:root {
  --bg: #f5f5f7;
  --text: #131316;
  --muted: #6d6f78;
  --panel: rgba(255, 255, 255, 0.76);
  --line: rgba(20, 20, 24, 0.08);
  --shadow-soft: 0 14px 35px rgba(17, 18, 26, 0.08);
  --shadow-strong: 0 22px 50px rgba(16, 17, 23, 0.18);
  --accent: #1d4ed8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(96, 165, 250, 0.15), transparent 35%),
    radial-gradient(circle at 100% 100%, rgba(16, 185, 129, 0.14), transparent 30%),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 36px 24px 48px;
}

.hero {
  text-align: center;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

h1 {
  margin: 12px 0 10px;
  font-size: clamp(30px, 3.2vw, 44px);
  font-weight: 700;
}

.sub {
  margin: 0;
  color: var(--muted);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-bottom: 26px;
}

button {
  border: none;
  border-radius: 999px;
  padding: 12px 26px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
}

button:active {
  transform: translateY(1px);
}

.draw-btn {
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.draw-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.ghost-btn {
  background: rgba(255, 255, 255, 0.7);
  color: var(--text);
  border: 1px solid var(--line);
}

.status {
  width: 100%;
  text-align: center;
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.stage {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

.spotlight {
  width: min(360px, 92vw);
  aspect-ratio: 3 / 4.4;
  border-radius: 24px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.spotlight-empty {
  color: var(--muted);
  font-size: 15px;
}

.deck {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px;
}

.card {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4.4;
  perspective: 900px;
}

.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.22, 0.9, 0.29, 1);
}

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

.face {
  position: absolute;
  inset: 0;
  border-radius: 18px;
  backface-visibility: hidden;
  overflow: hidden;
}

.back {
  background:
    linear-gradient(150deg, #0f172a, #1e3a8a 55%, #0ea5e9);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-soft);
}

.back::before {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.back::after {
  content: "CARD";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  letter-spacing: 0.25em;
  color: rgba(255, 255, 255, 0.72);
  font-weight: 600;
  font-size: 12px;
}

.front {
  transform: rotateY(180deg);
  background: linear-gradient(165deg, #ffffff, #eef3ff 80%);
  border: 1px solid rgba(25, 25, 35, 0.1);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 14px;
}

.front .num {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.front .title {
  margin: 0;
  font-size: 21px;
}

.front .line {
  margin: 0;
  color: #3c3f4b;
  font-size: 14px;
}

.spotlight-card {
  width: 82%;
  aspect-ratio: 3 / 4.4;
  animation: zoom-in 0.42s cubic-bezier(0.22, 0.9, 0.29, 1);
}

.spotlight-card .face {
  border-radius: 22px;
}

.spotlight-card .front {
  padding: 20px;
}

.spotlight-card .front .title {
  font-size: 30px;
}

.spotlight-card .front .line {
  font-size: 15px;
}

@keyframes zoom-in {
  0% {
    transform: scale(0.75) translateY(12px);
    opacity: 0;
  }
  100% {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

@media (max-width: 600px) {
  .app {
    padding: 24px 14px 34px;
  }

  .deck {
    grid-template-columns: repeat(auto-fit, minmax(95px, 1fr));
    gap: 10px;
  }

  .controls {
    gap: 10px;
  }
}