/* style.css */
body {
  font-family: 'Montserrat', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(135deg, #2b5876 0%, #4e4376 100%);
  overflow: hidden;
  animation: gradientBG 12s ease-in-out infinite alternate;
}
@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

#start-screen {
  position: absolute;
  top: 0; left: 0;
  width: 100vw; height: 100vh;
  background: rgba(245, 215, 110, 0.95);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  backdrop-filter: blur(2px);
}
#start-container {
  background: white;
  padding: 40px 60px;
  border-radius: 18px;
  box-shadow: 0 14px 48px 0 rgba(60,60,100,0.16);
  text-align: center;    /* center opening message */
  max-width: 80%;
  border: 3px solid #FFD700;
}
#start-screen p {
  font-size: 2rem;
  color: #2b5876;
  margin-bottom: 28px;
  font-weight: 700;
  letter-spacing: 0.01em;
}
#start-btn {
  padding: 16px 36px;
  font-size: 1.2rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(90deg, #ffb347 0%, #ffcc33 100%);
  color: #333;
  font-weight: 700;
  letter-spacing: 0.03em;
  box-shadow: 0 3px 12px rgba(0,0,0,0.09);
  transition: background 0.18s, transform 0.14s;
}
#start-btn:hover {
  background: linear-gradient(90deg, #ffcc33 0%, #ffb347 100%);
  transform: scale(1.06);
}

.bar {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
  border-radius: 18px;
  user-select: none;
  cursor: grab;
  touch-action: none;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  box-shadow: 0 4px 24px 0 rgba(40,40,80,0.16), 0 1.5px 0 #fff7;
  border: 3px solid #fff5;
  transition:
    left 0.25s cubic-bezier(.4,1.6,.47,1),
    top  0.25s cubic-bezier(.4,1.6,.47,1),
    box-shadow 0.18s,
    transform 0.18s;
  background-blend-mode: multiply, overlay;
  background-size: 100% 100%, 30px 30px, 12px 12px;
  background-repeat: no-repeat, repeat, repeat;
  z-index: 1; /* bars sit above dropzone (z:0) */
}
.bar[data-note="C"] {
  background-image:
    linear-gradient(135deg,#ff4040,#f04242),
    repeating-linear-gradient(45deg,#fff5 0 2px,transparent 2px 6px),
    repeating-linear-gradient(-45deg,#fff2 0 1px,transparent 1px 5px);
}
/* … same gradients for D, E, F, G, A, B … */
.bar:active {
  box-shadow: 0 6px 32px #2226, 0 1.5px 0 #fff7;
  transform: scale(1.07) rotate(-2deg);
  z-index: 10;
}

#dropzone {
  position: absolute;
  bottom: 50px;        /* just under Submit button */
  left: 0; right: 0;
  margin: auto;
  height: 210px;
  max-width: 670px;
  background: linear-gradient(108deg, #ffffffbb 60%, #f8e9e9 100%);
  border: 4px solid #ffe066;
  border-radius: 18px;
  box-shadow: 0 8px 48px 0 rgba(120,120,180,0.13);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 0;          /* behind bars */
  transition: box-shadow 0.22s;
  overflow: visible;
}
#dropzone:after {
  content: "Arrange bars here";
  position: absolute;
  top: 14px; left: 0; right: 0;
  font-size: 1.1rem;
  color: #be9b18;
  text-align: center;
  opacity: 0.82;
  letter-spacing: 0.08em;
  font-weight: 700;
  pointer-events: none;
}

.refresh-btn {
  position: absolute;
  top: 20px; right: 24px;
  background: linear-gradient(90deg,#ffb347,#ffcc33);
  border: 2px solid #ffe066;
  border-radius: 8px;
  cursor: pointer;
  padding: 8px 10px;
  z-index: 1000;
  box-shadow: 0 2px 8px #c3b98799;
  transition: background 0.14s, transform 0.12s;
}
.refresh-btn:hover {
  background: linear-gradient(90deg,#ffcc33,#ffb347);
  transform: scale(1.09);
}

