:root {
  --font-mono: "Space Mono", "JetBrains Mono", "DejaVu Sans Mono", monospace;
  --font-term: "VT323", "Space Mono", monospace;
  --fs-base: 16px;
  --fs-nick: clamp(3rem, 13vw, 9.5rem);
  --fs-tagline: clamp(0.95rem, 2.3vw, 1.3rem);
  --fs-contact: clamp(1rem, 2vw, 1.4rem);
  --fs-tb: clamp(0.72rem, 1.2vw, 0.92rem);
  --fs-term: clamp(1rem, 2.4vw, 1.35rem);
  --radius: 2px;
  --gap: 1.25rem;
  --max-w: 1200px;
  --ease: cubic-bezier(.4,0,.2,1);
  --t-fast: 120ms;
  --t-med: 280ms;
  --t-slow: 600ms;
}

[data-theme="green"] {
  --bg: #060a08;
  --bg2: #0d1310;
  --bg3: #131a16;
  --fg: #4ade80;
  --accent: #22c55e;
  --muted: #5a6b62;
  --alert: #ff3355;
  --glow: 0 0 8px rgba(74,222,128,.35), 0 0 2px rgba(74,222,128,.8);
  --glow-strong: 0 0 14px rgba(74,222,128,.45), 0 0 3px rgba(74,222,128,.9);
  --glitch-r: rgba(255, 50, 100, 0.9);
  --glitch-b: rgba(0, 220, 255, 0.9);
  --rgb-r: 74;
  --rgb-g: 222;
  --rgb-b: 128;
  --rgb-r2: 34;
  --rgb-g2: 197;
  --rgb-b2: 94;
  --bg-rgb: 6,10,8;
  --scanline: rgba(74,222,128,.04);
}

[data-theme="pink"] {
  --bg: #0a0408;
  --bg2: #14080f;
  --bg3: #1a0a14;
  --fg: #ff5b9e;
  --accent: #c084fc;
  --muted: #7a5a6e;
  --alert: #ff3355;
  --glow: 0 0 8px rgba(255,91,158,.4), 0 0 2px rgba(255,91,158,.8);
  --glow-strong: 0 0 16px rgba(255,91,158,.5), 0 0 3px rgba(192,132,252,.9);
  --glitch-r: rgba(192, 132, 252, 0.95);
  --glitch-b: rgba(0, 220, 255, 0.85);
  --rgb-r: 255;
  --rgb-g: 91;
  --rgb-b: 158;
  --rgb-r2: 192;
  --rgb-g2: 132;
  --rgb-b2: 252;
  --bg-rgb: 10,4,8;
  --scanline: rgba(255,91,158,.04);
}
*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}
html, body { margin: 0; padding: 0; height: 100%; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: var(--fs-base);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background var(--t-slow) var(--ease), color var(--t-slow) var(--ease);
  /* subtle radial vignette for depth */
  background-image:
    radial-gradient(ellipse at 50% 0%, rgba(var(--rgb-r),var(--rgb-g),var(--rgb-b),.06) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 100%, rgba(var(--rgb-r2),var(--rgb-g2),var(--rgb-b2),.04) 0%, transparent 50%);
  background-attachment: fixed;
}
a { color: inherit; text-decoration: none; touch-action: manipulation; }
button { font: inherit; color: inherit; background: transparent; border: 0; cursor: pointer; padding: 0; touch-action: manipulation; }
input { font: inherit; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }
kbd {
  font: inherit;
  border: 1px solid currentColor;
  padding: 0 5px;
  border-radius: var(--radius);
  opacity: .75;
  font-size: .85em;
}
::selection { background: var(--fg); color: var(--bg); }
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; opacity: .5; }
#boot {
  position: fixed;
  inset: 0;
  background: var(--bg);
  color: var(--fg);
  z-index: 9999;
  padding: 5vmin 6vmin;
  font-family: var(--font-term);
  font-size: var(--fs-term);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  text-shadow: var(--glow);
  overflow: hidden;
  line-height: 1.25;
  /* CRT scanline overlay */
}
#boot::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    transparent 0,
    transparent 2px,
    var(--scanline) 2px,
    var(--scanline) 3px
  );
  z-index: 1;
}
#boot-lines {
  margin: 0;
  font-family: var(--font-term);
  white-space: pre-wrap;
  word-break: break-word;
  position: relative;
  z-index: 2;
}
#boot-cursor {
  display: inline-block;
  margin-top: 6px;
  color: var(--accent);
  text-shadow: var(--glow);
  position: relative;
  z-index: 2;
}
.blink { animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

