/* ============================================================
   Blog redesign — modern visual layer (2026-10-31)
   Loaded after tailwind.css; all redesign classes are s4p-*
   ============================================================ */
:root{
  --ink:#0f172a; --ink-2:#1e293b; --muted:#64748b; --muted-2:#94a3b8;
  --line:#e6ebf2; --bg:#f6f8fb; --card:#ffffff;
  --brand:#0b5ed7; --brand-2:#0ea5e9; --brand-ink:#0a4db3;
  --grad:linear-gradient(120deg,#0b5ed7 0%,#0ea5e9 60%,#22c1dc 100%);
  --grad-dark:linear-gradient(135deg,#0b1e42 0%,#0b3b8f 55%,#0b5ed7 100%);
  --radius:18px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.05),0 4px 14px rgba(15,23,42,.05);
  --shadow-md:0 6px 24px rgba(11,94,215,.12),0 2px 6px rgba(15,23,42,.06);
  --shadow-lg:0 18px 44px rgba(11,46,110,.20);
}
html{scroll-behavior:smooth}
body{font-family:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink-2);-webkit-font-smoothing:antialiased}
::selection{background:#bfdbfe}

/* ---------- header ---------- */
.s4p-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.s4p-header-in{max-width:76rem;margin:0 auto;padding:.8rem 1rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.s4p-brand{display:flex;align-items:center;gap:.65rem;text-decoration:none}
.s4p-brand-mark{width:40px;height:40px;border-radius:12px;background:var(--grad);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:1.05rem;letter-spacing:-.03em;box-shadow:var(--shadow-md)}
.s4p-brand-name{font-size:1.3rem;font-weight:800;letter-spacing:-.03em;color:var(--ink);line-height:1}
.s4p-brand-name em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.s4p-brand-sub{display:block;font-size:.62rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2);margin-top:.2rem}
.s4p-nav{display:flex;align-items:center;gap:.4rem}
.s4p-nav a.s4p-nav-link{padding:.5rem .9rem;border-radius:999px;font-size:.9rem;font-weight:600;color:var(--ink-2);text-decoration:none;transition:.2s}
.s4p-nav a.s4p-nav-link:hover{background:#eef4fd;color:var(--brand-ink)}
.s4p-nav a.s4p-nav-cta{background:var(--ink);color:#fff;padding:.55rem 1.05rem;border-radius:999px;font-size:.9rem;font-weight:600;text-decoration:none;transition:.2s}
.s4p-nav a.s4p-nav-cta:hover{background:var(--brand-ink)}

/* ---------- footer ---------- */
.s4p-footer{margin-top:5rem;background:#0b1e42;color:#cbd5e1}
.s4p-footer-in{max-width:76rem;margin:0 auto;padding:3rem 1rem 2rem;display:grid;gap:2rem;grid-template-columns:1fr}
@media(min-width:768px){.s4p-footer-in{grid-template-columns:1.4fr 1fr 1fr}}
.s4p-footer h4{color:#fff;font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;margin:0 0 .9rem}
.s4p-footer a{color:#cbd5e1;text-decoration:none;font-size:.92rem}
.s4p-footer a:hover{color:#7dd3fc}
.s4p-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.s4p-footer-brand{display:flex;align-items:center;gap:.65rem;margin-bottom:.8rem}
.s4p-footer p{font-size:.92rem;line-height:1.65;color:#94a3b8;max-width:34rem;margin:0}
.s4p-footer-bar{border-top:1px solid rgba(148,163,184,.22);padding:1.1rem 1rem;text-align:center;font-size:.83rem;color:#7c8db0;max-width:76rem;margin:0 auto}

