:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #efede6;
  --text: #1f2421;
  --muted: #6b716c;
  --border: #dedad0;
  --accent: #127a5b;      /* Brazilian green, softened */
  --accent-soft: #dff1e9;
  --warn: #b7791f;
  --warn-soft: #fbf0dc;
  --bad: #b23a3a;
  --bad-soft: #f8e3e1;
  --good: #1f7a43;
  --good-soft: #e1f3e7;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 2px 8px rgba(0,0,0,.04);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141816; --surface: #1c211f; --surface-2: #252b28; --text: #e8ebe8; --muted: #9aa39d;
    --border: #323a36; --accent: #4cc39a; --accent-soft: #1c3a2f; --warn: #e0a54a; --warn-soft: #3a2f1c;
    --bad: #e07a7a; --bad-soft: #3d2222; --good: #5fcf8a; --good-soft: #1d3626;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font); font-size: 16px; line-height: 1.5; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: var(--accent); }

.layout { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
nav.side { background: var(--surface); border-right: 1px solid var(--border); padding: 20px 12px; position: sticky; top: 0; height: 100vh; }
.brand { font-weight: 700; font-size: 1.25rem; padding: 0 10px 18px; letter-spacing: -.01em; }
.brand span { color: var(--accent); }
nav.side a { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px; color: var(--text); text-decoration: none; margin-bottom: 2px; }
nav.side a:hover { background: var(--surface-2); }
nav.side a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
nav.side .badge { margin-left: auto; font-size: .75rem; background: var(--accent); color: white; padding: 0 7px; border-radius: 10px; }
.ai-status { font-size: .8rem; color: var(--muted); padding: 16px 10px 0; }

main { padding: 32px 40px 80px; max-width: 920px; width: 100%; }
h1 { font-size: 1.7rem; margin: 0 0 4px; letter-spacing: -.02em; }
h2 { font-size: 1.2rem; margin: 28px 0 10px; }
h3 { font-size: 1.05rem; margin: 0 0 6px; }
.sub { color: var(--muted); margin: 0 0 24px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); margin-bottom: 14px; }
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }

.btn { border: 1px solid var(--border); background: var(--surface); padding: 8px 16px; border-radius: 8px; cursor: pointer; }
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: white; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.07); }
.btn.ghost { border-color: transparent; background: transparent; color: var(--muted); }
.btn.small { padding: 4px 10px; font-size: .85rem; }
.btn:disabled { opacity: .5; cursor: default; }

input[type=text], textarea, select { width: 100%; padding: 11px 13px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
input[type=text]:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
textarea { resize: vertical; min-height: 70px; }

.pill { display: inline-block; font-size: .75rem; padding: 2px 9px; border-radius: 20px; background: var(--surface-2); color: var(--muted); }
.pill.good { background: var(--good-soft); color: var(--good); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.bad { background: var(--bad-soft); color: var(--bad); }
.pill.accent { background: var(--accent-soft); color: var(--accent); }

.task { display: flex; gap: 14px; align-items: center; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); margin-bottom: 10px; }
.task .check { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--border); flex-shrink: 0; display: grid; place-items: center; font-size: .8rem; }
.task.done .check { background: var(--good); border-color: var(--good); color: white; }
.task.done .t-title { text-decoration: line-through; color: var(--muted); }
.t-title { font-weight: 600; }

.week { display: flex; gap: 6px; }
.week .day { flex: 1; text-align: center; font-size: .75rem; color: var(--muted); }
.week .bar { height: 46px; border-radius: 6px; background: var(--surface-2); margin-bottom: 4px; position: relative; overflow: hidden; }
.week .bar i { position: absolute; bottom: 0; left: 0; right: 0; background: var(--accent); border-radius: 6px; }
.stat { font-size: 1.8rem; font-weight: 700; letter-spacing: -.02em; }

.unit { display: grid; grid-template-columns: 44px 1fr auto; gap: 14px; align-items: start; }
.unit .num { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; background: var(--surface-2); color: var(--muted); }
.unit.active .num { background: var(--accent); color: white; }
.unit.done .num { background: var(--good-soft); color: var(--good); }
.steps { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.step { font-size: .8rem; padding: 4px 10px; border-radius: 6px; border: 1px solid var(--border); cursor: pointer; background: var(--surface); }
.step.done { background: var(--good-soft); border-color: transparent; color: var(--good); }
.step:hover { border-color: var(--accent); }

