:root {
  --bg: #0b0f14;
  --bg-2: #10161e;
  --panel: rgba(9, 13, 19, 0.66);
  --line: rgba(255, 255, 255, 0.09);
  --text: #e8eef5;
  --muted: #94a3b5;
  --accent: #48d39b;
  --warn: #f0b429;
  --bad: #e5604b;
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

.wrap {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--line);
  padding: 26px 0 20px;
  background: linear-gradient(180deg, #0e141c, var(--bg));
}

.masthead h1 {
  margin: 0 0 6px;
  font-size: clamp(1.35rem, 1.1rem + 1.2vw, 1.9rem);
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 62ch;
}

main {
  padding: 22px 0 40px;
  flex: 1 0 auto;
}

/* ---------- lookup form ---------- */

.lookup {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 16px;
}

.field {
  flex: 1 1 320px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

#coord {
  width: 100%;
  min-width: 0;
  padding: 11px 13px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text);
  font-size: 0.95rem;
  font-family: var(--mono);
}

#coord::placeholder {
  color: #5d6b7c;
  font-family: var(--font);
}

#coord:focus-visible,
.btn:focus-visible,
.unit-btn:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.actions {
  display: flex;
  gap: 8px;
  flex: 0 0 auto;
}

.btn {
  padding: 11px 18px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--text);
  font-size: 0.92rem;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
}

.btn.primary {
  background: var(--accent);
  border-color: transparent;
  color: #05211a;
  font-weight: 600;
}

.btn.ghost:hover,
.btn.tiny:hover {
  border-color: rgba(255, 255, 255, 0.25);
}

.btn.tiny {
  padding: 7px 12px;
  font-size: 0.8rem;
  margin-top: 10px;
}

.btn[aria-busy="true"] {
  opacity: 0.6;
  cursor: progress;
}

.form-msg {
  flex: 1 1 100%;
  margin: 0;
  min-height: 1.2em;
  font-size: 0.88rem;
  color: var(--muted);
}

.form-msg[data-kind="error"] {
  color: var(--bad);
}

/* ---------- stage ---------- */

.stage-wrap {
  position: relative;
  margin-bottom: 18px;
}

.stage {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  min-height: 340px;
  background: radial-gradient(120% 90% at 70% 0%, #1b2a3a 0%, #0d141c 55%, #090d12 100%);
}

.canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.canvas[hidden] {
  display: none;
}

.stage-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  text-align: center;
  padding: 24px;
}

.stage-fallback[hidden] {
  display: none;
}

.fallback-turbine {
  width: min(46%, 220px);
  height: auto;
  color: #46617d;
}

.fallback-msg {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 46ch;
}

/* ---------- hud ---------- */

.hud {
  position: absolute;
  z-index: 2;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
}

.hud-top {
  top: 12px;
  left: 12px;
  right: 12px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  padding: 9px 12px;
  max-width: max-content;
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.09);
  color: var(--text);
}

.badge[data-state="generating"],
.badge[data-state="rated"] {
  background: rgba(72, 211, 155, 0.16);
  color: var(--accent);
}

.badge[data-state="parked"],
.badge[data-state="idle"] {
  background: rgba(255, 255, 255, 0.08);
  color: #a9b6c6;
}

.badge[data-state="cutout"],
.badge[data-state="error"] {
  background: rgba(229, 96, 75, 0.16);
  color: var(--bad);
}

.badge[data-state="loading"] {
  background: rgba(240, 180, 41, 0.16);
  color: var(--warn);
}

.state-note {
  font-size: 0.83rem;
  color: var(--muted);
}

/* ---------- readout ---------- */

.readout-panel {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  width: 306px;
  max-width: calc(100% - 24px);
  padding: 12px 13px 13px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
}

.readout {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.readout .row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
}

.readout dt {
  color: var(--muted);
  font-size: 0.8rem;
  white-space: nowrap;
}

.readout dd {
  margin: 0;
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
  overflow-wrap: anywhere;
}

.mono {
  font-family: var(--mono);
  font-size: 0.82rem;
}

.arrow {
  display: inline-block;
  font-size: 1.05rem;
  line-height: 1;
  transition: transform 0.6s ease-out;
}

.unit-btn {
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  color: var(--muted);
  font-size: 0.72rem;
  font-family: var(--mono);
  cursor: pointer;
}

.unit-fixed {
  color: var(--muted);
  font-size: 0.76rem;
}

/* ---------- assumptions ---------- */

.assumptions {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-2);
  padding: 0 16px;
}

.assumptions summary {
  padding: 14px 0;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--text);
}

.assumptions-body {
  padding: 4px 0 18px;
  display: grid;
  gap: 16px;
}

table.spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

table.spec th,
table.spec td {
  text-align: left;
  padding: 6px 10px 6px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

table.spec td:last-child {
  font-family: var(--mono);
  color: #cfe0f0;
}

.explain p {
  margin: 0 0 10px;
  font-size: 0.88rem;
  line-height: 1.55;
  color: #c3cfdc;
  max-width: 80ch;
}

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

.foot {
  border-top: 1px solid var(--line);
  padding: 18px 0 26px;
  color: var(--muted);
  font-size: 0.82rem;
}

.foot p {
  margin: 0;
  max-width: 80ch;
}

/* ---------- narrow screens ---------- */

@media (max-width: 700px) {
  .stage {
    aspect-ratio: 4 / 3;
    min-height: 300px;
  }

  .readout-panel {
    position: static;
    width: auto;
    max-width: none;
    margin-top: 12px;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .readout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
  }

  .readout .row {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .readout dd {
    text-align: left;
  }

  .actions {
    width: 100%;
  }

  .actions .btn {
    flex: 1 1 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .arrow {
    transition: none;
  }
}