/* ═══════════════════════════════════════════════════════════
   SOFTLINE DEFENCE — v3.1 UI ADDITIONS
   Уніфікований hero, TOC scroll-spy, accordion, tabs, helpers.
   Працює поверх softline.css + softline-v3.css.
   ═══════════════════════════════════════════════════════════ */

/* ───────────────────────────────────────
   1. УНІФІКОВАНИЙ HERO — три варіанти
   .sd-hero            — базовий клас, єдиний фон і структура
   .sd-hero--home      — більший (головна)
   .sd-hero--landing   — середній (landing розділу: KB, References, Glossary)
   .sd-hero--doc       — компактний (single doc, single article)
   ─────────────────────────────────────── */
.sd-hero {
  background: linear-gradient(135deg, var(--c-dark) 0%, #182019 60%, var(--c-primary) 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  padding: 88px 0 56px;
  border-bottom: 1px solid var(--c-border);
}
.sd-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.014) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.014) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}
.sd-hero::after {
  content: '';
  position: absolute;
  top: -160px;
  right: -120px;
  width: 520px;
  height: 520px;
  background: var(--c-accent);
  opacity: .06;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
}
.sd-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
}
.sd-hero__mark {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 22px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.sd-hero__mark::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--c-accent);
  flex-shrink: 0;
}
.sd-hero__mark .sd-hero__mark-divider {
  width: 1px;
  height: 12px;
  background: rgba(143,163,118,.4);
}
.sd-hero h1 {
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -1px;
  margin-bottom: 22px;
  color: #fff;
}
.sd-hero h1 em {
  font-style: normal;
  color: var(--c-accent-hover);
}
.sd-hero__sub {
  font-size: 17px;
  line-height: 1.65;
  color: rgba(255,255,255,.7);
  max-width: 680px;
  margin-bottom: 28px;
}
.sd-hero__sub a {
  color: var(--c-accent-hover);
  border-bottom: 1px solid transparent;
  transition: border-color .15s;
}
.sd-hero__sub a:hover {
  border-bottom-color: var(--c-accent-hover);
}
.sd-hero__cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 0;
}
.sd-hero__credit {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: 13.5px;
  color: rgba(255,255,255,.4);
  line-height: 1.6;
}
.sd-hero__credit a {
  color: var(--c-accent-hover);
  border-bottom: 1px solid transparent;
  transition: border-color .15s;
}
.sd-hero__credit a:hover { border-bottom-color: var(--c-accent-hover); }

/* Мета — для doc-варіанту (час читання, складність) */
.sd-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-family: var(--mono);
  font-size: 12px;
  color: rgba(255,255,255,.55);
  letter-spacing: .04em;
}
.sd-hero__meta strong {
  color: var(--c-accent-hover);
  font-weight: 700;
  margin-right: 4px;
}

/* Варіанти */
.sd-hero--home {
  padding: 96px 0 80px;
}
.sd-hero--home h1 {
  font-size: clamp(34px, 4.8vw, 56px);
}
.sd-hero--home .sd-hero__inner {
  max-width: 760px;
}

.sd-hero--landing {
  padding: 76px 0 56px;
}
.sd-hero--landing h1 {
  font-size: clamp(30px, 4vw, 44px);
}

.sd-hero--doc {
  padding: 60px 0 40px;
}
.sd-hero--doc h1 {
  font-size: clamp(26px, 3.6vw, 38px);
}
.sd-hero--doc .sd-hero__sub {
  font-size: 16.5px;
}

@media (max-width: 768px) {
  .sd-hero { padding: 56px 0 36px; }
  .sd-hero--home { padding: 64px 0 48px; }
  .sd-hero--home h1 { font-size: 30px; }
  .sd-hero--landing { padding: 56px 0 36px; }
  .sd-hero--landing h1 { font-size: 26px; }
  .sd-hero--doc { padding: 48px 0 32px; }
  .sd-hero--doc h1 { font-size: 24px; }
  .sd-hero__sub { font-size: 15.5px; }
  .sd-hero__meta { gap: 14px; font-size: 11.5px; }
}

