:root {
  --bg: #f5f6f8;
  --card: #fff;
  --ink: #1b2330;
  --muted: #6b7280;
  --border: #e3e6ec;
  --accent: #1e6feb;
  --go: #137a3a;
  --no-go: #b3261e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.4;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 { margin: 0 0 0.25rem; font-size: 1.75rem; }
h2 { margin: 0 0 1rem; font-size: 1.1rem; }
.tagline { color: var(--muted); margin-top: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.row { display: flex; gap: 0.75rem; align-items: end; flex-wrap: wrap; }
.row label { flex: 1 1 200px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--muted);
  gap: 0.25rem;
}

input {
  font: inherit;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
}
input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

button {
  font: inherit;
  padding: 0.55rem 1rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
}
button:hover { filter: brightness(1.05); }

.status {
  margin: 0.5rem 0 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  word-break: break-all;
}
.status.error { color: var(--no-go); }

.results dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1rem;
  margin: 0 0 1rem;
}
.results dl > div { display: contents; }
.results dt { color: var(--muted); font-size: 0.9rem; }
.results dd { margin: 0; font-variant-numeric: tabular-nums; text-align: right; }

.verdict {
  margin: 0;
  padding: 0.75rem;
  border-radius: 6px;
  font-weight: 600;
  text-align: center;
  background: #eef1f5;
  color: var(--ink);
}
.verdict.go { background: #e3f4ea; color: var(--go); }
.verdict.no-go { background: #fbe6e4; color: var(--no-go); }

.chart-note {
  color: var(--muted);
  font-size: 0.85rem;
  margin: -0.25rem 0 0.75rem;
}
.factors h3 {
  font-size: 0.95rem;
  margin: 1rem 0 0.5rem;
}
.factors ul {
  margin: 0 0 0.5rem;
  padding-left: 1.25rem;
  font-size: 0.9rem;
}
.factors li { margin-bottom: 0.35rem; }
.factors p { font-size: 0.9rem; margin: 0.5rem 0; }
.factors .footnote {
  margin-top: 1rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.disclaimer {
  max-width: 520px;
  width: calc(100% - 2rem);
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--ink);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
}
.disclaimer::backdrop {
  background: rgba(20, 25, 35, 0.55);
  backdrop-filter: blur(2px);
}
.disclaimer h2 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}
.disclaimer p { margin: 0.5rem 0; font-size: 0.92rem; line-height: 1.5; }
.disclaimer ul {
  margin: 0.5rem 0 0.75rem;
  padding-left: 1.25rem;
  font-size: 0.9rem;
}
.disclaimer li { margin-bottom: 0.4rem; line-height: 1.4; }
.disclaimer form { margin-top: 1.25rem; text-align: right; }
.disclaimer button {
  font-size: 0.95rem;
  padding: 0.6rem 1.1rem;
}

.runway-picker { margin-top: 0.75rem; }
.slope-row { margin-top: 0.75rem; }

.ios-install {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: #1e6feb;
  color: #fff;
  font-size: 0.9rem;
  line-height: 1.35;
  position: sticky;
  top: 0;
  z-index: 10;
}
.ios-install-body { flex: 1; }
.ios-install em { font-style: normal; font-weight: 600; }
.ios-install .ios-share {
  display: inline-block;
  font-weight: 700;
  transform: translateY(-1px);
}
#ios-install-dismiss {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
  font-size: 1.2rem;
  line-height: 1;
  padding: 0.1rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
}
#ios-install-dismiss:hover { background: rgba(255, 255, 255, 0.15); }
.runway-picker-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.4rem;
}
#runway-options { display: grid; gap: 0.4rem; }
.runway-option {
  display: grid;
  grid-template-columns: auto auto 1fr auto auto;
  gap: 0.6rem;
  align-items: center;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  background: #fafbfd;
}
.runway-option .rwy-slope {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  min-width: 3.5rem;
}
.runway-option:hover { background: #f1f4f9; }
.runway-option.selected {
  border-color: var(--accent);
  background: #eef4ff;
}
.runway-option input[type="radio"] { margin: 0; }
.runway-option .rwy-id { font-weight: 600; min-width: 3.5rem; }
.runway-option .rwy-len { color: var(--muted); }
.runway-option .rwy-wind {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
#koch-svg {
  width: 100%;
  height: auto;
  display: block;
  background: #fff;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
#koch-svg text { fill: var(--ink); }

footer {
  margin-top: 2rem;
  font-size: 0.8rem;
  color: var(--muted);
}
footer a { color: var(--accent); }