/* Add as app — install guide page (Railroading with JM dark theme) */
:root {
  --aaa-bg: #0b1120;
  --aaa-surface: rgba(17, 19, 27, 0.92);
  --aaa-border: #2a3140;
  --aaa-text: #cfd8dc;
  --aaa-muted: #90a4ae;
  --aaa-blue: #4fc3f7;
  --aaa-yellow: #ffeb3b;
  --aaa-yellow-soft: #fff59d;
  --aaa-panel: #121620;
  --aaa-highlight: rgba(255, 235, 59, 0.18);
  --aaa-radius: 14px;
}

body.aaa-body {
  margin: 0;
  /* Content-sized height only — min-height:100vh created extra mobile scroll canvas. */
  min-height: 0;
  font-family: "Source Sans 3", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background:
    radial-gradient(120% 90% at 50% -10%, #1a2748 0%, transparent 55%),
    radial-gradient(80% 60% at 100% 40%, rgba(79, 195, 247, 0.08) 0%, transparent 50%),
    linear-gradient(180deg, #0e1528 0%, var(--aaa-bg) 45%, #070b14 100%);
  color: var(--aaa-text);
}

.aaa-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.75rem 1rem 1rem;
  box-sizing: border-box;
}

.aaa-hero {
  margin: 0.5rem 0 1.75rem;
  padding: 1.5rem 0 0.5rem;
}

.aaa-brand-icon {
  display: block;
  width: 4.5rem;
  height: 4.5rem;
  margin: 0 0 1rem;
  border-radius: 1rem;
  background: #000;
  object-fit: contain;
}

.aaa-eyebrow {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  font-weight: 800;
  color: var(--aaa-yellow);
  margin: 0 0 0.65rem;
}

.aaa-hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.55rem, 4.2vw, 2.15rem);
  line-height: 1.15;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.01em;
  max-width: 18ch;
}

.aaa-hero-lead {
  margin: 0;
  max-width: 38rem;
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--aaa-muted);
}

.aaa-panel {
  background: var(--aaa-surface);
  border: 1px solid var(--aaa-border);
  border-radius: var(--aaa-radius);
  padding: 1.15rem 1.2rem 1.25rem;
  margin: 0 0 1.35rem;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.28);
}

.aaa-panel h2 {
  margin: 0 0 0.65rem;
  font-size: 1.2rem;
  color: #fff;
}

.aaa-success {
  border-color: rgba(255, 235, 59, 0.45);
  background: linear-gradient(180deg, rgba(255, 235, 59, 0.08), var(--aaa-surface));
}

.aaa-success p {
  margin: 0;
  color: var(--aaa-yellow-soft);
  font-weight: 600;
  font-size: 1.05rem;
}

.aaa-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1rem;
}

.aaa-tab {
  appearance: none;
  border: 1px solid var(--aaa-border);
  background: var(--aaa-panel);
  color: var(--aaa-blue);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.aaa-tab:hover,
.aaa-tab:focus-visible {
  color: #fff;
  border-color: #4a5568;
  outline: none;
}

.aaa-tab[aria-selected="true"] {
  background: var(--aaa-yellow);
  color: #0b1120;
  border-color: var(--aaa-yellow);
}

.aaa-platform {
  display: none;
}

.aaa-platform.is-active {
  display: block;
}

/* Inactive / hidden platforms must never contribute layout or scroll height. */
.aaa-platform:not(.is-active),
.aaa-platform[hidden] {
  display: none !important;
}

.aaa-install-cta {
  display: none;
  margin: 0 0 1rem;
}

.aaa-install-cta.is-visible {
  display: block;
}

.aaa-btn {
  appearance: none;
  border: 1px solid rgba(251, 191, 36, 0.95);
  background: linear-gradient(180deg, #ffb44f, #fea435);
  color: #0b1120;
  font-weight: 800;
  font-size: 1rem;
  padding: 0.7rem 1.25rem;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(254, 164, 53, 0.22);
}

