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

:root {
  --color-bg: #0f1117;
  --color-bg-raised: #161821;
  --color-bg-card: #1a1d28;
  --color-text: #d4d2cb;
  --color-text-light: #8a8880;
  --color-accent: #4ecb8d;
  --color-accent-dim: #3a9968;
  --color-accent-glow: rgba(78, 203, 141, 0.08);
  --color-accent-light: #1a2e24;
  --color-border: #2a2d38;
  --color-white: #1e2028;
  --color-highlight: #e8c547;
  --font-body: 'Lora', 'Georgia', serif;
  --font-heading: 'Outfit', 'Helvetica Neue', sans-serif;
  --max-width: 1040px;
  --nav-height: 56px;
}

/* Light mode */
[data-theme="light"] {
  --color-bg: #f5f4f0;
  --color-bg-raised: #ededea;
  --color-bg-card: #ffffff;
  --color-text: #2c2c2c;
  --color-text-light: #5a5a5a;
  --color-accent: #1d8a54;
  --color-accent-dim: #15693f;
  --color-accent-glow: rgba(29, 138, 84, 0.06);
  --color-accent-light: #e2f2ea;
  --color-border: #d5d3cc;
  --color-white: #ffffff;
  --color-highlight: #b8960e;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --color-bg: #f5f4f0;
    --color-bg-raised: #ededea;
    --color-bg-card: #ffffff;
    --color-text: #2c2c2c;
    --color-text-light: #5a5a5a;
    --color-accent: #1d8a54;
    --color-accent-dim: #15693f;
    --color-accent-glow: rgba(29, 138, 84, 0.06);
    --color-accent-light: #e2f2ea;
    --color-border: #d5d3cc;
    --color-white: #ffffff;
    --color-highlight: #b8960e;
  }
}

html { font-size: 17px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}
a:hover { border-bottom-color: var(--color-accent); }

img { max-width: 100%; height: auto; display: block; }

/* ── Navigation ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-raised);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}
nav .nav-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
nav .nav-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-accent);
  letter-spacing: -0.01em;
  border-bottom: none;
}
nav .nav-name:hover { border-bottom: none; }
nav .nav-links { display: flex; gap: 1.6rem; align-items: center; }
nav .nav-links a {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-bottom: none;
  padding: 2px 0;
  position: relative;
  transition: color 0.2s;
}
nav .nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}
nav .nav-links a:hover::after,
nav .nav-links a.active::after { width: 100%; }
nav .nav-links a:hover,
nav .nav-links a.active { color: var(--color-accent); border-bottom: none; }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--color-text); margin: 5px 0; transition: 0.2s;
}
@media (max-width: 700px) {
  .nav-toggle { display: block; }
  nav .nav-links {
    display: none; position: absolute; top: var(--nav-height);
    left: 0; right: 0; background: var(--color-bg-raised);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column; padding: 1rem 2rem; gap: 0.8rem;
  }
  nav .nav-links.open { display: flex; }
}

/* ── Layout ── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

/* ── Hero ── */
.hero {
  display: flex; gap: 3rem; align-items: flex-start;
  margin-bottom: 3rem; padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--color-border);
}
.hero-photo {
  width: 220px; min-width: 220px; border-radius: 6px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3), 0 0 40px var(--color-accent-glow);
  border: 1px solid var(--color-border);
}
.hero-text h1 {
  font-family: var(--font-heading); font-size: 2rem; font-weight: 700;
  line-height: 1.2; margin-bottom: 0.3rem; letter-spacing: -0.02em;
  color: var(--color-accent);
}
.hero-text .tagline {
  font-size: 0.95rem; color: var(--color-text);
  margin-bottom: 1rem; line-height: 1.6;
}
.hero-text .affiliation {
  font-size: 0.85rem; color: var(--color-text-light); margin-bottom: 1.2rem;
}
.hero-links { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.hero-links a {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-family: var(--font-heading); font-size: 0.78rem; font-weight: 500;
  padding: 0.35rem 0.7rem; background: var(--color-accent-light);
  color: var(--color-accent); border-radius: 4px;
  border: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  transition: background 0.2s, border-color 0.2s;
}
.hero-links a:hover {
  background: var(--color-accent-glow);
  border-color: var(--color-accent-dim);
  border-bottom-color: var(--color-accent-dim);
}
.hero-links a svg { width: 14px; height: 14px; }
@media (max-width: 640px) {
  .hero { flex-direction: column; align-items: center; text-align: center; gap: 1.5rem; }
  .hero-photo { width: 180px; min-width: 180px; }
  .hero-links { justify-content: center; }
}

