:root {
  --bg: #f6f3ea;
  --surface: #fffdf7;
  --surface-2: #efe9db;
  --ink: #1c2233;
  --ink-soft: #5a6274;
  --line: #ddd5c3;
  --blue: #2f6aa3;
  --blue-deep: #1f4f7f;
  --yellow: #f5c518;
  --yellow-soft: #fff2b8;
  --green: #2e9b5f;
  --green-soft: #dcf3e5;
  --red: #c8423b;
  --red-soft: #fbe2df;
  --code-bg: #1d2333;
  --code-ink: #e8ecf5;
  --shadow: 0 1px 0 var(--line), 0 8px 24px -14px rgba(28, 34, 51, 0.35);
  --radius: 14px;
  --font-display: "Bricolage Grotesque", system-ui, sans-serif;
  --font-body: "Figtree", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151f;
    --surface: #1a1f2d;
    --surface-2: #232a3b;
    --ink: #eef0f6;
    --ink-soft: #9aa3b8;
    --line: #2d3549;
    --blue: #6fa8e0;
    --blue-deep: #9cc4ee;
    --yellow: #f5c518;
    --yellow-soft: #3a3214;
    --green: #53c487;
    --green-soft: #173525;
    --red: #ef7d76;
    --red-soft: #3d1d1c;
    --code-bg: #0e111a;
    --shadow: 0 1px 0 var(--line), 0 10px 28px -16px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; letter-spacing: -0.01em; }
a { color: var(--blue); }
/* Sem ligaduras: um principiante tem de ver `==` e `!=` tal como os escreve. */
code, pre, textarea, .CodeMirror { font-family: var(--font-mono); font-variant-ligatures: none; font-feature-settings: "liga" 0, "calt" 0; }
button { font: inherit; }
[hidden] { display: none !important; }

/* ---------- Barra de topo ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 24px;
  padding: 10px max(16px, calc((100vw - 1200px) / 2));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-family: var(--font-display); font-size: 1.25rem; }
.brand b { color: var(--blue); font-weight: 800; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--yellow); font-size: 1.2rem; }
.topnav { display: flex; gap: 4px; }
.topnav a { padding: 6px 12px; border-radius: 999px; text-decoration: none; color: var(--ink-soft); font-weight: 600; }
.topnav a.active, .topnav a:hover { background: var(--surface-2); color: var(--ink); }
.hud { margin-left: auto; display: flex; align-items: center; gap: 14px; }
.hud-streak { font-weight: 700; white-space: nowrap; }
.hud-streak.off { opacity: 0.45; filter: grayscale(1); }
.hud-level { display: flex; align-items: center; gap: 8px; }
.hud-level .lvl { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 800; font-family: var(--font-display); }
.hud-level .xpbar { width: 110px; }
.hud-user { display: flex; align-items: center; gap: 8px; color: var(--ink-soft); font-weight: 600; }

.xpbar { height: 8px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.xpbar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--yellow), #ffb200); border-radius: inherit; transition: width .6s cubic-bezier(.2,.8,.2,1); }
.small { font-size: .85rem; color: var(--ink-soft); }

/* ---------- Layout ---------- */
.view { max-width: 1200px; margin: 0 auto; padding: 28px 16px 80px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.grid { display: grid; gap: 16px; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; font-weight: 700; color: var(--ink-soft); }

.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 10px 18px; border-radius: 10px; border: 1px solid transparent;
  font-weight: 700; cursor: pointer; text-decoration: none;
  transition: transform .08s ease, background .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--blue); color: #fff; box-shadow: 0 3px 0 var(--blue-deep); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn-yellow { background: var(--yellow); color: #1c2233; box-shadow: 0 3px 0 #c99d00; }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { background: var(--surface-2); }

/* ---------- Autenticação ---------- */
.auth { min-height: calc(100vh - 120px); display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
.auth-hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); margin: 0 0 16px; }
.auth-hero h1 em { font-style: normal; background: linear-gradient(transparent 60%, var(--yellow) 60%); }
.auth-hero p { font-size: 1.15rem; color: var(--ink-soft); max-width: 46ch; }
.auth-points { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; }
.auth-points li { display: flex; gap: 10px; align-items: center; font-weight: 600; }
.auth-points li span { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: var(--surface-2); }
.auth-form { display: grid; gap: 14px; max-width: 420px; width: 100%; justify-self: end; padding: 28px; }
.auth-form h2 { margin: 0; }
label { display: grid; gap: 6px; font-weight: 600; font-size: .92rem; }
input[type=text], input[type=password], textarea {
  font: inherit; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink);
}
input:focus, textarea:focus { outline: 2px solid var(--blue); outline-offset: 1px; }
.form-error { color: var(--red); font-weight: 600; min-height: 1.4em; margin: 0; }

