/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:      #0A0F1E;
  --accent:  #06B6D4;
  --success: #10B981;
  --warning: #F59E0B;
  --danger:  #F43F5E;
  --text:    #F8FAFC;
  --muted:   #94A3B8;
  --border:  rgba(148,163,184,0.10);

  /* Mobile-safe spacing */
  --safe-top:    env(safe-area-inset-top,    0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left:   env(safe-area-inset-left,   0px);
  --safe-right:  env(safe-area-inset-right,  0px);
}

html {
  height: 100%;
  /* Prevent iOS rubber-band overscroll from revealing white */
  background: var(--bg);
}

body {
  height: 100%;
  min-height: 100dvh; /* Dynamic viewport height — handles mobile browser chrome */
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent; /* Remove tap flash on mobile */
  touch-action: manipulation;              /* Prevent double-tap zoom */
}

/* ── Canvas ─────────────────────────────────────────────────── */
#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

/* ── Score HUD — top right ──────────────────────────────────── */
#score-hud {
  position: fixed;
  top: calc(0.9rem + var(--safe-top));
  right: calc(0.9rem + var(--safe-right));
  z-index: 20;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.2rem;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
  background: rgba(10,15,30,0.70);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 0.65rem 0.85rem;
  /* Scale down on very small screens */
  max-width: min(160px, 38vw);
}
#score-hud.visible { opacity: 1; }

.hud-top-label {
  font-size: clamp(0.48rem, 1.5vw, 0.58rem);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.hud-best-val {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.3rem, 4.5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
}
.hud-divider { width: 100%; height: 1px; background: var(--border); margin: 0.28rem 0; }
.hud-sub { display: flex; gap: 0.75rem; }
.hud-sub-item { display: flex; flex-direction: column; align-items: flex-end; gap: 0.05rem; }
.hud-sub-val {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(0.65rem, 2vw, 0.8rem);
  font-weight: 700;
  color: var(--text);
}
.hud-sub-lbl {
  font-size: clamp(0.44rem, 1.3vw, 0.55rem);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── App layout — true centered, safe-area aware ────────────── */
#app {
  position: relative;
  z-index: 10;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding:
    calc(1rem + var(--safe-top))
    calc(1rem + var(--safe-right))
    calc(1rem + var(--safe-bottom))
    calc(1rem + var(--safe-left));
}

/* ── Card ───────────────────────────────────────────────────── */
.card {
  background: rgba(17, 24, 39, 0.70);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  border-radius: clamp(0.9rem, 3vw, 1.25rem);
  padding: clamp(1.4rem, 4vw, 2rem) clamp(1.2rem, 4vw, 1.75rem);
  width: 100%;
  /* Never too wide, never overflow on small screens */
  max-width: min(350px, calc(100vw - 2rem));
  text-align: center;
  box-shadow: 0 20px 50px rgba(0,0,0,0.65), 0 0 0 1px rgba(255,255,255,0.03);
}

/* ── Typography ─────────────────────────────────────────────── */
.font-display { font-family: 'Space Grotesk', sans-serif; }

h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.4rem;
}
h1 span { color: var(--accent); }

.subtitle {
  color: var(--muted);
  font-size: clamp(0.8rem, 2.5vw, 0.88rem);
  line-height: 1.6;
  margin-bottom: clamp(1.2rem, 4vw, 1.75rem);
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(0.88rem, 2.5vw, 0.95rem);
  letter-spacing: 0.02em;
  padding: clamp(0.65rem, 2vw, 0.75rem) clamp(1.4rem, 4vw, 1.9rem);
  border-radius: 0.65rem;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  display: inline-block;
  /* Minimum touch target 44px */
  min-height: 44px;
  min-width: 44px;
}
.btn:hover  { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.btn:active { transform: scale(0.97); box-shadow: none; }
.btn-primary { background: var(--accent); color: #0A0F1E; }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ── Stats row ──────────────────────────────────────────────── */
.stats-row {
  display: flex;
  justify-content: center;
  gap: clamp(1rem, 3vw, 1.5rem);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.stat-item  { display: flex; flex-direction: column; gap: 0.15rem; }
.stat-label { font-size: clamp(0.58rem, 1.8vw, 0.65rem); font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.stat-value { font-family: 'Space Grotesk', sans-serif; font-size: clamp(0.9rem, 2.5vw, 1rem); font-weight: 700; }