/* ───────────────────────────────────────
   2. ХЛІБНІ КРИХТИ в hero (універсальні)
   ─────────────────────────────────────── */
.sd-hero__crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: .06em;
  color: rgba(255,255,255,.45);
  margin-bottom: 18px;
}
.sd-hero__crumbs a {
  color: rgba(255,255,255,.55);
  transition: color .15s;
}
.sd-hero__crumbs a:hover { color: var(--c-accent-hover); }
.sd-hero__crumbs span.sep { color: rgba(255,255,255,.25); }

/* ───────────────────────────────────────
   3. DOC LAYOUT — TOC sticky + scroll-spy
   Двоколонна верстка: sidebar TOC + content
   ─────────────────────────────────────── */
.sd-doc {
  padding: 56px 0 80px;
}
.sd-doc__grid {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 64px;
  align-items: start;
}
.sd-doc__grid--left {
  grid-template-columns: 260px 1fr;
}

/* Sidebar TOC */
.sd-toc {
  position: sticky;
  top: 88px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 4px;
}
.sd-toc__label {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--c-divider);
}
.sd-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sd-toc__item {
  display: block;
}
.sd-toc__link {
  display: block;
  padding: 7px 12px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--c-text-muted);
  border-left: 2px solid transparent;
  transition: all .15s;
  cursor: pointer;
  text-decoration: none;
}
.sd-toc__link:hover {
  color: var(--c-accent);
  border-left-color: var(--c-accent-border);
}
.sd-toc__link.is-active {
  color: var(--c-accent);
  border-left-color: var(--c-accent);
  background: var(--c-accent-subtle);
  font-weight: 600;
}
.sd-toc__link--h3 {
  padding-left: 24px;
  font-size: 12.5px;
  color: var(--c-text-secondary);
}
.sd-toc__link--h3.is-active {
  background: transparent;
}
.sd-toc__num {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--c-accent);
  margin-right: 8px;
  font-weight: 700;
  letter-spacing: .05em;
}

.sd-toc__divider {
  height: 1px;
  background: var(--c-divider);
  margin: 14px 0;
}

.sd-toc__progress {
  margin-bottom: 16px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--c-text-muted);
  letter-spacing: .06em;
  padding-left: 12px;
}
.sd-toc__progress-bar {
  height: 2px;
  background: var(--c-divider);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 6px;
}
.sd-toc__progress-fill {
  height: 100%;
  background: var(--c-accent);
  width: 0%;
  transition: width .25s ease;
}

/* Content area */
.sd-doc__content {
  min-width: 0;
}

/* Anchor heading hover */
.sd-doc__content h2,
.sd-doc__content h3 {
  scroll-margin-top: 96px;
  position: relative;
}
.sd-anchor-link {
  position: absolute;
  left: -28px;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  opacity: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--c-text-muted);
  transition: opacity .15s, color .15s;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 14px;
}
.sd-doc__content h2:hover .sd-anchor-link,
.sd-doc__content h3:hover .sd-anchor-link {
  opacity: 1;
}
.sd-anchor-link:hover { color: var(--c-accent); }

@media (max-width: 1080px) {
  .sd-doc__grid,
  .sd-doc__grid--left {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .sd-toc {
    position: static;
    max-height: none;
    overflow: visible;
    background: var(--c-bg-elevated);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 24px;
  }
  .sd-toc__label { padding-left: 0; border-left: none; margin-bottom: 10px; }
  .sd-anchor-link { display: none; }
}

/* ───────────────────────────────────────
   4. ACCORDION — для довгих розділів
   ─────────────────────────────────────── */
.sd-accordion {
  border-top: 1px solid var(--c-divider);
}
.sd-acc-item {
  border-bottom: 1px solid var(--c-divider);
}
.sd-acc-trigger {
  width: 100%;
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  padding: 20px 48px 20px 0;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-heading);
  display: flex;
  align-items: flex-start;
  gap: 14px;
  position: relative;
  transition: color .15s;
  line-height: 1.4;
}
.sd-acc-trigger:hover { color: var(--c-accent); }
.sd-acc-trigger:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
}
.sd-acc-num {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: .08em;
  flex-shrink: 0;
  padding-top: 3px;
  min-width: 36px;
}
.sd-acc-title { flex: 1; }
.sd-acc-icon {
  position: absolute;
  right: 4px;
  top: 22px;
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform .25s ease;
  color: var(--c-text-muted);
  flex-shrink: 0;
}
.sd-acc-icon::before {
  content: '+';
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 400;
  line-height: 1;
}
.sd-acc-item.is-open .sd-acc-icon {
  color: var(--c-accent);
  transform: rotate(45deg);
}
.sd-acc-item.is-open .sd-acc-trigger {
  color: var(--c-accent);
}
.sd-acc-body {
  display: none;
  padding: 0 0 24px 50px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--c-text-secondary);
}
.sd-acc-item.is-open .sd-acc-body { display: block; }
.sd-acc-body p { margin-bottom: 14px; }
.sd-acc-body p:last-child { margin-bottom: 0; }
.sd-acc-body ul, .sd-acc-body ol { margin: 0 0 14px 22px; padding: 0; }
.sd-acc-body li { margin-bottom: 6px; }

