/* ============================================================
   Thomas A. Berrueta — personal site (single page)
   Clean, light/dark, responsive. No build step, no framework.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;1,6..72,400&display=swap');

:root {
  --bg:           #f4f2f1;   /* very light warm gray (page surface) */
  --bg-soft:      #eae5e2;   /* slightly deeper warm gray (footer) */
  --bg-card:      #ffffff;   /* white cards lift off the gray page */
  --bg-tint:      #fcf6f4;   /* faint warm/cardinal tint for cards */
  --border:       #e8e1dc;   /* warm light border */
  --text:         #201a1a;   /* warm near-black */
  --text-soft:    #6c615d;
  --text-faint:   #9d9189;
  --accent:       #8c1515;   /* Stanford cardinal */
  --accent-soft:  #f6e7e5;   /* cardinal tint */
  --accent-ink:   #5e0f0f;   /* deep maroon */
  --gold:         #9a6f2f;   /* sandstone / bronze secondary */
  --gold-soft:    #f4ecdb;
  --cardinal:     #8c1515;
  --glow:         140, 21, 21;   /* cardinal rgb, for colored shadows */
  --header-bg:    rgba(255,255,255,.86);
  --radius:       14px;
  --radius-sm:    9px;
  --maxw:         1000px;
  --shadow:       0 1px 2px rgba(40,25,25,.05), 0 6px 24px rgba(40,25,25,.07);
}

:root[data-theme="dark"] {
  --bg:           #1a1819;   /* neutral dark gray (faintly warm) */
  --bg-soft:      #211f1f;
  --bg-card:      #232020;
  --bg-tint:      #271f1f;   /* warm-tinted dark card */
  --border:       #393431;   /* warm gray border */
  --text:         #ededeb;
  --text-soft:    #b2a9a4;
  --text-faint:   #857c77;
  --accent:       #e27d74;   /* cardinal, lightened for dark gray */
  --accent-soft:  #2d1f1d;
  --accent-ink:   #f2b3ac;
  --gold:         #c8a463;   /* sandstone for dark */
  --gold-soft:    #2a2620;
  --cardinal:     #e27d74;
  --glow:         0, 0, 0;
  --header-bg:    rgba(26,24,25,.82);
  --shadow:       0 1px 2px rgba(0,0,0,.32), 0 6px 24px rgba(0,0,0,.42);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: clamp(16px, 1rem + 0.15vw, 18px);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .2s ease, color .2s ease;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 {
  font-family: 'Newsreader', Georgia, 'Times New Roman', serif;
  font-weight: 600; line-height: 1.18; color: var(--text); letter-spacing: -0.01em;
}

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 32px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--header-bg);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand {
  font-family: 'Newsreader', Georgia, serif; font-weight: 600; font-size: 1.2rem;
  color: var(--text); letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; color: var(--accent-ink); }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 10px; cursor: pointer;
  background: transparent; border: 1px solid var(--border); color: var(--text-soft);
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.theme-toggle svg { width: 19px; height: 19px; }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }

/* ---------- Sections ---------- */
section { padding: 50px 0; scroll-margin-top: 78px; }
section + section { border-top: 1px solid var(--border); }
.section-label {
  text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.74rem; font-weight: 600;
  color: var(--accent); margin: 0 0 10px; font-family: 'Inter', sans-serif;
}
h2.section-title { font-size: clamp(1.62rem, 1.3rem + 1.5vw, 2.15rem); margin: 0 0 6px; }
.lead { color: var(--text-soft); font-size: 1.05rem; }

/* ---------- Hero ---------- */
.hero { padding: 56px 32px 44px; }
.hero-grid { display: grid; grid-template-columns: 232px 1fr; gap: 40px; align-items: start; }
.hero-photo {
  width: 232px; height: 232px; border-radius: 50%; object-fit: cover;
  box-shadow: var(--shadow); border: 3px solid var(--bg-card); outline: 1px solid var(--border);
}
.hero h1 { font-size: clamp(2rem, 1.5rem + 2.4vw, 2.9rem); margin: 0 0 10px; }
.hero .role {
  font-family: 'Newsreader', Georgia, serif; font-weight: 600;
  font-size: clamp(1.32rem, 1.05rem + 1.35vw, 1.78rem); line-height: 1.25;
  color: var(--text); margin: 0 0 4px;
}
.hero .role .cardinal { color: var(--cardinal); }
.hero .role .role-date { color: var(--text-soft); font-weight: 500; white-space: nowrap; }
.hero .subrole {
  font-size: clamp(1.02rem, 0.97rem + 0.4vw, 1.18rem); color: var(--accent-ink);
  font-weight: 500; font-style: italic; margin: 0 0 18px;
}
.hero-bio { margin: 0 0 14px; max-width: 64ch; }
.hero-statement { text-align: center; max-width: 72ch; margin: 32px auto 0; color: var(--text); font-size: 1.06rem; }

.btn-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.btn {
  display: inline-flex; align-items: center; gap: 7px; padding: 9px 15px; border-radius: 10px;
  font-size: 0.93rem; font-weight: 500; border: 1px solid var(--border);
  background: var(--bg-card); color: var(--text);
  transition: border-color .15s ease, background .15s ease, transform .05s ease;
}
.btn:hover { text-decoration: none; border-color: var(--accent); background: var(--accent-soft); color: var(--accent-ink); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-ink); color: #fff; }
.btn svg { width: 17px; height: 17px; }

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .hero { padding: 30px 20px 26px; }
  .hero-grid { grid-template-columns: 1fr; gap: 20px; justify-items: start; }
  .hero-photo { width: 156px; height: 156px; }
}