#boot.fade-out {
  animation: bootOut 480ms var(--ease) forwards;
}
@keyframes bootOut {
  to { opacity: 0; transform: translateY(-2vmin); filter: blur(2px); }
}
#app { opacity: 0; transition: opacity var(--t-slow) var(--ease); }
#app.shown { opacity: 1; }
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px clamp(12px, 3vw, 28px);
  pointer-events: none;
}
.topbar > * { pointer-events: auto; }
.brand {
  font-size: var(--fs-tb);
  color: var(--muted);
  letter-spacing: .5px;
  transition: color var(--t-fast) var(--ease);
}
.brand:hover { color: var(--fg); text-shadow: var(--glow); }
.brand-dot { color: var(--accent); }
.topbar-right {
  display: flex;
  gap: 6px;
}
.tb {
  font-size: var(--fs-tb);
  color: var(--muted);
  padding: 4px 8px;
  border-radius: var(--radius);
  letter-spacing: .5px;
  opacity: .55;
  transition: opacity var(--t-fast) var(--ease), color var(--t-fast) var(--ease), text-shadow var(--t-fast) var(--ease);
}
.tb:hover, .tb:focus-visible {
  opacity: 1;
  color: var(--fg);
  text-shadow: var(--glow);
  outline: none;
}
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 5vmin 60px;
  position: relative;
  z-index: 5;
}
.hero-center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  max-width: var(--max-w);
}

/* nick with glitch */
.nick {
  font-family: var(--font-mono);
  font-size: var(--fs-nick);
  font-weight: 700;
  letter-spacing: -.04em;
  line-height: 1;
  margin: 0;
  color: var(--fg);
  text-shadow: var(--glow-strong);
  position: relative;
  user-select: none;
  cursor: default;
}
.nick::before, .nick::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  mix-blend-mode: screen;
}
.nick::before { color: var(--glitch-r); transform: translate(0,0); }
.nick::after  { color: var(--glitch-b); transform: translate(0,0); }
.nick.glitching::before {
  opacity: .9;
  animation: glitchA 320ms steps(2) 1;
}
.nick.glitching::after {
  opacity: .9;
  animation: glitchB 320ms steps(2) 1;
}
@keyframes glitchA {
  0%   { transform: translate(-2px, 0);   clip-path: inset(0 0 60% 0); }
  25%  { transform: translate(3px, -1px); clip-path: inset(40% 0 20% 0); }
  50%  { transform: translate(-3px, 1px); clip-path: inset(70% 0 5% 0); }
  75%  { transform: translate(2px, 0);    clip-path: inset(10% 0 80% 0); }
  100% { transform: translate(0, 0);      clip-path: inset(0 0 0 0); opacity: 0; }
}
@keyframes glitchB {
  0%   { transform: translate(2px, 0);    clip-path: inset(60% 0 0 0); }
  25%  { transform: translate(-3px, 1px); clip-path: inset(20% 0 40% 0); }
  50%  { transform: translate(3px, -1px); clip-path: inset(5% 0 70% 0); }
  75%  { transform: translate(-2px, 0);   clip-path: inset(80% 0 10% 0); }
  100% { transform: translate(0, 0);      clip-path: inset(0 0 0 0); opacity: 0; }
}

/* tagline */
.tagline {
  font-family: var(--font-term);
  font-size: var(--fs-tagline);
  color: var(--accent);
  margin: 0;
  min-height: 1.5em;
  letter-spacing: .5px;
  text-shadow: var(--glow);
  opacity: .95;
  word-break: break-word;
}
.tagline::after {
  content: "_";
  display: inline-block;
  margin-left: 4px;
  animation: blink 1s steps(2) infinite;
  color: var(--fg);
}

