/* ============================================================
   Learnbuilt document preview component
   - .doc-hero      : static band of 3 tilted document covers (top of page)
   - .doc-preview   : interactive "look inside" viewer (tabs + thumbs + lightbox)
   Reuses the product-page design tokens (--bg, --card, --green, etc.)
   ============================================================ */

/* ---------- hero mockup band ---------- */
.doc-hero { padding: 8px 0 4px; }
.doc-hero-inner {
  display: flex; justify-content: center; align-items: flex-end;
  gap: clamp(10px, 3vw, 36px); perspective: 1400px;
}
.doc-hero figure {
  margin: 0; transition: transform .35s ease, box-shadow .35s ease;
  filter: drop-shadow(0 30px 50px rgba(0,0,0,.55));
}
.doc-hero img {
  display: block; width: clamp(130px, 18vw, 215px); height: auto;
  border-radius: 8px; border: 1px solid var(--border-hi);
  background: #fff;
}
.doc-hero figure:nth-child(1) { transform: rotate(-6deg) translateY(14px); }
.doc-hero figure:nth-child(2) { transform: translateY(-6px) scale(1.06); z-index: 2; }
.doc-hero figure:nth-child(3) { transform: rotate(6deg) translateY(14px); }
.doc-hero-inner:hover figure:nth-child(1) { transform: rotate(-3deg) translateY(6px); }
.doc-hero-inner:hover figure:nth-child(3) { transform: rotate(3deg) translateY(6px); }
.doc-hero figcaption {
  font-family: var(--mono); font-size: 10px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--text-3); text-align: center; margin-top: 10px;
}
@media (max-width: 680px) {
  .doc-hero figure:nth-child(1),
  .doc-hero figure:nth-child(3) { display: none; }
  .doc-hero figure:nth-child(2) { transform: none; scale: 1; }
}

/* ---------- interactive viewer ---------- */
.doc-preview .dp-tabs {
  display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px;
}
.dp-tab {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  color: var(--text-2); background: var(--card); border: 1px solid var(--border);
  padding: 8px 14px; border-radius: 100px; cursor: pointer; transition: all .2s;
}
.dp-tab:hover { color: var(--text); border-color: var(--border-hi); }
.dp-tab.is-active {
  color: #06100A; background: var(--green); border-color: var(--green); font-weight: 700;
}

.dp-stage { display: grid; grid-template-columns: 92px 1fr; gap: 18px; align-items: start; }
.dp-thumbs { display: flex; flex-direction: column; gap: 10px; }
.dp-thumb {
  position: relative; padding: 0; border: 1px solid var(--border); border-radius: 6px;
  overflow: hidden; cursor: pointer; background: #fff; line-height: 0; transition: border-color .2s;
}
.dp-thumb img { width: 100%; height: auto; display: block; opacity: .72; transition: opacity .2s; }
.dp-thumb:hover img { opacity: 1; }
.dp-thumb.is-active { border-color: var(--green); }
.dp-thumb.is-active img { opacity: 1; }
.dp-thumb-n {
  position: absolute; top: 3px; left: 3px; font-family: var(--mono); font-size: 9px;
  color: var(--text); background: rgba(6,16,10,.7); padding: 1px 5px; border-radius: 4px;
}

.dp-main {
  position: relative; border: 1px solid var(--border-hi); border-radius: 12px;
  overflow: hidden; background: #fff; line-height: 0;
  box-shadow: 0 24px 50px -24px rgba(0,0,0,.6);
}
.dp-main img { width: 100%; height: auto; display: block; cursor: zoom-in; }
.dp-zoom-hint {
  position: absolute; bottom: 10px; right: 10px; font-family: var(--mono); font-size: 10px;
  color: #fff; background: rgba(6,16,10,.72); padding: 4px 9px; border-radius: 100px;
  pointer-events: none; display: flex; align-items: center; gap: 5px;
}
.dp-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); width: 40px; height: 40px;
  border-radius: 50%; border: none; background: rgba(6,16,10,.6); color: #fff;
  font-size: 20px; cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background .2s; backdrop-filter: blur(4px);
}
.dp-arrow:hover { background: var(--green); color: #06100A; }
.dp-arrow.prev { left: 12px; }
.dp-arrow.next { right: 12px; }
.dp-arrow[disabled] { opacity: 0; pointer-events: none; }

.dp-caption {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  margin-top: 14px; font-family: var(--mono); font-size: 12px; color: var(--text-3);
}
.dp-caption .dp-counter { color: var(--text-2); }
.dp-caption b { color: var(--green); font-weight: 500; }

@media (max-width: 680px) {
  .dp-stage { grid-template-columns: 1fr; }
  .dp-thumbs { flex-direction: row; overflow-x: auto; order: 2; padding-bottom: 4px; }
  .dp-thumb { flex: 0 0 64px; }
  .dp-main { order: 1; }
}

/* ---------- lightbox ---------- */
.dp-lightbox {
  position: fixed; inset: 0; z-index: 1000; display: none;
  background: rgba(3,8,5,.92); backdrop-filter: blur(6px);
  align-items: center; justify-content: center; padding: 4vh 4vw;
}
.dp-lightbox.is-open { display: flex; }
.dp-lightbox img {
  max-width: 100%; max-height: 92vh; width: auto; border-radius: 8px;
  box-shadow: 0 40px 80px rgba(0,0,0,.7); background: #fff;
}
.dp-lb-close {
  position: absolute; top: 18px; right: 22px; font-size: 30px; line-height: 1;
  color: var(--text-2); background: none; border: none; cursor: pointer;
}
.dp-lb-close:hover { color: var(--text); }
.dp-lb-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); width: 52px; height: 52px;
  border-radius: 50%; border: 1px solid var(--border-hi); background: rgba(16,31,20,.85);
  color: var(--text); font-size: 26px; cursor: pointer;
}
.dp-lb-arrow:hover { color: var(--green); border-color: var(--green); }
.dp-lb-arrow.prev { left: 3vw; }
.dp-lb-arrow.next { right: 3vw; }