@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700;800&display=swap');

* {
  margin: 0; 
  padding: 0; 
  box-sizing: border-box; 
  font-family: 'Poppins', sans-serif;
}

body {
  background: #050510;
  color: #fff;
  padding: 50px 20px;
}

h1, h2 {
  text-align: center;
  margin-bottom: 8px;
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  background: linear-gradient(90deg, #ff6a00, #ee0979, #8e2de2);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2, p.tagline {
  font-size: 1rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 1px;
}

p.tagline {
  text-align: center;
  margin: 15px 0 40px;
  font-size: 1.1rem;
}

.plans {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  max-width: 1100px;
  margin: 0 auto;
}

.card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 30px 25px;
  backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 35px rgba(238, 9, 121, 0.2);
  border-color: rgba(238, 9, 121, 0.4);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  font-weight: 700;
  background: linear-gradient(90deg, #ff6a00, #ee0979, #8e2de2);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

ul {
  list-style: none;
  margin-bottom: 25px;
}

ul li {
  margin: 12px 0;
  font-size: 0.95rem;
  color: rgba(255,255,255,0.8);
  position: relative;
  padding-left: 20px;
}

ul li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: #ee0979;
}

.price {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: auto;
  color: #fff;
  background: linear-gradient(135deg, rgba(255,106,0,0.15), rgba(238,9,121,0.15), rgba(142,45,226,0.15));
  border-radius: 12px;
  padding: 12px 15px;
  text-align: center;
  border: 1px solid rgba(238,9,121,0.25);
}

/* Zalo Button Sync */
.zalo-button {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #0088FF;
  color: white;
  padding: 12px 20px;
  border-radius: 50px;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 6px 20px rgba(0, 136, 255, 0.4);
  transition: all 0.3s ease;
  z-index: 1000;
  animation: bounce 2s infinite cubic-bezier(0.28, 0.84, 0.42, 1);
}

.zalo-button:hover {
  transform: scale(1.1);
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.zalo-button svg { flex-shrink: 0; }
.zalo-button span { white-space: nowrap; }

@media (max-width: 768px) {
  .zalo-button {
    bottom: 20px;
    right: 20px;
    padding: 10px 14px;
    font-size: 13px;
  }
  .plans { gap: 20px; }
  .card { padding: 25px 20px; }
}