:root {
  --font-heading: "Orbitron", "Segoe UI", sans-serif;
  --font-body: "Exo 2", "Segoe UI", sans-serif;

  --bg-a: #0a1027;
  --bg-b: #1a1e43;
  --bg-c: #05374d;
  --panel: rgba(10, 16, 40, 0.5);
  --panel-border: rgba(255, 255, 255, 0.2);
  --text: #ecf2ff;
  --muted: #a8b6db;
  --accent: #5cf3ff;
  --accent-2: #8dfc8d;
  --danger: #ff6a8b;
  --warning: #ffd369;
  --card-back: linear-gradient(160deg, #171e53, #09273a);
  --card-front: linear-gradient(150deg, #113f5f, #23827c);
  --glow: 0 0 24px rgba(92, 243, 255, 0.38);
  --shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

body.light-mode {
  --bg-a: #d7ebff;
  --bg-b: #f8fbff;
  --bg-c: #c4eaf6;
  --panel: rgba(255, 255, 255, 0.55);
  --panel-border: rgba(31, 53, 94, 0.18);
  --text: #1a2a4b;
  --muted: #48618e;
  --accent: #1456ff;
  --accent-2: #009378;
  --danger: #d64262;
  --warning: #b37b00;
  --card-back: linear-gradient(160deg, #c8d9ff, #a3d2f3);
  --card-front: linear-gradient(150deg, #9ecfff, #77f0d0);
  --glow: 0 0 24px rgba(20, 86, 255, 0.22);
  --shadow: 0 16px 34px rgba(18, 45, 78, 0.18);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--text);
  background: radial-gradient(circle at 10% 20%, var(--bg-c), transparent 40%),
              radial-gradient(circle at 80% 10%, var(--bg-b), transparent 55%),
              linear-gradient(130deg, var(--bg-a), #040610 72%);
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

body.gameplay-active {
  overflow: hidden;
}

body.gameplay-active .app-shell {
  position: fixed;
  inset: 0;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 0.55rem;
  min-height: 100vh;
}

body.gameplay-active #gameScreen.active {
  height: 100%;
}

.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
}

#particleCanvas,
#confettiCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#confettiCanvas {
  z-index: 40;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(18px);
  opacity: 0.7;
  animation: drift 9s ease-in-out infinite alternate;
}

.orb-a {
  width: 36vw;
  height: 36vw;
  max-width: 520px;
  max-height: 520px;
  left: -10vw;
  top: -7vw;
  background: radial-gradient(circle at 30% 30%, rgba(88, 221, 255, 0.58), rgba(88, 221, 255, 0));
}

.orb-b {
  width: 34vw;
  height: 34vw;
  max-width: 480px;
  max-height: 480px;
  right: -8vw;
  top: 12vh;
  background: radial-gradient(circle at 40% 40%, rgba(128, 255, 152, 0.5), rgba(128, 255, 152, 0));
  animation-delay: 1.6s;
}

.orb-c {
  width: 28vw;
  height: 28vw;
  max-width: 380px;
  max-height: 380px;
  left: 35vw;
  bottom: -10vw;
  background: radial-gradient(circle at 40% 40%, rgba(157, 120, 255, 0.45), rgba(157, 120, 255, 0));
  animation-delay: 0.9s;
}

.loading-screen {
  position: fixed;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 0.6rem;
  text-align: center;
  background: linear-gradient(130deg, #050913, #11173f 60%, #003f4f);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease;
}

.loading-screen.active {
  opacity: 1;
  visibility: visible;
}

.loading-screen h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  margin: 0;
  letter-spacing: 0.22em;
}

.loading-screen p {
  margin: 0;
  color: #c8d2f5;
  font-size: 0.96rem;
}

.loading-core {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  margin: 0 auto 0.4rem;
  border: 3px solid rgba(255, 255, 255, 0.14);
  border-top-color: #8deeff;
  animation: spin 1s linear infinite;
}

.loading-bar-wrap {
  width: min(280px, 80vw);
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.12);
}

.loading-bar {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, #5cf3ff, #8dfc8d);
  transition: width 0.3s ease;
}

.app-shell {
  width: min(1280px, 95vw);
  margin: 1rem auto;
  padding-top: 52px;
  min-height: calc(100vh - 2rem);
  position: relative;
  z-index: 5;
}

.screen {
  display: none;
  animation: fadeIn 0.5s ease;
}

.screen.active {
  display: block;
}

#gameScreen.active {
  height: calc(100vh - 2rem);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 0.6rem;
}

.glass-panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  border-radius: 22px;
}

