/* ============================================================
 * 558h bet - shell-b12bc8.css
 * Mobile-first shell for 320-430px phone canvas.
 * All class names use the sb12- prefix.
 * Comments are in English per project convention.
 * Palette: #2E4057 | #008B8B | #FF7F50 | #AFEEEE | #E0F2F1
 * ============================================================ */

:root {
  --sb12-bg-deep: #2E4057;
  --sb12-bg-mid: #243a4f;
  --sb12-bg-soft: #34495f;
  --sb12-accent: #008B8B;
  --sb12-accent-2: #16a6a6;
  --sb12-coral: #FF7F50;
  --sb12-coral-soft: #ff936b;
  --sb12-mint: #AFEEEE;
  --sb12-mist: #E0F2F1;
  --sb12-text: #eaf6f5;
  --sb12-text-muted: #9fc4c2;
  --sb12-border: rgba(175, 238, 238, 0.18);
  --sb12-shadow: 0 8px 22px rgba(0, 0, 0, 0.28);
  --sb12-radius: 14px;
  --sb12-radius-sm: 10px;
  --sb12-maxw: 480px;
  --sb12-header-h: 56px;
  --sb12-bottomnav-h: 64px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--sb12-bg-deep);
  color: var(--sb12-text);
  font-family: "Hind Siliguri", "Noto Sans Bengali", "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

body {
  max-width: var(--sb12-maxw);
  margin: 0 auto;
  min-height: 100vh;
  position: relative;
  background:
    radial-gradient(circle at 0% 0%, rgba(0, 139, 139, 0.25), transparent 55%),
    radial-gradient(circle at 100% 12%, rgba(255, 127, 80, 0.12), transparent 60%),
    var(--sb12-bg-deep);
  padding-bottom: calc(var(--sb12-bottomnav-h) + 18px);
  overflow-x: hidden;
}

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

a { color: var(--sb12-mint); text-decoration: none; }
a:hover, a:focus { color: var(--sb12-coral-soft); }

.sb12-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap;
}

/* ------------------------------------------------------------
 * Header / brand action bar
 * ------------------------------------------------------------ */
.sb12-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--sb12-header-h);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  background: linear-gradient(135deg, rgba(46, 64, 87, 0.96), rgba(0, 90, 90, 0.92));
  border-bottom: 1px solid var(--sb12-border);
  backdrop-filter: blur(10px);
}

.sb12-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 auto;
  min-width: 0;
}
.sb12-logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  object-fit: cover;
  border: 1px solid var(--sb12-mint);
  flex: 0 0 auto;
}
.sb12-brand-name {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.3px;
  color: var(--sb12-mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sb12-brand-name span { color: var(--sb12-coral); }

.sb12-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}
.sb12-btn {
  -webkit-appearance: none;
  appearance: none;
  border: none;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  padding: 9px 14px;
  border-radius: 22px;
  cursor: pointer;
  min-height: 36px;
  min-width: 44px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.sb12-btn-login {
  background: transparent;
  color: var(--sb12-mist);
  border: 1px solid var(--sb12-border);
}
.sb12-btn-register {
  background: linear-gradient(135deg, var(--sb12-coral), var(--sb12-coral-soft));
  color: #2a1a12;
  box-shadow: 0 4px 12px rgba(255, 127, 80, 0.35);
}
.sb12-btn:hover { transform: translateY(-1px); }
.sb12-btn:active { transform: translateY(0); }

.sb12-menu-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: rgba(175, 238, 238, 0.10);
  border: 1px solid var(--sb12-border);
  color: var(--sb12-mint);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.sb12-menu-btn:hover { background: rgba(175, 238, 238, 0.18); }
.sb12-menu-btn svg { width: 20px; height: 20px; }

/* ------------------------------------------------------------
 * Route panel (compact slide-down)
 * ------------------------------------------------------------ */
.sb12-route-panel {
  position: fixed;
  top: var(--sb12-header-h);
  left: 50%;
  transform: translate(-50%, -12px);
  width: 100%;
  max-width: var(--sb12-maxw);
  background: rgba(28, 46, 64, 0.98);
  border-bottom: 1px solid var(--sb12-border);
  padding: 12px 14px 16px;
  z-index: 49;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  box-shadow: var(--sb12-shadow);
}
.sb12-route-panel.sb12-is-open {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}
.sb12-route-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--sb12-text-muted);
  margin: 4px 0 8px;
}
.sb12-route-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.sb12-route-link {
  display: block;
  padding: 9px 10px;
  background: rgba(0, 139, 139, 0.18);
  border: 1px solid var(--sb12-border);
  border-radius: 10px;
  font-size: 12.5px;
  color: var(--sb12-mist);
  text-align: center;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sb12-route-link:hover {
  background: rgba(0, 139, 139, 0.32);
  color: var(--sb12-coral-soft);
}

/* ------------------------------------------------------------
 * Main / hero
 * ------------------------------------------------------------ */
.sb12-main { padding: 14px 12px 4px; }