/* ---------- listing hero ---------- */
.s4p-hero{background:var(--grad-dark);color:#fff;position:relative;overflow:hidden}
.s4p-hero::after{content:"";position:absolute;inset:0;background:radial-gradient(600px 240px at 85% -40px,rgba(56,189,248,.35),transparent 60%),radial-gradient(500px 220px at 8% 120%,rgba(34,193,220,.22),transparent 60%);pointer-events:none}
.s4p-hero-in{max-width:76rem;margin:0 auto;padding:2.6rem 1rem 3rem;position:relative;z-index:1}
.s4p-crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:.35rem;font-size:.78rem;font-weight:500;color:#a9c3ee;margin-bottom:1.4rem}
.s4p-crumbs a{color:#a9c3ee;text-decoration:none;display:inline-flex;align-items:center;gap:.35rem}
.s4p-crumbs a:hover{color:#fff}
.s4p-crumbs .sep{opacity:.55}
.s4p-crumbs .cur{color:#fff;font-weight:600}
.s4p-eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-size:.78rem;font-weight:700;letter-spacing:.13em;text-transform:uppercase;color:#7dd3fc;margin-bottom:.9rem}
.s4p-eyebrow::before{content:"";width:26px;height:2px;background:#38bdf8;border-radius:2px}
.s4p-hero h1{font-size:clamp(1.65rem,3.6vw,2.6rem);line-height:1.15;font-weight:800;letter-spacing:-.025em;margin:0;max-width:52rem;color:#fff}
.s4p-search{margin-top:1.6rem;max-width:34rem;position:relative}
.s4p-search input{width:100%;border:0;border-radius:14px;padding:.95rem 1.1rem .95rem 2.9rem;font-size:.95rem;color:var(--ink);background:#fff;box-shadow:var(--shadow-lg);outline:none}
.s4p-search input:focus{box-shadow:0 0 0 4px rgba(56,189,248,.45),var(--shadow-lg)}
.s4p-search svg{position:absolute;left:1rem;top:50%;transform:translateY(-50%);color:#94a3b8}

/* ---------- vendor chips ---------- */
.s4p-vendors{max-width:76rem;margin:0 auto;padding:1.6rem 1rem 0}
.s4p-vendors-label{font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 .7rem}
.s4p-chips{display:flex;flex-wrap:wrap;gap:.5rem}
.s4p-chip{display:inline-block;padding:.48rem .95rem;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.8rem;font-weight:600;color:var(--ink-2);text-decoration:none;transition:.18s;box-shadow:var(--shadow-sm)}
.s4p-chip:hover{border-color:#bcd6fb;color:var(--brand-ink);transform:translateY(-1px)}
.s4p-chip.on{background:var(--grad);border-color:transparent;color:#fff}

/* ---------- cards ---------- */
.s4p-grid{max-width:76rem;margin:0 auto;padding:1.8rem 1rem 0;display:grid;gap:1.4rem;grid-template-columns:1fr}
@media(min-width:768px){.s4p-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.s4p-grid{grid-template-columns:repeat(3,1fr)}}
.s4p-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-sm);transition:transform .25s ease,box-shadow .25s ease}
.s4p-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.s4p-card-fig{position:relative;height:200px;overflow:hidden;background:#dbe7f7}
.s4p-card-fig img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.s4p-card:hover .s4p-card-fig img{transform:scale(1.05)}
.s4p-card-badge{position:absolute;top:.8rem;right:.8rem;background:rgba(11,30,66,.88);color:#fff;font-size:.68rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:.35rem .65rem;border-radius:999px;backdrop-filter:blur(4px)}
.s4p-card-body{padding:1.25rem 1.3rem 1.35rem;display:flex;flex-direction:column;gap:.6rem;flex:1}
.s4p-card-tags{display:flex;justify-content:space-between;align-items:center;gap:.5rem}
.s4p-tag{font-size:.68rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--brand-ink);background:#e8f1fd;padding:.32rem .6rem;border-radius:999px}
.s4p-vendor-link{font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--brand);text-decoration:none}
.s4p-vendor-link:hover{text-decoration:underline}
.s4p-card h2{font-size:1.16rem;line-height:1.35;font-weight:700;letter-spacing:-.015em;margin:0}
.s4p-card h2 a{color:var(--ink);text-decoration:none}
.s4p-card h2 a:hover{color:var(--brand-ink)}
.s4p-card-excerpt{font-size:.92rem;line-height:1.65;color:var(--muted);margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.s4p-card-meta{margin-top:auto;padding-top:.8rem;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:.8rem;color:var(--muted)}
.s4p-readmore{font-weight:700;color:var(--brand);text-decoration:none;font-size:.83rem;display:inline-flex;align-items:center;gap:.3rem}
.s4p-readmore:hover{color:var(--brand-ink);gap:.5rem}
.s4p-empty{max-width:76rem;margin:2rem auto;padding:2.5rem 1rem;background:#fff;border:1px dashed #cbd5e1;border-radius:var(--radius);text-align:center;color:var(--muted)}

