:root {
  --panel-bg: rgba(11, 20, 32, 0.94);
  --panel-text: #f2f6ff;
  --panel-muted: #b7c4dc;
  --panel-border: rgba(255, 255, 255, 0.2);
  --panel-accent: #9fd3ff;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #0d1726;
  touch-action: none;
  overscroll-behavior: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

#stage {
  position: fixed;
  inset: 0;
  display: block;
  width: 100vw;
  height: 100vh;
}

/* ── Welcome overlay ── */

#welcome-overlay {
  position: fixed;
  inset: 0;
  z-index: 15;
  padding:
    calc(env(safe-area-inset-top, 0px) + 20px)
    calc(env(safe-area-inset-right, 0px) + 16px)
    calc(env(safe-area-inset-bottom, 0px) + 64px)
    calc(env(safe-area-inset-left, 0px) + 16px);
  overflow-x: hidden;
  overflow-y: auto;
  pointer-events: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

#welcome-overlay[hidden] {
  display: none;
}

.welcome-shell {
  width: min(520px, 100%);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.welcome-card {
  width: 100%;
  padding: 24px 24px 22px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(8, 14, 26, 0.76);
  backdrop-filter: blur(5px);
  box-shadow: 0 12px 38px rgba(0, 0, 0, 0.35);
  color: #f3f7ff;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: auto;
}

.welcome-card h1 {
  margin: 0;
  font-size: clamp(1.45rem, 5.8vw, 2rem);
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-hand {
  font-size: 1.05em;
  animation: title-hand-wave 2.5s ease-in-out infinite;
  display: inline-block;
  transform-origin: 70% 80%;
}

@keyframes title-hand-wave {
  0%, 100% { transform: rotate(0deg); }
  15% { transform: rotate(14deg); }
  30% { transform: rotate(-8deg); }
  45% { transform: rotate(14deg); }
  60% { transform: rotate(-4deg); }
  75% { transform: rotate(10deg); }
}

.welcome-lead,
.welcome-start,
.welcome-help,
.welcome-privacy {
  margin: 0;
  line-height: 1.42;
}

.welcome-lead {
  color: #dde9ff;
}

.welcome-badges {
  margin-top: 2px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.welcome-badges span {
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid rgba(159, 211, 255, 0.35);
  background: rgba(120, 184, 255, 0.12);
  color: #d9eaff;
  font-size: 0.82rem;
  line-height: 1.3;
  transform: translateY(0);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  transition:
    transform 160ms cubic-bezier(0.22, 0.8, 0.24, 1),
    box-shadow 220ms ease,
    border-color 220ms ease,
    background 220ms ease;
}

.welcome-start {
  color: #b8cef2;
  margin-top: 4px;
  font-size: 1.02rem;
}

.welcome-help {
  color: #cfdcf5;
  font-size: 0.92rem;
  margin-top: 4px;
}

.welcome-help code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 5px;
  padding: 1px 4px;
}

#start-play {
  margin-top: 10px;
  font: inherit;
  font-weight: 700;
  color: #f5fbff;
  background: rgba(118, 184, 255, 0.28);
  border: 1px solid rgba(160, 210, 255, 0.62);
  border-radius: 10px;
  padding: 12px 20px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  pointer-events: auto;
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(16, 48, 90, 0.2);
  transition:
    transform 170ms cubic-bezier(0.22, 0.8, 0.24, 1),
    box-shadow 220ms ease,
    border-color 220ms ease,
    background 220ms ease;
}

#start-play::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    115deg,
    rgba(255, 255, 255, 0) 18%,
    rgba(255, 255, 255, 0.28) 46%,
    rgba(255, 255, 255, 0) 72%
  );
  transform: translateX(-140%);
  transition: transform 460ms cubic-bezier(0.22, 0.8, 0.24, 1);
}

#start-play:active {
  transform: translateY(0);
  box-shadow: 0 3px 8px rgba(16, 48, 90, 0.26);
}

@media (hover: hover) and (pointer: fine) {
  .welcome-badges span:hover {
    background: rgba(120, 184, 255, 0.2);
    border-color: rgba(186, 227, 255, 0.74);
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(46, 112, 182, 0.28);
  }

  #start-play:hover {
    background: rgba(118, 184, 255, 0.4);
    border-color: rgba(181, 225, 255, 0.82);
    transform: translateY(-2px);
    box-shadow: 0 11px 24px rgba(40, 103, 170, 0.34);
  }

  #start-play:hover::after {
    transform: translateX(140%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .title-hand {
    animation: none;
    transform: none;
  }

