/* ==========================================================================
   Shared design system — dark navy / amber
   ========================================================================== */

:root {
  --navy-900: #070d18;
  --navy-850: #0b1424;
  --navy-800: #101c31;
  --navy-700: #17263f;
  --navy-600: #203150;
  --line: #24344f;
  --line-soft: #1a2740;

  --amber: #f0a500;
  --amber-soft: #ffc855;
  --amber-dim: rgba(240, 165, 0, 0.14);

  --text: #e8edf6;
  --text-dim: #9aa9c0;
  --text-faint: #6b7c96;

  --airbus: #3d91dc;
  --boeing: #c58200;
  --pos: #3fb98a;
  --neg: #e2574c;

  --radius: 10px;
  --radius-sm: 6px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--navy-900);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--amber); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 0.4em; font-weight: 600; }
h1 { font-size: clamp(1.6rem, 4vw, 2.3rem); letter-spacing: -0.02em; }
h2 { font-size: 1.15rem; letter-spacing: -0.01em; }
h3 { font-size: 0.95rem; }

/* ---- Layout ------------------------------------------------------------ */

.wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding-inline: 20px;
}

/* ---- Header ------------------------------------------------------------ */

.site-header {
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, var(--navy-850), var(--navy-900));
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  padding-block: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  font-size: 1rem;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border-radius: var(--radius-sm);
  background: var(--amber-dim);
  border: 1px solid rgba(240, 165, 0, 0.3);
  flex: none;
}
.brand-mark svg { width: 15px; height: 15px; fill: var(--amber); }

.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }

.nav a {
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
}
.nav a:hover { color: var(--text); background: var(--navy-700); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--amber); background: var(--amber-dim); }

/* ---- Hero -------------------------------------------------------------- */

.hero { padding-block: 56px 40px; border-bottom: 1px solid var(--line-soft); }
.hero p.lede {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 62ch;
  margin: 0;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 12px;
}

/* ---- Cards ------------------------------------------------------------- */

main { padding-block: 36px 64px; }

.card {
  background: var(--navy-850);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.card + .card { margin-top: 20px; }

.card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.card-head h2 { margin: 0; }
.card-head .hint { color: var(--text-faint); font-size: 0.82rem; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

/* Tool cards on the home page */
.tool-card {
  display: block;
  background: var(--navy-850);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}
.tool-card:hover {
  text-decoration: none;
  border-color: var(--amber);
  transform: translateY(-2px);
}
.tool-card h2 { color: var(--text); }
.tool-card p { color: var(--text-dim); margin: 0 0 14px; font-size: 0.92rem; }
.tool-card .go { color: var(--amber); font-size: 0.85rem; font-weight: 600; }

/* ---- Forms ------------------------------------------------------------- */

.field { margin-bottom: 14px; }

label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 5px;
  letter-spacing: 0.01em;
}

label .unit { color: var(--text-faint); font-weight: 400; }

input[type="number"], input[type="text"], select {
  width: 100%;
  background: var(--navy-900);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 9px 11px;
  font-size: 0.92rem;
  font-family: inherit;
}
input[type="number"] { font-family: var(--mono); }

input:focus, select:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-dim);
}

select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-dim) 50%),
    linear-gradient(135deg, var(--text-dim) 50%, transparent 50%);
  background-position: calc(100% - 17px) 51%, calc(100% - 12px) 51%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 32px;
}
select optgroup { background: var(--navy-800); color: var(--text-faint); }
select option { background: var(--navy-800); color: var(--text); }

.field-row { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }

/* ---- Results ----------------------------------------------------------- */

.stat {
  background: var(--navy-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}
.stat .k {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-faint);
  margin-bottom: 6px;
}
.stat .v {
  font-family: var(--mono);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.stat .v small { font-size: 0.6em; color: var(--text-dim); font-weight: 400; margin-left: 3px; }
.stat.accent { border-color: rgba(240, 165, 0, 0.4); background: var(--amber-dim); }
.stat.accent .v { color: var(--amber); }

/* ---- Tables ------------------------------------------------------------ */

.table-scroll { overflow-x: auto; margin-inline: -4px; padding-inline: 4px; }

table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }

th {
  text-align: left;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  font-weight: 600;
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: baseline;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--navy-800); }

td.num, th.num { text-align: right; font-family: var(--mono); white-space: nowrap; }
tr.total td { font-weight: 600; border-top: 1px solid var(--line); background: var(--navy-800); }

/* ---- Bars -------------------------------------------------------------- */

.bar-row {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
  font-size: 0.85rem;
}
.bar-row .lbl { color: var(--text-dim); }
.bar-track {
  background: var(--navy-700);
  border-radius: 3px;
  height: 9px;
  overflow: hidden;
}
.bar-fill { height: 100%; border-radius: 3px; transition: width 0.4s ease; }
.bar-row .val { font-family: var(--mono); font-size: 0.82rem; min-width: 52px; text-align: right; }

.fill-airbus { background: var(--airbus); }
.fill-boeing { background: var(--boeing); }

/* ---- Misc -------------------------------------------------------------- */

.tag {
  display: inline-block;
  font-size: 0.7rem;
  font-family: var(--mono);
  padding: 2px 7px;
  border-radius: 3px;
  border: 1px solid var(--line);
  color: var(--text-dim);
}
.tag.airbus { color: #6cb4ef; border-color: rgba(61, 145, 220, 0.45); }
.tag.boeing { color: #e0a838; border-color: rgba(197, 130, 0, 0.45); }

.legend { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-dim); flex-wrap: wrap; }
.legend span { display: flex; align-items: center; gap: 6px; }
.swatch { width: 10px; height: 10px; border-radius: 2px; flex: none; }

.warn {
  background: rgba(226, 87, 76, 0.1);
  border: 1px solid rgba(226, 87, 76, 0.35);
  color: #f0a7a0;
  border-radius: var(--radius-sm);
  padding: 10px 13px;
  font-size: 0.85rem;
  margin-bottom: 14px;
}
.warn:empty { display: none; }

.note {
  color: var(--text-faint);
  font-size: 0.82rem;
  line-height: 1.6;
}
.note li { margin-bottom: 7px; }

.disclaimer {
  border-top: 1px solid var(--line-soft);
  margin-top: 28px;
  padding-top: 18px;
}

.site-footer {
  border-top: 1px solid var(--line-soft);
  padding-block: 24px 40px;
  color: var(--text-faint);
  font-size: 0.82rem;
}
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* ---- Tabs -------------------------------------------------------------- */

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 20px; flex-wrap: wrap; }
.tabs button {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  padding: 9px 14px;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  margin-bottom: -1px;
}
.tabs button:hover { color: var(--text); }
.tabs button[aria-selected="true"] { color: var(--amber); border-bottom-color: var(--amber); }

@media (max-width: 620px) {
  .field-row { grid-template-columns: 1fr; }
  .bar-row { grid-template-columns: 96px 1fr auto; font-size: 0.8rem; }
  .hero { padding-block: 36px 28px; }
}