/* ---------- pagination ---------- */
.s4p-pager{max-width:76rem;margin:2.6rem auto 0;padding:0 1rem;display:flex;justify-content:center}
.s4p-pager nav{display:flex;flex-wrap:wrap;gap:.45rem;justify-content:center}
.s4p-pg{min-width:2.6rem;height:2.6rem;padding:0 .6rem;display:inline-flex;align-items:center;justify-content:center;border-radius:12px;background:#fff;border:1px solid var(--line);font-weight:600;font-size:.9rem;color:var(--brand-ink);text-decoration:none;transition:.18s}
.s4p-pg:hover{border-color:#bcd6fb;transform:translateY(-1px)}
.s4p-pg.on{background:var(--grad);color:#fff;border-color:transparent}
.s4p-pg.off{opacity:.4;pointer-events:none}
.s4p-pg.dots{background:transparent;border-color:transparent;color:var(--muted-2)}

/* ---------- article page ---------- */
.s4p-article-head{max-width:76rem;margin:0 auto;padding:2.2rem 1rem 0}
.s4p-article-head .s4p-crumbs{color:var(--muted)}
.s4p-article-head .s4p-crumbs a{color:var(--muted)}
.s4p-article-head .s4p-crumbs a:hover{color:var(--brand-ink)}
.s4p-article-head .s4p-crumbs .cur{color:var(--ink-2)}
.s4p-article{max-width:76rem;margin:0 auto;padding:0 1rem}
.s4p-title{font-size:clamp(1.8rem,4vw,2.7rem);line-height:1.14;font-weight:800;letter-spacing:-.028em;color:var(--ink);margin:.9rem 0 1.1rem;max-width:56rem}
.s4p-byline{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem;font-size:.88rem;color:var(--muted);margin-bottom:1.6rem}
.s4p-avatar{width:38px;height:38px;border-radius:50%;background:var(--grad);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:.8rem;flex:none}
.s4p-byline strong{color:var(--ink)}
.s4p-byline .dot{color:#cbd5e1}
.s4p-heroimg{border-radius:22px;overflow:hidden;box-shadow:var(--shadow-md);margin-bottom:2rem;background:#dbe7f7}
.s4p-heroimg img{width:100%;height:auto;display:block}
.s4p-lead{font-size:1.13rem;line-height:1.75;color:#475569;border-left:4px solid var(--brand-2);background:#eef6ff;border-radius:0 14px 14px 0;padding:1.1rem 1.3rem;margin:0 0 2rem}
.s4p-lead p{margin:0}

/* article body typography (replaces legacy .blog-content palette) */
.blog-content{font-family:"Inter",sans-serif;font-size:1.06rem;line-height:1.8;color:#334155}
.blog-content p{margin:1.05rem 0;font-size:1.06rem;line-height:1.8;color:#334155}
.blog-content h1,.blog-content h2,.blog-content h3{font-weight:750;letter-spacing:-.02em;color:var(--ink);margin:2.1rem 0 .8rem;line-height:1.25}
.blog-content h1{font-size:1.8rem}
.blog-content h2{font-size:1.5rem;padding-bottom:.45rem;border-bottom:2px solid #e8f1fd}
.blog-content h3{font-size:1.22rem;color:#0a4db3}
.blog-content h4{font-size:1.08rem;font-weight:700;color:var(--ink);margin:1.6rem 0 .6rem}
.blog-content ul,.blog-content ol{margin:1rem 0 1.4rem;padding-left:1.4rem;color:#334155}
.blog-content ul{list-style:disc}.blog-content ol{list-style:decimal}
.blog-content li{margin-bottom:.5rem;line-height:1.75}
.blog-content a{color:var(--brand);font-weight:600;text-decoration:underline;text-underline-offset:3px}
.blog-content a:hover{color:var(--brand-ink)}
.blog-content strong{color:var(--ink-2)}
.blog-content blockquote{margin:1.6rem 0;padding:1.1rem 1.4rem;border-left:4px solid var(--brand-2);background:#f1f7ff;border-radius:0 14px 14px 0;font-size:1.05rem;color:#334155;font-style:italic}
.blog-content pre{background:#0f172a;color:#e2e8f0;padding:1.1rem 1.2rem;margin:1.6rem 0;border-radius:14px;font-size:.92rem;line-height:1.65;overflow-x:auto}
.blog-content code{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace}
.blog-content img{max-width:100%;height:auto;margin:1.6rem auto;display:block;border-radius:14px}
.blog-content table{width:100%;border-collapse:collapse;margin:1.6rem 0;font-size:.98rem;line-height:1.6}
.blog-content .table-wrapper{width:100%;overflow-x:auto;margin:1.4rem 0;border:1px solid var(--line);border-radius:14px}
.blog-content table th,.blog-content table td{border:1px solid var(--line);padding:.7rem .95rem;text-align:left}
.blog-content table th{background:#eef4fd;font-weight:700;color:var(--ink)}
.blog-content table tr:nth-child(even){background:#f8fafc}
.blog-content .border-b{border-bottom:1px solid var(--line);margin-bottom:1.5rem;padding-bottom:1.5rem}
.blog-content b.voucher{display:inline-block;background:#6d28d9;color:#fff;font-weight:800;text-transform:uppercase;padding:.5em 1.25em;font-size:.9em;position:relative;clip-path:polygon(10% 0%,90% 0%,100% 25%,100% 75%,90% 100%,10% 100%,0% 75%,0% 25%)}
.blog-content b.voucher::before{content:"";position:absolute;inset:4px;border:2px dashed rgba(255,255,255,.8);clip-path:inherit}

