/* sound/sound-game.css - Styles scoped to the Sound game page.
   Assumes base.css is already loaded via <link>. */

/* ── Layout ──────────────────────────────────────────────────────────────── */

.game-wrapper {
  display: flex;
  flex-direction: column;
  position: relative;
  height: calc(100vh - 57px);
  height: calc(100dvh - 57px);
}

.game-wrapper--mp {
  height: calc(100vh - 57px - 36px);
  height: calc(100dvh - 57px - 36px);
}

/* ── Phase panels ────────────────────────────────────────────────────────── */

.phase {
  position: absolute;
  inset: 0;
  display: none;
}

.phase.active {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  padding: var(--space-8);
  animation: phase-in 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.phase.phase-exiting {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  padding: var(--space-8);
  animation: phase-out 0.2s ease-in forwards;
  pointer-events: none;
}

@keyframes phase-in {
  0%   { opacity: 0;    transform: translateY(12px) translateX(0); }
  25%  { opacity: 0.6;  transform: translateY(5px)  translateX(-4px); }
  55%  { opacity: 0.85; transform: translateY(2px)  translateX(3px); }
  80%  { opacity: 0.95; transform: translateY(1px)  translateX(-1px); }
  100% { opacity: 1;    transform: translateY(0)    translateX(0); }
}

@keyframes phase-out {
  from { opacity: 1; transform: translateY(0); }
  to   { opacity: 0; transform: translateY(-10px); }
}

/* ── Pre-game countdown overlay ─────────────────────────────────────────── */

.start-countdown-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.start-countdown-overlay[hidden] {
  display: none;
}

.start-countdown-number {
  font-size: clamp(6rem, 22vw, 14rem);
  font-weight: 800;
  color: #fff;
  line-height: 1;
  animation: start-cd-pop 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes start-cd-pop {
  0%   { opacity: 0; transform: scale(1.8); }
  20%  { opacity: 1; transform: scale(0.92); }
  50%  { opacity: 1; transform: scale(1); }
  85%  { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(0.6); }
}

/* ── Idle phase ──────────────────────────────────────────────────────────── */

.game-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.game-subtitle {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 300px;
  line-height: 1.6;
}

.mode-cards {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.mode-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  width: 160px;
  height: 120px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  cursor: pointer;
  letter-spacing: 0.01em;
  transition:
    border-color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.mode-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.mode-card:hover {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-surface) 70%, var(--color-accent));
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(124, 106, 247, 0.18);
}

.mode-card:disabled {
  cursor: not-allowed;
  color: var(--color-text-secondary);
  opacity: 0.55;
  pointer-events: none;
}

/* ── Game settings (idle phase) ──────────────────────────────────────────── */

.game-settings {
  display: flex;
  gap: var(--space-4) var(--space-6);
  align-items: flex-start;
  flex-wrap: wrap;
  justify-content: center;
}

.settings-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.settings-label {
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.settings-chips {
  display: flex;
  gap: var(--space-1);
}

.settings-chip {
  padding: var(--space-1) var(--space-3);
  font-size: 0.8125rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.settings-chip:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-secondary);
}

.settings-chip--active {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-surface) 60%, var(--color-accent));
}

/* ── Shared: game card (memorize + input) ────────────────────────────────── */

/* Portrait card that holds the waveform canvas */
.sound-card {
  position: relative;
  width: min(320px, calc(100vw - 64px));
  height: min(440px, calc(100vh - 260px));
  height: min(440px, calc(100dvh - 260px));
  background: #0a0a0a;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
  flex-shrink: 0;
}

/* Waveform canvas fills the card */
.waveform-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: ew-resize;
}

/* Round indicator - top-left corner of card */
.card-round-label {
  position: absolute;
  top: var(--space-4);
  left: var(--space-4);
  font-size: 0.6875rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.06em;
  pointer-events: none;
  z-index: 2;
}

/* ── Memorize phase ──────────────────────────────────────────────────────── */



/* Countdown pill - below card */
.countdown {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: rgba(255, 255, 255, 0.7);
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  padding: 5px 14px;
  transition: color 0.35s ease, box-shadow 0.35s ease, font-size 0.2s ease;
  animation: countdown-float 2.2s ease-in-out infinite;
}

.countdown.pop {
  animation:
    countdown-float 2.2s ease-in-out infinite,
    countdown-pop   0.42s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes countdown-float {
  0%, 100% { translate: 0 0; }
  50%       { translate: 0 -5px; }
}

