:root {
  --bg: #10162f;
  --bg-2: #161d3f;
  --primary: #6c5ce7;
  --accent: #00d9ff;
  --success: #20d878;
  --danger: #ff4d67;
  --gold: #ffd166;
  --text: #eef0fb;
  --text-dim: #a7aed6;
  --card: rgba(255, 255, 255, 0.06);
  --card-border: rgba(255, 255, 255, 0.12);
  --radius: 18px;
  --font: 'Poppins', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(ellipse at top, rgba(108, 92, 231, 0.25), transparent 60%),
    radial-gradient(ellipse at bottom, rgba(0, 217, 255, 0.12), transparent 55%),
    var(--bg);
}

a { color: var(--accent); }

[hidden] { display: none !important; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
  position: relative;
  z-index: 1;
}

/* ---------- floating background letters ---------- */
#bg-letters {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}
.float-letter {
  position: absolute;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.045);
  font-size: 48px;
  animation: floatUp linear infinite;
  will-change: transform;
}
@keyframes floatUp {
  from { transform: translateY(110vh) rotate(0deg); }
  to { transform: translateY(-20vh) rotate(20deg); }
}

/* ---------- topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0 6px;
}
.brand {
  font-weight: 800;
  letter-spacing: 0.5px;
  font-size: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand .dot { color: var(--accent); }
.topbar-actions { display: flex; gap: 8px; }
.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: background 0.15s, transform 0.1s;
}
.icon-btn:hover { background: rgba(255,255,255,0.12); }
.icon-btn:active { transform: scale(0.94); }
.icon-btn.active { color: var(--accent); border-color: var(--accent); }

/* ---------- screens ---------- */
.screen {
  padding: 12px 0 40px;
}

/* ---------- home ---------- */
.hero {
  text-align: center;
  padding: 28px 0 8px;
}
.hero h1 {
  font-size: clamp(28px, 8vw, 44px);
  margin: 6px 0 4px;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 1px;
}
.hero .tagline {
  color: var(--text-dim);
  margin: 0 0 20px;
  font-size: 15px;
}
.best-score-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 8px 18px;
  margin-bottom: 22px;
  font-size: 14px;
  color: var(--text-dim);
}
.best-score-pill strong { color: var(--gold); font-size: 16px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 16px;
  padding: 16px 40px;
  font-weight: 700;
  font-size: 18px;
  transition: transform 0.12s, box-shadow 0.12s;
  min-height: 56px;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  box-shadow: 0 10px 30px -8px rgba(108, 92, 231, 0.6);
}
.btn-secondary {
  background: var(--card);
  border: 1px solid var(--card-border);
  color: var(--text);
}
.btn-block { width: 100%; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }

.mini-howto {
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 14px;
  cursor: pointer;
  text-decoration: underline dotted;
}

/* ---------- gameplay ---------- */
.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.hud-stat { text-align: center; min-width: 70px; }
.hud-stat .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
}
.hud-stat .value { font-size: 22px; font-weight: 800; }
.hud-progress {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 6px;
}
#combo-value { color: var(--gold); }
#combo-value.fever { color: var(--danger); }

.timer-track {
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
  margin-bottom: 22px;
}
.timer-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--success), var(--gold));
  transform-origin: left;
  transition: transform 0.08s linear, background 0.2s;
}
.timer-fill.low { background: linear-gradient(90deg, var(--gold), var(--danger)); }

.game-stage {
  position: relative;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 34px 18px 26px;
  text-align: center;
  overflow: hidden;
}
#fx-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.masked-word {
  font-size: clamp(32px, 10vw, 54px);
  font-weight: 800;
  letter-spacing: 10px;
  margin: 4px 0 30px;
  word-break: break-all;
}
.masked-word .blank {
  display: inline-block;
  width: 0.85em;
  border-bottom: 4px solid var(--accent);
  margin: 0 2px;
}

.choices-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  max-width: 340px;
  margin: 0 auto;
}
.choice-btn {
  background: rgba(255,255,255,0.08);
  border: 2px solid var(--card-border);
  border-radius: 16px;
  min-height: 68px;
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.1s, background 0.15s, border-color 0.15s;
}
.choice-btn:hover { background: rgba(255,255,255,0.14); }
.choice-btn:active { transform: scale(0.95); }
.choice-btn.correct {
  background: rgba(32, 216, 120, 0.25);
  border-color: var(--success);
  color: var(--success);
}
.choice-btn.wrong {
  background: rgba(255, 77, 103, 0.25);
  border-color: var(--danger);
  color: var(--danger);
  animation: shake 0.3s;
}
.choice-btn[disabled] { pointer-events: none; opacity: 0.85; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

.feedback-banner {
  position: absolute;
  top: 10px; left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: rgba(0,0,0,0.35);
  border-radius: 999px;
  padding: 6px 18px;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 1px;
  opacity: 0;
  transition: opacity 0.15s, transform 0.15s;
  white-space: nowrap;
}
.feedback-banner.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.feedback-banner.perfect { color: var(--gold); }
.feedback-banner.combo { color: var(--accent); }
.feedback-banner.fever { color: var(--danger); }

