:root {
  color-scheme: light dark;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --bg: #0f111a;
  --card: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.15);
  --text: #f3f4ff;
  --muted: #a5acc5;
  --accent: #a37bfa;
  --accent-strong: #d6b2ff;
  --warning: #ffce7a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #2a1e45, #0b0c17 60%);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 48px 16px 64px;
}

.app-shell {
  width: min(960px, 100%);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.hero {
  padding: 32px;
  border: 1px solid var(--card-border);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(33, 26, 57, 0.9), rgba(8, 10, 24, 0.95));
  box-shadow: 0 10px 40px rgba(8, 10, 24, 0.55);
}

.hero h1 {
  margin: 8px 0;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

.hero p {
  color: var(--muted);
  line-height: 1.6;
}

.eyebrow {
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--accent-strong);
}

.panel {
  padding: 24px;
  border: 1px solid var(--card-border);
  border-radius: 20px;
  background: var(--card);
  backdrop-filter: blur(16px);
}

.panel__header h2 {
  margin: 0;
  font-size: 1.15rem;
}

.panel__header p {
  margin: 4px 0 0;
  color: var(--muted);
}

textarea {
  margin-top: 16px;
  width: 100%;
  border-radius: 16px;
  padding: 16px;
  border: 1px solid transparent;
  background: rgba(10, 10, 18, 0.65);
  color: var(--text);
  font-size: 1rem;
  resize: vertical;
  transition: border 0.2s, box-shadow 0.2s;
}

textarea:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(163, 123, 250, 0.35);
}

.spread-row {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.muted {
  color: var(--muted);
  margin: 0 0 4px;
}

.auto-spread {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-strong);
}

.select-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.95rem;
}

select {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: rgba(8, 8, 14, 0.8);
  color: var(--text);
}

button.primary {
  margin-top: 12px;
  padding: 14px 24px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #0b0c17;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button.primary:active {
  transform: scale(0.98);
}

.results {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hidden {
  display: none;
}

.shuffle {
  margin-top: 24px;
  padding: 20px;
  border: 1px dashed var(--card-border);
  border-radius: 16px;
  background: rgba(6, 6, 16, 0.75);
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.shuffle-visual {
  width: min(320px, 100%);
  height: 180px;
  position: relative;
  perspective: 800px;
}

.shuffle-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 24px;
  background: radial-gradient(circle, rgba(163, 123, 250, 0.35), transparent 60%);
  filter: blur(6px);
  z-index: 0;
}

.card-stack {
  position: absolute;
  width: 140px;
  height: 180px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.2), rgba(58, 32, 122, 0.3));
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  transform-origin: center;
  animation: shuffleSlide 2.4s ease-in-out infinite;
  z-index: 1;
}

.card-stack--one {
  left: 0;
  animation-delay: 0s;
}

.card-stack--two {
  left: 90px;
  animation-delay: 0.3s;
}

.card-stack--three {
  left: 180px;
  animation-delay: 0.6s;
}

@keyframes shuffleSlide {
  0% {
    transform: rotateY(-6deg) translateY(0);
  }
  40% {
    transform: rotateY(12deg) translateY(-10px);
  }
  80% {
    transform: rotateY(-4deg) translateY(6px);
  }
  100% {
    transform: rotateY(-6deg) translateY(0);
  }
}

.shuffle-status {
  margin: 0;
  color: var(--accent-strong);
  font-weight: 600;
  text-align: center;
}

.card-grid {
  width: 100%;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 16px;
  opacity: 0;
  transform: translateY(12px) scale(0.98);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.card-grid--visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.card-back {
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 18px;
  padding: 26px 16px;
  background: linear-gradient(135deg, rgba(34, 18, 72, 0.95), rgba(6, 6, 16, 0.95));
  color: var(--text);
  text-align: center;
  font-weight: 600;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
  animation: cardFloat 4s ease-in-out infinite;
}

.card-back::before {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 12px;
  border: 1px dashed rgba(255, 255, 255, 0.12);
  pointer-events: none;
}

.card-back__front {
  position: relative;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.9rem;
}

.card-back__glow {
  position: absolute;
  width: 120%;
  height: 50%;
  background: radial-gradient(circle, rgba(163, 123, 250, 0.45), transparent 70%);
  top: -10%;
  left: -10%;
  filter: blur(12px);
  opacity: 0;
  transition: opacity 0.35s;
}

.card-back:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 16px 35px rgba(0, 0, 0, 0.5);
  border-color: rgba(255, 255, 255, 0.45);
}

.card-back:hover .card-back__glow {
  opacity: 1;
}

.card-back.revealed {
  background: linear-gradient(135deg, rgba(8, 8, 18, 0.95), rgba(30, 18, 54, 0.9));
  border-color: var(--accent);
  animation: none;
}

.card-back__title {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
}

.card-back small {
  display: block;
  font-size: 0.82rem;
  color: var(--muted);
}

@keyframes cardFloat {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
  100% {
    transform: translateY(0);
  }
}

.cards {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 16px;
  background: rgba(7, 7, 16, 0.9);
  position: relative;
}

.card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.card span {
  display: inline-block;
  margin-top: 4px;
  font-size: 0.9rem;
  color: var(--muted);
}

.card p {
  margin: 8px 0 0;
  color: var(--text);
  line-height: 1.5;
}

.position-label {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--warning);
  text-transform: uppercase;
}

.reading {
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 20px;
  background: rgba(5, 5, 12, 0.85);
  line-height: 1.7;
  color: var(--text);
}

.ai-note {
  margin-top: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255, 206, 122, 0.4);
  background: rgba(255, 206, 122, 0.08);
  color: var(--warning);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  body {
    padding: 24px 12px 48px;
  }

  .panel,
  .hero {
    padding: 20px;
  }

  .spread-row {
    flex-direction: column;
    align-items: flex-start;
  }

  select {
    width: 100%;
  }
}