.sb12-hero-card {
  position: relative;
  border-radius: var(--sb12-radius);
  padding: 14px;
  background: linear-gradient(135deg, rgba(0, 139, 139, 0.30), rgba(46, 64, 87, 0.55));
  border: 1px solid var(--sb12-border);
  margin-bottom: 12px;
}
.sb12-eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  color: #2a1a12;
  background: var(--sb12-coral);
  padding: 3px 9px;
  border-radius: 20px;
  margin-bottom: 8px;
}
.sb12-hero-card h1 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.35;
  color: var(--sb12-mist);
}
.sb12-hero-card h1 em {
  font-style: normal;
  color: var(--sb12-coral);
}
.sb12-hero-card p {
  margin: 0 0 12px;
  color: var(--sb12-text-muted);
  font-size: 14px;
}
.sb12-cta-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.sb12-cta {
  flex: 1 1 auto;
  text-align: center;
  background: linear-gradient(135deg, var(--sb12-coral), var(--sb12-coral-soft));
  color: #2a1a12;
  font-weight: 800;
  padding: 11px 16px;
  border-radius: 24px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  min-height: 44px;
}
.sb12-cta.sb12-cta-ghost {
  background: transparent;
  color: var(--sb12-mist);
  border: 1px solid var(--sb12-border);
}

/* ------------------------------------------------------------
 * Carousel
 * ------------------------------------------------------------ */
.sb12-carousel {
  position: relative;
  border-radius: var(--sb12-radius);
  overflow: hidden;
  margin-bottom: 14px;
  box-shadow: var(--sb12-shadow);
}
.sb12-carousel-viewport { overflow: hidden; }
.sb12-carousel-track {
  display: flex;
  transition: transform 0.45s ease;
}
.sb12-slide {
  flex: 0 0 100%;
  position: relative;
  display: block;
}
.sb12-slide img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  border: 0;
}
.sb12-slide-overlay {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 12px;
  background: linear-gradient(0deg, rgba(20, 32, 46, 0.92), rgba(20, 32, 46, 0));
  color: var(--sb12-mist);
}
.sb12-slide-overlay strong {
  display: block;
  font-size: 15px;
  color: var(--sb12-coral-soft);
  margin-bottom: 2px;
}
.sb12-slide-overlay span {
  font-size: 12.5px;
  color: var(--sb12-text-muted);
}
.sb12-carousel-dots {
  position: absolute;
  bottom: 8px;
  right: 12px;
  display: flex;
  gap: 6px;
}
.sb12-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(175, 238, 238, 0.45);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.sb12-dot.sb12-dot-active {
  background: var(--sb12-coral);
  transform: scale(1.25);
}

/* ------------------------------------------------------------
 * Section shell
 * ------------------------------------------------------------ */
.sb12-section {
  margin: 16px 0 6px;
}
.sb12-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 0 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--sb12-border);
}
.sb12-section-head h2 {
  margin: 0;
  font-size: 17px;
  color: var(--sb12-mist);
}
.sb12-section-head h2 mark {
  background: transparent;
  color: var(--sb12-coral);
}
.sb12-section-head .sb12-more {
  font-size: 12px;
  color: var(--sb12-mint);
}
.sb12-section-intro {
  margin: 0 0 10px;
  color: var(--sb12-text-muted);
  font-size: 13.5px;
}

/* ------------------------------------------------------------
 * Game grid (4 cols at 320, 4-5 at 375-430)
 * ------------------------------------------------------------ */
.sb12-game-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
@media (min-width: 360px) {
  .sb12-game-grid { gap: 9px; }
}
@media (min-width: 400px) {
  .sb12-game-grid { grid-template-columns: repeat(5, 1fr); }
}

.sb12-game-card {
  display: block;
  background: rgba(0, 139, 139, 0.12);
  border: 1px solid var(--sb12-border);
  border-radius: var(--sb12-radius-sm);
  padding: 5px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
  min-width: 0;
}
.sb12-game-card:hover,
.sb12-game-card:focus {
  transform: translateY(-2px);
  background: rgba(0, 139, 139, 0.24);
  border-color: var(--sb12-coral);
  color: var(--sb12-mist);
}
.sb12-game-thumb {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 8px;
  background: #1c2e40;
}
.sb12-game-name {
  margin-top: 5px;
  font-size: 11px;
  font-weight: 600;
  color: var(--sb12-mist);
  line-height: 1.25;
  min-height: 28px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Chip row (horizontal shortcut) */
.sb12-chip-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}
.sb12-chip-row::-webkit-scrollbar { height: 4px; }
.sb12-chip {
  flex: 0 0 auto;
  scroll-snap-align: start;
  background: rgba(0, 139, 139, 0.16);
  border: 1px solid var(--sb12-border);
  color: var(--sb12-mist);
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}
.sb12-chip:hover { background: rgba(0, 139, 139, 0.32); color: var(--sb12-coral-soft); }

