/* =============================================================================
   Modules Home — module directory page
   -----------------------------------------------------------------------------
   .modules-section          — main content area (px: 180px, pb: 120px)
     .modules-intro          — heading + description block
       .modules-intro__title — 48px display
       .modules-intro__desc  — 16px body
     .modules-subtitle       — "Where do you want to start?" (24px H3, blue)
     .modules-cards-list     — vertical stack of module cards (48px gap)

   .module-card              — horizontal card (left: info+image, right: toc+btn)
     .module-card__info      — left column (flex: 1, flex-col, 32px gap)
       .module-card__text    — title + desc (8px padding, 24px inner gap)
       .module-card__title   — 32px semi-bold H1
       .module-card__desc    — 16px regular body
       .module-card__image   — image placeholder (fills remaining height)
     .module-card__sidebar-col — right column (310px, flex-col, 16px gap)

   .module-toc               — mini sidebar panel inside card
     .module-toc__header     — "TABLE OF CONTENTS" row
     .module-toc__label      — label text (14px, primary blue)
     .module-toc__btn        — icon button (hamburger)
     .module-toc__section    — single module section group
       .module-toc__section-header
       .module-toc__section-label
       .module-toc__items
       .module-toc__item          — nav item pill (14px medium)
       .module-toc__item--obj     — learning-objectives variant (blue-10)

   .module-start-btn         — "Start module" primary button with arrow
   ============================================================================= */

/* --- Fade-in on load ---------------------------------------------------------
   Same subtle fade + slight rise used on the homepage, staggered across the
   intro block, subtitle, and each module card. Respects prefers-reduced-motion.
   ----------------------------------------------------------------------------- */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modules-intro,
.modules-subtitle,
.module-card {
  opacity: 0;
  animation: fade-in-up 0.6s ease-out forwards;
}

.modules-intro {
  animation-delay: 0.1s;
}

.modules-subtitle {
  animation-delay: 0.25s;
}

.modules-cards-list .module-card:nth-child(1) {
  animation-delay: 0.35s;
}

.modules-cards-list .module-card:nth-child(2) {
  animation-delay: 0.45s;
}

.modules-cards-list .module-card:nth-child(3) {
  animation-delay: 0.55s;
}

.modules-cards-list .module-card:nth-child(n+4) {
  animation-delay: 0.65s;
}

@media (prefers-reduced-motion: reduce) {
  .modules-intro,
  .modules-subtitle,
  .module-card {
    animation: none;
    opacity: 1;
  }
}

/* --- Page layout ------------------------------------------------------------ */
.modules-section {
  padding: var(--spacing-xxxl) 180px var(--spacing-page-margins);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xxxl);    /* 48px between intro, subtitle, and cards */
}

/* --- Intro block (full-bleed band, same colour as footer) ------------------- */
.modules-intro {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);      /* 32px between title and description */
  background-color: var(--background-primary);
  /* Bleed past the section's top + side padding to fill full width */
  margin: calc(-1 * var(--spacing-xxxl)) -180px 0;
  padding: var(--spacing-xxxl) 180px var(--spacing-xxxl);
}

.modules-intro__title {
  font-family: var(--font-family);
  font-size: 48px;
  font-weight: 600;
  line-height: 68px;
  letter-spacing: 0;
  color: var(--text-default);
  margin: 0;
  text-box-trim: trim-both;
  text-box-edge: cap alphabetic;
  text-box: trim-both cap alphabetic;
}

.modules-intro__desc {
  font-family: var(--font-family);
  font-size: var(--type-body-size);
  font-weight: var(--type-body-weight);
  line-height: var(--type-body-line-height);
  letter-spacing: var(--type-body-tracking);
  color: var(--text-default);
  margin: 0;
  max-width: 491px;
  text-box-trim: trim-both;
  text-box-edge: cap alphabetic;
  text-box: trim-both cap alphabetic;
}

/* --- Subtitle --------------------------------------------------------------- */
.modules-subtitle {
  font-family: var(--font-family);
  font-size: var(--type-h3-size);
  font-weight: var(--type-h3-weight);
  line-height: var(--type-h3-line-height);
  letter-spacing: var(--type-h3-tracking);
  color: var(--colour-primary-70);
  margin: 0;
}

/* --- Cards list ------------------------------------------------------------- */
.modules-cards-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xxxl);    /* 48px between cards */
  margin: 0 auto;
}

/* --- Module card ------------------------------------------------------------ */
.module-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);      /* 32px between left and right columns */
  padding-top: var(--spacing-xl);  /* 32px */
  padding-bottom: var(--spacing-xl);
  overflow: hidden;
  width: 100%;
  max-width: 900px;
  transition: filter 0.15s ease;
}

