:root {
  --bg: #050708;
  --panel: #0c1014;
  --pill: #10161c;
  --border: #232b33;
  --text: #e8edf2;
  --muted: #6f7d8a;
  --green: #35d07f;
  --blue: #2f7bff;
  --amber: #ffb84d;
  --red: #ff5a5a;
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }

.app-shell {
  max-width: 560px;
  margin: 0 auto;
  padding: 14px 14px 90px;
}

.opt-panel { display: none; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px 18px; }
.opt-panel.active { display: block; }

.app-title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  color: var(--text);
}
.app-title-sep { color: var(--border); font-weight: 400; padding: 0 2px; }

.opt-header { display: flex; align-items: center; justify-content: space-between; }
.opt-header h1 {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  font-weight: 700;
  margin: 0;
  text-align: center;
  flex: 1;
}
.icon-btn { background: none; border: none; color: var(--muted); font-size: 1rem; cursor: pointer; padding: 4px 8px; }

.profile-line { font-size: 0.65rem; color: var(--muted); letter-spacing: 0.04em; margin: 6px 0 14px; text-align: center; }
.training-badge { color: var(--amber); }
.version-tag { color: var(--muted); font-weight: 700; }

.app-footer {
  margin: 18px 4px 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 0.6rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  line-height: 1.6;
  text-align: center;
}

.opt-form { display: flex; flex-direction: column; gap: 8px; }

.form-row {
  display: grid;
  grid-template-columns: 46px 1fr 46px 1fr;
  align-items: center;
  gap: 6px;
}
.weight-row { grid-template-columns: 46px 1fr auto; }

.f-label {
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  font-weight: 600;
}
.f-label-2 { text-align: right; }

.pill-input, .pill-select {
  width: 100%;
  background: var(--pill);
  border: 1px solid var(--border);
  color: var(--green);
  padding: 7px 8px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.pill-input::placeholder { color: var(--muted); font-weight: 500; }
.pill-select:disabled { opacity: 0.6; }
.pill-select option { background: var(--pill); color: var(--text); }

.pair { display: flex; gap: 5px; }
.pair .pill-input { width: 50%; }

.field-with-sub { display: flex; flex-direction: column; gap: 2px; }
.sub-label { font-size: 0.6rem; color: var(--muted); padding-left: 2px; line-height: 1; }

.ac-wrap { position: relative; }
.ac-list {
  position: absolute; top: 100%; left: 0; right: 0; z-index: 30;
  background: var(--pill); border: 1px solid var(--border); border-radius: 6px;
  margin-top: 2px; max-height: 220px; overflow-y: auto; display: none;
}
.ac-list.open { display: block; }
.ac-item { padding: 7px 10px; font-size: 0.75rem; color: var(--text); cursor: pointer; border-bottom: 1px solid var(--border); }
.ac-item:last-child { border-bottom: none; }
.ac-item:hover, .ac-item.active { background: rgba(53,208,127,0.12); }
.ac-item .code { color: var(--green); font-weight: 700; margin-right: 6px; }
.ac-item .sub { color: var(--muted); font-size: 0.66rem; display: block; }

.unit-tag { color: var(--muted); font-size: 0.7rem; font-weight: 600; padding: 0 4px; }

.calc-btn {
  margin-top: 8px;
  width: 100%;
  padding: 11px;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 7px;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 0.8rem;
  cursor: pointer;
}
.calc-btn:hover { filter: brightness(1.1); }

.results-block { margin-top: 16px; position: relative; padding-top: 10px; border-top: 1px solid var(--border); }

.exceed-banner {
  margin: 0 0 12px;
  padding: 8px 10px;
  background: rgba(255, 90, 90, 0.12);
  border: 1px solid var(--red);
  border-radius: 6px;
  color: var(--red);
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-align: center;
}
.exceed-banner[hidden] { display: none; }
.range-banner { white-space: pre-line; line-height: 1.6; letter-spacing: 0.02em; }

/* Plain label-over-value text, no card borders — matches the real OPT's
   results panel (label muted/small, value bold/white, no boxes). */
.result-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px 14px; margin-bottom: 14px; position: relative; align-items: start; }
.result-row.brake-row { grid-template-columns: repeat(5, 1fr); gap: 6px 8px; }
.result-row.brake-row .rv { font-size: 0.82rem; color: var(--green); }
.result-cell { display: flex; flex-direction: column; gap: 2px; }
.result-cell[hidden] { display: none; }
.result-cell.wide { grid-column: span 2; }
.rk { font-size: 0.62rem; color: var(--muted); letter-spacing: 0.05em; text-transform: uppercase; }
.rv { font-size: 0.95rem; font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }
.rv-big { font-size: 1.3rem; color: var(--green); }
.rv-sm { font-size: 0.75rem; }