  .welcome-badges span {
    transition: background 140ms ease, border-color 140ms ease;
    transform: none;
    box-shadow: none;
  }

  #start-play {
    transition: background 140ms ease, border-color 140ms ease;
    transform: none;
    box-shadow: 0 4px 10px rgba(16, 48, 90, 0.2);
  }

  #start-play::after {
    display: none;
  }
}

#start-play:focus-visible,
.welcome-links a:focus-visible {
  outline: 2px solid #9fd3ff;
  outline-offset: 2px;
}

.welcome-privacy {
  width: 100%;
  color: #cfdef5;
  text-align: center;
  font-size: 0.8rem;
  line-height: 1.35;
  pointer-events: none;
}

.welcome-privacy p {
  margin: 0;
}

/* ── Parent panel ── */

#parent-panel {
  position: fixed;
  top: calc(env(safe-area-inset-top, 0px) + 12px);
  left: calc(env(safe-area-inset-left, 0px) + 12px);
  z-index: 20;
  width: min(320px, calc(100vw - 24px));
  background: var(--panel-bg);
  color: var(--panel-text);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 12px;
  backdrop-filter: blur(4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

#parent-panel[hidden] {
  display: none;
}

#parent-panel h2 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.panel-emoji {
  display: inline-block;
  margin-right: 6px;
}

.panel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 8px;
  font-size: 0.95rem;
}

#theme-select,
#parent-panel button,
#pin-input {
  font: inherit;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.1);
  color: var(--panel-text);
  padding: 6px 8px;
}

#theme-select {
  min-width: 130px;
}

#pin-input {
  width: 80px;
  text-align: center;
  font-size: 1rem;
  letter-spacing: 0.15em;
}

#parent-panel button {
  cursor: pointer;
}

#parent-panel button:focus-visible,
#theme-select:focus-visible,
#parent-panel input:focus-visible,
#pin-input:focus-visible {
  outline: 2px solid var(--panel-accent);
  outline-offset: 2px;
}

.panel-divider {
  height: 1px;
  background: var(--panel-border);
  margin: 6px 0 10px;
}

.panel-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.panel-hint {
  margin: 10px 0 0;
  color: var(--panel-muted);
  font-size: 0.82rem;
  line-height: 1.3;
}

/* ── PIN overlay ── */

#pin-overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
}

#pin-overlay[hidden] {
  display: none;
}

.pin-dialog {
  width: min(320px, calc(100vw - 32px));
  padding: 24px;
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(8, 14, 26, 0.92);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  color: #f3f7ff;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pin-dialog h3 {
  margin: 0;
  font-size: 1.2rem;
}

#pin-verify {
  font: inherit;
  font-size: 1.6rem;
  letter-spacing: 0.3em;
  text-align: center;
  padding: 12px 16px;
  border-radius: 10px;
  border: 2px solid rgba(159, 211, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  color: #f3f7ff;
  outline: none;
  transition: border-color 200ms ease;
}

#pin-verify:focus {
  border-color: rgba(159, 211, 255, 0.8);
}

.pin-error {
  margin: 0;
  color: #ff6b6b;
  font-size: 0.9rem;
  font-weight: 700;
  animation: pin-shake 400ms ease;
}

@keyframes pin-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

.pin-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.pin-actions button {
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: #f3f7ff;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease;
}

#pin-confirm {
  background: rgba(118, 184, 255, 0.28);
  border-color: rgba(160, 210, 255, 0.62);
}

@media (hover: hover) and (pointer: fine) {
  .pin-actions button:hover {
    background: rgba(143, 208, 255, 0.18);
    border-color: rgba(202, 233, 255, 0.62);
  }

  #pin-confirm:hover {
    background: rgba(118, 184, 255, 0.4);
    border-color: rgba(181, 225, 255, 0.82);
  }
}

.pin-actions button:focus-visible {
  outline: 2px solid #9fd3ff;
  outline-offset: 2px;
}

/* ── Responsive ── */

@media (max-width: 420px) {
  #welcome-overlay {
    padding:
      calc(env(safe-area-inset-top, 0px) + 12px)
      calc(env(safe-area-inset-right, 0px) + 10px)
      calc(env(safe-area-inset-bottom, 0px) + 70px)
      calc(env(safe-area-inset-left, 0px) + 10px);
  }

  .welcome-card {
    padding: 16px 16px 15px;
    gap: 10px;
  }

  .welcome-privacy {
    width: 100%;
    font-size: 0.76rem;
  }

  #parent-panel {
    width: calc(100vw - 16px);
    left: 8px;
    top: calc(env(safe-area-inset-top, 0px) + 8px);
  }
}