:root {
  --bg: #EAF7F0;
  --bg-2: #F4FBF7;
  --card: #FFFFFF;
  --ink: #1F3A34;
  --ink-soft: #4C6A62;
  --coral: #FF8B6B;
  --coral-dark: #E96F4E;
  --yellow: #FFC857;
  --yellow-dark: #F0AD2E;
  --lavender: #8E7CC3;
  --lavender-dark: #7361AC;
  --mint-line: #CFEEDF;
  --wrong: #E9584A;
  --shadow: rgba(31, 58, 52, 0.12);
}
:root:not([data-theme="light"]) {
  @media (prefers-color-scheme: dark) {
    --bg: #12211D;
    --bg-2: #16281F;
    --card: #1B2F28;
    --ink: #EAF7F0;
    --ink-soft: #A9C7BC;
    --mint-line: #2A4A3E;
    --shadow: rgba(0, 0, 0, 0.35);
  }
}
:root[data-theme="dark"] {
  --bg: #12211D;
  --bg-2: #16281F;
  --card: #1B2F28;
  --ink: #EAF7F0;
  --ink-soft: #A9C7BC;
  --mint-line: #2A4A3E;
  --shadow: rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(circle at 20% -10%, var(--bg-2), var(--bg) 60%);
  color: var(--ink);
  font-family: 'Nunito', system-ui, sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 24px 14px 60px;
}
h1, h2, h3, .display {
  font-family: 'Baloo 2', 'Nunito', system-ui, sans-serif;
  margin: 0;
}
.app {
  width: 100%;
  max-width: 440px;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand h1 { font-size: 34px; color: var(--ink); }
.brand .sub { font-size: 18px; color: var(--ink-soft); font-weight: 700; }
.en-cap { display:block; font-size: 16px; font-weight: 700; color: var(--ink-soft); opacity:.8; margin-top:2px; }
.cta .en-cap { color: rgba(255,255,255,.85); font-size: 18px; margin-top:3px; }
.cta.ghost .en-cap { color: var(--ink-soft); }
h2 .en-cap, .section-title .en-cap { margin-top: 3px; }
.choice .en-cap { font-size: 15px; margin-top: 3px; }
.field label .en-cap { text-transform:none; font-weight:700; margin-top:1px; }
.stat-box .l .en-cap { font-size: 14px; margin-top:1px; }
.prompt .en-cap { margin-top: 2px; }
.mascot {
  width: 46px; height: 46px; flex: none;
}
.navbtn {
  background: var(--card);
  border: none;
  width: 40px; height: 40px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 10px var(--shadow);
  cursor: pointer;
  color: var(--ink);
}
.card {
  background: var(--card);
  border-radius: 22px;
  padding: 20px;
  box-shadow: 0 10px 26px var(--shadow);
  margin-bottom: 16px;
}
.screen { display: none; animation: fadein .25s ease; }
.screen.active { display: block; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px);} to { opacity:1; transform: translateY(0);} }

/* Dashboard */
.goal-row { display:flex; align-items:center; gap:16px; }
.ring-wrap { position: relative; width: 92px; height: 92px; flex: none; }
.ring-wrap svg { transform: rotate(-90deg); }
.ring-bg { fill:none; stroke: var(--mint-line); stroke-width: 10; }
.ring-fg { fill:none; stroke: var(--coral); stroke-width: 10; stroke-linecap: round; transition: stroke-dashoffset .5s ease; }
.ring-label { position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; }
.ring-label b { font-family:'Baloo 2'; font-size:32px; }
.ring-label span { font-size:15px; color:var(--ink-soft); font-weight:700; }
.goal-text h2 { font-size: 27px; margin-bottom: 4px; }
.goal-text p { margin:0; font-size: 20px; color: var(--ink-soft); font-weight:600; }
.dayspill-row { display:flex; gap:6px; margin-top:14px; }
.dayspill { flex:1; height:8px; border-radius:6px; background: var(--mint-line); }
.dayspill.done { background: var(--coral); }

.stat-grid { display:flex; gap:12px; margin-bottom:16px; }
.stat-box { flex:1; background: var(--card); border-radius:18px; padding:14px; text-align:center; box-shadow: 0 8px 20px var(--shadow); }
.stat-box .n { font-family:'Baloo 2'; font-size:36px; color: var(--coral-dark); }
.stat-box .l { font-size: 17px; color: var(--ink-soft); font-weight:700; margin-top:2px; }

.cta {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: 18px;
  background: var(--coral);
  color: #fff;
  font-family: 'Baloo 2';
  font-size: 30px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 8px 0 var(--coral-dark);
  transition: transform .06s ease;
}
.cta:active { transform: translateY(4px); box-shadow: 0 4px 0 var(--coral-dark); }
.cta.secondary { background: var(--lavender); box-shadow: 0 8px 0 var(--lavender-dark); }
.cta.ghost { background: var(--card); color: var(--ink); box-shadow: 0 4px 12px var(--shadow); font-size:24px; padding:14px; }
.cta:disabled { opacity: .5; cursor: not-allowed; box-shadow:none; }

