:root{
  /* Paleta y variables */
  --max-width: 1200px;
  --bg-start: #f8fafc;
  --bg-end: #e6f0f3;
  --primary: #2a4d69;       /* azul oscuro */
  --primary-600: #213b52;
  --accent: #ff7a59;        /* acento cálido */
  --muted: #7a869a;
  --card-bg: #ffffff;
  --nav-bg: linear-gradient(120deg, rgba(42,77,105,0.98), rgba(33,59,82,0.95));
  --nav-text: #ffffff;
  --nav-hover: rgba(255,255,255,0.08);
  --radius: 12px;
  --gap: 1rem;

  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  box-sizing: border-box;
}

/* Global reset & layout */
*,
*::before,
*::after { box-sizing: inherit; }
html,body{height:100%;margin:0;background: linear-gradient(120deg, var(--bg-start) 0%, var(--bg-end) 100%);color:#222e36}
.contenedor-principal{
  max-width:var(--max-width);
  margin:32px auto;
  padding:24px 20px;
  background: linear-gradient(180deg, rgba(255,255,255,0.88), rgba(255,255,255,0.95));
  border-radius: 14px;
  box-shadow: 0 8px 30px rgba(15,30,45,0.06);
}

/* Header + Navigation */
.site-header{
  display:flex;
  flex-direction:column;
  gap:.6rem;
  margin-bottom: 1rem;
  align-items: center;
}

/* Principal title: use Tangerine (ensure link to Google Fonts in HTML) */
h1{
  font-family: "Tangerine", serif;
  font-size: clamp(40px, 6vw, 64px);
  text-align:center;
  font-weight:700;
  letter-spacing:2px;
  color:var(--primary);
  margin: 0.6rem 0 0.2rem 0;
  text-shadow: 1px 2px 6px rgba(179,198,214,0.7);
}

/* Elegant navigation bar */
.nav-wrap{
  width:100%;
  border-radius: 0 0 18px 18px;
  box-shadow: 0 6px 20px rgba(33,59,82,0.08);
  overflow:visible;
  background: var(--nav-bg);
  padding: 10px 14px;
  display:flex;
  justify-content:center;
  align-items:center;
}

/* Use <nav class="main-nav"> with an inner ul */
.main-nav ul{
  list-style:none;
  padding:0;
  margin:0;
  display:flex;
  gap: 18px;
  align-items:center;
  justify-content:center;
  flex-wrap:wrap;
}

/* Nav links styled as pills */
.main-nav a{
  display:inline-block;
  color:var(--nav-text);
  text-decoration:none;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  font-weight:600;
  font-size: 1rem;
  transition: transform .12s ease, background .12s ease, box-shadow .12s ease;
  border: 1px solid rgba(255,255,255,0.06);
  background: transparent;
}

/* Hover / focus states */
.main-nav a:hover,
.main-nav a:focus{
  background: var(--nav-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(15,30,45,0.08);
  outline: none;
}

/* Active/current link */
.main-nav a.active,
.main-nav a[aria-current="page"]{
  background: #fff;
  color: var(--primary-600);
  box-shadow: 0 8px 22px rgba(33,59,82,0.12);
  transform: none;
}

/* Decorative underline animation */
.main-nav a::after{
  content: "";
  display:block;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  border-radius: 3px;
  margin-top: 6px;
  transition: width .18s ease;
}
.main-nav a:hover::after,
.main-nav a:focus::after{ width: 60%; }

/* Photo styling (id="photo") */
#photo{
  width: clamp(120px, 12vw, 220px);
  height: auto;
  border-radius: 50%;
  border: 4px solid rgba(179,198,214,0.7);
  box-shadow: 0 8px 30px rgba(42,77,105,0.12);
  display:block;
  margin: 1.25rem auto;
  object-fit: cover;
}

/* Subtitle */
.subtitle{
  color: #4f5d75;
  text-transform: uppercase;
  font-size: 1.05rem;
  letter-spacing: 1.5px;
  text-align: center;
  margin: 0.6rem 0 1.2rem 0;
  font-weight:600;
}

