/* Estilo compartilhado das páginas de aula (Conteúdo / Exercícios / Desafios).
   Referenciado por todos os módulos via caminho relativo "../../assets/lesson.css". */
:root{
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-alt: #eef1f8;
  --border: #dfe3ee;
  --text: #1b1f2a;
  --text-muted: #57607a;
  --accent: #0468d7;
  --accent-soft: #e6f0fd;
  --code-bg: #1b2333;
  --code-text: #e6e9f2;
  --code-comment: #7c88a8;
  --code-string: #8bd17c;
  --code-keyword: #6ab5ff;
  --code-number: #f4b869;
  --shadow: 0 1px 2px rgba(20,25,40,.06), 0 8px 24px rgba(20,25,40,.05);
}
@media (prefers-color-scheme: dark){
  :root{
    --bg: #11151f;
    --surface: #171c29;
    --surface-alt: #1e2433;
    --border: #2a3142;
    --text: #e8eaf2;
    --text-muted: #9aa3bd;
    --accent: #5aa9ff;
    --accent-soft: #1c2a41;
    --code-bg: #0d111b;
    --code-text: #e6e9f2;
    --code-comment: #6b768f;
    --code-string: #8bd17c;
    --code-keyword: #7cb8ff;
    --code-number: #f4b869;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  }
}
*{ box-sizing: border-box; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
.page{
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}
header.hero{ margin-bottom: 2rem; }
.eyebrow{
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .75rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 .6rem;
}
h1{
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  margin: 0 0 .5rem;
  letter-spacing: -.01em;
}
.lede{
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 60ch;
  margin: 0 0 1.4rem;
}
nav.trail{ display: flex; flex-wrap: wrap; gap: .5rem; }
nav.trail a, nav.trail span{
  font-size: .85rem;
  padding: .35rem .75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text-muted);
}
nav.trail .current{
  background: var(--accent-soft);
  color: var(--accent);
  border-color: transparent;
  font-weight: 600;
}
nav.trail a:hover{ border-color: var(--accent); color: var(--accent); }
section{ margin: 2.4rem 0; }
h2{
  font-size: 1.25rem;
  margin: 0 0 .9rem;
  display: flex;
  align-items: center;
  gap: .5rem;
}
h2 .num{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: .8rem;
  font-weight: 700;
  flex: 0 0 auto;
}
h3{ font-size: 1.05rem; margin: 0 0 .5rem; }
p{ margin: 0 0 .8rem; }
.kicker{
  display: inline-block;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: .25rem .6rem;
  border-radius: 8px;
  margin-bottom: .6rem;
}
.card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem 1.3rem;
  box-shadow: var(--shadow);
}
.concepts{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: .8rem;
}
.concept{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .9rem 1rem;
}
.concept code{
  background: var(--surface-alt);
  padding: .1rem .4rem;
  border-radius: 6px;
  font-size: .85rem;
}
.concept p{ margin: .4rem 0 0; color: var(--text-muted); font-size: .92rem; }
pre.code{
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 14px;
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  font-size: .88rem;
  box-shadow: var(--shadow);
  margin: 0 0 .8rem;
}
pre.code code{
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  white-space: pre;
}
.tok-comment{ color: var(--code-comment); font-style: italic; }
.tok-string{ color: var(--code-string); }
.tok-keyword{ color: var(--code-keyword); }
.tok-number{ color: var(--code-number); }
pre.output, pre.run{
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.2rem;
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
  font-size: .88rem;
  color: var(--text);
  overflow-x: auto;
  margin: 0 0 .8rem;
}
pre.run{ color: var(--accent); }
pre.run::before{ content: "$ "; opacity: .6; }
.practice-grid{ display: grid; gap: .8rem; }
.practice{
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .2rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
}
.practice .kind{
  grid-row: span 2;
  align-self: center;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: .3rem .6rem;
  border-radius: 8px;
  white-space: nowrap;
}
.practice .file{ font-family: "SF Mono", "Menlo", "Consolas", monospace; font-size: .85rem; color: var(--text); }
.practice .desc{ margin: 0; color: var(--text-muted); font-size: .92rem; }
.exercise{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.4rem 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.4rem;
}
.exercise + .exercise{ margin-top: 0; }
ul.checklist{ list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
ul.checklist li{ display: flex; gap: .6rem; align-items: flex-start; color: var(--text); }
ul.checklist li::before{
  content: "";
  flex: 0 0 auto;
  width: 1.05rem;
  height: 1.05rem;
  margin-top: .15rem;
  border-radius: 5px;
  border: 1.5px solid var(--border);
}
footer{
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: .88rem;
  display: grid;
  gap: .3rem;
}
footer a{ color: var(--accent); }