/* ==========================================================================
   J. Rafael Sendra — personal academic website
   Fully static · self-contained · no external resources
   System fonts only (no web-font requests → no IP leakage)
   Palette: elegant academic blue (single accent)
   ========================================================================== */

:root {
  --bg:        #f4f6f9;
  --surface:   #ffffff;
  --ink:       #16202b;
  --ink-soft:  #44515f;
  --ink-faint: #78838f;
  --line:      #dde4ec;
  --line-soft: #e9eef4;
  --accent:    #1e4e79;   /* deep academic blue */
  --accent-2:  #2a6db0;   /* brighter blue (hover / highlights) */
  --box-border:#2a6db0;   /* full outline for boxes */
  --link:      #1e4e79;
  --grad:      linear-gradient(90deg, #163a5c 0%, #1e4e79 45%, #2a6db0 100%);
  --shadow:    0 1px 2px rgba(22,32,43,.05), 0 8px 24px rgba(22,32,43,.07);
  --maxw:      920px;
  --serif:     Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "Times New Roman", serif;
  --sans:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #10151b;
    --surface:   #18202a;
    --ink:       #e8edf3;
    --ink-soft:  #b9c4d0;
    --ink-faint: #8592a0;
    --line:      #2a343f;
    --line-soft: #222b34;
    --accent:    #7fb4e6;
    --accent-2:  #a3cbf1;
    --box-border:#3f658c;
    --link:      #7fb4e6;
    --grad:      linear-gradient(90deg, #5f9bd6 0%, #7fb4e6 45%, #a3cbf1 100%);
    --shadow:    0 1px 2px rgba(0,0,0,.25), 0 8px 24px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* thin coloured band across the very top of every page */
body::before {
  content: "";
  display: block;
  height: 4px;
  background: var(--grad);
}

/* Landing page: fit the whole intro (photo + text + stats) in one screen */
body.landing {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body.landing main {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 1.4rem;
  padding-bottom: 1.4rem;
}
body.landing .hero {
  width: 100%;
  margin-bottom: 1.4rem;
  padding: 1.6rem 1.8rem;
  gap: 1.6rem;
}
body.landing .portrait { max-width: 200px; }
body.landing .hero h1 { font-size: 2.1rem; }
body.landing .subtitle { margin-bottom: .55rem; }
body.landing .lead { font-size: 1rem; line-height: 1.5; margin-bottom: 0; }
body.landing h2:first-of-type {
  margin: 0 0 .7rem;
  font-size: 1.3rem;
  padding-bottom: .3rem;
}
body.landing .stats { margin-top: 0; gap: .7rem; }
body.landing .stats li { padding: .8rem .5rem; }
body.landing .stats .num { font-size: 1.6rem; }

/* About page: fit the whole content in one screen */
body.fit {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
body.fit main {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 1.4rem;
  padding-bottom: 1.4rem;
}
body.fit h1 { font-size: 1.9rem; margin: 0 0 .7rem; }
body.fit .lead { font-size: 1rem; line-height: 1.5; margin-bottom: 1rem; }
body.fit .card { padding: 1rem 2rem; margin-bottom: 0; }
body.fit .facts li { padding: .4rem 0; }
body.fit h2 { margin: 1.5rem 0 .7rem; font-size: 1.3rem; padding-bottom: .3rem; }
body.fit .areas { gap: .7rem; margin-top: 0; }
body.fit .areas li { padding: .7rem 1rem; font-size: .9rem; }

/* ---------- Skip link (accessibility) ---------- */
.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: .6rem 1rem; z-index: 100;
  border-radius: 0 0 6px 0; font-family: var(--sans); font-size: .9rem;
}
.skip:focus { left: 0; }

/* ---------- Header / nav ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  position: sticky; top: 0; z-index: 20;
}
.nav {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .4rem 1.5rem;
  min-height: 62px;
}
.brand {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .01em;
  color: var(--ink);
  text-decoration: none;
  margin-right: auto;
  padding: .9rem 0;
}
.brand span { color: var(--accent); }
.nav a.navlink {
  font-family: var(--sans);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  padding: .9rem 0;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
.nav a.navlink:hover { color: var(--accent-2); }
.nav a.navlink[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Layout ---------- */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
  padding: 2.2rem 2rem 2.4rem;
  margin-bottom: 2.5rem;
  border-radius: 8px;
  border: 1px solid var(--box-border);
  background: var(--surface);
}
.portrait {
  width: 100%;
  max-width: 240px;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 10px;
  border: 1px solid var(--line);
}
@media (min-width: 620px) {
  .hero {
    grid-template-columns: 240px 1fr;
    align-items: center;
    gap: 2rem;
  }
  .portrait { margin: 0; }
}
.hero h1 {
  font-size: 2.6rem;
  line-height: 1.1;
  margin: 0 0 .3rem;
  letter-spacing: -.01em;
}
.hero .subtitle {
  font-family: var(--sans);
  font-size: 1.02rem;
  color: var(--accent);
  letter-spacing: .02em;
  margin: 0 0 1rem;
}
.hero p { margin: 0 0 1rem; color: var(--ink-soft); }

/* ---------- Typography ---------- */
h2 {
  font-size: 1.7rem;
  margin: 2.6rem 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 3px solid transparent;
  border-image: var(--grad) 1;
  letter-spacing: -.005em;
}
h2:first-of-type { margin-top: 0; }
h3 {
  font-size: 1.15rem;
  font-family: var(--sans);
  letter-spacing: .02em;
  color: var(--accent);
  margin: 2rem 0 .8rem;
}
p { margin: 0 0 1.1rem; }
a { color: var(--link); }

