/* AI-Nav — visual system v2: indigo/violet brand, sticky blur header, cards, dark footer */
:root{
  --ink:#16181d; --muted:#5b6472; --line:#e7eaf0; --bg:#ffffff;
  --soft:#f6f8fb; --brand:#4F46E5; --brand-dark:#4338C4; --violet:#7C3AED;
  --star:#e8a13a; --radius:12px; --maxw:1080px; --measure:68ch;
  --footer-bg:#14161f; --footer-ink:#c7ccd6; --footer-mute:#9aa1ad;
  --shadow:0 6px 24px rgba(79,70,229,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:17px;
  -webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.86);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:22px;padding-top:10px;padding-bottom:10px;min-height:64px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink);flex:none}
.brand:hover{text-decoration:none}
.brand-mark{width:34px;height:34px;flex:none;display:block}
.brand-text{display:block;line-height:1.15}
.wordmark{display:block;font-weight:800;font-size:20px;letter-spacing:-.03em}
.slogan{display:block;font-size:11px;color:var(--muted);letter-spacing:.01em;white-space:nowrap}
nav.main{display:flex;gap:18px;margin-left:auto;font-size:15px;align-items:center}
nav.main a{color:var(--ink);font-weight:600;white-space:nowrap}
nav.main a:hover{color:var(--brand);text-decoration:none}
@media(max-width:640px){
  .site-header .wrap{flex-wrap:wrap;gap:8px 16px}
  .slogan{display:none}
  nav.main{margin-left:0;width:100%;overflow-x:auto;gap:14px;font-size:13.5px;padding-bottom:2px}
}

/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,#ebeffe 0%,#f1ebfd 55%,#f8f4fe 100%);
  padding:68px 0 52px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(560px 220px at 50% -60px,rgba(124,58,237,.14),transparent 70%)}
.hero .wrap{position:relative}
.hero h1{font-size:clamp(32px,5.4vw,52px);line-height:1.12;margin:0 0 10px;letter-spacing:-.03em}
.hero-slogan{font-size:clamp(17px,2.4vw,21px);font-weight:700;color:var(--brand-dark);margin:0 0 10px}
.hero-sub{color:var(--muted);max-width:38rem;margin:0 auto 26px;font-size:17px}
.hero .btn-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ---------- buttons ---------- */
.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:700;
  padding:12px 28px;border-radius:10px;border:0;cursor:pointer;font-size:16px;
  transition:background .15s ease,transform .15s ease}
.btn:hover{background:var(--brand-dark);text-decoration:none;color:#fff;transform:translateY(-1px)}
.btn:disabled{background:#b9b3f0;cursor:not-allowed;transform:none}
.btn-ghost{background:#fff;color:var(--brand-dark);border:1.5px solid var(--brand)}
.btn-ghost:hover{background:#eef0fe;color:var(--brand-dark)}
.cta-row{margin:28px 0}
.cta-row a{display:inline-block;background:var(--brand);color:#fff;font-weight:700;
  padding:13px 30px;border-radius:10px;transition:background .15s ease,transform .15s ease}
.cta-row a:hover{background:var(--brand-dark);color:#fff;text-decoration:none;transform:translateY(-1px)}
.prose a.aff{font-weight:600;color:var(--brand-dark)}

/* ---------- cards ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px;margin:28px 0}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:20px;background:#fff;
  display:flex;flex-direction:column;gap:9px;transition:box-shadow .2s ease,transform .2s ease}
.card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.card .kicker{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}
.card h3{margin:0;font-size:19px;line-height:1.35;letter-spacing:-.01em}
.card h3 a{color:var(--ink)}
.card h3 a:hover{color:var(--brand-dark);text-decoration:none}
.card p{margin:0;color:var(--muted);font-size:15px;flex:1}
.card-meta{display:flex;gap:10px;align-items:center;font-size:13px;color:var(--muted);margin-top:2px}
.type-badge{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.06em;
  background:#eef0fe;color:var(--brand-dark);border-radius:20px;padding:3px 11px}
.section-title{font-size:24px;margin:44px 0 6px;letter-spacing:-.02em}
.section-sub{color:var(--muted);margin:0 0 6px}

