/* ==========================================================================
   Hoja de estilos única — Página personal académica de Pablo Borrego Ramos
   Sin frameworks, sin fuentes externas: solo fuentes del sistema.
   ========================================================================== */

/* Variables de diseño (Componente 2 del diseño) */
:root {
  --color-text: #1a1a2e;
  --color-accent: #0b5394;     /* enlaces, acentos */
  --color-muted: #6b7280;
  --color-bg: #ffffff;
  --color-border: #e5e7eb;
  --max-width: 46rem;          /* ancho de columna de lectura */
  --font-body: Georgia, 'Times New Roman', serif;
  --font-ui: system-ui, sans-serif;
}

:root[data-theme="dark"] {
  --color-text: #e5e7eb;
  --color-accent: #7ab3e0;
  --color-muted: #9ca3af;
  --color-bg: #15151f;
  --color-border: #33334a;
}

/* Base ------------------------------------------------------------------- */
* {
  box-sizing: border-box;
}

html {
  font-size: 100%;
}

body {
  margin: 0;
  padding: 0 1.25rem;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
}

/* Columna única centrada con ancho máximo de lectura */
.site-header,
main,
.site-footer {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

h1, h2, h3 {
  font-family: var(--font-body);
  line-height: 1.25;
  margin: 1.5em 0 0.5em;
}

h1 { font-size: 1.75rem; margin-top: 0.75em; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover,
a:focus {
  text-decoration-thickness: 2px;
}

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

/* Cabecera y navegación --------------------------------------------------- */
.site-header {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--font-ui);
  font-size: 0.95rem;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  color: var(--color-muted);
  cursor: pointer;
  padding: 0.35rem 0.5rem;
  display: inline-flex;
  align-items: center;
}

.theme-toggle:hover,
.theme-toggle:focus {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* Show sun in dark mode, moon in light mode */
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.site-header nav a {
  color: var(--color-text);
  text-decoration: none;
}

.site-header nav a:hover,
.site-header nav a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}

.site-header nav a.active {
  color: var(--color-accent);
  font-weight: 600;
  border-bottom: 2px solid var(--color-accent);
}

/* Enlaces discretos (mismo color que el texto, sin subrayado) -------------- */
a.subtle,
a.subtle:visited {
  color: var(--color-text);
  text-decoration: none;
}

a.subtle:hover,
a.subtle:focus {
  color: var(--color-accent);
}

/* Contenido de inicio ------------------------------------------------------ */
.profile-header {
  text-align: center;
}

.profile-photo {
  border-radius: 50%;
  width: 10rem;
}

/* Publicaciones (Modelo 1) ------------------------------------------------- */
.publication {
  margin: 2rem 0;
}

.publication .pub-title {
  margin-bottom: 0.25rem;
}

.publication .pub-title a,
.publication .pub-title a:visited {
  color: var(--color-text);
  text-decoration: none;
  text-underline-offset: initial;
}

.publication .pub-title a:hover,
.publication .pub-title a:focus {
  color: var(--color-accent);
  text-decoration: none;
}

.publication .pub-authors {
  margin: 0.25rem 0;
}

.publication .pub-venue {
  margin: 0.25rem 0;
  color: var(--color-muted);
}

.publication .pub-links {
  margin: 0.25rem 0;
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

/* Proyectos (Modelo 2) ----------------------------------------------------- */
.project {
  margin: 2rem 0;
}

.project .proj-title {
  margin-bottom: 0.25rem;
}

.project .proj-title a,
.project .proj-title a:visited {
  color: var(--color-text);
  text-decoration: none;
}

.project .proj-title a:hover,
.project .proj-title a:focus {
  color: var(--color-accent);
  text-decoration: none;
}

.project .proj-desc {
  margin: 0.25rem 0;
}

.project .proj-tags {
  margin: 0.25rem 0;
  color: var(--color-muted);
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

/* Pie de página ------------------------------------------------------------ */
.site-footer {
  margin-top: 3rem;
  padding: 1.25rem 0 2rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* Responsive: único breakpoint (< 640px) ----------------------------------- */
@media (max-width: 639px) {
  body {
    font-size: 1rem;
    padding: 0 1rem;
  }

  h1 { font-size: 1.5rem; }

  .site-header nav {
    gap: 1rem;
  }

  .profile-photo {
    width: 7.5rem;
  }
}

/* PDF embed ---------------------------------------------------------------- */
embed[type="application/pdf"] {
  display: block;
  margin-top: 2rem;
  border: 1px solid var(--color-border);
  min-height: 800px;
}

/* Footer social icons ------------------------------------------------------ */
.site-footer {
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
}

.footer-links a {
  color: var(--color-muted);
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover,
.footer-links a:focus {
  color: var(--color-accent);
}

.footer-links svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}