html { scroll-behavior: smooth; }
body {
  font-family: 'Poppins', sans-serif;
  color: #fff;
  text-align: center;
  margin: 0;
  padding: 20px;
  overflow-y: auto;
  min-height: 100vh;
  position: relative;
  background: radial-gradient(ellipse at bottom, #0d0d0d 0%, #1a1a2e 100%);
}

/* Latar bintang & nebula */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: url('https://files.catbox.moe/8ehu9n.jpg') repeat;
  background-size: cover;
  animation: starsMove 60s linear infinite;
  z-index: -2;
  opacity: 0.5;
}
body::after {
  content: '';
  position: fixed;
  top:0; left:0;
  width:100%; height:100%;
  background: radial-gradient(circle at 20% 30%, rgba(120,80,200,0.2), transparent 70%),
              radial-gradient(circle at 80% 70%, rgba(0,200,255,0.15), transparent 70%);
  z-index: -1;
  pointer-events: none;
}
@keyframes starsMove {
  0% { background-position: 0 0; }
  100% { background-position: -10000px 5000px; }
}

/* Judul */
h1 { font-size: 2.2em; font-weight: bold; margin:5px 0; letter-spacing:2px; color:#74b9ff; text-shadow: 0 0 15px #74b9ff, 0 0 30px #a29bfe; }
h2 { font-size: 1.3em; font-weight: normal; margin:5px 0; letter-spacing:2px; opacity:0.9; text-shadow:0 0 10px #a29bfe; }

/* Grid hari */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px; max-width: 900px; margin: 30px auto 50px; }

/* Kotak hari */
.day-box {
  background: rgba(20,20,40,0.5);
  border-radius: 20px;
  padding: 15px;
  color: #fff;
  position: relative;
  min-height: 50px;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 25px rgba(116,185,255,0.5), 0 0 50px rgba(162,155,254,0.3) inset;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid rgba(116,185,255,0.6);
  cursor: pointer;
}
.day-box:hover { transform: translateY(-6px) scale(1.02); box-shadow: 0 0 40px rgba(116,185,255,0.8), 0 0 60px rgba(162,155,254,0.5) inset; }

.day-title {
  background: linear-gradient(90deg, #74b9ff, #a29bfe);
  color: #000; padding: 6px 18px; border-radius: 12px; font-weight: bold;
  box-shadow: 0 0 20px rgba(116,185,255,0.8), 0 0 40px rgba(162,155,254,0.5) inset;
  display: flex; justify-content: space-between; align-items: center;
}

ul { list-style: none; padding: 0; margin-top: 25px; text-align: left;
  max-height: 0; overflow: hidden; transition: max-height 0.5s ease; }

li { background: rgba(162,155,254,0.2); margin: 5px 0; padding: 10px;
  border-radius: 8px; font-size: 0.95em; box-shadow: 0 0 10px rgba(116,185,255,0.3);
  transition: background 0.3s, box-shadow 0.3s; }
li:hover { background: rgba(116,185,255,0.35); color:#000; box-shadow:0 0 15px rgba(116,185,255,0.6); }
.istirahat { background-color: #FFD700; color: #000; font-weight:bold; }

/* Tombol */
.btn { display: inline-block; margin: 20px 10px; padding: 12px 25px;
  border-radius: 30px; font-weight: bold; text-decoration: none; font-size: 1em;
  transition: transform 0.3s, box-shadow 0.3s; }

.btn-instagram {
  background: linear-gradient(45deg, #feda75, #fa7e1e, #d62976, #962fbf, #4f5bd5);
  color: #fff; box-shadow: 0 0 20px rgba(255,0,100,0.6); }
.btn-instagram:hover { transform: scale(1.08); box-shadow: 0 0 35px rgba(255,0,150,0.8); }

.btn-guru {
  background: linear-gradient(45deg, #74b9ff, #a29bfe);
  color: #000; box-shadow: 0 0 20px rgba(116,185,255,0.6); }
.btn-guru:hover { transform: scale(1.08); box-shadow: 0 0 35px rgba(116,185,255,0.9); }

/* Panah toggle */
.arrow { margin-left: 10px; transition: transform 0.3s; }
.arrow.open { transform: rotate(180deg); }

/* Bubbles */
.bubbles { position: fixed; width: 100%; height: 100%; top: 0; left: 0; overflow: hidden; z-index: -1; }
.bubble { position: absolute; bottom: -100px; background: rgba(116,185,255,0.25);
  border-radius: 50%; animation: rise 15s infinite ease-in; box-shadow: 0 0 20px rgba(116,185,255,0.6); }
@keyframes rise {
  0% { transform: translateY(0) scale(1); opacity: 0.7; }
  100% { transform: translateY(-110vh) scale(1.5); opacity: 0; }
}