:root {
  --primary: #5b5bd6;
  --primary-dark: #4343b3;
  --primary-soft: #eeeeff;
  --accent: #ffb84d;
  --green: #1f9d72;
  --red: #d94c62;
  --ink: #1f2744;
  --muted: #69708a;
  --surface: #ffffff;
  --surface-2: #f7f8fc;
  --border: #e3e6f1;
  --shadow: 0 18px 50px rgba(49, 55, 99, 0.11);
  --radius: 24px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(91,91,214,.12), transparent 28rem),
    radial-gradient(circle at 100% 20%, rgba(255,184,77,.14), transparent 24rem),
    var(--surface-2);
  font-family: Inter, ui-rounded, "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, input, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 4px solid rgba(91,91,214,.22);
  outline-offset: 2px;
}

.app-shell { min-height: 100vh; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 10px clamp(16px, 4vw, 52px);
  background: rgba(255,255,255,.88);
  border-bottom: 1px solid rgba(227,230,241,.85);
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 12px; color: inherit; background: none; border: 0; padding: 0; text-align: left; }
.brand-mark {
  display: grid; place-items: center; width: 48px; height: 48px; border-radius: 15px;
  color: white; font-weight: 900; font-size: 14px; letter-spacing: -1px;
  background: linear-gradient(135deg, #7272eb, #4848bb);
  box-shadow: 0 10px 20px rgba(91,91,214,.25);
}
.brand strong { display: block; font-size: 18px; }
.brand small { display: block; margin-top: 2px; color: var(--muted); }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.score-pill { display: inline-flex; gap: 7px; align-items: center; padding: 9px 13px; border-radius: 999px; background: #fff7dd; border: 1px solid #ffe7a4; white-space: nowrap; }
.icon-button { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 13px; border: 1px solid var(--border); background: white; font-size: 20px; }

main { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 34px 0 calc(100px + var(--safe-bottom)); }
.page { display: none; animation: enter .28s ease; }
.page.active { display: block; }
@keyframes enter { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.hero-card {
  overflow: hidden; position: relative; display: grid; grid-template-columns: 1.25fr .75fr; gap: 30px; align-items: center;
  min-height: 360px; padding: clamp(28px, 6vw, 68px); border-radius: 34px; color: white;
  background: linear-gradient(135deg, #5050c8 0%, #6d68e9 55%, #8d7af2 100%); box-shadow: var(--shadow);
}
.hero-card::before { content:""; position:absolute; inset:auto -100px -120px auto; width:320px; height:320px; border-radius:50%; background:rgba(255,255,255,.08); }
.eyebrow { display: block; margin-bottom: 8px; color: var(--primary); font-size: 12px; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.hero-card .eyebrow { color: #dddfff; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 690px; margin-bottom: 18px; font-size: clamp(38px, 6vw, 68px); line-height: .98; letter-spacing: -.045em; }
h2 { margin-bottom: 0; font-size: clamp(30px, 5vw, 46px); letter-spacing: -.035em; }
h3 { font-size: 24px; letter-spacing: -.02em; }
.hero-card p { max-width: 650px; color: #eeefff; font-size: clamp(17px, 2vw, 21px); line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.hero-actions.centered { justify-content: center; }
.primary-button, .secondary-button {
  min-height: 48px; padding: 12px 20px; border-radius: 15px; border: 0; font-weight: 850; transition: .18s transform, .18s box-shadow, .18s background;
}
.primary-button { color: white; background: var(--primary); box-shadow: 0 10px 22px rgba(91,91,214,.22); }
.primary-button:hover { background: var(--primary-dark); transform: translateY(-1px); }
.secondary-button { color: var(--primary); background: white; border: 1px solid var(--border); }
.secondary-button:hover { background: var(--primary-soft); transform: translateY(-1px); }
.hero-card .primary-button { color: var(--primary-dark); background: white; }
.hero-card .secondary-button { color: white; background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.35); }
.compact { min-height: 42px; padding: 9px 14px; }
.full-width { width: 100%; }
.text-button { border: 0; color: var(--primary); background: none; font-weight: 800; }
.text-button.danger { color: var(--red); }

