/* =========================
   Global Reset & Base
========================= */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  min-height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  background: #f6f7fb;
  color: #111827;
  line-height: 1.6;
  position: relative;
}

/* =========================
   Bingo Blitz Background
========================= */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: url("/images/bb-background.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.18; /* translucent effect */
  z-index: -1;
}

/* =========================
   Layout Container
========================= */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* =========================
   Page Headings
========================= */
h1 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 0.5rem;
}

.subtitle {
  text-align: center;
  color: #6b7280;
  margin-bottom: 3rem;
}

/* =========================
   Grid (Cards)
========================= */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

/* =========================
   Cards
========================= */
.card {
  display: block;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 16px;
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  border: 2px solid #e5e7eb;
  transition: all 0.25s ease;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}

.card:hover {
  transform: translateY(-6px);
  border-color: #6366f1;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: #6b7280;
  font-size: 0.95rem;
}

/* =========================
   Bingo Blitz Reward Box
========================= */
.reward-box {
  max-width: 720px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.reward-box h2 {
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
}

.reward-box ul {
  list-style: disc;
  padding-left: 1.5rem;
}

.reward-box li {
  margin-bottom: 0.75rem;
}

.reward-box a {
  color: #2563eb;
  font-weight: 500;
  text-decoration: none;
}

.reward-box a:hover {
  text-decoration: underline;
}

/* =========================
   Back Link
========================= */
.back-link {
  text-align: center;
  margin-top: 3rem;
}

.back-link a {
  color: #2563eb;
  text-decoration: none;
}

.back-link a:hover {
  text-decoration: underline;
}

/* =========================
   Footer
========================= */
footer {
  text-align: center;
  padding: 3rem 1rem 2rem;
  font-size: 0.85rem;
  color: #6b7280;
}