.divider { width: 36px; height: 2px; background: var(--border); border-radius: 2px; margin: 1.25rem auto; }

/* ── Waiting state ──────────────────────────────────────────── */
.wait-icon {
  font-size: clamp(2rem, 6vw, 2.5rem);
  margin-bottom: 0.75rem;
  display: block;
  animation: pulse-icon 1.6s ease-in-out infinite;
}
@keyframes pulse-icon { 0%,100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.1); opacity: 0.65; } }
.warning-text { color: var(--warning); font-size: clamp(0.72rem, 2.2vw, 0.8rem); font-weight: 600; margin-top: 0.6rem; min-height: 1.1rem; }

/* ── Stimulus state ─────────────────────────────────────────── */
#state-stimulus .card {
  background: rgba(6,182,212,0.12);
  border-color: rgba(6,182,212,0.35);
  animation: stim-pop 0.35s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes stim-pop { 0% { transform: scale(0.92); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }

.go-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(2.8rem, 12vw, 4.5rem);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 0.4rem;
  animation: go-bounce 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes go-bounce { 0% { transform: scale(0.4); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }
.go-sub { color: var(--muted); font-size: clamp(0.78rem, 2.2vw, 0.85rem); margin-bottom: 1.25rem; }

/* ── Results state ──────────────────────────────────────────── */
.result-time {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(3rem, 14vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 0.15rem;
  transition: color 0.4s;
}
.result-ms    { font-family: 'Space Grotesk', sans-serif; font-size: clamp(0.75rem, 2vw, 0.85rem); font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: 0.6rem; }
.result-label { font-family: 'Space Grotesk', sans-serif; font-size: clamp(0.88rem, 2.5vw, 1rem); font-weight: 700; margin-bottom: 1.25rem; }
.result-buttons { display: flex; gap: 0.6rem; justify-content: center; flex-wrap: wrap; }

/* ── Performance colours ────────────────────────────────────── */
.perf-excellent { color: var(--accent);  }
.perf-good      { color: var(--success); }
.perf-average   { color: var(--warning); }
.perf-slow      { color: var(--danger);  }

/* ── 2D particle overlay canvas ─────────────────────────────── */
#fx-canvas {
  position: fixed;
  inset: 0;
  z-index: 9;          /* above Three.js, below UI */
  pointer-events: none;
  width: 100%;
  height: 100%;
}

/* ── Panel transitions — slide-fade ─────────────────────────── */
.state-panel {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  /* Hidden by default */
  opacity: 0;
  pointer-events: none;
  position: absolute;
  inset: 0;
  /* Exit animation */
  transform: translateY(12px) scale(0.97);
  transition: opacity 0.28s ease, transform 0.28s cubic-bezier(0.4,0,0.2,1);
}
.state-panel.active {
  opacity: 1;
  pointer-events: auto;
  position: relative;
  transform: translateY(0) scale(1);
}
/* Entering — panels slide up into position */
.state-panel.entering {
  transform: translateY(20px) scale(0.96);
  opacity: 0;
  animation: panel-enter 0.38s cubic-bezier(0.34,1.3,0.64,1) forwards;
}
@keyframes panel-enter {
  to { transform: translateY(0) scale(1); opacity: 1; }
}

/* ── Card shimmer / glint effect ────────────────────────────── */
.card {
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  top: -60%;
  left: -80%;
  width: 60%;
  height: 200%;
  background: linear-gradient(
    105deg,
    transparent 30%,
    rgba(255,255,255,0.055) 50%,
    transparent 70%
  );
  transform: skewX(-15deg);
  pointer-events: none;
  opacity: 0;
  transition: none;
}
.card.glint::before {
  animation: glint-sweep 0.7s ease-out forwards;
}
@keyframes glint-sweep {
  0%   { left: -80%; opacity: 1; }
  100% { left: 160%;  opacity: 0; }
}

