/* =========================================================
   ao8801.click - Mobile-first viewport stylesheet
   Class prefix: mobilebac4c-
   Palette: #262626 | #D3D3D3 | #95A5A6 | #2F2F2F
   Direction: rounded titles + compact body, mid-small radii,
   grouped cover cards, facts-then-detail rhythm, state-only
   motion, compact dual-button CTA group.
   ========================================================= */

:root {
  --mobilebac4c-bg: #262626;
  --mobilebac4c-bg-2: #2F2F2F;
  --mobilebac4c-bg-3: #353535;
  --mobilebac4c-bg-deep: #1d1d1d;
  --mobilebac4c-text: #D3D3D3;
  --mobilebac4c-text-strong: #F2F2F2;
  --mobilebac4c-muted: #95A5A6;
  --mobilebac4c-border: rgba(211, 211, 211, 0.14);
  --mobilebac4c-border-strong: rgba(211, 211, 211, 0.30);
  --mobilebac4c-card: #2F2F2F;
  --mobilebac4c-shadow: 0 8px 22px rgba(0, 0, 0, 0.42);
  --mobilebac4c-radius-sm: 6px;
  --mobilebac4c-radius: 10px;
  --mobilebac4c-radius-lg: 14px;
  --mobilebac4c-header-h: 56px;
  --mobilebac4c-bottomnav-h: 64px;
  --mobilebac4c-maxw: 430px;
  --mobilebac4c-pad: 14px;
  --mobilebac4c-tap: 44px;
  --mobilebac4c-transition: 180ms ease;
  --mobilebac4c-font-title: 'Quicksand', 'Nunito', 'Segoe UI', system-ui, -apple-system, Roboto, Arial, sans-serif;
  --mobilebac4c-font-body: 'Segoe UI', system-ui, -apple-system, Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--mobilebac4c-bg);
  color: var(--mobilebac4c-text);
  font-family: var(--mobilebac4c-font-body);
  font-size: 15px;
  line-height: 1.65;
  max-width: var(--mobilebac4c-maxw);
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  padding-top: var(--mobilebac4c-header-h);
  padding-bottom: calc(var(--mobilebac4c-bottomnav-h) + 16px);
}

img { max-width: 100%; display: block; }

a {
  color: var(--mobilebac4c-text);
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
}

ul, ol { list-style: none; }

:focus-visible {
  outline: 2px solid var(--mobilebac4c-muted);
  outline-offset: 2px;
}

/* ===== Top header (fixed) ===== */
.mobilebac4c-header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--mobilebac4c-maxw);
  height: var(--mobilebac4c-header-h);
  background: linear-gradient(180deg, #2F2F2F 0%, #262626 100%);
  border-bottom: 1px solid var(--mobilebac4c-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  gap: 8px;
  z-index: 100;
}

.mobilebac4c-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.mobilebac4c-brand-img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.45);
}
.mobilebac4c-brand-name {
  font-family: var(--mobilebac4c-font-title);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--mobilebac4c-text-strong);
  white-space: nowrap;
  line-height: 1;
}

.mobilebac4c-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.mobilebac4c-btn {
  min-height: 34px;
  padding: 0 12px;
  border-radius: var(--mobilebac4c-radius-sm);
  font-size: 13px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background var(--mobilebac4c-transition), color var(--mobilebac4c-transition), transform 0.12s ease, border-color var(--mobilebac4c-transition);
  white-space: nowrap;
}
.mobilebac4c-btn:active { transform: scale(0.95); }
.mobilebac4c-btn-ghost {
  color: var(--mobilebac4c-text);
  border: 1px solid var(--mobilebac4c-border-strong);
}
.mobilebac4c-btn-solid {
  background: var(--mobilebac4c-text);
  color: #262626;
}
.mobilebac4c-btn-solid:active { background: #F2F2F2; }
.mobilebac4c-btn-icon {
  min-height: 34px;
  min-width: 34px;
  padding: 0 8px;
  border-radius: var(--mobilebac4c-radius-sm);
  border: 1px solid var(--mobilebac4c-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--mobilebac4c-text);
}
.mobilebac4c-btn-icon:active { background: var(--mobilebac4c-bg-3); }
.mobilebac4c-btn-icon svg { width: 18px; height: 18px; display: block; }

