/* ===== Tokens e resets ===== */
:root{
  --bg: #0b0c10;
  --fg: #e6e6e6;
  --muted: #a8adb3;
  --card: #14161a;
  --border: #242830;
  --accent: #2dd4bf; /* teal */
}

@media (prefers-color-scheme: light){
  :root{
    --bg: #ffffff;
    --fg: #0f172a;
    --muted: #475569;
    --card: #f8fafc;
    --border: #e2e8f0;
    --accent: #0ea5e9; /* azul */
  }
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 16px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a{ color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible{ text-decoration: underline; outline: none; }

img{ max-width: 100%; height: auto; display: block; }

.container{
  width: min(960px, 100% - 2rem);
  margin-inline: auto;
}

/* ===== Header / Nav ===== */
.site-header{
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; backdrop-filter: blur(6px);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  z-index: 10;
}
.header-grid{
  display: grid; gap: 1rem; align-items: center;
  grid-template-columns: auto 1fr auto;
  padding: 1rem 0.5rem;
}
.avatar{
  width: 72px; height: 72px; border-radius: 50%;
  border: 2px solid var(--border); object-fit: cover;
}
.title{ margin: 0; font-size: 1.5rem; }
.subtitle{ margin: .25rem 0 0; color: var(--muted); font-size: .95rem; }

.site-nav a{
  padding: .5rem .75rem; border-radius: 999px;
  border: 1px solid transparent;
}
.site-nav a:hover, .site-nav a:focus-visible{
  background: var(--card); border-color: var(--border);
}

/* ===== Conteúdo ===== */
.lead{ margin: 2rem 0; font-size: 1.05rem; color: var(--muted); }

h2 {
  font-size: 1.4rem;
  margin: 2rem 0 1rem;
  position: relative;
  padding-left: 1rem;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 60%;
  background-color: var(--accent);
  border-radius: 3px;
}
h3{ font-size: 1.1rem; margin: 1.5rem 0 .5rem; }

.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, 1fr); /* Sempre duas colunas */
  margin-bottom: 1rem;
}
.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover, .card:focus-within{
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,.15);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
}
.card h4{ margin: 0 0 .25rem; font-size: 1.05rem; }
.card p{ margin: 0 0 .75rem; color: var(--muted); }

.btn{
  display: inline-block;
  padding: .55rem .9rem;
  border-radius: 10px;
  background: var(--accent);
  color: #000;
  font-weight: 600;
  border: 0;
}
.btn:focus-visible{ outline: 2px solid #000; outline-offset: 2px; }

/* Listas de links (outras turmas) */
.link-list{ margin: .5rem 0 1.5rem; padding-left: 1.25rem; }
.link-list li{ margin: .35rem 0; }

/* ===== Footer ===== */
.site-footer{
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}
.footer-grid{
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 0.5rem; color: var(--muted);
}
.footer-grid .email{ color: var(--fg); }

/* ===== Utilidades ===== */
@media (max-width: 640px){
  .header-grid{ grid-template-columns: auto 1fr; }
  .site-nav{ grid-column: 1 / -1; display: flex; gap: .25rem; flex-wrap: wrap; }
}

.links {
    display: flex;
    gap: 2rem; /* Espaçamento horizontal entre os links */
    justify-content: center; /* Centraliza os links */
    margin-top: 1rem;
    flex-wrap: wrap; /* Mantém responsivo em telas pequenas */
}

.links a {
    display: flex;
    align-items: center;
    gap: 0.5rem; /* Espaço entre o ícone e o texto */
    text-decoration: none;
    font-size: 1.2rem; /* Tamanho do texto */
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 10px;
    background-color: var(--accent);
    color: #000;
    transition: background 0.3s ease, transform 0.2s ease;
}

.links a:hover {
    background-color: color-mix(in srgb, var(--accent) 85%, #000);
    transform: translateY(-2px);
}

.links i {
    font-size: 2rem; /* Ícones maiores */
}