* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

:root {
  color-scheme: dark;
  --bg1: #000000;
  --bg2: #14100C;
  --card: #171412;
  --card-border: #2E2A26;
  --text: #E8DDD0;
  --text-dim: #9B8E80;
  --accent: #E8832E;
  --accent-soft: #F0944A;
  --green: #5BBF6F;
  --red: #E86060;
  --dark: #1A1612;
}

html, body { height: 100%; overscroll-behavior: none; }
html { background: #000000; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #000000;
  background-image: linear-gradient(160deg, var(--bg1) 0%, var(--bg2) 100%);
  color: var(--text);
  user-select: none;
  -webkit-user-select: none;
}

.screen {
  display: none;
  flex-direction: column;
  min-height: 100dvh;
  padding: max(16px, env(safe-area-inset-top)) 16px max(16px, env(safe-area-inset-bottom));
}
.screen.active { display: flex; }

/* ---------- HOME ---------- */
.lang-seg {
  display: inline-flex;
  margin-top: 20px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 4px;
}
.lang-opt {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  padding: 10px 20px;
  border-radius: 999px;
  cursor: pointer;
}
.lang-opt.active { background: var(--accent); color: var(--dark); }
.home-top { text-align: center; margin-top: 6vh; }
.logo {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -1px;
}
.logo span { color: var(--accent); }
.tagline { color: var(--text-dim); margin-top: 4px; font-size: 1.05rem; }

.mode-cards { display: flex; flex-direction: column; gap: 16px; margin-top: 5vh; }
.mode-card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  padding: 22px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text);
  font-family: inherit;
  cursor: pointer;
  transition: transform .1s;
}
.mode-card:active { transform: scale(0.97); }
.mode-emoji { font-size: 2.4rem; }
.mode-name { font-size: 1.4rem; font-weight: 800; flex: 1; text-align: left; }
.mode-progress { color: var(--text-dim); font-size: .95rem; font-weight: 600; }

.home-stats {
  margin-top: 10px;
  text-align: center;
  color: var(--text-dim);
  font-size: .95rem;
  padding: 12px;
}

.hidden { display: none !important; }

.btn-install {
  margin: 22px auto 0;
  border-radius: 18px;
  border: none;
  background: var(--accent);
  color: var(--dark);
  font-family: inherit;
  font-weight: 800;
  font-size: 1.1rem;
  padding: 16px 28px;
  cursor: pointer;
}
.btn-install + .home-stats { margin-top: 0; }

/* ---------- MODAL ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 50;
}
.modal-box {
  background: linear-gradient(160deg, #1E1812 0%, #0C0A08 100%);
  border: 1px solid var(--accent);
  border-radius: 24px;
  padding: 28px 24px;
  max-width: 340px;
  width: 100%;
  text-align: center;
}
.modal-icon { font-size: 2.6rem; }
.modal-title { font-size: 1.4rem; font-weight: 900; margin: 10px 0 16px; }
.modal-steps {
  text-align: left;
  color: var(--text);
  font-size: 1.05rem;
  line-height: 1.5;
  margin: 0 0 20px;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.share-glyph { vertical-align: -4px; color: var(--accent-soft); }
.modal-box .btn { width: 100%; }

/* ---------- BARS ---------- */
.bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.bar h2 { font-size: 1.3rem; font-weight: 800; flex: 1; text-align: center; }
.bar-spacer { width: 44px; }
.btn-back {
  width: 44px; height: 44px;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}

/* ---------- LEVELS ---------- */
.seg {
  display: flex;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 4px;
  margin-bottom: 16px;
}
.seg-btn {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-weight: 800;
  font-size: 1rem;
  padding: 12px;
  border-radius: 12px;
  cursor: pointer;
}
.seg-btn.active { background: var(--accent); color: var(--dark); }

