/* styles/main.css
   Estilos globales para Tresnio — moderno, accesible y responsive
   Variables CSS para theming y fácil modificación.
*/

:root{
  --bg: #071028;
  --panel: #0f1724;
  --muted: #9aa6b2;
  --accent: #7c3aed;
  --text: #e6eef6;
  --surface: rgba(255,255,255,0.02);
  --radius: 12px;
  --container-width: 1120px;
  --max-width: 1200px;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color-scheme: dark;
}

/* reset básico */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.45;
  font-size:16px;
}

/* contenedor central */
.container{
  width:90%;
  max-width:var(--container-width);
  margin:0 auto;
  padding:28px 0;
}

/* enlace para salto (accesibilidad) */
.skip-link{
  position:absolute;
  left:-999px;
  top:auto;
  width:1px;height:1px;overflow:hidden;
}
.skip-link:focus{
  left:1rem;top:1rem;width:auto;height:auto;padding:8px 12px;background:#fff;color:#000;border-radius:6px;z-index:9999;
}

/* HEADER */
.site-header{
  border-bottom:1px solid rgba(255,255,255,0.03);
  background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
  position:sticky;
  top:0;
  z-index:900;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand-title{font-family:"Playfair Display",serif;font-size:22px;margin:0;color:var(--text)}
.brand-tag{margin:0;color:var(--muted);font-size:12px}

/* NAV */
.site-nav .nav-list{list-style:none;margin:0;padding:0;display:flex;gap:20px;align-items:center}
.site-nav a{color:var(--muted);text-decoration:none;font-weight:500;padding:8px;border-radius:8px}
.site-nav a:hover, .site-nav a:focus{color:var(--text);background:rgba(255,255,255,0.02)}

/* HERO */
.hero{padding:36px 0}
.hero-grid{display:grid;grid-template-columns:1fr 420px;gap:28px;align-items:start}
.hero-left .lead{color:var(--muted);margin-top:8px}
.card{border-radius:var(--radius);padding:18px;border:1px solid var(--surface);background:linear-gradient(180deg, rgba(255,255,255,0.01), transparent)}
.card-exo h3{margin:0 0 6px 0}
.cta{display:inline-block;margin-top:12px;padding:10px 16px;border-radius:10px;border:2px solid var(--accent);cursor:pointer;color:var(--text)}

/* DUAL COLUMNS */
.dual-columns{display:grid;grid-template-columns:1fr 420px;gap:28px;padding:28px 0}
.card-grid{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px}
.mini-card{width:150px;padding:12px;border-radius:8px;border:1px solid var(--surface);background:transparent}

/* PROJECTS */
.project-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:18px 0}
.project-tile{padding:18px;border-radius:10px;border:1px solid var(--surface)}

/* BLOG */
.blog{display:grid;grid-template-columns:1fr 320px;gap:20px;padding:28px 0}
.post{padding:14px;border:1px solid var(--surface);border-radius:8px;margin-bottom:12px}

/* FOOTER */
.site-footer{border-top:1px solid rgba(255,255,255,0.03);padding:18px 0;margin-top:28px}
.footer-inner{display:flex;justify-content:space-between;align-items:center}
.footer-inner a{color:var(--muted);text-decoration:none}

/* Helpers */
.muted{color:var(--muted)}
.small{font-size:13px;color:var(--muted)}
.icon{display:inline-block;width:28px;height:28px;border-radius:6px;border:1px solid var(--surface);margin-left:8px}

/* responsive */
@media (max-width:980px){
  .hero-grid, .dual-columns, .blog{grid-template-columns:1fr}
  .project-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  .project-grid{grid-template-columns:1fr}
  .site-nav .nav-list{gap:10px;flex-wrap:wrap}
  .brand-title{font-size:18px}
}