/* =========================================================================
   Excel 101 — green, Coursera-inspired theme
   ========================================================================= */

:root {
  --green-50:  #ecfdf5;
  --green-100: #d1fae5;
  --green-200: #a7f3d0;
  --green-300: #6ee7b7;
  --green-400: #34d399;
  --green-500: #10b981;
  --green-600: #059669;
  --green-700: #047857;
  --green-800: #065f46;
  --green-900: #064e3b;

  --gray-50:  #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  --primary: var(--green-600);
  --primary-hover: var(--green-700);
  --primary-dark: var(--green-900);
  --bg: #ffffff;
  --bg-alt: var(--gray-50);
  --bg-tint: var(--green-50);
  --text: var(--gray-900);
  --text-body: var(--gray-700);
  --text-muted: var(--gray-500);
  --border: var(--gray-200);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow:    0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px -5px rgba(6, 78, 59, 0.12), 0 4px 10px -3px rgba(6, 78, 59, 0.06);

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --container: 1180px;
  --header-h: 64px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--primary-hover); text-decoration: underline; }

img { max-width: 100%; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section-title {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 32px;
  max-width: 640px;
}

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none !important;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn--primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 1px 0 0 rgba(6, 95, 70, 0.4);
}
.btn--primary:hover {
  background: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px -2px rgba(5, 150, 105, 0.4);
}
.btn--ghost {
  background: transparent;
  color: var(--primary-dark);
  border-color: var(--gray-300);
}
.btn--ghost:hover {
  border-color: var(--primary);
  color: var(--primary-hover);
  background: var(--green-50);
}

/* =========================================================================
   Site header
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none !important;
}
.site-brand__mark {
  display: inline-flex;
  width: 28px;
  height: 28px;
  color: var(--primary);
}
.site-brand__mark svg { width: 100%; height: 100%; }
.site-brand:hover { color: var(--primary-hover); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}
.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.93rem;
  color: var(--gray-700);
  font-weight: 500;
  text-decoration: none !important;
}
.site-nav__link:hover {
  color: var(--primary-dark);
  background: var(--green-50);
}

/* Modules dropdown */
.nav-dd { position: relative; }
.nav-dd__btn { background: none; border: none; cursor: pointer; font: inherit; }
.nav-dd__btn svg { transition: transform 0.15s; }
.nav-dd.is-open > .nav-dd__btn svg { transform: rotate(180deg); }
.nav-dd__menu {
  list-style: none; margin: 0; padding: 6px;
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 270px;
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  box-shadow: 0 16px 40px rgba(2, 44, 34, 0.16);
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity 0.15s, transform 0.15s, visibility 0.15s; z-index: 60;
}
.nav-dd:hover .nav-dd__menu,
.nav-dd.is-open .nav-dd__menu { opacity: 1; visibility: visible; transform: none; }
.nav-dd__menu a {
  display: flex; align-items: center; gap: 11px; padding: 9px 11px;
  border-radius: 9px; text-decoration: none !important; color: var(--text-body);
  font-size: 0.92rem;
}
.nav-dd__menu a:hover { background: var(--green-50); color: var(--primary-dark); }
.nav-dd__num {
  flex: 0 0 auto; width: 27px; height: 27px; border-radius: 8px;
  background: var(--gray-100); color: var(--gray-700);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 700;
}
.nav-dd__label { display: flex; flex-direction: column; line-height: 1.25; }
.nav-dd__dur { font-size: 0.74rem; color: var(--text-muted); }

/* Hamburger (mobile only) */
.nav-toggle {
  display: none; width: 42px; height: 42px; padding: 0;
  border: 1px solid var(--border); border-radius: 10px; background: #fff;
  cursor: pointer; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.nav-toggle__bar { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.2s; }
.site-header.nav-open .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header.nav-open .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-header.nav-open .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--border);
    padding: 10px 16px 18px; box-shadow: 0 16px 28px rgba(2, 44, 34, 0.1);
    display: none;
  }
  .site-header.nav-open .site-nav { display: flex; }
  .site-nav__link, .nav-dd__btn { width: 100%; justify-content: space-between; padding: 11px 12px; }
  .nav-dd { width: 100%; }
  .nav-dd__menu {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: none; border-radius: 0; min-width: 0;
    padding: 2px 0 4px 12px; display: none;
  }
  .nav-dd.is-open .nav-dd__menu { display: block; }
}

