body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: #233353;
  margin: 0;
  padding: 0;
  color: #ffffff;
}

header {
  background-color: white;
  padding: 20px;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header img {
  max-height: 60px;
}

.container {
  max-width: 1000px;
  margin: 40px auto;
  padding: 0 20px;
}

h1 {
  text-align: center;
  font-size: 2.2em;
  margin-bottom: 10px;
  color: #ffffff;
  font-weight: 500;
}

#notice {
  text-align: center;
  margin-bottom: 20px;
  font-size: 0.9em;
  color: #aaa;
}

.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}

.tool {
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  padding: 20px;
  width: 180px;
  text-align: center;
  transition: transform 0.2s ease-in-out;
  color: white;
  text-decoration: none;
  display: block;
}

.tool:hover {
  transform: translateY(-5px);
}

.tool img {
  width: 48px;
  height: 48px;
  margin-bottom: 10px;
  filter: brightness(0) invert(1);
}

.tool span {
  font-weight: bold;
  font-size: 1rem;
  display: block;
  margin-top: 8px;
}

/* Gradient options */
.g1 { background: linear-gradient(135deg, #00BACB, #30D690); }
.g2 { background: linear-gradient(135deg, #AD55A2, #F042BE); }
.g3 { background: linear-gradient(135deg, #FFF600, #FF981F); }
.g4 { background: linear-gradient(135deg, #FF981F, #F042BE); }
.g5 { background: linear-gradient(135deg, #00BACB, #AD55A2); }

footer {
  text-align: center;
  color: #bbb;
  font-size: 0.9em;
  margin-top: 60px;
  padding: 20px;
}