* { box-sizing: border-box; }

:root {
  --bg-0: #04030d;
  --bg-1: #0a0820;
  --bg-2: #15103a;
  --panel: rgba(18, 14, 48, 0.55);
  --panel-solid: #14102e;
  --border: rgba(140, 120, 220, 0.25);
  --border-strong: rgba(170, 150, 240, 0.5);
  --text: #e7ecf3;
  --text-dim: #a7afc7;
  --text-mute: #7a82a0;
  --cyan: #7adfff;
  --magenta: #ff7adb;
  --gold: #ffd07a;
  --green: #71e08c;
  --red: #ff7a59;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}
/* In PWA standalone mode, lock the viewport so swipes don't trigger
   page scroll / pull-to-refresh / rubber-banding. */
html.pwa-standalone,
html.pwa-standalone body {
  overflow: hidden;
  overscroll-behavior: none;
  height: 100%;
  width: 100%;
}

html {
  /* Solid base color so safe-area / home-indicator regions never show
     through as white. Gradient layers added separately on top. */
  background-color: var(--bg-0);
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(120, 60, 220, 0.35), transparent 60%),
    radial-gradient(ellipse at 85% 90%, rgba(40, 120, 220, 0.30), transparent 55%),
    radial-gradient(ellipse at 50% 50%, rgba(20, 12, 60, 0.6), transparent 70%),
    linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 50%, var(--bg-0) 100%);
  background-attachment: fixed;
}

body {
  background:
    radial-gradient(ellipse at 20% 10%, rgba(120, 60, 220, 0.35), transparent 60%),
    radial-gradient(ellipse at 85% 90%, rgba(40, 120, 220, 0.30), transparent 55%),
    radial-gradient(ellipse at 50% 50%, rgba(20, 12, 60, 0.6), transparent 70%),
    linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 50%, var(--bg-0) 100%);
  background-attachment: fixed;
  position: relative;
  overflow-x: hidden;
}

/* Fixed-position background layer — covers the full viewport including
   iOS safe areas (home indicator region) where html/body backgrounds
   don't always reach in standalone PWA mode. */
body::after {
  content: "";
  position: fixed;
  top: -200px;
  right: -200px;
  bottom: -200px;
  left: -200px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 10%, rgba(120, 60, 220, 0.35), transparent 60%),
    radial-gradient(ellipse at 85% 90%, rgba(40, 120, 220, 0.30), transparent 55%),
    radial-gradient(ellipse at 50% 50%, rgba(20, 12, 60, 0.6), transparent 70%),
    linear-gradient(180deg, var(--bg-0) 0%, var(--bg-1) 50%, var(--bg-0) 100%);
}

/* Faint star sprinkle behind the page, made from layered radial gradients. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  background-image:
    radial-gradient(1px 1px at 12% 18%, rgba(255,255,255,0.7), transparent 60%),
    radial-gradient(1px 1px at 78% 32%, rgba(220,230,255,0.6), transparent 60%),
    radial-gradient(1.2px 1.2px at 45% 72%, rgba(255,220,200,0.55), transparent 60%),
    radial-gradient(1px 1px at 88% 84%, rgba(255,255,255,0.55), transparent 60%),
    radial-gradient(1px 1px at 22% 88%, rgba(200,210,255,0.55), transparent 60%),
    radial-gradient(1px 1px at 60% 12%, rgba(255,255,255,0.6), transparent 60%),
    radial-gradient(1px 1px at 8% 55%, rgba(220,230,255,0.55), transparent 60%),
    radial-gradient(1px 1px at 95% 48%, rgba(255,220,200,0.55), transparent 60%);
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  max-width: 760px;
  margin: 0 auto;
  padding-top:    max(45px, env(safe-area-inset-top));
  padding-right:  max(14px, env(safe-area-inset-right));
  padding-bottom: max(45px, env(safe-area-inset-bottom));
  padding-left:   max(14px, env(safe-area-inset-left));
  gap: 8px;
  position: relative;
  z-index: 1;
}

.topbar,
.controls,
.hint {
  width: 100%;
  max-width: var(--board-w, 100%);
  margin-left: auto;
  margin-right: auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.topbar h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 6px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 24px rgba(170, 130, 255, 0.35);
  filter: drop-shadow(0 0 10px rgba(122, 223, 255, 0.25));
}

.topRightCluster {
  display: flex;
  align-items: center;
  gap: 8px;
}
.iconBtns {
  display: flex;
  align-items: center;
  gap: 6px;
}
.modeTabs {
  display: flex;
  gap: 6px;
}
.iconBtn {
  width: 32px;
  height: 32px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(20, 16, 46, 0.55);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-dim);
  box-shadow: none;
}
.iconBtn:hover:not(:disabled) {
  background: rgba(40, 30, 80, 0.7);
  color: var(--text);
  border-color: var(--border-strong);
  box-shadow: none;
}
.iconBtn.active {
  background: linear-gradient(135deg, rgba(122,223,255,0.20), rgba(255,122,219,0.20));
  border-color: rgba(255, 122, 219, 0.7);
  color: var(--text);
}