/* =========================================================================
   Hero
   ========================================================================= */
.hero {
  position: relative;
  background:
    radial-gradient(circle at 90% 0%, var(--green-100) 0%, transparent 40%),
    radial-gradient(circle at 0% 100%, var(--green-50) 0%, transparent 50%),
    #ffffff;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.hero__inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 64px 24px 80px;
}
.hero__eyebrow {
  display: inline-block;
  padding: 4px 12px;
  background: var(--green-100);
  color: var(--green-800);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero__title {
  font-size: clamp(2rem, 4.8vw, 3.5rem);
  line-height: 1.05;
  font-weight: 800;
  margin: 0 0 16px;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}
.hero__subtitle {
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  color: var(--gray-700);
  margin: 0 0 12px;
  font-weight: 500;
}
.hero__lede {
  color: var(--text-muted);
  margin: 0 0 32px;
  font-size: 1rem;
  max-width: 560px;
}
.hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  margin: 0;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.hero__stats > div { margin: 0; }
.hero__stats dt {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.hero__stats dd {
  margin: 4px 0 0;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
}
.hero__visual {
  position: relative;
  height: 420px;
}
.hero__card {
  position: absolute;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 18px;
}
.hero__card--1 {
  top: 30px;
  right: 0;
  width: 100%;
  max-width: 420px;
  display: grid;
  gap: 6px;
  transform: rotate(-1deg);
}
.hero__card-row {
  display: grid;
  grid-template-columns: 80px 90px 60px 1fr;
  align-items: center;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--gray-700);
  padding: 6px 4px;
}
.hero__card-row--header {
  background: var(--green-50);
  border-radius: 6px;
  height: 28px;
  padding: 0;
}
.hero__card-row--header span {
  height: 8px;
  background: var(--green-200);
  border-radius: 4px;
  margin: 0 8px;
}
.hero__card-row .bar {
  height: 8px;
  background: var(--green-500);
  border-radius: 4px;
  display: block;
  width: 100%;
}
.hero__card-row .bar--80 { width: 80%; }
.hero__card-row .bar--65 { width: 65%; }
.hero__card-row .bar--55 { width: 55%; background: var(--green-400); }
.hero__card-row .bar--45 { width: 45%; background: var(--green-400); }
.hero__card-row .bar--35 { width: 35%; background: var(--green-300); }

.hero__card--2 {
  bottom: 0;
  left: 0;
  max-width: 380px;
  display: grid;
  gap: 8px;
  transform: rotate(2deg);
  background: var(--gray-900);
  color: #fff;
  border-color: var(--gray-900);
}
.hero__card--2 .hero__card-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--green-300);
  text-transform: uppercase;
  font-weight: 700;
}
.hero__card--2 code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #f3f4f6;
  background: transparent;
  padding: 0;
  white-space: pre-wrap;
}

@media (max-width: 880px) {
  .hero__inner {
    grid-template-columns: 1fr;
    padding: 48px 24px 56px;
  }
  .hero__visual { display: none; }
}
@media (max-width: 520px) {
  .hero__stats { grid-template-columns: repeat(2, 1fr); }
}

/* =========================================================================
   Outcomes
   ========================================================================= */
.outcomes {
  padding: 64px 0;
  background: var(--bg);
}
.outcomes__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.outcomes__list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 18px 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.97rem;
  color: var(--text-body);
  line-height: 1.5;
}
.outcomes__check {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--green-100);
  color: var(--green-700);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* =========================================================================
   Modules grid
   ========================================================================= */
.modules {
  padding: 64px 0 80px;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}
.module-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
  position: relative;
  overflow: hidden;
}
.module-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green-400), var(--green-600));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s;
}
.module-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--green-300);
}
.module-card:hover::before { transform: scaleX(1); }

.module-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}
.module-card__num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-700);
  background: var(--green-50);
  padding: 4px 10px;
  border-radius: 999px;
}
.module-card__duration {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}
.module-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.module-card__summary {
  color: var(--text-body);
  font-size: 0.95rem;
  margin: 0 0 16px;
  flex-grow: 1;
}
.module-card__topics {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.module-card__topics li {
  font-size: 0.78rem;
  background: var(--gray-100);
  color: var(--gray-700);
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 500;
}
.module-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--primary);
  text-decoration: none !important;
}
.module-card__link svg { transition: transform 0.15s; }
.module-card:hover .module-card__link svg { transform: translateX(3px); }