@keyframes countdown-pop {
  0%   { scale: 1.9; opacity: 0; filter: blur(4px); }
  55%  { scale: 0.92; opacity: 1; filter: blur(0); }
  78%  { scale: 1.03; }
  100% { scale: 1; }
}

.countdown[data-n="3"] { color: #e6c229; }
.countdown[data-n="2"] { color: #e88030; }
.countdown[data-n="1"] { color: #ff3c3c; }

/* ── Input phase ─────────────────────────────────────────────────────────── */

.round-label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Live Hz readout - bottom-left of card */
.hz-display {
  position: absolute;
  bottom: var(--space-5);
  left: var(--space-5);
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 7vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: rgba(255, 255, 255, 0.88);
  pointer-events: none;
  z-index: 2;
  text-shadow: 0 0 24px rgba(120, 210, 240, 0.3);
  transition: color 0.08s ease;
}

.hz-display .hz-unit {
  font-size: 0.45em;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: 0.04em;
  margin-left: 3px;
}


/* Input countdown (shown when select timer > 0) */
.input-countdown {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

.input-countdown[data-n="2"],
.input-countdown[data-n="1"] {
  color: #e88030;
}

/* Drag hint - fades in then out */
.drag-hint {
  position: absolute;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  font-size: clamp(0.5rem, 2.5vw, 0.75rem);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
  pointer-events: none;
  z-index: 2;
  animation: hint-fade 3s 0.5s ease both;
}

@keyframes hint-fade {
  0%   { opacity: 0; }
  15%  { opacity: 1; }
  75%  { opacity: 1; }
  100% { opacity: 0; }
}

/* ── Game action button (used in non-card phases) ─────────────────────────── */

.btn-game {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-8);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  transition:
    background   var(--transition-fast),
    transform    120ms cubic-bezier(0.34, 1.56, 0.64, 1),
    box-shadow   var(--transition-fast);
  box-shadow: 0 0 0 rgba(124, 106, 247, 0);
}

.btn-game:hover {
  background: var(--color-accent-hover);
  transform: scale(1.04);
  box-shadow: 0 6px 28px rgba(124, 106, 247, 0.45);
}

.btn-game:active {
  transform: scale(0.96);
  box-shadow: none;
}

/* ── Result phase ────────────────────────────────────────────────────────── */

.result-cards {
  display: flex;
  gap: var(--space-4);
}

@keyframes card-in {
  from { transform: translateY(22px) scale(0.94); opacity: 0; }
  to   { transform: none; opacity: 1; }
}

/* Sound result cards - dark bg with waveform colour accents */
.result-card {
  width: 160px;
  height: 220px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  animation: card-in 0.45s cubic-bezier(0.22, 1, 0.36, 1) both;
  background: #0d0d0d;
  border: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.result-card:last-child {
  animation-delay: 0.08s;
}

/* Mini waveform in result card background */
.result-card-waveform {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.5;
  pointer-events: none;
}

.result-card-body {
  position: relative;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 1;
}

.result-card-title {
  font-size: 0.5625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.4);
}

.result-freq-val {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1;
}

.result-freq-unit {
  font-size: 0.6em;
  color: rgba(255, 255, 255, 0.45);
  margin-left: 2px;
  font-weight: 600;
}

.result-cents-diff {
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.4);
  font-weight: 500;
}

.score-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.score-badge {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
}

.score-badge--success { color: var(--color-score-success); }
.score-badge--mid     { color: var(--color-text-primary); }
.score-badge--failure { color: var(--color-score-failure); }

.score-badge--settled {
  animation: score-pop 0.55s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes score-pop {
  0%   { scale: 0.4; opacity: 0; }
  65%  { scale: 1.12; }
  100% { scale: 1;   opacity: 1; }
}

.score-label--appear {
  animation: label-appear 0.35s ease both;
}

@keyframes label-appear {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.score-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.result-extras {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  min-height: 28px;
}

.perfect-badge,
.streak-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  animation: badge-pop 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.perfect-badge {
  background: color-mix(in srgb, var(--color-score-success) 18%, transparent);
  color: var(--color-score-success);
  border: 1px solid var(--color-score-success);
}

.streak-badge {
  background: color-mix(in srgb, #e88030 18%, transparent);
  color: #e88030;
  border: 1px solid #e88030;
}

@keyframes badge-pop {
  from { scale: 0.5; opacity: 0; }
  to   { scale: 1;   opacity: 1; }
}

.next-btn { /* inherits .btn-game */ }

.mp-waiting-hint {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

/* MP reveal panel */
.mp-reveal-panel {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.mp-reveal-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
}

