:root {
  --hc-max: 1200px;
  --hc-sidebar: 264px;
  --hc-audit: 420px;
}

.hc-body { font-family: var(--font-sans, "Inter", system-ui, sans-serif); }

.hc-header {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--color-surface-0, #fff) 85%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--color-surface-200, #e5e7eb);
}
.hc-header-inner {
  max-width: var(--hc-max); margin: 0 auto;
  display: flex; align-items: center; gap: 1.25rem;
  padding: 0.75rem 1.5rem;
}
.hc-brand { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; flex: none; }
.hc-logo {
  display: grid; place-items: center; width: 30px; height: 30px;
  border-radius: 8px; font-weight: 800; font-size: 15px; color: #fff;
  background: linear-gradient(135deg, var(--color-brand-500, #f59e0b), var(--color-brand-700, #b45309));
  box-shadow: var(--shadow-card-sm, 0 1px 2px rgba(0,0,0,.06));
}
.hc-brand-text { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em; color: var(--color-surface-900, #111827); }
.hc-brand-sub { color: var(--color-brand-600, #d97706); margin-left: 2px; font-weight: 600; }
.hc-search { position: relative; flex: 1; max-width: 520px; }
.hc-search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--color-surface-400, #676f7c); }
.hc-search-input {
  width: 100%; padding: 0.55rem 0.9rem 0.55rem 2.4rem;
  border: 1px solid var(--color-surface-200, #e5e7eb); border-radius: 10px;
  background: var(--color-surface-0, #fff);

  font-size: 1rem; color: var(--color-surface-900, #111827);
  transition: border-color var(--duration-fast, 140ms) var(--ease-crate-out, cubic-bezier(.215, .61, .355, 1)),
              box-shadow var(--duration-fast, 140ms) var(--ease-crate-out, cubic-bezier(.215, .61, .355, 1));
}
.hc-search-input:focus {

  outline: 2px solid var(--color-surface-900, #111827); outline-offset: 2px;
  border-color: var(--color-brand-400, #fbbf24);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-brand-400, #fbbf24) 45%, transparent);
}
.hc-header-nav { margin-left: auto; flex: none; }
.hc-header-link { font-size: 0.85rem; font-weight: 600; color: var(--color-surface-600, #4b5563); text-decoration: none; }
.hc-header-link:hover { color: var(--color-brand-700, #b45309); }

.hc-main { max-width: var(--hc-max); margin: 0 auto; padding: 2rem 1.5rem 4rem; }
.hc-flash { margin-bottom: 1rem; padding: 0.7rem 1rem; border-radius: 10px; font-size: 0.875rem; font-weight: 500; }
.hc-flash-ok   { background: var(--color-brand-50, #fffbeb); color: var(--color-brand-800, #92400e); border: 1px solid var(--color-brand-200, #fde68a); }
.hc-flash-warn { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

.hc-hero { text-align: center; padding: 2rem 0 2.5rem; }
.hc-hero h1 { font-size: 2.25rem; font-weight: 700; letter-spacing: -0.03em; color: var(--color-surface-900, #111827); }
.hc-hero p { margin-top: 0.6rem; color: var(--color-surface-600, #4b5563); font-size: 1.05rem; }
.hc-hero .hc-search { margin: 1.75rem auto 0; max-width: 560px; }

.hc-cat-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 1rem; margin-top: 1rem;
}
.hc-cat-card {
  display: block; text-decoration: none; padding: 1.25rem 1.35rem;
  background: var(--color-surface-0, #fff); border: 1px solid var(--color-surface-200, #e5e7eb);
  border-radius: 14px;
  transition: border-color var(--duration-fast, 140ms) var(--ease-crate-out, cubic-bezier(.215, .61, .355, 1)),
              box-shadow var(--duration-fast, 140ms) var(--ease-crate-out, cubic-bezier(.215, .61, .355, 1)),
              transform var(--duration-instant, 80ms) var(--ease-crate-out, cubic-bezier(.215, .61, .355, 1));
}
.hc-cat-card:hover { border-color: var(--color-brand-300, #fcd34d); box-shadow: var(--shadow-card, 0 1px 3px rgba(0,0,0,.08)); transform: translateY(-1px); }
.hc-cat-icon {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px;
  background: var(--color-brand-50, #fffbeb); color: var(--color-brand-600, #d97706); margin-bottom: 0.75rem;
}

.hc-cat-card h2,
.hc-cat-card h3 { font-size: 1.05rem; font-weight: 650; color: var(--color-surface-900, #111827); }
.hc-cat-card .hc-cat-count { font-size: 0.8rem; color: var(--color-surface-500, #5a626f); margin-top: 0.2rem; }
.hc-cat-card .hc-cat-peek { margin-top: 0.7rem; font-size: 0.82rem; color: var(--color-surface-600, #4b5563); line-height: 1.5; }

