/* ==========================================================================
   Learn: courses hub & documentation shell (docs.datavendor-style)
   ========================================================================== */

.docs-page {
  background: var(--bg-docs);
  scroll-behavior: auto !important;
}

html:has(.docs-page) {
  scroll-behavior: auto !important;
}

/* ---------- Tab row ---------- */
.docs-tabs { position: sticky; top: var(--header-h); z-index: 50; background: var(--bg-docs); border-bottom: 1px solid var(--line); }
.docs-tabs-inner { display: flex; align-items: center; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.docs-tabs-inner::-webkit-scrollbar { display: none; }
.docs-tab {
  position: relative; display: inline-flex; align-items: center; gap: 8px; padding: 14px 10px 13px;
  color: var(--muted); font: 500 0.92rem/1 var(--font-text); text-decoration: none; white-space: nowrap;
  transition: color 0.15s;
}
.docs-tab:hover { color: var(--ink); }
.docs-tab.is-active { color: var(--ink); font-weight: 600; }
.docs-tab.is-active::after { content: ""; position: absolute; left: 6px; right: 6px; bottom: -1px; height: 2px; background: var(--ink); border-radius: 2px; }

/* ---------- Courses hub ---------- */
.courses-hub-shell { background: var(--bg-docs); }
.courses-hub-container { padding-block: clamp(40px, 7vw, 72px) 96px; }
.courses-hub-head { max-width: 760px; margin-bottom: clamp(28px, 4vw, 44px); }
.courses-hub-head .docs-eyebrow { color: var(--ink); }
.courses-hub-title { font-size: clamp(2.5rem, 5.4vw, 3.8rem); line-height: 1.05; letter-spacing: -0.04em; margin-top: 8px; }
.courses-hub-lead { margin-top: 18px; color: var(--muted); font-size: 1.15rem; line-height: 1.65; max-width: 58ch; }

.courses-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; align-items: stretch; }
.course-card-featured {
  height: 100%; display: flex; flex-direction: column;
  border: 1px solid var(--card-border); border-radius: var(--radius-l);
  background: var(--card-bg); transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.course-card-featured:hover { border-color: var(--tc-line, var(--card-hover-border)); box-shadow: var(--card-hover-shadow); }
.course-card-top { padding: 28px 28px 20px; }
.course-card-header-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.course-badge {
  display: inline-flex; align-items: center; gap: 7px; padding: 4px 10px; border-radius: 8px;
  background: var(--tc-bg, var(--surface-3)); color: var(--tc, var(--ink-soft));
  font: 500 0.74rem var(--font-mono); letter-spacing: 0.04em; text-transform: uppercase;
}
.course-duration { font: 400 0.82rem var(--font-text); color: var(--muted); }
.course-card-title { margin-top: 22px; font-size: clamp(1.5rem, 2.4vw, 1.9rem); }
.course-card-desc { margin-top: 10px; color: var(--muted); line-height: 1.65; font-size: 0.97rem; }

.course-card-curriculum { flex: 1; padding: 8px 20px 8px; border-top: 1px solid var(--line); margin-inline: 8px; }
.curriculum-head { color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; font: 500 0.7rem var(--font-mono); padding: 16px 8px 8px; }
.curriculum-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 2px; }
.curriculum-list li a { display: flex; align-items: center; gap: 10px; border-radius: 10px; padding: 10px 8px; color: var(--ink-soft); text-decoration: none; font-size: 0.93rem; transition: background-color 0.15s, color 0.15s; }
.curriculum-list li a:hover { background: var(--surface-2); color: var(--ink); }
.curriculum-icon { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: var(--tc-bg, var(--surface-3)); color: var(--tc, var(--muted)); flex-shrink: 0; }
.curriculum-item-title { flex: 1; font-weight: 500; }
.curriculum-count { font-size: 0.76rem !important; color: var(--muted) !important; }
.course-card-actions { padding: 12px 28px 28px; margin-top: auto; }
.course-start-btn { width: 100%; }

/* ---------- Docs shell ---------- */
.docs-shell { padding-block: 0 80px; }
.docs-shell .wrap { width: min(100% - 2 * var(--gutter), 1320px); }
.docs-container { display: grid; grid-template-columns: 290px minmax(0, 1fr) 230px; gap: 0; align-items: start; }

/* Sidebar (full-height divider on the right) */
.docs-sidebar { align-self: stretch; border-right: 1px solid var(--line); padding-right: 10px; }
.docs-sidebar-inner {
  position: sticky; top: calc(var(--header-h) + 50px);
  max-height: calc(100vh - var(--header-h) - 50px); overflow-y: auto; padding: 28px 8px 32px 0; scrollbar-width: thin;
}
.docs-sidebar-header { padding-bottom: 14px; margin-bottom: 14px; border-bottom: 1px solid var(--line); }
.docs-course-badge-box { padding-left: 10px; }
.docs-course-chip { display: inline-block; padding: 3px 8px; border-radius: 7px; background: var(--tc-bg, var(--surface-3)); color: var(--tc, var(--ink-soft)); font: 500 0.68rem var(--font-mono); letter-spacing: 0.05em; text-transform: uppercase; }
.docs-course-title { margin-top: 10px; font-size: 1.2rem; letter-spacing: -0.03em; }