.score-popup {
  position: absolute;
  font-weight: 800;
  font-size: 20px;
  color: var(--success);
  pointer-events: none;
  animation: popUp 0.7s ease-out forwards;
}
@keyframes popUp {
  0% { opacity: 0; transform: translateY(0) scale(0.8); }
  20% { opacity: 1; transform: translateY(-10px) scale(1.05); }
  100% { opacity: 0; transform: translateY(-46px) scale(1); }
}

/* ---------- game over ---------- */
.result-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 26px 20px;
  text-align: center;
}
.result-card h2 { margin: 0 0 4px; font-size: 26px; }
.result-retention {
  color: var(--gold);
  font-weight: 700;
  margin: 4px 0 18px;
}
.result-score {
  font-size: 52px;
  font-weight: 900;
  background: linear-gradient(90deg, var(--gold), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
  margin-bottom: 18px;
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}
.stat-box {
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  padding: 10px 4px;
}
.stat-box .label { font-size: 11px; color: var(--text-dim); text-transform: uppercase; }
.stat-box .value { font-size: 20px; font-weight: 800; margin-top: 2px; }

.nickname-form {
  display: flex;
  gap: 8px;
  margin: 4px 0 18px;
  flex-wrap: wrap;
  justify-content: center;
}
.nickname-form input {
  flex: 1;
  min-width: 160px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 14px 16px;
  color: var(--text);
  font-size: 15px;
}
.nickname-form input:focus { outline: 2px solid var(--accent); }
.nickname-hint { font-size: 12px; color: var(--text-dim); margin-top: -10px; margin-bottom: 16px; }

.social-compete {
  background: rgba(255,255,255,0.04);
  border-radius: 12px;
  padding: 12px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 18px;
}
.social-compete strong { color: var(--text); }

/* ---------- modals ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(6, 8, 20, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 16px;
}
.modal {
  background: var(--bg-2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  max-width: 480px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 22px;
}
.modal h2 { margin-top: 0; }
.modal-close {
  float: right;
  font-size: 22px;
  color: var(--text-dim);
}
.tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tab-btn {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  font-weight: 700;
  font-size: 13px;
}
.tab-btn.active { background: var(--primary); color: #fff; }
.lb-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 6px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 14px;
}
.lb-row .rank { width: 28px; font-weight: 800; color: var(--text-dim); }
.lb-row .name { flex: 1; font-weight: 600; }
.lb-row .score { font-weight: 800; color: var(--gold); }
.lb-row.me { background: rgba(108,92,231,0.18); border-radius: 10px; }
.lb-empty { text-align: center; color: var(--text-dim); padding: 20px 0; }

.howto-step {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 12px;
}
.howto-step .num {
  background: var(--primary);
  color: #fff;
  width: 26px; height: 26px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 13px;
  flex-shrink: 0;
}

/* ---------- countdown overlay ---------- */
#countdown-overlay {
  position: fixed;
  inset: 0;
  background: rgba(16, 22, 47, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 40;
}
#countdown-number {
  font-size: 120px;
  font-weight: 900;
  color: var(--accent);
  text-shadow: 0 0 40px rgba(0,217,255,0.6);
}

/* ---------- SEO content ---------- */
.seo-content {
  margin-top: 40px;
  color: var(--text-dim);
  font-size: 14.5px;
  line-height: 1.7;
}
.seo-content h2 {
  color: var(--text);
  font-size: 20px;
  margin-top: 32px;
}
.seo-content h3 { color: var(--text); font-size: 16px; }
.faq-item { margin-bottom: 14px; }
.faq-item dt { color: var(--text); font-weight: 700; margin-bottom: 4px; }

.related-games {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  margin: 16px 0 8px;
}
.related-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 16px 10px;
  text-align: center;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 14px;
  transition: transform 0.1s, background 0.15s;
}
.related-card:hover { background: rgba(255,255,255,0.12); transform: translateY(-2px); }
.related-card .emoji { font-size: 26px; display: block; margin-bottom: 6px; }

.ad-slot {
  min-height: 90px;
  border-radius: 12px;
  border: 1px dashed var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 12px;
  margin: 20px 0;
}

.site-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 12.5px;
  padding: 28px 0 40px;
}
.site-footer a { color: var(--text-dim); margin: 0 8px; text-decoration: none; }
.site-footer a:hover { color: var(--accent); }

.error-toast {
  position: fixed;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--danger);
  color: #fff;
  padding: 10px 20px;
  border-radius: 12px;
  font-size: 13px;
  z-index: 60;
  max-width: 90vw;
}

@media (prefers-reduced-motion: reduce) {
  .float-letter { animation: none; display: none; }
  .choice-btn.wrong { animation: none; }
  .score-popup { animation: none; opacity: 0.9; }
}

@media (max-width: 480px) {
  .btn { padding: 15px 28px; font-size: 16px; }
  .choices-grid { max-width: 300px; gap: 10px; }
  .choice-btn { font-size: 24px; min-height: 60px; }
  .result-score { font-size: 42px; }
}