/* === IOL Lab — GitHub Pages === */

/* --- Self-hosted JetBrains Mono (OFL license) --- */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  /* IOL blue palette (from iol.zib.de) */
  --primary: #2a4155;
  --primary-dark: #1e3044;
  --primary-light: #3a5a75;
  --dark: #212529;
  --dark-mid: #2a4155;
  --accent: #3a5a75;
  --light: #f8f9fa;
  --gray: #6c757d;
  --gray-light: #e9ecef;
  --white: #ffffff;
  --font: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --max-w: 1100px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  color: var(--dark);
  line-height: 1.75;
  letter-spacing: -0.01em;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

/* ---------- NAV ---------- */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-light);
  padding: 0 2rem;
}
nav .nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
nav .logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--dark);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
nav .logo-wrap {
  display: inline-block;
  height: 36px;
  background: var(--primary);
  border-radius: 50%;
  line-height: 0;
}
nav .logo-img {
  height: 36px;
  width: auto;
  mix-blend-mode: screen;
}
nav .logo span { color: var(--primary); }
nav ul { list-style: none; display: flex; gap: 1.8rem; }
nav ul a {
  color: var(--gray);
  font-size: 0.88rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}
nav ul a:hover { color: var(--primary); }

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(42, 65, 85, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(58, 90, 117, 0.06) 0%, transparent 50%),
    var(--white);
}
.hero-content { max-width: 750px; }
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--dark);
  margin-bottom: 0.4em;
}
.hero h1 span { color: var(--primary); }
.hero .subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--gray);
  max-width: 560px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}
.hero .affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
  font-size: 0.85rem;
  color: var(--gray);
}
.hero .affiliations a { color: var(--accent); font-weight: 500; }
.hero .hero-note {
  font-size: 0.85rem;
  color: var(--gray);
  margin-bottom: 2rem;
}
.hero .cta-row { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); color: var(--white); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(42, 65, 85, 0.35); }
.btn-outline { border: 2px solid var(--gray-light); color: var(--dark); background: transparent; }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-1px); }

/* ---------- SECTIONS ---------- */
section { padding: 5rem 2rem; }
section:nth-child(even) { background: var(--light); }
.section-inner { max-width: var(--max-w); margin: 0 auto; }
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--primary);
  margin-bottom: 0.6rem;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.section-desc {
  color: var(--gray);
  max-width: 600px;
  margin-bottom: 2.5rem;
  font-size: 0.95rem;
}

/* ---------- CARD GRID ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.2rem;
}
.card {
  display: block;
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: 10px;
  padding: 1.8rem;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
}
.card:hover { border-color: var(--primary); color: inherit; transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06); }
.card .card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--primary);
  background: rgba(42, 65, 85, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.8rem;
}
.card-bear {
  position: relative;
  overflow: hidden;
}
.card-bear::after {
  content: '';
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 120px;
  height: 120px;
  background-image: var(--bear);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  opacity: 0.1;
  pointer-events: none;
  transition: opacity var(--transition);
}
.card-bear:hover::after { opacity: 0.2; }
.card-bear > * { position: relative; z-index: 1; }
.card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.card p {
  color: var(--gray);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ---------- SOFTWARE ---------- */
.software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.2rem;
}
.repo-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: 10px;
  padding: 1.2rem 1.5rem;
  transition: all var(--transition);
}
.repo-card:hover { border-color: var(--primary); transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06); }
.repo-card .repo-icon {
  width: 40px; height: 40px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; color: var(--white); flex-shrink: 0;
}
.repo-icon.julia { background: #9558b2; }
.repo-icon.python { background: #3572a5; }
.repo-icon.scip { background: #2a4155; }
.repo-icon.rust { background: #dea584; color: #000; }
.repo-card .repo-info h4 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.15rem; }
.repo-card .repo-info p { font-size: 0.8rem; color: var(--gray); line-height: 1.4; }
.software-heading {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray);
  margin-bottom: 1rem;
}

/* ---------- BLOG ---------- */
.blog-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.blog-post {
  display: block;
  background: var(--white);
  border: 1px solid var(--gray-light);
  border-radius: 10px;
  padding: 1.4rem 1.8rem;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
}
.blog-post:hover { border-color: var(--primary); color: inherit; transform: translateY(-2px); box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06); }
.blog-post .blog-date {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--gray);
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
}
.blog-post h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  line-height: 1.4;
}
.blog-post p {
  color: var(--gray);
  font-size: 0.85rem;
  line-height: 1.5;
}
.blog-loading { color: var(--gray); font-size: 0.85rem; }

/* ---------- NUMBERS ---------- */
.numbers {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  margin-bottom: 2rem;
}
.numbers .num { text-align: center; }
.numbers .num strong {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.03em;
}
.numbers .num span { font-size: 0.82rem; color: var(--gray); text-transform: uppercase; letter-spacing: 0.06em; }

/* ---------- FOOTER ---------- */
footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.6);
  padding: 3rem 2rem;
  font-size: 0.85rem;
}
footer .footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
}
footer a { color: rgba(255, 255, 255, 0.8); }
footer a:hover { color: var(--white); }
footer .footer-brand { font-weight: 700; color: var(--white); font-size: 1rem; margin-bottom: 0.5rem; }
footer .footer-links { display: flex; gap: 1.5rem; }
footer .addresses { display: flex; gap: 3rem; flex-wrap: wrap; }
footer .addresses div { line-height: 1.8; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
  nav ul { gap: 1rem; }
  nav ul a { font-size: 0.78rem; }
  .hero { min-height: auto; padding: 8rem 1.5rem 4rem; }
  section { padding: 3.5rem 1.5rem; }
  .numbers { gap: 1.5rem; }
  .card-grid, .software-grid { grid-template-columns: 1fr; }
  footer .addresses { flex-direction: column; gap: 1.5rem; }
}

@media (max-width: 480px) {
  nav ul { display: none; }
  .hero .cta-row { flex-direction: column; align-items: center; }
  .numbers .num strong { font-size: 1.6rem; }
}