/* ---------- article layout ---------- */
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:36px;margin:32px 0;align-items:start}
@media(max-width:900px){.article-grid{grid-template-columns:1fr}}
aside.sidebar{position:sticky;top:88px;z-index:1}
@media(max-width:900px){aside.sidebar{position:static}}
.prose{max-width:var(--measure);min-width:0}
.prose>h1{font-size:clamp(28px,4vw,38px);line-height:1.2;letter-spacing:-.02em;margin:0 0 4px}
.prose h2{font-size:24px;margin:40px 0 12px;letter-spacing:-.01em;padding-top:10px;border-top:1px solid var(--line)}
.prose h2:first-child{border-top:0;margin-top:0;padding-top:0}
.prose h3{font-size:19px;margin:26px 0 8px}
.prose table{width:100%;border-collapse:collapse;margin:20px 0;font-size:15px;display:block;overflow-x:auto;
  border:1px solid var(--line);border-radius:10px}
.prose th,.prose td{border:0;border-bottom:1px solid var(--line);padding:11px 14px;text-align:left;white-space:normal}
.prose thead th{background:#eef0fe;color:var(--brand-dark);font-weight:700;border-bottom:2px solid #d9dcfb;white-space:nowrap}
.prose tbody tr:last-child th,.prose tbody tr:last-child td{border-bottom:0}
.prose tbody tr:nth-child(even){background:#fafbfe}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin:6px 0}
.breadcrumb{font-size:14px;color:var(--muted);margin:20px 0 0}
.breadcrumb a{color:var(--muted)}
.article-meta{color:var(--muted);font-size:14px;margin:10px 0 22px}
.rating{color:var(--star);font-weight:800;letter-spacing:.05em}

/* disclosure callout — amber tint */
.disclosure{background:#fff8e6;border:1px solid #f0dfae;border-left:4px solid #e8a13a;border-radius:10px;
  padding:13px 18px;font-size:14px;color:#6b5b2a;margin:0 0 26px}
.disclosure a{color:#8a6d1f;font-weight:600}

/* verdict box */
.verdict{background:linear-gradient(180deg,#eef0fe,#f6f3ff);border:1px solid #d9dcfb;
  border-radius:var(--radius);padding:22px 24px;margin:30px 0}
.verdict h2{border:0;margin:0 0 10px;padding:0;font-size:22px}
.verdict p:last-child{margin-bottom:0}

/* FAQ accordions */
details.faq{border:1px solid var(--line);border-radius:10px;margin:10px 0;background:#fff;overflow:hidden}
details.faq summary{cursor:pointer;font-weight:700;padding:14px 18px;list-style:none;display:flex;
  align-items:center;justify-content:space-between;gap:12px}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--brand);font-size:20px;font-weight:800;flex:none}
details.faq[open] summary::after{content:"\2212"}
details.faq summary:hover{color:var(--brand-dark)}
details.faq>*:not(summary){margin-left:18px;margin-right:18px}
details.faq>*:last-child{margin-bottom:16px}

/* sidebar */
.sidebar .box{border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:18px;background:#fff}
.sidebar h4{margin:0 0 10px;font-size:16px;letter-spacing:-.01em}
.sidebar ul{margin:0;padding-left:18px;font-size:14px}
.sidebar li{margin:7px 0}
.sidebar li a{color:var(--ink)}
.sidebar li a:hover{color:var(--brand-dark)}

/* newsletter */
.newsletter{background:linear-gradient(180deg,#eef0fe,#f7f4ff);border:1px solid #d9dcfb;
  border-radius:var(--radius);padding:28px;margin:44px 0;text-align:center}
.newsletter h3{margin:0 0 8px;font-size:21px;letter-spacing:-.01em}
.newsletter p{color:var(--muted);margin:0 0 16px}
.newsletter form{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.newsletter input[type=email]{padding:11px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;min-width:240px;background:#fff}
.note{font-size:13px;color:var(--muted)}