/* ------------------------------------------------------------
 * Content blocks (How to Play, What is, Promotions)
 * ------------------------------------------------------------ */
.sb12-prose {
  background: rgba(28, 46, 64, 0.55);
  border: 1px solid var(--sb12-border);
  border-radius: var(--sb12-radius);
  padding: 14px;
  margin: 10px 0;
}
.sb12-prose h3 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--sb12-coral-soft);
}
.sb12-prose p {
  margin: 0 0 10px;
  color: var(--sb12-text);
  font-size: 14px;
}
.sb12-prose p:last-child { margin-bottom: 0; }
.sb12-prose ul {
  margin: 6px 0 0;
  padding-left: 18px;
}
.sb12-prose li { margin-bottom: 4px; font-size: 13.5px; color: var(--sb12-text); }

.sb12-step-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 8px;
}
.sb12-step {
  background: rgba(0, 139, 139, 0.14);
  border: 1px solid var(--sb12-border);
  border-radius: var(--sb12-radius-sm);
  padding: 10px;
}
.sb12-step-num {
  display: inline-block;
  width: 22px; height: 22px;
  line-height: 22px;
  text-align: center;
  border-radius: 50%;
  background: var(--sb12-coral);
  color: #2a1a12;
  font-weight: 800;
  font-size: 12px;
  margin-bottom: 5px;
}
.sb12-step strong { display: block; color: var(--sb12-mist); font-size: 13px; }
.sb12-step span { color: var(--sb12-text-muted); font-size: 12px; }

/* ------------------------------------------------------------
 * Extended footer
 * ------------------------------------------------------------ */
.sb12-ext-footer {
  margin: 22px 12px 18px;
  padding: 16px;
  background: rgba(28, 46, 64, 0.72);
  border: 1px solid var(--sb12-border);
  border-radius: var(--sb12-radius);
}
.sb12-ext-footer h2 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--sb12-mist);
}
.sb12-ext-footer h2 mark { background: transparent; color: var(--sb12-coral); }
.sb12-brand-blurb {
  font-size: 13px;
  color: var(--sb12-text-muted);
  margin: 0 0 12px;
}
.sb12-ext-block-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--sb12-mint);
  margin: 12px 0 6px;
}
.sb12-link-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.sb12-link-list li a {
  display: block;
  padding: 7px 10px;
  background: rgba(0, 139, 139, 0.14);
  border: 1px solid var(--sb12-border);
  border-radius: 9px;
  font-size: 12.5px;
  color: var(--sb12-mist);
}
.sb12-link-list li a:hover { color: var(--sb12-coral-soft); }

.sb12-promo-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 6px;
}
.sb12-promo-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid var(--sb12-border);
  background: rgba(255, 127, 80, 0.10);
  cursor: pointer;
  min-height: 44px;
}
.sb12-promo-card:hover { background: rgba(255, 127, 80, 0.20); }
.sb12-promo-card strong { font-size: 13px; color: var(--sb12-coral-soft); }
.sb12-promo-card span { font-size: 11.5px; color: var(--sb12-text-muted); }

.sb12-disclaimer {
  margin-top: 14px;
  padding: 10px;
  border-left: 3px solid var(--sb12-coral);
  background: rgba(255, 127, 80, 0.06);
  font-size: 11.5px;
  color: var(--sb12-text-muted);
  border-radius: 4px;
}

.sb12-copyright {
  margin: 14px 12px 4px;
  text-align: center;
  font-size: 11.5px;
  color: var(--sb12-text-muted);
}
.sb12-copyright a { color: var(--sb12-mint); }

/* ------------------------------------------------------------
 * Bottom navigation (compact icon rack with sliding underline)
 * ------------------------------------------------------------ */
.sb12-bottomnav {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 100%;
  max-width: var(--sb12-maxw);
  height: var(--sb12-bottomnav-h);
  background: linear-gradient(180deg, rgba(28, 46, 64, 0.96), rgba(20, 32, 46, 0.99));
  border-top: 1px solid var(--sb12-border);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  z-index: 48;
  backdrop-filter: blur(10px);
}
.sb12-bottomnav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  color: var(--sb12-text-muted);
  font-size: 10.5px;
  font-weight: 600;
  padding: 6px 2px 4px;
  min-height: 44px;
  cursor: pointer;
}
.sb12-bottomnav-link svg {
  width: 22px;
  height: 22px;
}
.sb12-bottomnav-link::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--sb12-coral);
  transition: width 0.25s ease;
}
.sb12-bottomnav-link:hover { color: var(--sb12-mint); }
.sb12-bottomnav-active { color: var(--sb12-coral-soft) !important; }
.sb12-bottomnav-active::after { width: 22px; }
.sb12-bottomnav-link[aria-current="page"] { color: var(--sb12-coral-soft); }
.sb12-bottomnav-link[aria-current="page"]::after { width: 22px; }

/* ------------------------------------------------------------
 * Utility
 * ------------------------------------------------------------ */
.sb12-to-top {
  position: fixed;
  right: 14px;
  bottom: calc(var(--sb12-bottomnav-h) + 12px);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--sb12-accent);
  color: var(--sb12-mist);
  border: 1px solid var(--sb12-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 47;
  box-shadow: var(--sb12-shadow);
}
.sb12-to-top:hover { background: var(--sb12-accent-2); }

.sb12-focusable:focus-visible {
  outline: 2px solid var(--sb12-coral);
  outline-offset: 2px;
}