/* ==========================================================================
   free-material.css
   Reading Practice / Material de Lectura — card-based redesign
   Inner English

   Palette is pulled directly from the Inner English app's own level bars
   (screenshot: A1 teal → A2 deep teal → B1 sky blue), so this section reads
   as part of the same product instead of a bolted-on blog.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

.blog-section {
  --rp-bg: #F6F8FC;
  --rp-surface: #FFFFFF;
  --rp-ink: #16202B;
  --rp-ink-soft: #5B6B7C;
  --rp-line: #E4E9F0;

  --rp-blog: #33415C;
  --rp-blog-soft: #EEF1F6;

  --rp-a1: #17BEBB;
  --rp-a1-dark: #0FA19E;
  --rp-a1-soft: #E1FAF8;

  --rp-a2: #0B8793;
  --rp-a2-dark: #096B75;
  --rp-a2-soft: #DEF3F4;

  --rp-b1: #2F9BE8;
  --rp-b1-dark: #227ABF;
  --rp-b1-soft: #E5F3FD;

  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--rp-bg);
  padding: 72px 0 88px;
}

.blog-section .container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --------------------------------------------------------------------
   Section heading
   -------------------------------------------------------------------- */

.blog-section .section-title {
  font-size: clamp(1.9rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--rp-ink);
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.rp-subtitle {
  color: var(--rp-ink-soft);
  font-size: 1.02rem;
  max-width: 560px;
  margin: 0 0 22px;
  line-height: 1.5;
}

/* the gradient rule mirrors the level progression A1 → A2 → B1 used
   throughout this section, so it's information, not decoration */
.rp-rule {
  height: 5px;
  width: 96px;
  border-radius: 999px;
  margin-bottom: 40px;
  background: linear-gradient(90deg, var(--rp-a1), var(--rp-a2) 55%, var(--rp-b1));
}

/* --------------------------------------------------------------------
   Language segmented control (replaces the old plain tab underline)
   -------------------------------------------------------------------- */

.blog-language-tabs {
  display: inline-flex;
  gap: 4px;
  background: var(--rp-surface);
  border: 1px solid var(--rp-line);
  border-radius: 999px;
  padding: 4px;
  margin-bottom: 36px;
  box-shadow: 0 1px 2px rgba(16, 32, 43, 0.04);
}

.blog-tab {
  appearance: none;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 11px 26px;
  border-radius: 999px;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--rp-ink-soft);
  transition: color .2s ease, background .2s ease;
}

.blog-tab.active {
  color: #fff;
  background: linear-gradient(120deg, var(--rp-a1), var(--rp-b1));
}

/* --------------------------------------------------------------------
   Panels
   -------------------------------------------------------------------- */

.blog-lang-panel { display: none; }
.blog-lang-panel.active { display: block; }

.rp-groups {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* --------------------------------------------------------------------
   Level group — colored bar + chevron, echoing the app's own
   "Grammar Exercises" list (teal → blue → purple by level)
   -------------------------------------------------------------------- */

.level-group {
  background: var(--rp-surface);
  border: 1px solid var(--rp-line);
  border-radius: 20px;
  overflow: hidden;
}

.level-group > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 22px;
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  user-select: none;
}

.level-group > summary::-webkit-details-marker { display: none; }

.level-group.lvl-blog > summary { background: linear-gradient(120deg, var(--rp-blog), #232E42); }
.level-group.lvl-a1   > summary { background: linear-gradient(120deg, var(--rp-a1), var(--rp-a1-dark)); }
.level-group.lvl-a2   > summary { background: linear-gradient(120deg, var(--rp-a2), var(--rp-a2-dark)); }
.level-group.lvl-b1   > summary { background: linear-gradient(120deg, var(--rp-b1), var(--rp-b1-dark)); }

.lg-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.lg-title { flex: 1; }

.lg-count {
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.2);
  padding: 4px 11px;
  border-radius: 999px;
}

.lg-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform .25s ease;
}

.level-group[open] > summary .lg-chevron { transform: rotate(180deg); }

/* nested sub-lessons (Spanish A1 has Lección 1/2/3 inside one level) */

.rp-sublessons {
  padding: 18px 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sub-lesson {
  border: 1px solid var(--rp-line);
  border-radius: 16px;
  overflow: hidden;
}

.sub-lesson > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--rp-ink);
  background: var(--rp-a1-soft);
  user-select: none;
}

.level-group.lvl-a2 .sub-lesson > summary { background: var(--rp-a2-soft); }
.level-group.lvl-b1 .sub-lesson > summary { background: var(--rp-b1-soft); }

.sub-lesson > summary::-webkit-details-marker { display: none; }

.sub-lesson .lg-chevron { width: 16px; height: 16px; margin-left: auto; color: var(--rp-ink-soft); }
.sub-lesson[open] > summary .lg-chevron { transform: rotate(180deg); }

/* --------------------------------------------------------------------
   Card grid
   -------------------------------------------------------------------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(216px, 1fr));
  gap: 16px;
  padding: 18px 20px 22px;
}

.sub-lesson .card-grid { padding: 14px 16px 18px; }

.rp-card {
  display: flex;
  flex-direction: column;
  background: var(--rp-surface);
  border: 1px solid var(--rp-line);
  border-radius: 16px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.rp-card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 14px 26px -10px var(--card-shadow, rgba(23, 32, 43, 0.22));
}

.lvl-blog .rp-card { --card-shadow: rgba(51, 65, 92, 0.28); }
.lvl-a1   .rp-card { --card-shadow: rgba(23, 190, 187, 0.32); }
.lvl-a2   .rp-card { --card-shadow: rgba(11, 135, 147, 0.32); }
.lvl-b1   .rp-card { --card-shadow: rgba(47, 155, 232, 0.32); }

.card-thumb {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--rp-a1-soft);
}

.lvl-blog .card-thumb { background: var(--rp-blog-soft); }
.lvl-a2   .card-thumb { background: var(--rp-a2-soft); }
.lvl-b1   .card-thumb { background: var(--rp-b1-soft); }

.card-thumb::before {
  content: attr(data-icon);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  opacity: 0.55;
}

.card-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}

.rp-card:hover .card-thumb img { transform: scale(1.045); }

.card-level-chip {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  background: var(--rp-blog);
  z-index: 2;
}

.lvl-a1 .card-level-chip { background: var(--rp-a1-dark); }
.lvl-a2 .card-level-chip { background: var(--rp-a2-dark); }
.lvl-b1 .card-level-chip { background: var(--rp-b1-dark); }

.card-body {
  padding: 13px 15px 16px;
}

.card-title {
  margin: 0;
  font-size: 0.94rem;
  font-weight: 650;
  line-height: 1.35;
  color: var(--rp-ink);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------- */

@media (max-width: 640px) {
  .blog-section { padding: 52px 0 64px; }
  .card-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; }
  .level-group > summary { padding: 15px 16px; font-size: 0.98rem; }
  .lg-count { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .rp-card, .card-thumb img, .lg-chevron { transition: none; }
}