.level-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.level-tile {
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 10px 2px;
  cursor: pointer;
  transition: transform .1s;
}
.level-tile:active { transform: scale(0.95); }
.level-num { font-size: 1.05rem; font-weight: 900; }
.level-stars { font-size: .55rem; letter-spacing: 0; }
.level-tile.locked { opacity: .35; }
.level-tile.locked .level-num { font-size: .9rem; }
.level-best { font-size: .55rem; color: var(--text-dim); }

/* ---------- GAME ---------- */
.game-bar { margin-bottom: 6px; }
.round-dots { flex: 1; display: flex; justify-content: center; gap: 6px; }
.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
}
.dot.correct { background: var(--green); }
.dot.wrong { background: var(--red); }
.score-pill {
  min-width: 64px;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--accent);
}

.streak-banner {
  text-align: center;
  height: 28px;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--accent);
  opacity: 0;
  transition: opacity .15s;
}
.streak-banner.show { opacity: 1; }

.question-zone { text-align: center; margin-top: 4vh; }
.timer-track {
  height: 8px;
  border-radius: 999px;
  background: #2E2A26;
  overflow: hidden;
  margin: 0 24px 5vh;
}
.timer-fill {
  height: 100%;
  width: 100%;
  border-radius: 999px;
  background: var(--green);
}
.question {
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: 2px;
}

.answers {
  margin-top: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding-bottom: 8px;
}
.answer-btn {
  border-radius: 22px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  font-size: 2rem;
  font-weight: 800;
  padding: 26px 0;
  cursor: pointer;
  transition: transform .08s, background .12s;
}
.answer-btn:active { transform: scale(0.96); }
.answer-btn.correct { background: var(--green); border-color: var(--green); color: var(--dark); }
.answer-btn.wrong { background: var(--red); border-color: var(--red); }
.answer-btn.dim { opacity: .4; }

/* ---------- FLIP CARDS ---------- */
.cards-progress {
  flex: 1;
  text-align: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent);
}
.card-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
}
.flip-card {
  width: 100%;
  max-width: 340px;
  aspect-ratio: 3 / 4;
  perspective: 1200px;
  cursor: pointer;
}
.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .45s;
}
.flip-card.flipped .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
}
.flip-front {
  background: var(--card);
  border: 2px solid var(--card-border);
}
.flip-back {
  background: linear-gradient(160deg, #1E1812 0%, #0C0A08 100%);
  border: 2px solid var(--accent);
  transform: rotateY(180deg);
}
.flip-q { font-size: 3.4rem; font-weight: 900; }
.flip-hint { color: var(--text-dim); font-size: 1rem; font-weight: 600; }
.flip-a { font-size: 4.5rem; font-weight: 900; color: var(--accent); }
.flip-eq { color: var(--text-dim); font-size: 1.3rem; font-weight: 700; }
.card-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding-bottom: 8px;
}
.card-buttons.hidden { visibility: hidden; }
.btn.know { background: var(--green); border-color: var(--green); color: var(--dark); font-size: 1.1rem; }
.btn.learn { background: var(--card); border-color: var(--red); color: var(--red); font-size: 1.1rem; }

/* ---------- RESULTS ---------- */
#screen-results { justify-content: center; position: relative; }
.results-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 2;
}
.stars { font-size: 3rem; letter-spacing: 8px; }
.star-off { opacity: .25; }
.result-title { font-size: 1.8rem; font-weight: 900; }
.result-score { font-size: 4rem; font-weight: 900; color: var(--accent); }
.result-sub { color: var(--text-dim); font-size: 1.05rem; min-height: 24px; }
.result-facts {
  color: var(--text-dim);
  font-size: .95rem;
  background: var(--card);
  border-radius: 16px;
  padding: 10px 16px;
  max-width: 320px;
}
.result-facts:empty { display: none; }
.result-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 320px;
  margin-top: 14px;
}
.btn {
  border-radius: 18px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  font-weight: 800;
  cursor: pointer;
}
.btn.big { padding: 16px; font-size: 1.15rem; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--dark); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: .35; }