/* contacts */
.contacts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  margin-top: .5rem;
}
.contact {
  font-size: var(--fs-contact);
  color: var(--muted);
  display: inline-flex;
  align-items: baseline;
  gap: .35ch;
  padding: 4px 6px;
  border-radius: var(--radius);
  position: relative;
  transition: color var(--t-fast) var(--ease), text-shadow var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.contact:hover, .contact:focus-visible {
  color: var(--fg);
  text-shadow: var(--glow);
  outline: none;
  transform: translateY(-1px);
}
.contact-prompt {
  color: var(--accent);
  opacity: .9;
}
.contact-name {
  position: relative;
  display: inline-block;
}
.contact-name::before, .contact-name::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  mix-blend-mode: screen;
}
.contact-name::before { color: var(--glitch-r); }
.contact-name::after  { color: var(--glitch-b); }
.contact:hover .contact-name::before,
.contact:focus-visible .contact-name::before {
  opacity: .85;
  animation: glitchA 240ms steps(2) 1;
}
.contact:hover .contact-name::after,
.contact:focus-visible .contact-name::after {
  opacity: .85;
  animation: glitchB 240ms steps(2) 1;
}
.contact.connecting .contact-name {
  color: var(--accent);
  text-shadow: var(--glow);
}
.contact.connecting .contact-name::before,
.contact.connecting .contact-name::after { opacity: 0; }

/* hero foot */
.hero-foot {
  margin-top: 1.5rem;
  font-size: var(--fs-tb);
  color: var(--muted);
  opacity: .65;
  letter-spacing: .5px;
}
.foot-hint kbd { margin: 0 2px; }
#matrix {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 400ms var(--ease);
}
#matrix.on { opacity: 0.35; }
#trail {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
  mix-blend-mode: screen;
}
body.cursor-custom,
body.cursor-custom a,
body.cursor-custom button,
body.cursor-custom input,
body.cursor-custom .nick,
body.cursor-custom .contact,
body.cursor-custom .tb,
body.cursor-custom .tab,
body.cursor-custom .game-btn,
body.cursor-custom .overlay-close,
body.cursor-custom .lb-del,
body.cursor-custom .btn-edit,
body.cursor-custom .btn-del { cursor: none; }

#cursor-dot {
  position: fixed;
  top: 0; left: 0;
  width: 14px;
  height: 14px;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  mix-blend-mode: screen;
  transition: width 120ms var(--ease), height 120ms var(--ease);
  opacity: 0;
}
#cursor-dot::before, #cursor-dot::after {
  content: "";
  position: absolute;
  background: var(--fg);
  box-shadow: var(--glow);
}
#cursor-dot::before {
  /* horizontal line — exactly centered */
  top: 50%; left: 0;
  width: 100%; height: 1px;
  transform: translateY(-50%);
}
#cursor-dot::after {
  /* vertical line — exactly centered */
  left: 50%; top: 0;
  width: 1px; height: 100%;
  transform: translateX(-50%);
}
#cursor-dot.hover {
  width: 26px;
  height: 26px;
}
.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(var(--bg-rgb), 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5vmin;
  animation: ovIn 240ms var(--ease);
}
.overlay[hidden],
.game-stage[hidden],
.admin-stage[hidden],
.admin-panel[hidden] {
  display: none !important;
}
@keyframes ovIn { from { opacity: 0; } to { opacity: 1; } }
.overlay-inner {
  position: relative;
  background: var(--bg);
  border: 1px solid rgba(var(--rgb-r), var(--rgb-g), var(--rgb-b), .35);
  border-radius: var(--radius);
  box-shadow:
    0 0 0 1px rgba(0,0,0,.5),
    0 0 40px rgba(var(--rgb-r), var(--rgb-g), var(--rgb-b), .08),
    0 20px 60px rgba(0,0,0,.5);
  padding: clamp(16px, 4vw, 36px);
  width: min(720px, 100%);
  max-height: 90vh;
  overflow: auto;
}
.overlay-close {
  position: absolute;
  top: 10px;
  right: 12px;
  color: var(--muted);
  font-size: var(--fs-tb);
  opacity: .7;
  transition: opacity var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.overlay-close:hover { opacity: 1; color: var(--alert); }