.number-orbit { position: relative; width: min(310px, 30vw); aspect-ratio: 1; justify-self: center; border: 2px dashed rgba(255,255,255,.3); border-radius: 50%; animation: float 4s ease-in-out infinite; }
.number-orbit div { position: absolute; inset: 27%; display: grid; place-items: center; border-radius: 50%; background: white; color: var(--primary); font-size: clamp(50px, 8vw, 90px); font-weight: 900; box-shadow: 0 18px 35px rgba(36,36,120,.28); }
.number-orbit span { position: absolute; display: grid; place-items: center; width: 48px; height: 48px; border-radius: 15px; color: var(--ink); background: white; font-weight: 900; box-shadow: 0 10px 30px rgba(34,34,94,.2); }
.number-orbit span:nth-child(1){ left:4%; top:18%; }.number-orbit span:nth-child(2){ right:2%; top:20%; }.number-orbit span:nth-child(3){ right:8%; bottom:13%; }.number-orbit span:nth-child(4){ left:14%; bottom:5%; }.number-orbit span:nth-child(5){ left:43%; top:-7%; }
@keyframes float { 50% { transform: translateY(-10px) rotate(2deg); } }

.home-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 24px; }
.feature-card { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 16px; min-height: 116px; padding: 22px; text-align: left; color: var(--ink); background: white; border: 1px solid var(--border); border-radius: 22px; box-shadow: 0 10px 30px rgba(49,55,99,.06); transition: .2s transform, .2s box-shadow; }
.feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.feature-card strong { display: block; font-size: 19px; }
.feature-card small { display: block; margin-top: 5px; color: var(--muted); line-height: 1.45; }
.feature-icon { display: grid; place-items: center; width: 58px; height: 58px; border-radius: 18px; font-size: 28px; }
.learn-card .feature-icon { background:#e9f1ff; }.practice-card .feature-icon{background:#fff0e6}.badge-card .feature-icon{background:#fff7d7}.progress-card .feature-icon{background:#e5f8f0}
.daily-tip { display: flex; gap: 16px; align-items: center; margin-top: 20px; padding: 20px 24px; border-radius: 20px; background: #fff8e9; border: 1px solid #f9e2ae; }
.daily-tip > span { font-size: 32px; }.daily-tip p { margin: 3px 0 0; color: var(--muted); }

.page-heading { display: flex; justify-content: space-between; gap: 20px; align-items: flex-end; margin-bottom: 24px; }
.workspace-grid { display: grid; grid-template-columns: 360px 1fr; gap: 20px; align-items: start; }
.panel { background: rgba(255,255,255,.96); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: 0 12px 38px rgba(49,55,99,.07); }
.controls-panel { position: sticky; top: 98px; display: grid; gap: 17px; padding: 24px; }
label > span { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 850; }
input, select { width: 100%; min-height: 50px; padding: 10px 13px; color: var(--ink); background: white; border: 1.5px solid var(--border); border-radius: 14px; }
input:hover, select:hover { border-color: #c6cae2; }
.two-column-fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-help { margin: -5px 0 0; color: var(--muted); font-size: 12px; line-height: 1.45; }
.field-hidden { display: none; }
.lesson-panel { min-height: 520px; padding: clamp(22px, 4vw, 34px); }
.lesson-heading { display: flex; gap: 15px; align-items: center; }
.lesson-icon { display: grid; place-items: center; flex: 0 0 auto; width: 64px; height: 64px; border-radius: 20px; background: var(--primary-soft); font-size: 32px; }
.lesson-heading h3 { margin-bottom: 0; }
.lesson-definition { margin: 24px 0; font-size: 19px; line-height: 1.65; }
.example-box { padding: 18px 20px; border-radius: 18px; background: #f3f9ff; border-left: 5px solid #61a8ee; }
.example-box p { margin: 7px 0 0; color: var(--muted); line-height: 1.55; }
.result-heading { display:flex; justify-content:space-between; align-items:center; margin: 26px 0 12px; }
.number-results { display: flex; flex-wrap: wrap; gap: 10px; max-height: 330px; overflow: auto; padding: 2px; }
.number-chip { display: inline-grid; place-items: center; min-width: 48px; min-height: 44px; padding: 8px 12px; border-radius: 14px; color: var(--primary-dark); background: var(--primary-soft); font-weight: 900; }
.table-chip { flex: 1 1 190px; justify-content: start; padding-left: 16px; }
.empty-state { width: 100%; padding: 35px; text-align:center; color:var(--muted); border:2px dashed var(--border); border-radius:18px; }

