:root {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --text: #111827;
  --text-light: #e5e7eb;
  --muted: #64748b;
  --border: #e5e7eb;
  --accent: #2563eb;
  --card-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --radius: 18px;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: white;
  line-height: 1.65;
}

img,
video {
  max-width: 100%;
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
}

.narrow {
  width: min(820px, calc(100% - 2rem));
  margin: 0 auto;
}

.hero {
  background: linear-gradient(135deg, var(--bg), var(--bg-soft));
  color: white;
  padding: 5rem 0 4rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  color: #93c5fd;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.15;
  max-width: 1000px;
}

.subtitle {
  margin-top: 1.2rem;
  max-width: 850px;
  font-size: 1.1rem;
  color: #dbeafe;
}

.hero-links {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.button {
  display: inline-block;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  font-weight: 700;
  transition: 0.2s ease;
}

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

.button.primary {
  background: white;
  color: var(--bg);
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: white;
}

.section {
  padding: 4.5rem 0;
}

.section.alt {
  background: var(--surface-soft);
}

.section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 2rem;
  line-height: 1.2;
}

.section-text {
  max-width: 850px;
  margin-bottom: 1.5rem;
}

.justified-text {
  text-align: justify;
  text-justify: inter-word;
}

.hero-image {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  margin-top: 1rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--card-shadow);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.6rem;
  font-size: 1.1rem;
}

.author-cards {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.author-card {
  text-align: center;
}

.author-photo {
  width: 160px;
  height: 160px;
  object-fit: cover;
  object-position: center;
  border-radius: 16px;
  margin: 0 auto 1rem;
  border: 1px solid var(--border);
  box-shadow: var(--card-shadow);
}

.author-card h3 {
  margin: 0 0 0.6rem;
  font-size: 1.05rem;
  line-height: 1.3;
}

.author-affiliation {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.author-role {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 0.9rem;
}

.author-link {
  font-weight: 700;
}

.video-wrapper {
  margin-top: 1.5rem;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
  background: #000;
}

.video-wrapper video {
  width: 100%;
  height: auto;
}

.project-link-cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.link-card {
  display: block;
  color: var(--text);
  transition: 0.2s ease;
}

.link-card:hover {
  text-decoration: none;
  border-color: #bfdbfe;
  transform: translateY(-1px);
}

.link-title {
  display: block;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.link-desc {
  display: block;
  color: var(--muted);
}

.contact-icons {
  margin-top: 1rem;
}

.contact-icons a {
  text-decoration: none;
}

.contact-icons img {
  display: inline-block;
  vertical-align: middle;
}

.contact-logo {
  margin-top: 1.6rem;
  display: block;
}

.iele-logo {
  width: min(450px, 100%);
  height: auto;
  display: block;
}

.footer {
  background: var(--bg);
  color: #cbd5e1;
  padding: 1.3rem 0;
  text-align: center;
  font-size: 0.95rem;
}

@media (max-width: 1100px) {
  .author-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .cards,
  .project-link-cards {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3.5rem 0;
  }

  .hero {
    padding: 4rem 0 3.2rem;
  }
}

@media (max-width: 600px) {
  .hero-links {
    flex-direction: column;
    align-items: flex-start;
  }

  .button {
    width: 100%;
    text-align: center;
  }

  .section h2 {
    font-size: 1.7rem;
  }

  .author-cards {
    grid-template-columns: 1fr;
  }

  .author-photo {
    width: 140px;
    height: 140px;
  }

  .iele-logo {
    width: min(320px, 100%);
  }
}