.hc-article-wrap { display: grid; grid-template-columns: var(--hc-sidebar) minmax(0, 1fr); gap: 2.5rem; align-items: start; }
.hc-article-wrap.hc-has-audit { grid-template-columns: var(--hc-sidebar) minmax(0, 1fr) var(--hc-audit); }

.hc-sidenav { position: sticky; top: 84px; font-size: 0.875rem; }
.hc-sidenav h4 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-surface-500, #5a626f); font-weight: 700; margin: 1rem 0 0.4rem; }
.hc-sidenav a { display: block; padding: 0.3rem 0.6rem; border-radius: 7px; color: var(--color-surface-600, #4b5563); text-decoration: none; }
.hc-sidenav a:hover { background: var(--color-surface-100, #f3f4f6); color: var(--color-surface-900, #111827); }
.hc-sidenav a.is-active { background: var(--color-brand-50, #fffbeb); color: var(--color-brand-800, #92400e); font-weight: 600; }

.hc-breadcrumb { font-size: 0.8rem; color: var(--color-surface-500, #5a626f); margin-bottom: 0.75rem; }
.hc-breadcrumb a { color: var(--color-surface-600, #4b5563); text-decoration: none; }
.hc-breadcrumb a:hover { color: var(--color-brand-700, #b45309); }

.hc-article h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.025em; color: var(--color-surface-900, #111827); }
.hc-article .hc-summary { margin-top: 0.6rem; font-size: 1.1rem; color: var(--color-surface-600, #4b5563); line-height: 1.6; }
.hc-meta-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.hc-badge { display: inline-flex; align-items: center; gap: 0.3rem; padding: 0.2rem 0.6rem; border-radius: 999px; font-size: 0.72rem; font-weight: 600; }
.hc-badge-web    { background: var(--color-surface-100, #f3f4f6); color: var(--color-surface-700, #374151); }
.hc-badge-mobile { background: #eef2ff; color: #3730a3; }
.hc-badge-video  { background: var(--color-brand-50, #fffbeb); color: var(--color-brand-700, #b45309); }

.hc-prose { margin-top: 1.5rem; max-width: 720px; }
.hc-prose .hc-p { color: var(--color-surface-700, #374151); line-height: 1.7; margin: 0.9rem 0; }
.hc-prose .hc-h2 { font-size: 1.4rem; font-weight: 700; color: var(--color-surface-900); margin: 2rem 0 0.6rem; letter-spacing: -0.02em; }
.hc-prose .hc-h3 { font-size: 1.12rem; font-weight: 650; color: var(--color-surface-900); margin: 1.5rem 0 0.5rem; }
.hc-prose .hc-link { color: var(--color-brand-700, #b45309); text-decoration: underline; text-underline-offset: 2px; }
.hc-prose .hc-ul, .hc-prose .hc-ol { margin: 0.9rem 0 0.9rem 1.2rem; color: var(--color-surface-700); line-height: 1.7; }
.hc-prose .hc-ul { list-style: disc; } .hc-prose .hc-ol { list-style: decimal; }
.hc-prose .hc-inline-code { font-family: var(--font-mono, monospace); font-size: 0.85em; background: var(--color-surface-100, #f3f4f6); padding: 0.1em 0.35em; border-radius: 5px; }
.hc-prose .hc-code { background: var(--color-surface-900, #111827); color: #e5e7eb; padding: 0.9rem 1rem; border-radius: 10px; overflow-x: auto; font-family: var(--font-mono, monospace); font-size: 0.82rem; margin: 1rem 0; }
.hc-prose .hc-callout { border-left: 3px solid var(--color-brand-400, #fbbf24); background: var(--color-brand-50, #fffbeb); padding: 0.75rem 1rem; border-radius: 0 8px 8px 0; color: var(--color-brand-900, #78350f); margin: 1rem 0; }

.hc-video { margin: 1.75rem 0; }
.hc-video video { width: 100%; border-radius: 12px; border: 1px solid var(--color-surface-200, #e5e7eb); box-shadow: var(--shadow-card, 0 1px 3px rgba(0,0,0,.08)); background: #000; }
.hc-video figcaption { margin-top: 0.5rem; font-size: 0.8rem; color: var(--color-surface-500, #5a626f); }

