/* Pearl Burn — ember/ash volcanic theme.
 * Basalt black, magma gradients, ash-gray text. Dark and luminous,
 * in the Pearl brand family, with its own volcanic personality. */
:root {
  --basalt: #0d0b09;
  --basalt-2: #161210;
  --basalt-3: #1f1917;
  --ash: #b8b0a8;
  --ash-dim: #938c85;
  --ember: #ff6b35;
  --ember-hot: #ffd166;
  --magma: #c1121f;
  --coal: #2b2d42;
  --line: #2e2622;
  --ok: #7bd88f;
  --bad: #ff5d5d;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 50% -10%, rgba(193, 18, 31, 0.14), transparent 60%),
    radial-gradient(900px 420px at 85% 110%, rgba(255, 107, 53, 0.08), transparent 60%),
    var(--basalt);
  color: var(--ash);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  line-height: 1.55;
}
.topbar {
  display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between;
  padding: 1.1rem 1.5rem;
  background: linear-gradient(180deg, #1a1210, var(--basalt-2));
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; gap: 0.9rem; align-items: center; }
.brand h1 {
  margin: 0; font-size: 1.5rem; letter-spacing: 0.04em;
  background: linear-gradient(100deg, var(--ember-hot), var(--ember) 55%, var(--magma));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.tagline { margin: 0.1rem 0 0; font-size: 0.85rem; color: var(--ash-dim); }
.seal { width: 52px; height: 52px; filter: drop-shadow(0 0 10px rgba(255, 107, 53, 0.45)); }
.seal .ring { fill: none; stroke: var(--ember); stroke-width: 2.5; opacity: 0.9; }
.seal .flame { opacity: 0.95; }
.seal .core { opacity: 0.9; }
.steps { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.steps button {
  background: var(--basalt-3); color: var(--ash-dim);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 0.45rem 0.95rem; cursor: pointer; font-size: 0.88rem;
}
.steps button.active {
  color: #1a0f08; font-weight: 700;
  background: linear-gradient(100deg, var(--ember-hot), var(--ember));
  border-color: transparent;
  box-shadow: 0 0 14px rgba(255, 107, 53, 0.5);
}
.margin-strip {
  overflow: hidden; white-space: nowrap;
  border-bottom: 1px solid var(--line);
  padding: 0.35rem 0; background: #120d0b;
}
.margin-strip span {
  display: inline-block; padding-left: 100%;
  animation: drift 30s linear infinite;
  font-size: 0.72rem; letter-spacing: 0.28em; color: var(--ash-dim);
}
@keyframes drift { to { transform: translateX(-100%); } }
.limits {
  margin: 1rem auto; max-width: 1080px; padding: 1rem 1.25rem;
  background: linear-gradient(180deg, rgba(193, 18, 31, 0.10), rgba(193, 18, 31, 0.03));
  border: 1px solid #4a1f1a; border-radius: var(--radius);
}
.limits h2 { margin: 0 0 0.5rem; color: var(--ember-hot); font-size: 0.95rem; }
.limits ul { margin: 0; padding-left: 1.2rem; font-size: 0.88rem; }
.limits li { margin: 0.25rem 0; }
.limits code { color: var(--ember-hot); }
main { max-width: 1080px; margin: 0 auto; padding: 0 1.25rem 3rem; }
.panel { display: none; }
.panel.active { display: block; animation: rise 0.25s ease-out; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } }
.panel h2 {
  font-size: 1.35rem; margin: 1.4rem 0 0.4rem;
  color: var(--ember-hot);
}
.panel h3 { color: var(--ember); margin: 1.6rem 0 0.5rem; font-size: 1.05rem; }
.lede { color: var(--ash); max-width: 72ch; }
.lede code, .note-box code { color: var(--ember-hot); font-size: 0.85em; }
.form-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 0.9rem; margin: 1.1rem 0;
}
label { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.88rem; color: var(--ash-dim); }
label.wide { grid-column: 1 / -1; }
input, select, textarea {
  background: #0f0c0a; border: 1px solid var(--line); color: var(--ash);
  border-radius: 8px; padding: 0.6rem 0.7rem; font-size: 0.95rem; font-family: inherit;
}
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--ember);
  box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.25);
}
