* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f0f3f8;
  color: #2c3e50;
  display: flex;
  justify-content: center;
}

.app-container {
  width: 100%;
  max-width: 480px;
  min-height: 100vh;
  background-color: #ffffff;
  box-shadow: 0 0 15px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
}

/* Header Tema Indigo Modern */
.header {
  background: linear-gradient(135deg, #341f97, #5f27cd);
  color: white;
  text-align: center;
  padding: 20px 15px;
}

.header h1 {
  font-size: 1.4rem;
  margin-bottom: 5px;
}

.header p {
  font-size: 0.88rem;
  opacity: 0.95;
}

.nav-menu {
  display: flex;
  background-color: #eee9f8;
  border-bottom: 2px solid #dcd0ff;
}

.nav-btn {
  flex: 1;
  padding: 12px 2px;
  border: none;
  background: none;
  font-size: 0.88rem;
  font-weight: bold;
  color: #574b90;
  cursor: pointer;
  transition: 0.3s;
}

.nav-btn.active {
  background-color: #ffffff;
  color: #5f27cd;
  border-bottom: 3px solid #5f27cd;
}

.content {
  padding: 15px;
  flex: 1;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.card {
  background-color: #ffffff;
  border-radius: 12px;
  padding: 15px;
  margin-bottom: 15px;
  border: 1px solid #e1e8f0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.04);
}

.card h2 {
  font-size: 1.05rem;
  color: #5f27cd;
  margin-bottom: 10px;
}

/* Grid Materi 3 View */
.view-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.view-card {
  background-color: #f8f7fc;
  border-left: 4px solid #5f27cd;
  padding: 10px 12px;
  border-radius: 6px;
}

.view-card h3 {
  font-size: 0.95rem;
  color: #341f97;
  margin-bottom: 3px;
}

.view-card p {
  font-size: 0.85rem;
  line-height: 1.4;
}

.view-icon {
  font-size: 0.75rem;
  font-weight: bold;
  color: #5f27cd;
  background-color: #eee9f8;
  padding: 2px 6px;
  border-radius: 4px;
  float: right;
}

/* Object Selector */
.object-selector {
  display: flex;
  gap: 8px;
  margin: 10px 0;
}

.obj-btn {
  flex: 1;
  padding: 8px 5px;
  border: 1px solid #5f27cd;
  background-color: #fff;
  color: #5f27cd;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
}

.obj-btn.active {
  background-color: #5f27cd;
  color: white;
}

.sub-card {
  background-color: #f8f7fc;
  border: 1px solid #dcd0ff;
  border-radius: 8px;
  padding: 12px;
  margin: 10px 0;
}

/* Grid Control Lab */
.grid-controls {
  display: grid;
  grid-template-columns: 1flex 1flex;
  gap: 10px;
  margin: 12px 0;
}

.grid-cell {
  background-color: #f8f7fc;
  border: 1px solid #dcd0ff;
  padding: 8px;
  border-radius: 8px;
  text-align: center;
}

.grid-cell label {
  display: block;
  font-size: 0.78rem;
  font-weight: bold;
  color: #574b90;
  margin-bottom: 4px;
}

.grid-cell input {
  width: 100%;
  padding: 6px;
  border: 1px solid #b2bec3;
  border-radius: 4px;
  text-align: center;
  font-weight: bold;
}

/* Projection Display Box */
.result-box {
  background-color: #eee9f8;
  border-left: 4px solid #5f27cd;
  padding: 12px;
  border-radius: 6px;
  margin-top: 15px;
}

.result-box h3 {
  font-size: 0.95rem;
  color: #341f97;
  margin-bottom: 10px;
}

.projection-results {
  display: flex;
  justify-content: space-around;
  gap: 8px;
}

.proj-box {
  text-align: center;
}

.proj-box h4 {
  font-size: 0.8rem;
  color: #574b90;
  margin-bottom: 6px;
}

.grid-view {
  display: grid;
  grid-template-columns: repeat(2, 22px);
  grid-template-rows: repeat(2, 22px);
  gap: 2px;
  background-color: #2c3e50;
  padding: 3px;
  border-radius: 4px;
  justify-content: center;
}

.cell-block {
  width: 22px;
  height: 22px;
  background-color: #ecf0f1;
  border-radius: 2px;
}

.cell-block.active {
  background-color: #5f27cd;
}

.cell-block.active-sec {
  background-color: #10ac84;
}

/* Kuis Visual Box */
.quiz-visual-box {
  background-color: #f8f7fc;
  border: 1px dashed #5f27cd;
  border-radius: 8px;
  padding: 12px;
  margin: 10px 0;
  text-align: center;
}

.quiz-header {
  font-size: 0.85rem;
  color: #777;
  margin-bottom: 8px;
}

.question {
  font-weight: bold;
  font-size: 0.98rem;
  margin-bottom: 12px;
}

.options-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  padding: 12px;
  border: 1px solid #5f27cd;
  background-color: #fff;
  color: #5f27cd;
  border-radius: 8px;
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: 0.2s;
}

.option-btn.correct {
  background-color: #10ac84;
  color: white;
  border-color: #10ac84;
}

.option-btn.wrong {
  background-color: #ff6b6b;
  color: white;
  border-color: #ff6b6b;
}

.feedback {
  margin-top: 10px;
  font-weight: bold;
  text-align: center;
}

.action-btn {
  width: 100%;
  padding: 12px;
  margin-top: 15px;
  background-color: #5f27cd;
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  font-size: 0.98rem;
  cursor: pointer;
}

.score-box {
  text-align: center;
  font-size: 3rem;
  font-weight: bold;
  color: #10ac84;
  margin: 15px 0;
}