html,
body {
  margin: 0;
  height: 100%;
  background: #0f1115;
  color: #e5e9f0;
  font-family: system-ui, sans-serif;
}

#ui {
  position: fixed;
  inset: 12px auto auto 12px;
  background: #181a20;
  padding: 10px 12px;
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .35);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #2a2f3a;
  color: #e5e9f0;
  font-weight: 600;
}

a {
  color: #88c0d0;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

canvas {
  display: block;
  margin: 0 auto;
}

.pc-btn {
  border: none;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 700;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .25);
}

.pc-white {
  background: #eceff4;
  color: #2e3440;
}

.pc-black {
  background: #3b4252;
  color: #eceff4;
}

.pc-btn.active {
  outline: 3px solid #a3be8c;
}

.pc-btn.disabled {
  opacity: .45;
  cursor: not-allowed;
}

.pc-label {
  font-size: 13px;
  opacity: .8;
}

.pc-rem {
  font-weight: 600;
  opacity: .85;
}

/* Respect iOS/Android safe areas */
body {
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
           env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* Make the UI dock to top-left on desktop, bottom on phones */
@media (max-width: 640px) {
  #ui {
    inset: auto env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    left: 12px;
    right: 12px;
    bottom: 12px;
    top: auto;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
  }

  .pc-btn {
    padding: 8px 14px;
    font-size: 16px;
  }

  .pc-label { display: none; }          /* save space */
  .pc-rem { font-weight: 700; }

  /* Reduce box-shadow to save GPU on low-end phones */
  #ui { box-shadow: 0 4px 12px rgba(0,0,0,.25); }
}

/* Let the canvas capture gestures without double-tap zoom */
canvas {
  touch-action: manipulation; /* keeps pinch scroll on the page, removes dbl-tap zoom */
}

/* --- Help modal & backdrop --- */
.help-backdrop {
  position: fixed; inset: 0;
  background: rgba(15,17,21,0.55);
  backdrop-filter: blur(6px);
  opacity: 0; pointer-events: none;
  transition: opacity .22s ease;
  z-index: 900;
}

.help-dialog {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  pointer-events: none; z-index: 901;
  opacity: 0; transform: translateY(8px) scale(.98);
  transition: opacity .22s ease, transform .22s ease;
}

.help-dialog.open,
.help-backdrop.open {
  opacity: 1; pointer-events: auto;
}

.help-dialog.open {
  transform: translateY(0) scale(1);
}

/* Card */
.help-card {
  width: min(720px, calc(100% - 28px));
  background: rgba(36, 43, 57, 0.72);
  border: 1px solid rgba(136, 192, 208, 0.18);
  border-radius: 14px;
  box-shadow: 0 18px 60px rgba(0,0,0,.45);
  color: #e5e9f0;
  padding: 18px 18px 16px;
  transform-origin: 50% 44%;
  animation: pop .24s ease both;
}

@keyframes pop {
  0% { transform: scale(.96); opacity: .0; }
  100% { transform: scale(1); opacity: 1; }
}

.help-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 8px;
}
.help-icon {
  width: 34px; height: 34px; border-radius: 9px;
  display: grid; place-items: center;
  background: rgba(143,188,187,.18);
  color: #a3be8c; font-weight: 800;
}
.help-header h2 {
  margin: 0; font-size: 20px; letter-spacing: .2px;
}

.help-body { font-size: 15px; line-height: 1.5; }
.help-body ul { margin: 8px 0 0 18px; padding: 0; }
.help-body li { margin: 6px 0; }
.help-tip {
  margin-top: 12px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(163,190,140,.14);
  border: 1px dashed rgba(163,190,140,.35);
  font-weight: 600;
}

/* Close button */
.help-close {
  position: absolute; top: 10px; right: 10px;
  background: #2e3440; color: #eceff4;
  border: 1px solid rgba(216,222,233,.25);
  border-radius: 10px; padding: 4px 10px;
  cursor: pointer; font-weight: 700;
}
.help-close:hover { filter: brightness(1.08); }

/* Button subtle pulse to draw attention on first load (optional) */
@keyframes softPulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(136,192,208,.0); }
  50%     { box-shadow: 0 0 0 8px rgba(136,192,208,.12); }
}
#helpBtn.attn { animation: softPulse 2s ease-in-out 3; }

/* Mobile tweaks */
@media (max-width: 640px) {
  .help-card { padding: 16px 14px; }
  .help-header h2 { font-size: 18px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .help-backdrop, .help-dialog { transition: none; }
  .help-card { animation: none; }
  #helpBtn.attn { animation: none; }
}

/* keep existing .pc-btn; optionally tint when active */
.pc-btn.active { outline: 3px solid #a3be8c; }

/* Reuse help modal styling */
.settings-backdrop { composes: help-backdrop; }
.settings-dialog   { composes: help-dialog; }

/* If your build doesn't support 'composes', just duplicate selectors: */
.settings-backdrop {
  position: fixed; inset: 0;
  background: rgba(15,17,21,0.55);
  backdrop-filter: blur(6px);
  opacity: 0; pointer-events: none;
  transition: opacity .22s ease;
  z-index: 900;
}
.settings-dialog {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  pointer-events: none; z-index: 901;
  opacity: 0; transform: translateY(8px) scale(.98);
  transition: opacity .22s ease, transform .22s ease;
}
.settings-dialog.open,
.settings-backdrop.open {
  opacity: 1; pointer-events: auto;
}
.settings-dialog.open { transform: translateY(0) scale(1); }