/* NUMBER RUSH — Neon Brain Arcade visual theme. Game CMB (gamecmb.com) */

:root {
  --bg: #080b14;
  --bg-2: #0d1224;
  --neon-cyan: #00f0ff;
  --neon-magenta: #ff2e93;
  --neon-amber: #ffd23f;
  --neon-green: #35ffb0;
  --text: #eef2ff;
  --text-dim: #97a3c9;
  --glass-bg: rgba(255, 255, 255, 0.055);
  --glass-border: rgba(255, 255, 255, 0.14);
  --danger: #ff4d6d;
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Rubik', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  overflow-x: hidden;
}

body {
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0, 240, 255, 0.14), transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 100%, rgba(255, 46, 147, 0.12), transparent 60%),
    var(--bg);
  min-height: 100vh;
}

a {
  color: var(--neon-cyan);
}

.container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ---------- top bar ---------- */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  max-width: 880px;
  margin: 0 auto;
}
.top-bar .brand {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.top-bar .brand-name {
  font-weight: 800;
  letter-spacing: 0.06em;
  font-size: 15px;
}
.top-bar .brand-sub {
  font-size: 11px;
  color: var(--text-dim);
}
.top-bar .top-actions {
  display: flex;
  gap: 8px;
}

/* ---------- game stage ---------- */
#gameStage {
  position: relative;
  width: 100%;
  max-width: 480px;
  aspect-ratio: 9 / 16;
  max-height: 82vh;
  margin: 8px auto 0;
  border-radius: 24px;
  overflow: hidden;
  background: linear-gradient(180deg, var(--bg-2), var(--bg));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), inset 0 0 80px rgba(0, 240, 255, 0.04);
}

@media (min-width: 720px) {
  #gameStage {
    max-width: 420px;
  }
}

#fxCanvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 30;
}

#flashOverlay {
  position: absolute;
  inset: 0;
  background: var(--danger);
  opacity: 0;
  pointer-events: none;
  z-index: 25;
}
#flashOverlay.flash-active {
  animation: flashPulse 260ms ease-out;
}
@keyframes flashPulse {
  0% {
    opacity: 0.35;
  }
  100% {
    opacity: 0;
  }
}

#gameStage.shake {
  animation: shakeKf 260ms ease-in-out;
}
@keyframes shakeKf {
  0%,
  100% {
    transform: translateX(0);
  }
  20% {
    transform: translateX(-8px);
  }
  40% {
    transform: translateX(7px);
  }
  60% {
    transform: translateX(-5px);
  }
  80% {
    transform: translateX(4px);
  }
}

#gameStage.rush-active {
  box-shadow: 0 20px 60px rgba(255, 210, 63, 0.25), inset 0 0 100px rgba(255, 210, 63, 0.1);
  animation: rushPulseBg 1.1s ease-in-out infinite;
}
@keyframes rushPulseBg {
  0%,
  100% {
    background: linear-gradient(180deg, #241a08, var(--bg));
  }
  50% {
    background: linear-gradient(180deg, #2e2008, var(--bg));
  }
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
}

.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius);
}

/* ---------- menu screen ---------- */
.menu-panel {
  width: 100%;
  padding: 32px 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.brand-title {
  font-size: clamp(30px, 8vw, 42px);
  font-weight: 900;
  letter-spacing: 0.05em;
  margin: 6px 0 0;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 30px rgba(0, 240, 255, 0.25);
}
.brand-tagline {
  color: var(--text-dim);
  font-size: 14px;
  margin: 0 0 14px;
  letter-spacing: 0.03em;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 14px;
  padding: 15px 28px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  width: 100%;
  max-width: 280px;
  min-height: 48px;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  font-family: inherit;
}
.btn:active {
  transform: scale(0.97);
}
.btn-primary {
  background: linear-gradient(90deg, var(--neon-cyan), #6de9ff);
  color: #041018;
  box-shadow: 0 8px 24px rgba(0, 240, 255, 0.35);
}
.btn-secondary {
  background: linear-gradient(90deg, var(--neon-magenta), #ff7fc0);
  color: #200013;
  box-shadow: 0 8px 24px rgba(255, 46, 147, 0.3);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid var(--glass-border);
}

.menu-icons {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}
.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
}

.best-score-line {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--text-dim);
}