/* ===== Drop-down menu ===== */
.mobilebac4c-menu {
  position: fixed;
  top: var(--mobilebac4c-header-h);
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--mobilebac4c-maxw);
  background: var(--mobilebac4c-bg-2);
  border-bottom: 1px solid var(--mobilebac4c-border);
  max-height: 0;
  overflow: hidden;
  transition: max-height 280ms ease;
  z-index: 99;
}
.mobilebac4c-menu.mobilebac4c-open {
  max-height: 82vh;
  overflow-y: auto;
  box-shadow: var(--mobilebac4c-shadow);
}
.mobilebac4c-menu-inner { padding: 12px 14px 18px; }
.mobilebac4c-menu-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--mobilebac4c-muted);
  margin: 12px 4px 6px;
  font-weight: 700;
}
.mobilebac4c-menu-title:first-child { margin-top: 4px; }
.mobilebac4c-menu-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.mobilebac4c-menu-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 10px;
  border-radius: var(--mobilebac4c-radius-sm);
  background: var(--mobilebac4c-bg);
  border: 1px solid var(--mobilebac4c-border);
  font-size: 13px;
  min-height: 40px;
  transition: background var(--mobilebac4c-transition), color var(--mobilebac4c-transition);
  color: var(--mobilebac4c-text);
}
.mobilebac4c-menu-link:active { background: var(--mobilebac4c-bg-3); }
.mobilebac4c-menu-link .mobilebac4c-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mobilebac4c-muted);
  flex-shrink: 0;
}
.mobilebac4c-menu-link[data-active="true"] {
  background: var(--mobilebac4c-bg-3);
  color: var(--mobilebac4c-text-strong);
}
.mobilebac4c-menu-link[data-active="true"] .mobilebac4c-dot {
  background: var(--mobilebac4c-text-strong);
}

/* ===== Hero carousel ===== */
.mobilebac4c-hero {
  margin: 12px 0 4px;
  padding: 0 var(--mobilebac4c-pad);
}
.mobilebac4c-carousel {
  position: relative;
  border-radius: var(--mobilebac4c-radius-lg);
  overflow: hidden;
  box-shadow: var(--mobilebac4c-shadow);
  background: var(--mobilebac4c-bg-2);
}
.mobilebac4c-carousel-track {
  display: flex;
  transition: transform 380ms ease;
  will-change: transform;
}
.mobilebac4c-hero-slide {
  min-width: 100%;
  position: relative;
  border: 0;
  background: var(--mobilebac4c-bg-2);
  padding: 0;
  display: block;
  text-align: left;
  width: 100%;
}
.mobilebac4c-hero-slide img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.mobilebac4c-hero-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 32px 14px 14px;
  background: linear-gradient(180deg, rgba(38,38,38,0) 0%, rgba(38,38,38,0.88) 70%);
  color: var(--mobilebac4c-text-strong);
}
.mobilebac4c-hero-caption strong {
  display: block;
  font-size: 15px;
  font-weight: 800;
  font-family: var(--mobilebac4c-font-title);
  line-height: 1.3;
}
.mobilebac4c-hero-caption span {
  font-size: 12px;
  color: var(--mobilebac4c-muted);
}
.mobilebac4c-carousel-dots {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}
.mobilebac4c-carousel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(211, 211, 211, 0.45);
  cursor: pointer;
  transition: background var(--mobilebac4c-transition), transform 0.12s ease;
  padding: 0;
}
.mobilebac4c-carousel-dot.mobilebac4c-active {
  background: var(--mobilebac4c-text-strong);
  transform: scale(1.15);
}