/* ── Screen flash on GO ─────────────────────────────────────── */
#screen-flash {
  position: fixed;
  inset: 0;
  z-index: 8;
  pointer-events: none;
  opacity: 0;
  background: radial-gradient(ellipse at center, rgba(6,182,212,0.35) 0%, transparent 70%);
}
#screen-flash.flash {
  animation: screen-flash 0.5s ease-out forwards;
}
@keyframes screen-flash {
  0%   { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Screenshake on GO ──────────────────────────────────────── */
@keyframes screenshake {
  0%,100% { transform: translate(0,0); }
  15%     { transform: translate(-4px, 2px); }
  30%     { transform: translate(4px, -3px); }
  45%     { transform: translate(-3px, 4px); }
  60%     { transform: translate(3px, -2px); }
  75%     { transform: translate(-2px, 1px); }
}
body.shake #app { animation: screenshake 0.35s ease-out; }

/* ── Ripple effect on tap button ────────────────────────────── */
.ripple-host { position: relative; overflow: hidden; }
.ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: rgba(255,255,255,0.35);
  animation: ripple-out 0.55s ease-out forwards;
  pointer-events: none;
}
@keyframes ripple-out {
  to { transform: scale(4); opacity: 0; }
}

/* ── Round dots — upgraded with pop animation ───────────────── */
.rounds-dots { display: flex; gap: 0.45rem; justify-content: center; margin-bottom: 1.25rem; }
.dot {
  width: clamp(7px, 2.2vw, 9px);
  height: clamp(7px, 2.2vw, 9px);
  border-radius: 50%;
  background: var(--border);
  border: 1px solid var(--muted);
  transition: background 0.3s, border-color 0.3s, transform 0.3s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.3s;
}
.dot.filled {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(6,182,212,0.6);
  transform: scale(1.25);
}
.dot.pop { animation: dot-pop 0.4s cubic-bezier(0.34,1.56,0.64,1); }
@keyframes dot-pop {
  0%   { transform: scale(0.5); }
  60%  { transform: scale(1.5); }
  100% { transform: scale(1.25); }
}

/* ── Result time — count-up number reveal ───────────────────── */
.result-time { font-variant-numeric: tabular-nums; }

/* Number reveal animation */
@keyframes num-reveal {
  0%   { opacity: 0; transform: translateY(18px) scale(0.85); }
  60%  { opacity: 1; transform: translateY(-4px) scale(1.03); }
  100% { transform: translateY(0) scale(1); }
}
.result-time.revealed { animation: num-reveal 0.45s cubic-bezier(0.34,1.2,0.64,1); }

/* ── Performance glow ring behind result number ─────────────── */
.result-time-wrap {
  position: relative;
  display: inline-block;
}
.result-glow-ring {
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
}
.result-glow-ring.glow-excellent { background: radial-gradient(circle, rgba(6,182,212,0.28) 0%, transparent 65%); animation: glow-pulse 1.2s ease-in-out infinite alternate; }
.result-glow-ring.glow-good      { background: radial-gradient(circle, rgba(16,185,129,0.25) 0%, transparent 65%); animation: glow-pulse 1.4s ease-in-out infinite alternate; }
.result-glow-ring.glow-average   { background: radial-gradient(circle, rgba(245,158,11,0.22) 0%, transparent 65%); animation: glow-pulse 1.6s ease-in-out infinite alternate; }
.result-glow-ring.glow-slow      { background: radial-gradient(circle, rgba(244,63,94,0.20) 0%, transparent 65%); animation: glow-pulse 1.8s ease-in-out infinite alternate; }
@keyframes glow-pulse {
  from { opacity: 0.6; transform: scale(0.92); }
  to   { opacity: 1.0; transform: scale(1.08); }
}

/* ── Idle title animated gradient ───────────────────────────── */
h1 span {
  color: var(--accent);
  background: linear-gradient(90deg, #06B6D4 0%, #818cf8 40%, #06B6D4 80%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: text-shine 4s linear infinite;
}
@keyframes text-shine {
  0%   { background-position: 0% center; }
  100% { background-position: 200% center; }
}