/* ---------- deals ---------- */
.deal{border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin:16px 0;display:flex;
  gap:18px;align-items:flex-start;flex-wrap:wrap;background:#fff;transition:box-shadow .2s ease}
.deal:hover{box-shadow:var(--shadow)}
.deal .info{flex:1;min-width:240px}
.deal h3{margin:0 0 6px;font-size:20px;letter-spacing:-.01em}
.deal p{margin:6px 0;color:var(--muted);font-size:15px}
.deal .btn{flex:none;align-self:center}
.badge{display:inline-block;font-size:12px;font-weight:700;background:#e6f4ea;color:#1a7f37;
  border-radius:20px;padding:4px 13px;margin-bottom:10px}

/* ---------- submit form ---------- */
.submit-form{max-width:640px;display:grid;gap:14px;margin:24px 0}
.submit-form label{font-weight:700;font-size:14px;display:grid;gap:6px}
.submit-form input,.submit-form select,.submit-form textarea{padding:11px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;background:#fff;font-family:inherit;color:inherit}
.submit-form textarea{min-height:96px;resize:vertical}
.submit-form .btn{justify-self:start;border:none;cursor:pointer;font-size:16px}

/* ---------- footer (dark) ---------- */
.site-footer{background:var(--footer-bg);color:var(--footer-ink);margin-top:64px;padding:44px 0 30px}
.site-footer .wrap{display:flex;flex-direction:column;gap:26px}
.footer-top{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;align-items:flex-start}
.brand-footer .wordmark{color:#fff}
.slogan-footer{color:var(--footer-mute)}
.site-footer nav{display:flex;gap:8px 20px;flex-wrap:wrap;font-size:14px;max-width:34rem}
.site-footer nav a{color:var(--footer-ink)}
.site-footer nav a:hover{color:#fff;text-decoration:none}
.footer-note{font-size:13px;color:var(--footer-mute);max-width:44rem;margin:0}
.footer-note a{color:#d7dbe3;font-weight:600}

/* ---------- small screens ---------- */
@media(max-width:480px){
  body{font-size:16px}
  .hero{padding:52px 0 40px}
  .newsletter input[type=email]{min-width:0;width:100%}
  .deal .btn{width:100%;text-align:center}
}

/* ---- product directory ---- */
.p-filters{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0 8px}
.p-filters input[type=search]{flex:2;min-width:200px;padding:10px 14px;border:1px solid #e2e8f0;border-radius:10px;font-size:15px}
.p-filters select{padding:10px 12px;border:1px solid #e2e8f0;border-radius:10px;font-size:14px;background:#fff}
.p-count{color:#64748b;font-size:13px;margin:4px 0 16px}
.p-card{border:1px solid #eef2f7;border-radius:14px;padding:18px;background:#fff;display:flex;flex-direction:column;gap:8px}
.p-card-top{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.p-card-top h3{margin:0;font-size:17px}
.p-card-top h3 a{color:#0f172a;text-decoration:none}
.p-card-top h3 a:hover{color:#4f46e5}
.p-stars{white-space:nowrap;font-weight:700;color:#b45309;font-size:14px}
.p-tag{margin:0;color:#475569;font-size:14px;line-height:1.5}
.p-card-meta{display:flex;gap:10px;flex-wrap:wrap;align-items:center;font-size:13px;margin-top:auto}
.p-cat{background:#eef2ff;color:#4f46e5;border-radius:999px;padding:3px 10px;font-size:12px;font-weight:600}
.p-card-meta a{color:#4f46e5;text-decoration:none}
.p-review{font-weight:600}
.p-dead{color:#b91c1c;font-size:12px}
.p-facts{display:flex;gap:18px;flex-wrap:wrap;margin:14px 0;font-size:14px;color:#334155}
.p-facts .note{color:#94a3b8;font-size:12px}
.p-notice{background:#fef9c3;border:1px solid #fde68a;border-radius:10px;padding:10px 14px;font-size:14px;color:#854d0e}
.p-review-box{background:#eef2ff;border:1px solid #c7d2fe;border-radius:12px;padding:16px 18px;margin:22px 0}
.p-review-box h4{margin:0 0 6px}
.p-review-box p{margin:0}

