/* Vocab 3000 — playful, all-ages UI, iOS-safe */
:root {
  --purple: #6C5CE7;
  --purple-2: #8E7BFF;
  --orange: #F9A826;
  --green: #27C46B;
  --red: #FF6B6B;
  --blue: #4DA3FF;
  --ink: #2D3436;
  --muted: #7A828B;
  --bg: #F4F5FB;
  --card: #FFFFFF;
  --shadow: 0 8px 24px rgba(80, 70, 180, .12);
  --radius: 22px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --tabbar-h: 64px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, "SF Pro Rounded", BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  overscroll-behavior: none;
  -webkit-user-select: none; user-select: none;
  touch-action: manipulation;
}
#app {
  min-height: 100dvh;
  padding: calc(var(--safe-top) + 12px) 16px calc(var(--safe-bottom) + var(--tabbar-h) + 16px);
  max-width: 560px;
  margin: 0 auto;
}
.hidden { display: none !important; }

/* ---------- top bar ---------- */
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.topbar h1 { font-size: 22px; margin: 0; letter-spacing: .2px; }
.topbar .logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 20px; }
.topbar .logo .lg { font-size: 26px; }
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--card); border-radius: 999px; padding: 7px 12px;
  font-weight: 700; font-size: 14px; box-shadow: var(--shadow);
}
.chip.fire { color: #E8590C; }

/* ---------- generic cards & buttons ---------- */
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px; margin-bottom: 16px;
}
.btn {
  border: 0; border-radius: 18px; padding: 16px 20px; font-size: 17px; font-weight: 700;
  min-height: 56px; display: flex; align-items: center; justify-content: center; gap: 10px;
  width: 100%; color: #fff; cursor: pointer;
  box-shadow: 0 6px 0 rgba(0,0,0,.16);
  transition: transform .08s ease, filter .15s ease;
}
.btn:active { transform: translateY(3px); filter: brightness(.95); box-shadow: 0 2px 0 rgba(0,0,0,.16); }
.btn.purple { background: var(--purple); }
.btn.orange { background: var(--orange); }
.btn.green  { background: var(--green); }
.btn.red    { background: var(--red); }
.btn.blue   { background: var(--blue); }
.btn.ghost  { background: #EEECFF; color: var(--purple); box-shadow: none; }
.btn.ghost2 { background: #E8F7EE; color: #1E8E52; box-shadow: none; }
.btn.small { min-height: 44px; padding: 10px 16px; font-size: 15px; border-radius: 14px; }
.btn:disabled { opacity: .45; }

/* mode tiles on home */
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.mode-tile {
  border: 0; text-align: left; padding: 16px; border-radius: var(--radius);
  color: #fff; min-height: 108px; display: flex; flex-direction: column; justify-content: space-between;
  cursor: pointer; box-shadow: 0 6px 0 rgba(0,0,0,.14); transition: transform .08s ease;
}
.mode-tile:active { transform: translateY(3px); }
.mode-tile .mi { font-size: 30px; }
.mode-tile .mt { font-weight: 800; font-size: 16px; margin-top: 8px; }
.mode-tile .ms { font-size: 12.5px; opacity: .92; font-weight: 600; }
.mode-tile.t-learn  { background: linear-gradient(135deg, #6C5CE7, #8E7BFF); }
.mode-tile.t-picture{ background: linear-gradient(135deg, #FF9F1A, #FF6B6B); }
.mode-tile.t-mean   { background: linear-gradient(135deg, #12B5CB, #4DA3FF); }
.mode-tile.t-review { background: linear-gradient(135deg, #27C46B, #12B886); }
.mode-tile .badge { position: absolute; }

/* progress ring on home */
.hero { display: flex; align-items: center; gap: 16px; }
.ring { position: relative; width: 108px; height: 108px; flex: none; }
.ring svg { width: 108px; height: 108px; transform: rotate(-90deg); }
.ring .ring-txt {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center; font-weight: 800;
}
.ring .ring-txt b { font-size: 22px; }
.ring .ring-txt span { font-size: 11px; color: var(--muted); font-weight: 700; }
.hero .htxt { flex: 1; }
.hero .htxt h2 { margin: 0 0 6px; font-size: 19px; }
.hero .htxt p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.45; }
.goalbar { height: 12px; background: #ECECF6; border-radius: 999px; overflow: hidden; margin-top: 10px; }
.goalbar > div { height: 100%; background: linear-gradient(90deg, var(--green), #12B886); border-radius: 999px; transition: width .4s ease; }

/* ---------- study session screens ---------- */
.session-top { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.session-top .quit {
  border: 0; background: var(--card); border-radius: 14px; padding: 10px 14px;
  font-size: 17px; font-weight: 800; box-shadow: var(--shadow); cursor: pointer;
}
.progress-track { flex: 1; height: 14px; background: #ECECF6; border-radius: 999px; overflow: hidden; }
.progress-track > div { height: 100%; background: var(--purple-2); border-radius: 999px; transition: width .3s; }
.session-count { font-weight: 800; color: var(--muted); font-size: 14px; min-width: 52px; text-align: right; }

