:root{
  --bg:#0b1220;
  --bg2:#070f1c;

  --text:#e6eef3;
  --muted:#a8b3bf;

  --accent:#22d3ee;
  --accent-ink:#042027;

  /* azul de CTAs (hover de Ver proyectos) */
  --cta-blue: #38bdf8;
  --cta-blue-ink: #ffffff;

  --link:#60a5fa;
  --link-hover:#93c5fd;

  --card: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.10);
  --shadow: 0 10px 26px rgba(2,6,23,0.55);

  --radius:16px;
  --container: 1040px;

  --focus: 0 0 0 3px rgba(34,211,238,0.35);

  /* Contact section (light blue background) */
  --contact-bg: rgba(56, 189, 248, 0.16);
  --contact-border: rgba(56, 189, 248, 0.25);
  --contact-text: #0b1220;
  --contact-muted: rgba(11,18,32,0.72);
  --contact-link: #0b4a6f;

  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

*{box-sizing:border-box}
html,body{height:100%}

body{
  margin:0;
  background: linear-gradient(180deg,var(--bg2) 0%, var(--bg) 100%);
  color:var(--text);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

.container{max-width:var(--container);margin:0 auto;padding:26px}

a{
  color: var(--link);
  text-decoration: none;
  text-underline-offset: 6px;
  text-decoration-thickness: 2px;
}
a:hover{
  color: var(--link-hover);
  text-decoration: underline;
}
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:none;
  box-shadow: var(--focus);
  border-radius: 12px;
}

.skip-link{
  position:absolute;
  left:-999px;
  top:10px;
  background: var(--accent);
  color:var(--accent-ink);
  padding:10px 12px;
  border-radius: 12px;
  z-index: 999;
}
.skip-link:focus{left:10px}

.site-header{
  border-bottom:1px solid var(--border);
  background: rgba(11,18,32,0.65);
  position:sticky;
  top:0;
  z-index:10;
  backdrop-filter: blur(10px);
}

.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 12px;
}

.brand-title{
  margin:0;
  font-size:1.05rem;
  font-weight: 850;
  letter-spacing: 0.2px;
}
.brand-sub{margin:0;color:var(--muted);font-size:0.95rem}

.header-actions{display:flex;gap:10px;align-items:center}

.icon-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:46px;
  height:46px;
  border-radius: 14px;
  border:1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor:pointer;
}

.hamburger-lines{width:18px;height:2px;background: currentColor;position:relative;display:block;border-radius: 2px;}
.hamburger-lines::before,
.hamburger-lines::after{content:"";width:18px;height:2px;background: currentColor;position:absolute;left:0;border-radius: 2px;}
.hamburger-lines::before{top:-6px}
.hamburger-lines::after{top:6px}

.main-nav{display:flex;align-items:center;gap: 14px;}
.main-nav a{color: var(--muted);font-weight:800;}
.main-nav a:hover{ color: var(--text); }

/* Contacto (botón del menú): fondo azul, texto gris en reposo */
.btn-primary{
  background: var(--cta-blue);
  color: var(--cta-blue-ink);
  padding:12px 16px;
  border-radius:14px;
  text-decoration:none;
  border:1px solid transparent;
  cursor:pointer;
  font-weight: 900;
}

/* gris más oscuro (menos blanco) SOLO en el botón Contacto del menú */
.main-nav .btn-primary{
  color: rgba(230, 238, 243, 0.82);
}
.main-nav .btn-primary:hover{
  color: #ffffff;
}

.btn-primary:hover{
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 2px;
}

.hero{padding:64px 0 36px}
.hero-inner{display:grid;grid-template-columns:1fr 320px;gap:34px;align-items:start;}
.hero-text h1{margin:0 0 12px 0;font-size: 2.2rem;line-height: 1.15;letter-spacing: -0.02em;}
.lead{margin: 0 0 10px 0;font-size: 1.06rem;}
.muted{color:var(--muted)}

.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0 0;}

/* Botones hero: borde azul + relleno azul solo hover */
.btn,
.btn-outline{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 18px;
  border-radius:14px;
  font-weight:900;
  text-decoration:none;
  background: transparent;
  border:1px solid var(--cta-blue);
  color: var(--text);
}
.btn-hover-fill:hover{
  background: var(--cta-blue);
  border-color: var(--cta-blue);
  color: var(--cta-blue-ink);
  text-decoration: none;
}

.social{margin-top:16px;display:flex;flex-wrap:wrap;align-items:center;gap: 10px;}
.icon-link{
  display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius: 999px;
  border: 1px solid var(--border);background: rgba(255,255,255,0.03);color: var(--text);
}
.icon-link:hover{background: rgba(255,255,255,0.06);}

.hero-image img{width:100%;height:auto;border-radius: 22px;box-shadow: var(--shadow);border: 1px solid var(--border);}

.section{padding:32px 0}
h2{margin: 0 0 14px 0;font-size: 1.5rem;letter-spacing: -0.01em;}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.045), rgba(0,0,0,0.06));
  padding:20px;border-radius:var(--radius);border:1px solid var(--border);box-shadow: var(--shadow);
}

.grid{display:grid;gap:18px}
.projects-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.project-card h3{margin-top:0}

.project-links a{font-weight:850;}

.list{ margin: 0; padding-left: 18px; }
.list li{ margin: 8px 0; }

.tags{list-style:none;padding:0;margin: 12px 0 0;display:flex;flex-wrap:wrap;gap:8px;}
.tags li{border:1px solid var(--border);color: var(--muted);padding: 6px 10px;border-radius: 999px;font-size: 0.85rem;font-weight: 850;}

