:root {
  --bg: #f7f9f2;
  --ink: #1d2a1f;
  --muted: #6b7a6c;
  --green: #58cc02;
  --green-d: #46a302;
  --red: #ff4b4b;
  --red-d: #d63a3a;
  --blue: #1cb0f6;
  --yellow: #ffc800;
  --line: #e2e8dd;
  --card: #ffffff;
  --radius: 18px;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Nunito", "Segoe UI", system-ui, sans-serif;
  min-height: 100vh;
  overflow-x: hidden;
}
button, input { font: inherit; }
.wrap { max-width: 720px; margin: 0 auto; padding: 16px; }

.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 12px 16px; background: var(--card); border-bottom: 2px solid var(--line);
}
.logo { font-weight: 900; font-size: 1.4rem; color: var(--green-d); text-decoration: none; }
.logo span { color: var(--ink); }
.stats { display: flex; gap: 12px; font-weight: 800; font-size: 0.95rem; }
.stats span { white-space: nowrap; }

.card {
  background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 20px;
}
.muted { color: var(--muted); }
h1 { font-size: clamp(1.7rem, 5vw, 2.3rem); margin: 0.2em 0 0.4em; font-weight: 900; }
h2 { font-size: 1.25rem; margin: 0 0 0.6em; font-weight: 900; }

.btn {
  display: inline-block; cursor: pointer; border: 0; border-radius: 14px;
  padding: 12px 22px; font-weight: 900; font-size: 1rem; color: #fff; background: var(--green);
  box-shadow: 0 4px 0 var(--green-d); transition: transform .05s;
}
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--green-d); }
.btn:disabled { background: #b9c2b5; box-shadow: 0 4px 0 #9aa597; cursor: default; }
.btn.alt { background: #fff; color: var(--ink); border: 2px solid var(--line); box-shadow: 0 4px 0 var(--line); }
.btn.alt:active { box-shadow: 0 1px 0 var(--line); }

input[type="text"] {
  width: 100%; padding: 14px 16px; border-radius: 14px; border: 2px solid var(--line);
  font-size: 1.1rem; background: #fff;
}
input[type="text"]:focus { outline: none; border-color: var(--blue); }

/* ---------- entrada ---------- */
.welcome { text-align: center; padding-top: 32px; }
.welcome form { display: grid; gap: 14px; max-width: 360px; margin: 24px auto 0; }

/* ---------- trilha ---------- */
.courses { display: flex; gap: 8px; margin: 8px 0 18px; }
.tab {
  cursor: pointer; border: 2px solid var(--line); background: #fff; border-radius: 14px; padding: 10px 16px; font-weight: 900;
}
.tab.on { border-color: var(--green); color: var(--green-d); }
.unit { margin: 24px 0 10px; }
.unit-head { background: var(--green); color: #fff; border-radius: 16px; padding: 14px 18px; }
.unit-head h2 { color: #fff; margin: 0; }
.unit-head small { opacity: 0.9; font-weight: 700; }
.path { display: flex; flex-direction: column; align-items: center; gap: 12px; margin: 16px 0; }
.node {
  width: 74px; height: 74px; border-radius: 50%; border: 0; cursor: pointer;
  font-weight: 900; font-size: 1.3rem; color: #fff; background: var(--green);
  box-shadow: 0 6px 0 var(--green-d);
}
.node.done { background: var(--yellow); box-shadow: 0 6px 0 #d9a900; color: #5a4700; }
.node.locked { background: #d8ded5; box-shadow: 0 6px 0 #b9c2b5; color: #8a9a88; cursor: not-allowed; }
.node:not(.locked):active { transform: translateY(4px); box-shadow: 0 2px 0 var(--green-d); }
.node-label { font-size: 0.9rem; font-weight: 800; color: var(--muted); text-align: center; }

/* ---------- lição ---------- */
.lesson-top { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.bar { flex: 1; height: 14px; border-radius: 999px; background: var(--line); overflow: hidden; }
.bar > i { display: block; height: 100%; width: 0; background: var(--green); border-radius: 999px; transition: width .3s; }
.hearts { font-weight: 900; color: var(--red); white-space: nowrap; }
.prompt { font-size: 1.35rem; font-weight: 900; margin: 6px 0 18px; }
.speak {
  width: 84px; height: 84px; border-radius: 50%; border: 0; background: var(--blue); color: #fff; font-size: 2rem;
  cursor: pointer; box-shadow: 0 6px 0 #0f8fcc; margin: 6px 0 18px;
}
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.opt {
  cursor: pointer; text-align: left; padding: 16px; border-radius: 16px; background: #fff;
  border: 2px solid var(--line); box-shadow: 0 3px 0 var(--line); font-weight: 800; font-size: 1.05rem;
}
.opt.sel { border-color: var(--blue); background: #e8f7fe; }
.opt.ok { border-color: var(--green); background: #e9f9d8; }
.opt.bad { border-color: var(--red); background: #ffecec; }
@media (max-width: 480px) { .options { grid-template-columns: 1fr; } }

.chips { display: flex; flex-wrap: wrap; gap: 10px; min-height: 56px; padding: 12px; border-radius: 16px; background: #fff; border: 2px dashed var(--line); margin-bottom: 16px; }
.chip {
  cursor: pointer; border: 2px solid var(--line); border-radius: 12px; padding: 10px 14px; background: #fff;
  font-weight: 800; font-size: 1.05rem; box-shadow: 0 3px 0 var(--line);
}
.chip.pool { background: #fff; }
.chips.answer { min-height: 70px; }

.pairs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pairs .col { display: grid; gap: 10px; align-content: start; }
.pairs .opt { text-align: center; }
.pairs .opt.paired { border-color: var(--blue); }
.pairs .opt.used { opacity: 0.4; }

.footer {
  position: fixed; left: 50%; bottom: 0; transform: translateX(-50%); width: min(100%, 720px); z-index: 4;
  padding: 16px; border-top: 2px solid var(--line);
  background: var(--card); display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 92px;
}
.in-lesson { padding-bottom: 130px; }
.footer.ok { background: #e9f9d8; }
.footer.bad { background: #ffecec; }
.footer .msg { font-weight: 900; font-size: 1.05rem; }
.footer .msg small { display: block; font-weight: 700; color: var(--ink); margin-top: 4px; }
.footer.ok .msg { color: var(--green-d); }
.footer.bad .msg { color: var(--red-d); }

.result { text-align: center; padding: 28px 16px; }
.result .big { font-size: 3rem; font-weight: 900; color: var(--green-d); }
.result .row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.err { color: var(--red-d); font-weight: 800; }