/* Raspberry Pi course — page-specific accents on top of oop-java-course.css base */

.hw-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 22px 0; }
.hw-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  border-top: 3px solid var(--accent, var(--accent3));
  transition: transform 0.2s;
}
.hw-card:hover { transform: translateY(-4px); }
.hw-card .hw-icon { font-size: 2rem; margin-bottom: 10px; }
.hw-card h4 { font-family: 'Fredoka One', cursive; font-size: 1.05rem; margin-bottom: 6px; }
.hw-card p { font-size: 0.87rem; color: var(--muted); }

/* Breadboard visual */
.breadboard-diagram {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  margin: 18px 0;
  overflow-x: auto;
  font-family: 'Fira Code', monospace;
  font-size: 0.82rem;
  line-height: 1.9;
  white-space: pre;
}
.breadboard-diagram .rail-pos { color: #ff6b6b; }
.breadboard-diagram .rail-neg { color: #118ab2; }
.breadboard-diagram .strip { color: #06d6a0; }
.breadboard-diagram .gap { color: #5a5880; }
.breadboard-diagram .label { color: #ffd166; }

/* Resistor color band chips */
.band-row { display: flex; align-items: center; gap: 10px; margin: 8px 0; font-size: 0.92rem; }
.band-chip { width: 22px; height: 22px; border-radius: 4px; flex-shrink: 0; border: 1px solid rgba(255,255,255,0.2); }


/* Course 01 series polish */
.course-meta-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 20px auto 0;
  max-width: 960px;
}
.course-meta-strip span {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}
.header-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.header-actions a {
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 14px;
  color: var(--text, #fff);
  background: rgba(255,255,255,0.06);
  font-weight: 900;
  font-size: 0.86rem;
}
.header-actions a:hover { transform: translateY(-2px); }
.mobile-lesson-jump {
  width: min(1100px, calc(100% - 28px));
  margin: 14px auto 0;
  display: none;
  gap: 8px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  padding: 10px;
}
.mobile-lesson-jump label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  white-space: nowrap;
}
.mobile-lesson-jump select {
  flex: 1;
  min-width: 0;
  background: var(--code-bg);
  color: var(--text, #fff);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-weight: 800;
}
.course-overview-panel {
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(229,57,53,.12), rgba(6,214,160,.06));
  border-radius: 18px;
  padding: 24px;
  margin-bottom: 22px;
}
.course-overview-panel h2 {
  font-family: 'Fredoka One', cursive;
  margin: 8px 0 10px;
}
.course-overview-panel p { color: var(--muted); line-height: 1.7; }
.overview-eyebrow {
  color: #06d6a0;
  font-family: 'Fira Code', monospace;
  font-size: 0.78rem;
  font-weight: 800;
}
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.overview-grid div {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  background: rgba(0,0,0,.16);
}
.overview-grid strong { display: block; margin-bottom: 6px; }
.overview-grid span { display: block; color: var(--muted); font-size: .88rem; line-height: 1.55; }
@media (max-width: 860px) {
  .mobile-lesson-jump { display: flex; }
  .sidebar { display: none; }
}
@media (max-width: 560px) {
  .mobile-lesson-jump { align-items: stretch; flex-direction: column; }
  .course-meta-strip span { width: 100%; text-align: center; }
}