/* ==========================================================================
   CHEMSAK — Education Blogger Template
   Design system + shared layout
   ========================================================================== */

:root{
  --ink:            #10241f;
  --ink-soft:       #3d5049;
  --muted:          #5f7570;
  --line:           #dfe8e4;
  --bg:             #f6faf8;
  --surface:        #ffffff;
  --primary:        #00ade7;
  --primary-dark:   #026690;
  --primary-light:  #e3f7fd;
  --accent:         #fc7c49;
  --accent-dark:    #e4602b;
  --grade-9:        #3fb588;
  --grade-10:       #2a62ba;
  --grade-11:       #7a5cd6;
  --grade-12:       #d63a57;
  --radius-sm:      8px;
  --radius:         14px;
  --radius-lg:      22px;
  --shadow-sm:      0 1px 3px rgba(16,36,31,.08);
  --shadow:         0 8px 24px rgba(16,36,31,.08);
  --shadow-lg:      0 20px 45px rgba(16,36,31,.14);
  --container:      1180px;
  --font: "Poppins", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;

  /* CHEMSAK nav + footer — dark design system (sitewide) */
  --cs-ink:          #0A1F2E;
  --cs-ink-2:        #0F2A3D;
  --cs-blue:         #0568AF;
  --cs-blue-light:   #5BA8DC;
  --cs-coral:        #D85A30;
  --cs-paper:        #F7F3EA;
  --cs-line:         rgba(247,243,234,0.10);
  --cs-line-strong:  rgba(247,243,234,0.20);
  --cs-text-hi:      #F7F3EA;
  --cs-text-mid:     rgba(247,243,234,0.72);
  --cs-text-low:     rgba(247,243,234,0.48);
  --cs-font-display: 'Source Serif 4', Georgia, serif;
  --cs-font-body:    'Inter', system-ui, sans-serif;
  --cs-font-mono:    'IBM Plex Mono', ui-monospace, monospace;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
ul{ margin: 0; padding: 0; list-style: none; }
h1,h2,h3,h4{ margin: 0 0 .5em; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
p{ margin: 0 0 1em; }
button{ font-family: inherit; cursor: pointer; }
.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.visually-hidden{
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- Section rhythm ---------- */
.section{ padding: 72px 0; }
.section--tight{ padding: 48px 0; }
.section--alt{ background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head{ max-width: 640px; margin: 0 0 40px; }
.section-head.center{ margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow{
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--primary); margin-bottom: 14px;
}
.eyebrow::before{
  content: ""; width: 22px; height: 2px; background: var(--accent); display: inline-block;
}
.section-head h2{ font-size: clamp(1.6rem, 2.6vw, 2.2rem); color: var(--ink); }
.section-head p{ color: var(--muted); font-size: 1.02rem; }

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: .95rem;
  border: 2px solid transparent; transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn:hover{ transform: translateY(-2px); }
.btn-primary{ background: var(--accent); color: #241705; box-shadow: 0 10px 24px rgba(240,166,61,.35); }
.btn-primary:hover{ background: var(--accent-dark); }
.btn-outline{ border-color: rgba(255,255,255,.6); color: inherit; }
.btn-outline:hover{ border-color: var(--accent); color: var(--accent); }
.btn-dark{ background: var(--primary); color: #fff; }
.btn-dark:hover{ background: var(--primary-dark); }
.btn-ghost{ background: var(--primary-light); color: var(--primary-dark); }
.btn-ghost:hover{ background: #d7ece4; }
.btn-sm{ padding: 9px 18px; font-size: .85rem; }
.btn-block{ width: 100%; }

