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

body {
  font-family: 'Georgia', serif;
  background: #F5F5F7;
  color: #1a1a1a;
  line-height: 1.5;
}

.hero {
  background: #0D1117;
  color: #fff;
  padding: 64px 24px 52px;
}
.hero-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}
.hero-org {
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #666;
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(3.5rem, 9vw, 6.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 40%, #888888);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-tagline {
  font-size: 1.1rem;
  color: #bbb;
  max-width: 600px;
  margin: 0 auto 40px;
}
.hero-rules {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.rule {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 16px 18px;
  text-align: left;
  max-width: 230px;
}
.rule-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.rule strong { display: block; margin-bottom: 4px; font-size: 0.9rem; color: #fff; }
.rule p { font-size: 0.8rem; color: #999; }
.hero-suits {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.suit-pill {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 6px 18px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}
.suit-pill.spades   { background: #1B2A6B; color: #E8EBFF; }
.suit-pill.hearts   { background: #8B1A1A; color: #FFE8E8; }
.suit-pill.diamonds { background: #C17900; color: #FFF8E1; }
.suit-pill.clubs    { background: #1B5E20; color: #E8F5E9; }

.suit-section {
  max-width: 1400px;
  margin: 48px auto;
  padding: 0 24px;
}
.suit-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--suit-color);
}
.suit-symbol { font-size: 2.2rem; color: var(--suit-color); line-height: 1; }
.suit-name   { font-size: 1.7rem; font-weight: 700; color: var(--suit-color); }
.suit-sub    { font-size: 0.95rem; color: #777; font-style: italic; flex: 1; }
.show-all-btn {
  margin-left: auto;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border: 2px solid var(--suit-color);
  border-radius: 999px;
  background: transparent;
  color: var(--suit-color);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.show-all-btn:hover {
  background: var(--suit-color);
  color: #fff;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(175px, 1fr));
  gap: 14px;
  align-items: start;
}
.card {
  border-radius: 12px;
  aspect-ratio: 2.5 / 3.5;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
  position: relative;
}

/* Ace card (always face-up, no flip) */
.card.ace {
  background: var(--suit-color);
  border: 2.5px solid var(--suit-color);
  display: flex;
  flex-direction: column;
  padding: 12px 10px 14px;
}
.card.ace .card-rank { color: rgba(255,255,255,0.7); }
.card.ace .card-body { color: rgba(255,255,255,0.95); }
.ace-name {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: #fff;
}

/* Flippable question cards */
.card.question {
  cursor: pointer;
  perspective: 800px;
  background: transparent;
  border: none;
}
.card.question:hover .card-inner {
  box-shadow: 0 10px 24px rgba(0,0,0,0.15);
}
.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}
.card.question.face-up .card-inner {
  transform: rotateY(180deg);
}
.card-front,
.card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
}
.card-back {
  background: var(--suit-color);
  align-items: center;
  justify-content: center;
  gap: 6px;
  opacity: 0.88;
}
.card-back-symbol {
  font-size: 3.5rem;
  color: rgba(255,255,255,0.2);
  line-height: 1;
}
.card-back-label {
  font-size: 0.6rem;
  color: rgba(255,255,255,0.35);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.card-front {
  transform: rotateY(180deg);
  background: #fff;
  border: 2.5px solid var(--suit-color);
  padding: 12px 10px 14px;
}

.card-rank {
  font-size: 1rem;
  font-weight: 700;
  color: var(--suit-color);
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.card-rank .sym { font-size: 0.8rem; }
.card-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: 0.75rem;
  line-height: 1.45;
  color: #222;
  padding: 6px 2px;
}
.site-footer {
  text-align: center;
  padding: 32px 24px;
  font-size: 0.78rem;
  color: #aaa;
  border-top: 1px solid #ddd;
  margin-top: 32px;
}