/* ---------------------------------------------------
   Brayan Gutierrez — personal site
   Clean academic/CV style
--------------------------------------------------- */

:root {
  --bg: #fbfaf8;
  --bg-alt: #f2f0eb;
  --ink: #1c1c1a;
  --ink-soft: #4a4a45;
  --ink-faint: #7a786f;
  --accent: #6b3f2b;
  --accent-soft: #8a5a3f;
  --rule: #dedad0;
  --card-bg: #ffffff;
  --max-width: 860px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151a;
    --bg-alt: #1e1d22;
    --ink: #ece9e2;
    --ink-soft: #c6c2b8;
    --ink-faint: #8f8c83;
    --accent: #d7a27a;
    --accent-soft: #c88c60;
    --rule: #33323a;
    --card-bg: #1e1d22;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* -------- nav -------- */
header.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251, 250, 248, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
@media (prefers-color-scheme: dark) {
  header.site-nav { background: rgba(22, 21, 26, 0.88); }
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.nav-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  white-space: nowrap;
}

nav.links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.92rem;
}

nav.links a { color: var(--ink-soft); }
nav.links a:hover { color: var(--accent); text-decoration: none; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 6px 10px;
  color: var(--ink);
  font-size: 0.85rem;
  cursor: pointer;
}

@media (max-width: 620px) {
  nav.links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 10px;
    padding-top: 12px;
  }
  nav.links.open { display: flex; }
  .nav-toggle { display: inline-block; }
  .nav-inner { flex-wrap: wrap; }
}

/* -------- hero -------- */
.hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--rule);
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 32px;
}

.headshot {
  width: 132px;
  height: 132px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--rule);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.hero-text { min-width: 0; }

@media (max-width: 620px) {
  .hero-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
  .headshot { width: 108px; height: 108px; }
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 2.6rem);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.hero .tagline {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 20px;
}

.hero .affiliations {
  color: var(--ink-faint);
  font-size: 0.95rem;
  margin: 0 0 22px;
}

.hero .cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 0.92rem;
  border: 1px solid var(--rule);
  color: var(--ink);
}
.btn:hover { text-decoration: none; border-color: var(--accent-soft); color: var(--accent); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fdf9f4;
}
.btn.primary:hover { background: var(--accent-soft); border-color: var(--accent-soft); color: #fff; }

/* -------- sections -------- */
section {
  padding: 48px 0;
  border-bottom: 1px solid var(--rule);
}
section:last-of-type { border-bottom: none; }

section h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  margin: 0 0 22px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

section h2 .num {
  font-size: 0.85rem;
  color: var(--ink-faint);
  font-weight: 400;
  font-family: var(--sans);
}

.lede {
  color: var(--ink-soft);
  max-width: 68ch;
}

/* -------- research experience -------- */
.timeline { display: flex; flex-direction: column; gap: 26px; }

.entry { display: grid; grid-template-columns: 150px 1fr; gap: 18px; }
@media (max-width: 620px) {
  .entry { grid-template-columns: 1fr; gap: 4px; }
}

.entry .when {
  color: var(--ink-faint);
  font-size: 0.85rem;
  white-space: nowrap;
  padding-top: 2px;
}

.entry h3 {
  margin: 0 0 4px;
  font-size: 1.02rem;
  font-weight: 600;
}

.entry .who {
  color: var(--ink-soft);
  font-size: 0.92rem;
  margin: 0 0 6px;
}

.entry p.desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.entry .repo-link {
  display: inline-block;
  margin-top: 6px;
  font-size: 0.88rem;
}

/* -------- projects grid -------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 620px) {
  .projects-grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card h3 {
  margin: 0;
  font-size: 1rem;
}

.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--accent); }

.card .meta {
  font-size: 0.82rem;
  color: var(--ink-faint);
  display: flex;
  gap: 10px;
  align-items: center;
}

.lang-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
  background: var(--accent-soft);
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
  flex-grow: 1;
}

.card .repo-cta {
  font-size: 0.85rem;
  margin-top: 4px;
}

/* -------- publications / presentations -------- */
.pub-list, .pres-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 18px; }

.pub-list li, .pres-list li { font-size: 0.95rem; }

.pub-list .pub-title { font-weight: 600; }
.pub-list .pub-meta, .pres-list .pres-meta { color: var(--ink-faint); font-size: 0.88rem; }

/* -------- honors -------- */
.honors-list {
  columns: 2;
  column-gap: 32px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.honors-list li {
  break-inside: avoid;
  padding: 5px 0;
  border-bottom: 1px dotted var(--rule);
}
@media (max-width: 620px) { .honors-list { columns: 1; } }

/* -------- skills -------- */
.skills-groups { display: flex; flex-direction: column; gap: 14px; }
.skill-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: baseline; }
.skill-row .label {
  min-width: 130px;
  font-size: 0.85rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  background: var(--bg-alt);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* -------- contact / footer -------- */
.contact-row { display: flex; gap: 22px; flex-wrap: wrap; font-size: 0.95rem; }

footer {
  padding: 32px 0 60px;
  color: var(--ink-faint);
  font-size: 0.85rem;
}