/* ---------- Painel ---------- */
.hello { display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.hello h1 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.6rem); }
.stats { grid-template-columns: repeat(4, 1fr); margin-bottom: 28px; }
.stat { display: grid; gap: 4px; }
.stat .num { font-family: var(--font-display); font-size: 2rem; font-weight: 800; line-height: 1; }
.stat .icon { font-size: 1.4rem; }
.dash { grid-template-columns: 2fr 1fr; align-items: start; }
.section-title { display: flex; justify-content: space-between; align-items: baseline; margin: 0 0 12px; }
.section-title h2 { margin: 0; font-size: 1.35rem; }

.modules { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.module-card { display: grid; gap: 10px; text-decoration: none; color: inherit; transition: transform .15s ease, border-color .15s ease; }
.module-card:hover { transform: translateY(-3px); border-color: var(--blue); }
.module-card .top { display: flex; justify-content: space-between; align-items: center; }
.module-card .emoji { font-size: 1.8rem; }
.module-card h3 { margin: 0; font-size: 1.2rem; }
.module-card p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.module-card .progress { height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.module-card .progress span { display: block; height: 100%; background: var(--green); }
.pill { font-size: .78rem; font-weight: 700; padding: 3px 9px; border-radius: 999px; background: var(--surface-2); color: var(--ink-soft); white-space: nowrap; }
.pill.done { background: var(--green-soft); color: var(--green); }

.badges { grid-template-columns: repeat(auto-fill, minmax(84px, 1fr)); gap: 10px; }
.badge { text-align: center; padding: 10px 6px; border-radius: 12px; background: var(--surface-2); font-size: .74rem; font-weight: 600; line-height: 1.25; }
.badge .b-icon { display: block; font-size: 1.8rem; margin-bottom: 4px; }
.badge.locked { opacity: .4; filter: grayscale(1); }

.board { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.board li { display: grid; grid-template-columns: 26px 1fr auto; gap: 8px; align-items: center; padding: 6px 8px; border-radius: 8px; }
.board li.me { background: var(--yellow-soft); font-weight: 700; }
.board .pos { font-family: var(--font-display); font-weight: 800; color: var(--ink-soft); }

/* ---------- Lição ---------- */
.crumbs { font-size: .9rem; color: var(--ink-soft); margin-bottom: 12px; }
.crumbs a { color: var(--ink-soft); }
.lesson-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; gap: 24px; }
.lesson { padding: 8px 36px 28px; }
.lesson h1 { font-size: 2.2rem; }
.lesson h2 { margin-top: 1.8em; font-size: 1.45rem; }
.lesson table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: .95rem; }
.lesson th, .lesson td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.lesson th { background: var(--surface-2); }
.lesson blockquote { margin: 16px 0; padding: 10px 16px; border-left: 4px solid var(--yellow); background: var(--yellow-soft); border-radius: 0 10px 10px 0; }
.lesson blockquote p { margin: 0; }
.prose :not(pre) > code { background: var(--surface-2); padding: 2px 6px; border-radius: 6px; font-size: .88em; }
.prose pre { background: var(--code-bg); color: var(--code-ink); padding: 14px 16px; border-radius: 12px; overflow-x: auto; font-size: .9rem; line-height: 1.5; }
.side { position: sticky; top: 80px; display: grid; gap: 16px; }
.ex-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.ex-list a { display: grid; grid-template-columns: 28px 1fr auto; gap: 10px; align-items: center; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); text-decoration: none; color: var(--ink); background: var(--bg); }
.ex-list a:hover { border-color: var(--blue); }
.ex-list .check { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; border: 2px solid var(--line); font-size: .8rem; }
.ex-list .done .check { background: var(--green); border-color: var(--green); color: #fff; }
.stars { color: var(--yellow); letter-spacing: 1px; font-size: .85rem; }

/* ---------- Exercício ---------- */
.ex-layout { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 20px; align-items: start; }
.ex-head { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.ex-head h1 { margin: 0; font-size: 1.8rem; flex-basis: 100%; }
.statement { margin-top: 8px; }
.hint { margin-top: 14px; padding: 12px 14px; border-radius: 10px; background: var(--yellow-soft); }
.tests { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.test { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; font-size: .88rem; background: var(--bg); }
.test.pass { border-color: var(--green); background: var(--green-soft); }
.test.fail { border-color: var(--red); background: var(--red-soft); }
.test .t-head { display: flex; justify-content: space-between; font-weight: 700; }
.test pre { margin: 6px 0 0; white-space: pre-wrap; font-size: .82rem; background: transparent; color: inherit; padding: 0; }
.test .t-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.test .t-label { font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); font-weight: 700; margin-top: 6px; }

.editor-card { padding: 0; overflow: hidden; }
.editor-bar { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--line); background: var(--surface-2); flex-wrap: wrap; }
.editor-bar .file { font-family: var(--font-mono); font-size: .85rem; color: var(--ink-soft); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.py-status { font-size: .8rem; color: var(--ink-soft); display: flex; align-items: center; gap: 6px; }
.py-status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--yellow); }
.py-status.ready::before { background: var(--green); }
.py-status.error::before { background: var(--red); }