/* ===== Main layout ===== */
.mobilebac4c-main { padding: 0 var(--mobilebac4c-pad); }

.mobilebac4c-h1 {
  font-family: var(--mobilebac4c-font-title);
  font-size: 22px;
  font-weight: 800;
  color: var(--mobilebac4c-text-strong);
  line-height: 1.3;
  margin: 10px 0 8px;
}

.mobilebac4c-lead {
  color: var(--mobilebac4c-text);
  font-size: 14px;
  margin: 8px 0;
}
.mobilebac4c-p {
  margin: 8px 0;
  color: var(--mobilebac4c-text);
  font-size: 14px;
}

/* category chips */
.mobilebac4c-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0 4px;
}
.mobilebac4c-chip {
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--mobilebac4c-bg-2);
  border: 1px solid var(--mobilebac4c-border);
  font-size: 12px;
  color: var(--mobilebac4c-text);
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  font-weight: 600;
}
.mobilebac4c-chip:active { background: var(--mobilebac4c-bg-3); }

/* ===== Section + game grid ===== */
.mobilebac4c-section { margin: 22px 0; }
.mobilebac4c-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--mobilebac4c-border);
}
.mobilebac4c-section-head h2 {
  font-family: var(--mobilebac4c-font-title);
  font-size: 16px;
  font-weight: 800;
  color: var(--mobilebac4c-text-strong);
  line-height: 1.35;
}
.mobilebac4c-section-tag {
  font-size: 11px;
  color: var(--mobilebac4c-muted);
  white-space: nowrap;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-weight: 700;
}
.mobilebac4c-section-desc {
  font-size: 13px;
  color: var(--mobilebac4c-text);
  margin: 6px 0 10px;
}

.mobilebac4c-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.mobilebac4c-card {
  background: var(--mobilebac4c-bg-2);
  border: 1px solid var(--mobilebac4c-border);
  border-radius: var(--mobilebac4c-radius);
  padding: 5px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  transition: border-color var(--mobilebac4c-transition), transform 0.12s ease, background var(--mobilebac4c-transition);
  min-width: 0;
  text-align: center;
}
.mobilebac4c-card:active {
  transform: scale(0.97);
  border-color: var(--mobilebac4c-border-strong);
  background: var(--mobilebac4c-bg-3);
}
.mobilebac4c-card-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--mobilebac4c-radius-sm);
  background: var(--mobilebac4c-bg-deep);
}
.mobilebac4c-card-name {
  margin-top: 5px;
  font-size: 11px;
  line-height: 1.25;
  text-align: center;
  color: var(--mobilebac4c-text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 28px;
  font-weight: 600;
}

/* feature variant: 2-column grouped cover card */
.mobilebac4c-card.mobilebac4c-card-feature {
  grid-column: span 2;
  padding: 6px;
}
.mobilebac4c-card.mobilebac4c-card-feature .mobilebac4c-card-img {
  aspect-ratio: 4 / 3;
}
.mobilebac4c-card.mobilebac4c-card-feature .mobilebac4c-card-name {
  font-size: 13px;
  -webkit-line-clamp: 1;
  min-height: 0;
  margin-top: 6px;
}

/* ===== Content modules ===== */
.mobilebac4c-module {
  background: var(--mobilebac4c-bg-2);
  border: 1px solid var(--mobilebac4c-border);
  border-radius: var(--mobilebac4c-radius);
  padding: 14px;
  margin: 14px 0;
}
.mobilebac4c-module h2,
.mobilebac4c-module h3 {
  font-family: var(--mobilebac4c-font-title);
  color: var(--mobilebac4c-text-strong);
  line-height: 1.35;
}
.mobilebac4c-module h2 {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 6px;
}
.mobilebac4c-module h3 {
  font-size: 14px;
  font-weight: 700;
  margin: 12px 0 4px;
  color: var(--mobilebac4c-text-strong);
}
.mobilebac4c-module p {
  font-size: 14px;
  margin: 6px 0;
  color: var(--mobilebac4c-text);
}
.mobilebac4c-list { margin: 6px 0; }
.mobilebac4c-list li {
  position: relative;
  padding-left: 18px;
  margin: 6px 0;
  font-size: 13.5px;
  line-height: 1.55;
}
.mobilebac4c-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 9px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mobilebac4c-muted);
}
.mobilebac4c-list li strong { color: var(--mobilebac4c-text-strong); }