.hc-steps { margin-top: 2rem; counter-reset: hc-step; }
.hc-step { display: grid; grid-template-columns: 2rem 1fr; gap: 0.9rem; padding: 1.4rem 0; border-top: 1px solid var(--color-surface-200, #e5e7eb); }
.hc-step:first-child { border-top: none; }
.hc-step-num {
  width: 2rem; height: 2rem; border-radius: 50%; display: grid; place-items: center;
  background: var(--color-brand-600, #d97706); color: #fff; font-weight: 700; font-size: 0.85rem;
}
.hc-step-title { font-size: 1.05rem; font-weight: 650; color: var(--color-surface-900, #111827); }
.hc-step-body { margin-top: 0.35rem; color: var(--color-surface-700, #374151); line-height: 1.65; }
.hc-shots { margin-top: 0.9rem; display: flex; flex-wrap: wrap; gap: 1rem; }
.hc-shot { flex: 1 1 320px; min-width: 0; }
.hc-shot img { width: 100%; border-radius: 10px; border: 1px solid var(--color-surface-200, #e5e7eb); box-shadow: var(--shadow-card-sm, 0 1px 2px rgba(0,0,0,.06)); }
.hc-shot-label { margin-top: 0.4rem; font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-surface-500, #5a626f); }
.hc-shot-mobile { flex: 0 0 240px; }

.hc-audit { position: sticky; top: 84px; max-height: calc(100dvh - 110px); overflow: auto; }
.hc-audit-card { background: var(--color-surface-0, #fff); border: 1px solid var(--color-surface-200, #e5e7eb); border-radius: 14px; overflow: hidden; }
.hc-audit-head { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 1rem; background: var(--color-surface-900, #111827); color: #fff; }
.hc-audit-head h3 { font-size: 0.82rem; font-weight: 700; letter-spacing: 0.03em; text-transform: uppercase; }
.hc-audit-status { font-size: 0.72rem; padding: 0.15rem 0.55rem; border-radius: 999px; font-weight: 700; }
.hc-audit-status.is-done { background: var(--color-brand-400, #fbbf24); color: var(--color-surface-900, #111827); }
.hc-audit-status.is-todo { background: var(--color-surface-700, #374151); color: #d1d5db; }
.hc-audit-body { padding: 1rem; }
.hc-audit-row { font-size: 0.82rem; color: var(--color-surface-600, #4b5563); margin-bottom: 0.6rem; }
.hc-audit-row strong { color: var(--color-surface-900, #111827); }
.hc-audit-spec { display: block; font-family: var(--font-mono, monospace); font-size: 0.74rem; word-break: break-all; color: var(--color-brand-700, #b45309); text-decoration: none; background: var(--color-surface-50, #fbfbfc); border: 1px solid var(--color-surface-200, #e5e7eb); border-radius: 8px; padding: 0.5rem 0.65rem; }
.hc-audit-spec:hover { border-color: var(--color-brand-300, #fcd34d); }
.hc-source-pre { max-height: 320px; overflow: auto; background: var(--color-surface-900, #111827); color: #cbd5e1; font-family: var(--font-mono, monospace); font-size: 0.72rem; line-height: 1.5; padding: 0.8rem; border-radius: 10px; margin-top: 0.75rem; }
.hc-btn { display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.5rem 0.9rem; border-radius: 9px; font-size: 0.82rem; font-weight: 600; cursor: pointer; border: 1px solid transparent; }
.hc-btn-done { width: 100%; justify-content: center; background: var(--color-brand-600, #d97706); color: #fff; }
.hc-btn-done:hover { background: var(--color-brand-700, #b45309); }
.hc-btn-undo { width: 100%; justify-content: center; background: var(--color-surface-100, #f3f4f6); color: var(--color-surface-800, #1f2937); border-color: var(--color-surface-300, #d1d5db); }
.hc-audit-progress { margin-top: 1rem; }
.hc-progress-bar { height: 7px; border-radius: 999px; background: var(--color-surface-200, #e5e7eb); overflow: hidden; }
.hc-progress-fill { height: 100%; background: linear-gradient(90deg, var(--color-brand-400, #fbbf24), var(--color-brand-600, #d97706)); }
.hc-progress-label { margin-top: 0.4rem; font-size: 0.72rem; color: var(--color-surface-500, #5a626f); }
.hc-audit-toggle { margin-top: 0.75rem; }

.hc-audit-collapsed { display: none; }

.hc-footer { border-top: 1px solid var(--color-surface-200, #e5e7eb); margin-top: 3rem; }
.hc-footer-inner { max-width: var(--hc-max); margin: 0 auto; padding: 1.5rem; display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--color-surface-500, #5a626f); }
.hc-footer-dim { color: var(--color-surface-400, #676f7c); }

@media (max-width: 1080px) {
  .hc-article-wrap, .hc-article-wrap.hc-has-audit { grid-template-columns: 1fr; }
  .hc-sidenav { position: static; max-height: none; }
  .hc-audit { position: static; max-height: none; }
}
@media (max-width: 640px) {
  .hc-header-inner { flex-wrap: wrap; gap: 0.75rem; }
  .hc-search { order: 3; flex-basis: 100%; max-width: none; }
  .hc-hero h1 { font-size: 1.7rem; }
  .hc-shot-mobile { flex-basis: 100%; }
}