.badges-row { display:flex; gap:10px; flex-wrap:wrap; margin-top: 10px; }
.badge {
  width: 52px; height: 52px; border-radius: 16px;
  background: var(--bg-2); border: 2px solid var(--mint-line);
  display:flex; align-items:center; justify-content:center;
  font-size: 24px;
}
.badge.locked { opacity: .35; filter: grayscale(1); }
.section-title { font-size:20px; font-weight:800; color: var(--ink-soft); text-transform: none; margin: 18px 0 8px 4px; }

/* Settings */
.field { margin-bottom: 16px; }
.field label { display:block; font-size: 20px; font-weight: 800; color: var(--ink-soft); margin-bottom: 8px; }
.choice-row { display:flex; gap:8px; }
.choice {
  flex:1; text-align:center; padding: 10px 6px; border-radius: 14px;
  border: 2px solid var(--mint-line); font-weight: 800; font-size: 20px;
  cursor:pointer; color: var(--ink-soft); background: var(--bg-2);
}
.choice.selected { border-color: var(--coral); color: var(--coral-dark); background: #fff2ec; }
:root[data-theme="dark"] .choice.selected, :root:not([data-theme="light"]) .choice.selected { background: #3a241d; }
input[type=email], input[type=text] {
  width: 100%; padding: 12px 14px; border-radius: 14px; border: 2px solid var(--mint-line);
  font-family:'Nunito'; font-size: 22px; background: var(--bg-2); color: var(--ink);
}
input:focus, .choice:focus-visible, .cta:focus-visible, .navbtn:focus-visible { outline: 3px solid var(--lavender); outline-offset:2px; }
#typeInput { text-align:center; font-size:28px; font-weight:800; font-family:'Baloo 2'; letter-spacing: 0.5px; }
#typeInput.ok { border-color:#4CAF7D; background:#e5f6ec; color:#2f7a52; }
#typeInput.no { border-color: var(--wrong); background:#fdeceb; color: var(--wrong); }
.write-divider { display:flex; align-items:center; gap:8px; margin: 18px 0 10px; }
.write-divider::before, .write-divider::after { content:''; flex:1; height:1px; background: var(--mint-line); }
.write-divider span { font-size: 17px; font-weight: 800; color: var(--ink-soft); white-space: nowrap; }
.write-row { display:flex; align-items:center; gap:8px; }
.write-row input { flex:1; }

/* Quiz */
.quiz-top { display:flex; align-items:center; gap:10px; margin-bottom: 18px; }
.progressbar { flex:1; height:10px; border-radius:8px; background: var(--mint-line); overflow:hidden; }
.progressbar > div { height:100%; background: var(--yellow); border-radius:8px; transition: width .3s ease; }
.quiz-close { font-size: 30px; background:none; border:none; color: var(--ink-soft); cursor:pointer; }

.word-card { text-align:center; padding: 26px 10px 20px; }
.word-pic {
  font-size: 56px; line-height:1; margin: 0 auto 6px;
  width: 88px; height: 88px; border-radius: 50%;
  background: var(--bg-2); display:flex; align-items:center; justify-content:center;
}
.hint-line {
  display:inline-flex; flex-direction:column; align-items:center; text-align:center;
  max-width: 92%; background: var(--bg-2); border-radius: 14px; padding: 8px 14px;
  font-size: 19px; font-weight: 700; color: var(--ink-soft); margin-bottom: 10px; line-height:1.35;
}
.hint-line .en-cap { margin-top:1px; }
.word-en { font-family:'Baloo 2'; font-size: 58px; color: var(--ink); }
.word-vi { font-size: 34px; font-weight: 800; color: var(--ink); }
.pron { font-size: 21px; color: var(--ink-soft); font-weight:700; margin-top:4px; }
.prompt { text-align:center; font-weight:800; font-size: 22px; color: var(--ink-soft); margin: 14px 0 12px; }
.options { display:grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.opt {
  padding: 14px 8px; border-radius: 16px; border: 2px solid var(--mint-line);
  background: var(--bg-2); font-weight: 800; font-size: 22px; color: var(--ink);
  cursor:pointer; text-align:center;
}
.opt.correct { border-color:#4CAF7D; background:#e5f6ec; color:#2f7a52; }
.opt.wrong { border-color: var(--wrong); background:#fdeceb; color: var(--wrong); }
.opt.dim { opacity:.55; }
.feedback { text-align:center; font-family:'Baloo 2'; font-size:26px; margin-top:14px; min-height: 22px; }
.feedback.good { color:#2f7a52; }
.feedback.bad { color: var(--wrong); }

