/* ==========================================================================
   Gustavo Grullon — academic site
   Clean, modern, framework-free stylesheet
   ========================================================================== */

:root {
  --rice-blue: #00205b;
  --rice-blue-light: #1d3f7a;
  --accent: #8a6d3b;
  --ink: #1c1e21;
  --ink-soft: #4a5260;
  --bg: #fbfaf8;
  --bg-alt: #f2f0ec;
  --card-bg: #ffffff;
  --border: #e4e1da;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(20, 20, 30, 0.04), 0 8px 24px rgba(20, 20, 30, 0.06);
  --max-width: 920px;
  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--rice-blue);
  line-height: 1.2;
  margin: 0 0 0.5em;
}

a {
  color: var(--rice-blue);
  text-decoration: none;
}

a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Navigation ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 250, 248, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-nav .brand {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--rice-blue);
  letter-spacing: 0.01em;
}

.site-nav .brand:hover {
  text-decoration: none;
  color: var(--rice-blue);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--ink-soft);
  font-weight: 500;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--rice-blue);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--rice-blue);
  margin: 5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ---------- Hero / bio ---------- */

.hero {
  padding: 3.5rem 0 2.5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
}

.hero-photo img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  object-fit: cover;
  aspect-ratio: 3 / 4;
}

.hero-name {
  font-size: clamp(1.9rem, 3vw, 2.4rem);
  margin-bottom: 0.15em;
}

.hero-title {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin-bottom: 1.25rem;
  font-weight: 500;
}

.hero-meta {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: 1.25rem;
}

.hero-meta div {
  margin-bottom: 0.2rem;
}

.hero-meta a {
  color: var(--ink-soft);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pill {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--rice-blue);
  background: var(--card-bg);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.pill:hover {
  background: var(--rice-blue);
  color: #fff;
  border-color: var(--rice-blue);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ---------- Bio ---------- */

.bio {
  padding: 0.5rem 0 2.5rem;
  font-size: 1.05rem;
  color: var(--ink);
  max-width: 760px;
}

/* ---------- Stat strip ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.stat {
  text-align: center;
}

.stat-value {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--rice-blue);
  font-weight: 600;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.15rem;
}

/* ---------- Section headings ---------- */

.page-header {
  padding: 3rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.page-header h1 {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  margin-bottom: 0.3rem;
}

.page-header p {
  color: var(--ink-soft);
  margin: 0;
}

section.block {
  padding-bottom: 3rem;
}

section.block h2 {
  font-size: 1.4rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  margin-bottom: 1.5rem;
}

/* ---------- Publications ---------- */

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}

.pub:first-child {
  padding-top: 0;
}

.pub-title {
  font-weight: 600;
  color: var(--ink);
  font-size: 1.02rem;
}

.pub-meta {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin-top: 0.2rem;
}

.pub-journal {
  font-style: italic;
}

.pub-tags {
  margin-top: 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  font-size: 0.75rem;
  color: var(--accent);
  background: #f6efe3;
  border-radius: 5px;
  padding: 0.15rem 0.55rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.pub-links {
  margin-top: 0.4rem;
}

.pub-links a {
  font-size: 0.88rem;
  font-weight: 600;
  margin-right: 1rem;
}

.pub-links .ssrn-pending {
  font-size: 0.85rem;
  color: #a3a3a3;
  font-style: italic;
}

.subhead {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin: -0.5rem 0 1rem;
}

/* ---------- Data page ---------- */

.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.data-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.data-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
}

.data-card .file-links a {
  display: inline-block;
  margin: 0 0.5rem 0.5rem 0;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
}

.data-card .file-links a:hover {
  background: var(--rice-blue);
  color: #fff;
  text-decoration: none;
}

.data-card .file-group {
  margin-bottom: 1rem;
}

.data-card .file-group:last-child {
  margin-bottom: 0;
}

.data-card .file-group-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.4rem;
}

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

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 2rem;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 700px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-photo {
    max-width: 200px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem 1.5rem;
    gap: 1rem;
    display: none;
  }

  .nav-links.open {
    display: flex;
  }
}