/* ── Section cards ── */
.section-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.section-card {
  padding: 1.5rem; background: var(--color-bg-card);
  border: 1px solid var(--color-border); border-radius: 6px;
  transition: box-shadow 0.25s, border-color 0.25s;
}
.section-card:hover {
  box-shadow: 0 2px 16px var(--color-accent-glow);
  border-color: var(--color-accent-dim);
}
.section-card h2 {
  font-family: var(--font-heading); font-size: 1.1rem; font-weight: 700;
  margin-bottom: 0.5rem; color: var(--color-accent);
}
.section-card p { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 0.8rem; }
.section-card .card-link {
  font-family: var(--font-heading); font-size: 0.82rem; font-weight: 600;
  color: var(--color-accent); border-bottom: none;
}
.section-card .card-link:hover { border-bottom: 1px solid var(--color-accent); }
@media (max-width: 640px) { .section-cards { grid-template-columns: 1fr; } }

/* ── Page headings ── */
.page-title {
  font-family: var(--font-heading); font-size: 1.8rem; font-weight: 700;
  letter-spacing: -0.02em; margin-bottom: 1.5rem;
  padding-bottom: 0.8rem; border-bottom: 2px solid var(--color-accent);
  color: var(--color-accent);
}

/* ── Markdown headings ── */
h1 { font-family: var(--font-heading); color: var(--color-accent); }
h2 { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700; margin-top: 2rem; margin-bottom: 0.8rem; color: var(--color-accent); }
h3 { font-family: var(--font-heading); font-size: 1.05rem; font-weight: 600; margin-top: 1.4rem; margin-bottom: 0.5rem; }
p { margin-bottom: 0.9rem; }
ul, ol { margin-left: 1.2rem; margin-bottom: 1rem; }
li { margin-bottom: 0.4rem; }

/* ── Figure ── */
.fig { margin: 1.5rem 0; text-align: center; }
.fig img {
  border-radius: 4px; margin: 0 auto;
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
  border: 1px solid var(--color-border);
}
.fig figcaption {
  font-size: 0.8rem; color: var(--color-text-light); margin-top: 0.5rem;
  font-style: italic; max-width: 600px; margin-left: auto; margin-right: auto;
}

/* ── Video ── */
.video-embed {
  position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;
  margin: 1.5rem 0; border-radius: 4px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
  border: 1px solid var(--color-border);
}
.video-embed iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }

/* ── CV entries ── */
.cv-entry {
  margin-bottom: 1.2rem; padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--color-border);
}
.cv-entry:last-child { border-bottom: none; }
.cv-entry-header {
  display: flex; justify-content: space-between;
  align-items: baseline; gap: 1rem; flex-wrap: wrap;
}
.cv-entry-title { font-family: var(--font-heading); font-weight: 700; font-size: 0.95rem; }
.cv-entry-date { font-family: var(--font-heading); font-size: 0.82rem; color: var(--color-accent-dim); white-space: nowrap; }
.cv-entry-detail { font-size: 0.9rem; color: var(--color-text-light); margin-top: 0.2rem; }
.cv-entry-description { font-size: 0.9rem; margin-top: 0.3rem; font-style: italic; color: var(--color-text-light); }

/* ── Publications ── */
.pub-item { margin-bottom: 1rem; padding-left: 1rem; border-left: 3px solid var(--color-accent-dim); font-size: 0.9rem; }
.pub-item .pub-title { font-weight: 600; }
.pub-item .pub-authors { color: var(--color-text-light); font-size: 0.85rem; }

/* ── Media list ── */
.media-item { display: flex; gap: 0.5rem; align-items: baseline; margin-bottom: 0.5rem; font-size: 0.9rem; flex-wrap: wrap; }
.media-item .media-outlet { font-weight: 600; white-space: nowrap; }
.media-item .media-date { font-size: 0.8rem; color: var(--color-text-light); white-space: nowrap; }

/* ── Footer ── */
footer {
  border-top: 1px solid var(--color-border); padding: 1.5rem 2rem;
  text-align: center; font-size: 0.78rem; color: var(--color-text-light);
  font-family: var(--font-heading);
}
footer a { color: var(--color-text-light); }

/* ── Highlight box ── */
.highlight-box {
  background: var(--color-accent-light); border-left: 4px solid var(--color-accent);
  padding: 1rem 1.2rem; border-radius: 0 4px 4px 0;
  margin: 1.5rem 0; font-size: 0.92rem;
}

/* ── Talks ── */
.talk-item { margin-bottom: 0.8rem; padding-bottom: 0.8rem; border-bottom: 1px solid var(--color-border); }
.talk-item:last-child { border-bottom: none; }
.talk-title { font-weight: 600; font-size: 0.92rem; }
.talk-venue { font-size: 0.85rem; color: var(--color-text-light); }

/* ── Theme toggle ── */
.theme-toggle {
  background: none; border: 1px solid var(--color-border); border-radius: 4px;
  cursor: pointer; padding: 4px 8px; font-size: 1rem; line-height: 1;
  color: var(--color-text); transition: border-color 0.2s;
}
.theme-toggle:hover { border-color: var(--color-accent); }