/* ---------- Header / nav ---------- */
.site-nav{
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 6vw;
  background: rgba(10,31,46,0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--cs-line);
}
.nav-brand{ display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-brand img{ width: 28px; height: 28px; display: block; }
.nav-brand span{
  font-family: var(--cs-font-display); font-weight: 700; font-size: 1rem;
  color: var(--cs-text-hi); letter-spacing: .01em;
}
.nav-right{ display: flex; align-items: center; gap: 26px; }
.nav-links{ display: flex; align-items: center; gap: 30px; list-style: none; margin: 0; padding: 0; }
.nav-links a{
  font-family: var(--cs-font-body); font-size: .9rem; font-weight: 500;
  color: var(--cs-text-mid); text-decoration: none; transition: color .15s ease;
}
.nav-links a:hover{ color: var(--cs-text-hi); }
.nav-links a.nav-cta{
  font-family: var(--cs-font-body); font-weight: 600; font-size: .86rem;
  color: var(--cs-ink); background: var(--cs-text-hi);
  padding: 9px 18px; border-radius: 999px; text-decoration: none; white-space: nowrap;
  transition: transform .15s ease, background .15s ease;
}
.nav-links a.nav-cta:hover{ background: var(--cs-blue-light); transform: translateY(-1px); }

.nav-toggle{
  display: none; background: none; border: none; color: var(--cs-text-hi); cursor: pointer; padding: 4px;
}

/* ---------- Header search ---------- */
.nav-search-toggle{
  flex-shrink: 0;
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 999px;
  background: none; border: none; color: var(--cs-text-mid); cursor: pointer;
  transition: color .15s ease, background .15s ease;
}
.nav-search-toggle:hover, .nav-search-toggle.is-active{
  color: var(--cs-text-hi); background: rgba(247,243,234,0.08);
}
.nav-search-panel{
  position: sticky; top: 0; z-index: 99;
  max-height: 0; overflow: hidden;
  background: var(--cs-ink-2); border-bottom: 1px solid var(--cs-line-strong);
  transition: max-height .22s ease;
}
.nav-search-panel.open{ max-height: 90px; }
.nav-search-form{
  display: flex; align-items: center; gap: 12px;
  max-width: 520px; margin: 0 auto; padding: 18px 6vw;
}
.nav-search-form svg{ flex-shrink: 0; color: var(--cs-text-low); }
.nav-search-form input[type="search"]{
  flex: 1; border: none; background: transparent; outline: none;
  font-family: var(--cs-font-body); font-size: .95rem; color: var(--cs-text-hi);
  border-bottom: 1px solid var(--cs-line-strong); padding: 8px 2px;
}
.nav-search-form input[type="search"]::-webkit-search-cancel-button{ filter: invert(1); opacity: .6; }
.nav-search-form input[type="search"]::placeholder{ color: var(--cs-text-low); }
.nav-search-form input[type="search"]:focus{ border-color: var(--cs-blue-light); }

@media (max-width: 900px){
  .nav-links{
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 18px;
    background: var(--cs-ink-2); padding: 22px 6vw 26px;
    border-bottom: 1px solid var(--cs-line-strong);
    display: none;
  }
  .nav-links.open{ display: flex; }
  .nav-links .nav-cta{ margin-top: 4px; }
  .nav-toggle{ display: block; }
  .nav-right{ gap: 10px; }
}

/* ---------- Hero ---------- */
.hero{
  position: relative; overflow: hidden;
  background: radial-gradient(1200px 500px at 85% -10%, #123f34 0%, var(--primary-dark) 45%, #082921 100%);
  color: #fff;
  padding: 88px 0 100px;
}
.hero-grid{
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center;
}
.hero-badge{
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18);
  padding: 8px 16px; border-radius: 999px; font-size: .82rem; font-weight: 600; margin-bottom: 22px;
}
.hero-badge span.dot{ width: 8px; height: 8px; border-radius: 50%; background: var(--accent); display: inline-block; }
.hero h1{ font-size: clamp(2.1rem, 4vw, 3.1rem); color: #fff; }
.hero h1 em{ font-style: normal; color: var(--accent); }
.hero p.lead{ font-size: 1.12rem; color: rgba(255,255,255,.82); max-width: 500px; }
.hero-actions{ display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-stats{ display: flex; gap: 32px; margin-top: 48px; flex-wrap: wrap; }
.hero-stats div strong{ display: block; font-size: 1.6rem; color: var(--accent); }
.hero-stats div span{ font-size: .82rem; color: rgba(255,255,255,.7); }

.hero-art{ position: relative; display: flex; align-items: center; justify-content: center; }
.beaker-card{
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.16);
  border-radius: var(--radius-lg); padding: 28px; backdrop-filter: blur(6px);
  width: 100%; max-width: 420px;
}
.beaker-card svg{ width: 100%; height: auto; }
.beaker-caption{ text-align: center; margin-top: 14px; font-size: .85rem; color: rgba(255,255,255,.75); }