.mobilebac4c-inline-link {
  color: var(--mobilebac4c-text-strong);
  border-bottom: 1px dashed var(--mobilebac4c-muted);
  padding-bottom: 1px;
}
.mobilebac4c-inline-link:active { background: var(--mobilebac4c-bg-3); }

.mobilebac4c-promo-link {
  color: var(--mobilebac4c-text-strong);
  font-weight: 700;
  border-bottom: 1px solid var(--mobilebac4c-muted);
}

/* direct answer box */
.mobilebac4c-answer {
  background: var(--mobilebac4c-bg-2);
  border: 1px solid var(--mobilebac4c-border);
  border-left: 3px solid var(--mobilebac4c-text);
  border-radius: var(--mobilebac4c-radius);
  padding: 14px;
  margin: 14px 0;
}
.mobilebac4c-answer h2 {
  font-family: var(--mobilebac4c-font-title);
  font-size: 16px;
  font-weight: 800;
  color: var(--mobilebac4c-text-strong);
  margin-bottom: 6px;
  line-height: 1.35;
}
.mobilebac4c-answer p { font-size: 14px; margin: 6px 0; }
.mobilebac4c-answer strong { color: var(--mobilebac4c-text-strong); }

/* payment grid */
.mobilebac4c-pay-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}
.mobilebac4c-pay {
  background: var(--mobilebac4c-bg);
  border: 1px solid var(--mobilebac4c-border);
  border-radius: var(--mobilebac4c-radius-sm);
  padding: 10px;
}
.mobilebac4c-pay strong {
  display: block;
  font-size: 13px;
  color: var(--mobilebac4c-text-strong);
  font-weight: 700;
}
.mobilebac4c-pay span {
  font-size: 12px;
  color: var(--mobilebac4c-muted);
  display: block;
  margin-top: 2px;
}

/* takeaways */
.mobilebac4c-takeaways {
  display: grid;
  gap: 6px;
  margin-top: 8px;
}
.mobilebac4c-takeaway {
  background: var(--mobilebac4c-bg);
  border-left: 3px solid var(--mobilebac4c-muted);
  padding: 9px 11px;
  border-radius: 4px;
  font-size: 13px;
  line-height: 1.5;
}
.mobilebac4c-takeaway strong { color: var(--mobilebac4c-text-strong); }

/* CTA cluster (compact dual-button group) */
.mobilebac4c-cta-row {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.mobilebac4c-cta-row .mobilebac4c-btn { flex: 1 1 auto; min-height: 40px; }

/* ===== Extended footer ===== */
.mobilebac4c-extended {
  margin: 26px 0 10px;
  padding: 16px;
  background: var(--mobilebac4c-bg-2);
  border: 1px solid var(--mobilebac4c-border);
  border-radius: var(--mobilebac4c-radius-lg);
}
.mobilebac4c-extended-brand p {
  font-size: 13px;
  color: var(--mobilebac4c-muted);
  line-height: 1.6;
}
.mobilebac4c-extended h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--mobilebac4c-muted);
  margin: 16px 0 8px;
  font-weight: 700;
}
.mobilebac4c-extended-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px 10px;
}
.mobilebac4c-extended-list a {
  font-size: 12.5px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--mobilebac4c-border);
  color: var(--mobilebac4c-text);
}
.mobilebac4c-extended-list a:active { color: var(--mobilebac4c-text-strong); }
.mobilebac4c-promo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.mobilebac4c-promo-item {
  padding: 10px;
  background: var(--mobilebac4c-bg);
  border: 1px solid var(--mobilebac4c-border);
  border-radius: var(--mobilebac4c-radius-sm);
  font-size: 12px;
  text-align: center;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--mobilebac4c-text-strong);
  transition: background var(--mobilebac4c-transition), transform 0.12s ease;
}
.mobilebac4c-promo-item:active {
  background: var(--mobilebac4c-bg-3);
  transform: scale(0.97);
}
.mobilebac4c-disclaimer {
  margin-top: 14px;
  font-size: 11px;
  color: var(--mobilebac4c-muted);
  line-height: 1.55;
}