/* game */
.game-inner { width: min(820px, 100%); }
.game-stage {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: stretch;
}
.game-title {
  font-family: var(--font-term);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  color: var(--fg);
  text-shadow: var(--glow);
  letter-spacing: .02em;
  text-align: center;
  margin-bottom: 8px;
  line-height: 1.1;
}
.game-sub, .admin-sub, .panel-hint {
  color: var(--muted);
  font-size: .9rem;
  text-align: center;
  line-height: 1.5;
}
.game-mini-hint {
  color: var(--muted);
  font-size: .75rem;
  text-align: center;
  opacity: .7;
}
.game-input {
  width: 100%;
  background: var(--bg2);
  border: 1px solid rgba(var(--rgb-r2), var(--rgb-g2), var(--rgb-b2), .4);
  color: var(--fg);
  padding: 10px 12px;
  font-size: 1rem;
  border-radius: var(--radius);
  outline: none;
  caret-color: var(--fg);
  transition: border-color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}
.game-input:focus {
  border-color: var(--fg);
  box-shadow: var(--glow);
}
.game-btn {
  align-self: center;
  padding: 8px 18px;
  border: 1px solid var(--accent);
  color: var(--fg);
  border-radius: var(--radius);
  background: var(--bg2);
  font-size: .95rem;
  letter-spacing: .3px;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.game-btn:hover, .game-btn:focus-visible {
  background: var(--fg);
  color: var(--bg);
  box-shadow: var(--glow);
  outline: none;
}
.game-btn:active { transform: translateY(1px); }
.game-btn.small { padding: 4px 10px; font-size: .8rem; }
.game-btn.danger { border-color: var(--alert); color: var(--alert); }
.game-btn.danger:hover, .game-btn.danger:focus-visible { background: var(--alert); color: var(--bg); box-shadow: 0 0 12px rgba(255,51,85,.5); }

.game-hud {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: .9rem;
  color: var(--muted);
  padding: 6px 4px;
  border-bottom: 1px dashed rgba(var(--rgb-r2), var(--rgb-g2), var(--rgb-b2), .3);
}
.game-hud b { color: var(--fg); text-shadow: var(--glow); }
.game-field {
  position: relative;
  height: 50vh;
  min-height: 280px;
  border: 1px solid rgba(var(--rgb-r2), var(--rgb-g2), var(--rgb-b2), .3);
  border-radius: var(--radius);
  background:
    linear-gradient(rgba(var(--bg-rgb), .4), rgba(var(--bg-rgb), .4)),
    repeating-linear-gradient(0deg, transparent 0, transparent 3px, rgba(var(--rgb-r),var(--rgb-g),var(--rgb-b),.025) 3px, rgba(var(--rgb-r),var(--rgb-g),var(--rgb-b),.025) 4px);
  overflow: hidden;
}
.fall-word {
  position: absolute;
  white-space: nowrap;
  font-size: 1.1rem;
  color: var(--fg);
  text-shadow: var(--glow);
  user-select: none;
  padding: 2px 6px;
  border-radius: var(--radius);
  transition: color 80ms linear, transform 80ms linear, opacity 80ms linear;
  will-change: transform, top;
}
.fall-word.match {
  color: var(--accent);
  text-shadow: var(--glow-strong);
  transform: scale(1.08);
}
.fall-word.boom {
  animation: boom 280ms var(--ease) forwards;
}
@keyframes boom {
  0%   { opacity: 1; transform: scale(1); }
  40%  { opacity: 1; transform: scale(1.6); filter: blur(1px); }
  100% { opacity: 0; transform: scale(2.4); filter: blur(4px); }
}
.game-type-input { margin-top: 8px; }

.game-result-line {
  text-align: center;
  color: var(--muted);
  font-size: 1rem;
}
.game-result-line b { color: var(--fg); text-shadow: var(--glow); }
.game-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* leaderboard */
.leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 50vh;
  overflow: auto;
}
.lb-row {
  display: grid;
  grid-template-columns: 30px 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 6px 8px;
  border-bottom: 1px solid rgba(var(--rgb-r), var(--rgb-g), var(--rgb-b), .1);
  font-size: .9rem;
}
.lb-row .lb-rank { color: var(--muted); }
.lb-row .lb-name { color: var(--fg); word-break: break-all; }
.lb-row .lb-score { color: var(--accent); text-shadow: var(--glow); }
.lb-row .lb-del {
  color: var(--muted);
  font-size: .8rem;
  padding: 2px 6px;
  border-radius: var(--radius);
  transition: color var(--t-fast) var(--ease);
}
.lb-row .lb-del:hover { color: var(--alert); }
.lb-empty { color: var(--muted); text-align: center; padding: 12px; font-size: .9rem; }