/* ---------- Page banner (inner pages) ---------- */
.page-banner{
  background: linear-gradient(120deg, var(--primary-dark), var(--primary));
  color: #fff; padding: 56px 0 60px;
}
.breadcrumb{ display: flex; gap: 8px; align-items: center; font-size: .85rem; color: rgba(255,255,255,.75); margin-bottom: 14px; flex-wrap: wrap; }
.breadcrumb a:hover{ color: var(--accent); }
.breadcrumb .sep{ opacity: .5; }
.page-banner h1{ color: #fff; font-size: clamp(1.7rem, 3vw, 2.4rem); margin-bottom: 10px; }
.page-banner p{ color: rgba(255,255,255,.82); max-width: 600px; margin-bottom: 0; }

/* ---------- Stat strip ---------- */
.stat-strip{ background: var(--surface); border-bottom: 1px solid var(--line); }
.stat-strip .container{ display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; padding-top: 32px; padding-bottom: 32px; }
.stat-item{ text-align: center; border-right: 1px solid var(--line); }
.stat-item:last-child{ border-right: none; }
.stat-item strong{ display: block; font-size: 1.7rem; color: var(--primary-dark); }
.stat-item span{ font-size: .82rem; color: var(--muted); }

/* ---------- Class cards ---------- */
.class-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.class-card{
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px; position: relative; overflow: hidden; transition: transform .18s ease, box-shadow .18s ease;
}
.class-card:hover{ transform: translateY(-4px); box-shadow: var(--shadow); }
.class-card::before{
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 5px; background: var(--grade-c, var(--primary));
}
.class-card[data-grade="9"]{ --grade-c: var(--grade-9); }
.class-card[data-grade="10"]{ --grade-c: var(--grade-10); }
.class-card[data-grade="11"]{ --grade-c: var(--grade-11); }
.class-card[data-grade="12"]{ --grade-c: var(--grade-12); }
.class-card .tag{
  display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .04em;
  padding: 4px 10px; border-radius: 999px; margin-bottom: 14px; text-transform: uppercase;
  background: color-mix(in srgb, var(--grade-c) 14%, white); color: var(--grade-c);
}
.class-card h3{ font-size: 1.25rem; margin-bottom: 6px; }
.class-card p{ color: var(--muted); font-size: .92rem; }
.class-card .topics{ display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 18px; }
.class-card .topics li{ font-size: .78rem; background: var(--bg); border: 1px solid var(--line); padding: 4px 10px; border-radius: 999px; color: var(--ink-soft); }
.class-card .meta-row{ display: flex; justify-content: space-between; align-items: center; font-size: .82rem; color: var(--muted); margin-bottom: 16px; }

/* ---------- Post cards ---------- */
.post-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.post-card{
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; transition: transform .18s ease, box-shadow .18s ease;
}
.post-card:hover{ transform: translateY(-4px); box-shadow: var(--shadow); }
.post-thumb{
  height: 150px; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--grade-c, var(--primary)), color-mix(in srgb, var(--grade-c, var(--primary)) 55%, black));
  position: relative; overflow: hidden;
}
.post-thumb svg{ width: 48px; height: 48px; color: rgba(255,255,255,.9); }
.post-thumb img{ width: 100%; height: 100%; object-fit: contain; object-position: center; background: rgba(255,255,255,.92); }
.post-thumb .badge{
  position: absolute; top: 12px; left: 12px; background: rgba(0,0,0,.28); color: #fff;
  font-size: .72rem; font-weight: 700; padding: 4px 10px; border-radius: 999px; backdrop-filter: blur(2px);
}
.post-card[data-grade="9"] .post-thumb{ --grade-c: var(--grade-9); }
.post-card[data-grade="10"] .post-thumb{ --grade-c: var(--grade-10); }
.post-card[data-grade="11"] .post-thumb{ --grade-c: var(--grade-11); }
.post-card[data-grade="12"] .post-thumb{ --grade-c: var(--grade-12); }
.post-body{ padding: 20px 22px 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.post-topic{ font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; color: var(--primary); }
.post-card h3{ font-size: 1.05rem; }
.post-card h3 a:hover{ color: var(--primary); }
.post-excerpt{ font-size: .88rem; color: var(--muted); flex: 1; }
.post-meta{ display: flex; justify-content: space-between; align-items: center; font-size: .78rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 12px; }
.post-meta .read-more{ font-weight: 700; color: var(--primary-dark); }
.post-meta .read-more:hover{ color: var(--accent-dark); }

