

.panel, .chart-card, .event, .limits {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.panel {
  position: sticky;
  top: 12px;
  max-height: calc(100vh - 168px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-scroll {
  overflow: auto;
  padding: 6px 14px 8px;
}

fieldset {
  border: 0;
  margin: 0;
  padding: 8px 0 4px;
}

legend {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0;
}

.field {
  display: grid;
  gap: 4px;
  margin: 10px 0;
}

.field-label { font-size: 0.92rem; font-weight: 600; }

.control {
  display: flex;
  align-items: stretch;
  border: 1px solid #cfc6b6;
  border-radius: 8px;
  background: white;
  overflow: hidden;
}

.control:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(14, 77, 108, 0.15);
}

input[type="text"], .control input, input[type="number"] {
  border: 0;
  width: 100%;
  font: inherit;
  font-variant-numeric: tabular-nums;
  padding: 8px 10px;
  background: transparent;
  color: var(--ink);
  min-width: 0;
}

input:focus { outline: none; }

.unit {
  display: grid;
  place-items: center;
  min-width: 52px;
  padding: 0 8px;
  background: #f6f1e8;
  color: var(--muted);
  font-size: 0.82rem;
  border-left: 1px solid var(--line);
}

.hint, .field-error, .form-error { font-size: 0.78rem; line-height: 1.35; }

.field-error, .form-error { color: var(--sim); min-height: 0; }

.field.invalid .control { border-color: var(--sim); }

.actions {
  display: grid;
  gap: 8px;
  padding: 12px 14px 10px;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

button, .file-button {
  font: inherit;
  border-radius: 9px;
  border: 1px solid #cfc6b6;
  background: white;
  color: var(--ink);
  padding: 9px 12px;
  cursor: pointer;
  text-align: center;
}

button:hover, .file-button:hover { border-color: #a79b88; }

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

.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 650;
}

.primary:hover { background: #0b3f58; }

.file-button input { display: none; }

.workspace { display: grid; gap: 12px; min-width: 0; }

.readout-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
}

.readout {
  margin: 0;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.zoom-actions, .legend { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.zoom-actions { flex-shrink: 0; }

.zoom-actions button, .check {
  font-size: 0.85rem;
  padding: 6px 10px;
}

.check { display: flex; gap: 6px; align-items: center; color: var(--ink); }

.chart-note, .notes, .hint-line { margin: 0; font-size: 0.85rem; }

.events {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.event { padding: 12px 14px 14px; border-top: 4px solid var(--line); }

.event[data-event="liftoff"] { border-top-color: var(--liftoff); }
.event[data-event="apogee"] { border-top-color: var(--apogee); }
.event[data-event="landing"] { border-top-color: var(--landing); }

.event h2 {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.event-time {
  margin: 6px 0 0;
  font-size: 1.45rem;
  font-weight: 680;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}

.event-alt, .event-delta { margin: 2px 0 0; font-size: 0.86rem; }

.chart-card { padding: 10px 12px 6px; }

.chart-card header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.chart-card h2 { margin: 0; font-size: 1rem; }

.unit-label { color: var(--muted); font-size: 0.82rem; }

.legend { margin-left: auto; font-size: 0.78rem; color: var(--muted); }

.swatch {
  display: inline-block;
  width: 18px;
  height: 0;
  border-top: 2px solid var(--accent);
  margin: 0 4px 0 8px;
  vertical-align: middle;
}

.swatch.truth { border-top-style: dashed; border-top-color: #3d4654; }

.chart-card, canvas {
  user-select: none;
  -webkit-user-select: none;
}

canvas {
  width: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

.window-form {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
}

.window-form input {
  width: 7.5rem;
  font: inherit;
  padding: 6px 8px;
  border: 1px solid #cfc6b6;
  border-radius: 8px;
  font-variant-numeric: tabular-nums;
}

#chart-altitude { height: 280px; }
#chart-pressure, #chart-temperature { height: 170px; }

.limits { padding: 4px 14px 12px; }

.limits summary { cursor: pointer; font-weight: 650; padding: 10px 0; }

.limits p { margin: 0 0 8px; line-height: 1.45; color: var(--muted); }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(29, 26, 22, 0.45);
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 20;
}

.modal[hidden] { display: none; }

.sheet {
  width: min(920px, 100%);
  max-height: min(92vh, 860px);
  overflow: auto;
  background: var(--card);
  border-radius: 16px;
  padding: 18px 18px 16px;
  box-shadow: 0 18px 50px rgba(29, 26, 22, 0.2);
}

.sheet h2 { margin: 0 0 6px; }

.import-options { margin: 10px 0; }

.choice-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }

.import-warnings { display: grid; gap: 6px; margin: 8px 0; }

.import-warnings p {
  margin: 0;
  padding: 8px 10px;
  background: #f8ead7;
  border-radius: 8px;
  color: #6a3b12;
  font-size: 0.86rem;
}

.import-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }

#import-table { width: 100%; border-collapse: collapse; font-size: 0.86rem; }

#import-table th, #import-table td {
  text-align: left;
  padding: 8px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

#import-table th { color: var(--muted); font-weight: 650; }

#import-table select, .import-extra input {
  font: inherit;
  padding: 6px 8px;
  border: 1px solid #cfc6b6;
  border-radius: 8px;
  background: white;
}

.samples { color: var(--muted); font-variant-numeric: tabular-nums; }

.import-extra { display: grid; gap: 10px; margin: 12px 0; }

.import-plan { font-weight: 600; }

.import-actions { display: flex; gap: 8px; }

.tracks { display: grid; gap: 8px; }
.track-bar, .marker-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.track-bar button { display: inline-flex; align-items: center; gap: 6px; }
.swatch-track { width: 10px; height: 10px; border-radius: 999px; display: inline-block; }
.source-markers {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 220px;
  overflow: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 6px 16px;
  font-size: 0.86rem;
}
.source-markers li { padding: 4px 0; border-top: 1px solid var(--line); }
.source-markers .timing { color: var(--muted); }
.source-markers li[data-timing="graphic"] .timing { color: var(--accent); }
.source-markers li[data-timing="audio"] .timing { color: #6b4f2a; }
.marker-form input, .marker-form select, .track-bar input { font: inherit; padding: 6px 8px; border: 1px solid #cfc6b6; border-radius: 8px; }

@media (max-width: 980px) {
  .top { flex-wrap: wrap; }
  .layout { grid-template-columns: 1fr; }
  body[data-mode="analyze"] .layout { grid-template-columns: minmax(0, 1fr); }
  .panel { position: static; max-height: none; }
  .events { grid-template-columns: 1fr; }
  #chart-altitude { height: 220px; }
  .readout-row { grid-template-columns: 1fr; }
}