/* ---------- Theme ---------- */
:root {
  --bg: #f8e9c1;
  --card-back: #e0b24c;
  --card-front: #7798ab;
  --card-match: #d94f30;
  --text: #2d1b12;

  --radius: 10px;
  --border: 3px;
  --shadow: 2px 2px 0 var(--text);
}

/* ---------- Reset ---------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
img,
svg,
canvas,
video {
  display: block;
  max-width: 100%;
}
button,
input,
select,
textarea {
  font: inherit;
}
html,
body {
  height: 100%;
}

/* ---------- Base Layout ---------- */
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Limelight", system-ui, -apple-system, Segoe UI, Roboto, Arial,
    sans-serif;
  line-height: 1.5;

  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100svh;
  overflow: hidden;
  padding: 0 10px;
}

/* film grain & vinyet */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: url("assets/grain.jpg");
  background-size: 128px 128px;
  mix-blend-mode: multiply;
  opacity: 0.7;
  z-index: 0;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    circle,
    transparent 70%,
    rgba(0, 0, 0, 0.18) 100%
  );
  z-index: 0;
}

/* ---------- Sections ---------- */
.site-header,
.site-footer {
  text-align: center;
}
.site-header h1 {
  font-size: clamp(20px, 3.5vw, 36px);
  font-weight: 600;
}
.subtitle {
  font-size: clamp(14px, 2vw, 18px);
  color: var(--text);
  opacity: 0.85;
}

.site-footer {
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  padding-block: 8px;
}
.site-footer a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s;
}
.site-footer a:hover {
  color: var(--card-match);
}

.main {
  display: grid;
  grid-template-rows: 1fr auto auto; /* grid | score | actions */
  align-items: center;
  justify-items: center;
  gap: 12px;
  padding-block: 6px;
}

/* ---------- Grid ---------- */
.grid-container {
  display: grid;
  gap: 16px;
  max-width: 860px;
  width: 100%;
  grid-template-columns: repeat(6, 1fr);
  justify-items: center;
  align-content: center;
}
@media (max-width: 1200px) {
  .grid-container {
    grid-template-columns: repeat(5, 1fr);
  }
}
@media (max-width: 960px) {
  .grid-container {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 680px) {
  .grid-container {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- Card ---------- */
.card {
  aspect-ratio: 2 / 3;
  width: clamp(64px, 7.5vw, 96px);
  cursor: pointer;
  position: relative;

  border: none;
  box-shadow: none;

  border-radius: var(--radius);
  perspective: 800px;
  background: none;
}
.card:focus {
  outline: none;
}

.card:hover {
  transform: translate(-2px, -2px);
}
.card:active {
  transform: translate(2px, 2px);
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1.4);
  border-radius: inherit;
}
.card.flipped .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  backface-visibility: hidden;
  overflow: hidden;

  border: var(--border) solid var(--text);
  box-shadow: var(--shadow);
}

.card-back {
  background-color: var(--card-back);
  background-image: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.06),
    rgba(0, 0, 0, 0.06)
  );
}
.card-back::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(
      circle,
      rgba(45, 27, 18, 0.45) 1px,
      transparent 1.4px
    )
    0 0/10px 10px;
  mix-blend-mode: multiply;
  opacity: 0.22;
}

.card-front {
  transform: rotateY(180deg);
  background-color: var(--card-front);
  background-image: var(--img);
  background-repeat: no-repeat;
  background-position: center 86%;
  background-size: 82% auto;
  box-shadow: var(--shadow), inset 0 0 0 1px rgba(0, 0, 0, 0.15);
}

.card.matched .card-inner {
  transform: rotateY(180deg) scale(1.02);
}
.card.matched {
  pointer-events: none;
}

.card:focus-visible,
#restart:focus-visible {
  outline: 3px solid var(--card-match);
  outline-offset: 2px;
}

/* ---------- Score & Actions ---------- */
.score {
  font-size: clamp(14px, 1.8vw, 20px);
}
.actions {
  display: flex;
  justify-content: center;
}

/* ---------- Button ---------- */
#restart {
  font-size: clamp(14px, 1.5vw, 18px);
  padding: 0.5rem 1.2rem;
  color: var(--text);
  background-color: var(--card-back);
  border: var(--border) solid var(--text);
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 3px 3px 0 var(--text);
  transition: transform 0.15s, box-shadow 0.15s, background-color 0.2s,
    color 0.2s;
}
#restart:hover {
  background-color: var(--card-match);
  color: #fff;
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 var(--text);
}
#restart:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--text);
}

/* ---------- Motion preference ---------- */
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}