.hero {
  padding: clamp(1rem, 2.4vw, 2rem);
}

.logo-wrap {
  text-align: center;
  margin-bottom: 1.2rem;
}

.game-title {
  margin: 0;
  font-family: var(--font-heading);
  letter-spacing: 0.16em;
  font-size: clamp(1.8rem, 5.2vw, 4rem);
  text-shadow: 0 0 14px rgba(126, 244, 255, 0.6);
}

.subtitle {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: clamp(0.92rem, 1.5vw, 1.1rem);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 0.8rem;
}

.control-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.9rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
}

.control-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

select {
  appearance: none;
  border: 1px solid var(--panel-border);
  background: rgba(2, 7, 18, 0.7);
  color: var(--text);
  border-radius: 12px;
  padding: 0.72rem;
  font-family: var(--font-body);
  font-weight: 600;
}

body.light-mode select {
  background: rgba(255, 255, 255, 0.86);
}

button {
  border: none;
  font-family: var(--font-body);
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.2s ease, filter 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: translateY(-2px) scale(1.01);
}

button:active {
  transform: translateY(0) scale(0.99);
}

.pill-btn,
.outline-btn {
  border-radius: 999px;
  padding: 0.74rem 1rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--panel-border);
}

.cta-btn {
  border-radius: 999px;
  padding: 0.84rem 1.35rem;
  color: #03101f;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(130deg, #5cf3ff, #8dfc8d);
  box-shadow: var(--glow);
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 0.7rem;
  margin: 0.95rem 0;
}

.stat-card {
  padding: 0.9rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 14px;
}

.stat-card span {
  display: block;
  font-size: 0.84rem;
  color: var(--muted);
}

.stat-card strong {
  font-size: 1.2rem;
  font-family: var(--font-heading);
  letter-spacing: 0.05em;
}

.actions-row {
  display: flex;
  gap: 0.8rem;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.actions-row.center {
  justify-content: center;
}

.hud {
  display: grid;
  grid-template-columns: repeat(5, minmax(90px, 1fr));
  gap: 0.5rem;
  padding: 0.75rem;
  margin-bottom: 0;
}

.hud-item {
  text-align: center;
  padding: 0.65rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
}

.hud-item span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.hud-item strong {
  font-size: 1.12rem;
  font-family: var(--font-heading);
  letter-spacing: 0.06em;
}

.hud-item.combo strong {
  color: var(--accent-2);
  text-shadow: 0 0 10px rgba(141, 252, 141, 0.55);
}

.board-wrapper {
  position: relative;
  width: 100%;
  min-height: 0;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 20px;
  padding: clamp(0.55rem, 1.2vw, 0.95rem);
  background: rgba(0, 0, 0, 0.14);
  border: 1px solid var(--panel-border);
}

.memorize-countdown {
  position: absolute;
  top: 0.9rem;
  left: 50%;
  transform: translateX(-50%) scale(0.92);
  z-index: 20;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(5, 14, 34, 0.74);
  font-family: var(--font-heading);
  font-size: clamp(0.85rem, 1.4vw, 1rem);
  letter-spacing: 0.08em;
  color: #e9f9ff;
  text-transform: uppercase;
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.28);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.memorize-countdown.show {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

.game-board {
  display: grid;
  width: min(100%, var(--board-size, 78vmin));
  height: min(100%, var(--board-size, 78vmin));
  gap: var(--card-gap, 12px);
  grid-template-columns: repeat(var(--grid-size, 4), minmax(0, 1fr));
  grid-template-rows: repeat(var(--grid-size, 4), minmax(0, 1fr));
}

.card {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 14px;
  perspective: 1000px;
  cursor: pointer;
}

.card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1);
  border-radius: inherit;
}

.card.is-flipped .card-inner,
.card.is-matched .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: inherit;
  backface-visibility: hidden;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.card-front {
  transform: rotateY(180deg);
  background: var(--card-front);
  font-size: clamp(1rem, 1.2vw + 0.9rem, 2rem);
  box-shadow: inset 0 1px 12px rgba(255, 255, 255, 0.2);
}

.card-back {
  background: var(--card-back);
  overflow: hidden;
}

.card-back::before {
  content: "";
  position: absolute;
  inset: 20%;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.24);
  animation: pulseRing 1.8s ease-in-out infinite;
}

.card:hover .card-inner {
  transform: translateY(-2px) scale(1.01);
}

.card.is-matched .card-front {
  box-shadow: 0 0 22px rgba(141, 252, 141, 0.75), inset 0 0 18px rgba(255, 255, 255, 0.22);
  animation: glowMatched 1.1s ease;
}

.card.is-mismatch .card-inner {
  animation: shake 0.38s ease;
}

.game-actions {
  display: flex;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 0;
  flex-wrap: wrap;
}