.mp-reveal-freq {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.mp-reveal-name {
  font-size: 0.625rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.06em;
}

.mp-reveal-score {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

/* ── Complete phase ──────────────────────────────────────────────────────── */

.complete-total {
  text-align: center;
}

.total-score-value {
  font-family: var(--font-mono);
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-score-success);
}

.total-score-max {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.total-score-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.complete-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  min-height: 20px;
}

.pb-info, .daily-streak-info, .session-improvement {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: 0.02em;
}

.pb-info--new {
  color: var(--color-score-success);
}

.round-breakdown {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.breakdown-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  animation: breakdown-in 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes breakdown-in {
  from { opacity: 0; transform: translateY(12px) scale(0.9); }
  to   { opacity: 1; transform: none; }
}

.breakdown-score {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid currentColor;
}

.breakdown-score.score-badge--success { color: var(--color-score-success); }
.breakdown-score.score-badge--mid     { color: var(--color-text-primary); border-color: var(--color-border); }
.breakdown-score.score-badge--failure { color: var(--color-score-failure); }

.breakdown-round {
  font-size: 0.5625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

.round-breakdown--leaderboard {
  flex-direction: column;
  gap: var(--space-2);
  align-items: stretch;
  width: 100%;
  max-width: 320px;
}

.mp-result-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  animation: breakdown-in 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.mp-result-row--winner {
  border-color: var(--color-score-success);
  background: color-mix(in srgb, var(--color-surface) 80%, var(--color-score-success));
}

.mp-result-rank  { font-size: 1.1rem; }
.mp-result-name  { flex: 1; font-size: 0.875rem; font-weight: 600; }
.mp-result-score { font-family: var(--font-mono); font-size: 0.875rem; font-weight: 700; }

.share-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.complete-actions {
  display: flex;
  gap: var(--space-3);
}

.save-score-banner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 0.8125rem;
  max-width: 340px;
  text-align: center;
}

.save-score-banner[hidden] { display: none; }

.save-score-banner__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  flex: 1;
}

.save-score-dismiss {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0 var(--space-1);
  flex-shrink: 0;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: var(--space-3) var(--space-6);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.btn-secondary:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-secondary);
  background: var(--color-surface);
}

/* ── Lobby phase ─────────────────────────────────────────────────────────── */

.lobby-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.lobby-mode-row {
  display: flex;
  gap: var(--space-3);
}

.lobby-code-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.room-code-display {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--color-text-primary);
}

.lobby-join-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.lobby-code-input {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-align: center;
  width: 200px;
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  text-transform: uppercase;
}

.lobby-error {
  font-size: 0.8125rem;
  color: var(--color-score-failure);
}

.lobby-error[hidden] { display: none; }

.lobby-players {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
  max-width: 240px;
}

.lobby-player {
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
}

.lobby-hint {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

.lobby-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

/* ── Multiplayer strip ───────────────────────────────────────────────────── */

.mp-players {
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.mp-players[hidden] { display: none; }

.mp-player {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.mp-player--disconnected {
  opacity: 0.4;
  text-decoration: line-through;
}

.mp-player-score {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-score-success);
}

/* ── Juice ───────────────────────────────────────────────────────────────── */

.particle {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  animation: particle-burst 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  transform-origin: center;
}

@keyframes particle-burst {
  0%   { transform: translate(0, 0) scale(1); opacity: 1; }
  100% { transform: translate(var(--dx), var(--dy)) scale(0); opacity: 0; }
}

.score-float {
  position: fixed;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  pointer-events: none;
  z-index: 9999;
  transform: translateX(-50%);
  animation: score-float-up 1s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.score-float--great { color: var(--color-score-success); }
.score-float--mid   { color: var(--color-text-primary); }
.score-float--low   { color: var(--color-score-failure); }

@keyframes score-float-up {
  0%   { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(-60px); }
}

.screen-wash {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  animation: screen-wash 0.5s ease forwards;
}

.screen-wash--great { background: rgba(80, 220, 120, 0.12); }
.screen-wash--mid   { background: rgba(200, 200, 200, 0.07); }
.screen-wash--low   { background: rgba(220, 60, 60, 0.1); }

@keyframes screen-wash {
  0%   { opacity: 1; }
  100% { opacity: 0; }
}

.screen-shake {
  animation: screen-shake 0.35s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@keyframes screen-shake {
  10%, 90%  { transform: translate3d(-2px, 0, 0); }
  20%, 80%  { transform: translate3d(3px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-3px, 0, 0); }
  40%, 60%  { transform: translate3d(3px, 0, 0); }
}