/* =============================================
   LEARNTIT — PAST PAPERS
   Page-specific styles for all past-papers index pages.
   Relies entirely on global.css for design tokens,
   reset, typography, container, and button system.
   ============================================= */

/* ----------------------------------------
   HERO
---------------------------------------- */
.past-papers-hero {
  background: var(--color-white);
  padding: 36px 0 32px;
}

.past-papers-breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.past-papers-breadcrumb a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.past-papers-breadcrumb a:hover {
  color: var(--color-primary);
  opacity: 1;
}

.past-papers-breadcrumb-sep {
  color: var(--color-border);
  font-size: 0.6rem;
}

.past-papers-breadcrumb span:last-child {
  color: var(--text-primary);
  font-weight: 500;
}

.past-papers-hero-title {
  margin-bottom: 22px;
  max-width: 1200px;
}

.past-papers-hero-desc {
  color: var(--text-secondary);
  margin-bottom: 22px;
  max-width: 560px;
}

.past-papers-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.past-papers-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-rounded);
  letter-spacing: 0.2px;
  line-height: 1.6;
}

.past-papers-pill.board   { background: var(--color-primary);    color: var(--color-white); }
.past-papers-pill.level   { background: var(--color-secondary);  color: var(--color-white); }
.past-papers-pill.tier    { background: var(--color-background);  color: var(--text-secondary); border: 1px solid var(--color-border); }
.past-papers-pill.subject { background: var(--color-primary-bg); color: var(--color-primary); }

/* ----------------------------------------
   STATS BAR
---------------------------------------- */
.past-papers-stats-bar {
  background: var(--color-white);
}

.past-papers-stats {
  display: flex;
  align-items: center;
  height: 68px;
}

.past-papers-stat {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-right: 32px;
  margin-right: 32px;
  border-right: 1px solid var(--color-border);
}

.past-papers-stat:last-child {
  border-right: none;
  padding-right: 0;
  margin-right: 0;
}

.past-papers-stat-icon {
  width: 38px;
  height: 38px;
  background: var(--color-primary-bg);
  border-radius: var(--radius-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.past-papers-stat-label {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.past-papers-stat-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  font-family: var(--font-heading);
}

/* ----------------------------------------
   PAPERS SECTION
---------------------------------------- */
.past-papers-section {
  background: var(--color-background);
  padding: 48px 0 80px;
}

.past-papers-session {
  margin-bottom: 52px;
}

.past-papers-session:last-child {
  margin-bottom: 0;
}

.past-papers-session-heading {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.past-papers-session-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* Grid */
.past-papers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.past-papers-grid--two {
  grid-template-columns: repeat(2, 1fr);
}

/* Card */
.past-papers-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-primary);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-medium), border-color var(--transition-fast);
}

.past-papers-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border-color: var(--color-primary);
}

.past-papers-card-head {
  padding: 16px 18px 14px;
  border-bottom: 1px solid var(--color-background);
}

.past-papers-card-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 8px;
}

.past-papers-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.past-papers-card-code {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.past-papers-calc-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-rounded);
  white-space: nowrap;
}

.past-papers-calc-badge.calc    { background: var(--accent-green-bg);  color: var(--accent-green); }
.past-papers-calc-badge.no-calc { background: var(--accent-orange-bg); color: var(--accent-orange); }

/* Card links */
.past-papers-card-links { flex: 1; }

.past-papers-card-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-primary);
  border-bottom: 1px solid var(--color-background);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.past-papers-card-link:last-child { border-bottom: none; }

.past-papers-card-link:hover {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  opacity: 1;
}

.past-papers-card-link:hover .past-papers-link-icon  { color: var(--color-primary); }
.past-papers-card-link:hover .past-papers-link-arrow { color: var(--color-primary); }

.past-papers-card-link-left {
  display: flex;
  align-items: center;
  gap: 9px;
}

.past-papers-link-icon  { font-size: 0.8rem;  color: var(--text-secondary); width: 14px; text-align: center; }
.past-papers-link-arrow { font-size: 0.6rem; color: var(--color-border); }

/* Card footer */
.past-papers-card-foot {
  padding: 10px 18px;
  background: var(--color-background);
  border-top: 1px solid var(--color-border);
  border-radius: 0 0 var(--radius-primary) var(--radius-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Mark tracker */
.past-papers-mark-tracker {
  display: flex;
  align-items: center;
  gap: 5px;
}

.past-papers-mark-input {
  width: 44px;
  height: 28px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-secondary);
  background: var(--color-white);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  padding: 0 4px;
  outline: none;
  transition: border-color var(--transition-fast);
  -moz-appearance: textfield;
  appearance: textfield;
}

.past-papers-mark-input::-webkit-outer-spin-button,
.past-papers-mark-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.past-papers-mark-input:focus { border-color: var(--color-primary); }

.past-papers-mark-total {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* Done (tick) button */
.past-papers-done-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--color-border);
  background: var(--color-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  flex-shrink: 0;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform 100ms ease;
}

.past-papers-done-btn:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.past-papers-done-btn:hover svg { color: var(--color-white); }
.past-papers-done-btn:active { transform: scale(0.90); }

.past-papers-done-btn svg {
  width: 13px;
  height: 13px;
  color: var(--color-border);
  flex-shrink: 0;
}

.past-papers-done-btn.done {
  background: var(--accent-green);
  border-color: var(--accent-green);
}

.past-papers-done-btn.done svg { color: var(--color-white); }

/* ----------------------------------------
   RESPONSIVE
---------------------------------------- */
@media (max-width: 900px) {
  .past-papers-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .past-papers-hero { padding: 24px 0 20px; }
  .past-papers-grid,
  .past-papers-grid--two { grid-template-columns: 1fr; max-width: 100%; }
  .past-papers-stats { height: auto; flex-direction: column; gap: 16px; padding: 16px 0; align-items: start;}
  .past-papers-stat  { border-right: none; padding-right: 0; margin-right: 0; }
}