#confetti {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

@keyframes pop {
  0% { transform: scale(0.6); }
  60% { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.pop { animation: pop .3s ease; }

.level-tile.all-tile {
  border-color: var(--accent);
  grid-column: 1 / -1;
  flex-direction: row;
  gap: 12px;
  padding: 12px;
}
.level-tile.all-tile .level-num { color: var(--accent-soft); font-size: 1.2rem; }
.level-tile.all-tile .level-stars { font-size: .85rem; letter-spacing: 1px; }
.level-tile.all-tile .level-best { font-size: .75rem; }

/* ---------- KEYPAD QUIZ ---------- */
.entry {
  text-align: center;
  font-size: 3rem;
  font-weight: 900;
  min-height: 68px;
  margin-top: 2vh;
  letter-spacing: 2px;
  color: var(--accent-soft);
}
.entry.good { color: var(--green); }
.entry.bad { color: var(--red); }
.keypad {
  margin-top: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding-bottom: 8px;
}
.key {
  border-radius: 18px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
  font-size: 1.7rem;
  font-weight: 800;
  padding: 16px 0;
  cursor: pointer;
  transition: transform .08s;
}
.key:active { transform: scale(0.94); }
.key-ok { background: var(--green); border-color: var(--green); color: var(--dark); }
.key-del { color: var(--red); }

/* ---------- BLITZ ---------- */
.blitz-row { display: flex; gap: 10px; margin-top: 16px; }
.blitz-btn {
  flex: 1;
  border-radius: 18px;
  border: none;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-soft) 100%);
  color: var(--dark);
  font-family: inherit;
  font-weight: 900;
  font-size: 1.2rem;
  padding: 18px;
  cursor: pointer;
  transition: transform .1s;
}
.blitz-btn:active { transform: scale(0.97); }
.blitz-clock {
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--accent);
}
.keypad.no-ok .key-ok { visibility: hidden; }

/* ---------- BIG NUMBERS TIER ---------- */
.tier-title {
  margin: 22px 4px 10px;
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}
#big-grid { grid-template-columns: repeat(3, 1fr); }
#big-grid .level-tile { padding: 14px 4px; }
#big-grid .level-num { font-size: .95rem; }
#big-grid .level-stars { font-size: .7rem; }

.hint-line {
  text-align: center;
  min-height: 30px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--accent-soft);
  letter-spacing: 1px;
}

/* ---------- CHALLENGE ---------- */
.btn.challenge { border-color: var(--accent); color: var(--accent-soft); }
.chal-info {
  text-align: center;
  color: var(--text-dim);
  font-weight: 700;
  font-size: 1.05rem;
  margin-bottom: 16px;
}
.chal-board {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}
.chal-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px 16px;
  font-weight: 800;
  font-size: 1.05rem;
}
.chal-row.first { border-color: var(--accent); }
.chal-rank { color: var(--text-dim); min-width: 24px; }
.chal-name { flex: 1; }
.chal-score { color: var(--accent); }
.chal-empty { text-align: center; color: var(--text-dim); padding: 30px 10px; font-weight: 600; }
.chal-buttons { margin-top: 14px; width: 100%; max-width: none; }
.name-input {
  width: 100%;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background: #14110F;
  color: var(--text);
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  padding: 14px;
  margin-bottom: 16px;
  outline: none;
}
.name-input:focus { border-color: var(--accent); }

.link-row {
  margin: 14px auto 0;
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 400px;
  align-self: center;
}
.applink-btn {
  flex: 1 1 0;
  min-width: 0;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--text-dim);
  font-family: inherit;
  font-weight: 700;
  font-size: .95rem;
  padding: 10px 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}
.link-row + .home-stats { margin-top: 12px; }
.btn-install + .link-row { margin-top: 12px; }
.applink-btn:disabled { opacity: .35; cursor: default; }
.blitz-link {
  width: 58px;
  border-radius: 18px;
  border: 1px solid var(--accent);
  background: var(--card);
  color: var(--accent-soft);
  font-family: inherit;
  font-size: 1.3rem;
  cursor: pointer;
  transition: transform .1s;
}
.blitz-link:active { transform: scale(0.94); }

