/* ═══════════════════════════════════════════════════════
   Subject Page – Sleek Button Cards
   Overrides per-page .btn, .studymaterial-grid, .mocktest-grid
   ═══════════════════════════════════════════════════════ */

.studymaterial-grid,
.mocktest-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);   /* 2 columns */
  gap: var(--sp-2, 10px);
  margin-top: var(--sp-4, 14px);
}

/* Single column on small phones */
@media (max-width: 480px) {
  .studymaterial-grid,
  .mocktest-grid {
    grid-template-columns: 1fr;
  }
}

.btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-3, 12px);
  padding: 11px 14px;
  border-radius: var(--radius-md, 12px);
  text-decoration: none;
  color: #fff;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  background: linear-gradient(135deg, var(--accent1) 0%, var(--accent2) 100%);
  box-shadow: 0 3px 12px rgba(0,0,0,0.18);
  border-top: 1px solid rgba(255,255,255,0.22);
  margin: 0;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* Shimmer sweep on hover */
.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -80%;
  width: 55%;
  height: 100%;
  background: linear-gradient(
    105deg,
    transparent,
    rgba(255,255,255,0.22),
    transparent
  );
  transform: skewX(-15deg);
  transition: left 0.5s ease;
  pointer-events: none;
}
.btn:hover::before {
  left: 135%;
}

.btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 22px rgba(0,0,0,0.28);
}

/* ── Icon box ── */
.btn-icon {
  width: 36px;
  height: 36px;
  min-width: 36px;
  background: rgba(255,255,255,0.18);
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

/* ── Label ── */
.btn-label {
  flex: 1;
  text-align: left;
  line-height: 1.35;
}

/* ── Chevron arrow ── */
.btn-arrow {
  width: 15px;
  height: 15px;
  min-width: 15px;
  opacity: 0.6;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.btn:hover .btn-arrow {
  transform: translateX(3px);
  opacity: 1;
}

/* ── Dark mode ── */
[data-theme="dark"] .btn {
  box-shadow: 0 3px 14px rgba(0,0,0,0.38);
  border-top-color: rgba(255,255,255,0.12);
}
[data-theme="dark"] .btn:hover {
  box-shadow: 0 6px 22px rgba(0,0,0,0.48);
}

/* ═══════════════════════════════════════════════════════
   Subject Q&A Section — structured content for SEO
   ═══════════════════════════════════════════════════════ */
.subject-qa {
  max-width: 900px;
  margin: var(--sp-8, 32px) auto 0;
  padding: 0 var(--sp-5, 20px) var(--sp-7, 28px);
  font-family: 'Poppins', sans-serif;
}

.subject-qa > h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--content-primary, #1a3c6e);
  margin: 0 0 var(--sp-2, 8px);
}

.qa-intro {
  font-size: 0.92rem;
  color: var(--text-secondary, #555);
  line-height: 1.65;
  margin: 0 0 var(--sp-5, 20px);
}

.qa-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3, 12px);
}

.qa-item {
  background: var(--surface-alt, #f5f8ff);
  border: 1px solid var(--divider-light, #dde4f0);
  border-left: 4px solid var(--accent1, #0d47a1);
  border-radius: var(--radius-md, 10px);
  overflow: hidden;
}

.qa-item summary.qa-q {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-3, 12px);
  padding: 14px 18px;
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--content-primary, #1a3c6e);
  cursor: pointer;
  line-height: 1.45;
  user-select: none;
}

.qa-item summary.qa-q::-webkit-details-marker { display: none; }

.qa-item summary.qa-q::after {
  content: '';
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231a3c6e' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: contain;
  transition: transform 0.25s ease;
}

.qa-item[open] summary.qa-q::after {
  transform: rotate(180deg);
}

.qa-item[open] summary.qa-q {
  border-bottom: 1px solid var(--divider-light, #dde4f0);
}

.qa-a {
  font-size: 0.875rem;
  color: var(--text-secondary, #4a5568);
  line-height: 1.7;
  margin: 0;
  padding: 13px 18px 15px;
}

/* Dark mode */
[data-theme="dark"] .subject-qa > h2,
[data-theme="dark"] .qa-item summary.qa-q {
  color: var(--primary, #c8d8f8);
}

[data-theme="dark"] .qa-item summary.qa-q::after {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23c8d8f8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
}

[data-theme="dark"] .qa-intro,
[data-theme="dark"] .qa-a {
  color: var(--text-secondary, #8fa8cc);
}

[data-theme="dark"] .qa-item {
  background: var(--surface-alt, rgba(30,40,65,0.7));
  border-color: var(--divider-light, #2d3a52);
  border-left-color: var(--accent1, #4a90e2);
}

[data-theme="dark"] .qa-item[open] summary.qa-q {
  border-bottom-color: var(--divider-light, #2d3a52);
}

/* ── Chapter group headings (JEE subject pages) ───────────── */
.chapter-group-heading {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent1);
  margin: 1.25rem 0 0.5rem;
  padding-bottom: 0.3rem;
  border-bottom: 2px solid var(--accent1);
  opacity: 0.85;
}

/* ── Coming-soon button variant ───────────────────────────── */
.btn.btn-soon {
  opacity: 0.62;
  pointer-events: none;
  cursor: default;
  position: relative;
}

.btn-soon-tag {
  margin-left: auto;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.22);
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
  flex-shrink: 0;
}