.dirBtn.guideHint {
  border-color: var(--magenta);
  animation: guidePulse 1.1s ease-in-out infinite;
}
.dirBtn.guideMuted {
  opacity: 0.28;
  cursor: not-allowed;
}
@keyframes guidePulse {
  0%, 100% { box-shadow: 0 0 6px rgba(255, 122, 219, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.06); }
  50%      { box-shadow: 0 0 22px rgba(255, 122, 219, 0.85), inset 0 1px 0 rgba(255, 255, 255, 0.1); }
}
.modeTab {
  background: rgba(20, 16, 46, 0.6);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  transition: color 120ms, border-color 120ms, box-shadow 120ms, background 120ms;
}
.modeTab:hover {
  color: var(--text);
  border-color: var(--border-strong);
}
.modeTab.active {
  background: linear-gradient(135deg, rgba(122,223,255,0.18), rgba(255,122,219,0.18));
  color: #fff;
  border-color: rgba(122, 223, 255, 0.7);
  box-shadow: 0 0 14px rgba(122, 223, 255, 0.35), inset 0 0 8px rgba(255, 122, 219, 0.15);
}

.dateNav {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  opacity: 0.85;
}
.dateLabel {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--magenta);
  text-shadow: 0 0 10px rgba(255, 122, 219, 0.5);
  min-width: 130px;
  text-align: center;
}
.dateNavBtn {
  padding: 4px 10px;
  font-size: 9px;
  line-height: 1;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--magenta);
  border-radius: 6px;
  box-shadow: none;
  position: relative;
  top: 1px;
}
.dateNavBtn:hover:not(:disabled) {
  background: rgba(255, 122, 219, 0.12);
  border-color: rgba(255, 122, 219, 0.45);
  box-shadow: none;
}
.dateNavBtn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.overlayInner .leaderboardBlock h3 {
  position: relative;
  text-align: center;
  color: var(--magenta);
  text-shadow: 0 0 8px rgba(255, 122, 219, 0.35);
  margin: 4px 0 18px;
}
.lockedTag {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  padding: 1px 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  background: rgba(140, 120, 220, 0.18);
  color: var(--text-mute);
  border: 1px solid var(--border);
  border-radius: 999px;
  -webkit-background-clip: border-box;
  background-clip: border-box;
}

.ghostBtn {
  padding: 6px 12px;
  font-size: 13px;
  border-radius: 10px;
  background: rgba(20, 16, 46, 0.55);
  border: 1px solid var(--border);
  color: var(--text-dim);
}
.ghostBtn:hover:not(:disabled) {
  background: rgba(40, 30, 80, 0.7);
  color: var(--text);
  border-color: var(--border-strong);
}

.boardWrap {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}

canvas {
  display: block;
  background: transparent;
  border-radius: 14px;
  box-shadow:
    0 0 0 1px rgba(140, 120, 220, 0.22),
    0 8px 28px rgba(0, 0, 0, 0.55),
    0 0 40px rgba(120, 90, 220, 0.18);
  max-width: 100%;
  touch-action: none;
}

.overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--board-w, 100%);
  height: var(--board-h, 100%);
  transform: translate(-50%, -50%);
  background: rgba(4, 3, 13, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  padding: 14px;
}
.overlay.hidden,
.hidden { display: none !important; }

.overlayInner {
  background: linear-gradient(160deg, rgba(30, 22, 70, 0.95), rgba(14, 10, 36, 0.95));
  padding: 20px 24px;
  border-radius: 14px;
  text-align: center;
  min-width: 260px;
  max-width: 380px;
  width: 100%;
  border: 1px solid var(--border-strong);
  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.6),
    0 0 32px rgba(122, 223, 255, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
.overlayInner h2 {
  margin: 0 0 10px;
  font-size: 20px;
  letter-spacing: 2px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.overlayInner h3 {
  margin: 14px 0 6px;
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.overlayInner p { margin: 4px 0; color: var(--text-dim); }
.overlayInner p b { color: #fff; }

.submitBlock {
  margin-top: 10px;
  padding: 12px;
  background: rgba(8, 6, 24, 0.6);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.nameLabel {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  text-align: left;
  font-size: 12px;
  color: var(--text-mute);
  letter-spacing: 0.6px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.nameLabel input {
  margin-top: 4px;
  background: rgba(4, 3, 13, 0.7);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 14px;
  transition: border-color 120ms, box-shadow 120ms;
}
.nameLabel input:focus {
  border-color: var(--cyan);
  outline: none;
  box-shadow: 0 0 0 3px rgba(122, 223, 255, 0.18);
}

