/*
  Estilos base para o portfólio responsivo
  Breakpoints:
  -- Desktop: ≥ 1024px
  -- Tablet:  640–1023px
  -- Mobile:  < 640px
*/

:root{
  --bg: #ffffff;
  --text: #0b0b0b;
  --muted: #6b7280; /* cinza */
  --link: #1d4ed8; /* azul */
  --border: #e5e7eb; /* cinza claro */
  --brand: #111827;
  --radius: 12px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--link);text-decoration:none}
a:hover{ text-decoration:underline }

.container{
  width:min(1200px, 92%);
  margin-inline:auto;
}
.small{font-size:.9rem}
.muted{color:var(--muted)}

.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{left:16px;top:16px;width:auto;height:auto;padding:8px 12px;background:#fff;border:1px solid var(--border);border-radius:8px;z-index:999}

/* Header */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid var(--border);z-index:50}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0}
.brand{font-weight:700;color:var(--brand)}

.site-nav ul{display:flex;gap:24px;list-style:none;margin:0;padding:0}
.site-nav a{color:var(--text)}

/* Botão hamburger */
.nav-toggle{display:none;flex-direction:column;gap:4px;background:none;border:0;padding:8px;border-radius:8px}
.nav-toggle:focus{outline:2px solid var(--link);outline-offset:2px}
.nav-toggle .bar{width:24px;height:2px;background:var(--text);display:block}

/* Layout principal */
.layout{display:grid;grid-template-columns:360px 1fr;gap:48px;padding:40px 0}
.intro h1{font-size:2.2rem;line-height:1.1;margin:0 0 12px}
.intro p{margin:0 0 12px}
.reference img{border:1px solid var(--border);border-radius:8px}

.posts .posts-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.card{border-top:1px solid var(--border);padding-top:16px}
.card .tag{font-size:.8rem;color:var(--muted)}
.card h3{margin:.3rem 0 .6rem;font-size:1.25rem}
.card .media{margin:10px 0;border-radius:var(--radius);overflow:hidden}
.card p{margin:0 0 10px}
.card .more{font-weight:500}

/* Footer */
.site-footer{border-top:1px solid var(--border);margin-top:56px}
.footer-inner{padding:24px 0}
.footer-inner .links{display:flex;gap:24px;list-style:none;margin:12px 0;padding:0}

/* Tablet: 640–1023px */
@media (max-width: 1023px){
  .layout{grid-template-columns: 1fr;gap:32px}
  .intro{order:0}
  .posts{order:1}
  .posts .posts-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-nav{display:none}
  .nav-toggle{display:flex}
  .site-header.open #menu{display:block}
  .site-header.open .site-nav ul{flex-direction:column;gap:12px;padding:12px 0}
  .site-header.open .site-nav{display:block;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border)}
  .header-inner{position:relative}
}

/* Mobile: < 640px */
@media (max-width: 639px){
  .intro h1{font-size:1.6rem}
  .container{width:min(620px, 92%)}
  .posts .posts-grid{grid-template-columns:1fr}
}