.player-name {
  margin-top: 14px;
  display: inline-block;
  background: transparent;
  border: none;
  border-bottom: 1px dashed var(--card-border);
  color: var(--text-dim);
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;
  padding: 4px 6px;
  cursor: pointer;
}

/* ---------- GROUPS ---------- */
.group-list, .game-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.group-list { flex: 1; }
.game-list { flex: 1; overflow-y: auto; }
.group-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 16px;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text);
  font-family: inherit;
  cursor: pointer;
  text-align: left;
}
.group-row .grp-members { display: block; color: var(--text-dim); font-size: .85rem; font-weight: 600; margin-top: 2px; }
.rank-board {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 12px 14px;
  margin-bottom: 4px;
}
.rank-head { color: var(--text-dim); font-size: .85rem; font-weight: 700; margin-bottom: 8px; }
.rank-row { display: flex; gap: 10px; font-weight: 800; padding: 4px 0; }
.rank-row .r-name { flex: 1; }
.rank-row .r-wins { color: var(--accent); }
.rank-row .r-games { color: var(--text-dim); font-weight: 600; }
.game-row {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 12px 14px;
  cursor: pointer;
}
.game-head { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: .92rem; }
.game-label { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.game-date { color: var(--text-dim); font-size: .72rem; font-weight: 600; white-space: nowrap; }
.game-top { color: var(--accent); font-size: .85rem; white-space: nowrap; }
.game-detail { display: none; margin-top: 10px; border-top: 1px solid var(--card-border); padding-top: 10px; }
.game-row.open .game-detail { display: block; }
.game-score-row { display: flex; gap: 10px; font-weight: 700; padding: 3px 0; font-size: .98rem; }
.game-score-row .gs-name { flex: 1; }
.game-score-row .gs-score { color: var(--accent); }
.game-detail .btn { width: 100%; margin-top: 10px; padding: 12px; font-size: 1rem; }
.pick-list { display: flex; flex-direction: column; gap: 10px; }
.pick-list .btn { width: 100%; }
.chal-empty-sm { color: var(--text-dim); font-weight: 600; text-align: center; padding: 20px; }

/* ---------- PERSONAL RECORDS ---------- */
.records-card {
  margin-top: 22px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 14px 16px;
}
.rec-title {
  color: var(--text-dim);
  font-size: .85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}
.rec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 14px; }
.rec-cell { display: flex; align-items: baseline; gap: 8px; }
.rec-label { flex: 1; color: var(--text-dim); font-weight: 700; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rec-val { color: var(--accent); font-weight: 900; font-size: 1.15rem; }
.records-card + .link-row { margin-top: 12px; }

/* Android auto-dark repaints solid background-colors but leaves background-images alone. */
.lang-opt.active,
.seg-btn.active,
.btn.primary,
.btn-install,
.key-ok,
.btn.know {
  background-image: linear-gradient(var(--accent), var(--accent));
}
.key-ok, .btn.know { background-image: linear-gradient(var(--green), var(--green)); }

/* Android auto-dark dims translucent card backgrounds to invisibility; gradients survive. */
.mode-card, .level-tile, .lang-seg, .seg, .btn-back, .score-pill,
.records-card, .rank-board, .game-row, .group-row, .chal-row,
.key:not(.key-ok), .btn:not(.primary):not(.know):not(.ghost),
.flip-front, .result-facts, .name-input, .blitz-link, .timer-track {
  background-image: linear-gradient(var(--card), var(--card));
}
.version-tag { text-align: center; color: #4A443E; font-size: .7rem; font-weight: 600; padding-bottom: 4px; }