* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: #f5f7fa;
  color: #1f2937;
  padding-bottom: 80px;
}

.hero {
  background: linear-gradient(135deg, #1e90ff, #63b3ff);
  color: white;
  text-align: center;
  padding: 42px 20px 36px;
  border-radius: 0 0 32px 32px;
}

.logo {
  width: 72px;
  height: 72px;
  margin: 0 auto 14px;
  background: white;
  color: #1e90ff;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 24px;
}

.hero h1 {
  margin: 0;
  font-size: 40px;
  letter-spacing: 1px;
}

.hero p {
  margin: 12px 0 10px;
  font-size: 16px;
  line-height: 1.7;
}

.copy {
  display: inline-block;
  margin-top: 8px;
  padding: 8px 14px;
  background: rgba(255,255,255,.18);
  border-radius: 999px;
  font-size: 13px;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 16px;
}

.card,
.partner-card {
  background: white;
  border-radius: 24px;
  padding: 22px;
  margin-bottom: 18px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .08);
}

.main-card h2 {
  margin: 10px 0 16px;
  font-size: 24px;
}

.label {
  color: #1e90ff;
  font-weight: 700;
  font-size: 15px;
}

.comic-box {
  height: 260px;
  border-radius: 20px;
  background: #eef6ff;
  border: 2px dashed #9ed0ff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #4b5563;
  margin: 16px 0;
}

.point {
  background: #f8fafc;
  border-left: 5px solid #1e90ff;
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 16px;
}

.point p {
  margin: 8px 0 0;
  line-height: 1.7;
}

.btn {
  display: inline-block;
  background: #1e90ff;
  color: white;
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 16px;
}

.tech-card {
  background: #f8fafc;
  border-radius: 18px;
  padding: 18px;
}

.tech-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.tech-card p {
  margin: 0;
  line-height: 1.6;
  color: #4b5563;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
}

.article-list li {
  padding: 13px 0;
  border-bottom: 1px solid #e5e7eb;
}

.article-list a {
  color: #1f2937;
  text-decoration: none;
  font-weight: 600;
}

.partner-card {
  display: flex;
  gap: 16px;
  align-items: center;
  background: #eef6ff;
}

.partner-icon {
  font-size: 42px;
}

.partner-card p {
  margin: 6px 0 0;
  line-height: 1.7;
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 68px;
  background: white;
  display: flex;
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -6px 20px rgba(15, 23, 42, .1);
  z-index: 100;
}

.bottom-nav a {
  color: #1f2937;
  text-decoration: none;
  font-size: 20px;
  text-align: center;
}

.bottom-nav span {
  display: block;
  font-size: 11px;
  margin-top: 2px;
}

@media (max-width: 700px) {
  .hero h1 {
    font-size: 34px;
  }

  .tech-grid {
    grid-template-columns: 1fr;
  }

  .comic-box {
    height: 220px;
  }
}