/* Calculator page. Colours, fonts and layout come from ../style.css (the home page);
   these rules add only what the calculator needs. Contrast checked against #F0EAFC:
   ink 14.2, muted 5.9, accent 6.7, field border 4.0, error 5.6, check 6.3. */
:root {
  --line: #7A6E94;
  --err: #B3261E;
  --warn: #7A4B00;
  --panel: rgba(255,255,255,0.55);
}

a.wordmark {
  color: var(--ink);
  text-decoration: none;
  margin-bottom: 0;
}
a.wordmark:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 6px; }

h1, h2 { font-family: 'Sora', sans-serif; letter-spacing: -0.02em; }
h1 { font-weight: 600; font-size: clamp(28px, 6.5vw, 38px); line-height: 1.15; margin: 0 0 0.75rem; }
h2 { font-weight: 500; font-size: 20px; line-height: 1.25; margin: 0 0 0.75rem; }

.lede { font-size: 18px; margin: 0; color: var(--ink); }
.plain { margin: 0 0 1rem; color: var(--muted); font-size: 15px; }

.panel {
  background: var(--panel);
  border-radius: 12px;
  padding: 1.25rem;
  margin: 0;
}
noscript .panel { display: block; }

/* Inputs */
.fields { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.fields.single { grid-template-columns: minmax(0, 14rem); margin-bottom: 0.5rem; }
.field label { display: block; font-weight: 500; font-size: 15px; margin-bottom: 0.35rem; }
.input-wrap { position: relative; }
.input-wrap input {
  width: 100%;
  height: 48px;
  padding: 0 2.4rem 0 0.8rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 18px;
  color: var(--ink);
  background: #fff;
  border: 1.5px solid var(--line);
  border-radius: 8px;
}
.input-wrap input[aria-invalid="true"] { border-color: var(--err); border-width: 2px; }
.unit {
  position: absolute; right: 0.8rem; top: 50%; transform: translateY(-50%);
  font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 14px; color: var(--muted);
  pointer-events: none;
}
input:focus-visible, button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}
.hint { margin: 0.35rem 0 0; font-size: 13px; color: var(--muted); line-height: 1.4; }
.msg { margin: 0.35rem 0 0; font-size: 14px; line-height: 1.4; }
.msg.error { color: var(--err); }
.msg.warn { color: var(--warn); }
.msg[hidden], .working[hidden], .marker[hidden] { display: none; }

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.25rem; }
.btn {
  min-height: 44px;
  padding: 0 1rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 14px;
  color: var(--accent);
  background: transparent;
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
}
.btn:hover { background: rgba(99,52,181,0.08); }

/* Result */
.stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 0 0 0.5rem; }
.stat dt { font-size: 14px; color: var(--muted); }
.stat dd { margin: 0; }
.num {
  font-family: 'Sora', sans-serif; font-weight: 600;
  font-size: clamp(30px, 9vw, 44px); line-height: 1.1; letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}
.bar { position: relative; height: 10px; border-radius: 999px; background: rgba(32,26,50,0.14); margin: 1.4rem 0 0.35rem; }
.band { position: absolute; left: 35%; width: 30%; top: 0; bottom: 0; background: rgba(99,52,181,0.35); }
.marker { position: absolute; top: -7px; width: 4px; height: 24px; margin-left: -2px; background: var(--ink); border-radius: 2px; }
.ticks { position: relative; height: 1.3rem; font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 12px; color: var(--muted); }
.ticks span { position: absolute; top: 0; transform: translateX(-50%); }
.ticks .first { left: 0; transform: none; }
.ticks .t17 { left: 35%; }
.ticks .t23 { left: 65%; }
.ticks .last { right: 0; transform: none; }
.note { margin: 0.75rem 0 0; font-size: 16px; }
.working { margin: 0.5rem 0 0; font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 13px; color: var(--muted); line-height: 1.5; overflow-wrap: anywhere; }
.target-line { margin: 0.5rem 0 0; font-size: 16px; }
.target-line strong { font-family: 'JetBrains Mono', ui-monospace, monospace; font-weight: 500; white-space: nowrap; }
#target-caveat { font-family: 'Inter Tight', system-ui, sans-serif; font-size: 14px; }

@media (prefers-reduced-motion: no-preference) {
  .marker { transition: left .25s ease; }
}

/* Explanatory text */
.prose, .sources { display: block; }
.prose h2, .sources h2 { margin-top: 1.75rem; }
.prose > h2:first-child { margin-top: 0; }
.prose p, .sources li, .app-note p { margin: 0 0 0.9rem; }
.prose li { margin-bottom: 0.5rem; }
.prose ul { padding-left: 1.2rem; margin: 0 0 0.9rem; }
.formula {
  font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 15px;
  background: var(--panel); border-radius: 8px; padding: 0.8rem 1rem; overflow-wrap: anywhere;
}
.prose a, .sources a, footer a, .app-note a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}
.cite { text-decoration: none; padding: 0 1px; }
.sources ol { padding-left: 1.4rem; margin: 0; font-size: 14px; color: var(--muted); }
.sources li { overflow-wrap: anywhere; }
.sources h2 { margin-top: 0; }

.app-note { border-left: 4px solid var(--accent); border-radius: 4px 12px 12px 4px; }
.app-note p:last-child { margin-bottom: 0; }
.store-link { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 15px; }

footer { margin-top: 0; font-size: 13px; line-height: 1.6; }
footer p { margin: 0 0 0.5rem; }
footer .privacy { color: var(--muted); }

@media (max-width: 560px) {
  .fields { grid-template-columns: 1fr; }
  .fields.single { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .panel { padding: 1rem; }
  .btn { flex: 1 1 auto; }
}