* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body, html {
  height: 100%;
  overflow: hidden;
}

/* Background Gradien Bergerak */
#particles-js {
  position: absolute;
  width: 100%;
  height: 100%;
  background: linear-gradient(-45deg, #70a1ff, #6c5ce7, #1e3799, #0c2461);
  background-size: 400% 400%;
  animation: gradientAnimation 12s ease infinite;
  z-index: 1;
}

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

/* Container Utama */
.main-container {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: #ffffff;
  padding: 20px;
  pointer-events: none;
}

.main-container * {
  pointer-events: auto;
}

/* Judul Utama SIADIL */
.app-title {
  font-size: 4rem;
  font-weight: 800;
  letter-spacing: 4px;
  margin-bottom: 0.2rem;
  line-height: 1;
  text-transform: uppercase;
  text-align: center;
  user-select: none;
  display: inline-block;

  /* Efek Warna Mengkilat dengan Gradient */
  background: linear-gradient(110deg, #ffffff 35%, #99f6ff 48%, #ffffff 55%, #ffffff 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;

  /* Shadow Dasar & Transisi Halus */
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.3));
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer; 
}

/* Hover State SIADIL: Timbul & Mengkilat */
.app-title:hover {
  transform: translateY(-8px) scale(1.05);
  
  animation: shineGlow 1.6s infinite linear;
}

@keyframes shineGlow {
  0% {
    background-position: 200% center;
  }
  100% {
    background-position: -200% center;
  }
}

/* Sub-judul di Bawah SIADIL */
.app-subtitle {
  font-size: 4rem;
  font-weight: 400;
  letter-spacing: 1.5px;
  margin-bottom: 4.5rem;
  text-align: center;
  opacity: 0.9;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  user-select: none;
}

/* Grid 3 Tombol Sejajar */
.button-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* Diubah menjadi 3 kolom */
  gap: 25px;
  width: 100%;
  max-width: 1000px; /* Disesuaikan agar 3 tombol tampak proporsional */
}

/* Styling Tombol Base */
.btn {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 220px;
  padding: 20px;
  text-decoration: none;
  text-transform: uppercase;
  border-radius: 16px;
  overflow: hidden;
}

.btn span {
  display: block;
  width: 100%;
  text-align: center;
  line-height: 1.3;
  margin: 0 auto;
  z-index: 2;
}

.btn-1 {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.35rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Animasi Garis Kiri (Left Border Indicator) */
.btn-1::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 6px;
  height: 100%;
  background: #ffffff;
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.8);
  z-index: 1;
}

/* Hover State Tombol */
.btn-1:hover {
  background: rgba(255, 255, 255, 0.22);
  letter-spacing: 0.5px;
  border-color: transparent;
  transform: translateY(-4px);
}

.btn-1:hover::before {
  transform: scaleY(1);
  transform-origin: top;
}

/* Responsif Layar Kecil */
@media (max-width: 900px) {
  .button-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }
  .btn {
    height: 140px;
  }
}

@media (max-width: 576px) {
  .app-title {
    font-size: 2.8rem;
    margin-bottom: 0.2rem;
  }
  .app-subtitle {
    font-size: 1rem;
    margin-bottom: 2.5rem;
  }
  .btn {
    height: 120px;
  }
}