:root {
  --brand: #004080;
  --brand-2: #083A6E;
  --brand-dark: #001f3f;
  --accent: #1ca9c9;
  --text: #111;
  --bg: #f4f4f4;
  --radius: 8px;
  --shadow: 0 2px 6px rgba(0,0,0,0.1);
  --content-max: 1200px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: 'Segoe UI', system-ui, -apple-system, Roboto, 'Helvetica Neue', Arial, sans-serif; background-color: var(--bg); color: var(--text); line-height: 1.6; }

/* Medios fluidos */
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }

/* Foco accesible */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Tipografía fluida */
h1 { font-size: clamp(1.8rem, 2.4rem + 1vw, 3rem); }
h2 { font-size: clamp(1.3rem, 1.2rem + 0.6vw, 2rem); }
h3 { font-size: clamp(1.05rem, 1rem + 0.4vw, 1.25rem); }

/* ==========================
   Header & Nav
   ========================== */
header { background-color: #fff; padding: 0.75rem clamp(1rem, 3vw, 2rem); display: flex; align-items: center; justify-content: space-between; border-bottom: 3px solid var(--brand); }
.logo img { height: clamp(52px, 8vw, 120px); }

/* Desktop nav */
nav ul { list-style: none; display: flex; gap: clamp(0.5rem, 1.2vw, 1.5rem); flex-wrap: wrap; }
nav ul li a { text-decoration: none; color: var(--brand); font-weight: 700; padding: 0.5rem 0.75rem; border-radius: 6px; }
nav ul li a:hover, nav ul li a:focus-visible { background-color: rgba(0, 64, 128, 0.08); }

/* Botón hamburguesa (oculto en desktop) */
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.nav-toggle{display:none;align-items:center;justify-content:center;gap:.5rem;padding:.5rem .6rem;border:0;background:#fff;border-radius:8px;box-shadow:0 1px 3px rgba(0,0,0,.08);cursor:pointer}
.nav-toggle-box{display:inline-flex;flex-direction:column;gap:4px}
.nav-toggle-bar{display:block;width:22px;height:2px;background:#003566;border-radius:2px;transition:transform .25s ease,opacity .25s ease}
/* Estado animado (X) */
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ==========================
   Hero
   ========================== */
#hero { position: relative; color: #fff; background-image: url('img/santiago.jpg'); background-size: cover; background-position: center; height: 100vh; display: flex; align-items: center; opacity: 0; transform: translateY(50px); transition: opacity 1s ease, transform 1s ease; padding: 3rem clamp(1rem, 3vw, 2rem); }
@supports (height: 100dvh) { #hero { height: 100dvh; } }
#hero.visible { opacity: 1; transform: translateY(0); }
.hero-text { background-color: rgba(0, 53, 102, 0.85); padding: clamp(1.25rem, 3vw, 3rem); margin-left: min(5%, 40px); border-radius: var(--radius); max-width: min(560px, 95%); text-align: left; }
.hero-text h1 { margin-bottom: 0.75rem; font-weight: 700; transition: transform 0.3s ease; }
.hero-text h1:hover { transform: scale(1.03); }
.hero-text p { font-size: clamp(1rem, 0.95rem + 0.3vw, 1.1rem); color: #fff; margin-bottom: 1.25rem; }
.hero-button { padding: 12px 20px; font-size: 1rem; background: #fff; color: #003566; border: none; border-radius: 6px; cursor: pointer; transition: background-color 0.25s ease, color 0.25s ease; }
.hero-button:hover { background: var(--brand-dark); color: #fff; }
@media (max-width: 600px) { #hero { padding: 2.25rem 1rem; } .hero-text { margin-left: 0; } }

/* ==========================
   Áreas de práctica
   ========================== */
#areas { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2.5vw, 2rem); align-items: center; padding: clamp(2rem, 4vw, 3rem) clamp(1rem, 3vw, 2rem); background-color: #fff; }
.areas-img { grid-column: span 6; }
.areas-text { grid-column: span 6; }
.areas-img img { width: 100%; max-width: 720px; margin-inline: auto; border-radius: 4px; box-shadow: var(--shadow); }
.areas-text h2 { color: var(--brand-2); margin-bottom: 1rem; }
.areas-text ul { list-style: none; padding-left: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.9rem 1rem; }
.areas-text li { position: relative; padding-left: 1.2rem; color: #003366; font-weight: 600; }
.areas-text li::before { content: ""; position: absolute; left: 0; top: 0.65em; width: 8px; height: 8px; background-color: var(--accent); border-radius: 50%; }

