@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@700;900&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: radial-gradient(ellipse at 50% -10%, #1e1060 0%, #0a0a1a 55%);
  width: 100vw;
  height: 100vh;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Orbitron', 'Arial Black', Arial, sans-serif;
  color: #fff;
  user-select: none;
  -webkit-user-select: none;
  overflow: hidden;
}

/* -- Ambient glow blobs */
.blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
  animation: blobDrift ease-in-out infinite alternate;
}
@keyframes blobDrift {
  0%   { transform: translate(0px, 0px) scale(1.0); }
  100% { transform: translate(28px, 18px) scale(1.12); }
}

/* -- Floating gem particles */
.fgem {
  position: fixed;
  clip-path: polygon(50% 0%, 100% 40%, 50% 100%, 0% 40%);
  pointer-events: none;
  z-index: 0;
  animation: gemFloat linear infinite;
}
@keyframes gemFloat {
  0%   { transform: translateY(105vh) rotate(0deg);   opacity: 0;   }
  8%   { opacity: 0.45; }
  92%  { opacity: 0.35; }
  100% { transform: translateY(-8vh)  rotate(380deg); opacity: 0;   }
}

/* -- Center column */
#center-col {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  transform-origin: center center;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* -- Title */
#title {
  font-size: 22px;
  letter-spacing: 5px;
  margin-bottom: 10px;
  background: linear-gradient(90deg, #ffd93d, #ff6b6b, #a29bfe, #00cec9, #ffd93d);
  background-size: 300% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: titleShimmer 4s linear infinite;
  filter: drop-shadow(0 0 10px rgba(162,155,254,0.5));
}
@keyframes titleShimmer { to { background-position: 300% center; } }

/* -- HUD */
#hud {
  display: flex;
  gap: 12px;
  margin-bottom: 8px;
  width: 400px;
  max-width: 95vw;
}
.hud-card {
  flex: 1;
  background: linear-gradient(135deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.13);
  border-radius: 12px;
  padding: 8px 0;
  text-align: center;
  backdrop-filter: blur(6px);
}
.hud-label { font-size: 9px; letter-spacing: 3px; opacity: 0.45; }
.hud-value {
  font-size: 22px;
  background: linear-gradient(135deg, #ffd93d, #ffb347);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hud-card.hud-next {
  flex: 0 0 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 0 8px;
}
#next-canvas { display: block; }

#mute-btn {
  flex: 0 0 38px;
  align-self: center;
  width: 38px; height: 38px;
  background: linear-gradient(135deg, rgba(162,155,254,0.18), rgba(108,92,231,0.10));
  border: 1.5px solid rgba(162,155,254,0.38);
  border-radius: 50%;
  color: #d0c9ff;
  font-size: 17px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 8px rgba(108,92,231,0.25);
}
#mute-btn:hover {
  background: linear-gradient(135deg, rgba(162,155,254,0.35), rgba(108,92,231,0.25));
  border-color: #a29bfe;
  box-shadow: 0 0 14px rgba(162,155,254,0.55);
}
#mute-btn.muted {
  color: #636e72;
  background: rgba(30,30,50,0.4);
  border-color: rgba(99,110,114,0.3);
  box-shadow: none;
}

/* -- Game + side panels layout */
#game-area {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

/* -- Side panels */
.side-panel {
  width: 120px;
  background: linear-gradient(160deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 16px;
  padding: 14px 10px 16px;
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.panel-title {
  font-size: 8px;
  letter-spacing: 3px;
  opacity: 0.38;
  text-align: center;
  margin-bottom: 2px;
}
.gem-entry {
  display: flex;
  align-items: center;
  gap: 7px;
}
.gem-dot {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  flex-shrink: 0;
}
.gem-info { line-height: 1.3; }
.gem-lv  { font-size: 10px; font-weight: bold; }
.gem-pts { font-size: 8px; opacity: 0.45; font-family: Arial, sans-serif; }

