:root {
  --pink: #ff9eb5;
  --pink-dark: #ff84a0;
  --purple: #9b8fff;
  --purple-dark: #867aff;
  --blue: #a2d2ff;
  --text: #403e57;
  --bg: #fdfbff;
  --muted: #8a88a6;
}

* { box-sizing: border-box; }
body {
  font-family: "Poppins", system-ui, sans-serif;
  background: linear-gradient(160deg, #fff6fb 0%, #f2f0ff 100%);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 32px;
  min-height: 100vh;
}

.card {
  width: 100%;
  max-width: 800px;
  background: rgba(255,255,255,0.9);
  border-radius: 32px;
  box-shadow: 0 10px 40px rgba(150,130,255,0.15);
  padding: 48px;
  text-align: center;
  backdrop-filter: blur(12px);
  border: 3px solid rgba(150,130,255,0.1);
  animation: pop 0.6s ease;
}

@keyframes pop {
  from { transform: scale(0.96); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

h1 {
  font-size: 38px;
  margin: 0;
  font-weight: 700;
  background: linear-gradient(90deg, var(--purple), var(--pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

p.sub {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 28px;
}

textarea {
  width: 100%;
  min-height: 130px;
  border-radius: 20px;
  border: 2px solid rgba(150,130,255,0.2);
  background: rgba(255,255,255,0.6);
  padding: 14px 16px;
  font-size: 15px;
  resize: vertical;
  transition: border-color 0.2s, background 0.2s;
}

textarea:focus {
  outline: none;
  border-color: var(--purple);
  background: rgba(255,255,255,0.95);
}

.btns {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

button {
  border: none;
  border-radius: 999px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

/* Encode (pink pastel) */
#encodeBtn {
  background: var(--pink);
  color: #fff;
}
#encodeBtn:hover { background: var(--pink-dark); transform: translateY(-2px); }

/* Decode (purple pastel) */
#decodeBtn {
  background: var(--purple);
  color: #fff;
}
#decodeBtn:hover { background: var(--purple-dark); transform: translateY(-2px); }

/* Tombol nonaktif */
.inactive {
  background: rgba(230,230,240,0.6) !important;
  color: var(--muted) !important;
  box-shadow: none !important;
  transform: none !important;
}

/* Ghost buttons */
button.ghost {
  background: rgba(255,255,255,0.6);
  border: 1.5px solid rgba(150,130,255,0.15);
  color: var(--text);
}
button.ghost:hover {
  background: rgba(150,130,255,0.08);
  transform: translateY(-2px);
}

.output {
  margin-top: 24px;
  background: rgba(255,255,255,0.85);
  border-radius: 20px;
  border: 1.5px solid rgba(150,130,255,0.15);
  padding: 16px;
  font-family: "JetBrains Mono", monospace;
  font-size: 14px;
  text-align: left;
  min-height: 100px;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
  color: var(--text);
  transition: background 0.3s ease;
}

.output.fade {
  animation: fade 0.4s ease;
}

@keyframes fade {
  from { opacity: 0.4; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

footer {
  margin-top: 30px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 640px) {
  .card { padding: 28px; border-radius: 24px; }
  h1 { font-size: 30px; }
}