/* ---- product detail enrichment ---- */
.p-hero{display:flex;gap:28px;align-items:center;margin:6px 0 8px;flex-wrap:wrap}
.p-hero-text{flex:1;min-width:260px}
.p-hero-text h1{margin:0 0 8px}
.p-hero-img{width:min(340px,100%);border-radius:16px;box-shadow:0 8px 28px rgba(79,70,229,.18)}
.p-feat{margin:8px 0 4px;padding-left:20px;line-height:1.65}
.p-feat li{margin:4px 0}
.p-pills{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.p-pill{background:#f1f5f9;color:#334155;border-radius:999px;padding:4px 12px;font-size:12.5px}
.p-pill.p-stack{background:#e0e7ff;color:#3730a3;font-weight:600}
.p-quick{background:#0f172a;color:#e2e8f0;border-radius:12px;padding:16px 18px;overflow-x:auto;font-size:13.5px;line-height:1.6}
.p-thumb{width:44px;height:44px;border-radius:10px;object-fit:cover;flex:none}
.p-card-top{align-items:center}
@media(max-width:640px){.p-hero-img{width:100%}}

/* ---- product screenshots gallery ---- */
.p-gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:10px 0 4px}
.p-gallery a{display:block;border:1px solid #eef2f7;border-radius:12px;overflow:hidden;background:#f8fafc}
.p-gallery img{width:100%;height:170px;object-fit:cover;object-position:top;display:block;transition:transform .2s}
.p-gallery a:hover img{transform:scale(1.02)}

/* ---------- UI quality pass v3 ---------- */
/* nav: active pill + animated underline */
nav.main a{position:relative;padding:6px 2px;border-radius:6px;transition:color .18s ease}
nav.main a::after{content:"";position:absolute;left:2px;right:2px;bottom:0;height:2px;border-radius:2px;
  background:var(--brand);transform:scaleX(0);transform-origin:left;transition:transform .22s ease}
nav.main a:hover::after{transform:scaleX(1)}
nav.main a.active{color:var(--brand-dark)}
nav.main a.active::after{transform:scaleX(1)}
nav.main a:focus-visible{outline:2px solid var(--brand);outline-offset:3px}

/* whitespace rhythm */
.wrap{padding:0 24px}
.grid{gap:20px;margin:32px 0}
.card{padding:22px}
.section-sub{margin:0 0 16px}
.breadcrumb{margin:24px 0 4px}
.prose>h1{margin:6px 0 8px}
.prose h2{margin:44px 0 14px}
.p-filters{margin:24px 0 10px}
.p-count{margin:6px 0 20px}

/* product sidebar layout */
.p-layout{display:grid;grid-template-columns:232px minmax(0,1fr);gap:36px;align-items:start;margin-top:8px}
.p-side{position:sticky;top:88px;max-height:calc(100vh - 110px);overflow:auto;
  border:1px solid var(--line);border-radius:14px;background:#fff;padding:10px}
.p-cat-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.p-cat-item button{width:100%;display:flex;justify-content:space-between;align-items:center;gap:10px;
  background:none;border:0;cursor:pointer;padding:8px 12px;border-radius:9px;
  font-size:14px;color:var(--ink);text-align:left;transition:background .15s ease,color .15s ease}
.p-cat-item button:hover{background:#f1f3f9}
.p-cat-item button.active{background:#eef0fe;color:var(--brand-dark);font-weight:700}
.p-cat-item button:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.p-cat-count{flex:none;font-size:11px;font-weight:700;color:var(--muted);background:var(--soft);
  border:1px solid var(--line);border-radius:999px;padding:1px 8px}
.p-cat-item button.active .p-cat-count{color:var(--brand-dark);border-color:#d9dcfb}
.p-filters-single{margin:0 0 10px}
.p-filters-single input{max-width:100%}
@media (max-width:900px){
  .p-layout{grid-template-columns:1fr;gap:18px}
  .p-side{position:static;max-height:none;padding:8px}
  .p-cat-list{flex-direction:row;overflow-x:auto;scrollbar-width:thin;padding-bottom:2px}
  .p-cat-item{flex:none}
  .p-cat-item button{white-space:nowrap;border:1px solid var(--line)}
  .p-cat-item button.active{border-color:var(--brand)}
}