.flash { text-align: center; padding: 34px 20px; }
.flash .prompt { font-size: 1.6rem; font-weight: 600; margin: 8px 0 4px; }
.flash input { text-align: center; font-size: 1.2rem; max-width: 420px; margin: 18px auto 0; display: block; }
.result { margin-top: 16px; padding: 12px 14px; border-radius: 8px; text-align: left; }
.result.good { background: var(--good-soft); }
.result.warn { background: var(--warn-soft); }
.result.bad { background: var(--bad-soft); }
.progressbar { height: 6px; background: var(--surface-2); border-radius: 4px; overflow: hidden; margin-bottom: 16px; }
.progressbar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }

.bank, .answer-line { display: flex; flex-wrap: wrap; gap: 8px; min-height: 52px; padding: 10px; border-radius: 10px; }
.answer-line { border-bottom: 2px solid var(--border); border-radius: 0; margin-bottom: 14px; }
.tile { padding: 7px 13px; border: 1px solid var(--border); border-bottom-width: 3px; border-radius: 9px; background: var(--surface); cursor: pointer; user-select: none; }
.tile:hover { border-color: var(--accent); }
.tile.used { visibility: hidden; }

.chat { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.msg { max-width: 78%; padding: 10px 14px; border-radius: 14px; white-space: pre-wrap; }
.msg.ana { background: var(--surface); border: 1px solid var(--border); align-self: flex-start; border-bottom-left-radius: 4px; }
.msg.me { background: var(--accent); color: white; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg-tools { display: flex; gap: 4px; margin-top: 4px; }
.msg-tools button { border: none; background: none; cursor: pointer; color: var(--muted); font-size: .8rem; padding: 2px 6px; border-radius: 4px; }
.msg-tools button:hover { background: var(--surface-2); }
.fb { align-self: flex-end; max-width: 78%; font-size: .88rem; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); }
.fb.ok { border-color: transparent; background: var(--good-soft); color: var(--good); padding: 4px 12px; }
.fb.err { background: var(--warn-soft); border-color: transparent; }
.fb .corr { font-weight: 600; margin-bottom: 6px; }
.err-item { margin: 6px 0; }
.err-item s { color: var(--bad); }
.err-item b { color: var(--good); }
.composer { display: flex; gap: 8px; position: sticky; bottom: 0; background: var(--bg); padding: 10px 0; }
.composer textarea { min-height: 48px; height: 48px; }
.typing::after { content: "…"; animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: .2; } }

.lesson { line-height: 1.65; }
.lesson table { border-collapse: collapse; margin: 10px 0; }
.lesson th, .lesson td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.lesson th { background: var(--surface-2); }
.lesson h2 { margin-top: 26px; }
.lesson code { background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }

.speak { border: none; background: none; cursor: pointer; font-size: 1rem; padding: 0 4px; vertical-align: middle; }
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 18px; }
.tabs button { border: none; background: none; padding: 9px 14px; cursor: pointer; color: var(--muted); border-bottom: 2px solid transparent; }
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.notice { padding: 12px 14px; border-radius: 8px; background: var(--warn-soft); color: var(--text); margin-bottom: 16px; font-size: .9rem; }
.btn.primary .kbd { border-color: rgba(255,255,255,.5); color: rgba(255,255,255,.85); }
.kbd { font-size: .75rem; border: 1px solid var(--border); border-radius: 4px; padding: 0 5px; color: var(--muted); }
table.list { width: 100%; border-collapse: collapse; }
table.list td { padding: 7px 4px; border-bottom: 1px solid var(--border); }
.spinner { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  nav.side { position: static; height: auto; display: flex; flex-wrap: wrap; gap: 2px; padding: 10px; }
  .brand { width: 100%; padding-bottom: 8px; }
  .ai-status { display: none; }
  main { padding: 20px 16px 80px; }
  .msg, .fb { max-width: 92%; }
}