textarea { font-family: ui-monospace, Consolas, monospace; font-size: 0.82rem; resize: vertical; }
.row { display: flex; gap: 0.6rem; flex-wrap: wrap; margin: 0.9rem 0; }
button {
  border-radius: 8px; padding: 0.6rem 1.1rem; font-size: 0.92rem; cursor: pointer;
  border: 1px solid var(--line); background: var(--basalt-3); color: var(--ash);
}
button.primary {
  background: linear-gradient(100deg, var(--ember-hot), var(--ember) 60%, #d35962);
  color: #1a0f08; font-weight: 700; border: none;
  box-shadow: 0 2px 16px rgba(255, 107, 53, 0.35);
}
button.primary:hover { filter: brightness(1.08); }
button.secondary:hover { border-color: var(--ember); color: var(--ember-hot); }
button.copy { padding: 0.35rem 0.7rem; font-size: 0.8rem; }
.result-box, .verdict-box {
  margin: 1.1rem 0; padding: 1.1rem 1.25rem;
  background: var(--basalt-2); border: 1px solid var(--line); border-radius: var(--radius);
}
.kv {
  display: grid; grid-template-columns: 170px 1fr auto; gap: 0.6rem; align-items: center;
  padding: 0.45rem 0; border-bottom: 1px dashed #2a2320;
}
.kv:last-child { border-bottom: none; }
.kv > span { color: var(--ash-dim); font-size: 0.85rem; }
.kv code {
  font-family: ui-monospace, Consolas, monospace; font-size: 0.82rem;
  color: var(--ember-hot); word-break: break-all;
}
.kv code.addr { color: #ffe8c2; font-size: 0.9rem; }
.qr-wrap { display: flex; gap: 1rem; align-items: center; margin-top: 0.8rem; }
.qr { background: #fff; padding: 8px; border-radius: 8px; display: inline-block; }
.qr img { display: block; }
.hint { font-size: 0.82rem; color: var(--ash-dim); max-width: 30ch; }
.note-box {
  margin: 1rem 0 0; padding: 0.8rem 1rem; font-size: 0.86rem;
  background: rgba(255, 107, 53, 0.07); border-left: 3px solid var(--ember);
  border-radius: 0 8px 8px 0;
}
.error-box {
  margin: 1rem 0; padding: 0.9rem 1.1rem; font-size: 0.9rem;
  background: rgba(193, 18, 31, 0.12); border: 1px solid var(--magma);
  border-radius: var(--radius); color: #ffb3a6;
}
.verdict-box.proven { border-color: var(--ok); background: rgba(123, 216, 143, 0.07); }
.verdict-box.unproven { border-color: var(--bad); background: rgba(255, 93, 93, 0.07); }
.verdict { font-size: 1.6rem; font-weight: 800; letter-spacing: 0.06em; margin: 0 0 0.5rem; }
.verdict-box.proven .verdict { color: var(--ok); text-shadow: 0 0 18px rgba(123, 216, 143, 0.5); }
.verdict-box.unproven .verdict { color: var(--bad); text-shadow: 0 0 18px rgba(255, 93, 93, 0.5); }
.verdict-box ul { margin: 0.4rem 0 0; padding-left: 1.2rem; font-size: 0.88rem; }
footer {
  border-top: 1px solid var(--line); padding: 1.4rem; text-align: center;
  color: var(--ash-dim); font-size: 0.85rem;
}
footer a { color: var(--ember); }
footer code { font-size: 0.78rem; color: var(--ash); word-break: break-all; }
footer .fine { font-size: 0.75rem; margin-top: 0.4rem; }
@media (max-width: 640px) {
  .kv { grid-template-columns: 1fr; }
  .kv > span { font-weight: 600; }
}

/* Keyboard focus: a visible ring in this app's accent on every interactive element (fleet focus-visible pass). */
:focus-visible { outline: 2px solid var(--ember); outline-offset: 2px; }

/* Skip link: the first Tab stop on the page — parked off-screen until keyboard focus reveals it (fleet skip-link pass). */
.skip-link { position: absolute; left: 12px; top: -64px; z-index: 1000; padding: 10px 16px; border: 2px solid var(--ember); border-radius: 8px; background: #0b0e14; color: var(--ember); font-weight: 700; text-decoration: none; transition: top .15s ease; }
.skip-link:focus-visible { top: 12px; }
main:focus { outline: none; }

/* Reduced motion: when the OS asks for reduced motion, animations and transitions finish near-instantly and scrolling is not smoothed (fleet reduced-motion pass). Near-zero durations — not animation: none — so fade-ins still land on their end state and no content can be stranded invisible. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}