.CodeMirror { height: 340px; font-family: var(--font-mono); font-size: 14.5px; background: var(--code-bg); color: var(--code-ink); }
.CodeMirror-gutters { background: var(--code-bg); border-right: 1px solid #2b3347; }
.CodeMirror-linenumber { color: #5d6782; }
.CodeMirror-cursor { border-left: 2px solid var(--yellow); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: #33405e !important; }
/* Prefixo .CodeMirror para ganhar ao tema por omissão (.cm-s-default .cm-*). */
.CodeMirror .cm-keyword { color: #ff9e64; font-weight: 600; }
.CodeMirror .cm-builtin { color: #7dcfff; }
.CodeMirror .cm-string { color: #c3e88d; }
.CodeMirror .cm-number { color: #f5c518; }
.CodeMirror .cm-comment { color: #6b7590; font-style: italic; }
.CodeMirror .cm-def { color: #82aaff; }
.CodeMirror .cm-variable, .CodeMirror .cm-variable-2, .CodeMirror .cm-property { color: #e8ecf5; }
.CodeMirror .cm-operator, .CodeMirror .cm-punctuation, .CodeMirror .cm-bracket { color: #89ddff; }
.CodeMirror .cm-error { color: #ff7a85; background: transparent; }
.CodeMirror-matchingbracket { color: #f5c518 !important; }

.io { display: grid; grid-template-columns: 1fr 2fr; border-top: 1px solid var(--line); }
.io > div { padding: 10px 12px; display: grid; gap: 6px; align-content: start; }
.io > div + div { border-left: 1px solid var(--line); }
.io textarea { font-family: var(--font-mono); font-size: .85rem; min-height: 90px; resize: vertical; }
.console { margin: 0; font-family: var(--font-mono); font-size: .85rem; white-space: pre-wrap; min-height: 90px; max-height: 220px; overflow: auto; background: var(--bg); border-radius: 10px; padding: 10px 12px; border: 1px solid var(--line); }
.console .err { color: var(--red); }

.feedback { margin-top: 16px; display: grid; gap: 10px; }
.verdict { display: flex; gap: 14px; align-items: center; padding: 14px 16px; border-radius: 12px; font-weight: 700; }
.verdict .big { font-size: 1.8rem; }
.verdict.ok { background: var(--green-soft); color: var(--green); }
.verdict.ko { background: var(--red-soft); color: var(--red); }
.verdict p { margin: 0; color: var(--ink); font-weight: 500; }
.ai-box { border-left: 4px solid var(--blue); }
.ai-box h3 { margin: 0 0 6px; font-size: 1rem; display: flex; gap: 8px; align-items: center; }
.ai-box .score { margin-left: auto; font-family: var(--font-display); font-size: 1.3rem; color: var(--blue); }
.ai-box ul { margin: 8px 0 0; padding-left: 20px; }
.thinking { display: flex; align-items: center; gap: 10px; color: var(--ink-soft); }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--blue); animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Toasts / celebrações ---------- */
.toasts { position: fixed; right: 16px; bottom: 16px; display: grid; gap: 10px; z-index: 50; max-width: min(360px, calc(100vw - 32px)); }
.toast { display: flex; gap: 12px; align-items: center; padding: 12px 16px; border-radius: 12px; background: var(--ink); color: var(--bg); box-shadow: 0 12px 30px -10px rgba(0,0,0,.5); animation: pop .35s cubic-bezier(.2,1.4,.4,1); font-weight: 600; }
.toast .t-icon { font-size: 1.7rem; }
.toast small { display: block; font-weight: 400; opacity: .8; }
@keyframes pop { from { transform: translateY(20px) scale(.9); opacity: 0; } }
.burst { position: fixed; pointer-events: none; font-size: 1.6rem; z-index: 60; animation: burst 1.1s ease-out forwards; }
@keyframes burst { to { transform: translate(var(--dx), var(--dy)) rotate(var(--rot)); opacity: 0; } }

.empty { text-align: center; padding: 40px; color: var(--ink-soft); }

/* ---------- Responsivo ---------- */
@media (max-width: 900px) {
  .auth, .dash, .lesson-layout, .ex-layout { grid-template-columns: 1fr; }
  .auth-form { justify-self: stretch; max-width: none; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .side { position: static; }
  .lesson { padding: 4px 18px 20px; }
  .hud-level .xpbar, .hud-user span { display: none; }
  .topnav a { padding: 6px 8px; }
  .topbar { gap: 12px; }
  .brand > span:last-child { display: none; }
  .io { grid-template-columns: 1fr; }
  .io > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .test .t-cols { grid-template-columns: 1fr; }
}