/* =========================================================================
   How-to
   ========================================================================= */
.howto {
  padding: 72px 0;
  background: linear-gradient(180deg, var(--bg) 0%, var(--green-50) 100%);
  border-top: 1px solid var(--border);
}
.howto__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.howto__steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
}
.howto__steps li {
  counter-increment: step;
  position: relative;
  padding: 16px 0 16px 56px;
  border-bottom: 1px solid var(--border);
  color: var(--text-body);
  font-size: 1rem;
}
.howto__steps li:last-child { border-bottom: none; }
.howto__steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 14px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--green-600);
  color: white;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.howto__cta {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow);
}
.howto__cta p {
  margin: 0 0 20px;
  color: var(--text-body);
  font-size: 0.97rem;
}
@media (max-width: 760px) {
  .howto__inner { grid-template-columns: 1fr; }
}

/* =========================================================================
   Footer
   ========================================================================= */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 32px 0;
  margin-top: 0;
}
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.site-footer__brand strong {
  color: white;
  display: block;
  margin-bottom: 4px;
}
.site-footer__brand span { font-size: 0.88rem; color: var(--gray-400); }
.site-footer__links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.site-footer__links a {
  color: var(--gray-300);
  font-size: 0.92rem;
  text-decoration: none;
}
.site-footer__links a:hover {
  color: var(--green-400);
}

/* =========================================================================
   Lesson shell + sidebar
   ========================================================================= */
.lesson-shell {
  background: var(--bg);
  min-height: calc(100vh - var(--header-h));
}
.lesson-shell__inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 40px;
  padding: 32px 24px 64px;
  align-items: start;
}

.course-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  max-height: calc(100vh - var(--header-h) - 48px);
  overflow-y: auto;
}
.course-sidebar__eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-700);
}
.course-sidebar__title {
  font-size: 1.05rem;
  margin: 4px 0 4px;
  color: var(--text);
}
.course-sidebar__meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0 0 18px;
}
.course-sidebar__list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--border);
}
.course-sidebar__item {
  border-bottom: 1px solid var(--border);
}
.course-sidebar__link {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 8px;
  border-radius: var(--radius-sm);
  text-decoration: none !important;
  color: var(--text-body);
  transition: background 0.12s;
}
.course-sidebar__link:hover {
  background: var(--green-50);
  color: var(--primary-dark);
}
.course-sidebar__num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.course-sidebar__module-title {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
}
.course-sidebar__duration {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.course-sidebar__item.is-current .course-sidebar__num {
  background: var(--green-600);
  color: white;
}
.course-sidebar__item.is-current .course-sidebar__link {
  background: var(--green-50);
}
.course-sidebar__item.is-current .course-sidebar__module-title {
  color: var(--primary-dark);
}
.course-sidebar__sub {
  list-style: none;
  margin: 0 0 12px 44px;
  padding: 0;
}
.course-sidebar__sub li a {
  display: block;
  padding: 6px 12px;
  font-size: 0.85rem;
  color: var(--text-body);
  border-radius: var(--radius-sm);
  text-decoration: none !important;
}
.course-sidebar__sub li a:hover { background: var(--green-50); color: var(--primary-dark); }
.course-sidebar__sub li.is-current a {
  background: var(--green-100);
  color: var(--primary-dark);
  font-weight: 600;
}

@media (max-width: 880px) {
  .lesson-shell__inner { grid-template-columns: 1fr; }
  .course-sidebar { position: static; max-height: none; }
}

/* =========================================================================
   Lesson content
   ========================================================================= */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span:not([aria-hidden]) { color: var(--text); font-weight: 500; }

.lesson__header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.lesson__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--green-700);
  background: var(--green-50);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}
.lesson__title {
  font-size: clamp(1.75rem, 3.4vw, 2.4rem);
  font-weight: 800;
  margin: 0 0 8px;
  color: var(--gray-900);
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.lesson__subtitle {
  color: var(--text-muted);
  margin: 0 0 20px;
  font-size: 1.05rem;
}
.lesson__resources {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 20px;
}
.resource-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-body);
  text-decoration: none !important;
  transition: all 0.15s;
}
.resource-pill:hover {
  border-color: var(--green-400);
  color: var(--primary-dark);
  background: var(--green-50);
}
.resource-pill--accent {
  background: var(--green-600);
  color: white;
  border-color: var(--green-600);
}
.resource-pill--accent:hover {
  background: var(--green-700);
  color: white;
  border-color: var(--green-700);
}

.lesson__pager {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.lesson__pager-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none !important;
  color: var(--text);
  background: white;
  transition: all 0.15s;
}
.lesson__pager-link:hover {
  border-color: var(--green-400);
  background: var(--green-50);
  color: var(--primary-dark);
  transform: translateY(-1px);
}
.lesson__pager-link--next { text-align: right; }
.lesson__pager-direction {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.lesson__pager-title {
  font-weight: 600;
  font-size: 0.95rem;
}