/* Slight brightening on hover, matching .module-start-btn:hover */
.module-card:hover {
  filter: brightness(1.04);
}

.module-card-content {
  display: flex;
  gap: var(--spacing-xl);      /* 32px between left and right columns */
  align-items: stretch;
}

/* --- Left column ----------------------------------------------------------- */
.module-card__info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-l);      /* 32px between text and image */
  flex: 1;
  min-width: 0;
  align-self: stretch;
}

.module-card__title {
  font-family: var(--font-family);
  font-size: 32px;
  font-weight: 600;
  line-height: 48px;
  letter-spacing: 0;
  color: var(--text-default);
  margin: 0;
  text-box-trim: trim-both;
  text-box-edge: cap alphabetic;
  text-box: trim-both cap alphabetic;
}

.module-card__desc {
  font-family: var(--font-family);
  font-size: var(--type-card-body-size);
  font-weight: var(--type-card-body-weight);
  line-height: var(--type-card-body-line-height);
  letter-spacing: var(--type-card-body-tracking);
  color: var(--text-default);
  margin: 0;
  text-box-trim: trim-both;
  text-box-edge: cap alphabetic;
  text-box: trim-both cap alphabetic;
}

/* Image placeholder fills remaining vertical space */
.module-card__image {
  height: auto;
  border-radius: var(--corner-m-radius);
}

.module-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--corner-m-radius);
}

/* --- Right column ---------------------------------------------------------- */
.module-card__sidebar-col {
  width: 310px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-m);       /* 16px between TOC panel and button */
  align-items: flex-end;
  justify-content: space-between;
}

/* --- Mini TOC panel -------------------------------------------------------- */
.module-toc {
  width: 100%;
  background-color: var(--panel-main-default);
  border: var(--weight-xxs) solid var(--surface-neutral-border);
  border-radius: var(--corner-m-radius);
  overflow: hidden;
}

/* TOC header row */
.module-toc__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  padding: var(--spacing-xs);  /* 8px */
}

.module-toc__header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0 var(--spacing-xs);
}

.module-toc__label {
  font-family: var(--font-family);
  font-size: var(--type-sidebar-module-size);
  font-weight: var(--type-sidebar-module-weight);
  line-height: var(--type-sidebar-item-line-height);
  letter-spacing: var(--type-sidebar-module-tracking);
  color: var(--colour-primary-70);
}


/* TOC section — reuses .sidebar-section + .sidebar-item from sidebar.css */

/* --- Start module button --------------------------------------------------- */
.module-start-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 40px;
  padding: var(--spacing-xs) var(--spacing-s);
  background-color: var(--button-primary-enabled);
  color: var(--button-primary-on-primary);
  border: none;
  border-radius: var(--corner-round);
  font-family: var(--font-family);
  font-size: var(--type-button-s-size);
  font-weight: 600;
  line-height: var(--type-button-s-line-height);
  letter-spacing: var(--type-button-s-tracking);
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
  white-space: nowrap;
  flex-shrink: 0;
}

.module-start-btn:hover {
  background-color: var(--button-primary-hover);
}

.module-start-btn:active {
  background-color: var(--button-primary-pressed);
  transition: none;
}

.module-start-btn__icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* --- Divider (reused from sidebar) ----------------------------------------- */
.module-toc .sidebar-divider {
  margin: 0;
}

/* --- Responsive ------------------------------------------------------------- */
@media (max-width: 1024px) {
  .modules-section {
    padding: var(--spacing-xxxl) var(--spacing-xxxl) var(--spacing-xxxl);
  }

  .modules-intro {
    margin: calc(-1 * var(--spacing-xxxl)) calc(-1 * var(--spacing-xxxl)) 0;
    padding: var(--spacing-xxxl);
  }
}

@media (max-width: 768px) {
  .modules-section {
    padding: var(--spacing-xxxl) var(--spacing-l) var(--spacing-xxxl);
  }

  .modules-intro {
    margin: calc(-1 * var(--spacing-xxxl)) calc(-1 * var(--spacing-l)) 0;
    padding: var(--spacing-xxxl) var(--spacing-l);
  }

  .modules-intro__title {
    font-size: 32px;
    line-height: var(--type-h1-line-height);
  }

  .modules-subtitle {
    font-size: 16px;
  }

  .module-card {
    flex-direction: column;
  }

  .module-card-content {
    display: flex;
    gap: 0;      /* 32px between left and right columns */
    align-items: normal;
  }

  .module-card__title {
    font-size: 24px;
  }

  .module-card__sidebar-col {
    width: 100%;
    justify-content: right;
  }

  .module-card__image {
    min-height: 220px;
  }
}