#btnSubmit { width: 100%; }

.submitMsg {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--text-mute);
  min-height: 1em;
}
.submitMsg.error   { color: var(--red); }
.submitMsg.success { color: var(--green); }

.leaderboardBlock {
  margin-top: 8px;
  text-align: left;
}
.lbList {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: lbItem;
}
.lbList li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 5px 0;
  border-bottom: 1px solid rgba(140, 120, 220, 0.18);
  counter-increment: lbItem;
}
.lbList li:last-child { border-bottom: none; }
.lbList li::before {
  content: counter(lbItem) ".";
  display: inline-block;
  width: 30px;
  padding-right: 6px;
  color: var(--text-mute);
  font-variant-numeric: tabular-nums;
}
.lbName {
  flex: 1;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 8px;
}
.lbMoves {
  color: var(--cyan);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 8px rgba(122, 223, 255, 0.4);
}
.lbStatus {
  font-size: 13px;
  color: var(--text-mute);
  font-style: italic;
  text-align: center;
}
.lbYou {
  margin-top: 8px !important;
  font-size: 13px;
  color: var(--text-dim);
}

.overlayButtons {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 14px;
}
.overlayButtonsStack {
  flex-direction: column;
  align-items: stretch;
}

.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.actionsCol {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
  min-width: 140px;
}
.movesRow {
  text-align: center;
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.4px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
}
.movesRow b {
  color: var(--cyan);
  font-weight: 700;
  text-shadow: 0 0 8px rgba(122, 223, 255, 0.45);
}
.actionsCol .ghostBtn {
  width: 100%;
}

.dpad {
  display: grid;
  grid-template-columns: repeat(3, 56px);
  grid-template-rows: repeat(2, 56px);
  gap: 6px;
}
.dpad .dirBtn[data-dir="up"]    { grid-column: 2; grid-row: 1; }
.dpad .dirBtn[data-dir="left"]  { grid-column: 1; grid-row: 2; }
.dpad .dirBtn[data-dir="down"]  { grid-column: 2; grid-row: 2; }
.dpad .dirBtn[data-dir="right"] { grid-column: 3; grid-row: 2; }

button {
  background: linear-gradient(180deg, rgba(40, 30, 80, 0.85), rgba(22, 16, 54, 0.85));
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.4px;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  transition: transform 80ms, box-shadow 120ms, background 120ms, border-color 120ms;
  box-shadow:
    0 2px 0 rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
button:hover:not(:disabled) {
  background: linear-gradient(180deg, rgba(60, 44, 120, 0.95), rgba(30, 22, 80, 0.95));
  border-color: rgba(122, 223, 255, 0.55);
  box-shadow:
    0 0 14px rgba(122, 223, 255, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
button:active:not(:disabled) {
  transform: translateY(1px);
  box-shadow:
    0 0 10px rgba(255, 122, 219, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
button:disabled { opacity: 0.5; cursor: not-allowed; }

#btnSubmit,
#btnRetry,
#btnNew,
#btnNewFromWin {
  background: linear-gradient(135deg, rgba(122, 223, 255, 0.25), rgba(255, 122, 219, 0.25));
  border-color: rgba(122, 223, 255, 0.6);
}
#btnSubmit:hover:not(:disabled),
#btnRetry:hover:not(:disabled),
#btnNew:hover:not(:disabled),
#btnNewFromWin:hover:not(:disabled) {
  background: linear-gradient(135deg, rgba(122, 223, 255, 0.4), rgba(255, 122, 219, 0.4));
  box-shadow:
    0 0 18px rgba(122, 223, 255, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.dirBtn { font-size: 20px; padding: 0; }

.actions { display: flex; gap: 8px; }

.hint {
  font-size: 12px;
  color: var(--text-mute);
  text-align: center;
  margin: 4px auto 0;
  letter-spacing: 0.3px;
}

@media (max-width: 480px) {
  .topbar h1 { font-size: 18px; letter-spacing: 4px; }
  .dpad { grid-template-columns: repeat(3, 48px); grid-template-rows: repeat(2, 48px); }
  button { padding: 9px 12px; font-size: 14px; }
  .hint { display: none; }

  #app {
    padding-top:    calc(18px + env(safe-area-inset-top));
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    gap: 12px;
  }

  .boardWrap {
    flex: 0 0 auto;
    min-height: 0;
    /* Anchor topbar to top, footer to bottom, center the board between. */
    margin-top: auto;
    margin-bottom: auto;
  }

  .topbar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "title date"
      "tabs  music";
    align-items: center;
    gap: 4px 8px;
  }
  .topbar h1        { grid-area: title; min-width: 0; justify-self: start; }
  .dateNav          { grid-area: date;  justify-self: end; }
  .dateLabel        { min-width: 0; }
  .topRightCluster  { display: contents; }
  .modeTabs         { grid-area: tabs;  justify-self: start; }
  .iconBtns         { grid-area: music; justify-self: end; }
}