/* how-to section inside right panel */
.how-to {
  margin-top: 6px;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.how-row {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  font-size: 9px;
  font-family: Arial, sans-serif;
  opacity: 0.55;
  line-height: 1.4;
}
.how-icon { font-size: 12px; flex-shrink: 0; }

/* decorative top gem on panels */
.panel-gem-deco {
  width: 28px;
  height: 28px;
  margin: 0 auto 4px;
  clip-path: polygon(50% 0%, 100% 38%, 50% 100%, 0% 38%);
  animation: decoSpin 6s linear infinite;
}
@keyframes decoSpin {
  0%   { transform: rotate(0deg)   scale(1);    filter: brightness(1.0); }
  50%  { transform: rotate(180deg) scale(1.15); filter: brightness(1.4); }
  100% { transform: rotate(360deg) scale(1);    filter: brightness(1.0); }
}

/* -- Canvas container */
#game-container {
  position: relative;
  flex-shrink: 0;
  border-radius: 12px;
  padding: 2px;
  background: linear-gradient(135deg, #6c5ce7, #fd79a8, #fdcb6e, #00cec9, #6c5ce7);
  background-size: 300% 300%;
  animation: borderAnim 5s ease infinite;
  box-shadow:
    0 0 25px rgba(108,92,231,0.45),
    0 0 65px rgba(108,92,231,0.18),
    inset 0 0 20px rgba(0,0,0,0.4);
}
@keyframes borderAnim {
  0%   { background-position:   0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position:   0% 50%; }
}
#game-container canvas {
  display: block;
  border-radius: 10px;
  cursor: crosshair;
  max-height: 80vh;
  width: auto !important;
}
#credit {
  position: absolute; bottom: 4px; right: 6px;
  font-family: Arial, sans-serif; font-size: 8px; letter-spacing: 0.5px;
  color: rgba(255,255,255,0.12);
  pointer-events: none; user-select: none; z-index: 5;
}

/* -- Game Over overlay */
#overlay {
  position: absolute;
  inset: 0;
  background: rgba(5,5,18,0.92);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  z-index: 20;
  backdrop-filter: blur(10px);
}
#overlay.hidden { display: none; }
#overlay h2 {
  font-size: 36px;
  letter-spacing: 3px;
  background: linear-gradient(135deg, #ff4757, #ff6b81);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 16px rgba(255,71,87,0.65));
  animation: goFlicker 1.2s ease-in-out infinite alternate;
}
@keyframes goFlicker {
  from { filter: drop-shadow(0 0 10px rgba(255,71,87,0.4)); }
  to   { filter: drop-shadow(0 0 24px rgba(255,71,87,0.9)); }
}
.go-score { font-size: 13px; color: rgba(255,255,255,0.5); font-family: Arial; }
.go-score span { font-size: 32px; color: #ffd93d; font-family: 'Orbitron', Arial Black; }
#restart-btn {
  background: linear-gradient(135deg, #6c5ce7, #a29bfe);
  border: none; color: #fff;
  font-family: 'Orbitron', Arial Black, Arial;
  font-size: 13px; letter-spacing: 2px;
  padding: 13px 32px; border-radius: 30px; cursor: pointer;
  box-shadow: 0 4px 20px rgba(108,92,231,0.55), 0 0 0 1px rgba(162,155,254,0.3);
  transition: transform .15s, box-shadow .15s; margin-top: 4px;
}
#restart-btn:hover  { transform: translateY(-2px); box-shadow: 0 6px 30px rgba(108,92,231,0.75), 0 0 0 1px rgba(162,155,254,0.5); }
#restart-btn:active { transform: translateY(1px); }

/* -- Hide side panels on narrow screens, show help btn */
#help-btn {
  display: none;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: -44px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(108,92,231,0.85), rgba(162,155,254,0.7));
  border: 1px solid rgba(162,155,254,0.5);
  color: #fff;
  font-family: 'Orbitron', Arial Black, Arial;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 0 14px rgba(108,92,231,0.6);
  z-index: 10;
  transition: transform .15s, box-shadow .15s;
}
#help-btn:hover { transform: translateY(-50%) scale(1.12); box-shadow: 0 0 22px rgba(162,155,254,0.9); }