.skills-grid{margin-top: 14px;display: grid;gap: 22px;}
.skills-title{margin: 0 0 10px 0;font-size: 1.15rem;letter-spacing: -0.01em;}
.skills-block{border-top: 1px solid var(--border);padding-top: 24px;margin-top: 18px;}
.chips{list-style: none;padding: 0;margin: 0;display:flex;flex-wrap:wrap;gap: 12px;}
.chips li{padding: 12px 16px;border-radius: 999px;font-weight: 800;font-size: 0.98rem;}
.chips-purple li{
  background: rgba(167, 139, 250, 0.14);
  border: 1px solid rgba(167, 139, 250, 0.30);
  color: #e9d5ff;
}
.chips-green li{background: rgba(34,197,94,0.14);border: 1px solid rgba(34,197,94,0.30);color: #a7f3d0;}

.two-col{ grid-template-columns: repeat(2, minmax(0, 1fr)); }

.publications-grid{grid-template-columns: 1fr;}
.publication-card--vertical{display:grid;grid-template-columns: 1fr;gap: 16px;}
.publication-media img{width:100%;height:auto;border-radius: 14px;border: 1px solid var(--border);display:block;}
.publication-links a{font-weight:850;}

.timeline{position: relative;margin-top: 10px;padding-left: 18px;}
.timeline::before{content:"";position:absolute;left: 6px;top: 4px;bottom: 4px;width: 2px;background: rgba(56,189,248,0.35);border-radius: 2px;}
.timeline-item{position: relative;display: grid;grid-template-columns: 14px 1fr;gap: 12px;padding: 10px 0;}
.timeline-dot{width: 12px;height: 12px;border-radius: 999px;background: var(--cta-blue);box-shadow: 0 0 0 3px rgba(56,189,248,0.18);margin-top: 4px;}

.contact-grid{grid-template-columns:1fr 340px}
.contact-form label{display:block;margin-top:12px;font-weight:900}
.contact-form input,.contact-form textarea{width:100%;padding:12px;margin-top:8px;border-radius:14px;border:1px solid var(--border);background: transparent;color:var(--text)}

.site-footer{border-top:1px solid var(--border);padding:22px 0;margin-top:34px;text-align:center;color:var(--muted);font-size:0.98rem}

.scroll-top{
  position: fixed;right: 18px;bottom: 18px;width: 46px;height: 46px;display: inline-flex;align-items: center;justify-content: center;
  border-radius: 999px;border: 1px solid var(--border);background: rgba(11,18,32,0.75);color: var(--text);box-shadow: var(--shadow);
  opacity: 0;pointer-events: none;transform: translateY(6px);transition: opacity .2s ease, transform .2s ease, background .2s ease;
}
.scroll-top:hover{ background: rgba(255,255,255,0.06); }
.scroll-top.is-visible{ opacity: 1; pointer-events: auto; transform: translateY(0); }

.nav-overlay{position: fixed;inset: 0;background: rgba(0,0,0,0.45);}

/* Contact section base */
.section-contact{
  background: var(--contact-bg);
  border-top: 1px solid var(--contact-border);
  border-bottom: 1px solid var(--contact-border);
}

/* Título de Contacto en blanco (porque dices que el fondo es oscuro) */
section#contacto.section.section-contact h2{
  color: #ffffff !important;
}

/* dentro de contacto mantenemos reglas de lectura */
.section-contact h3{
  color: var(--contact-text);
}
.section-contact .muted{
  color: var(--contact-muted);
}
.section-contact a{
  color: var(--contact-link);
}
.section-contact a:hover{
  color: #083a57;
}
.section-contact .card{
  background: rgba(255,255,255,0.78);
  border-color: rgba(11,18,32,0.10);
  box-shadow: 0 12px 24px rgba(2,6,23,0.16);
}
.section-contact .contact-form input,
.section-contact .contact-form textarea{
  border-color: rgba(11,18,32,0.18);
  background: rgba(255,255,255,0.85);
  color: var(--contact-text);
}
.section-contact .contact-form label{
  color: var(--contact-text);
}
.section-contact .btn-primary{
  background: var(--cta-blue);
  color: #fff;
}

/* FORCE (por si algo pisa el fondo) */
section#contacto.section.section-contact{
  background: var(--contact-bg) !important;
}

@media (max-width:900px){
  .container{padding:22px}
  .hero-inner{grid-template-columns:1fr}
  .two-col{grid-template-columns: 1fr}
  .contact-grid{grid-template-columns:1fr}

  .main-nav{
    position: fixed;right: 16px;top: 78px;width: min(360px, calc(100vw - 32px));
    display: none;flex-direction: column;align-items: stretch;gap: 10px;padding: 14px;
    background: var(--bg);border: 1px solid var(--border);border-radius: 18px;box-shadow: var(--shadow);
  }
  .main-nav a{padding: 12px 12px;border-radius: 14px;background: rgba(255,255,255,0.03);}
  .main-nav .btn-primary{display:inline-flex;justify-content:center;}

  body.nav-open .main-nav{display:flex}
  body.nav-open #nav-overlay{display:block}
}

/* FORCE: menú Contacto texto gris y hover blanco */
nav#main-nav a.btn-primary{
  color: rgba(230, 238, 243, 0.82) !important;
}
nav#main-nav a.btn-primary:hover{
  color: #ffffff !important;
}

/* FORCE: título Contacto final en blanco */
section#contacto h2#contacto-title{
  color: #ffffff !important;
}