* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, "Microsoft YaHei", sans-serif;
  background: #eef3f7;
  color: #222;
  transition: background 0.3s ease, color 0.3s ease;
}

.hero {
  min-height: 62vh;
  background: linear-gradient(135deg, #79b88f 0%, #7aa7d8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 70px 20px 110px;
}

.overlay {
  max-width: 820px;
  color: white;
}

.hero h1 {
  margin: 0 0 18px;
  font-size: 60px;
  line-height: 1.15;
  font-weight: 700;
}

.hero p {
  margin: 0 auto 30px;
  max-width: 720px;
  font-size: 20px;
  line-height: 1.9;
  opacity: 0.96;
}

.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

button {
  border: none;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 17px;
  cursor: pointer;
  background: white;
  color: #2f7d50;
  font-weight: bold;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  transition: transform 0.18s ease, opacity 0.18s ease, box-shadow 0.18s ease;
}

button:hover {
  transform: translateY(-2px);
  opacity: 0.95;
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.16);
}

button.secondary {
  background: rgba(255, 255, 255, 0.18);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: none;
}

.container {
  width: min(1120px, 92%);
  margin: -70px auto 48px;
}

.card {
  background: rgba(255, 255, 255, 0.96);
  border-radius: 28px;
  padding: 34px 32px;
  box-shadow: 0 14px 34px rgba(42, 59, 86, 0.1);
  margin-bottom: 26px;
  backdrop-filter: blur(6px);
}

.intro {
  text-align: center;
}

.card h2 {
  margin-top: 0;
  margin-bottom: 14px;
  font-size: 34px;
  color: #1f2b3a;
}

.card p {
  color: #5d6674;
  line-height: 1.95;
  font-size: 18px;
  margin: 0;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-bottom: 26px;
}

.feature-card {
  background: rgba(255, 255, 255, 0.96);
  border-radius: 24px;
  padding: 28px 24px;
  box-shadow: 0 12px 28px rgba(42, 59, 86, 0.08);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(42, 59, 86, 0.12);
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  font-size: 24px;
  color: #253244;
}

.feature-card p {
  margin: 0;
  color: #66707f;
  line-height: 1.9;
  font-size: 17px;
}

.status {
  text-align: center;
}

.status #statusText {
  color: #2f7d50;
  font-weight: bold;
  font-size: 22px;
  margin-top: 8px;
}

.footer {
  text-align: center;
  padding: 10px 16px 38px;
  color: #6c7685;
  font-size: 15px;
}

.dark-mode {
  background: #141922;
  color: #f2f4f8;
}

.dark-mode .hero {
  background: linear-gradient(135deg, #324a5f 0%, #293445 100%);
}

.dark-mode .card,
.dark-mode .feature-card {
  background: #1f2632;
  color: #f2f4f8;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
}

.dark-mode .card h2,
.dark-mode .feature-card h3 {
  color: #f3f6fb;
}

.dark-mode .card p,
.dark-mode .feature-card p,
.dark-mode .footer {
  color: #c4ccda;
}

.dark-mode .status #statusText {
  color: #7edca0;
}

@media (max-width: 900px) {
  .hero {
    min-height: auto;
    padding: 56px 18px 90px;
  }

  .hero h1 {
    font-size: 42px;
  }

  .hero p {
    font-size: 17px;
  }

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

  .container {
    margin-top: -50px;
  }

  .card,
  .feature-card {
    padding: 24px 20px;
  }

  .card h2 {
    font-size: 28px;
  }
}