/* author box */
.s4p-author{margin-top:2.8rem;display:flex;gap:1.1rem;background:linear-gradient(120deg,#eef6ff,#f5f9ff);border:1px solid #d8e8fc;border-radius:20px;padding:1.4rem 1.5rem}
.s4p-author .s4p-avatar{width:52px;height:52px;font-size:1rem}
.s4p-author .k{font-size:.68rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);margin:0}
.s4p-author .n{font-size:1.05rem;font-weight:750;color:var(--ink);margin:.15rem 0 .35rem}
.s4p-author .b{font-size:.92rem;line-height:1.65;color:#475569;margin:0}

/* sidebar */
.s4p-side-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.25rem 1.3rem;box-shadow:var(--shadow-sm)}
.s4p-side-card h2{font-size:.8rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);margin:0 0 1rem;display:flex;align-items:center;gap:.5rem}
.s4p-side-card h2::before{content:"";width:8px;height:8px;border-radius:3px;background:var(--grad)}
.s4p-side-card h2 .by{color:var(--muted);font-weight:600;letter-spacing:.02em;text-transform:none;font-size:.8rem}
.s4p-exam{display:block;text-decoration:none;padding:.55rem .6rem;margin:0 -.6rem;border-radius:10px;transition:.15s}
.s4p-exam:hover{background:#f2f7fe}
.s4p-exam .c{display:block;font-size:.86rem;font-weight:700;color:var(--brand-ink)}
.s4p-exam .t{display:block;font-size:.88rem;color:var(--ink-2);line-height:1.45}
.s4p-exam .q{display:block;font-size:.76rem;color:var(--muted);margin-top:.15rem}
.s4p-rel{display:block;text-decoration:none;padding:.5rem .6rem;margin:0 -.6rem;border-radius:10px;transition:.15s}
.s4p-rel:hover{background:#f2f7fe}
.s4p-rel .t{display:block;font-size:.9rem;font-weight:600;color:var(--ink-2);line-height:1.45}
.s4p-rel:hover .t{color:var(--brand-ink)}
.s4p-rel .d{display:block;font-size:.76rem;color:var(--muted);margin-top:.15rem}
.s4p-side-list{list-style:none;margin:0;padding:0;display:grid;gap:.35rem}

/* banner slot */
.s4p-banner{max-width:76rem;margin:1.2rem auto 0;padding:0 1rem;text-align:center}
.s4p-banner img{max-width:100%;border-radius:14px}