.lives { padding: 10px 14px; border-radius: 999px; background: white; border: 1px solid var(--border); letter-spacing: 3px; }
.setup-card { max-width: 780px; margin: 0 auto; padding: clamp(25px, 5vw, 46px); text-align:center; }
.setup-illustration { display:grid; place-items:center; width:90px; height:90px; margin:0 auto 18px; border-radius:28px; background:var(--primary-soft); font-size:48px; }
.setup-card > p { color:var(--muted); }
.setup-fields { display:grid; grid-template-columns: repeat(3, 1fr); gap:14px; margin:28px 0 22px; text-align:left; }
.practice-layout { display:grid; grid-template-columns: minmax(0, 1fr) 340px; gap:20px; align-items:start; }
.game-status { grid-column:1 / -1; display:grid; grid-template-columns:repeat(3,1fr); overflow:hidden; }
.game-status div { padding:17px 22px; text-align:center; border-right:1px solid var(--border); }.game-status div:last-child{border-right:0}.game-status span{display:block;color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.game-status strong{display:block;margin-top:5px;font-size:21px}
.question-card { padding: clamp(24px,5vw,45px); }
.question-meta { display:flex; justify-content:space-between; align-items:center; }
.question-meta > span { padding:8px 12px; color:var(--primary); background:var(--primary-soft); border-radius:999px; font-size:12px; font-weight:900; }
.question-card h3 { margin:28px 0; font-size:clamp(28px,5vw,42px); line-height:1.14; }
.answer-area { display:grid; grid-template-columns:repeat(2,1fr); gap:12px; }
.answer-choice { min-height:66px; padding:12px; color:var(--ink); background:white; border:2px solid var(--border); border-radius:18px; font-size:20px; font-weight:900; transition:.18s; }
.answer-choice:hover { border-color:#aaaee9; background:#f8f8ff; }
.answer-choice.selected { border-color:var(--primary); background:var(--primary-soft); box-shadow:0 0 0 3px rgba(91,91,214,.12); }
.answer-input { grid-column:1 / -1; min-height:65px; font-size:24px; text-align:center; font-weight:900; }
.question-actions { display:flex; justify-content:space-between; gap:12px; margin-top:26px; }
.hint-text { margin:18px 0 0; padding:14px 16px; color:#7c5b12; background:#fff8dd; border-radius:14px; line-height:1.55; }
.feedback-card { position:sticky; top:98px; padding:26px; text-align:center; }
.feedback-card.correct { border-top:6px solid var(--green); }.feedback-card.wrong { border-top:6px solid var(--red); }
.feedback-icon { font-size:54px; }.feedback-card h3{margin:8px 0 10px}.feedback-card > p{color:var(--muted);line-height:1.55}
.feedback-lesson { margin:20px 0; padding:16px; text-align:left; border-radius:16px; background:var(--surface-2); }
.feedback-lesson strong { display:block; margin-bottom:6px; }.feedback-lesson p{margin:0;color:var(--muted);line-height:1.5}
.round-complete { max-width:750px; margin:0 auto; padding:clamp(28px,6vw,55px); text-align:center; }
.round-badge { font-size:75px; animation:pop .55s ease; }@keyframes pop{50%{transform:scale(1.18) rotate(5deg)}}
.round-complete > p { color:var(--muted);font-size:18px; }
.round-stat-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0; }.round-stat-grid div{padding:18px;border-radius:18px;background:var(--surface-2)}.round-stat-grid span{display:block;color:var(--muted);font-size:12px;font-weight:800}.round-stat-grid strong{display:block;margin-top:7px;font-size:25px}

