*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:#1f2937;line-height:1.6;background:#f9fafb;min-height:100vh;display:flex;flex-direction:column}
.hc-container{max-width:1100px;margin:0 auto;padding:0 24px;width:100%}

/* Header */
.hc-header{background:var(--hc-primary);color:#fff;padding:14px 0}
.hc-header .hc-container{display:flex;align-items:center;justify-content:space-between;gap:24px}
.hc-logo{color:#fff;text-decoration:none;font-size:1.2rem;font-weight:700}
.hc-nav{display:flex;gap:24px}
.hc-nav a{color:rgba(255,255,255,.92);text-decoration:none;font-size:.92rem}
.hc-nav a:hover{color:#fff}

/* Hero */
.hc-hero{background:linear-gradient(135deg,var(--hc-primary),color-mix(in srgb,var(--hc-primary) 80%,#000));color:#fff;padding:64px 0 56px;text-align:center}
.hc-hero h1{font-size:2.4rem;font-weight:700;margin-bottom:14px;letter-spacing:-.02em}
.hc-hero p{font-size:1.05rem;opacity:.92;margin-bottom:30px}
.hc-search{max-width:640px;margin:0 auto;position:relative}
.hc-search input{width:100%;padding:15px 20px 15px 48px;font-size:1rem;border:none;border-radius:10px;box-shadow:0 6px 20px rgba(0,0,0,.18);outline:none}
.hc-search input:focus{box-shadow:0 8px 28px rgba(0,0,0,.24)}
.hc-search::before{content:'🔍';position:absolute;left:16px;top:50%;transform:translateY(-50%);font-size:1.05rem;opacity:.6}

/* Main */
.hc-main{flex:1;padding-bottom:48px}
.hc-section{margin-top:48px}
.hc-section h2{font-size:1.4rem;font-weight:600;margin-bottom:18px;color:#111827}

/* Categories grid */
.hc-categories{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.hc-category{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:22px;text-decoration:none;color:inherit;transition:all .18s;display:block}
.hc-category:hover{border-color:var(--hc-primary);box-shadow:0 4px 16px rgba(0,0,0,.08);transform:translateY(-2px)}
.hc-cat-icon{width:38px;height:38px;background:rgba(0,0,0,.04);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.3rem;margin-bottom:12px}
.hc-category h3{font-size:1rem;font-weight:600;margin-bottom:4px;color:#111827}
.hc-category p{font-size:.82rem;color:#6b7280}

/* Article list */
.hc-articles{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden}
.hc-article-link{display:flex;align-items:center;padding:14px 20px;border-bottom:1px solid #f3f4f6;text-decoration:none;color:inherit;transition:background .12s}
.hc-article-link:last-child{border-bottom:none}
.hc-article-link:hover{background:#f9fafb}
.hc-article-link h4{font-size:.95rem;font-weight:500;color:#111827;flex:1;margin-right:12px}
.hc-views{color:#9ca3af;font-size:.78rem;margin-right:14px}
.hc-arrow{color:var(--hc-primary);font-size:1.2rem}

/* Article view */
.hc-article-page{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:32px;padding:48px 0}
.hc-article-view{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:40px;min-width:0}
.hc-breadcrumb{font-size:.85rem;color:#6b7280;margin-bottom:14px}
.hc-breadcrumb a{color:var(--hc-primary);text-decoration:none}
.hc-breadcrumb a:hover{text-decoration:underline}
.hc-article-view h1{font-size:1.7rem;font-weight:700;color:#111827;margin-bottom:10px;letter-spacing:-.01em}
.hc-article-meta{color:#9ca3af;font-size:.8rem;margin-bottom:24px;padding-bottom:24px;border-bottom:1px solid #e5e7eb}
.hc-article-body{font-size:1rem;line-height:1.7;color:#374151}
.hc-article-body h2,.hc-article-body h3{margin:28px 0 12px;color:#111827;font-weight:600}
.hc-article-body h2{font-size:1.35rem}
.hc-article-body h3{font-size:1.1rem}
.hc-article-body p{margin-bottom:16px}
.hc-article-body ul,.hc-article-body ol{margin:12px 0 16px 24px}
.hc-article-body li{margin-bottom:6px}
.hc-article-body a{color:var(--hc-primary)}
.hc-article-body img{max-width:100%;height:auto;border-radius:6px;margin:12px 0}
.hc-article-body code{background:#f3f4f6;padding:2px 6px;border-radius:3px;font-size:.9em;font-family:ui-monospace,Menlo,monospace}
.hc-article-body pre{background:#1f2937;color:#f9fafb;padding:14px;border-radius:6px;overflow-x:auto;margin:16px 0}

/* Helpful */
.hc-helpful{margin-top:36px;padding:18px;background:#f9fafb;border-radius:8px;text-align:center}
.hc-helpful p{margin-bottom:10px;font-size:.9rem;color:#6b7280}
.hc-helpful button{background:#fff;border:1px solid #d1d5db;padding:7px 16px;border-radius:6px;font-size:.88rem;cursor:pointer;margin:0 4px;transition:all .15s}
.hc-helpful button:hover{border-color:var(--hc-primary)}
.hc-helpful button.voted{background:var(--hc-primary);color:#fff;border-color:var(--hc-primary)}

/* Sidebar */
.hc-sidebar{align-self:start;position:sticky;top:24px}
.hc-sidebar h4{font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:#9ca3af;font-weight:600;margin-bottom:10px}
.hc-sidebar ul{list-style:none;padding:0}
.hc-sidebar li{margin-bottom:8px}
.hc-sidebar a{color:#374151;text-decoration:none;font-size:.9rem;line-height:1.4;display:block}
.hc-sidebar a:hover{color:var(--hc-primary)}

/* Search */
.hc-search-form{margin-bottom:24px}
.hc-search-form input{width:100%;padding:14px 18px;border:1px solid #d1d5db;border-radius:8px;font-size:1rem;outline:none}
.hc-search-form input:focus{border-color:var(--hc-primary)}
.hc-search-results{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden}
.hc-search-result{padding:18px 20px;border-bottom:1px solid #f3f4f6;text-decoration:none;color:inherit;display:block;transition:background .12s}
.hc-search-result:last-child{border-bottom:none}
.hc-search-result:hover{background:#f9fafb}
.hc-search-result h3{font-size:1rem;color:var(--hc-primary);margin-bottom:5px}
.hc-excerpt{color:#6b7280;font-size:.86rem;line-height:1.5}

/* Empty state */
.hc-empty{padding:56px 24px;text-align:center;color:#6b7280;background:#fff;border:1px solid #e5e7eb;border-radius:10px}
.hc-empty-icon{font-size:2.6rem;margin-bottom:14px;opacity:.4}
.hc-empty h3{font-size:1.1rem;color:#374151;margin-bottom:8px;font-weight:600}

/* Footer */
.hc-footer{background:#fff;border-top:1px solid #e5e7eb;padding:20px 0;color:#6b7280;font-size:.86rem;margin-top:auto}
.hc-footer .hc-container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px}
.hc-footer a{color:var(--hc-primary);text-decoration:none}
.hc-footer a:hover{text-decoration:underline}

/* Mobile */
@media (max-width:768px){
  .hc-hero{padding:40px 16px 32px}
  .hc-hero h1{font-size:1.7rem}
  .hc-article-page{grid-template-columns:1fr;padding:32px 0}
  .hc-sidebar{position:static;margin-top:24px}
  .hc-article-view{padding:24px}
  .hc-nav{gap:16px;font-size:.85rem}
}