.lead { font-size: 1.15rem; color: var(--ink-soft); }

/* ---------- Cards / info blocks ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--box-border);
  border-radius: 8px;
  padding: 1.4rem 2.4rem;
  margin-bottom: 1.4rem;
}

.facts {
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: var(--sans);
  font-size: .95rem;
}
/* When the facts list is also a card, keep the card's inner padding.
   Higher specificity (.facts.card) so it wins over .facts { padding: 0 }. */
.facts.card {
  padding: 1.4rem 2.4rem;
}
.facts li {
  display: flex;
  gap: 1rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.facts li:last-child { border-bottom: 0; }
.facts .k {
  color: var(--ink-faint);
  min-width: 130px;
  letter-spacing: .03em;
  text-transform: uppercase;
  font-size: .78rem;
  padding-top: .1rem;
}
.facts .v { color: var(--ink); }

/* ---------- Research areas grid ---------- */
.areas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}
.areas li {
  background: var(--surface);
  border: 1px solid var(--box-border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  font-family: var(--sans);
  font-size: .95rem;
  color: var(--ink-soft);
  transition: border-color .15s ease, background-color .15s ease;
}
.areas li:hover { border-color: var(--accent); background: var(--line-soft); }
.areas li strong {
  display: block;
  color: var(--accent);
  font-size: 1rem;
  margin-bottom: .2rem;
}

/* ---------- Stats row ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}
.stats li {
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--box-border);
  border-radius: 8px;
  padding: 1.2rem .8rem;
}
.stats .num {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stats .lbl {
  font-family: var(--sans);
  font-size: .74rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: .45rem;
  display: block;
}

/* ---------- Publication lists ---------- */
.pub-intro { color: var(--ink-soft); margin-bottom: 2rem; }

ol.pubs {
  list-style: none;
  counter-reset: none;
  padding: 0;
  margin: 0;
}
ol.pubs li {
  position: relative;
  padding: 1rem 0 1rem 3.4rem;
  border-bottom: 1px solid var(--line-soft);
}
ol.pubs li:last-child { border-bottom: 0; }
ol.pubs li .idx {
  position: absolute;
  left: 0;
  top: 1rem;
  font-family: var(--sans);
  font-size: .8rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border-radius: 5px;
  min-width: 2.5rem;
  text-align: center;
  padding: .15rem .3rem;
  letter-spacing: .01em;
}
@media (prefers-color-scheme: dark) {
  ol.pubs li .idx { color: #10151b; }  /* dark text on light-blue badge */
}
.pub-title {
  font-style: italic;
  color: var(--ink);
  display: block;
  margin-bottom: .15rem;
}
.pub-authors {
  font-family: var(--sans);
  font-size: .9rem;
  color: var(--ink-soft);
  display: block;
  margin-bottom: .15rem;
}
.pub-venue {
  font-size: .96rem;
  color: var(--ink-soft);
  display: block;
}
.pub-venue .year { color: var(--accent); font-weight: 600; }
.pub-ref {
  font-family: var(--sans);
  font-size: .78rem;
  color: var(--ink-faint);
  display: block;
  margin-top: .3rem;
  word-break: break-word;
}
.mine { font-weight: 700; color: var(--ink); font-style: normal; }

/* ---------- Section jump menu ---------- */
.jump {
  font-family: var(--sans);
  font-size: .85rem;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}
.jump a {
  text-decoration: none;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: .35rem .9rem;
  background: var(--surface);
  transition: all .15s;
}
.jump a:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  font-family: var(--sans);
  font-size: .85rem;
  color: var(--ink-faint);
}
.site-footer .wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.8rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
  justify-content: space-between;
}
.site-footer .contact { color: var(--ink-soft); }

/* ---------- Responsive (mobile) ---------- */
@media (max-width: 640px) {
  body { font-size: 17px; }

  /* Header: compact and NOT sticky, so a wrapped 7-item menu can't cover the page */
  .site-header { position: static; }
  .nav {
    min-height: 0;
    padding: .2rem 1.1rem .6rem;
    gap: .1rem 1rem;
    align-items: center;
  }
  .brand {
    width: 100%;
    margin-right: 0;
    padding: .6rem 0 .25rem;
    font-size: 1.05rem;
  }
  .nav a.navlink {
    padding: .3rem 0;
    font-size: .72rem;
    letter-spacing: .02em;
    border-bottom-width: 2px;
  }

  /* Drop the "fit in one screen" centring on phones: let pages flow and scroll */
  body.landing,
  body.fit { min-height: 0; display: block; }
  body.landing main,
  body.fit main {
    display: block;
    padding-top: 1.4rem;
    padding-bottom: 2.2rem;
  }

  /* Content spacing */
  .hero { padding: 1.6rem 1.3rem 1.8rem; }
  body.landing .hero { padding: 1.5rem 1.3rem; }
  .hero h1,
  body.landing .hero h1 { font-size: 1.85rem; }
  main { padding: 1.6rem 1.2rem 2.6rem; }
  .facts.card,
  body.fit .card { padding: 1rem 1.3rem; }
  .facts li { flex-direction: column; gap: .1rem; }
  .facts .k { min-width: 0; }
  .areas { grid-template-columns: 1fr; }
  ol.pubs li { padding-left: 0; padding-top: 2.4rem; }
  ol.pubs li .idx { top: .8rem; }
  .pub-title,
  .pub-venue { overflow-wrap: break-word; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .jump, .skip { display: none; }
  body { font-size: 11pt; background: #fff; color: #000; }
  body::before { display: none; }
  ol.pubs li .idx { background: none; color: #000; }
  a { color: #000; }
}