/* ---------- Topics grid ---------- */
.topic-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.topic-pill{
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; display: flex; align-items: center; gap: 12px; transition: all .15s ease;
}
.topic-pill:hover{ border-color: var(--primary); background: var(--primary-light); }
.topic-pill .ico{
  width: 38px; height: 38px; border-radius: 10px; background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.topic-pill .ico svg{ width: 20px; height: 20px; }
.topic-pill strong{ font-size: .9rem; display: block; }
.topic-pill span{ font-size: .76rem; color: var(--muted); }

/* ---------- Mentor / About teaser ---------- */
.mentor-split{ display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: center; }
.mentor-photo{
  aspect-ratio: 4/5; border-radius: var(--radius-lg); background: linear-gradient(160deg, var(--primary-light), #fff);
  border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden;
}
.mentor-photo svg{ width: 55%; color: var(--primary); }
.mentor-photo .ring{ position: absolute; inset: 16px; border: 2px dashed color-mix(in srgb, var(--primary) 35%, transparent); border-radius: calc(var(--radius-lg) - 4px); }
.mentor-cred{ display: flex; gap: 10px; flex-wrap: wrap; margin: 18px 0 22px; }
.mentor-cred li{ background: var(--primary-light); color: var(--primary-dark); font-size: .8rem; font-weight: 600; padding: 6px 12px; border-radius: 999px; }

/* ---------- Value / feature cards ---------- */
.value-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card{ background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.value-card .ico{ width: 44px; height: 44px; border-radius: 12px; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.value-card .ico svg{ width: 22px; height: 22px; }
.value-card h3{ font-size: 1.02rem; }
.value-card p{ font-size: .88rem; color: var(--muted); margin: 0; }

/* ---------- Timeline (About) ---------- */
.timeline{ border-left: 2px solid var(--line); margin-left: 8px; }
.timeline-item{ position: relative; padding: 4px 0 30px 30px; }
.timeline-item::before{ content: ""; position: absolute; left: -7px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); border: 3px solid var(--surface); box-shadow: 0 0 0 2px var(--accent); }
.timeline-item h4{ margin-bottom: 4px; font-size: 1rem; }
.timeline-item p{ color: var(--muted); font-size: .9rem; margin: 0; }

/* ---------- CTA banner ---------- */
.cta-banner{
  background: linear-gradient(120deg, var(--primary-dark), var(--primary));
  color: #fff; border-radius: var(--radius-lg); padding: 48px; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.cta-banner h2{ color: #fff; font-size: 1.6rem; margin-bottom: 6px; }
.cta-banner p{ color: rgba(255,255,255,.8); margin: 0; }

/* ---------- Filters (List page) ---------- */
.list-layout{ display: grid; grid-template-columns: 280px 1fr; gap: 32px; align-items: start; }
.filter-panel{
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; position: sticky; top: 96px;
}
.filter-panel h3{ font-size: .95rem; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-soft); margin-bottom: 14px; }
.filter-search{
  display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 14px; margin-bottom: 22px; background: var(--bg);
}
.filter-search svg{ width: 16px; height: 16px; color: var(--muted); flex-shrink: 0; }
.filter-search input{ border: none; background: transparent; outline: none; font-size: .88rem; width: 100%; color: var(--ink); }
.filter-group{ margin-bottom: 22px; }
.filter-group:last-child{ margin-bottom: 0; }
.filter-group .group-label{ display: flex; justify-content: space-between; align-items: center; font-size: .82rem; font-weight: 700; color: var(--ink); margin-bottom: 10px; }
.chip-row{ display: flex; flex-wrap: wrap; gap: 8px; }
.chip{
  border: 1px solid var(--line); background: var(--bg); color: var(--ink-soft);
  font-size: .82rem; font-weight: 600; padding: 7px 14px; border-radius: 999px; transition: all .15s ease;
}
.chip:hover{ border-color: var(--primary); color: var(--primary-dark); }
.chip.is-active{ background: var(--primary); border-color: var(--primary); color: #fff; }
.check-list{ display: flex; flex-direction: column; gap: 10px; }
.check-list label{ display: flex; align-items: center; gap: 10px; font-size: .88rem; color: var(--ink-soft); cursor: pointer; }
.check-list input[type="checkbox"]{ accent-color: var(--primary); width: 16px; height: 16px; }
.check-list .count{ margin-left: auto; font-size: .76rem; color: var(--muted); background: var(--bg); padding: 1px 8px; border-radius: 999px; }
.filter-clear{ margin-top: 20px; width: 100%; text-align: center; padding: 10px; border-radius: 999px; border: 1px solid var(--line); background: transparent; font-weight: 600; font-size: .85rem; color: var(--ink-soft); }
.filter-clear:hover{ border-color: var(--primary); color: var(--primary-dark); }