/* ── Waiting — tension ring around icon ─────────────────────── */
.wait-ring-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 0.75rem;
}
.wait-ring {
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1.5px solid rgba(6,182,212,0.3);
  animation: ring-expand 1.8s ease-in-out infinite;
}
.wait-ring:nth-child(2) { animation-delay: 0.6s; }
.wait-ring:nth-child(3) { animation-delay: 1.2s; }
@keyframes ring-expand {
  0%   { transform: scale(0.8); opacity: 0.8; }
  100% { transform: scale(2.2); opacity: 0; }
}
.wait-icon { margin-bottom: 0; }  /* margin moved to wrap */

/* ── GO! — radial burst overlay ────────────────────────────── */
.go-text {
  position: relative;
  display: inline-block;
}
.go-text::after {
  content: '';
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,0.5) 0%, transparent 70%);
  animation: go-radial 0.6s ease-out forwards;
  pointer-events: none;
}
@keyframes go-radial {
  0%   { transform: scale(0.3); opacity: 1; }
  100% { transform: scale(3.5); opacity: 0; }
}

/* ── XP bar flash on earn ───────────────────────────────────── */
.lhud-xp-fill.flash-earn {
  animation: xp-flash 0.5s ease-out;
}
@keyframes xp-flash {
  0%,100% { filter: brightness(1); }
  40%     { filter: brightness(2.5); }
}

/* ── Stat counters — stagger reveal on result ───────────────── */
.stat-value {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.34,1.2,0.64,1);
}
.stats-row.revealed .stat-value { opacity: 1; transform: none; }
.stats-row.revealed .stat-item:nth-child(1) .stat-value { transition-delay: 0.05s; }
.stats-row.revealed .stat-item:nth-child(2) .stat-value { transition-delay: 0.12s; }
.stats-row.revealed .stat-item:nth-child(3) .stat-value { transition-delay: 0.19s; }

/* ── Difficulty button — hover micro-lift ───────────────────── */
.diff-btn {
  transition: all 0.18s cubic-bezier(0.34,1.3,0.64,1);
}
.diff-btn:hover { transform: translateY(-2px) scale(1.03); }
.diff-btn:active { transform: scale(0.97); }
.diff-btn.selected { transform: scale(1.02); }

/* ── Best badge pop-in ──────────────────────────────────────── */
.best-badge {
  display: inline-block;
  font-size: clamp(0.6rem, 1.8vw, 0.68rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(6,182,212,0.1);
  border: 1px solid rgba(6,182,212,0.22);
  border-radius: 2rem;
  padding: 0.18rem 0.6rem;
  margin-bottom: 0.85rem;
  animation: badge-pop 0.45s cubic-bezier(0.34,1.56,0.64,1) both;
}
@keyframes badge-pop {
  from { transform: scale(0.5) rotate(-8deg); opacity: 0; }
  to   { transform: scale(1)   rotate(0deg);  opacity: 1; }
}

/* ── Difficulty selector ─────────────────────────────────────── */
.diff-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}
.diff-btn {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(0.75rem, 2.2vw, 0.82rem);
  border-radius: 0.6rem;
  border: 1.5px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--muted);
  cursor: pointer;
  padding: 0.55rem 0.5rem 0.4rem;
  transition: all 0.18s ease;
  text-align: center;
  min-height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}
.diff-btn:hover { border-color: var(--accent); color: var(--text); background: rgba(6,182,212,0.06); }
.diff-btn.selected { border-color: currentColor; color: var(--text); background: rgba(6,182,212,0.10); }
.diff-btn .diff-icon  { font-size: 1.1rem; line-height: 1; }
.diff-btn .diff-name  { font-size: clamp(0.72rem, 2vw, 0.8rem); font-weight: 700; }
.diff-btn .diff-range { font-size: clamp(0.58rem, 1.6vw, 0.64rem); font-weight: 500; opacity: 0.7; }