/* Cards / sections */
section{
  background: var(--card-bg);
  border-radius: 10px;
  margin-bottom: 24px;
  padding: 20px 18px;
  box-shadow: 0 6px 18px rgba(15,30,45,0.04);
  border: 1px solid rgba(15,30,45,0.03);
}

/* Section headings */
section h2, section h3{
  color: var(--primary);
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-weight:700;
  letter-spacing: 0.8px;
}

/* Lists inside sections */
section ul{
  padding-left: 1.2rem;
  color: #222e36;
  font-size: 1.02rem;
  margin: 0.2rem 0;
}

/* Buttons */
button, .btn{
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  font-weight:700;
  cursor: pointer;
  transition: background .16s ease, transform .08s ease, box-shadow .12s ease;
  box-shadow: 0 8px 20px rgba(33,59,82,0.08);
}
button:hover, .btn:hover{
  background: var(--primary-600);
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(33,59,82,0.12);
}

/* Form styling (as requested) */
.contact-form{
  display:grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  max-width: 540px;
  margin: 0.6rem auto 0 auto;
}
.contact-form label{
  font-weight:600;
  color:var(--primary);
  margin-bottom: 0.25rem;
  display:block;
}
.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea,
.contact-form select{
  width:100%;
  padding: 0.65rem 0.8rem;
  border-radius:8px;
  border: 1px solid rgba(33,59,82,0.08);
  background: #fbfdff;
  font-size: 0.98rem;
  color: #16202a;
  resize: vertical;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.6);
}
.contact-form textarea{ min-height:120px; }

/* References grid (3 columns) */
#references{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
#references > h2{
  grid-column: 1 / -1;
  text-align:center;
}

/* Alternative flex variant */
#references.flex{ display:flex; flex-direction:column; gap:1rem; }

/* Projects table (responsive grid-like rows) */
.projects-table{ width:100%; border-collapse:collapse; margin-top:8px; }
.projects-header, .projects-row{
  display:grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 12px;
  padding: .7rem .6rem;
  border-bottom: 1px solid rgba(33,59,82,0.04);
  align-items: center;
}
.projects-header{ font-weight:700; color:var(--primary); background: linear-gradient(90deg, rgba(255,255,255,0.6), rgba(250,250,250,0.6)); }

/* Iframe responsive container */
.iframe-container{ position:relative; width:100%; padding-top:56.25%; overflow:hidden; border-radius:10px; }
.iframe-container iframe{ position:absolute; top:0; left:0; width:100%; height:100%; border:0; }

/* Footer */
.site-footer{ padding:.75rem 0; text-align:center; color:var(--muted); font-size:0.95rem; margin-top: 8px; }

/* Accessibility: skip link */
.skip-link{ position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden; }
.skip-link:focus{ position:relative; left:0; top:0; width:auto; height:auto; padding:.5rem .75rem; background:#000; color:#fff; z-index:9999; border-radius:6px; }

/* Focus-visible improved */
:focus-visible{ outline: 3px solid rgba(42,77,105,0.12); outline-offset: 3px; border-radius:6px; }

/* Responsive rules */
@media (max-width: 900px){
  .main-nav ul{ gap:12px; justify-content:flex-start; overflow:auto; -webkit-overflow-scrolling:touch; padding: 6px 4px; }
  .projects-header, .projects-row{ grid-template-columns: 1fr; gap:8px; }
  #references{ grid-template-columns: 1fr 1fr; }
  .contenedor-principal{ padding:20px 16px; }
}

@media (max-width: 520px){
  .site-header{ gap:.45rem; }
  h1{ font-size: clamp(32px, 10vw, 48px); }
  .main-nav ul{ flex-direction:column; gap:8px; background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent); padding:10px; border-radius:10px; }
  .profile-photo, #photo{ width:150px; height:150px; }
  #references{ grid-template-columns: 1fr; }
  .skills-list{ columns:1; }
}

/* Small visual tweaks for print */
@media print{
  .nav-wrap, .site-header{ box-shadow:none; background:transparent; }
  .contenedor-principal{ box-shadow:none; background: #fff; }
}