:root {
  --bg: #070b16;
  --card: rgba(12, 18, 36, 0.9);
  --line: rgba(255, 255, 255, 0.12);
  --text: #eef2ff;
  --muted: #94a0c2;
  --cyan: #3de7ff;
  --magenta: #ff4fd8;
  --green: #7dffa0;
  --amber: #ffd56a;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bot: env(safe-area-inset-bottom, 0px);
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Ubuntu, sans-serif;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.hidden { display: none !important; }

#versionTag {
  position: absolute;
  top: max(8px, env(safe-area-inset-top, 0px));
  right: 10px;
  z-index: 8;
  font-size: 11px;
  font-weight: 600;
  color: #fff;
  opacity: 0.55;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.65);
  pointer-events: none;
  letter-spacing: 0.4px;
}

#stage {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  line-height: 0;
  touch-action: none;
}

#cv {
  display: block;
  border-radius: 18px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 20px 60px rgba(0, 0, 0, 0.55),
    0 0 80px rgba(125, 255, 160, 0.1);
  cursor: pointer;
  touch-action: none;
  position: relative;
  z-index: 1;
}

.screen {
  position: absolute;
  inset: 0;
  border-radius: 18px;
  overflow: hidden;
  line-height: normal;
  pointer-events: none;
}

.screen[data-screen="menu"],
.screen[data-screen="difficulty"],
.screen[data-screen="adventure"],
.screen[data-screen="freeplay"],
.screen[data-screen="settings"],
.screen[data-screen="win"],
.screen[data-screen="pause"] {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background:
    linear-gradient(180deg, rgba(7, 11, 22, 0.55), rgba(7, 11, 22, 0.82));
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 5;
  pointer-events: auto;
}

.screen.hidden {
  pointer-events: none !important;
}

.play-chrome {
  z-index: 6;
  pointer-events: auto;
}

.menu-card {
  width: min(340px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px 20px 18px;
  text-align: center;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
  max-height: 95%;
  overflow-y: auto;
}

.logo-icon {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  margin-bottom: 8px;
  box-shadow: 0 0 0 1px rgba(125, 255, 160, 0.35), 0 8px 24px rgba(125, 255, 160, 0.2);
}

.menu-card h1 {
  margin: 0 0 4px;
  font-size: 1.65rem;
  letter-spacing: -0.02em;
}
.menu-card h2 {
  margin: 0 0 6px;
  font-size: 1.35rem;
}
.c1 { color: var(--green); }
.c2 { color: var(--amber); }

.tagline {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.win-banner {
  margin: 0 0 4px;
  font-size: 1.1rem;
  color: var(--amber);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 0 0 16px;
}
.stats.tall { grid-template-columns: repeat(3, 1fr); }
.stats div {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 12px;
  padding: 8px 4px;
}
.stats .lbl {
  display: block;
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.stats strong {
  font-size: 0.95rem;
  text-transform: capitalize;
}

button {
  font: inherit;
  border: none;
  cursor: pointer;
}
button:active { transform: scale(0.98); }

.primary, .secondary, .ghost {
  display: block;
  width: 100%;
  border-radius: 14px;
  padding: 14px 16px;
  margin: 0 0 10px;
  font-weight: 700;
  font-size: 1.05rem;
}

.primary {
  background: linear-gradient(180deg, #9bffb8, #4fd68a);
  color: #0a2014;
  box-shadow: 0 6px 0 #2a8f58, 0 10px 24px rgba(125, 255, 160, 0.25);
}

.secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid var(--line);
}

.ghost {
  background: transparent;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px;
}

.diff-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}

.diff-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 8px;
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-height: 88px;
}
.diff-card:hover, .diff-card:focus {
  border-color: var(--green);
  background: rgba(125, 255, 160, 0.1);
}
.diff-stars {
  color: var(--amber);
  font-size: 0.85rem;
  letter-spacing: 2px;
}
.diff-card strong { font-size: 1rem; }
.diff-card small { color: var(--muted); font-size: 0.75rem; }
.diff-icon { font-size: 1.4rem; line-height: 1; }
.daily-done {
  position: absolute;
  top: 6px;
  right: 8px;
  color: var(--green);
  font-weight: 800;
}
.diff-card { position: relative; }