/* Difficulty accent colours */
.diff-btn[data-diff="novice"]   { --dc: #10B981; }
.diff-btn[data-diff="warrior"]  { --dc: #06B6D4; }
.diff-btn[data-diff="hunter"]   { --dc: #F59E0B; }
.diff-btn[data-diff="legend"]   { --dc: #F43F5E; }
.diff-btn.selected { color: var(--dc, var(--accent)); border-color: var(--dc, var(--accent)); background: color-mix(in srgb, var(--dc, var(--accent)) 12%, transparent); }

/* ── XP / Level bar ──────────────────────────────────────────── */
#level-hud {
  position: fixed;
  bottom: calc(0.9rem + var(--safe-bottom));
  left: calc(0.9rem + var(--safe-left));
  z-index: 20;
  pointer-events: none;
  background: rgba(10,15,30,0.70);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 0.85rem;
  padding: 0.65rem 0.9rem;
  min-width: clamp(130px, 28vw, 180px);
  opacity: 0;
  transition: opacity 0.5s ease;
}
#level-hud.visible { opacity: 1; }

.lhud-row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 0.3rem; }
.lhud-level {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(0.8rem, 2.5vw, 0.95rem);
  font-weight: 800;
  color: var(--text);
}
.lhud-title {
  font-size: clamp(0.52rem, 1.5vw, 0.6rem);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.lhud-xp-track {
  width: 100%;
  height: 5px;
  background: rgba(255,255,255,0.07);
  border-radius: 99px;
  overflow: hidden;
}
.lhud-xp-fill {
  height: 100%;
  border-radius: 99px;
  background: var(--accent);
  transition: width 0.6s cubic-bezier(0.34,1.2,0.64,1), background 0.4s;
  width: 0%;
}
.lhud-xp-label {
  font-size: clamp(0.48rem, 1.4vw, 0.56rem);
  font-weight: 600;
  color: var(--muted);
  margin-top: 0.28rem;
  text-align: right;
}

/* ── Level-up overlay ────────────────────────────────────────── */
#levelup-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}
#levelup-overlay.show { opacity: 1; pointer-events: auto; }

.levelup-card {
  background: rgba(17,24,39,0.92);
  border: 1px solid rgba(6,182,212,0.35);
  border-radius: 1.4rem;
  padding: 2.2rem 2rem;
  text-align: center;
  max-width: min(320px, calc(100vw - 2rem));
  box-shadow: 0 0 60px rgba(6,182,212,0.2), 0 20px 40px rgba(0,0,0,0.6);
  animation: levelup-pop 0.5s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes levelup-pop { 0% { transform: scale(0.7); opacity: 0; } 100% { transform: scale(1); opacity: 1; } }

.levelup-burst { font-size: 3rem; margin-bottom: 0.5rem; animation: spin-burst 0.6s ease-out; }
@keyframes spin-burst { 0% { transform: rotate(-30deg) scale(0.5); } 100% { transform: rotate(0) scale(1); } }

.levelup-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.4rem, 5vw, 1.9rem);
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}
.levelup-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1rem, 3.5vw, 1.3rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.levelup-desc {
  font-size: clamp(0.78rem, 2.2vw, 0.85rem);
  color: var(--muted);
  line-height: 1.5;
  margin-bottom: 1.4rem;
}
.levelup-stat {
  display: inline-block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.7rem;
  border-radius: 2rem;
  background: rgba(6,182,212,0.12);
  border: 1px solid rgba(6,182,212,0.22);
  color: var(--accent);
  margin-bottom: 1.2rem;
}

/* ── Difficulty badge in waiting/results ─────────────────────── */
.diff-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: clamp(0.58rem, 1.7vw, 0.65rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.18rem 0.6rem;
  border-radius: 2rem;
  border: 1px solid currentColor;
  margin-bottom: 0.6rem;
  opacity: 0.85;
}

