:root {
  --bg: #06111d;
  --panel: #0d2033;
  --panel-2: #132a42;
  --border: rgba(255,255,255,.11);
  --text: #f4f8fb;
  --muted: #a9bac8;
  --accent: #55c7ff;
  --success: #58d68d;
  --warning: #ffbe5c;
  --danger: #ff6b74;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top right, rgba(85,199,255,.12), transparent 30rem), var(--bg);
  color: var(--text);
}

a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }

.topbar {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(6,17,29,.9);
  backdrop-filter: blur(14px);
}

.brand { font-weight: 800; }
nav { display: flex; gap: 22px; color: var(--muted); font-size: .95rem; }
nav a.active, nav a:hover { color: var(--text); }

.app-shell {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr) 310px;
  gap: 16px;
  padding: 16px;
  min-height: calc(100vh - 68px);
}

.sidebar, .viewport-panel, .results-panel {
  border: 1px solid var(--border);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(19,42,66,.97), rgba(9,26,43,.97));
}

.sidebar, .results-panel {
  padding: 20px;
  overflow: auto;
}

.viewport-panel { padding: 16px; min-width: 0; }

h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: 1.7rem; }
h2 { margin-bottom: 5px; font-size: 1.55rem; }
h3 { margin-bottom: 5px; }

.eyebrow {
  margin-bottom: 6px;
  color: var(--accent);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

.muted { color: var(--muted); }

.select-label {
  display: block;
  margin-top: 24px;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: .9rem;
}

select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #071522;
  color: var(--text);
}

.control {
  display: block;
  margin-top: 20px;
}

.control-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  font-size: .9rem;
}

.control-row span { color: var(--muted); }
.control-row strong { color: var(--text); }

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

.secondary-btn {
  width: 100%;
  margin-top: 24px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255,255,255,.04);
  color: var(--text);
  cursor: pointer;
}

.viewport-toolbar, .mission-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.status-badge {
  display: inline-flex;
  padding: 7px 11px;
  border-radius: 999px;
  border: 1px solid rgba(85,199,255,.3);
  background: rgba(85,199,255,.08);
  color: var(--accent);
  font-size: .84rem;
  font-weight: 800;
  white-space: nowrap;
}

.status-badge.success { color: var(--success); border-color: rgba(88,214,141,.32); background: rgba(88,214,141,.08); }
.status-badge.warning { color: var(--warning); border-color: rgba(255,190,92,.32); background: rgba(255,190,92,.08); }
.status-badge.danger { color: var(--danger); border-color: rgba(255,107,116,.32); background: rgba(255,107,116,.08); }

.scene-container {
  position: relative;
  height: min(64vh, 690px);
  min-height: 430px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #091a2a;
}

#sceneCanvas { width: 100%; height: 100%; display: block; }

.scene-help {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 7px 10px;
  border-radius: 9px;
  background: rgba(3,12,20,.66);
  color: rgba(255,255,255,.75);
  font-size: .8rem;
  pointer-events: none;
}

.mission-card {
  margin-top: 14px;
  padding: 17px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: rgba(255,255,255,.035);
}

.progress-track {
  height: 10px;
  margin-top: 12px;
  border-radius: 999px;
  background: rgba(255,255,255,.08);
  overflow: hidden;
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--success));
  transition: width .2s ease;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.result-card {
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: rgba(255,255,255,.035);
}

.result-card span {
  display: block;
  color: var(--muted);
  font-size: .8rem;
}

.result-card strong {
  display: block;
  margin-top: 4px;
  font-size: 1.25rem;
}

.explanation, .tradeoffs {
  margin-top: 16px;
  padding: 14px;
  border-radius: 13px;
  color: var(--muted);
  font-size: .9rem;
}

.explanation {
  border-left: 3px solid var(--accent);
  background: rgba(85,199,255,.07);
}

.tradeoffs {
  border: 1px solid var(--border);
  background: rgba(255,255,255,.025);
}

.tradeoffs h4 { margin: 0 0 8px; color: var(--text); }
.tradeoffs ul { margin: 0; padding-left: 18px; }
.tradeoffs li + li { margin-top: 5px; }

@media (max-width: 1180px) {
  .app-shell { grid-template-columns: 260px minmax(0,1fr); }
  .results-panel { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 14px 16px; gap: 10px; }
  nav { width: 100%; overflow-x: auto; white-space: nowrap; }
  .app-shell { grid-template-columns: 1fr; padding: 10px; }
  .scene-container { min-height: 360px; height: 55vh; }
}

.load-error {
  position: fixed;
  inset: 90px 20px auto 20px;
  z-index: 9999;
  max-width: 760px;
  margin: auto;
  padding: 18px;
  border: 1px solid rgba(255,107,116,.45);
  border-radius: 14px;
  background: rgba(55,10,18,.96);
  color: #ffd9dc;
  line-height: 1.5;
}

#aircraftColour {
  margin-bottom: 4px;
}