/* ===== CHALLENGES PAGE ===== */

.chal-main {
  min-height: 100vh;
  padding: 7rem 0 4rem;
}

/* ---- Difficulty selector ---- */
.chal-difficulty {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.chal-difficulty-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.chal-diff-btns {
  display: flex;
  gap: 0.4rem;
}

.chal-diff-btn {
  padding: 0.35rem 1rem;
  border-radius: 100px;
  border: 1px solid rgba(139,124,248,0.2);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s;
}
.chal-diff-btn:hover { border-color: var(--accent); color: var(--text); }
.chal-diff-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ---- Time badge ---- */
.chal-time-badge {
  display: inline-block;
  background: rgba(139,124,248,0.12);
  border-radius: 100px;
  padding: 0.05rem 0.45rem;
  font-size: 0.65rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-left: 0.4rem;
  vertical-align: middle;
}

/* ---- Category filter buttons ---- */
.chal-cat-btn {
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  border: 1px solid rgba(139,124,248,0.2);
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s;
  text-transform: capitalize;
}
.chal-cat-btn:hover { border-color: var(--accent); color: var(--text); }
.chal-cat-btn.active {
  background: rgba(139,124,248,0.15);
  border-color: rgba(139,124,248,0.5);
  color: var(--accent);
}

/* ---- Category badge on card ---- */
.chal-cat-badge {
  display: inline-block;
  border-radius: 100px;
  padding: 0.05rem 0.45rem;
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  margin-left: 0.3rem;
  vertical-align: middle;
  text-transform: capitalize;
  background: rgba(92,232,212,0.12);
  color: var(--accent2);
}

/* ---- Progress strip ---- */
.chal-progress {
  margin: 0 auto 3rem;
  max-width: 560px;
  text-align: center;
}

.chal-progress-bar {
  height: 4px;
  background: rgba(139,124,248,0.15);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1rem;
  position: relative;
}

.chal-progress-bar::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
  transform-origin: left;
  transform: scaleX(var(--pct, 0));
  transition: transform 0.6s ease;
}

.chal-progress-dots {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.chal-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(139,124,248,0.3);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.chal-dot.done {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-color: transparent;
  color: #fff;
}

.chal-dot.today {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 0 3px rgba(139,124,248,0.18);
}

.chal-progress-label {
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---- Grid ---- */
.chal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

/* ---- Day Card ---- */
.chal-card {
  background: var(--surface);
  border: 1px solid rgba(139,124,248,0.12);
  border-radius: 16px;
  padding: 1.4rem 1.5rem 1.2rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.chal-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--chal-color, #8b7cf8) 0%, transparent 70%);
  opacity: 0.06;
  pointer-events: none;
}

.chal-card:hover:not(.locked) {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
  border-color: rgba(139,124,248,0.3);
}

.chal-card.done {
  border-color: rgba(92,232,212,0.3);
}

.chal-card.done::before {
  background: linear-gradient(135deg, var(--accent2) 0%, transparent 70%);
  opacity: 0.08;
}

.chal-card.locked {
  opacity: 0.45;
  cursor: default;
}

.chal-card-top {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  margin-bottom: 0.9rem;
}

.chal-day-num {
  font-size: 0.72rem;
  color: var(--muted);
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1;
  margin-bottom: 0.2rem;
}

.chal-card-icon {
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}

.chal-card-info { flex: 1; }

.chal-card-title {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 1.1rem;
  color: var(--text);
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.chal-card-desc {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

.chal-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(139,124,248,0.08);
}

.chal-start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #6c5ce7);
  border: none;
  color: #fff;
  font-size: 0.78rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
}

.chal-start-btn:hover { opacity: 0.88; transform: translateY(-1px); }

.chal-done-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  color: var(--accent2);
  font-family: 'Inter', sans-serif;
}

.chal-mark-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
  background: transparent;
  border: 1px solid rgba(139,124,248,0.3);
  color: var(--muted);
  font-size: 0.75rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.chal-mark-btn:hover:not(:disabled) {
  background: rgba(139,124,248,0.1);
  border-color: var(--accent);
  color: var(--text);
}

.chal-mark-btn:disabled { opacity: 0.35; cursor: default; }

.chal-lock-icon {
  font-size: 0.85rem;
  color: var(--muted);
  margin-left: auto;
}

/* ---- Certificate ---- */
.chal-cert-wrap {
  margin-bottom: 2rem;
  text-align: center;
}

.chal-cert-inner {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, rgba(139,124,248,0.1), rgba(92,232,212,0.06));
  border: 1px solid rgba(139,124,248,0.3);
  border-radius: 20px;
  padding: 2rem 3rem;
  box-shadow: 0 0 40px rgba(139,124,248,0.1);
}

.chal-cert-icon { font-size: 2.5rem; line-height: 1; }

.chal-cert-title {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 1.4rem;
  color: var(--text);
  margin: 0;
  font-weight: 600;
}

.chal-cert-sub {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0;
  max-width: 280px;
}

.chal-cert-btn {
  margin-top: 0.5rem;
  padding: 0.6rem 1.8rem;
  border-radius: 100px;
  background: linear-gradient(135deg, var(--accent), #6c5ce7);
  border: none;
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
  letter-spacing: 0.04em;
}
.chal-cert-btn:hover { opacity: 0.88; transform: translateY(-1px); }

/* ---- Reset ---- */
.chal-reset-wrap {
  text-align: center;
  margin-bottom: 2rem;
}

.chal-reset-btn {
  background: none;
  border: 1px solid rgba(139,124,248,0.2);
  color: var(--muted);
  font-size: 0.78rem;
  font-family: 'Inter', sans-serif;
  padding: 0.45rem 1.1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.chal-reset-btn:hover { color: var(--text); border-color: rgba(139,124,248,0.5); }

/* ---- Responsive ---- */
@media (max-width: 540px) {
  .chal-grid { grid-template-columns: 1fr; }
  .chal-card { padding: 1.1rem 1.1rem 1rem; }
}

/* ---- Personal best ---- */
.chal-pb-wrap {
  margin: 0 0 1.5rem;
}

.chal-pb-title {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
}

.chal-pb-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

@media (max-width: 480px) {
  .chal-pb-grid { grid-template-columns: repeat(2, 1fr); }
}

.chal-pb-stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.7rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.chal-pb-val {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
}

.chal-pb-lbl {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}