/* =========================================================================
   Markdown body styles
   ========================================================================= */
.markdown {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.7;
}
.markdown h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-top: 40px;
  margin-bottom: 16px;
  color: var(--gray-900);
  letter-spacing: -0.01em;
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.markdown h3 {
  font-size: 1.18rem;
  font-weight: 700;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--gray-900);
  scroll-margin-top: calc(var(--header-h) + 16px);
}
.markdown h4 {
  font-size: 1.02rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--gray-800);
}
.markdown p { margin: 0 0 16px; }
.markdown ul, .markdown ol { margin: 0 0 18px; padding-left: 24px; }
.markdown li { margin-bottom: 6px; }
.markdown li > p { margin-bottom: 8px; }
.markdown a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.markdown a:hover { color: var(--primary-hover); }

.markdown strong { color: var(--gray-900); font-weight: 600; }

.markdown code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--green-50);
  color: var(--green-900);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--green-100);
}

.markdown pre {
  background: var(--gray-900);
  color: #e5e7eb;
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 20px;
  font-size: 0.88rem;
  line-height: 1.55;
}
.markdown pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.markdown blockquote {
  margin: 20px 0;
  padding: 14px 18px;
  background: var(--green-50);
  border-left: 3px solid var(--green-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--green-900);
  font-size: 0.95rem;
}
.markdown blockquote p { margin: 0; }
.markdown blockquote p + p { margin-top: 8px; }

.markdown table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 24px;
  font-size: 0.93rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.markdown thead {
  background: var(--green-50);
}
.markdown th {
  text-align: left;
  font-weight: 600;
  color: var(--green-900);
  padding: 10px 14px;
  border-bottom: 1px solid var(--green-200);
  font-size: 0.88rem;
  letter-spacing: 0.01em;
}
.markdown td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-body);
}
.markdown tr:last-child td { border-bottom: none; }
.markdown tr:hover td { background: var(--gray-50); }

.markdown details {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  margin-bottom: 24px;
}
.markdown details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--gray-900);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.markdown details summary::-webkit-details-marker { display: none; }
.markdown details summary::before {
  content: '▸';
  display: inline-block;
  color: var(--primary);
  transition: transform 0.15s;
}
.markdown details[open] summary::before { transform: rotate(90deg); }
.markdown details > ul {
  margin: 12px 0 4px;
  padding-left: 24px;
}

.markdown hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

/* Recap / final paragraphs sit naturally without extra rules */

/* ---------------------------------------------------------------- Downloads */
.downloads { padding: 56px 0 80px; }
.downloads__notice {
  background: var(--surface, #f6faf6);
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand, #2e7d32);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 20px 0 28px;
  font-size: 0.95rem;
}
.downloads__table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 32px;
}
.downloads__table th,
.downloads__table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.downloads__table thead th {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted, #5a6b5a);
}
.downloads__table a,
.downloads__list a {
  font-weight: 600;
  text-decoration: none;
}
.downloads__table a:hover,
.downloads__list a:hover { text-decoration: underline; }
.downloads__list { line-height: 1.9; margin: 8px 0 28px; padding-left: 20px; }
.downloads__back { margin-top: 24px; }

/* ------------------------------------------------- Mobile hardening */
/* The lesson article is a grid item; grid items default to min-width:auto,
   so a long code line or wide table stretches the column past the screen.
   min-width:0 lets it shrink and the inner overflow-x:auto take over. */
.lesson,
.lesson__body { min-width: 0; }
.lesson__body img { max-width: 100%; height: auto; }
.markdown pre { max-width: 100%; }           /* scrolls via its own overflow-x */
.breadcrumb { flex-wrap: wrap; }
html { scroll-padding-top: 80px; }   /* so anchor jumps clear the sticky header */

/* Inline code wraps instead of overflowing; fenced code blocks still scroll. */
.markdown :not(pre) > code {
  overflow-wrap: anywhere;
  word-break: break-word;
}

@media (max-width: 700px) {
  .lesson-shell__inner { padding: 20px 16px 48px; gap: 24px; }

  /* Wide tables scroll horizontally instead of running off the screen. */
  .markdown table,
  .downloads__table {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .markdown table thead th,
  .downloads__table thead th { white-space: nowrap; }

  /* Stack the prev/next pager. */
  .lesson__pager { grid-template-columns: 1fr; }
}