.aaa-btn:hover,
.aaa-btn:focus-visible {
  background: linear-gradient(180deg, #ffbf67, #ffad42);
  outline: none;
}

.aaa-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.aaa-btn-secondary {
  background: transparent;
  border: 1px solid var(--aaa-border);
  color: var(--aaa-blue);
  box-shadow: none;
  font-weight: 700;
}

.aaa-btn-secondary:hover,
.aaa-btn-secondary:focus-visible {
  color: #fff;
  border-color: #5a6578;
  background: rgba(255, 255, 255, 0.04);
}

.aaa-status {
  margin: 0.65rem 0 0;
  min-height: 1.35em;
  font-size: 0.95rem;
  color: var(--aaa-muted);
}

.aaa-status.is-ok {
  color: #a5d6a7;
}

.aaa-status.is-warn {
  color: var(--aaa-yellow-soft);
}

.aaa-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.aaa-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.75rem 0.85rem;
  background: var(--aaa-panel);
  border: 1px solid var(--aaa-border);
  border-radius: 12px;
}

.aaa-step-num {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  background: var(--aaa-yellow);
  color: #0b1120;
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.aaa-step p {
  margin: 0;
  line-height: 1.45;
  color: var(--aaa-text);
}

.aaa-illus {
  margin: 1rem 0 0.25rem;
  border-radius: 12px;
  border: 1px solid var(--aaa-border);
  background: #0a0e18;
  overflow: hidden;
  padding: 0.85rem;
}

.aaa-illus svg {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 0 auto;
}

.aaa-note {
  margin: 0.85rem 0 0;
  font-size: 0.92rem;
  color: var(--aaa-muted);
  line-height: 1.45;
}

.aaa-benefits {
  display: grid;
  gap: 0.75rem;
}

@media (min-width: 720px) {
  .aaa-benefits {
    grid-template-columns: repeat(3, 1fr);
  }
}

.aaa-benefit {
  padding: 0.9rem 1rem;
  background: var(--aaa-panel);
  border: 1px solid var(--aaa-border);
  border-radius: 12px;
}

.aaa-benefit h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  color: var(--aaa-yellow);
}

.aaa-benefit p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--aaa-muted);
  line-height: 1.45;
}

.aaa-continue {
  margin: 0.25rem 0 1.5rem;
}

.aaa-faq {
  margin-bottom: 0;
}

.aaa-faq details {
  border: 1px solid var(--aaa-border);
  border-radius: 10px;
  background: var(--aaa-panel);
  margin: 0 0 0.55rem;
  padding: 0.65rem 0.9rem;
}

.aaa-faq details:last-child {
  margin-bottom: 0;
}

/* Closed FAQ answers must not participate in layout (some engines still size them). */
.aaa-faq details:not([open]) > *:not(summary) {
  display: none !important;
}

.aaa-faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--aaa-blue);
  list-style: none;
}

.aaa-faq summary::-webkit-details-marker {
  display: none;
}

.aaa-faq summary::before {
  content: "+";
  display: inline-block;
  width: 1.1rem;
  color: var(--aaa-yellow);
  font-weight: 800;
}

.aaa-faq details[open] summary::before {
  content: "−";
}

.aaa-faq details p {
  margin: 0.55rem 0 0.2rem;
  color: var(--aaa-muted);
  line-height: 1.5;
  font-size: 0.95rem;
}

/* Illustration highlight pulse (restrained) */
.aaa-hl {
  transition: opacity 0.35s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .aaa-platform.is-active .aaa-hl-pulse {
    animation: aaa-pulse 2.4s ease-in-out infinite;
  }
}

@keyframes aaa-pulse {
  0%,
  100% {
    opacity: 0.55;
  }
  50% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .aaa-tab,
  .aaa-btn {
    transition: none;
  }
  .aaa-hl-pulse {
    animation: none !important;
    opacity: 1;
  }
}

@media (max-width: 430px) {
  .aaa-shell {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }
  .aaa-hero h1 {
    max-width: none;
  }
}