/* AI4NTH Summer School GitHub Pages styling */

:root {
  --primary: #0b3d5c;
  --primary-light: #155f85;
  --accent: #39a2db;
  --accent-soft: #e8f6fc;
  --text: #1f2933;
  --muted: #5b6773;
  --border: #d8e2ea;
  --background: #ffffff;
  --card: #ffffff;
  --section: #f6f9fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--background);
  line-height: 1.65;
}

a {
  color: var(--primary-light);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--primary);
  font-weight: 700;
  font-size: 1.05rem;
}

.brand img {
  width: 132px;
  height: auto;
}

.nav {
  display: flex;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.nav a {
  display: inline-block;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
}

.nav a:hover {
  background: var(--accent-soft);
  text-decoration: none;
}

.hero {
  background:
    linear-gradient(135deg, rgba(11,61,92,0.96), rgba(21,95,133,0.92)),
    radial-gradient(circle at 20% 20%, rgba(57,162,219,0.45), transparent 30%);
  color: #ffffff;
  padding: 4.5rem 1.25rem;
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
}

.hero-kicker {
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-size: 0.86rem;
  font-weight: 700;
  opacity: 0.85;
  margin-bottom: 0.8rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 4.5vw, 4.2rem);
  line-height: 1.08;
  margin: 0 0 1.2rem;
  max-width: 900px;
}

.hero p {
  font-size: 1.18rem;
  max-width: 800px;
  margin: 0 0 1.8rem;
  color: #e7f4fb;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  padding: 0.75rem 1.05rem;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid transparent;
}

.button-primary {
  background: #ffffff;
  color: var(--primary);
}

.button-secondary {
  border-color: rgba(255,255,255,0.75);
  color: #ffffff;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2.2rem 1.25rem 4rem;
}

.section {
  padding: 2rem 0;
}

.section h2,
.page h1,
.page h2 {
  color: var(--primary);
  line-height: 1.25;
}

.grid {
  display: grid;
  gap: 1.1rem;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.25rem;
  box-shadow: 0 8px 24px rgba(15, 48, 73, 0.06);
}

.card h3 {
  margin-top: 0;
  color: var(--primary);
}

.info-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin-top: -2rem;
  position: relative;
  z-index: 2;
}

.info-box {
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.15rem;
  box-shadow: 0 12px 30px rgba(15, 48, 73, 0.12);
}

.info-box strong {
  display: block;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.notice {
  background: var(--accent-soft);
  border-left: 5px solid var(--accent);
  padding: 1rem 1.2rem;
  border-radius: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.8rem;
  vertical-align: top;
}

th {
  background: var(--primary);
  color: #ffffff;
  text-align: left;
}

tr:nth-child(even) td {
  background: #f8fbfd;
}

.footer {
  border-top: 1px solid var(--border);
  background: var(--section);
  color: var(--muted);
  padding: 1.5rem 1.25rem;
  text-align: center;
  font-size: 0.92rem;
}

.logo-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.logo-placeholder {
  border: 1px dashed var(--border);
  background: #f9fbfc;
  border-radius: 12px;
  padding: 0.7rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 760px) {
  .nav-container {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding: 3.2rem 1.25rem;
  }

  .brand img {
    width: 120px;
  }
}