/* Panduan Matematika Styles */
body {
  background: url('../assets/bg3.jpg') center/cover fixed;
}
body::after {
  content: ''; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(26,26,46,0.88); z-index: -1;
}

.guide-container {
  max-width: 750px; margin: 0 auto; padding: 60px 16px 40px;
  position: relative; z-index: 1;
}

.guide-header {
  text-align: center; margin-bottom: 30px;
}
.guide-header h1 {
  font-family: 'Press Start 2P', monospace;
  font-size: clamp(1rem, 4vw, 1.8rem);
  background: linear-gradient(180deg, var(--poke-yellow), var(--poke-green));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.guide-header .subtitle { color: #aaa; margin-top: 8px; }

/* Grade tabs */
.grade-tabs {
  display: flex; gap: 10px; justify-content: center; margin-bottom: 24px;
}
.grade-tab {
  font-family: 'Nunito'; font-weight: 900; font-size: 1rem;
  padding: 10px 24px; border-radius: 50px; cursor: pointer;
  border: 3px solid #444; background: #2a2a4a; color: #aaa;
  transition: all 0.3s;
}
.grade-tab.active {
  border-color: var(--poke-yellow); color: var(--poke-yellow);
  background: rgba(255,203,5,0.1); box-shadow: 0 0 15px rgba(255,203,5,0.2);
}

/* Topic card */
.topic-card {
  background: linear-gradient(145deg, #2a2a4a, #1e1e3a);
  border: 2px solid #3a3a5a; border-radius: 16px;
  margin-bottom: 16px; overflow: hidden; transition: all 0.3s;
}
.topic-card:hover { border-color: var(--poke-yellow); }

.topic-header {
  padding: 16px 20px; cursor: pointer; display: flex;
  align-items: center; justify-content: space-between;
  user-select: none;
}
.topic-header h3 {
  font-size: 1.05rem; font-weight: 900; color: white; margin: 0;
}
.topic-header .topic-num {
  font-family: 'Press Start 2P', monospace; font-size: 0.6rem;
  color: var(--poke-yellow); margin-right: 10px; min-width: 24px;
}
.topic-header .arrow {
  font-size: 1.2rem; color: var(--poke-yellow);
  transition: transform 0.3s;
}
.topic-card.open .arrow { transform: rotate(180deg); }

.topic-body {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
  padding: 0 20px;
}
.topic-card.open .topic-body {
  max-height: 5000px; padding: 0 20px 20px;
}

/* Content styles */
.topic-body h4 {
  font-size: 1rem; color: var(--poke-yellow); margin: 16px 0 8px;
  font-family: 'Press Start 2P', monospace; font-size: 0.7rem;
}
.topic-body p, .topic-body li {
  color: #ccc; line-height: 1.7; font-size: 1rem;
}
.topic-body ul { padding-left: 20px; margin: 8px 0; }
.topic-body li { margin: 4px 0; }

/* Formula box */
.formula-box {
  background: linear-gradient(135deg, rgba(255,203,5,0.15), rgba(255,152,0,0.1));
  border: 2px solid var(--poke-yellow); border-radius: 12px;
  padding: 14px 18px; margin: 12px 0;
  font-size: 1.1rem; font-weight: 900; text-align: center;
  color: var(--poke-yellow);
}

/* Example box */
.example-box {
  background: rgba(59,76,202,0.15);
  border-left: 4px solid var(--poke-blue); border-radius: 0 12px 12px 0;
  padding: 14px 18px; margin: 12px 0;
}
.example-box .example-title {
  font-weight: 900; color: var(--poke-blue); font-size: 0.9rem; margin-bottom: 6px;
}
.example-box .step {
  color: #bbb; margin: 4px 0; font-size: 0.95rem;
}
.example-box .step strong { color: white; }
.example-box .answer {
  color: var(--poke-green); font-weight: 900; margin-top: 6px; font-size: 1.05rem;
}

/* Tips box */
.tips-box {
  background: rgba(76,175,80,0.1);
  border: 2px dashed var(--poke-green); border-radius: 12px;
  padding: 14px 18px; margin: 12px 0;
}
.tips-box .tips-title {
  font-weight: 900; color: var(--poke-green); margin-bottom: 6px;
}
.tips-box p, .tips-box li { color: #bbb; }

@media (max-width: 500px) {
  .topic-header h3 { font-size: 0.95rem; }
  .guide-container { padding: 60px 10px 30px; }
}