/* restore refresh icon */
.refresh-icon {
  width: 26px;
  height: 26px;
  fill: #be9b18;
}

#submit-btn {
  position: absolute;
  left: 50%; bottom: 260px;
  transform: translateX(-50%);
  padding: 12px 32px;
  font-size: 1.12rem;
  border: 2.5px solid #ffd700;
  border-radius: 9px;
  background: linear-gradient(90deg,#ffe066,#fffbcc);
  color: #3f3f3f;
  font-weight: 700;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 2px 20px #ffd70033;
  letter-spacing: 0.03em;
  transition: box-shadow 0.15s, filter 0.18s, outline 0.15s;
  outline: none;
}
#submit-btn:hover,
#submit-btn:focus {
  box-shadow: 0 0 0 0 #ffd70066, 0 0 8px 2px #ffd700bb, 0 2px 24px #ffedb733;
  filter: brightness(1.07) drop-shadow(0 0 10px #fff5);
  outline: 2.5px solid #ffd700aa;
  background: linear-gradient(90deg,#fffbe5 0%,#ffe066 70%,#fffbcc 100%);
}

#timer {
  position: absolute;
  left: 50%; bottom: 16px;
  transform: translateX(-50%);
  font-size: 1.7rem;
  font-weight: 700;
  color: #ffe066;
  text-shadow: 0 2px 8px #2227;
  padding: 7px 24px;
  background: rgba(40,42,80,0.35);
  border-radius: 10px;
  z-index: 5;          /* above bars */
  pointer-events: none;
  border: 2.5px solid #ffd700;
  box-shadow: 0 4px 24px #ffd70044;
}

#message-box {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  padding: 28px 42px;
  border-radius: 18px;
  font-size: 1.28rem;
  color: white;
  z-index: 2001;
  display: none;
  font-weight: 700;
  text-shadow: 0 2px 4px #0003;
  box-shadow: 0 4px 32px #1d2b6466;
  border: 3.5px solid #fff7;
  letter-spacing: 0.04em;
  text-align: center;   /* center success/error text */
}
.success { background: linear-gradient(90deg,#43e97b,#38f9d7); border-color: #d2ffec; color: #063a2f; }
.error   { background: linear-gradient(90deg,#ff512f,#f09819); border-color: #ffd6c1; color: #42250c; animation: shake 0.6s; }
@keyframes shake {
  0%   { transform: translate(-50%,-50%) translateX(0); }
  20%  { transform: translate(-50%,-50%) translateX(-11px); }
  40%  { transform: translate(-50%,-50%) translateX(11px); }
  60%  { transform: translate(-50%,-50%) translateX(-8px); }
  80%  { transform: translate(-50%,-50%) translateX(8px); }
  100% { transform: translate(-50%,-50%) translateX(0); }
}

@media (max-width: 800px) {
  #dropzone { max-width: 98vw; min-width: 0; }
  .bar { font-size: 1.3rem; }
}
@media (max-width: 550px) {
  #dropzone { height: 170px; }
  .bar { font-size: 1.06rem; }
  #message-box { padding: 15px; font-size: 1rem; }
  #start-container { padding: 16px 3vw; }
} /* Mode button group for centering and spacing */
.mode-btn-group {
  display: flex;
  gap: 18px;
  justify-content: center;
  margin-top: 18px;
}

/* Mode Buttons - styled like #start-btn and #submit-btn */
.mode-btn {
  padding: 16px 36px;
  font-size: 1.2rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: linear-gradient(90deg, #ffb347 0%, #ffcc33 100%);
  color: #333;
  font-weight: 700;
  letter-spacing: 0.03em;
  box-shadow: 0 3px 12px rgba(0,0,0,0.09);
  transition: background 0.18s, transform 0.14s;
}

.mode-btn:hover,
.mode-btn:focus {
  background: linear-gradient(90deg, #ffcc33 0%, #ffb347 100%);
  transform: scale(1.06);
  outline: 2.5px solid #ffd700aa;
}