/* ---------- article layout (carried from legacy inline styles) ---------- */
.blog-layout{display:flex;flex-wrap:wrap;align-items:flex-start;width:100%;gap:2.2rem}
.blog-main{flex:1 1 0;min-width:0;width:100%}
.blog-side{flex:1 1 100%;width:100%;min-width:0}
.blog-side-inner{display:flex;flex-direction:column;gap:1.25rem}
@media(min-width:1024px){
  .blog-side{flex:0 0 340px;width:340px;max-width:340px;position:sticky;top:6rem}
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ============================================================
   Redesign v2 — contemporary layer (2026-10-31, user feedback:
   v1 "still old fashioned"). Display type, floating glass
   header, mesh hero, featured story, progress bar, TOC.
   ============================================================ */
:root{
  --font-display:"Sora","Inter",system-ui,sans-serif;
  --grad:linear-gradient(120deg,#2563eb 0%,#7c3aed 55%,#db2777 130%);
  --grad-dark:linear-gradient(130deg,#070d24 0%,#0b2563 52%,#123a8f 78%,#3b1470 125%);
  --brand:#2563eb; --brand-2:#7c3aed; --brand-ink:#1d4ed8;
  --shadow-md:0 10px 34px rgba(37,60,180,.14),0 2px 8px rgba(15,23,42,.06);
  --shadow-lg:0 24px 54px rgba(10,22,80,.28);
  --radius:22px;
}
h1,h2,.s4p-brand-name{font-family:var(--font-display)}

/* floating glass header */
.s4p-header{position:sticky;top:.7rem;z-index:50;background:transparent;border-bottom:0;backdrop-filter:none;margin:0 auto;max-width:78rem;padding:0 .8rem}
.s4p-header-in{background:rgba(255,255,255,.82);backdrop-filter:blur(16px);border:1px solid rgba(230,235,242,.9);border-radius:18px;box-shadow:0 10px 30px rgba(15,23,42,.08);padding:.6rem .8rem .6rem 1rem}
.s4p-brand-mark{border-radius:13px;background:var(--grad)}
.s4p-brand-name em{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.s4p-nav a.s4p-nav-cta{background:var(--ink)}
.s4p-nav a.s4p-nav-cta:hover{background:linear-gradient(120deg,#2563eb,#7c3aed)}

/* hero: mesh gradient + grid overlay + display type */
.s4p-hero{margin-top:1rem;background:var(--grad-dark);border-radius:0}
.s4p-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(148,184,255,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(148,184,255,.10) 1px,transparent 1px);background-size:44px 44px;mask-image:radial-gradient(75% 90% at 50% 0%,#000 30%,transparent 100%);pointer-events:none}
.s4p-hero::after{background:radial-gradient(640px 260px at 88% -30px,rgba(124,58,237,.45),transparent 62%),radial-gradient(560px 260px at 4% 115%,rgba(14,165,233,.32),transparent 60%),radial-gradient(300px 160px at 55% 120%,rgba(219,39,119,.18),transparent 65%)}
.s4p-hero-in{padding:3rem 1rem 3.4rem}
.s4p-eyebrow{color:#a5b4fc}
.s4p-eyebrow::before{background:linear-gradient(90deg,#38bdf8,#a78bfa)}
.s4p-hero h1{font-family:var(--font-display);font-weight:800;font-size:clamp(2rem,4.6vw,3.15rem);letter-spacing:-.03em;line-height:1.08;max-width:46rem}
.s4p-hero-stats{display:flex;flex-wrap:wrap;gap:2.2rem;margin-top:2rem}
.s4p-stat .n{font-family:var(--font-display);font-size:1.45rem;font-weight:800;color:#fff;line-height:1}
.s4p-stat .l{font-size:.74rem;font-weight:600;letter-spacing:.11em;text-transform:uppercase;color:#93a7d8;margin-top:.35rem}
.s4p-search input{border-radius:16px}
.s4p-search input:focus{box-shadow:0 0 0 4px rgba(167,139,250,.5),var(--shadow-lg)}
.s4p-crumbs{font-size:.8rem}

/* featured first story */
.s4p-featured{max-width:76rem;margin:2rem auto 0;padding:0 1rem}
.s4p-featured-card{display:grid;grid-template-columns:1fr;background:#fff;border:1px solid var(--line);border-radius:26px;overflow:hidden;box-shadow:var(--shadow-md);text-decoration:none;transition:transform .25s ease,box-shadow .25s ease}
.s4p-featured-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
@media(min-width:900px){.s4p-featured-card{grid-template-columns:1.15fr 1fr}}
.s4p-featured-fig{position:relative;min-height:260px;background:#dbe7f7}
.s4p-featured-fig img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.s4p-featured-body{padding:2rem 2.1rem;display:flex;flex-direction:column;gap:.8rem;justify-content:center}
.s4p-featured-flag{align-self:flex-start;font-size:.68rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#fff;background:var(--grad);padding:.4rem .75rem;border-radius:999px}
.s4p-featured-body h2{font-size:clamp(1.45rem,2.6vw,1.9rem);line-height:1.22;font-weight:800;letter-spacing:-.02em;margin:0;color:var(--ink)}
.s4p-featured-body p{font-size:1rem;line-height:1.7;color:var(--muted);margin:0;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.s4p-featured-meta{display:flex;align-items:center;gap:.6rem;font-size:.83rem;color:var(--muted);margin-top:.4rem}

