:root{
  --bg:#0b0f1a;
  --card-w: 170px;
  --card-h: 270px;
  --accent:#d4b36a;
  --text:#e9ecf2;
  --muted:#a7b0c0;
  --glass: rgba(255,255,255,0.06);
  --glass-brd: rgba(255,255,255,0.12);
  --shadow: 0 12px 24px rgba(0,0,0,0.35);
}

*{box-sizing:border-box}

html,body{
  height:100%;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans Thai", "Tahoma", sans-serif;
}

#starfield{
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(1200px 800px at 20% 10%, rgba(212,179,106,0.08), transparent 60%),
              radial-gradient(1000px 600px at 80% 80%, rgba(106,149,212,0.07), transparent 60%),
              #060913;
}

.container{
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(16px, 3vw, 32px);
}

.page-header{
  text-align: center;
  margin-bottom: 20px;
}

h1{
  font-weight: 700;
  letter-spacing: .5px;
  margin: 0 0 8px;
}

.subtitle{
  margin: 0 auto;
  max-width: 680px;
  color: var(--muted);
}

/* โต๊ะไพ่ */
.deck{
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: clamp(10px, 2vw, 20px);
  justify-items: center;
  margin: 24px auto;
  padding: clamp(12px, 2vw, 20px);
  border: 1px solid var(--glass-brd);
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  backdrop-filter: blur(6px);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

@media (max-width: 900px){
  .deck{ grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 520px){
  .deck{ grid-template-columns: repeat(2, 1fr); }
}

/* ไพ่ + แอนิเมชันพลิก */
.card{
  width: var(--card-w);
  height: var(--card-h);
  perspective: 1000px;
  border: 0;
  background: transparent;
  padding: 0;
  cursor: pointer;
  position: relative;
  transition: transform .2s ease;
}
.card:focus-visible{ outline: 2px dashed var(--accent); outline-offset: 4px; }
.card[aria-disabled="true"]{ cursor: not-allowed; opacity: .5; }

.card-inner{
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .8s cubic-bezier(.2,.65,.2,1.1);
}

.card.selected .card-inner{
  transform: rotateY(180deg);
}

.card-face{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 14px;
  overflow: hidden;
  backface-visibility: hidden;
  box-shadow: 0 10px 18px rgba(0,0,0,.35);
}

.card-back{
  background: #1a2030;
  border: 1px solid var(--glass-brd);
  transform: rotateY(0deg);
}
.card-front{
  transform: rotateY(180deg);
  border: 1px solid rgba(212,179,106,.4);
}

/* สถานะ */
.status{
  margin: 8px 0 22px;
  text-align: center;
  color: var(--muted);
  font-size: 0.98rem;
}

/* วิดีโอ */
.video-section{
  margin-top: 20px;
  padding: clamp(14px, 2.4vw, 22px);
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid var(--glass-brd);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.video-section h2{
  margin-top: 0;
  font-weight: 700;
}

.video-wrapper{
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--glass-brd);
  margin-bottom: 16px;
}

.video-wrapper iframe{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* ปุ่ม */
.actions{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn{
  appearance: none;
  border: 1px solid var(--accent);
  background: linear-gradient(180deg, rgba(212,179,106,.22), rgba(212,179,106,.08));
  color: #1a1510;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform .1s ease, filter .2s ease;
}
.btn:hover{ filter: brightness(1.08); }
.btn:active{ transform: translateY(1px); }

.btn-outline{
  background: transparent;
  color: var(--text);
  border-color: var(--glass-brd);
}

/* ท้ายหน้า */
.footer{
  text-align: center;
  margin-top: 24px;
  color: var(--muted);
  font-size: .9rem;
}

/* เอฟเฟกต์ชวนคลิกเล็กน้อย */
.card:not(.selected):hover{
  transform: translateY(-2px) scale(1.02);
}