/* flashcard */
.flashcard {
  position: relative; background: var(--card); border-radius: 28px;
  min-height: 380px; padding: 26px 20px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; margin-bottom: 16px; transition: transform .18s ease;
}
.flashcard .big-emoji { font-size: 96px; line-height: 1.15; }
.flashcard .word { font-size: 40px; font-weight: 800; margin: 10px 0 4px; letter-spacing: -.5px; }
.flashcard .ipa { color: var(--muted); font-size: 16px; margin-bottom: 4px; }
.flashcard .pos { color: #fff; background: var(--blue); font-size: 12.5px; font-weight: 700; padding: 3px 12px; border-radius: 999px; margin-top: 8px; }
.flashcard .meaning { font-size: 24px; font-weight: 700; margin-top: 14px; color: var(--purple); }
.flashcard .example { margin-top: 14px; font-size: 15px; color: var(--muted); font-style: italic; line-height: 1.5; }
.flashcard .example b { color: var(--ink); }
.letter-tile {
  font-size: 72px; font-weight: 900; color: #fff; width: 132px; height: 132px;
  display: flex; align-items: center; justify-content: center; border-radius: 30px;
  background: linear-gradient(135deg, var(--purple), #4DA3FF);
}
.replay {
  border: 0; background: #EEECFF; color: var(--purple); font-size: 18px; font-weight: 800;
  border-radius: 999px; padding: 14px 22px; margin-top: 18px; cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px; box-shadow: var(--shadow);
}
.replay:active { transform: scale(.96); }

/* quiz */
.quiz-word { text-align: center; margin: 8px 0 18px; }
.quiz-word .qw { font-size: 34px; font-weight: 800; }
.quiz-word .qi { color: var(--muted); font-size: 15px; }
.quiz-word .speakspeak { margin-top: 10px; }
.grid4 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.pic-tile {
  border: 0; background: var(--card); border-radius: 24px; padding: 18px 10px;
  min-height: 150px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; cursor: pointer; box-shadow: var(--shadow); position: relative;
  transition: transform .1s ease;
}
.pic-tile:active { transform: scale(.97); }
.pic-tile .pe { font-size: 64px; line-height: 1.2; }
.pic-tile.correct { background: #E4F9EE; outline: 4px solid var(--green); animation: pop .35s ease; }
.pic-tile.wrong { background: #FFE9E9; outline: 4px solid var(--red); animation: shake .4s ease; }
.pic-tile .pt-label { font-weight: 700; color: var(--muted); font-size: 13px; }
.letter-tile.sm { font-size: 40px; width: 78px; height: 78px; border-radius: 20px; }
.mean-tile { border: 0; background: var(--card); border-radius: 20px; padding: 16px; min-height: 72px;
  font-size: 17px; font-weight: 700; text-align: left; box-shadow: var(--shadow); cursor: pointer; width: 100%; color: var(--ink); }
.mean-tile.correct { background: #E4F9EE; outline: 4px solid var(--green); animation: pop .35s; }
.mean-tile.wrong { background: #FFE9E9; outline: 4px solid var(--red); animation: shake .4s; }
@keyframes pop { 0% { transform: scale(1); } 45% { transform: scale(1.07); } 100% { transform: scale(1); } }
@keyframes shake { 0%,100% { transform: translateX(0);} 25% { transform: translateX(-8px);} 75% { transform: translateX(8px);} }

/* Anki review buttons */
.grade-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 4px; }
.grade-grid .btn { padding: 12px 6px; min-height: 64px; flex-direction: column; gap: 2px; font-size: 15px; box-shadow: 0 4px 0 rgba(0,0,0,.16); }
.grade-grid .btn small { font-size: 11px; font-weight: 700; opacity: .9; }
.btn.g-again { background: var(--red); }
.btn.g-hard  { background: #F4900C; }
.btn.g-good  { background: var(--green); }
.btn.g-easy  { background: var(--blue); }

/* ---------- tabbar ---------- */
#tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 50;
  display: flex; justify-content: space-around; align-items: stretch;
  height: calc(var(--tabbar-h) + var(--safe-bottom));
  padding: 0 8px var(--safe-bottom);
  background: rgba(255,255,255,.92); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-top: 1px solid #E9E9F2;
}
#tabbar .tab {
  border: 0; background: none; flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 2px; font-size: 11px; font-weight: 700;
  color: var(--muted); cursor: pointer; padding: 6px 0;
}
#tabbar .tab .tab-ic { font-size: 22px; }
#tabbar .tab.active { color: var(--purple); }
#tabbar .tab .n-badge {
  position: relative; top: -26px; left: 14px; background: var(--red); color: #fff;
  border-radius: 999px; font-size: 10px; padding: 2px 6px; font-weight: 800;
}