/* cards v2 */
.s4p-card{border-radius:22px;border:1px solid rgba(230,235,242,.7)}
.s4p-card:hover{box-shadow:0 22px 44px rgba(37,60,180,.16)}
.s4p-card-fig{height:190px}
.s4p-card h2{font-family:var(--font-display);font-weight:700}
.s4p-chip.on{background:var(--grad)}
.s4p-pg.on{background:var(--grad)}
.s4p-tag{background:#eef2ff;color:#4338ca}
.s4p-avatar{background:var(--grad)}

/* article v2 */
.s4p-progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--grad);z-index:60;border-radius:0 3px 3px 0}
.s4p-title{font-family:var(--font-display);font-weight:800}
.s4p-lead{border-left:0;background:linear-gradient(120deg,#eef4ff,#f5f0ff);border:1px solid #dde7fb;border-radius:16px}
.s4p-toc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:1.15rem 1.3rem;margin:0 0 2rem;box-shadow:var(--shadow-sm)}
.s4p-toc .t{font-family:var(--font-display);font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);margin:0 0 .6rem}
.s4p-toc ul{list-style:none;margin:0;padding:0;display:grid;gap:.35rem}
.s4p-toc a{color:#475569;text-decoration:none;font-size:.94rem;font-weight:550;display:flex;gap:.55rem;align-items:baseline}
.s4p-toc a::before{content:"";width:6px;height:6px;border-radius:2px;background:linear-gradient(120deg,#2563eb,#7c3aed);flex:none;transform:translateY(-2px)}
.s4p-toc a:hover{color:var(--brand-ink)}
.blog-content h2{border-bottom:0;position:relative;padding-left:1rem}
.blog-content h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:4px;border-radius:4px;background:linear-gradient(180deg,#2563eb,#7c3aed)}
.blog-content h3{color:#6d28d9}
.s4p-author{background:linear-gradient(120deg,#eef4ff,#f7f0ff);border-color:#ddd0fa}
.s4p-heroimg{border-radius:26px}
.s4p-footer{background:#070d24}
.s4p-footer-bar{color:#64748b}

/* ---- redesign v3: hot-exams sidebar (user request 2026-10-31) ---- */
.s4p-layout{display:flex;gap:2rem;align-items:flex-start}
.s4p-main{flex:1;min-width:0}
.s4p-layout .s4p-grid{grid-template-columns:repeat(2,1fr)}
.s4p-aside{width:300px;flex:none;position:sticky;top:6.5rem}
@media(max-width:1100px){
  .s4p-aside{width:248px}
  .s4p-layout .s4p-grid{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
}
@media(max-width:720px){
  .s4p-layout{flex-direction:column}
  .s4p-layout .s4p-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
  .s4p-aside{width:100%;position:static}
}
.s4p-hot h3,.s4p-hot h2{display:flex;align-items:center;gap:.55rem}
.s4p-hot-dot{width:9px;height:9px;border-radius:50%;background:linear-gradient(120deg,#f97316,#db2777);box-shadow:0 0 0 4px rgba(219,39,119,.14);flex:none}
.s4p-hot ul{list-style:none;margin:0;padding:0;display:grid}
.s4p-hot li{border-top:1px solid var(--line)}
.s4p-hot li:first-child{border-top:0}
.s4p-hot a{display:flex;align-items:center;gap:.7rem;padding:.68rem .3rem;text-decoration:none;border-radius:10px;transition:background .15s ease}
.s4p-hot a:hover{background:#f4f7ff}
.s4p-hot-rank{font-family:var(--font-display);font-weight:800;font-size:.85rem;width:22px;height:22px;border-radius:7px;background:#eef2ff;color:#4338ca;display:flex;align-items:center;justify-content:center;flex:none}
.s4p-hot li:nth-child(-n+3) .s4p-hot-rank{background:linear-gradient(120deg,#2563eb,#7c3aed);color:#fff}
.s4p-hot-name{flex:1;font-weight:600;color:var(--ink);font-size:.93rem;line-height:1.3}
.s4p-hot-code{font-size:.72rem;font-weight:700;letter-spacing:.04em;color:#7c3aed;background:#f5f0ff;padding:.22rem .5rem;border-radius:999px;flex:none}
.s4p-hot-note{font-size:.8rem;color:var(--muted);margin:.9rem 0 0;line-height:1.55}
.s4p-hot h2::before{display:none}