/* ---------- countdown ---------- */
.countdown-num {
  font-size: 120px;
  font-weight: 900;
  color: var(--neon-cyan);
  text-shadow: 0 0 40px rgba(0, 240, 255, 0.6);
  animation: countPop 0.7s ease;
}
@keyframes countPop {
  0% {
    transform: scale(0.4);
    opacity: 0;
  }
  40% {
    transform: scale(1.15);
    opacity: 1;
  }
  100% {
    transform: scale(1);
  }
}

/* ---------- play screen ---------- */
#screen-play {
  justify-content: flex-start;
  padding: 14px 14px 18px;
  gap: 8px;
}

.hud-top {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  z-index: 5;
}
.hud-lives {
  font-size: 15px;
  filter: drop-shadow(0 0 6px rgba(255, 77, 109, 0.5));
}
.hud-score {
  font-size: 22px;
  font-weight: 900;
  color: var(--neon-cyan);
  text-shadow: 0 0 14px rgba(0, 240, 255, 0.4);
}
.hud-level {
  font-size: 13px;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.06);
  padding: 4px 10px;
  border-radius: 10px;
}

.rush-meter-wrap {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 5;
}
.rush-meter-label {
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--neon-amber);
  font-weight: 800;
}
.rush-meter-track {
  flex: 1;
  height: 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
}
.rush-meter-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--neon-amber), #ff9d1f);
  box-shadow: 0 0 12px rgba(255, 210, 63, 0.7);
  transition: width 0.25s ease;
}

.event-banner {
  z-index: 5;
  font-weight: 800;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  animation: bannerIn 0.3s ease;
}
.event-double {
  color: var(--neon-magenta);
}
.event-lightning {
  color: var(--neon-amber);
}
.event-reverse {
  color: var(--neon-green);
}
.event-target {
  color: var(--neon-cyan);
}
.event-bomb {
  color: var(--danger);
}
@keyframes bannerIn {
  from {
    transform: translateY(-6px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.question-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 0;
  z-index: 5;
  position: relative;
}
.question-wrap::before {
  content: '';
  position: absolute;
  width: min(70vw, 320px);
  height: min(70vw, 320px);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.14), rgba(255, 46, 147, 0.06) 55%, transparent 72%);
  filter: blur(2px);
  animation: questionGlowPulse 3.2s ease-in-out infinite;
  z-index: -1;
}
@keyframes questionGlowPulse {
  0%,
  100% {
    transform: scale(0.94);
    opacity: 0.75;
  }
  50% {
    transform: scale(1.04);
    opacity: 1;
  }
}
#screen-play {
  background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: center;
}
.question-display {
  font-size: clamp(30px, 9vw, 44px);
  font-weight: 900;
  letter-spacing: 0.02em;
  text-shadow: 0 0 26px rgba(0, 240, 255, 0.3);
}
.question-display.pop-in {
  animation: qPop 0.28s ease;
}
@keyframes qPop {
  0% {
    transform: scale(0.85);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}
.target-label {
  font-size: 13px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  font-weight: 800;
}
.target-number {
  font-size: clamp(48px, 14vw, 64px);
  color: var(--neon-amber);
  text-shadow: 0 0 30px rgba(255, 210, 63, 0.5);
}
.target-nums {
  font-size: 20px;
  color: var(--text-dim);
  margin-top: 6px;
}

.timer-track {
  width: 100%;
  height: 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  z-index: 5;
}
.timer-fill {
  height: 100%;
  width: 100%;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta));
}

.combo-badge {
  z-index: 5;
  font-weight: 900;
  font-size: 13px;
  color: var(--neon-magenta);
  text-shadow: 0 0 12px rgba(255, 46, 147, 0.6);
}

.answers-grid {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  z-index: 5;
}
.answer-btn {
  min-height: 58px;
  border-radius: 16px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  color: var(--text);
  font-size: clamp(18px, 5.5vw, 24px);
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease;
}
.answer-btn:active:not(:disabled) {
  transform: scale(0.96);
}
.answer-btn:disabled {
  cursor: default;
}
.answer-btn.correct {
  background: rgba(53, 255, 176, 0.25);
  border-color: var(--neon-green);
  box-shadow: 0 0 22px rgba(53, 255, 176, 0.35);
}
.answer-btn.wrong {
  background: rgba(255, 77, 109, 0.22);
  border-color: var(--danger);
}
.answer-btn.bomb-marked {
  border-color: var(--danger);
  color: #ffd7dd;
}
.answer-btn.bomb-hit {
  background: rgba(255, 77, 109, 0.4);
  border-color: var(--danger);
}

