:root {
  color-scheme: light;
  --bg: #f6f2e7;
  --bg-top: #faf7ef;
  --ink: #1c2f5a;
  --ink-soft: #2f6fcc;
  --paper: #ffffff;
  --surface-soft: #ffffff;
  --accent: #f2b84b;
  --ok: #1ea38b;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1726;
  --bg-top: #182338;
  --ink: #e6edf7;
  --ink-soft: #9fc4ff;
  --paper: #16243b;
  --surface-soft: #1b2a43;
  --accent: #e6bf57;
  --ok: #44d0b5;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", Arial, sans-serif;
  background:
    radial-gradient(circle at 18% 12%, rgba(47, 111, 204, 0.24), transparent 42%),
    radial-gradient(circle at 82% 10%, rgba(242, 184, 75, 0.22), transparent 40%),
    radial-gradient(circle at top, var(--bg-top) 0%, var(--bg) 72%);
  color: var(--ink);
  padding: 20px 14px 28px;
}

.page {
  width: min(100%, 980px);
  margin: 0 auto;
}

.top {
  text-align: center;
  margin-bottom: 12px;
}

.top h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 2.7vw, 2.4rem);
}

.top p {
  margin: 4px 0;
  color: var(--ink-soft);
}

.hint {
  font-size: 0.95rem;
}

.controls,
.status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  background: var(--paper);
  border: 1px solid rgba(47, 111, 204, 0.2);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 12px;
  margin-bottom: 12px;
}

.mode-select {
  display: inline-flex;
  gap: 8px;
}

.mode-btn,
.new-game-btn {
  border: 1px solid rgba(47, 111, 204, 0.2);
  background: var(--surface-soft);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  font-weight: 700;
  cursor: pointer;
}

.mode-btn.active {
  background: var(--accent);
}

.new-game-btn {
  background: var(--ok);
  color: #fff;
  border-color: transparent;
}

.memory-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
}

.card {
  position: relative;
  min-height: 122px;
  border: none;
  border-radius: 12px;
  padding: 0;
  background: transparent;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.card.flipped {
  transform: translateY(-1px);
}

.card.matched {
  outline: 2px solid rgba(30, 163, 139, 0.55);
  border-radius: 12px;
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  box-shadow: var(--shadow);
  transition: opacity 0.25s ease;
}

.card-front {
  background: linear-gradient(135deg, #2f6fcc, #1c2f5a);
  color: #fff;
  font-size: 1.8rem;
  font-weight: 800;
  transform: rotateY(0deg);
  z-index: 2;
  opacity: 1;
}

.card-back {
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(47, 111, 204, 0.2);
  font-size: 0.92rem;
  line-height: 1.35;
  flex-direction: column;
  z-index: 1;
  opacity: 0;
}

.card.flipped .card-front,
.card.matched .card-front {
  opacity: 0;
}

.card.flipped .card-back,
.card.matched .card-back {
  opacity: 1;
}


.card-photo {
  display: block;
  font-size: 1.5rem;
  line-height: 1;
  margin-bottom: 6px;
}

.card-photo-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.card-text {
  display: block;
}

.card-back.word {
  font-weight: 700;
  font-size: 1rem;
}

.result {
  margin-top: 14px;
  background: var(--paper);
  border-radius: 14px;
  border: 1px solid rgba(47, 111, 204, 0.2);
  box-shadow: var(--shadow);
  padding: 16px;
}

.hidden {
  display: none;
}

@media (max-width: 900px) {
  .memory-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .memory-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .card {
    min-height: 112px;
  }
}