:root { --accent: #ec5c39; --bg: #f6f5ea; }

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: #000; font: 500 16px/1.5 Raleway, sans-serif; }
a { color: var(--accent); }
img { display: block; max-width: 100%; }

h1, h2 { font-family: "Space Grotesk", sans-serif; font-weight: 500; color: var(--accent); letter-spacing: -0.05em; }
h2 { font-size: 32px; margin: 0 0 24px; }
p { margin: 0 0 16px; }
.small { font-size: 14px; }

/* header */
header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px 32px; padding: 36px 4vw; }
header h1 { margin: 0; font-size: 25px; }
header h1 a { text-decoration: none; }
nav { display: flex; gap: 24px; font-size: 18px; }
nav a { color: #000; text-decoration: none; }
nav a:hover, nav a[aria-current] { text-decoration: underline; }
.menu { display: none; }

main { padding: 24px 4vw 96px; max-width: 1200px; margin: 0 auto; }
.round { aspect-ratio: 1; object-fit: cover; border-radius: 50%; width: 100%; }

/* home */
.home { display: grid; grid-template-columns: 1fr 2fr 1fr; gap: 48px; align-items: start; }
.home .round { max-width: 220px; margin-bottom: 16px; }
.news p { font-size: 14px; }

/* d3 lab */
.lab section { margin-bottom: 72px; }
.project { display: grid; grid-template-columns: 280px 1fr; gap: 48px; align-items: center; margin-bottom: 40px; }
.team { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px 48px; }
.team .round { max-width: 190px; margin-bottom: 12px; }

/* teaching */
.teaching { max-width: 720px; }
.course { margin-top: 40px; }
.course p:first-child { font-weight: 700; margin-bottom: 4px; }
.course .small { opacity: 0.7; }

@media (max-width: 767px) {
  /* phone menu */
  header { flex-wrap: nowrap; }
  header h1 { position: relative; z-index: 2; }
  .menu { display: block; position: relative; z-index: 2; width: 32px; height: 20px; padding: 0; border: 0; background: none; cursor: pointer; }
  .menu span { position: absolute; left: 0; right: 0; height: 2px; background: #000; transition: transform .2s; }
  .menu span:first-child { top: 4px; }
  .menu span:last-child { bottom: 4px; }
  .menu-open .menu span:first-child { transform: translateY(5px) rotate(45deg); }
  .menu-open .menu span:last-child { transform: translateY(-5px) rotate(-45deg); }
  nav { display: none; position: fixed; inset: 0; z-index: 1; background: var(--bg); flex-direction: column; justify-content: center; align-items: center; gap: 28px; font-size: 28px; }
  .menu-open nav { display: flex; }
  .menu-open { overflow: hidden; }

  .home { grid-template-columns: 1fr; gap: 24px; }
  .home > :first-child { text-align: center; }
  .home .round { margin: 0 auto 16px; }
  .project { grid-template-columns: 1fr; gap: 16px; }
  .project .round { max-width: 240px; margin: 0 auto; }
  .team { grid-template-columns: repeat(2, 1fr); gap: 24px; }
}