/* ── Settings toggle button — top left ──────────────────────── */
#settings-btn {
  position: fixed;
  top: calc(0.9rem + var(--safe-top));
  left: calc(0.9rem + var(--safe-left));
  z-index: 30;
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(10,15,30,0.70);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  color: var(--muted);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.2s, color 0.2s, transform 0.3s;
  -webkit-tap-highlight-color: transparent;
}
#settings-btn:hover { border-color: var(--accent); color: var(--accent); }
#settings-btn.open  { transform: rotate(45deg); color: var(--accent); border-color: var(--accent); }

/* ── Settings panel ─────────────────────────────────────────── */
#settings-panel {
  position: fixed;
  top: calc(3.4rem + var(--safe-top));
  left: calc(0.9rem + var(--safe-left));
  z-index: 30;
  background: rgba(10,15,30,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1rem 1.1rem;
  width: clamp(190px, 44vw, 230px);
  transform: scale(0.92) translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s cubic-bezier(0.34,1.3,0.64,1);
  transform-origin: top left;
}
#settings-panel.open {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1) translateY(0);
}

.settings-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border);
}
.settings-row:last-child { border-bottom: none; padding-bottom: 0; }

.settings-row-label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: clamp(0.75rem, 2.2vw, 0.82rem);
  font-weight: 600;
  color: var(--text);
}
.settings-row-label span { font-size: 0.95rem; }

/* Volume slider */
.vol-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 70px; height: 4px;
  border-radius: 99px;
  background: rgba(255,255,255,0.1);
  outline: none;
  cursor: pointer;
  accent-color: var(--accent);
}
.vol-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 6px rgba(6,182,212,0.5);
}

/* Toggle switch */
.toggle-wrap { display: flex; align-items: center; }
.toggle {
  position: relative;
  width: 36px; height: 20px;
  display: inline-block;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-track {
  position: absolute; inset: 0;
  background: rgba(255,255,255,0.1);
  border-radius: 99px;
  border: 1px solid var(--border);
  transition: background 0.25s;
}
.toggle input:checked + .toggle-track { background: var(--accent); border-color: var(--accent); }
.toggle-thumb {
  position: absolute;
  top: 2px; left: 2px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.25s cubic-bezier(0.34,1.3,0.64,1);
  pointer-events: none;
}
.toggle input:checked ~ .toggle-thumb { transform: translateX(16px); }

/* Visualiser bar — tiny live waveform indicator when music plays */
#music-viz {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 14px;
  margin-left: 4px;
}
#music-viz span {
  display: block;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.7;
  animation: viz-bar 0.8s ease-in-out infinite alternate;
}
#music-viz span:nth-child(1) { animation-delay: 0s;    height: 4px; }
#music-viz span:nth-child(2) { animation-delay: 0.15s; height: 8px; }
#music-viz span:nth-child(3) { animation-delay: 0.3s;  height: 6px; }
#music-viz span:nth-child(4) { animation-delay: 0.1s;  height: 10px; }
#music-viz span:nth-child(5) { animation-delay: 0.25s; height: 5px; }
@keyframes viz-bar {
  from { transform: scaleY(0.3); opacity: 0.4; }
  to   { transform: scaleY(1.0); opacity: 0.9; }
}
#music-viz.paused span { animation-play-state: paused; opacity: 0.25; }

/* ── Landscape mobile: scale down card, show shapes ────────── */
@media (max-height: 500px) and (orientation: landscape) {
  .card { padding: 1rem 1.4rem; }
  h1 { font-size: 1.2rem; margin-bottom: 0.2rem; }
  .subtitle { margin-bottom: 0.8rem; font-size: 0.78rem; }
  .wait-icon { font-size: 1.6rem; margin-bottom: 0.4rem; }
  .divider { margin: 0.75rem auto; }
  .stats-row { margin-bottom: 0.8rem; gap: 0.75rem; }
  .result-time { font-size: 2.5rem; }
}

/* ── Portrait phone: full-width comfortable card ────────────── */
@media (max-width: 480px) {
  .card { max-width: calc(100vw - 1.5rem); border-radius: 1rem; }
  #score-hud { padding: 0.5rem 0.7rem; border-radius: 0.7rem; }
  #settings-panel { width: calc(100vw - 2rem); }
}