/* Welton Ferreira Nunes Junior - CSS */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', Arial, sans-serif; background: #f9f9f9; color: #222; line-height: 1.75; }
a { color: #212121; text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  background: linear-gradient(135deg, #212121, #424242);
  color: #fff; padding: 3rem 1.5rem 2rem;
  text-align: center;
}
header h1 { font-size: 2.4rem; font-weight: 800; letter-spacing: -.5px; margin-bottom: .5rem; }
header p { font-size: 1.1rem; opacity: .9; }

nav {
  background: #212121; display: flex; flex-wrap: wrap;
  justify-content: center; gap: .25rem; padding: .6rem 1rem;
}
nav a { color: #fff; padding: .45rem 1.1rem; border-radius: 4px; font-size: .95rem; transition: background .2s; }
nav a:hover { background: rgba(255,255,255,.2); text-decoration: none; }

.container { max-width: 900px; margin: 2rem auto; padding: 0 1.5rem; }

.intro { background: #fff; border-left: 5px solid #212121; padding: 1.5rem 2rem; border-radius: 0 8px 8px 0; margin-bottom: 2rem; box-shadow: 0 2px 8px rgba(0,0,0,.07); }
.intro h2 { color: #212121; margin-bottom: .8rem; font-size: 1.35rem; }

.paper, .artigo { background: #fff; border-radius: 8px; padding: 1.75rem; margin-bottom: 1.5rem; box-shadow: 0 2px 10px rgba(0,0,0,.08); border-top: 4px solid #212121; }
.paper h2, .artigo h2 { color: #212121; font-size: 1.25rem; margin-bottom: .6rem; }
.paper .meta, .artigo .meta { font-size: .85rem; color: #888; margin-bottom: .8rem; }
.paper p, .artigo p { color: #444; }
.paper a { display: inline-block; margin-top: 1rem; background: #212121; color: #fff; padding: .45rem 1.2rem; border-radius: 4px; font-size: .9rem; }
.paper a:hover { opacity: .85; text-decoration: none; }

.faq-section { margin-top: 2.5rem; }
.faq-section h2 { color: #212121; font-size: 1.4rem; margin-bottom: 1.2rem; }
.faq-item { background: #fff; border-radius: 8px; padding: 1.25rem 1.5rem; margin-bottom: 1rem; box-shadow: 0 1px 6px rgba(0,0,0,.07); border-left: 4px solid #424242; }
.faq-item h3 { color: #212121; font-size: 1rem; margin-bottom: .5rem; }
.faq-item p { color: #555; font-size: .95rem; }

.sobre-section { background: #f5f5f5; border-radius: 10px; padding: 2rem; margin: 2rem 0; }
.sobre-section h2 { color: #212121; margin-bottom: 1rem; }

.breadcrumb { font-size: .85rem; color: #999; margin-bottom: 1.5rem; }
.breadcrumb a { color: #212121; }

.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.tag { background: #f5f5f5; color: #212121; padding: .25rem .75rem; border-radius: 20px; font-size: .8rem; font-weight: 600; }

footer {
  background: #212121; color: rgba(255,255,255,.85);
  text-align: center; padding: 2rem 1rem; margin-top: 3rem;
  font-size: .9rem; line-height: 1.9;
}
footer a { color: rgba(255,255,255,.7); }
footer strong { color: #fff; }

@media(max-width:600px) {
  header h1 { font-size: 1.7rem; }
  .container { padding: 0 1rem; }
}