/* ===================== TEMA / VARIABLES ===================== */
:root {
  --bg: #f6f8fc;
  --bg-soft: #eef2f9;
  --card: #ffffff;
  --text: #0f1729;
  --text-soft: #5a6782;
  --border: #e2e8f2;
  --accent: #3a5bd9;
  --accent-soft: #e9edfc;
  --grid-line: rgba(15, 23, 41, .05);
  --shadow: 0 1px 2px rgba(15,23,41,.04), 0 14px 34px rgba(15,23,41,.07);
  --radius: 12px;
  --maxw: 1080px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0f1e;
    --bg-soft: #0f1626;
    --card: #121a2d;
    --text: #e7ecf6;
    --text-soft: #8b98b4;
    --border: #1e2942;
    --accent: #6d8bff;
    --accent-soft: #16203c;
    --grid-line: rgba(255, 255, 255, .05);
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 14px 34px rgba(0,0,0,.45);
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
::selection { background: color-mix(in srgb, var(--accent) 25%, transparent); }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
section { padding: 74px 0; }
h1, h2, h3 { font-family: var(--sans); font-weight: 700; letter-spacing: -.02em; }
h2 { font-size: 1.7rem; margin-bottom: 8px; }
.section-sub { color: var(--text-soft); margin-bottom: 34px; }

/* ===================== NAV ===================== */
header.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-family: var(--mono); font-weight: 600; font-size: 1rem; letter-spacing: -.02em; color: var(--text); }
.nav-links { display: flex; gap: 26px; }
.nav-links a { color: var(--text-soft); font-size: .92rem; }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
@media (max-width: 680px) { .nav-links { display: none; } }

/* ===================== HERO ===================== */
.hero { position: relative; overflow: hidden; padding: 86px 0 64px; }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: radial-gradient(ellipse 85% 75% at 50% 0%, #000 35%, transparent 100%);
          mask-image: radial-gradient(ellipse 85% 75% at 50% 0%, #000 35%, transparent 100%);
}
.hero::after {
  content: ""; position: absolute; z-index: 0; pointer-events: none;
  top: -140px; left: 50%; transform: translateX(-50%);
  width: 620px; height: 320px; border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 16%, transparent), transparent);
}
.hero-inner { position: relative; z-index: 1; display: flex; align-items: center; gap: 44px; }
@media (max-width: 760px) { .hero-inner { flex-direction: column; align-items: stretch; gap: 32px; } }
.hero-text { flex: 1; }
.hero h1 { font-size: clamp(2.1rem, 6vw, 3.1rem); line-height: 1.1; margin-bottom: 18px; letter-spacing: -.03em; }
.hero h1 span { color: var(--accent); }
.hero p.lead { font-size: 1.1rem; color: var(--text-soft); max-width: 540px; margin-bottom: 28px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 9px; font-weight: 600; font-size: .93rem;
  border: 1px solid var(--border); transition: transform .12s ease, box-shadow .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { box-shadow: 0 8px 22px color-mix(in srgb, var(--accent) 38%, transparent); }
.btn-ghost { background: var(--card); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* Visual "tech" del hero (ventana con curva de supervivencia) */
.hero-visual {
  flex-shrink: 0; width: 340px; max-width: 100%;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: var(--shadow); overflow: hidden;
}
.hv-head {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; border-bottom: 1px solid var(--border); background: var(--bg-soft);
}
.hv-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.hv-title { margin-left: 8px; font-family: var(--mono); font-size: .78rem; color: var(--text-soft); }
.hv-svg { display: block; width: 100%; height: auto; padding: 16px 12px 2px; }
.hv-svg text { font-family: var(--mono); }
.hv-foot { padding: 4px 14px 14px; font-family: var(--mono); font-size: .74rem; color: var(--text-soft); }

/* ===================== SECCIONES ===================== */
.soft-section { background: var(--bg-soft); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.about-text { max-width: 680px; }
.about-text p { color: var(--text-soft); }
.about-text p + p { margin-top: 14px; }

/* Cabeceras centradas en Sobre mí y Proyectos */
#sobre-mi h2, #sobre-mi .section-sub,
#proyectos h2, #proyectos .section-sub { text-align: center; }
#sobre-mi .about-text { margin-inline: auto; }

/* ===================== PROYECTOS ===================== */
.proj-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.proj-card {
  display: block; color: inherit;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.proj-card:hover {
  text-decoration: none; transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
}
.proj-tag { font-family: var(--mono); font-size: .75rem; color: var(--accent); letter-spacing: .02em; margin-bottom: 10px; }
.proj-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.proj-card p { color: var(--text-soft); font-size: .93rem; }
.proj-card p strong { color: var(--text); font-weight: 600; }
.proj-link { display: inline-block; margin-top: 14px; color: var(--accent); font-weight: 600; font-size: .9rem; }

/* ===================== CHIPS ===================== */
.chips { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.chip {
  font-family: var(--mono); font-size: .8rem; letter-spacing: -.01em;
  padding: 5px 11px; border-radius: 7px;
  background: var(--accent-soft); border: 1px solid var(--border); color: var(--accent);
}

/* ===================== CONTACTO ===================== */
.contact { text-align: center; }
.contact h2 { font-size: 2rem; }
.contact .section-sub { margin-bottom: 24px; }
.contact .cta-row { justify-content: center; }

/* ===================== FOOTER ===================== */
footer { border-top: 1px solid var(--border); padding: 30px 0; color: var(--text-soft); }
.foot-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.foot-inner span { font-family: var(--mono); font-size: .8rem; }