/* ==========================================================================
   Sitio de Carlos A. Delgado — hoja de estilos compartida
   Paleta académica (rojo Harvard) sobre neutros cálidos, con modo oscuro.
   ========================================================================== */

:root {
  color-scheme: light dark;
  --bg: #faf8f6;
  --bg-soft: #f1ede8;
  --surface: #ffffff;
  --border: #e7e0d8;
  --fg: #1c1a18;
  --muted: #6c6560;
  --accent: #a51c30;
  --accent-strong: #7f1526;
  --accent-soft: rgba(165, 28, 48, 0.10);
  --shadow: 0 12px 34px rgba(35, 22, 15, 0.09);
  --shadow-sm: 0 4px 14px rgba(35, 22, 15, 0.07);
  --radius: 16px;
  --maxw: 860px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14110f;
    --bg-soft: #1c1815;
    --surface: #1e1a17;
    --border: #322b26;
    --fg: #efe9e2;
    --muted: #a89f96;
    --accent: #e46079;
    --accent-strong: #f07f93;
    --accent-soft: rgba(228, 96, 121, 0.14);
    --shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
    --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ------------------------------- Hero ----------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1200px 400px at 80% -10%, var(--accent-soft), transparent 70%),
    linear-gradient(160deg, var(--bg-soft), var(--bg));
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3.2rem 1.25rem 2.6rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.monogram {
  flex: 0 0 auto;
  width: 84px;
  height: 84px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  background: linear-gradient(150deg, var(--accent), var(--accent-strong));
  box-shadow: var(--shadow-sm);
}

.hero h1 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.7rem, 4.5vw, 2.4rem);
  letter-spacing: -0.015em;
  line-height: 1.15;
}

.hero .tagline {
  margin: 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 2.4vw, 1.08rem);
  max-width: 46ch;
}

/* ------------------------------ Social ---------------------------------- */

.social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.social a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color 0.15s ease, transform 0.15s ease, color 0.15s ease;
}

.social a:hover,
.social a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  outline: none;
}

/* --------------------------- Tarjetas (home) ---------------------------- */

section.enlaces {
  padding: 2.6rem 0 1rem;
}

.grid-cards {
  display: grid;
  gap: 1rem;
}

a.tarjeta {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 1.3rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

a.tarjeta:hover,
a.tarjeta:focus-visible {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  outline: none;
}

.tarjeta .icono {
  flex: 0 0 auto;
  width: 50px;
  height: 50px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background: var(--accent-soft);
  font-size: 1.6rem;
  line-height: 1;
}

.tarjeta .texto { flex: 1 1 auto; min-width: 0; }

.tarjeta .titulo {
  display: block;
  font-weight: 650;
  font-size: 1.1rem;
}

.tarjeta .sub {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
}

.tarjeta .flecha {
  flex: 0 0 auto;
  color: var(--accent);
  font-size: 1.35rem;
  transition: transform 0.16s ease;
}

a.tarjeta:hover .flecha { transform: translateX(4px); }

/* Tarjeta destacada del canal de YouTube */
a.tarjeta.youtube {
  background: linear-gradient(135deg, #ff2740 0%, #c40000 100%);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 12px 30px rgba(196, 0, 0, 0.28);
}

a.tarjeta.youtube:hover,
a.tarjeta.youtube:focus-visible {
  border-color: transparent;
  box-shadow: 0 18px 44px rgba(196, 0, 0, 0.38);
}

a.tarjeta.youtube .icono {
  background: rgba(255, 255, 255, 0.20);
  color: #fff;
}

a.tarjeta.youtube .sub { color: rgba(255, 255, 255, 0.88); }
a.tarjeta.youtube .flecha { color: #fff; }

a.tarjeta.youtube .badge {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.05rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  vertical-align: middle;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
}

/* ------------------------- Página de trayectoria ------------------------ */

.topbar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1rem 1.25rem 0;
}

.volver {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--muted);
}

.volver:hover { color: var(--accent); }

main.doc { padding: 2rem 0 3rem; }

.doc section { margin-bottom: 2.6rem; }

.doc h2 {
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
  margin: 0 0 1.1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.perfil p { margin: 0 0 0.8rem; color: var(--fg); }

/* pastillas de habilidades / idiomas */
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.chip {
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--fg);
}

.dos-columnas {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
}

.dos-columnas h3 {
  font-size: 0.95rem;
  margin: 0 0 0.7rem;
}

/* Timeline de experiencia y formación */
.timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
  border-left: 2px solid var(--border);
}

.timeline > li {
  position: relative;
  padding: 0 0 1.6rem 0.4rem;
}

.timeline > li::before {
  content: "";
  position: absolute;
  left: calc(-1.5rem - 1px);
  top: 0.45rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
  transform: translateX(-5px);
}

.timeline .cargo {
  font-weight: 650;
  font-size: 1.02rem;
}

.timeline .org { color: var(--fg); }

.timeline .meta {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  margin: 0.1rem 0 0.4rem;
}

.timeline ul {
  margin: 0.3rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.94rem;
}

.timeline ul li { margin-bottom: 0.2rem; }

/* Publicaciones */
.pubs { margin: 0; padding: 0; list-style: none; }

.pubs li {
  padding: 0.9rem 1.1rem;
  margin-bottom: 0.8rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  font-size: 0.94rem;
}

.pubs .titulo-pub { font-style: italic; }
.pubs .fuente { color: var(--muted); }

/* Certificaciones */
.certs { display: grid; gap: 0.8rem; grid-template-columns: 1fr 1fr; }

.cert {
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.cert strong { display: block; }
.cert .emisor { color: var(--muted); font-size: 0.86rem; }

/* ------------------------- Proyectos (portafolio) ----------------------- */

.proyectos {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
}

.proj {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.proj:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.proj-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.proj-head .nombre { font-weight: 650; font-size: 1.05rem; }

.proj .lang {
  flex: 0 0 auto;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  white-space: nowrap;
}

.proj .desc { color: var(--fg); font-size: 0.92rem; margin: 0; }
.proj .highlight { color: var(--muted); font-size: 0.85rem; margin: 0; }

.proj .repo-link {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}
.proj .repo-link:hover { text-decoration: underline; }

.card-links {
  margin-top: auto;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  align-items: center;
}
.card-links .repo-link { margin-top: 0; }

.demo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  padding: 0.22rem 0.7rem;
  border-radius: 999px;
}
.demo-link:hover { filter: brightness(1.08); }

/* ------------------------------ Footer ---------------------------------- */

footer.pie {
  border-top: 1px solid var(--border);
  padding: 1.6rem 1.25rem 2.4rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

footer.pie a { color: var(--muted); text-decoration: none; }
footer.pie a:hover { color: var(--accent); }

/* ---------------------------- Responsivo -------------------------------- */

@media (max-width: 560px) {
  .hero-inner { padding-top: 2.4rem; }
  .dos-columnas { grid-template-columns: 1fr; }
  .certs { grid-template-columns: 1fr; }
  .proyectos { grid-template-columns: 1fr; }
  .tarjeta .flecha { display: none; }
}