.docs-nav-group { margin-bottom: 1.6rem; }
.docs-group-title { display: block; font: 600 0.82rem var(--font-text); color: var(--ink); margin: 0 0 8px 10px; }
.docs-group-items { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.docs-nav-item {
  display: flex; align-items: center; gap: 12px; padding: 8px 12px; border-radius: 12px;
  font: 400 0.92rem/1.35 var(--font-text); color: var(--muted); text-decoration: none;
  transition: background-color 0.15s, color 0.15s;
}
.docs-nav-item .nav-icon { display: inline-flex; color: var(--muted); flex-shrink: 0; }
.docs-nav-item:hover { color: var(--ink); }
.docs-nav-item.is-active { background: var(--surface-3); color: var(--ink); font-weight: 500; }
.docs-nav-item.is-active .nav-icon { color: var(--ink); }

/* Article */
.docs-main { min-width: 0; width: 100%; max-width: 820px; margin-inline: auto; padding: 48px clamp(20px, 4vw, 48px) 0; }
.docs-head-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 0.5rem; }
.docs-eyebrow { display: block; font: 600 0.9rem var(--font-text); color: var(--ink); margin-bottom: 0.9rem; }
.docs-head-text h1 { font-size: clamp(2.2rem, 4.4vw, 3rem); line-height: 1.08; letter-spacing: -0.04em; }
.docs-copy-page-btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px;
  background: transparent; border: 1px solid var(--line-strong); border-radius: 12px;
  color: var(--ink); font: 500 0.85rem var(--font-text); cursor: pointer; white-space: nowrap; flex-shrink: 0; margin-top: 18px;
  transition: background-color 0.15s;
}
.docs-copy-page-btn:hover { background: var(--surface-2); }
.docs-lead { color: var(--muted); font-size: 1.2rem; line-height: 1.6; margin: 10px 0 2.25rem; max-width: 60ch; }
.docs-main .prose { font-size: 1.02rem; line-height: 1.85; }
.docs-main .prose h2 { border-bottom: 0; padding-bottom: 0; margin-top: 2.6em; font-size: clamp(1.5rem, 2.8vw, 1.9rem); }

/* Resource cards */
.docs-resource-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin: 1.25rem 0 2rem; }
.docs-resource-card {
  display: flex; flex-direction: column; gap: 8px; padding: 24px;
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius-l);
  text-decoration: none !important; color: var(--ink) !important; font-weight: 400 !important;
  transition: border-color 0.16s, transform 0.16s, box-shadow 0.16s;
}
.docs-resource-card:hover { transform: translateY(-2px); border-color: var(--tc-line, var(--accent)); box-shadow: var(--card-hover-shadow); }
.docs-resource-card .card-icon { display: inline-flex; margin-bottom: 14px; color: var(--tc, var(--ink)); }
.docs-resource-card h3 { font: 600 1.05rem/1.3 var(--font-text); letter-spacing: -0.01em; margin: 0 !important; color: var(--ink); }
.docs-resource-card p { margin: 0 !important; font-size: 0.93rem; line-height: 1.6; color: var(--muted); }
.docs-resource-grid .docs-resource-card:nth-child(6n+1) { --tc: var(--amber);   --tc-line: var(--amber-line); }
.docs-resource-grid .docs-resource-card:nth-child(6n+2) { --tc: var(--sky);     --tc-line: var(--sky-line); }
.docs-resource-grid .docs-resource-card:nth-child(6n+3) { --tc: var(--olive);   --tc-line: var(--olive-line); }
.docs-resource-grid .docs-resource-card:nth-child(6n+4) { --tc: var(--fig);     --tc-line: var(--fig-line); }
.docs-resource-grid .docs-resource-card:nth-child(6n+5) { --tc: var(--heather); --tc-line: var(--heather-line); }
.docs-resource-grid .docs-resource-card:nth-child(6n+6) { --tc: var(--orange);  --tc-line: var(--orange-line); }

/* Feedback / pager / bottom */
.docs-feedback-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 4rem; padding-top: 1.5rem; }
.docs-feedback-row > span { font: 400 0.92rem var(--font-text); color: var(--muted); }
.docs-feedback-btns { display: flex; gap: 10px; }
.docs-vote-btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 9px 18px;
  background: transparent; border: 1px solid var(--line-strong); border-radius: 12px;
  color: var(--ink-soft); font: 500 0.88rem var(--font-text); cursor: pointer; transition: background-color 0.15s, border-color 0.15s;
}
.docs-vote-btn:hover { background: var(--surface-2); border-color: var(--muted); color: var(--ink); }