.badge-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.badge-item { position:relative; min-height:230px; padding:25px; text-align:center; background:white; border:1px solid var(--border); border-radius:24px; box-shadow:0 10px 30px rgba(49,55,99,.05); }
.badge-item.locked { filter:grayscale(1); opacity:.58; }.badge-emoji{font-size:55px}.badge-item h3{margin:13px 0 7px;font-size:19px}.badge-item p{color:var(--muted);font-size:14px;line-height:1.5}.badge-status{display:inline-block;margin-top:8px;padding:6px 10px;border-radius:999px;background:#e8f8f1;color:var(--green);font-size:11px;font-weight:900}.locked .badge-status{background:var(--surface-2);color:var(--muted)}
.stats-grid { display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:20px}.stat-card{padding:22px;background:white;border:1px solid var(--border);border-radius:22px}.stat-card span,.stat-card small{display:block;color:var(--muted)}.stat-card strong{display:block;margin:10px 0 8px;font-size:34px}.stat-card small{font-size:12px}
.topic-progress-panel{padding:26px}.topic-progress-panel > p{color:var(--muted)}.topic-progress-list{display:grid;gap:16px;margin-top:22px}.topic-progress-row{display:grid;grid-template-columns:160px 1fr 48px;gap:14px;align-items:center}.topic-progress-row strong{font-size:14px}.progress-track{height:12px;overflow:hidden;border-radius:999px;background:#e9ebf4}.progress-fill{height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--primary),#8d7af2)}.topic-progress-row span{color:var(--muted);font-size:12px;text-align:right}

.bottom-nav { position:fixed; left:50%; bottom:18px; z-index:30; display:flex; transform:translateX(-50%); padding:8px; border:1px solid rgba(227,230,241,.9); border-radius:22px; background:rgba(255,255,255,.93); box-shadow:0 16px 45px rgba(49,55,99,.18); backdrop-filter:blur(18px); }
.nav-item { min-width:88px; padding:8px 12px; border:0; border-radius:15px; color:var(--muted); background:transparent; }.nav-item span,.nav-item small{display:block}.nav-item span{font-size:21px}.nav-item small{margin-top:3px;font-size:11px;font-weight:800}.nav-item.active{color:var(--primary);background:var(--primary-soft)}
.hidden { display:none !important; }
.toast { position:fixed; left:50%; bottom:105px; z-index:50; max-width:calc(100% - 32px); padding:12px 18px; color:white; background:#252a42; border-radius:13px; opacity:0; transform:translate(-50%,12px); pointer-events:none; transition:.2s; }.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width: 900px) {
  .hero-card { grid-template-columns:1fr; }.number-orbit{display:none}.workspace-grid{grid-template-columns:1fr}.controls-panel{position:static}.practice-layout{grid-template-columns:1fr}.feedback-card{position:static}.badge-grid{grid-template-columns:repeat(2,1fr)}.stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 650px) {
  .topbar { min-height:64px;padding:8px 14px}.brand-mark{width:43px;height:43px}.brand small{display:none}.score-pill{padding:8px 10px}
  main{width:min(100% - 22px,1180px);padding-top:20px}.hero-card{min-height:0;padding:34px 24px;border-radius:25px}h1{font-size:42px}.home-grid{grid-template-columns:1fr}.feature-card{min-height:95px;padding:17px}.feature-icon{width:50px;height:50px}
  .page-heading{align-items:center}.page-heading .secondary-button{font-size:0}.page-heading .secondary-button::first-letter{font-size:18px}
  .two-column-fields,.setup-fields,.answer-area{grid-template-columns:1fr}.setup-fields{gap:11px}.answer-input{grid-column:auto}.game-status div{padding:13px 8px}.question-card{padding:24px 18px}.question-actions{flex-direction:column-reverse}.question-actions button{width:100%}.badge-grid{grid-template-columns:1fr}.stats-grid{grid-template-columns:1fr 1fr}.topic-progress-row{grid-template-columns:110px 1fr 38px}
  .bottom-nav{bottom:0;width:100%;justify-content:space-around;border-radius:20px 20px 0 0;padding:6px 4px calc(6px + var(--safe-bottom))}.nav-item{min-width:0;flex:1;padding:7px 3px}.toast{bottom:90px}
}
@media (max-width: 420px) {
  .topbar-actions .score-pill span{display:none}.hero-card h1{font-size:36px}.stats-grid{grid-template-columns:1fr}.round-stat-grid{grid-template-columns:1fr}.topic-progress-row{grid-template-columns:1fr 45px}.progress-track{grid-column:1 / -1;grid-row:2}.topic-progress-row span{grid-column:2;grid-row:1}
}
@media (prefers-reduced-motion: reduce) { *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important} }

