/* Stack Tower — ui.css: menu, modals, buttons */

.screen {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
}
.screen[hidden] { display: none; }

/* ---------- Menu ---------- */
#screen-menu {
  background: transparent;
  flex-direction: column;
}
.menu-inner {
  width: 100%;
  max-width: 360px;
  padding: 24px 28px calc(28px + var(--safe-bottom));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.logo {
  text-align: center;
  line-height: 1;
  margin-top: 4px;
}
.logo-line1, .logo-line2 {
  display: block;
  font-size: 44px;
  font-weight: 900;
  letter-spacing: 6px;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple) 60%, var(--neon-pink));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 18px rgba(176, 107, 255, 0.45));
}

.tagline {
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
  text-align: center;
}

.menu-best {
  display: flex;
  gap: 22px;
  margin-bottom: 4px;
}
.menu-best-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.menu-best-label {
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  font-weight: 600;
}
.menu-best-value {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-light);
  text-shadow: 0 0 10px rgba(77, 216, 255, 0.4);
}

.menu-nickname {
  width: 100%;
  display: block;
}
#input-nickname {
  width: 100%;
  padding: 13px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-light);
  font-size: 15px;
  text-align: center;
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}
#input-nickname::placeholder { color: var(--text-dim); }
#input-nickname:focus {
  border-color: var(--neon-blue);
  background: rgba(77, 216, 255, 0.08);
}
.nickname-error {
  color: var(--neon-pink);
  font-size: 12px;
  margin-top: -8px;
  text-align: center;
}
.nickname-error[hidden] { display: none; }

.btn-primary {
  width: 100%;
  padding: 16px;
  border-radius: 999px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: #06040f;
  background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
  box-shadow: 0 8px 24px rgba(176, 107, 255, 0.35), 0 0 0 1px rgba(255,255,255,0.08) inset;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled { opacity: 0.5; pointer-events: none; }

.menu-row {
  display: flex;
  gap: 10px;
  width: 100%;
}
.menu-row-icons {
  justify-content: center;
  gap: 14px;
  margin-top: 2px;
}

.btn-secondary {
  flex: 1;
  padding: 12px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--text-light);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  transition: transform 0.12s ease, background 0.12s ease;
}
.btn-secondary:active { transform: scale(0.96); }

/* ---------- Modal screens ---------- */
.modal-screen {
  background: rgba(3, 2, 10, 0.72);
  backdrop-filter: blur(4px);
  padding: 16px;
}

.modal-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  background: linear-gradient(165deg, rgba(26, 15, 51, 0.95), rgba(11, 10, 31, 0.97));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 22px;
  padding: 28px 24px calc(24px + var(--safe-bottom));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.modal-card h2 {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 2px;
  color: var(--text-light);
  text-align: center;
}

.btn-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.08);
  color: var(--text-dim);
  font-size: 14px;
}

/* Countdown */
#screen-countdown {
  background: rgba(3, 2, 10, 0.4);
  pointer-events: none;
}
.countdown-number {
  font-size: 96px;
  font-weight: 900;
  color: #fff;
  text-shadow: 0 0 40px var(--neon-blue);
  animation: countdown-pulse 1s ease;
}
@keyframes countdown-pulse {
  0% { transform: scale(1.6); opacity: 0; }
  40% { transform: scale(1); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0; }
}

/* Game over */
.new-high-score {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--neon-orange);
  text-shadow: 0 0 12px var(--neon-orange);
}
.new-high-score[hidden] { display: none; }

.gameover-stats {
  display: flex;
  width: 100%;
  justify-content: space-between;
  gap: 10px;
  margin: 4px 0;
}
.stat-block {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 6px;
  border-radius: 14px;
  background: rgba(255,255,255,0.05);
}
.stat-label {
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  font-weight: 700;
}
.stat-value {
  font-size: 20px;
  font-weight: 900;
  color: var(--text-light);
  margin-top: 3px;
}

.gameover-submit-status {
  font-size: 12px;
  color: var(--text-dim);
  min-height: 16px;
  text-align: center;
}

/* Leaderboard */
.leaderboard-card { max-width: 420px; }
.leaderboard-list {
  width: 100%;
  max-height: 46vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.leaderboard-loading, .leaderboard-empty, .leaderboard-error {
  color: var(--text-dim);
  font-size: 13px;
  text-align: center;
  padding: 20px 0;
}
.lb-row {
  display: grid;
  grid-template-columns: 32px 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 9px 12px;
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  font-size: 13px;
}
.lb-row.lb-top3 { background: rgba(176, 107, 255, 0.14); }
.lb-row.lb-self { outline: 1px solid var(--neon-blue); background: rgba(77,216,255,0.1); }
.lb-rank { font-weight: 800; color: var(--text-dim); }
.lb-row.lb-top3 .lb-rank { color: var(--neon-orange); }
.lb-name { color: var(--text-light); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lb-score { font-weight: 800; color: var(--text-light); text-align: right; }
.lb-height { color: var(--text-dim); text-align: right; font-size: 11px; }

.leaderboard-player-rank {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(255, 171, 77, 0.12);
  border: 1px dashed rgba(255, 171, 77, 0.4);
  text-align: center;
  font-size: 12px;
  color: var(--neon-orange);
}
.leaderboard-player-rank[hidden] { display: none; }

/* How to play */
.howto-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.howto-list li {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text-light);
  padding-left: 18px;
  position: relative;
}
.howto-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--neon-blue);
}

/* Settings */
.settings-row {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px;
  font-size: 14px;
  color: var(--text-light);
}
.toggle-btn {
  width: 46px;
  height: 26px;
  border-radius: 999px;
  background: rgba(255,255,255,0.15);
  position: relative;
  transition: background 0.15s ease;
}
.toggle-btn::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  transition: transform 0.15s ease;
}
.toggle-btn.on { background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple)); }
.toggle-btn.on::after { transform: translateX(20px); }

/* ---------- SEO content (below fold, not part of game viewport) ---------- */
#seo-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 60px;
  color: var(--text-dim);
  background: var(--bg-black);
  display: none;
}
#seo-content h2 {
  color: var(--text-light);
  font-size: 18px;
  margin-bottom: 8px;
  margin-top: 24px;
}
#seo-content h2:first-child { margin-top: 0; }
#seo-content p { font-size: 14px; line-height: 1.6; }

@media (min-width: 700px) {
  .modal-card { padding: 34px 32px calc(30px + var(--safe-bottom)); }
}