.docs-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 2.25rem; }
.docs-pager-card {
  display: flex; flex-direction: column-reverse; gap: 4px; padding: 18px 22px;
  background: transparent; border: 1px solid var(--card-border); border-radius: var(--radius-m);
  text-decoration: none; transition: border-color 0.16s, background-color 0.16s;
}
.docs-pager-card:hover { border-color: var(--accent); background: var(--surface); }
.docs-pager-card.next { text-align: right; align-items: flex-end; }
.docs-pager-card .pager-title { font: 500 1.02rem/1.3 var(--font-text); color: var(--ink); }
.docs-pager-card .pager-direction { font: 400 0.85rem var(--font-text); color: var(--muted); }

.docs-bottom-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.docs-socials { display: flex; gap: 18px; align-items: center; }
.docs-socials a { color: var(--muted); display: inline-flex; transition: color 0.15s; }
.docs-socials a:hover { color: var(--ink); }
.docs-powered { font: 400 0.88rem var(--font-text); color: var(--muted); }
.docs-powered strong { color: var(--ink-soft); font-weight: 600; }

/* Right TOC */
.docs-toc-col { display: none; }
@media (min-width: 1100px) {
  .docs-toc-col { display: block; position: sticky; top: calc(var(--header-h) + 50px); align-self: start; padding: 48px 0 0 8px; max-height: calc(100vh - var(--header-h) - 50px); overflow-y: auto; scrollbar-width: none; }
  .docs-toc-col::-webkit-scrollbar { display: none; }
  .docs-toc-head { display: flex; align-items: center; gap: 10px; font: 500 0.9rem var(--font-text); color: var(--ink); margin-bottom: 14px; }
  .docs-toc-list { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line-strong); }
  .docs-toc-list a { display: block; padding: 7px 0 7px 18px; margin-left: -1px; border-left: 2px solid transparent; font: 400 0.9rem/1.4 var(--font-text); color: var(--muted); text-decoration: none; transition: color 0.15s, border-color 0.15s; }
  .docs-toc-list a:hover { color: var(--ink); }
  .docs-toc-list a[aria-current="true"] { color: var(--ink); border-left-color: var(--ink); font-weight: 600; }
}

/* Responsive */
@media (max-width: 1180px) {
  .docs-container { grid-template-columns: 260px minmax(0, 1fr); }
}
@media (max-width: 900px) {
  .courses-grid { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .docs-container { grid-template-columns: minmax(0, 1fr); }
  .docs-sidebar { border-right: 0; border-bottom: 1px solid var(--line); padding: 0; }
  .docs-sidebar-inner { position: static; max-height: none; padding: 14px 0 10px; }
  .docs-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 14px; }
  .docs-nav-group { margin-bottom: 0.6rem; }
  .docs-main { padding: 24px 0 0; }
}
@media (max-width: 700px) {
  .courses-hub-container { padding-block: 24px 48px !important; }
  .courses-hub-title { font-size: clamp(2rem, 8vw, 2.8rem) !important; }
  .courses-hub-lead { font-size: 0.98rem !important; margin-top: 10px !important; }
  .course-card-top { padding: 18px 18px 12px !important; }
  .course-card-title { margin-top: 12px !important; font-size: 1.35rem !important; }
  .course-card-desc { font-size: 0.9rem !important; margin-top: 6px !important; }
  .course-card-actions { padding: 10px 18px 18px !important; }
  .docs-shell { padding-block: 0 40px !important; }
  .docs-main { padding: 16px 0 0 !important; }
  .docs-nav { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .docs-head-top { flex-direction: column; gap: 8px; }
  .docs-head-text h1 { font-size: clamp(1.85rem, 7.5vw, 2.5rem); }
  .docs-copy-page-btn { margin-top: 4px; align-self: flex-start; }
  .docs-lead { font-size: 0.98rem; margin: 8px 0 1.5rem; }
  .docs-resource-grid { grid-template-columns: 1fr; gap: 10px; margin: 1rem 0 1.5rem; }
  .docs-resource-card { padding: 14px 16px; border-radius: 12px; }
  .docs-feedback-row { margin-top: 2rem; padding-top: 1rem; }
  .docs-pager { grid-template-columns: 1fr; gap: 10px; margin-top: 1.5rem; }
  .docs-pager-card { padding: 14px 16px; }
  .docs-pager-card.next { text-align: left; align-items: flex-start; }
  .docs-bottom-foot { margin-top: 2.25rem; padding-top: 1.25rem; flex-direction: column; gap: 12px; align-items: flex-start; }
}