/* ---------- PAL Lab callout ---------- */
.callout {
  position: relative;
  background:
    radial-gradient(130% 100% at 0% 0%, var(--accent-soft), transparent 58%),
    linear-gradient(180deg, var(--accent-soft), var(--bg-card) 60%);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 28px 30px 28px;
  box-shadow: 0 4px 14px rgba(40,25,25,.06), 0 22px 55px rgba(var(--glow), .15);
}
.callout .pill {
  display: inline-flex; align-items: center; gap: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-ink));
  color: #fff;
  font-family: 'Newsreader', Georgia, serif;
  font-size: clamp(1.18rem, 1rem + 0.85vw, 1.5rem);
  font-weight: 600; line-height: 1.12; letter-spacing: 0.005em;
  padding: 11px 22px; border-radius: 999px; margin: 2px 0 20px;
  box-shadow: 0 8px 22px rgba(var(--glow), .30);
}
.callout .pill svg { width: 1.08em; height: 1.08em; flex-shrink: 0; opacity: .95; color: rgba(255,255,255,.92); }
:root[data-theme="dark"] .callout .pill { background: linear-gradient(135deg, #c1554c, #8f302b); color: #fff5f3; box-shadow: 0 8px 22px rgba(0,0,0,.5); }
:root[data-theme="dark"] .btn.primary { background: #b3403a; border-color: #b3403a; color: #fff; }
:root[data-theme="dark"] .btn.primary:hover { background: #9b332e; border-color: #9b332e; color: #fff; }
.callout p { margin: 0 0 12px; color: var(--text-soft); }
.callout p:last-child { margin-bottom: 0; }
.callout .recruit { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--text); font-size: 0.97rem; }

/* ---------- News ---------- */
.news-list { list-style: none; margin: 18px 0 0; padding: 0; }
.news-item { display: grid; grid-template-columns: 84px 1fr; gap: 18px; padding: 15px 0; border-bottom: 1px solid var(--border); }
.news-item:last-child { border-bottom: none; }
.news-date { color: var(--text-faint); font-size: 0.82rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; padding-top: 2px; }
.news-body { margin: 0; color: var(--text); }
.news-body .new-tag {
  display: inline-block; background: var(--cardinal); color: #fff; font-size: 0.66rem;
  font-weight: 700; letter-spacing: 0.05em; padding: 2px 7px; border-radius: 5px;
  margin-right: 8px; vertical-align: 1px; font-family: 'Inter', sans-serif;
}
:root[data-theme="dark"] .news-body .new-tag { color: #1a0c0c; }
@media (max-width: 560px) { .news-item { grid-template-columns: 1fr; gap: 4px; } .news-date { padding-top: 0; } }

/* ---------- Research pillars ---------- */
.pillar-card {
  background: var(--bg-tint);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 24px 24px 24px 26px; margin-bottom: 22px; box-shadow: var(--shadow);
}
.pillar-card h3 { font-size: 1.28rem; margin: 0 0 4px; }
.pillar-card:first-of-type { margin-top: 16px; }
.pillar-card .kicker {
  font-family: 'Inter', sans-serif; font-size: 1em; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--accent); margin: 0 0 7px;
}
.pillar-card p { color: var(--text-soft); margin: 0 0 16px; }
.video {
  position: relative; width: 100%; aspect-ratio: 16 / 9; border-radius: var(--radius-sm);
  overflow: hidden; background: #000; border: 1px solid var(--border); margin: 2px 0 0;
}
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; background: #000; }
.video-facade {
  position: absolute; inset: 0; width: 100%; height: 100%;
  margin: 0; padding: 0; border: 0; background: #000; cursor: pointer; display: block;
}
.video-facade img { width: 100%; height: 100%; object-fit: cover; display: block; }
.video-facade .video-play {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
}
.video-facade .video-play svg { width: 68px; height: 48px; filter: drop-shadow(0 1px 4px rgba(0,0,0,.45)); }
.video-facade .video-play .yt-bg { fill: #212121; opacity: .82; transition: fill .15s ease, opacity .15s ease; }
.video-facade:hover .video-play .yt-bg, .video-facade:focus-visible .video-play .yt-bg { fill: #c4302b; opacity: 1; }

/* ---------- Publications ---------- */
.pubgroup { margin-bottom: 12px; }
.pubgroup > h2 { font-size: 1.25rem; margin: 26px 0 4px; padding-bottom: 8px; border-bottom: 2px solid var(--accent-soft); }
.pub { padding: 13px 0; border-bottom: 1px solid var(--border); }
.pub:last-child { border-bottom: none; }
.pub .title { font-weight: 600; color: var(--text); display: block; margin-bottom: 2px; }
.pub .authors { color: var(--text-soft); font-size: 0.94rem; }
.pub .authors .me { color: var(--text); font-weight: 600; }
.pub .venue { color: var(--text-soft); font-size: 0.94rem; font-style: italic; }
.pub .tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 9px; }
.tag { display: inline-block; padding: 3px 10px; border-radius: 7px; font-size: 0.78rem; font-weight: 600; color: #fff; font-family: 'Inter', sans-serif; }
.tag:hover { text-decoration: none; opacity: 0.88; }
.tag.article { background: #c98a1a; }
.tag.pdf     { background: #2f8f4e; }
.tag.bib     { background: #3a6ea5; }
.tag.code    { background: #b4453a; }
.tag.vid     { background: #7a4fb0; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 32px 0; margin-top: 8px; color: var(--text-faint); font-size: 0.9rem; }
.site-footer .foot-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; align-items: center; }
.site-footer a { color: var(--text-soft); }
.foot-links { display: flex; flex-wrap: wrap; gap: 16px; }

.muted { color: var(--text-soft); }