:root {
  --text: #eef5ff;
  --muted: #bfd0ea;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--text);
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: radial-gradient(circle at 14% 0%, #35547f 0%, #1c3858 44%, #0f2139 100%);
}

.app {
  width: min(100%, 540px);
  margin: 0 auto;
  padding: max(16px, env(safe-area-inset-top)) 14px max(16px, env(safe-area-inset-bottom));
}

.eyebrow {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

h1 {
  margin: 6px 0 8px;
  font-size: clamp(24px, 6vw, 33px);
}

.subtitle {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.35;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.card {
  min-height: 122px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: linear-gradient(160deg, #234368 0%, #1a3351 100%);
  color: #f1f7ff;
  font: inherit;
  font-weight: 800;
  font-size: 15px;
  padding: 8px;
  display: grid;
  place-items: center;
}

.card.face-up {
  background: linear-gradient(160deg, #ffe39f 0%, #ffb95f 100%);
  color: #13263f;
}

.card.picked {
  outline: 2px solid #97f1cb;
  outline-offset: 1px;
}

.actions {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 12px;
  font: inherit;
  font-weight: 700;
}

button:disabled {
  opacity: 0.55;
}

.ghost {
  background: rgba(255, 255, 255, 0.15);
  color: #eaf3ff;
  border: 1px solid rgba(255, 255, 255, 0.24);
}

.primary {
  background: linear-gradient(120deg, #63d2ff 0%, #2a9ef0 100%);
  color: #17304e;
}

.result,
.debug {
  margin-top: 12px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(11, 22, 37, 0.72);
  padding: 12px;
}

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

.debug pre {
  white-space: pre-wrap;
  font-size: 12px;
  color: #d4e9ff;
}

.debug button {
  width: 100%;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.hidden {
  display: none;
}