/* Física Teórica I — UCM — hoja de estilos moderna */

:root {
  --color-primary: #7a0019;      /* granate UCM */
  --color-primary-dark: #56000f;
  --color-accent: #c9a227;       /* dorado */
  --color-bg: #ffffff;
  --color-bg-alt: #f7f5f2;
  --color-text: #1f1f1f;
  --color-text-muted: #5a5a5a;
  --color-border: #e3ddd3;
  --radius: 10px;
  --max-width: 1100px;
  --header-height: 76px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg-alt);
  line-height: 1.55;
}

img { max-width: 100%; height: auto; display: block; }

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

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

.site-header__bar {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
}

.site-header__logo {
  height: 52px;
  width: auto;
  border-radius: 6px;
  background: #fff;
  padding: 2px;
}

.site-header__title {
  flex: 1;
  min-width: 0;
}

.site-header__title h1 {
  font-size: clamp(1rem, 2.6vw, 1.5rem);
  margin: 0;
  line-height: 1.2;
}

.site-header__title small {
  display: block;
  font-weight: 400;
  opacity: .85;
  font-size: .75rem;
}

.site-header__logo--right { margin-left: auto; }

.lang-switch {
  display: flex;
  gap: 4px;
  margin-left: 8px;
}

.lang-switch button {
  border: 1px solid rgba(255,255,255,.5);
  background: transparent;
  color: #fff;
  border-radius: 20px;
  padding: 5px 12px;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s;
}

.lang-switch button[aria-pressed="true"] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #2b2205;
}

.lang-switch button:hover { background: rgba(255,255,255,.2); }
.lang-switch button[aria-pressed="true"]:hover { background: var(--color-accent); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
}

/* ---------- Nav ---------- */

.site-nav {
  background: var(--color-primary-dark);
}

.site-nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
}

.site-nav > .site-nav__inner > ul { flex: 1; }

.site-nav li { position: relative; }

.site-nav a, .site-nav .nav-label {
  display: block;
  color: #f2ede4;
  text-decoration: none;
  padding: 12px 14px;
  font-size: .92rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
}

.site-nav a:hover, .site-nav .nav-label:hover { background: rgba(255,255,255,.08); color: #fff; }

.site-nav a.actual { background: var(--color-accent); color: #2b2205; }

.site-nav .has-children > ul {
  display: none;
  position: absolute;
  left: 0;
  top: 100%;
  background: #fff;
  min-width: 260px;
  box-shadow: 0 8px 20px rgba(0,0,0,.2);
  border-radius: 0 0 var(--radius) var(--radius);
  overflow: hidden;
  z-index: 50;
}

.site-nav .has-children > ul a,
.site-nav .has-children > ul .nav-label {
  color: var(--color-text);
  white-space: normal;
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}

.site-nav .has-children > ul a:hover { background: var(--color-bg-alt); }

@media (hover: hover) {
  .site-nav .has-children:hover > ul { display: block; }
}

.site-nav .has-children.open > ul { display: block; }

/* Mobile nav */
@media (max-width: 860px) {
  .nav-toggle { display: inline-block; }

  .site-nav__inner { display: block; }

  .site-nav ul { flex-direction: column; }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    transition: max-height .25s ease;
  }
  .site-nav.open { max-height: 1400px; }

  .site-nav .has-children > ul {
    position: static;
    box-shadow: none;
    border-radius: 0;
    background: rgba(0,0,0,.15);
  }
  .site-nav .has-children > ul a,
  .site-nav .has-children > ul .nav-label {
    color: #f2ede4;
    padding-left: 30px;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .site-nav .has-children > ul a:hover { background: rgba(255,255,255,.1); }
}

/* ---------- Layout ---------- */

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
}

main {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: clamp(16px, 4vw, 40px);
  margin: 24px auto;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}

main h1:first-child, main h2:first-child { margin-top: 0; }

main h1 { font-size: clamp(1.4rem, 3vw, 2rem); color: var(--color-primary-dark); }
main h2 { font-size: clamp(1.15rem, 2.4vw, 1.4rem); color: var(--color-primary-dark); margin-top: 2em;}

.lead { font-size: 1.08rem; color: var(--color-text-muted); }

[hidden] { display: none !important; }

/* Home hero */
.hero {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 28px;
  align-items: center;
}
@media (max-width: 700px) {
  .hero { grid-template-columns: 1fr; }
}

.hero-slideshow {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  aspect-ratio: 4/3;
}
.hero-slideshow img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
  opacity: 0;
  transition: opacity 1s ease;
}
.hero-slideshow img.is-active { opacity: 1; }

.callout-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 20px 0 8px;
}
@media (max-width: 560px) { .callout-cards { grid-template-columns: 1fr; } }

.callout-card {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  background: var(--color-bg-alt);
  text-decoration: none;
  color: var(--color-text);
  transition: box-shadow .15s, transform .15s;
}
.callout-card:hover { box-shadow: 0 4px 14px rgba(0,0,0,.08); transform: translateY(-2px); }
.callout-card img { width: 52px; height: 52px; object-fit: contain; flex: none; }
.callout-card strong { display: block; color: var(--color-primary-dark); }

/* Tables (staff listings etc.) */
.data-table-wrap { overflow-x: auto; margin: 1em 0; }
table.data-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 480px;
  font-size: .95rem;
}
table.data-table caption {
  text-align: left;
  font-weight: 700;
  color: var(--color-primary-dark);
  padding: 10px 4px;
  font-size: 1.05rem;
}
table.data-table th, table.data-table td {
  border: 1px solid var(--color-border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
table.data-table th { background: var(--color-bg-alt); }
table.data-table tr.section-row td {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  text-align: center;
}

.conf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 18px;
  margin: 1.2em 0;
}
.conf-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-bg-alt);
  transition: box-shadow .15s, transform .15s;
}
.conf-card:hover { box-shadow: 0 6px 18px rgba(0,0,0,.1); transform: translateY(-2px); }
.conf-card img { width: 100%; height: 120px; object-fit: contain; background: #fff; padding: 10px; }
.conf-card__body { padding: 10px 12px; }
.conf-card__body strong { display: block; color: var(--color-primary-dark); margin-bottom: 4px; }
.conf-card__body span { font-size: .85rem; color: var(--color-text-muted); }

.subject-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
@media (max-width: 700px) { .subject-columns { grid-template-columns: 1fr; } }
.subject-columns h3 { color: var(--color-primary-dark); border-bottom: 2px solid var(--color-accent); padding-bottom: 4px;}
.subject-columns details { margin-bottom: 8px; border: 1px solid var(--color-border); border-radius: 8px; padding: 6px 10px;}
.subject-columns summary { cursor: pointer; font-weight: 600; }
.subject-columns ul { margin: 6px 0 4px 18px; }

.badge-note {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  padding: 10px 14px;
  border-radius: 6px;
  font-size: .92rem;
}

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

.site-footer {
  text-align: center;
  color: var(--color-text-muted);
  font-size: .85rem;
  padding: 20px 16px 40px;
}