/* Results */
.result-hero { text-align:center; padding: 10px 0 4px; }
.result-hero .big { font-size: 46px; }
.result-hero h2 { font-size: 32px; margin-top:6px; }
.result-hero p { color: var(--ink-soft); font-weight:700; font-size:20px; margin-top:4px;}
.result-list { max-height: 220px; overflow-y:auto; margin-top: 6px; }
.result-row { display:flex; justify-content:space-between; align-items:center; padding:9px 4px; border-bottom: 1px solid var(--mint-line); font-size:22px; }
.result-row:last-child { border-bottom:none; }
.result-row .r-en { font-weight:800; }
.result-row .r-vi { color: var(--ink-soft); }
.tag-ok { color:#2f7a52; font-size:26px; }
.tag-no { color: var(--wrong); font-size:26px; }

/* Report / email */
.report-box { background: var(--bg-2); border-radius:16px; padding:14px; font-size:20px; color: var(--ink-soft); font-weight:600; white-space:pre-wrap; max-height:200px; overflow-y:auto; margin-bottom:14px; line-height:1.6; }
.toast {
  position: fixed; left:50%; bottom: 24px; transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 12px 18px; border-radius: 14px;
  font-weight:700; font-size:20px; box-shadow: 0 8px 20px var(--shadow); z-index: 50;
  opacity:0; pointer-events:none; transition: opacity .25s ease, bottom .25s ease;
  max-width: 90%; text-align:center;
}
.toast.show { opacity:1; bottom: 34px; }

.confetti-layer { position: fixed; inset:0; pointer-events:none; z-index: 40; overflow:hidden; }
.confetti-piece { position:absolute; top:-20px; width:8px; height:14px; border-radius:2px; animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(360deg); opacity: .9; } }

.tabs { display:flex; gap:8px; margin-top: 18px; }
.tabs button {
  flex:1; padding: 10px; border-radius: 14px; border:none; background: var(--card);
  font-weight:800; font-size:19px; color: var(--ink-soft); box-shadow: 0 4px 10px var(--shadow); cursor:pointer;
}
.tabs button.active { background: var(--coral); color:#fff; }

.cheer-bubble {
  display:flex; align-items:flex-start; gap:8px;
  background: #F1ECFB; border: 2px solid #DCD2F5;
  border-radius: 16px; padding: 10px 12px; margin-bottom: 14px;
  font-size: 20px; font-weight: 700; color: var(--lavender-dark);
}
:root[data-theme="dark"] .cheer-bubble, :root:not([data-theme="light"]) .cheer-bubble {
  @media (prefers-color-scheme: dark) { background:#251F38; border-color:#3B3157; color:#C7B8F0; }
}
:root[data-theme="dark"] .cheer-bubble { background:#251F38; border-color:#3B3157; color:#C7B8F0; }
.cheer-bubble .icon { font-size: 18px; flex: none; line-height:1; }
.cheer-bubble.cheer-anim { animation: cheerPop .5s ease; }
.cheer-bubble.cheer-anim .icon { animation: cheerIconPop .5s ease; }
@keyframes cheerPop { 0%{opacity:.3; transform: translateY(3px);} 60%{opacity:1; transform: translateY(-1px);} 100%{opacity:1; transform: translateY(0);} }
@keyframes cheerIconPop { 0%{transform: scale(.6) rotate(-8deg);} 55%{transform: scale(1.25) rotate(6deg);} 100%{transform: scale(1) rotate(0deg);} }
.cheer-bubble .en-cap { color: inherit; opacity:.75; }
.cheer-result {
  margin-top: 10px; font-size: 19px; font-weight: 700; color: var(--lavender-dark);
}
.cheer-result .en-cap { color: var(--ink-soft); opacity:.85; }

::-webkit-scrollbar { width:6px; }
::-webkit-scrollbar-thumb { background: var(--mint-line); border-radius:4px; }

/* Login + main menu */
.nav-group { display:flex; gap:8px; }
body[data-screen="screen-login"] .nav-group,
body[data-screen="screen-menu"] .nav-group { display:none; }
input[type=password] {
  width: 100%; padding: 12px 14px; border-radius: 14px; border: 2px solid var(--mint-line);
  font-family:'Nunito'; font-size: 22px; background: var(--bg-2); color: var(--ink);
}
.link-btn {
  background:none; border:none; padding:6px 0; cursor:pointer; text-align:left;
  font-family:'Nunito'; font-size:20px; font-weight:800; color: var(--lavender-dark);
}
.link-btn .en-cap { color: var(--ink-soft); }
.menu-btn { display:block; text-align:center; text-decoration:none; margin-bottom:16px; padding: 26px 16px; font-size: 36px; }
.menu-btn.ghost { font-size: 28px; padding: 18px 16px; }
.hidden { display:none !important; }