/* micro-interactions */
.card,.p-card,.deal{transition:box-shadow .22s ease,transform .22s ease,border-color .22s ease}
.card:hover,.p-card:hover{border-color:#d9dcfb}
.btn:hover,.cta-row a:hover{box-shadow:0 8px 20px rgba(79,70,229,.28)}
.p-filters input[type=search],.p-filters select{transition:border-color .18s ease,box-shadow .18s ease}
.p-filters input[type=search]:focus,.p-filters select:focus{outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(79,70,229,.14)}
.newsletter input[type=email]:focus,.submit-form input:focus,.submit-form select:focus,.submit-form textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.14)}

/* FAQ open animation */
@keyframes faqIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
details.faq[open]>:not(summary){animation:faqIn .24s ease}
details.faq summary{transition:background .18s ease;border-radius:10px}
details.faq summary:hover{background:#f6f8fb}

/* gallery + thumbs */
.p-gallery a{transition:transform .2s ease,box-shadow .2s ease}
.p-gallery a:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.p-gallery img{transition:transform .25s ease}

/* sidebar link micro-interaction */
.sidebar li a{transition:color .15s ease,padding-left .15s ease}
.sidebar li a:hover{padding-left:3px}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

/* back to top */
#toTop{position:fixed;right:22px;bottom:22px;z-index:60;width:44px;height:44px;border-radius:50%;
  border:1px solid var(--line);background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  color:var(--brand-dark);font-size:20px;cursor:pointer;box-shadow:0 6px 20px rgba(20,22,31,.12);
  opacity:0;pointer-events:none;transform:translateY(8px);transition:opacity .25s ease,transform .25s ease}
#toTop.show{opacity:1;pointer-events:auto;transform:none}
#toTop:hover{background:var(--brand);color:#fff;border-color:var(--brand)}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ---------- skills channel ---------- */
.sk-trend{border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,#f7f8ff,#fff);
  padding:18px 22px;margin:0 0 26px}
.sk-trend h2{margin:0 0 10px;font-size:17px}
.sk-trend ol{margin:0;padding-left:22px;display:flex;flex-direction:column;gap:6px}
.sk-trend li::marker{font-weight:700;color:var(--brand-dark)}
.sk-growth{font-size:12px;font-weight:700;color:#0a7a3d;background:#e7f7ee;border-radius:999px;
  padding:2px 10px;margin-left:10px;white-space:nowrap}
.sk-rank-table{width:100%;border-collapse:collapse;margin:8px 0 32px;font-size:15px}
.sk-rank-table th,.sk-rank-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
.sk-rank-table th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.sk-rank-pos{font-weight:800;color:var(--brand-dark);width:36px}
.sk-num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.sk-rank-table td.sk-num{text-align:right}
.muted{color:var(--muted);font-size:13px}
.sk-rel{margin:0 0 8px;padding-left:20px;display:flex;flex-direction:column;gap:6px}
.p-facts{display:flex;flex-wrap:wrap;gap:8px 18px;margin:14px 0 6px;font-size:14px;color:var(--muted)}
.p-facts a{font-weight:600}
@media (max-width:640px){
  .sk-rank-table{font-size:13px}
  .sk-rank-table th:nth-child(5),.sk-rank-table td:nth-child(5){display:none}
}

/* ---------- products: new arrivals ---------- */
.p-new{margin:0 0 30px}
.p-new-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:0 0 12px}
.p-new-head h2{margin:0;font-size:19px}
.p-new-head a{font-size:13px;font-weight:600;white-space:nowrap}
.p-new-list{display:flex;flex-direction:column;gap:14px;margin:6px 0 30px}
.p-new-row{display:grid;grid-template-columns:110px 1fr;gap:14px;align-items:start}
.p-new-date{font-size:13px;font-weight:700;color:var(--brand-dark);background:#eef0ff;border-radius:8px;
  padding:8px 10px;text-align:center;white-space:nowrap}
@media (max-width:640px){
  .p-new-row{grid-template-columns:1fr}
  .p-new-date{text-align:left;display:inline-block}
}