/* Language selection */
.language-shortcut {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 42px;
  padding: 8px 12px;
  color: var(--primary-dark);
  background: white;
  border: 1px solid var(--border);
  border-radius: 13px;
  font-weight: 900;
}
.language-shortcut:hover { background: var(--primary-soft); }
.language-card { grid-column: 1 / -1; }
.language-card .feature-icon { background: #efeaff; }
.language-panel { max-width: 900px; margin: 0 auto; padding: clamp(24px, 5vw, 46px); }
.language-intro { display: flex; align-items: center; gap: 20px; margin-bottom: 28px; }
.language-intro h3 { margin-bottom: 7px; }
.language-intro p { margin-bottom: 0; color: var(--muted); line-height: 1.6; }
.language-illustration { display: grid; place-items: center; flex: 0 0 auto; width: 82px; height: 82px; border-radius: 25px; background: var(--primary-soft); font-size: 42px; }
.language-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 20px; }
.language-option {
  position: relative;
  display: grid;
  justify-items: center;
  min-height: 180px;
  padding: 24px 18px;
  color: var(--ink);
  background: white;
  border: 2px solid var(--border);
  border-radius: 22px;
  transition: .18s transform, .18s border-color, .18s box-shadow, .18s background;
}
.language-option:hover { transform: translateY(-2px); border-color: #aaaee9; box-shadow: 0 12px 28px rgba(49,55,99,.08); }
.language-option.selected { border-color: var(--primary); background: var(--primary-soft); box-shadow: 0 0 0 4px rgba(91,91,214,.1); }
.language-flag { font-size: 42px; }
.language-option strong { margin-top: 12px; font-size: 22px; }
.language-option small { margin-top: 4px; color: var(--muted); }
.language-check { position: absolute; top: 12px; right: 12px; display: none; place-items: center; width: 28px; height: 28px; color: white; background: var(--primary); border-radius: 50%; font-weight: 900; }
.language-option.selected .language-check { display: grid; }
.language-note { margin: 0 0 22px; padding: 14px 16px; color: var(--muted); background: var(--surface-2); border-radius: 14px; line-height: 1.55; }

@media (max-width: 650px) {
  .language-shortcut { padding: 8px 9px; }
  .language-shortcut span { display: none; }
  .language-grid { grid-template-columns: 1fr; }
  .language-option { grid-template-columns: auto 1fr; justify-items: start; align-items: center; min-height: 92px; padding: 16px 52px 16px 18px; text-align: left; }
  .language-option strong { margin: 0 0 3px 14px; }
  .language-option small { margin: 0 0 0 14px; grid-column: 2; }
  .language-flag { grid-row: 1 / 3; font-size: 34px; }
  .language-intro { align-items: flex-start; }
  .language-illustration { width: 62px; height: 62px; border-radius: 19px; font-size: 32px; }
  .language-card { grid-column: auto; }
  .page-heading .secondary-button { font-size: 14px; }
  .page-heading .secondary-button::first-letter { font-size: inherit; }
}

@media (max-width: 420px) {
  .topbar-actions { gap: 6px; }
  .language-shortcut { min-width: 42px; justify-content: center; }
}