.list-toolbar{ display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.result-count strong{ color: var(--primary-dark); }
.active-filters{ display: flex; flex-wrap: wrap; gap: 8px; }
.active-filters .chip.mini{ padding: 5px 12px; font-size: .76rem; background: var(--primary-light); border-color: var(--primary-light); color: var(--primary-dark); display: inline-flex; align-items: center; gap: 6px; }
.active-filters .chip.mini button{ background: none; border: none; color: var(--primary-dark); font-weight: 700; padding: 0; cursor: pointer; line-height: 1; }
.sort-select{ border: 1px solid var(--line); border-radius: 999px; padding: 9px 16px; font-size: .85rem; background: var(--surface); color: var(--ink-soft); }

.empty-state{ text-align: center; padding: 60px 20px; color: var(--muted); display: none; }
.empty-state.show{ display: block; }
.empty-state svg{ width: 56px; height: 56px; color: var(--line); margin: 0 auto 16px; }

.pagination{ display: flex; justify-content: center; gap: 8px; margin-top: 40px; }
.pagination a, .pagination span{
  width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
  border-radius: 10px; border: 1px solid var(--line); font-size: .88rem; font-weight: 600; color: var(--ink-soft);
}
.pagination a:hover{ border-color: var(--primary); color: var(--primary-dark); }
.pagination .active{ background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Detail page ---------- */
.detail-layout{ display: grid; grid-template-columns: 1fr 320px; gap: 44px; align-items: start; }
.article-head{ margin-bottom: 28px; }
.article-badges{ display: flex; gap: 8px; margin-bottom: 14px; }
.badge{ font-size: .74rem; font-weight: 700; padding: 5px 12px; border-radius: 999px; text-transform: uppercase; letter-spacing: .03em; }
.badge.grade{ background: var(--primary-light); color: var(--primary-dark); }
.badge.topic{ background: #fdecd2; color: var(--accent-dark); }
.article-meta{ display: flex; align-items: center; gap: 18px; flex-wrap: wrap; color: var(--muted); font-size: .86rem; margin-top: 16px; }
.article-meta .author{ display: flex; align-items: center; gap: 10px; color: var(--ink-soft); font-weight: 600; }
.avatar{ width: 34px; height: 34px; border-radius: 50%; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: .8rem; font-weight: 700; }

.toc-card{ background: var(--primary-light); border-radius: var(--radius); padding: 20px 22px; margin-bottom: 32px; }
.toc-card h4{ font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--primary-dark); margin-bottom: 10px; }
.toc-card ol{ margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 6px; }
.toc-card a{ font-size: .9rem; color: var(--ink-soft); }
.toc-card a:hover{ color: var(--primary-dark); }

