body {
  margin: 0;
  font-family: Arial, sans-serif;
  text-align: center;
  color: #111827;

  background: linear-gradient(rgba(15,23,42,0.8), rgba(30,58,138,0.8)),
              url('https://images.unsplash.com/photo-1555066931-4365d14bab8c');

  background-size: cover;
  background-position: center;
}

@keyframes gradientBG {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

header {
  padding: 55px 20px 30px;
}

h1 {
  margin: 0;
  font-size: 48px;
  color: #0f172a;
}

p {
  color: #475569;
  font-size: 18px;
}

.tools {
  max-width: 1100px;
  margin: 30px auto;
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 22px;
}

button {
  height: 80px;
  border: none;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.85);
  color: #1e293b;
  font-size: 17px;
  font-weight: bold;
  cursor: pointer;
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  transition: 0.3s;
}

button:hover {
  transform: translateY(-6px);
  color: white;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  box-shadow: 0 18px 35px rgba(37, 99, 235, 0.35);
}
footer {
  margin-top: 40px;
  padding: 25px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(8px);
  color: #334155;
}

footer a {
  color: #2563eb;
  text-decoration: none;
  font-weight: bold;
}

footer a:hover {
  text-decoration: underline;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 30px;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(10px);
}

.navbar a {
  margin-left: 20px;
  text-decoration: none;
  color: #1e293b;
  font-weight: bold;
}
h1 {
  color: white;
}

p {
  color: #e2e8f0;
}
button {
  color: #1e293b;
  font-weight: bold;
}
.logo {
  font-size: 50px;
  font-weight: bold;
  color: white;
  text-shadow: 0 0 10px #60a5fa, 0 0 20px #3b82f6;
}
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  color: white;
}

.navbar h2 {
  color: white;
}

.navbar a {
  color: white;
}

.navbar a:hover {
  color: #93c5fd;
}
button:hover {
  transform: translateY(-6px) scale(1.03);
  color: white;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  box-shadow: 0 0 18px rgba(96, 165, 250, 0.8);
}
button:active {
  transform: scale(0.95);
}
.recommend-section {
  max-width: 900px;
  margin: 40px auto;
  padding: 30px;
  text-align: center;
  background: rgba(15, 23, 42, 0.65);
  border-radius: 24px;
  backdrop-filter: blur(10px);
}

.recommend-section h2 {
  color: white;
  margin-bottom: 20px;
}

.recommend-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
}

.recommend-buttons a {
  text-decoration: none;
}