:root {
  --teal: #1b5f76;
  --teal-dark: #14495c;
  --ink: #14181c;
  --bg: #ffffff;
  --muted: #4b5563;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
}

.hub {
  max-width: 1000px;
  margin: 0 auto;
  padding: 64px 24px 40px;
  text-align: center;
}

.hub-header h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  margin: 0 0 12px;
  letter-spacing: -0.5px;
}

.tagline {
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 40px;
}

.portrait-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 48px;
}

.portrait {
  position: relative;
  width: 140px;
  height: 140px;
}

.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--teal);
}

.portrait-fallback {
  display: none;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 2px dashed #b7c2c8;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 8px;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.pillar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 96px;
  background: var(--teal);
  color: #ffffff;
  text-decoration: none;
  font-size: 1.15rem;
  font-weight: 600;
  border-radius: 14px;
  padding: 20px;
  transition: transform 0.15s ease, background 0.15s ease;
  box-shadow: 0 2px 6px rgba(20, 24, 28, 0.15);
}

.pillar-btn:hover,
.pillar-btn:focus-visible {
  background: var(--teal-dark);
  transform: translateY(-2px);
}

.pillar-btn:focus-visible {
  outline: 3px solid #7fb8cc;
  outline-offset: 2px;
}

.hub-footer {
  margin-top: 56px;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 700px) {
  .pillars {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 460px) {
  .pillars {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .pillar-btn {
    transition: none;
  }
}