.chip-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}
.mode-chip {
  flex: 1;
  padding: 12px 8px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 700;
}
.mode-chip.active {
  border-color: var(--green);
  background: rgba(125, 255, 160, 0.15);
  color: var(--green);
}
.mode-chip.locked {
  opacity: 0.4;
}

.setting-label {
  margin: 8px 0 6px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-align: left;
}
.setting-help {
  margin: 0 0 14px;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: left;
  line-height: 1.35;
}
.check-row {
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  margin: 0 0 12px;
  font-weight: 600;
  font-size: 1rem;
  min-height: 44px;
}
.check-row input {
  width: 22px;
  height: 22px;
  accent-color: var(--green);
}

.big-next {
  font-size: 1.2rem !important;
  padding: 18px 16px !important;
  margin-top: 4px;
}
.win-card h2 {
  color: var(--green);
}

.menu-card.wide {
  width: min(360px, 100%);
}

.adv-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 280px;
  overflow-y: auto;
  margin-bottom: 12px;
  text-align: left;
}
.adv-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  color: var(--text);
  text-align: left;
  font: inherit;
}
.adv-item.locked {
  opacity: 0.45;
}
.adv-item.current {
  border-color: var(--green);
  background: rgba(125, 255, 160, 0.1);
}
.adv-item .adv-ico {
  font-size: 1.4rem;
  width: 2rem;
  text-align: center;
}
.adv-item .adv-meta {
  flex: 1;
  min-width: 0;
}
.adv-item .adv-meta strong {
  display: block;
  font-size: 0.95rem;
}
.adv-item .adv-meta small {
  color: var(--muted);
  font-size: 0.75rem;
}
.adv-item .adv-state {
  font-size: 0.85rem;
  color: var(--green);
}

.field {
  display: grid;
  grid-template-columns: 64px 1fr 40px;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  text-align: left;
  font-size: 0.85rem;
  color: var(--muted);
}
.field input[type="range"] {
  width: 100%;
  accent-color: var(--green);
}
.field strong {
  color: var(--text);
  font-size: 0.85rem;
  text-align: right;
}
.text-input {
  grid-column: 2 / -1;
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text);
  font: inherit;
}
.chip-row.wrap {
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.chip-row.wrap .mode-chip {
  flex: 0 0 auto;
  min-width: 72px;
  font-size: 0.85rem;
  padding: 10px 8px;
}
.seed-line {
  font-family: ui-monospace, monospace;
  font-size: 0.72rem;
  color: var(--muted);
  word-break: break-all;
  margin: 0 0 10px;
}
.unlock-line {
  color: var(--amber);
  font-weight: 700;
  font-size: 0.9rem;
  margin: 0 0 10px;
}

.first-tip {
  margin: 0 0 12px;
  padding: 10px 12px;
  border-radius: 12px;
  background: rgba(125, 255, 160, 0.12);
  border: 1px solid rgba(125, 255, 160, 0.35);
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.35;
}
.first-tip b { color: var(--green); }

.how {
  text-align: left;
  background: rgba(0, 0, 0, 0.25);
  border-radius: 12px;
  padding: 10px 12px;
  margin: 0 0 12px;
  font-size: 0.88rem;
  color: var(--muted);
}
.how ol { margin: 0; padding-left: 1.2rem; }
.how li { margin: 0.35rem 0; }
.how b { color: var(--text); }

.ver {
  margin: 8px 0 0;
  font-size: 0.72rem;
  color: var(--muted);
  opacity: 0.8;
}

.icon-btn {
  position: absolute;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(12, 18, 36, 0.82);
  border: 1px solid var(--line);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}
#btnPauseMenu {
  top: 48px;
  left: 12px;
}
.hint-btn {
  top: 48px;
  right: 12px;
  background: rgba(255, 213, 106, 0.2);
  border-color: rgba(255, 213, 106, 0.4);
  color: var(--amber);
}
.restart-btn {
  top: 104px;
  right: 12px;
}

.hint {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  margin: 0;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.4);
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.78rem;
  pointer-events: none;
  white-space: nowrap;
}