/* ------------------------------
   ROOT COLORS & FONTS
------------------------------*/
:root {
  --green: #77d37a;
  --green-dark: #4fb454;
  --lemon: #ffe97a;
  --white: #ffffff;
  --text: #333;
  --soft-shadow: 0 4px 12px rgba(0,0,0,0.1);
  --radius: 18px;
  font-family: "Nunito", sans-serif;
}

body {
  margin: 0;
  background: #f5fff5;
  color: var(--text);
}

/* ------------------------------
   HEADER
------------------------------*/
.app-header {
  text-align: center;
  padding: 20px 10px;
}

.title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--green-dark);
}

.subtitle {
  margin-top: -6px;
  opacity: 0.8;
}

/* ------------------------------
   MODE CARDS
------------------------------*/
.mode-section {
  padding: 20px;
  text-align: center;
}

.mode-grid {
  display: grid;
  gap: 15px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  padding: 10px;
}

.mode-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--soft-shadow);
  transition: transform .2s, box-shadow .2s;
  cursor: pointer;
}

.mode-card:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 18px rgba(0,0,0,0.15);
}

.mode-card.active {
  border: 3px solid var(--lemon);
  box-shadow: 0 0 20px rgba(255,240,150,0.6);
}

.icon {
  font-size: 2rem;
}

/* ------------------------------
   GENERATOR
------------------------------*/
.generator {
  padding: 20px;
  text-align: center;
}

#userPrompt {
  width: 90%;
  height: 80px;
  padding: 15px;
  border-radius: var(--radius);
  border: 2px solid var(--green);
  font-size: 1rem;
  outline: none;
}

.generate-btn {
  margin-top: 10px;
  background: var(--green);
  border: none;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 1.2rem;
  color: var(--white);
  cursor: pointer;
  transition: background .2s;
}

.generate-btn:hover {
  background: var(--green-dark);
}

/* ------------------------------
   LOADING ANIMATION
------------------------------*/
.loading {
  margin: 20px auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 6px solid #d8ffd8;
  border-top-color: var(--green);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ------------------------------
   OUTPUT SECTION
------------------------------*/
.output-section {
  padding: 20px;
}

#output {
  margin-top: 20px;
  background: var(--white);
  padding: 20px;
  border-radius: var(--radius);
  box-shadow: var(--soft-shadow);
}

/* Scratch block styling */
.block {
  padding: 10px 15px;
  border-radius: 12px;
  margin: 6px 0;
  color: white;
  font-weight: bold;
}

.motion { background: #4c97ff; }
.events { background: #ffbf00; }
.looks { background: #9966ff; }
.control { background: #ffab19; }
.sensing { background: #5cd1d8; }

.indent {
  margin-left: 20px;
}

/* Progress bar */
.progress {
  margin-bottom: 15px;
  width: 100%;
}

#progressBar {
  width: 0%;
  height: 10px;
  background: var(--green-dark);
  border-radius: 10px;
}

/* Buttons */
.save-btn, .read-btn {
  margin: 10px 5px;
  padding: 10px 15px;
  font-size: 1rem;
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--soft-shadow);
}

.save-btn { background: var(--lemon); }
.read-btn { background: var(--green); color: white; }

/* ------------------------------
   SHELF
------------------------------*/
.shelf {
  padding: 10px;
  display: grid;
  gap: 15px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.shelf-item {
  padding: 15px;
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--soft-shadow);
}

/* ------------------------------
   PWA INSTALL
------------------------------*/
.pwa-banner {
  background: var(--lemon);
  padding: 10px;
  position: fixed;
  bottom: 0;
  width: 100%;
  box-shadow: var(--soft-shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.floating-install {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--green-dark);
  color: white;
  padding: 12px;
  border-radius: 50%;
  box-shadow: var(--soft-shadow);
  border: none;
  font-size: 1.1rem;
}

/* Utility */
.hidden { display: none; }
.fade-in { animation: fade 0.6s ease-in-out; }

@keyframes fade {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}