@media (max-width: 700px) {
  .side-panel { display: none; }
  #game-area  { gap: 0; }
  #help-btn   { display: flex; align-items: center; justify-content: center; }
}

/* -- Help modal */
#help-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
}
#help-modal.open { display: flex; }
#help-modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(5,5,18,0.82);
  backdrop-filter: blur(6px);
}
#help-modal-box {
  position: relative;
  z-index: 101;
  background: linear-gradient(160deg, rgba(30,20,70,0.97), rgba(10,10,30,0.97));
  border: 1px solid rgba(162,155,254,0.25);
  border-radius: 18px;
  padding: 20px 18px 18px;
  max-width: 90vw;
  width: 340px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 0 50px rgba(108,92,231,0.5);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
#help-modal-box .panel-title { opacity: 0.7; margin-bottom: 0; }
#help-close {
  position: absolute; top: 12px; right: 14px;
  background: none; border: none; color: rgba(255,255,255,0.5);
  font-size: 20px; cursor: pointer; line-height: 1;
}
#help-close:hover { color: #fff; }
.help-section {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.help-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 18px;
}

/* -- Score pop animation */
@keyframes scorePop {
  0%   { transform: scale(1);    }
  45%  { transform: scale(1.40); filter: drop-shadow(0 0 12px #ffd93d); }
  100% { transform: scale(1);    }
}
.score-pop { animation: scorePop 0.45s cubic-bezier(0.36,0.07,0.19,0.97) both; }

/* -- Canvas edge flash on merge */
@keyframes edgeFlash {
  0%   { box-shadow: 0 0 25px rgba(108,92,231,0.45), 0 0 65px rgba(108,92,231,0.18), inset 0 0 20px rgba(0,0,0,0.4); }
  40%  { box-shadow: 0 0 55px var(--flash-color,#ffd93d), 0 0 110px var(--flash-color,#ffd93d), inset 0 0 30px rgba(0,0,0,0.3); }
  100% { box-shadow: 0 0 25px rgba(108,92,231,0.45), 0 0 65px rgba(108,92,231,0.18), inset 0 0 20px rgba(0,0,0,0.4); }
}
.edge-flash { animation: edgeFlash 0.55s ease-out both; }

/* -- Tier body backgrounds (smooth transition) */
body { transition: background 2.2s ease; }
body.tier-1 { background: radial-gradient(ellipse at 50% -10%, #251480 0%, #0a0a1e 55%); }
body.tier-2 { background: radial-gradient(ellipse at 50% -10%, #301272 0%, #0d0823 55%); }
body.tier-3 { background: radial-gradient(ellipse at 50% -10%, #3a0f58 0%, #120826 55%); }
body.tier-4 { background: radial-gradient(ellipse at 50% -10%, #3d1235 0%, #180818 55%); }
body.tier-5 { background: radial-gradient(ellipse at 50% -10%, #3d1800 0%, #1e0a00 55%); }

/* -- Tier-based floating gem speed */
body.tier-2 .fgem { animation-duration-multiplier: 0.8; }
body.tier-3 .fgem { filter: brightness(1.3); }
body.tier-4 .fgem { filter: brightness(1.6); }
body.tier-5 .fgem { filter: brightness(2.0) saturate(1.5); }

/* -- Tier border glow colors */
body.tier-3 #game-container { box-shadow: 0 0 30px rgba(255,99,72,0.55), 0 0 75px rgba(255,99,72,0.22), inset 0 0 20px rgba(0,0,0,0.4); }
body.tier-4 #game-container { box-shadow: 0 0 35px rgba(255,165,2,0.65),  0 0 85px rgba(255,165,2,0.28),  inset 0 0 20px rgba(0,0,0,0.4); }
body.tier-5 #game-container { box-shadow: 0 0 40px rgba(249,202,36,0.75), 0 0 100px rgba(249,202,36,0.35), inset 0 0 20px rgba(0,0,0,0.4); animation-duration: 2.5s; }