.landing-page {
  min-height: 100vh;
  background: #f2f2f2;
  color: #222;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
  position: fixed;
  inset: 0;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 10;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
}

.top-bar {
  padding: 32px 48px 0;
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.nav-logo {
  font-size: 1rem;
  font-weight: 700;
  color: #999;
  letter-spacing: 0.05em;
}

.ad-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: #111;
  color: #fff;
  border-radius: 99px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
  letter-spacing: 0.02em;
}

.ad-btn:hover {
  background: #333;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.ad-dot {
  width: 6px;
  height: 6px;
  background: #f43f5e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

.hero-text {
  padding: 48px 48px 40px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  color: #111;
  margin: 0 0 14px;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.hero-desc {
  font-size: 1.05rem;
  color: #999;
  margin: 0;
  font-weight: 400;
  line-height: 1.6;
}

.papers {
  padding: 0 48px 64px;
}

.papers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.paper-card {
  cursor: pointer;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  transition: all 0.3s ease;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.paper-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.12);
}

.card-thumb {
  width: 100%;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  position: relative;
  background: #eaeaea;
}

.card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
  transition: transform 0.4s ease;
}

.paper-card:hover .card-thumb img {
  transform: scale(1.03);
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.paper-card:hover .card-overlay {
  opacity: 1;
}

.overlay-btn {
  padding: 12px 28px;
  background: #fff;
  color: #111;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
}

.card-bottom {
  padding: 16px 20px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.card-year {
  font-size: 1.4rem;
  font-weight: 900;
  color: #111;
}

.card-label {
  font-size: 0.78rem;
  color: #aaa;
  font-weight: 600;
}

.foot {
  text-align: center;
  padding: 24px 48px 32px;
}

.foot a {
  color: #bbb;
  font-size: 0.78rem;
  text-decoration: none;
}

.foot a:hover {
  color: #888;
}

@media (max-width: 900px) {
  .top-bar {
    padding: 24px 24px 0;
  }

  .hero-text {
    padding: 32px 24px 28px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .papers {
    padding: 0 24px 48px;
  }

  .papers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }
}

@media (max-width: 480px) {
  .top-bar {
    padding: 20px 20px 0;
  }

  .hero-text {
    padding: 24px 20px 20px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

  .hero-desc {
    font-size: 0.92rem;
  }

  .papers {
    padding: 0 20px 40px;
  }

  .papers-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .card-bottom {
    padding: 12px 14px;
  }

  .card-year {
    font-size: 1.15rem;
  }

  .foot {
    padding: 16px 20px 24px;
  }
}