@media (max-width: 640px) {
  .sd-acc-trigger { padding: 16px 40px 16px 0; font-size: 15px; gap: 10px; }
  .sd-acc-num { min-width: 28px; font-size: 11px; }
  .sd-acc-body { padding: 0 0 20px 38px; font-size: 14.5px; }
}

/* ───────────────────────────────────────
   5. TAB STRIP — для груп розділів
   ─────────────────────────────────────── */
.sd-tabs {
  margin: 28px 0;
}
.sd-tabs__nav {
  display: flex;
  border-bottom: 1px solid var(--c-divider);
  margin-bottom: 24px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.sd-tabs__btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 14px 22px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  border-bottom: 2px solid transparent;
  transition: all .15s;
  margin-bottom: -1px;
  white-space: nowrap;
  flex-shrink: 0;
}
.sd-tabs__btn:hover {
  color: var(--c-accent);
}
.sd-tabs__btn.is-active {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}
.sd-tabs__panel {
  display: none;
}
.sd-tabs__panel.is-active {
  display: block;
}

/* ───────────────────────────────────────
   6. ХЛІБНІ КРИХТИ ВНИЗУ СТАТТІ + Prev/Next
   ─────────────────────────────────────── */
.sd-doc-foot {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--c-divider);
}
.sd-doc-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 32px;
}
.sd-doc-nav-link {
  display: block;
  padding: 20px 24px;
  background: var(--c-bg-elevated);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all .2s;
}
.sd-doc-nav-link:hover {
  border-color: var(--c-accent-border);
  background: var(--c-surface);
  transform: translateY(-2px);
}
.sd-doc-nav-link--prev { text-align: left; }
.sd-doc-nav-link--next { text-align: right; }
.sd-doc-nav-dir {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-accent);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.sd-doc-nav-title {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--c-heading);
  line-height: 1.4;
}

@media (max-width: 640px) {
  .sd-doc-nav { grid-template-columns: 1fr; }
  .sd-doc-nav-link--next { text-align: left; }
}

/* ───────────────────────────────────────
   7. READING META BADGE — час, складність
   На картках та у hero
   ─────────────────────────────────────── */
.sd-meta-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.sd-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--c-text-muted);
  background: var(--c-bg-elevated);
  border: 1px solid var(--c-divider);
  padding: 4px 10px;
  border-radius: 4px;
  text-transform: uppercase;
}
.sd-meta-badge--time { color: var(--c-text-secondary); }
.sd-meta-badge--easy { color: var(--c-accent-hover); border-color: var(--c-accent-border); }
.sd-meta-badge--medium { color: #d1a85b; border-color: rgba(193,156,72,.3); }
.sd-meta-badge--hard { color: #c19c48; border-color: rgba(193,156,72,.4); }

/* ───────────────────────────────────────
   8. COPY HINT — для кнопок копіювання якоря
   ─────────────────────────────────────── */
.sd-copy-hint {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--c-accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 10000;
  box-shadow: var(--shadow-lg);
}
.sd-copy-hint.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ───────────────────────────────────────
   9. PRINT-FRIENDLY (бонус)
   ─────────────────────────────────────── */
@media print {
  .sd-hero { background: none !important; color: #000; padding: 20px 0; border-bottom: 2px solid #000; }
  .sd-hero h1, .sd-hero__sub, .sd-hero__mark { color: #000; }
  .sd-toc, .sd-doc-foot, .header, .footer, .callout-impl { display: none; }
  .sd-doc__grid, .sd-doc__grid--left { grid-template-columns: 1fr; }
  .edu-prose { max-width: 100%; }
}