.score-float {
  position: absolute;
  left: 50%;
  top: 40%;
  transform: translate(-50%, 0);
  font-weight: 900;
  font-size: 22px;
  opacity: 0;
  z-index: 40;
  pointer-events: none;
}
.score-float.positive {
  color: var(--neon-green);
}
.score-float.negative {
  color: var(--danger);
}
.score-float-anim {
  animation: floatUp 0.85s ease-out forwards;
}
@keyframes floatUp {
  0% {
    opacity: 0;
    transform: translate(-50%, 10px) scale(0.8);
  }
  25% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -60px) scale(1.1);
  }
}

/* ---------- game over ---------- */
.panel {
  width: 100%;
  padding: 28px 22px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
#goTitle {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.04em;
}
.go-score {
  font-size: 46px;
  font-weight: 900;
  color: var(--neon-cyan);
  text-shadow: 0 0 26px rgba(0, 240, 255, 0.4);
}
.go-best {
  color: var(--text-dim);
  font-size: 13px;
}
.go-stats {
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.go-retention {
  font-size: 13px;
  color: var(--neon-amber);
  margin: 4px 0 10px;
  max-width: 280px;
}

.nickname-row {
  width: 100%;
  max-width: 280px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.nickname-row input {
  width: 100%;
  padding: 13px 14px;
  border-radius: 12px;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 15px;
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.nickname-row input::placeholder {
  color: var(--text-dim);
}
.nickname-error {
  color: var(--danger);
  font-size: 11.5px;
}

/* ---------- modals ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(3, 5, 12, 0.72);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}
.modal-panel {
  width: 100%;
  max-width: 420px;
  max-height: 82vh;
  overflow-y: auto;
  padding: 22px;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  cursor: pointer;
  font-size: 16px;
}
.modal h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

.lb-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.lb-tab {
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-dim);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 12px;
  cursor: pointer;
  font-weight: 700;
}
.lb-tab.active {
  background: linear-gradient(90deg, var(--neon-cyan), #6de9ff);
  color: #041018;
}
.lb-row {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 8px;
  padding: 9px 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 14px;
}
.lb-rank {
  color: var(--text-dim);
  font-weight: 700;
}
.lb-score {
  font-weight: 800;
  color: var(--neon-cyan);
}
.lb-loading {
  color: var(--text-dim);
  padding: 18px 0;
  text-align: center;
  font-size: 13px;
}

.howto-section h3 {
  font-size: 13px;
  color: var(--neon-cyan);
  margin: 16px 0 6px;
}
.howto-section p,
.howto-section li {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.5;
}
.howto-section ul {
  margin: 0;
  padding-left: 18px;
}

.ach-row {
  padding: 10px 4px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  opacity: 0.55;
}
.ach-row.ach-unlocked {
  opacity: 1;
}
.ach-label {
  font-weight: 800;
  font-size: 14px;
}
.ach-desc {
  font-size: 12px;
  color: var(--text-dim);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  font-size: 14px;
}

/* ---------- toasts ---------- */
#toastContainer {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 200;
  width: 100%;
  align-items: center;
  pointer-events: none;
}
.toast {
  background: rgba(15, 18, 32, 0.95);
  border: 1px solid var(--glass-border);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  max-width: 90vw;
  text-align: center;
}
.toast-show {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- ad slots ---------- */
.ad-slot {
  max-width: 480px;
  margin: 10px auto;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 11px;
  border: 1px dashed rgba(255, 255, 255, 0.12);
  border-radius: 10px;
}

/* ---------- SEO content section ---------- */
.seo-content {
  max-width: 720px;
  margin: 30px auto 60px;
  padding: 0 18px;
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.65;
}
.seo-content h1 {
  color: var(--text);
  font-size: 24px;
  margin-bottom: 4px;
}
.seo-content h2 {
  color: var(--text);
  font-size: 17px;
  margin: 26px 0 8px;
}
.seo-content ul {
  padding-left: 20px;
}
.seo-content .features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 8px 16px;
  list-style: none;
  padding: 0;
}
.seo-content .features-grid li::before {
  content: '✓ ';
  color: var(--neon-green);
  font-weight: 800;
}
.footer-note {
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  padding: 20px;
}

/* ---------- accessibility / reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  #gameStage.shake,
  .question-display.pop-in,
  .score-float-anim,
  .countdown-num {
    animation: none !important;
  }
}

@media (max-width: 380px) {
  .top-bar .brand-sub {
    display: none;
  }
}