/* ═══════════════════════════════════════
   COMPETITIVE PROGRAMMING + CHALLENGE WALL
   ═══════════════════════════════════════ */

/* ── Intro ── */
.cp-intro {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.9;
  margin-bottom: 2.5rem;
  max-width: 700px;
  border-left: 2px solid var(--neon3);
  padding-left: 1.5rem;
}

/* ── Platform badges ── */
.cp-platforms {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.cp-platform {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--border);
  color: var(--text);
  letter-spacing: 1.5px;
  text-decoration: none;
  background: var(--card);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.cp-platform:hover {
  border-color: var(--neon3);
  color: var(--neon3);
  box-shadow: var(--glow-green);
  transform: translateY(-2px);
}

/* ── Stats row ── */
.cp-stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.cp-stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1.2rem 1.5rem;
  text-align: center;
  transition: border-color var(--transition);
}
.cp-stat-card:hover { border-color: var(--neon3); }

.cp-stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--neon3);
  text-shadow: var(--glow-green);
  display: block;
}
.cp-stat-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 2px;
  margin-top: 0.3rem;
}

/* ── Challenge Wall ── */
.challenge-wall-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.challenge-wall-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: #fff;
}

.challenge-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.35rem 0.8rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: none;
  letter-spacing: 1px;
  transition: all var(--transition);
}
.filter-btn:hover,
.filter-btn.active {
  border-color: var(--neon3);
  color: var(--neon3);
  background: rgba(0,255,136,0.07);
}
.filter-btn[data-diff="easy"].active   { border-color: var(--neon3); color: var(--neon3); }
.filter-btn[data-diff="medium"].active { border-color: var(--neon-warn); color: var(--neon-warn); }
.filter-btn[data-diff="hard"].active   { border-color: #ff4466; color: #ff4466; }

.challenge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.challenge-card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 1.4rem;
  position: relative;
  transition: border-color var(--transition), transform var(--transition);
  backdrop-filter: blur(10px);
}

.challenge-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0,255,136,0.3);
}

.challenge-card.hidden { display: none; }

.challenge-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.7rem;
}

.difficulty-badge {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  padding: 0.18rem 0.5rem;
  letter-spacing: 1.5px;
  border: 1px solid;
}
.difficulty-badge.easy   { color: var(--neon3);     border-color: rgba(0,255,136,0.4);  background: rgba(0,255,136,0.07); }
.difficulty-badge.medium { color: var(--neon-warn); border-color: rgba(255,179,0,0.4);  background: rgba(255,179,0,0.07); }
.difficulty-badge.hard   { color: #ff4466;           border-color: rgba(255,68,102,0.4); background: rgba(255,68,102,0.07); }

.challenge-topic {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--muted);
  letter-spacing: 1px;
}

.challenge-name {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: #fff;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.challenge-platform {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.challenge-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.challenge-attempts {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--muted);
  letter-spacing: 0.5px;
}
.challenge-attempts span {
  color: var(--neon3);
  font-weight: bold;
}

.challenge-try-btn {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.35rem 0.9rem;
  color: var(--neon3);
  border: 1px solid rgba(0,255,136,0.4);
  background: transparent;
  cursor: none;
  text-decoration: none;
  letter-spacing: 1px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.challenge-try-btn::before {
  content: '';
  position: absolute; inset: 0;
  background: var(--neon3);
  transform: translateX(-100%);
  transition: transform var(--transition);
  z-index: -1;
}
.challenge-try-btn:hover { color: var(--bg); }
.challenge-try-btn:hover::before { transform: translateX(0); }

.challenge-wall-footer {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 1px;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
  .challenge-filters {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.5rem;
    -webkit-overflow-scrolling: touch;
  }
  .challenge-wall-header { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 600px) {
  .challenge-grid { grid-template-columns: 1fr; }
  .cp-stats-row { grid-template-columns: repeat(2, 1fr); }
}


/* ── Pagination ── */
#challenge-pagination {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.page-info {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 1px;
}

.page-btns {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
}

.page-btn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.35rem 0.9rem;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: none;
  letter-spacing: 1px;
  transition: all var(--transition);
}
.page-btn:hover:not(:disabled) {
  border-color: var(--neon3);
  color: var(--neon3);
}
.page-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.page-pill {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  width: 28px; height: 28px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: none;
  transition: all var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.page-pill:hover { border-color: var(--neon3); color: var(--neon3); }
.page-pill.active {
  background: var(--neon3);
  border-color: var(--neon3);
  color: var(--bg);
}

/* Challenge number */
.challenge-num {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--neon2);
  letter-spacing: 1px;
  margin-bottom: 0.3rem;
}