.article-body{ overflow: hidden; } /* contain any stray floats from imported content */
.article-body h2{ font-size: 1.35rem; margin-top: 36px; }
.article-body h3{ font-size: 1.1rem; margin-top: 24px; }
.article-body p{ color: var(--ink-soft); }
.article-body ul, .article-body ol{ color: var(--ink-soft); margin: 0 0 1em; padding-left: 22px; }
.article-body li{ margin-bottom: 6px; }
.article-body table{ width: 100%; border-collapse: collapse; margin: 20px 0; font-size: .92rem; }
.article-body th, .article-body td{ border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.article-body th{ background: var(--primary-light); color: var(--primary-dark); }
/* Imported (Blogger-era) content: normalize stray inline styles and image galleries */
.article-body img{ max-width: 100%; height: auto; border-radius: 10px; }
.article-body .separator{
  display: inline-block; vertical-align: top; max-width: 320px; width: 100%;
  margin: 8px 12px 8px 0; text-align: center;
}
.article-body p, .article-body div{ text-align: left !important; }
.callout{ background: #fdf6ea; border-left: 4px solid var(--accent); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 16px 20px; margin: 22px 0; font-size: .92rem; color: var(--ink-soft); }

.accordion-item{ border: 1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 12px; overflow: hidden; }
.accordion-trigger{
  width: 100%; text-align: left; background: var(--surface); border: none; padding: 16px 18px;
  display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: .92rem; color: var(--ink);
}
.accordion-trigger svg{ width: 18px; height: 18px; flex-shrink: 0; transition: transform .2s ease; color: var(--primary); }
.accordion-item.is-open .accordion-trigger svg{ transform: rotate(180deg); }
.accordion-panel{ max-height: 0; overflow: hidden; transition: max-height .25s ease; background: var(--bg); }
.accordion-item.is-open .accordion-panel{ max-height: 400px; }
.accordion-panel-inner{ padding: 16px 18px; font-size: .9rem; color: var(--ink-soft); }

.tag-row{ display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.tag-row a{ background: var(--bg); border: 1px solid var(--line); padding: 6px 14px; border-radius: 999px; font-size: .82rem; color: var(--ink-soft); }
.tag-row a:hover{ border-color: var(--primary); color: var(--primary-dark); }

.share-row{ display: flex; align-items: center; gap: 10px; margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--line); }
.share-row span{ font-size: .82rem; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }

.author-box{ display: flex; gap: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin-top: 40px; }
.author-box .avatar{ width: 56px; height: 56px; font-size: 1.1rem; flex-shrink: 0; }
.author-box h4{ margin-bottom: 4px; }
.author-box p{ font-size: .88rem; color: var(--muted); margin: 0; }

.sidebar-card{ background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin-bottom: 22px; }
.sidebar-card h4{ font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-soft); margin-bottom: 16px; }
.mini-post{ display: flex; gap: 12px; margin-bottom: 16px; }
.mini-post:last-child{ margin-bottom: 0; }
.mini-thumb{ width: 52px; height: 52px; border-radius: 10px; flex-shrink: 0; background: linear-gradient(135deg, var(--grade-c, var(--primary)), color-mix(in srgb, var(--grade-c, var(--primary)) 55%, black)); display: flex; align-items: center; justify-content: center; }
.mini-thumb svg{ width: 22px; height: 22px; color: #fff; }
.mini-post h5{ font-size: .85rem; margin: 0 0 4px; font-weight: 600; }
.mini-post span{ font-size: .74rem; color: var(--muted); }
.sidebar-cta{ text-align: center; }
.sidebar-cta p{ font-size: .88rem; color: var(--muted); }

/* ---------- Newsletter / Contact form ---------- */
.form-card{ background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 40px; }
.form-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-grid .full{ grid-column: 1 / -1; }
.field label{ display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; color: var(--ink-soft); }
.field input, .field select, .field textarea{
  width: 100%; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px;
  font-family: inherit; font-size: .92rem; background: var(--bg); color: var(--ink); outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus{ border-color: var(--primary); background: var(--surface); }
.field textarea{ resize: vertical; min-height: 120px; }

/* ---------- Download PDF CTA + gate modal ---------- */
.download-card{
  background: linear-gradient(150deg, var(--primary-light), #fff);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; text-align: center;
}
.download-card .ico{
  width: 48px; height: 48px; border-radius: 12px; background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center; margin: 0 auto 14px;
}
.download-card .ico svg{ width: 24px; height: 24px; }
.download-card h4{ font-size: 1rem; margin-bottom: 6px; text-transform: none; letter-spacing: 0; color: var(--ink); }
.download-card p{ font-size: .85rem; color: var(--muted); margin-bottom: 16px; }

