/* ── Required Practicals styles ──────────────────────────────────────────── */

.prac-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Hero */
.prac-hero {
  text-align: center;
  padding: 2.5rem 0 2rem;
}
.prac-hero-title {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}
.prac-hero-sub {
  font-size: 1.05rem;
  color: var(--color-text-medium);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Breadcrumb */
.prac-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: var(--color-text-medium);
  margin-bottom: 1.5rem;
}
.prac-breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}
.prac-breadcrumb a:hover { text-decoration: underline; }
.prac-bc-sep { color: var(--color-border); }

/* Board grid (hub) */
.prac-board-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.prac-board-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition-speed), transform var(--transition-speed);
}
.prac-board-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.1);
  transform: translateY(-2px);
}
.prac-board-badge {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.25rem 0.7rem;
  border-radius: 4px;
  width: fit-content;
}
.prac-board-badge.edexcel { background: #1a5276; }
.prac-board-badge.ocra    { background: #1e8449; }
.prac-board-count {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-text-dark);
}
.prac-board-desc {
  font-size: 0.93rem;
  color: var(--color-text-medium);
  line-height: 1.55;
  flex: 1;
}
.prac-board-cta {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 0.25rem;
}
.prac-hub-footer {
  text-align: center;
  color: var(--color-text-medium);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
}

/* List page */
.prac-list-header {
  margin-bottom: 2rem;
}
.prac-list-header h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: 0.4rem;
}
.prac-list-sub {
  color: var(--color-text-medium);
  margin-bottom: 1rem;
}
.prac-search {
  width: 100%;
  max-width: 420px;
  padding: 0.65rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-size: 0.95rem;
  background: var(--color-card-background);
  color: var(--color-text-dark);
}
.prac-search:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(92,107,192,0.15);
}

.prac-topic-section { margin-bottom: 2.5rem; }
.prac-topic-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-border);
}

.prac-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1rem;
}
.prac-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition-speed), border-color var(--transition-speed);
}
.prac-card:hover {
  box-shadow: 0 4px 14px rgba(0,0,0,0.08);
  border-color: var(--color-primary);
}
.prac-card-top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.prac-card-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
}
.prac-card-num.large {
  width: 36px;
  height: 36px;
  font-size: 0.95rem;
}
.prac-card-level {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
}
.prac-card-level.large { font-size: 0.85rem; padding: 0.25rem 0.65rem; }
.level-as  { background: #e8f4fd; color: #1a6fa0; }
.level-a2  { background: #fdebd0; color: #a04010; }
html[data-theme='dark'] .level-as  { background: #1a3a50; color: #7ec8e3; }
html[data-theme='dark'] .level-a2  { background: #4a2800; color: #e8a060; }

.prac-card-title {
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--color-text-dark);
  line-height: 1.35;
}
.prac-card-summary {
  font-size: 0.85rem;
  color: var(--color-text-medium);
  line-height: 1.45;
  flex: 1;
}
.prac-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.25rem;
}
.prac-card-ref {
  font-size: 0.78rem;
  color: var(--color-text-light);
  font-family: monospace;
}
.prac-card-qs {
  font-size: 0.78rem;
  color: var(--color-primary);
  font-weight: 600;
}

.prac-no-results {
  text-align: center;
  color: var(--color-text-medium);
  padding: 3rem 0;
}

/* Detail page */
.prac-detail-header {
  margin-bottom: 1.75rem;
}
.prac-detail-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}
.prac-detail-ref {
  font-size: 0.82rem;
  color: var(--color-text-light);
  font-family: monospace;
}
.prac-detail-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-text-dark);
  line-height: 1.25;
  margin-bottom: 0.6rem;
}
.prac-detail-summary {
  font-size: 1rem;
  color: var(--color-text-medium);
  line-height: 1.6;
}

/* Tabs */
.prac-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: 1.75rem;
}
.prac-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  padding: 0.65rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-medium);
  cursor: pointer;
  transition: color var(--transition-speed), border-color var(--transition-speed);
}
.prac-tab:hover { color: var(--color-primary); }
.prac-tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  font-weight: 700;
}
.prac-tab-content { display: none; }
.prac-tab-content.active { display: block; }

/* Two-column layout for apparatus + safety */
.prac-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 640px) {
  .prac-two-col { grid-template-columns: 1fr; }
}

/* Sections */
.prac-section {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}
.prac-section-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.prac-section-heading i { font-size: 0.9rem; }

.prac-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.prac-list li {
  font-size: 0.93rem;
  color: var(--color-text-dark);
  line-height: 1.5;
  padding-left: 1.25rem;
  position: relative;
}
.prac-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.6;
}
.safety-list li::before { background: #e74c3c; }
.analysis-list li::before { background: var(--color-accent); }
.error-list li::before { background: #e67e22; }

.prac-method-list {
  padding-left: 1.4rem;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.prac-method-list li {
  font-size: 0.93rem;
  color: var(--color-text-dark);
  line-height: 1.5;
}

/* Key variables */
.prac-variables {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.prac-var-row {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.prac-var-label {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  white-space: nowrap;
  min-width: 90px;
  text-align: center;
}
.prac-var-label.independent { background: #eaf4ff; color: #1a6fa0; }
.prac-var-label.dependent   { background: #f3e8ff; color: #7b2d8b; }
.prac-var-label.controlled  { background: #e8f8ee; color: #1e7a40; }
html[data-theme='dark'] .prac-var-label.independent { background: #1a3a50; color: #7ec8e3; }
html[data-theme='dark'] .prac-var-label.dependent   { background: #3a1a50; color: #c07ae3; }
html[data-theme='dark'] .prac-var-label.controlled  { background: #1a3a28; color: #7ae3a0; }
.prac-var-value {
  font-size: 0.91rem;
  color: var(--color-text-dark);
  line-height: 1.45;
}

/* Questions */
.prac-qs-intro {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 0.9rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-medium);
  margin-bottom: 1.5rem;
}
.prac-question {
  background: var(--color-card-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}
.prac-q-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.prac-q-num {
  font-size: 0.82rem;
  font-weight: 700;
  background: var(--color-primary);
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
}
.prac-q-marks {
  font-size: 0.82rem;
  color: var(--color-text-light);
  font-style: italic;
}
.prac-q-text {
  font-size: 0.97rem;
  color: var(--color-text-dark);
  line-height: 1.6;
  margin-bottom: 1rem;
}
.prac-ms-toggle {
  background: none;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--border-radius);
  padding: 0.45rem 1rem;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-speed), color var(--transition-speed);
}
.prac-ms-toggle:hover {
  background: var(--color-primary);
  color: #fff;
}
.prac-ms {
  margin-top: 1rem;
  background: rgba(92,107,192,0.06);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: 0.9rem 1.1rem;
}
.prac-ms ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.prac-ms li {
  font-size: 0.9rem;
  color: var(--color-text-dark);
  line-height: 1.5;
  padding-left: 1.2rem;
  position: relative;
}
.prac-ms li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 4px 0 4px 6px;
  border-color: transparent transparent transparent var(--color-primary);
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 600px) {
  .prac-hero-title { font-size: 1.8rem; }
  .prac-detail-title { font-size: 1.4rem; }
  .prac-tab { padding: 0.55rem 0.8rem; font-size: 0.88rem; }
  .prac-section { padding: 1rem; }
}