:root {
  --biru: #007bff;
  --biru-tua: #0056b3;
  --putih: #ffffff;
  --abu: #f5f5f5;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', sans-serif;
  background: var(--abu);
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--putih);
  border-bottom: 3px solid var(--biru);
  padding: 15px 20px;
}

.logo {
  font-size: 28px;
  font-weight: bold;
  color: var(--biru);
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.konten {
  text-align: center;
  background: var(--putih);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  max-width: 500px;
  width: 100%;
}

.konten h2 {
  margin-bottom: 20px;
  font-size: 22px;
  color: var(--biru-tua);
}

.tool-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.tool-list a {
  padding: 12px 20px;
  font-size: 16px;
  border-radius: 8px;
  background: var(--biru);
  color: var(--putih);
  text-decoration: none;
  font-weight: 500;
  transition: 0.3s ease;
}

.tool-list a:hover {
  background: var(--biru-tua);
  transform: scale(1.05);
}

footer {
  background: var(--putih);
  padding: 10px;
  text-align: center;
  font-size: 14px;
  border-top: 1px solid #ddd;
}

@media (max-width: 500px) {
  .konten {
    padding: 20px;
  }
  .logo {
    font-size: 24px;
  }
}