/* admin */
.admin-inner { width: min(820px, 100%); }
.admin-stage { display: flex; flex-direction: column; gap: 14px; }
.admin-title {
  font-family: var(--font-term);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  color: var(--fg);
  text-shadow: var(--glow);
  text-align: center;
  letter-spacing: .02em;
  line-height: 1.1;
}
.admin-err { color: var(--alert); text-align: center; font-size: .9rem; }
.admin-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid rgba(var(--rgb-r2), var(--rgb-g2), var(--rgb-b2), .3);
  padding-bottom: 6px;
}
.tab {
  padding: 6px 10px;
  color: var(--muted);
  font-size: .85rem;
  border-radius: var(--radius);
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.tab:hover { color: var(--fg); }
.tab.active {
  color: var(--bg);
  background: var(--fg);
}
.admin-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.edit-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 36vh;
  overflow: auto;
}
.edit-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 6px;
  align-items: center;
  padding: 6px 8px;
  background: var(--bg2);
  border-radius: var(--radius);
  font-size: .9rem;
}
.edit-item input {
  background: transparent;
  border: 0;
  color: var(--fg);
  outline: none;
  width: 100%;
}
.edit-item .btn-del, .edit-item .btn-edit {
  font-size: .8rem;
  padding: 2px 6px;
  color: var(--muted);
  border-radius: var(--radius);
  transition: color var(--t-fast) var(--ease);
}
.edit-item .btn-del:hover { color: var(--alert); }
.edit-item .btn-edit:hover { color: var(--accent); }
.add-row {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 8px;
}
.add-row .game-input { flex: 1; min-width: 200px; }
.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.field span { color: var(--muted); font-size: .8rem; }
.logs-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.logs-count {
  color: var(--muted);
  font-size: .8rem;
  margin-left: auto;
}
.logs-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 50vh;
  overflow: auto;
  font-size: .82rem;
}
.log-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  padding: 4px 6px;
  border-bottom: 1px solid rgba(var(--rgb-r), var(--rgb-g), var(--rgb-b), .08);
  color: var(--muted);
  word-break: break-word;
}
.log-time {
  color: var(--accent);
  white-space: nowrap;
  font-size: .78rem;
}
.log-meta {
  color: var(--fg);
  opacity: .85;
}
.log-meta .log-ip { color: var(--muted); }
.log-meta .log-ua { color: var(--muted); font-size: .75rem; display: block; margin-top: 2px; }
.log-empty { color: var(--muted); text-align: center; padding: 12px; font-size: .9rem; }
@media (max-width: 768px) {
  .hero { padding: 80px 5vmin 40px; }
  .contacts { gap: .5rem 1rem; }
  .contact { font-size: 1.05rem; padding: 6px 8px; }
  .tb { padding: 6px 10px; font-size: .9rem; }
  .game-field { height: 45vh; min-height: 240px; }
  .fall-word { font-size: 1rem; }
  #trail { display: none; }
}

@media (max-width: 480px) {
  .brand { display: none; }
  .topbar { padding: 10px 12px; }
  .topbar-right { gap: 4px; width: 100%; justify-content: space-between; }
  .tb { font-size: .85rem; padding: 6px 8px; }
  .hero-foot { font-size: .75rem; }
  .lb-row { grid-template-columns: 24px 1fr auto; }
  .lb-row .lb-del { display: none; }
  .edit-item { grid-template-columns: 1fr auto; }
  .edit-item .btn-edit { display: none; }
}

@media (pointer: coarse) {
  #trail { display: none; }
  #matrix { display: none; }
  .nick { user-select: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  #trail { display: none; }
}
:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}
.game-input.error {
  border-color: var(--alert) !important;
  animation: shake 220ms var(--ease);
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-4px); }
  40% { transform: translateX(4px); }
  60% { transform: translateX(-3px); }
  80% { transform: translateX(3px); }
}