.overlay {
  position: fixed;
  inset: 0;
  z-index: 55;
  display: grid;
  place-items: center;
  visibility: hidden;
  opacity: 0;
  background: rgba(2, 6, 14, 0.64);
  backdrop-filter: blur(10px);
  transition: opacity 0.28s ease, visibility 0.28s ease;
}

.overlay.show {
  visibility: visible;
  opacity: 1;
}

.overlay-card {
  width: min(680px, 92vw);
  padding: clamp(1rem, 3vw, 1.6rem);
  text-align: center;
  transform: translateY(20px) scale(0.98);
  opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
}

.overlay.show .overlay-card {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.overlay-card h2 {
  margin: 0;
  font-family: var(--font-heading);
  letter-spacing: 0.08em;
}

.overlay-card p {
  color: var(--muted);
}

.win-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(110px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.win-grid > div {
  background: rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 0.75rem;
}

.win-grid span {
  display: block;
  color: var(--muted);
}

.win-grid strong {
  font-family: var(--font-heading);
  font-size: 1.12rem;
}

.combo-popup {
  position: fixed;
  top: 22%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.75);
  opacity: 0;
  z-index: 35;
  pointer-events: none;
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 2vw, 2rem);
  color: var(--accent-2);
  text-shadow: 0 0 16px rgba(141, 252, 141, 0.85);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.combo-popup.show {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

.achievement-rack {
  position: fixed;
  right: 1.3rem;
  top: 0.8rem;
  z-index: 35;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.achievement-pill {
  padding: 0.6rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(3, 9, 24, 0.78);
  color: #eaf7ff;
  font-size: 0.82rem;
  box-shadow: var(--shadow);
  animation: slideIn 0.35s ease;
}

.leaderboard-card {
  max-width: 520px;
}

.leaderboard-list {
  margin: 1rem 0 1.1rem;
  padding-left: 1.1rem;
  text-align: left;
  max-height: 45vh;
  overflow: auto;
}

.leaderboard-list li {
  margin-bottom: 0.55rem;
  padding: 0.55rem 0.62rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
}

.leaderboard-list li strong {
  font-family: var(--font-heading);
}

.theme-animals {
  --accent: #68f9c8;
  --accent-2: #ffe066;
  --card-front: linear-gradient(160deg, #2e8f66, #61d691);
  --card-back: linear-gradient(145deg, #15483b, #1e2f57);
}

.theme-space {
  --accent: #8ed2ff;
  --accent-2: #c9a4ff;
  --card-front: linear-gradient(160deg, #4f5eff, #a25dff);
  --card-back: linear-gradient(145deg, #1b224f, #020514);
}

.theme-fruits {
  --accent: #ffc15f;
  --accent-2: #7cf7a0;
  --card-front: linear-gradient(160deg, #ff8d59, #ffd15d);
  --card-back: linear-gradient(145deg, #682930, #2b445c);
}

.theme-emoji {
  --accent: #6dd9ff;
  --accent-2: #ffd86d;
  --card-front: linear-gradient(160deg, #5c8dff, #54c8f8);
  --card-back: linear-gradient(145deg, #143962, #351751);
}

.theme-fantasy {
  --accent: #c9a4ff;
  --accent-2: #6bf2ce;
  --card-front: linear-gradient(160deg, #6754ff, #8f60f4);
  --card-back: linear-gradient(145deg, #2a1c47, #153c56);
}

.theme-technology {
  --accent: #5cf3ff;
  --accent-2: #8dfc8d;
  --card-front: linear-gradient(160deg, #00a1d6, #00d299);
  --card-back: linear-gradient(145deg, #06273e, #0f3a3a);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(2vw, -2vh) scale(1.08); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes glowMatched {
  0% { transform: scale(0.95); }
  40% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

@keyframes pulseRing {
  0% { transform: scale(0.8); opacity: 0.65; }
  100% { transform: scale(1.2); opacity: 0; }
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

@keyframes slideIn {
  from { transform: translateX(22px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@media (max-width: 980px) {
  .hud {
    grid-template-columns: repeat(3, minmax(80px, 1fr));
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }

  .stats-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .app-shell {
    width: min(100vw, 100%);
    margin: 0;
    padding: 0.75rem;
    min-height: 100vh;
  }

  #gameScreen.active {
    height: calc(100vh - 1.5rem);
  }

  .hero {
    border-radius: 18px;
  }

  .game-board {
    gap: var(--card-gap-mobile, 8px);
  }

  .hud-item strong {
    font-size: 0.94rem;
  }

  .game-actions {
    justify-content: stretch;
  }

  .game-actions button {
    flex: 1;
    min-width: 110px;
  }

  .achievement-rack {
    right: 0.75rem;
    top: auto;
    bottom: 0.8rem;
  }

  .memorize-countdown {
    top: 0.55rem;
    font-size: 0.8rem;
    padding: 0.38rem 0.68rem;
  }
}