/* ============================================================
   Collections listing: hero + sidebar filters + card grid.
   Client-side filtering (assets/js/collections.js).
   ============================================================ */

/* ---- Hero ---- */
.col-hero {
  padding: calc(var(--space-24) + 60px) 0 var(--space-10);
  text-align: center;
}
.col-hero .corp-wrap { max-width: 820px; }
.col-hero .cphero-eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--type-overline);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-brand);
  margin-bottom: var(--space-4);
}
.col-hero h1 { color: var(--text-primary); }
.col-hero .cphero-lead {
  margin: var(--space-4) auto 0;
  max-width: 60ch;
  font-size: var(--type-body-lg);
  color: var(--text-secondary);
}

/* ---- Layout ---- */
.col-section { padding: var(--space-8) 0 var(--space-24); }
.col-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-12);
  align-items: start;
}

/* ---- Sidebar filters ---- */
.col-filters {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.col-filters-body { display: flex; flex-direction: column; gap: var(--space-6); }
.col-filters-head { display: flex; align-items: center; justify-content: space-between; }
.col-filters-heading {
  font-family: var(--font-display);
  font-size: var(--type-h3);
  color: var(--text-primary);
}
.col-filters-close { display: none; background: none; border: 0; font-size: 28px; line-height: 1; color: var(--text-primary); cursor: pointer; }

.col-filter-group { border-top: 1px solid var(--surface-border-subtle); padding-top: var(--space-5); }
.col-filter-title {
  font-family: var(--font-body);
  font-size: var(--type-overline);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}
.col-filter-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.col-filter-check {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--type-body);
  color: var(--text-primary);
  cursor: pointer;
}
.col-filter-check input { accent-color: var(--color-brand); width: 16px; height: 16px; }

.col-clear {
  align-self: flex-start;
  background: none;
  border: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--type-body-sm);
  color: var(--text-brand);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.col-apply { display: none; }

/* ---- Main header ---- */
.col-main-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.col-search {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 420px;
}
.col-search svg { position: absolute; left: 14px; width: 18px; height: 18px; color: var(--text-muted); pointer-events: none; }
.col-search input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) 44px;
  border: 1px solid var(--surface-border-subtle);
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--type-body);
  color: var(--text-primary);
  background: var(--surface-glass-card);
}
.col-search input:focus { outline: none; border-color: var(--color-brand); }
.col-count {
  flex-shrink: 0;
  font-family: var(--font-body);
  font-size: var(--type-body-sm);
  color: var(--text-secondary);
}

/* ---- Grid + cards ---- */
.col-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}
.col-card[hidden] { display: none !important; }
.col-card {
  opacity: 0;
  transform: translateY(24px);
  border-radius: var(--radius-card);
  overflow: hidden;
  cursor: pointer;
  transition: opacity .5s ease, transform .5s ease;
}
.col-card.is-revealed { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .col-card { opacity: 1; transform: none; transition: none; }
}
.col-card.is-revealed:hover { transform: translateY(-4px); }

/* Media fills the full card */
.col-card-media {
  position: relative;
  aspect-ratio: 3 / 4;
  overflow: hidden;
}
.col-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.col-card:hover .col-card-media img { transform: scale(1.06); }

/* Subtle bottom-to-top gradient */
.col-card-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.18) 40%, transparent 65%);
  pointer-events: none;
  z-index: 1;
}

/* Pills — top left */
.col-card-pills {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  z-index: 2;
}
.col-card-pill {
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.16);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--type-spec);
  letter-spacing: 0.04em;
  text-transform: capitalize;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.28);
}

/* Footer overlay — name + download */
.col-card-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  z-index: 2;
}
.col-card-name {
  font-family: var(--font-display);
  font-size: var(--type-h2);
  color: #fff;
  line-height: 1.2;
  flex: 1;
  min-width: 0;
}

/* Download button */
.col-card-dl {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: var(--radius-btn);
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.32);
  color: #fff;
  font-family: var(--font-body);
  font-size: var(--type-body-sm);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background .2s ease, border-color .2s ease;
}
.col-card-dl:hover { background: rgba(255,255,255,0.28); border-color: rgba(255,255,255,0.55); color: #fff; }
.col-card-dl svg { width: 15px; height: 15px; }

.col-empty { text-align: center; color: var(--text-secondary); padding: var(--space-16) 0; }

/* Desktop: download button hidden, appears on card hover */
@media (hover: hover) and (pointer: fine) {
  .col-card-dl {
    opacity: 0;
    transform: translateY(5px);
    transition: opacity .22s ease, transform .22s ease, background .2s ease, border-color .2s ease;
  }
  .col-card:hover .col-card-dl {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- Mobile sticky filter bar (hidden on desktop) ---- */
.col-filter-bar { display: none; }

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .col-layout { grid-template-columns: 1fr; }

  /* Sidebar becomes a full-screen modal: fixed head, scrolling body, fixed
     footer button. The drawer itself does NOT scroll — only .col-filters-body
     does — so the footer stays put regardless of scroll position. */
  .col-filters {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1200;
    background: var(--surface-canvas);
    padding: var(--space-6) var(--layout-margin-mob)
             calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    overflow: hidden;
    transform: translateY(100%);
    transition: transform .3s ease;
    gap: var(--space-4);
  }
  .col-filters.is-open { transform: translateY(0); }
  .col-filters-close { display: block; }

  .col-filters-head { flex: 0 0 auto; }

  .col-filters-body {
    flex: 1 1 auto;
    min-height: 0;          /* allow the flex child to shrink and scroll */
    overflow-y: auto;
    padding-bottom: var(--space-4);
  }

  .col-apply {
    flex: 0 0 auto;         /* static footer, outside the scroll area */
    display: block;
    width: 100%;
    margin: 0;
    padding: var(--space-4);
    border: 0;
    border-radius: var(--radius-btn);
    background: var(--color-brand);
    color: #fff;
    font-family: var(--font-body);
    cursor: pointer;
    box-shadow: 0 -6px 20px rgba(0, 0, 0, 0.12);
  }

  .col-filter-bar {
    display: block;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1100;
    padding: var(--space-3) var(--layout-margin-mob);
    background: var(--surface-glass-overlay);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--surface-border-subtle);
  }
  .col-filter-toggle { width: 100%; justify-content: center; }
}
@media (max-width: 560px) {
  .col-grid { grid-template-columns: 1fr; }
  .col-main-head { flex-direction: column; align-items: stretch; }
  .col-search { max-width: none; }
}