.modal-overlay{
  position: fixed; inset: 0; background: rgba(16,36,31,.55);
  display: flex; align-items: center; justify-content: center; padding: 20px;
  z-index: 300; opacity: 0; pointer-events: none; transition: opacity .2s ease;
}
.modal-overlay.is-open{ opacity: 1; pointer-events: auto; }
.modal-box{
  background: var(--surface); border-radius: var(--radius-lg); padding: 32px;
  width: 100%; max-width: 440px; box-shadow: var(--shadow-lg); position: relative;
  transform: translateY(14px); transition: transform .2s ease;
  max-height: 90vh; overflow-y: auto;
}
.modal-overlay.is-open .modal-box{ transform: translateY(0); }
.modal-close{
  position: absolute; top: 16px; right: 16px; width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--line); background: var(--bg); display: flex; align-items: center; justify-content: center;
  color: var(--ink-soft);
}
.modal-close:hover{ background: var(--primary-light); color: var(--primary-dark); }
.modal-close svg{ width: 16px; height: 16px; }
.modal-icon{
  width: 52px; height: 52px; border-radius: 14px; background: var(--primary-light); color: var(--primary);
  display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.modal-icon svg{ width: 26px; height: 26px; }
.modal-box h3{ font-size: 1.25rem; margin-bottom: 6px; }
.modal-box .modal-sub{ color: var(--muted); font-size: .9rem; margin-bottom: 22px; }
.modal-field{ margin-bottom: 16px; }
.modal-field label{ display: block; font-size: .85rem; font-weight: 600; margin-bottom: 6px; color: var(--ink-soft); }
.modal-field input{
  width: 100%; border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px;
  font-family: inherit; font-size: .92rem; background: var(--bg); color: var(--ink); outline: none;
}
.modal-field input:focus{ border-color: var(--primary); background: var(--surface); }
.modal-field .field-error{ display: none; color: #c0392b; font-size: .78rem; margin-top: 5px; }
.modal-field.has-error input{ border-color: #c0392b; }
.modal-field.has-error .field-error{ display: block; }
.modal-note{ font-size: .78rem; color: var(--muted); margin-top: 14px; text-align: center; }

.modal-success{ display: none; text-align: center; }
.modal-success.is-active{ display: block; }
.modal-success .modal-icon{ background: #e3f6ea; color: #1f9d55; margin: 0 auto 18px; }
.modal-form.is-hidden{ display: none; }

/* ---------- Footer ---------- */
.site-footer{ background: #0B5C82; padding: 64px 6vw 0; }
.footer-inner{
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 36px;
}
.footer-brand-row{ display: flex; align-items: center; gap: 12px; text-decoration: none; }
.footer-brand-row img{ width: 38px; height: 38px; border-radius: 50%; background: #fff; }
.footer-brand-name{
  font-family: var(--cs-font-display); font-weight: 700; font-size: 1.05rem; color: #fff; letter-spacing: .02em;
}
.footer-tagline{ font-family: var(--cs-font-body); font-size: .86rem; color: rgba(255,255,255,.72); margin-top: 10px; }
.footer-social{ display: flex; gap: 10px; margin-top: 20px; }
.footer-social a{
  width: 34px; height: 34px; border-radius: 50%; border: 1px solid rgba(255,255,255,.35);
  display: flex; align-items: center; justify-content: center; color: #fff; text-decoration: none;
  transition: background .15s ease, border-color .15s ease;
}
.footer-social a:hover{ background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.6); }
.footer-app-links{ margin-top: 22px; display: flex; flex-direction: column; gap: 10px; max-width: 220px; }
.footer-app-btn{
  display: flex; align-items: center; gap: 9px; padding: 9px 16px;
  border: 1px solid rgba(255,255,255,.35); border-radius: 8px; color: #fff; text-decoration: none;
  font-family: var(--cs-font-body); font-weight: 600; font-size: .86rem;
  transition: background .15s ease, border-color .15s ease;
}
.footer-app-btn:hover{ background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.6); }
.footer-col h4{
  font-family: var(--cs-font-mono); font-size: 12px; font-weight: 700; letter-spacing: .08em;
  color: #fff; text-transform: uppercase; margin-bottom: 0;
}
.footer-col ul{ list-style: none; margin: 18px 0 0; padding: 0; display: flex; flex-direction: column; gap: 13px; }
.footer-col a{
  font-family: var(--cs-font-body); font-size: .92rem; color: rgba(255,255,255,.78);
  text-decoration: none; transition: color .15s ease;
}
.footer-col a:hover{ color: #fff; }
.footer-bottom{
  max-width: 1280px; margin: 48px auto 0; border-top: 1px solid rgba(255,255,255,.18);
  padding: 22px 0; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.footer-bottom .fb-copy{ font-family: var(--cs-font-body); font-size: .84rem; color: rgba(255,255,255,.65); }
.footer-bottom .fb-links{ display: flex; gap: 22px; }
.footer-bottom .fb-links a{
  font-family: var(--cs-font-body); font-size: .84rem; color: rgba(255,255,255,.72); text-decoration: none;
}
.footer-bottom .fb-links a:hover{ color: #fff; }