/* ===== Common footer ===== */
.mobilebac4c-footer {
  padding: 14px var(--mobilebac4c-pad);
  text-align: center;
  color: var(--mobilebac4c-muted);
  font-size: 12px;
  border-top: 1px solid var(--mobilebac4c-border);
  margin-top: 8px;
  line-height: 1.6;
}
.mobilebac4c-footer strong { color: var(--mobilebac4c-text); }

/* ===== Bottom navigation rail ===== */
.mobilebac4c-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--mobilebac4c-maxw);
  height: var(--mobilebac4c-bottomnav-h);
  background: linear-gradient(0deg, #2F2F2F 0%, #262626 100%);
  border-top: 1px solid var(--mobilebac4c-border);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  z-index: 100;
}
.mobilebac4c-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 6px 2px 4px;
  color: var(--mobilebac4c-muted);
  font-size: 10px;
  position: relative;
  min-height: var(--mobilebac4c-tap);
  transition: color var(--mobilebac4c-transition);
  font-weight: 600;
}
.mobilebac4c-nav-item svg {
  width: 20px;
  height: 20px;
  display: block;
}
.mobilebac4c-nav-item:active { color: var(--mobilebac4c-text-strong); }
.mobilebac4c-nav-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: transparent;
  border-radius: 0 0 2px 2px;
  transition: background var(--mobilebac4c-transition);
}
.mobilebac4c-nav-item[data-active="true"] {
  color: var(--mobilebac4c-text-strong);
}
.mobilebac4c-nav-item[data-active="true"]::before {
  background: var(--mobilebac4c-text-strong);
}
.mobilebac4c-nav-item span { line-height: 1; }

/* ===== Responsive tuning ===== */
@media (min-width: 375px) {
  body { font-size: 15.5px; }
  .mobilebac4c-grid { gap: 10px; }
  .mobilebac4c-card-name { font-size: 12px; }
  .mobilebac4c-section-head h2 { font-size: 17px; }
  .mobilebac4c-h1 { font-size: 23px; }
}
@media (min-width: 414px) {
  .mobilebac4c-grid { gap: 12px; }
}
@media (min-width: 430px) {
  .mobilebac4c-h1 { font-size: 24px; }
}
@media (max-width: 359px) {
  body { font-size: 14px; }
  .mobilebac4c-grid { gap: 6px; }
  .mobilebac4c-card { padding: 4px; }
  .mobilebac4c-card-name { font-size: 10.5px; min-height: 26px; }
  .mobilebac4c-brand-name { font-size: 16px; }
  .mobilebac4c-btn { padding: 0 10px; font-size: 12px; min-height: 32px; }
  .mobilebac4c-btn-icon { min-width: 32px; min-height: 32px; padding: 0 6px; }
  .mobilebac4c-header { padding: 0 10px; gap: 6px; }
  .mobilebac4c-actions { gap: 5px; }
  .mobilebac4c-promo-grid { grid-template-columns: 1fr; }
  .mobilebac4c-pay-row { grid-template-columns: 1fr; }
}

/* honor reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
    scroll-behavior: auto !important;
  }
}