/* ==========================
   Visión
   ========================== */
#vision { background-color: var(--brand-2); color: #fff; text-align: center; padding: clamp(2rem, 4vw, 3rem) clamp(1rem, 3vw, 2rem); }
#vision p { max-width: 75ch; margin-inline: auto; }

/* ==========================
   Equipo
   ========================== */
#equipo { padding: clamp(2rem, 4vw, 3rem) clamp(1rem, 3vw, 2rem); background-color: #ecf2f8; text-align: center; }
.equipo-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: clamp(1rem, 2.5vw, 2rem); justify-items: center; align-items: start; }
.miembro { background-color: #fff; padding: 1rem; width: 100%; max-width: 280px; border-radius: var(--radius); box-shadow: var(--shadow); }
.miembro img { width: 100%; border-radius: 4px; }

/* ==========================
   Contacto
   ========================== */
#contacto { background-color: var(--brand-2); color: #fff; padding: clamp(2rem, 4vw, 3rem) clamp(1rem, 3vw, 2rem); }
.contacto-contenido { display: grid; grid-template-columns: repeat(12, 1fr); gap: clamp(1rem, 2.5vw, 2rem); }
.direccion { grid-column: span 6; }
#contactForm { grid-column: span 6; }
#contactForm { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
#contactForm input, #contactForm textarea { padding: 0.75rem; font-size: 1rem; border: none; border-radius: 4px; width: 100%; }
#contactForm textarea { grid-column: 1 / -1; min-height: 140px; resize: vertical; }
#contactForm button { grid-column: 1 / -1; background-color: var(--brand); color: #fff; padding: 0.75rem; border: none; cursor: pointer; font-weight: 800; border-radius: 4px; }
#contactForm button:hover { background-color: #0066cc; }

/* ==========================
   Footer
   ========================== */
footer { background-color: var(--brand-dark); color: #fff; text-align: center; padding: 1.5rem clamp(1rem, 3vw, 2rem); }
footer .social img { width: 24px; margin-top: 0.5rem; }

/* ==========================
   Responsiveness – Breakpoints
   ========================== */
/* Laptops/Desktops medianos */
@media (max-width: 1200px) { :root { --content-max: 1040px; } }

/* Tablets landscape / desktops pequeños */
@media (max-width: 992px) { .areas-text ul { grid-template-columns: 1fr; } }

/* Tablets portrait / móviles grandes */
@media (max-width: 768px) {
  /* Header sticky en móviles */
  header{ position: sticky; top: 0; z-index: 30; background: #fff; }

  /* Mostrar botón hamburguesa */
  .nav-toggle{display:inline-flex}

  /* Ocultar lista por defecto y preparar slide */
  header nav ul{ display:flex; flex-direction:column; gap:.25rem; overflow:hidden; height:0; transition:height .28s ease; will-change:height }

  /* Contenedor del menú desplegable */
  header nav{ position:absolute; left:0; right:0; top:100%; background:#fff; border-bottom:3px solid #004080; box-shadow:0 4px 10px rgba(0,0,0,.08); padding:.5rem 1rem }

  /* Links: más área táctil */
  nav ul li a{ display:block; padding:.75rem .5rem }

  /* Layouts de secciones */
  #areas { grid-template-columns: 1fr; }
  .areas-img, .areas-text { grid-column: 1 / -1; }
  .contacto-contenido { grid-template-columns: 1fr; }
  .direccion, #contactForm { grid-column: 1 / -1; }
  #contactForm { grid-template-columns: 1fr; }
}

/* Fallback: si JS no carga, muestra menú */
@media (max-width:768px){ html:not(.js) header nav ul{ height: auto; } }

/* Móviles medianos */
@media (max-width: 560px) { header { padding-block: 0.5rem; } nav ul { gap: 0.35rem; } .hero-text { padding: 1rem 1.1rem; } }

/* Móviles pequeños */
@media (max-width: 400px) { .logo img { height: 48px; } .miembro { max-width: 100%; } }

/* ==========================
   Accesibilidad / DX
   ========================== */
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } html { scroll-behavior: auto; } }
@supports (padding: max(0px)) { header, #hero, #areas, #vision, #equipo, #contacto, footer { padding-left: max(env(safe-area-inset-left), 1rem); padding-right: max(env(safe-area-inset-right), 1rem); } }

/* Bloquear scroll al abrir menú */
body.menu-open { overflow: hidden; }

/* Overlay para click-away */
.menu-overlay{ position: fixed; inset: 0; background: rgba(0,0,0,.35); opacity: 0; pointer-events: none; transition: opacity .2s ease; z-index: 15; }
body.menu-open .menu-overlay{ opacity: 1; pointer-events: auto; }