/* ---- redesign v4: travelling sidebar (scroll-tracked, user spec 2026-10-31) ---- */
.s4p-layout{align-items:stretch}
.s4p-aside{position:relative;top:auto}
.blog-layout{align-items:stretch}
@media(min-width:1024px){
  .blog-side{position:relative;top:auto}
}
.s4p-mover{position:relative;will-change:transform}
.s4p-mover.s4p-stick{position:sticky;top:104px;transform:none!important}

/* ---- redesign v5: bigger author card, follow row, share bar ---- */
.s4p-author{padding:2rem 2.1rem;gap:1.5rem;border-radius:24px}
.s4p-author .s4p-avatar{width:88px;height:88px;font-size:2rem;border-radius:24px}
.s4p-author .k{font-size:.72rem}
.s4p-author .n{font-family:var(--font-display);font-size:1.5rem;font-weight:800;letter-spacing:-.01em}
.s4p-author .r{font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;margin:.15rem 0 0}
.s4p-author .b{font-size:1rem;line-height:1.75;max-width:58ch}
@media(max-width:640px){.s4p-author{flex-direction:column;padding:1.6rem 1.4rem}}
.s4p-social{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.15rem}
.s4p-soc,.s4p-shr{display:inline-flex;align-items:center;gap:.45rem;padding:.52rem .85rem;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink);font-size:.83rem;font-weight:650;text-decoration:none;cursor:pointer;font-family:inherit;transition:all .18s ease}
.s4p-soc:hover,.s4p-shr:hover{color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-md)}
.s4p-soc svg,.s4p-shr svg{flex:none}
.soc-x:hover,.shr-x:hover{background:#000;border-color:#000}
.soc-th:hover{background:#000;border-color:#000}
.soc-yt:hover,.shr-fb:hover{background:#ff0000;border-color:#ff0000}
.shr-fb:hover{background:#1877f2;border-color:#1877f2}
.soc-tt:hover{background:#000;border-color:#000}
.soc-qr:hover{background:#b92b27;border-color:#b92b27}
.soc-rd:hover{background:#ff4500;border-color:#ff4500}
.soc-pin:hover{background:#e60023;border-color:#e60023}
.shr-in:hover{background:#0a66c2;border-color:#0a66c2}
.shr-wa:hover{background:#25d366;border-color:#25d366}
.shr-copy:hover{background:var(--brand);border-color:var(--brand)}
.s4p-share{display:flex;flex-wrap:wrap;align-items:center;gap:.55rem;margin-top:2.4rem;background:#fff;border:1px solid var(--line);border-radius:18px;padding:1rem 1.15rem;box-shadow:var(--shadow-sm)}
.s4p-share-label{font-family:var(--font-display);font-size:.78rem;font-weight:800;letter-spacing:.11em;text-transform:uppercase;color:var(--muted);margin-right:.3rem}

/* ---------- phase 5: vendor hub + nav/footer ---------- */
.s4p-hub{max-width:76rem;margin:2rem auto 0;padding:0 1rem}
.s4p-hub-intro{font-size:1.02rem;line-height:1.7;color:var(--ink-2);max-width:52rem;margin:0}
.s4p-hub-exams{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:1rem}
.s4p-hub-exams-label{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted-2);margin-right:.25rem}
@media(min-width:768px){.s4p-footer-in{grid-template-columns:1.35fr 1fr 1fr 1fr}}
@media(max-width:900px){.s4p-nav a.s4p-nav-link.opt{display:none}}

/* header logo (2026-11-02) */
.s4p-brand-logo{height:38px;width:auto;display:block}