@media (max-width: 900px){
  .footer-inner{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px){
  .footer-inner{ grid-template-columns: 1fr; }
  .site-footer{ padding: 56px 6vw 0; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .hero-grid{ grid-template-columns: 1fr; }
  .hero-art{ order: -1; max-width: 360px; margin: 0 auto; }
  .class-grid, .post-grid, .topic-grid, .value-grid{ grid-template-columns: repeat(2, 1fr); }
  .mentor-split{ grid-template-columns: 1fr; }
  .mentor-photo{ max-width: 280px; margin: 0 auto; }
  .list-layout, .detail-layout{ grid-template-columns: 1fr; }
  .filter-panel{ position: static; }
  .stat-strip .container{ grid-template-columns: repeat(2,1fr); row-gap: 20px; }
  .stat-item:nth-child(2){ border-right: none; }
}
@media (max-width: 720px){
  .class-grid, .post-grid, .topic-grid, .value-grid{ grid-template-columns: 1fr; }
  .form-grid{ grid-template-columns: 1fr; }
  .cta-banner{ flex-direction: column; text-align: center; }
  .section{ padding: 52px 0; }
}

/* ---------- Related Courses slider (single post) ---------- */
.course-slider-wrap{ position: relative; }
.course-slider{
  display: flex; gap: 20px; overflow-x: auto; scroll-behavior: smooth; scroll-snap-type: x proximity;
  padding: 4px 4px 14px; -webkit-overflow-scrolling: touch;
}
.course-slider::-webkit-scrollbar{ height: 6px; }
.course-slider::-webkit-scrollbar-thumb{ background: var(--line); border-radius: 999px; }
.course-card{
  flex: 0 0 260px; scroll-snap-align: start; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column;
  transition: transform .18s ease, box-shadow .18s ease;
}
.course-card:hover{ transform: translateY(-4px); box-shadow: var(--shadow); }
.course-card-thumb{ position: relative; height: 150px; background: var(--primary-light); overflow: hidden; }
.course-card-thumb img{ width: 100%; height: 100%; object-fit: cover; }
.course-card-discount{
  position: absolute; top: 10px; right: 10px; background: var(--accent); color: #241705;
  font-size: .72rem; font-weight: 700; padding: 4px 9px; border-radius: 999px;
}
.course-card-body{ padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.course-card-body h3{ font-size: .95rem; line-height: 1.4; min-height: 2.7em; }
.course-card-price{ display: flex; align-items: baseline; gap: 8px; }
.course-card-price-final{ font-size: 1.05rem; font-weight: 700; color: var(--ink); }
.course-card-price-mrp{ font-size: .85rem; color: var(--muted); text-decoration: line-through; }
.course-slider-arrow{
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
  width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line); background: var(--surface);
  display: flex; align-items: center; justify-content: center; color: var(--ink-soft); box-shadow: var(--shadow-sm);
}
.course-slider-arrow:hover{ color: var(--primary-dark); border-color: var(--primary); }
.course-slider-arrow svg{ width: 18px; height: 18px; }
.course-slider-arrow--prev{ left: -20px; }
.course-slider-arrow--next{ right: -20px; }
@media (max-width: 720px){
  .course-slider-arrow{ display: none; }
  .course-card{ flex-basis: 220px; }
}