.join-page {
  padding-top: calc(var(--header-height) + 2rem);
  min-height: calc(100dvh - var(--header-height));
  background: var(--color-bg);
}

.hero-section {
  text-align: center;
  padding: 4rem 2rem 3.5rem;
  background: #f2f2f2;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.hero-section::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

.hero-section h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
  letter-spacing: 0;
}

.hero-section p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
  color: var(--color-text-light);
  line-height: 1.6;
}

.positions-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 2rem;
}

.position-card {
  background: #fff;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-small);
  transition: transform var(--transition-medium), box-shadow var(--transition-medium), border-color var(--transition-medium);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.position-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: rgba(0, 0, 0, 0.24);
}

.position-card.postdoc,
.position-card.phd,
.position-card.visiting { border-top: 5px solid #111; }

.position-content {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.position-content h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #000;
  position: relative;
  padding-bottom: 0.8rem;
}

.position-content h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background-color: currentColor;
}

.position-card.postdoc h2::after,
.position-card.phd h2::after,
.position-card.visiting h2::after { background-color: #111; }

.position-content p {
  margin-bottom: 1.2rem;
  line-height: 1.6;
  color: #333;
}

.position-content ul {
  list-style: none;
  padding-left: 1rem;
  margin-bottom: 1.5rem;
}

.position-content ul li {
  margin-bottom: 0.5rem;
  position: relative;
  line-height: 1.4;
}

.position-content ul li:before {
  content: "•";
  color: #000;
  font-weight: bold;
  position: absolute;
  left: -1rem;
}

.position-card.postdoc ul li:before,
.position-card.phd ul li:before,
.position-card.visiting ul li:before { color: #111; }

.requirements {
  font-weight: 600;
  margin: 1rem 0 0.5rem;
  font-size: 1.1rem;
}

.link-emphasis {
  text-decoration: underline;
  font-weight: 600;
  color: #000;
  transition: opacity 0.3s;
}

.link-emphasis:hover {
  opacity: 0.7;
}

@media (max-width: 768px) {
  .positions-section { grid-template-columns: 1fr; padding: 2rem 1rem; }
  .hero-section { padding: 2rem 1rem; }
  .hero-section h1 { font-size: 2rem; }
  .hero-section p { font-size: 1rem; }
  .position-content { padding: 1.5rem; }
  .position-content h2 { font-size: 1.3rem; }
}

@media (max-width: 480px) {
  .hero-section { padding: 1.5rem 1rem; }
  .positions-section { gap: 1.5rem; padding: 1.5rem 1rem; }
  .position-content { padding: 1.2rem; }
  .position-content ul { padding-left: 0.8rem; }
  .position-content ul li:before { left: -0.8rem; }
}