:root{
  --bg:#0b1220; --panel:#121c31; --panel2:#182642; --ink:#eef3ff; --muted:#9db1d8;
  --brand:#37c978; --brand2:#2f9dff; --gold:#ffcf5c; --bad:#ff6b6b; --radius:16px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;}
.topbar{display:flex;justify-content:space-between;align-items:center;
  padding:14px 18px;position:sticky;top:0;background:rgba(11,18,32,.92);z-index:5;backdrop-filter:blur(6px)}
.brand{font-weight:800;font-size:22px;letter-spacing:.3px}
.brand span{color:var(--brand)}
.topstats span{margin-left:12px;font-weight:700}
main{max-width:560px;margin:0 auto;padding:14px 16px 110px}
.screen.hidden{display:none}
.hidden{display:none !important}
.card{background:var(--panel);border-radius:var(--radius);padding:16px;margin-bottom:14px}
.card h2,.card h3{margin:0 0 8px}
.muted{color:var(--muted)}
button{font:inherit;cursor:pointer}
.btn{display:block;width:100%;padding:14px;border:none;border-radius:12px;
  background:var(--brand);color:#062b16;font-weight:800;font-size:16px;margin-top:10px}
.btn.secondary{background:var(--panel2);color:var(--ink)}
.btn.small{width:auto;display:inline-block;padding:9px 14px;font-size:14px;margin-top:0}
.btn:disabled{opacity:.45;cursor:default}
.opt{display:block;width:100%;text-align:left;background:var(--panel2);color:var(--ink);
  border:2px solid transparent;border-radius:12px;padding:13px 14px;margin:8px 0;font-size:16px}
.opt.sel{border-color:var(--brand2)}
.opt.right{border-color:var(--brand);background:#123522}
.opt.wrong{border-color:var(--bad);background:#3a1620}
input[type=text]{width:100%;padding:13px;border-radius:12px;border:2px solid var(--panel2);
  background:#0d1626;color:var(--ink);font-size:17px;margin:8px 0}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}
.chip{background:var(--panel2);border:none;color:var(--ink);padding:10px 14px;border-radius:999px;font-size:16px}
.chip.used{opacity:.3}
.answer-line{min-height:34px;background:#0d1626;border-radius:10px;padding:9px 12px;font-size:17px}
table.vocab{width:100%;border-collapse:collapse}
table.vocab td{padding:7px 4px;border-bottom:1px solid #1e2c49;vertical-align:top}
table.vocab td.en{font-weight:700;white-space:nowrap}
button.say{background:none;border:none;font-size:17px;padding:0 2px}
.dialogue p{margin:7px 0}
.dialogue .who{font-weight:800;color:var(--brand2)}
.dialogue .who.leo{color:var(--gold)}
.feedback{border-radius:12px;padding:12px;margin-top:10px;font-weight:600}
.feedback.ok{background:#123522}
.feedback.err{background:#3a1620}
.lesson-row{display:flex;align-items:center;gap:12px;background:var(--panel);border-radius:14px;
  padding:13px 14px;margin-bottom:10px;border:none;width:100%;text-align:left;color:var(--ink)}
.lesson-row .n{width:38px;height:38px;border-radius:50%;background:var(--panel2);
  display:flex;align-items:center;justify-content:center;font-weight:800;flex:none}
.lesson-row.done .n{background:var(--brand);color:#062b16}
.lesson-row.locked{opacity:.5}
.progressbar{height:10px;background:#0d1626;border-radius:99px;overflow:hidden;margin:8px 0}
.progressbar i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2))}
.tabbar{position:fixed;left:0;right:0;bottom:0;background:#0d1626;border-top:1px solid #1e2c49;
  display:flex;justify-content:space-around;padding:8px 4px calc(8px + env(safe-area-inset-bottom));z-index:6}
.tabbar button{background:none;border:none;color:var(--muted);font-size:19px;display:flex;
  flex-direction:column;align-items:center;gap:1px;position:relative}
.tabbar button small{font-size:10px}
.tabbar button.active{color:var(--brand)}
.badge{position:absolute;top:-4px;right:2px;background:var(--bad);color:#fff;font-size:11px;
  border-radius:99px;padding:1px 6px;font-weight:800}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:96px;background:var(--gold);
  color:#231a00;font-weight:800;padding:12px 18px;border-radius:12px;z-index:9;max-width:88vw;text-align:center}
.flashcard{min-height:150px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;gap:8px}
.flashcard .big{font-size:27px;font-weight:800}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stat-num{font-size:26px;font-weight:800}
.tag{display:inline-block;background:var(--panel2);border-radius:99px;padding:3px 10px;font-size:12px;color:var(--muted)}