/* ===== Base Reset & Typography ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent: #8f1717;
  --accent-hover: #b82e2e;
  --text: #2a2a2a;
  --text-light: #555;
  --bg: #fff;
  --bg-alt: #f8f7f5;
  --border: #e0ddd8;
  --max-w: 860px;
  --font-body: 'Crimson Text', Georgia, serif;
  --font-heading: 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-nav: 'Open Sans', sans-serif;
}

html { font-size: 18px; scroll-behavior: smooth; }

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

a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-hover); }

h1, h2, h3 { font-family: var(--font-heading); font-weight: 600; line-height: 1.3; }
h2 { font-size: 1.25rem; margin: 2rem 0 .75rem; color: var(--text); letter-spacing: .01em; }

/* ===== Layout ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* ===== Header / Nav ===== */
header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: .5px;
}
.site-title a { color: inherit; }
.site-title a:hover { color: var(--accent); }

nav { display: flex; gap: 1.5rem; align-items: center; }
nav a {
  font-family: var(--font-nav);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-light);
  font-weight: 600;
  padding: .2rem 0;
  border-bottom: 2px solid transparent;
  transition: color .15s, border-color .15s;
}
nav a:hover, nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Hamburger */
.hamburger { display: none; background: none; border: none; cursor: pointer; padding: .5rem; }
.hamburger span, .hamburger span::before, .hamburger span::after {
  display: block; width: 22px; height: 2px; background: var(--text); transition: .2s;
}
.hamburger span { position: relative; }
.hamburger span::before, .hamburger span::after { content: ''; position: absolute; left: 0; }
.hamburger span::before { top: -7px; }
.hamburger span::after { top: 7px; }

@media (max-width: 700px) {
  .hamburger { display: block; }
  nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: .75rem;
  }
  nav.open { display: flex; }
  nav a { font-size: .85rem; }
}

/* ===== Home: Two-column hero ===== */
.hero {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.5rem;
  padding: 2.5rem 0 2rem;
  align-items: start;
}

.hero-photo img {
  width: 100%;
  border-radius: 4px;
}

.hero-logo {
  max-width: 180px;
  margin: 1rem auto 0;
  display: block;
}

.hero-links {
  text-align: center;
  margin-top: 1rem;
  font-size: .9rem;
}
.hero-links a { margin: 0 .4rem; }

.social-links {
  text-align: center;
  margin-top: .5rem;
  font-size: .85rem;
}
.social-links a { margin: 0 .35rem; color: var(--text-light); }
.social-links a:hover { color: var(--accent); }

.hero-text { font-size: 1rem; }
.hero-text .position { font-size: 1.05rem; margin-bottom: 1rem; line-height: 1.6; }
.hero-text .bio { margin-bottom: 1.25rem; }
.hero-text .presentations { color: var(--text-light); font-size: .95rem; }

@media (max-width: 700px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    text-align: center;
  }
  .hero-photo { max-width: 220px; margin: 0 auto; }
}

/* ===== Content sections ===== */
main { padding: 1.5rem 0 3rem; }

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* ===== Research page ===== */
.paper {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}
.paper:last-child { border-bottom: none; }

.paper-title {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: .25rem;
}
.paper-title a { color: var(--text); }
.paper-title a:hover { color: var(--accent); }

.paper-meta {
  font-size: .9rem;
  color: var(--text-light);
  margin-bottom: .35rem;
}

.paper-venue {
  font-weight: 700;
  font-family: var(--font-heading);
  font-size: .85rem;
}

.paper-award {
  font-family: var(--font-heading);
  font-size: .82rem;
  font-weight: 600;
  color: var(--accent);
}

.paper-abstract {
  font-size: .92rem;
  margin: .5rem 0;
  line-height: 1.6;
}

.paper-links {
  font-size: .85rem;
  margin-top: .35rem;
}
.paper-links a { margin-right: .75rem; }

.paper-media {
  font-size: .82rem;
  color: var(--text-light);
  margin-top: .25rem;
}

/* ===== CV page ===== */
.cv-download {
  margin: 1.5rem 0;
  font-size: 1rem;
}

.cv-embed {
  width: 100%;
  height: 800px;
  border: 1px solid var(--border);
  border-radius: 4px;
}

/* ===== Discussions page ===== */
.discussion-list { list-style-type: decimal; padding-left: 1.5rem; }
.discussion-list li {
  padding: .4rem 0;
  font-size: .92rem;
  line-height: 1.55;
}

.lecture-list { list-style-type: decimal; padding-left: 1.5rem; }
.lecture-list li {
  padding: .35rem 0;
  font-size: .92rem;
}

/* ===== Data & Codes page ===== */
.data-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .95rem;
}
.data-item:last-child { border-bottom: none; }

.code-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .75rem 0;
  border-bottom: 1px solid var(--border);
  font-size: .92rem;
}
.code-item:last-child { border-bottom: none; }

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  text-align: center;
  font-family: var(--font-nav);
  font-size: .75rem;
  color: var(--text-light);
  letter-spacing: .3px;
}