/* Landing results: header line + label:value list style (matches the real
   OPT's "Enroute Landing Data for..." screen rather than a card grid). */
.ldg-header { font-size: 0.85rem; color: var(--text); margin: 0 0 12px; line-height: 1.6; }
.ldg-header b { color: var(--text); }
.ldg-vref-line { display: block; color: var(--muted); font-size: 0.75rem; margin-top: 2px; }
.ldg-vref-line b { color: var(--green); font-size: 1rem; }
#out-vref-flap, #out-vref-add { color: var(--text); }

.ldg-subhead { font-size: 0.65rem; color: var(--muted); letter-spacing: 0.05em; text-transform: uppercase; margin: 14px 0 4px; }
.ldg-list { display: flex; flex-direction: column; gap: 3px; }
.ldg-row { display: flex; align-items: baseline; gap: 8px; font-size: 0.82rem; padding: 2px 0; }
.ldg-row[hidden] { display: none; }
.ldg-label { color: var(--muted); min-width: 90px; }
.ldg-value { color: var(--text); font-weight: 700; font-variant-numeric: tabular-nums; }
.ldg-row.amber .ldg-value { color: var(--amber); }

.ldg-cool-header { display: flex; gap: 8px; font-size: 0.6rem; color: var(--muted); text-transform: uppercase; }
.ldg-cool-header span { min-width: 60px; }
.ldg-cool-header span:first-child { min-width: 90px; }
.ldg-cool-row .ldg-value { min-width: 60px; }

.watermark {
  position: absolute;
  right: 0;
  bottom: -6px;
  font-size: 2.1rem;
  font-weight: 800;
  color: rgba(255,255,255,0.09);
  letter-spacing: 0.06em;
  white-space: nowrap;
  pointer-events: none;
}

/* Takeoff results: left column of label/value rows + a narrow right-side
   V-speed column (matches the real OPT's card layout, V1/VR/V2/Vref40
   stacked and bold rather than sharing a 3-up grid with everything else). */
.results-split { display: flex; gap: 16px; align-items: flex-start; }
.results-left { flex: 1; min-width: 0; position: relative; }
.vspeed-col { display: flex; flex-direction: column; gap: 10px; padding-left: 14px; border-left: 1px solid var(--border); }
.vspeed-item { display: flex; align-items: baseline; gap: 8px; justify-content: space-between; }
.vspeed-item .rk { white-space: nowrap; }

.toggle-row {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.68rem; color: var(--muted); letter-spacing: 0.03em;
  margin: 10px 0 4px; cursor: pointer; user-select: none;
}
.toggle-row input { display: none; }
.toggle-track {
  width: 30px; height: 16px; border-radius: 999px; background: var(--border);
  position: relative; transition: background 0.15s;
}
.toggle-track::after {
  content: ""; position: absolute; top: 2px; left: 2px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--muted); transition: left 0.15s, background 0.15s;
}
.toggle-row input:checked + .toggle-track { background: rgba(53,208,127,0.25); }
.toggle-row input:checked + .toggle-track::after { left: 16px; background: var(--green); }

.rwy-graphic { margin-top: 8px; background: var(--pill); border: 1px solid var(--border); border-radius: 8px; padding: 8px; }
.rwy-graphic svg { display: block; width: 100%; height: auto; }

.hint-details { margin-top: 10px; position: relative; z-index: 1; }
.hint-details summary {
  font-size: 0.68rem;
  color: var(--blue);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.hint-details summary::-webkit-details-marker { display: none; }
.hint { margin-top: 8px; font-size: 0.68rem; color: var(--muted); line-height: 1.5; }

.bottom-tabs {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: flex; justify-content: center; gap: 2px;
  background: #080b0d; border-top: 1px solid var(--border);
  padding: 8px 14px calc(8px + env(safe-area-inset-bottom));
}
.bottom-tab {
  background: transparent; border: 1px solid transparent; color: var(--muted);
  padding: 9px 18px; border-radius: 7px; font-weight: 700; font-size: 0.7rem;
  letter-spacing: 0.04em; cursor: pointer; max-width: 220px; flex: 1;
}
.bottom-tab.active { background: var(--blue); color: #fff; }

.calc-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.72);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.calc-overlay[hidden] { display: none; }
.calc-modal {
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  padding: 22px 28px; text-align: center; min-width: 260px;
}
.calc-title { font-size: 0.9rem; font-weight: 700; margin: 0 0 14px; }
.calc-bar { height: 6px; background: var(--border); border-radius: 999px; overflow: hidden; }
.calc-bar-fill { height: 100%; width: 0%; background: var(--blue); border-radius: 999px; transition: width 0.2s linear; }

@media (max-width: 480px) {
  .form-row { grid-template-columns: 40px 1fr 40px 1fr; }
  .f-label, .f-label-2 { font-size: 0.56rem; }
}