/* ---------- toast & confetti ---------- */
#toast {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(var(--safe-bottom) + 84px);
  background: var(--ink); color: #fff; padding: 12px 18px; border-radius: 14px;
  font-weight: 700; font-size: 14.5px; z-index: 99; max-width: 86vw; text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,.25); opacity: 0; transition: opacity .25s ease;
}
#toast.show { opacity: 1; }
.confetti {
  position: fixed; top: -12px; z-index: 98; font-size: 18px;
  animation: fall linear forwards;
}
@keyframes fall { to { transform: translateY(105vh) rotate(540deg); opacity: .7; } }

/* ---------- progress & settings ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.stat-box { background: var(--card); border-radius: 18px; padding: 12px 8px; text-align: center; box-shadow: var(--shadow); }
.stat-box b { display: block; font-size: 22px; }
.stat-box span { font-size: 11.5px; color: var(--muted); font-weight: 700; }
.bar-row { display: flex; align-items: center; gap: 10px; margin: 10px 0; font-size: 14px; font-weight: 700; }
.bar-row .br-label { min-width: 108px; color: var(--muted); }
.bar-row .br-track { flex: 1; height: 12px; background: #ECECF6; border-radius: 999px; overflow: hidden; }
.bar-row .br-track > div { height: 100%; border-radius: 999px; }
.list-item {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--card); border-radius: 18px; padding: 14px 16px; margin-bottom: 10px;
  box-shadow: var(--shadow); font-weight: 700; font-size: 15px;
}
.list-item .li-sub { display: block; color: var(--muted); font-weight: 600; font-size: 12.5px; margin-top: 3px; }
.stepper { display: flex; align-items: center; gap: 12px; }
.stepper button {
  width: 38px; height: 38px; border-radius: 12px; border: 0; background: #EEECFF;
  color: var(--purple); font-size: 20px; font-weight: 800; cursor: pointer;
}
.stepper b { min-width: 26px; text-align: center; font-size: 17px; }
.search-input {
  width: 100%; border: 0; background: var(--card); border-radius: 16px; padding: 14px 16px;
  font-size: 16px; font-weight: 600; box-shadow: var(--shadow); margin-bottom: 12px;
  -webkit-user-select: text; user-select: text;
}
.word-row {
  display: flex; align-items: center; gap: 12px; background: var(--card);
  border-radius: 16px; padding: 12px 14px; margin-bottom: 8px; box-shadow: var(--shadow);
}
.word-row .wr-em { font-size: 28px; width: 36px; text-align: center; flex: none; }
.word-row .wr-main { flex: 1; min-width: 0; }
.word-row .wr-w { font-weight: 800; font-size: 16.5px; }
.word-row .wr-vi { color: var(--muted); font-size: 13px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.word-row .wr-state { flex: none; font-size: 18px; }
.wr-speaker { border: 0; background: #EEECFF; color: var(--purple); width: 40px; height: 40px; border-radius: 999px; font-size: 17px; cursor: pointer; flex: none; }

/* summary screen */
.summ-emoji { font-size: 78px; text-align: center; margin: 10px 0; }
.summ-title { text-align: center; font-size: 24px; font-weight: 800; margin: 0 0 6px; }
.summ-sub { text-align: center; color: var(--muted); font-weight: 600; margin: 0 0 18px; }

/* intro/first-run */
.intro-hero { text-align: center; padding: 30px 6px 10px; }
.intro-hero .ih-emoji { font-size: 92px; }
.intro-hero h2 { font-size: 26px; margin: 12px 0 8px; }
.intro-hero p { color: var(--muted); font-weight: 600; line-height: 1.5; margin: 0 0 22px; }

@media (min-width: 700px) {
  .grid4 { grid-template-columns: repeat(4, 1fr); }
  .modes { grid-template-columns: repeat(4, 1fr); }
  .mode-tile { min-height: 150px; }
}

/* deck selector chips (home) */
.deck-row {
  display: flex; gap: 8px; overflow-x: auto; padding: 4px 16px 8px;
  scrollbar-width: none;
}
.deck-row::-webkit-scrollbar { display: none; }
.deck-chip {
  flex: 0 0 auto; display: flex; flex-direction: column; gap: 1px; align-items: flex-start;
  background: #fff; border: 2px solid var(--line, #E7E7F2); border-radius: 16px;
  padding: 8px 14px; font: inherit; cursor: pointer;
}
.deck-chip .dc-name { font-weight: 800; font-size: 13.5px; color: #333; }
.deck-chip .dc-n { font-weight: 700; font-size: 12px; color: var(--muted); }
.deck-chip.active { border-color: var(--primary, #6C5CE7); background: #F3F2FD; }
.deck-chip.active .dc-name { color: var(--primary, #6C5CE7); }
.deck-chip.add { border-style: dashed; color: var(--muted); justify-content: center; }