/* ============================================================
   BASE — Blog Article (reading page)
   New design language: Satoshi + amber, dark nav, light reading surface.
   Reuses tokens from landing.css (load landing.css BEFORE this file).
   ============================================================ */

body.article{ background:var(--bg); color:var(--ink); }

/* ---------- nav: solid from the top (no hero behind) ---------- */
body.article .nav{ position:fixed; background:rgba(255,255,255,.92); backdrop-filter:saturate(160%) blur(16px); box-shadow:0 1px 0 var(--line); }
body.article .nav .brand__logo--light{ display:none; }
body.article .nav .brand__logo--dark{ display:block; }
body.article .nav__links a{ color:var(--ink-soft); }
body.article .nav__links a:hover,
body.article .nav__links a.is-active{ color:var(--ink); }
body.article .nav__links a.is-active{ font-weight:700; }
body.article .link-quiet{ color:var(--ink-soft); }
body.article .nav__burger span{ background:var(--ink); }

/* ---------- read progress ---------- */
.read-progress{ position:fixed; top:0; left:0; height:3px; width:0%; z-index:72;
  background:linear-gradient(90deg,var(--accent-hover),var(--accent),var(--accent-2));
  box-shadow:0 0 12px rgba(236,154,40,.5); transition:width .1s linear; }

/* ---------- containers ---------- */
.container-medium{ width:100%; max-width:1140px; margin-inline:auto; padding-inline:28px; }
.container-wide{ width:100%; max-width:1200px; margin-inline:auto; padding-inline:28px; }

/* ============================================================
   POST HEADER — dark band
   ============================================================ */
.post-header-section{ position:relative; background:#100F0C; color:#fff; overflow:hidden; padding-top:96px; }
.post-cover{ position:absolute; inset:0; z-index:0; opacity:.22; }
.post-cover img{ width:100%; height:100%; object-fit:cover; filter:grayscale(.3) contrast(1.05); }
.post-header-section::after{ content:""; position:absolute; inset:0; z-index:1;
  background:linear-gradient(180deg, rgba(16,15,12,.55) 0%, rgba(16,15,12,.82) 60%, #100F0C 100%); }
.post-header-section::before{ content:""; position:absolute; z-index:1; pointer-events:none;
  left:50%; top:-30%; width:min(900px,110%); height:80%; transform:translateX(-50%);
  background:radial-gradient(closest-side, rgba(243,166,60,.16), transparent 70%); filter:blur(50px); }
.post-header-inner{ position:relative; z-index:2; padding-block:36px clamp(40px,6vw,68px); }

.post-breadcrumb{ display:flex; flex-wrap:wrap; align-items:center; gap:9px; font-size:13px; color:rgba(255,255,255,.6); margin-bottom:22px; }
.post-breadcrumb a{ color:rgba(255,255,255,.75); transition:color .15s; }
.post-breadcrumb a:hover{ color:#fff; }
.post-breadcrumb .sep{ opacity:.4; }
.post-breadcrumb [aria-current]{ color:var(--accent-2); }

.post-category-badge{ display:inline-block; font-size:11px; font-weight:700; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent-ink); background:var(--accent); padding:6px 12px; border-radius:999px; margin-bottom:20px; }

.post-header-section h1{ font-family:'Satoshi',sans-serif; font-weight:700; letter-spacing:-.025em; line-height:1.08;
  font-size:clamp(30px,4.4vw,52px); margin:0; max-width:18ch; text-wrap:balance; color:#fff; }
.post-excerpt{ margin:20px 0 0; max-width:62ch; font-size:clamp(16px,1.5vw,19px); line-height:1.55; color:rgba(255,255,255,.72); }

.post-meta{ display:flex; flex-wrap:wrap; align-items:center; gap:9px; margin-top:26px; font-size:13.5px; color:rgba(255,255,255,.6); }
.post-meta strong{ color:#fff; font-weight:700; }
.post-meta .sep{ opacity:.4; }
.post-meta time{ color:rgba(255,255,255,.7); }

/* ============================================================
   POST BODY — light reading surface, column + sticky TOC
   ============================================================ */
.post-body{ background:var(--bg); padding-block:clamp(40px,6vw,72px) clamp(64px,9vw,110px); }
.post-layout{ display:grid; grid-template-columns:minmax(0,1fr) 296px; gap:56px; align-items:start; }
.post-layout > article{ min-width:0; }

.post-content{ max-width:720px; }
.post-content > *{ margin-top:0; }
.post-content p{ font-size:18px; line-height:1.72; color:var(--ink-soft); margin:0 0 22px; max-width:68ch; }
.post-content h2{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:clamp(24px,2.6vw,32px); letter-spacing:-.02em;
  line-height:1.2; color:var(--ink); margin:52px 0 16px; scroll-margin-top:90px; text-wrap:balance; }
.post-content h3{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:clamp(19px,1.9vw,22px); letter-spacing:-.015em;
  color:var(--ink); margin:36px 0 12px; scroll-margin-top:90px; }
.post-content ul,.post-content ol{ margin:0 0 22px; padding-left:24px; max-width:68ch; }
.post-content li{ font-size:18px; line-height:1.7; color:var(--ink-soft); margin-bottom:10px; }
.post-content li::marker{ color:var(--accent-deep); }
.post-content strong{ font-weight:700; color:var(--ink); }
.post-content em{ font-style:italic; }
.post-content a{ color:var(--accent-deep); text-decoration:underline; text-underline-offset:3px; text-decoration-thickness:1.5px; text-decoration-color:rgba(154,100,16,.4); transition:text-decoration-color .15s; }
.post-content a:hover{ text-decoration-color:var(--accent-deep); }
.post-content sup a{ text-decoration:none; font-weight:700; color:var(--accent-deep); padding:0 1px; }
.post-content blockquote{ margin:28px 0; padding:6px 0 6px 22px; border-left:3px solid var(--accent); font-size:21px; line-height:1.5; font-weight:600; letter-spacing:-.01em; color:var(--ink); }
.post-content img{ border-radius:var(--r-md); margin:28px 0; box-shadow:var(--shadow-sm); }
.post-content hr,.post-content .sep{ border:none; height:1px; background:var(--line); margin:40px 0; }

/* lead / answer-first */
.post-lead,.answer-lead{ font-size:20px !important; line-height:1.55 !important; font-weight:600; color:var(--ink) !important;
  letter-spacing:-.01em; padding:18px 22px; margin:0 0 28px; border-radius:var(--r-md);
  background:linear-gradient(180deg, var(--accent-soft), #FBF3E1); border:1px solid rgba(243,166,60,.3); max-width:none; }
.post-lead strong,.answer-lead strong{ color:var(--accent-deep); }

/* TL;DR box */
.tldr-box{ background:var(--bg-soft); border:1px solid var(--line); border-radius:var(--r); padding:24px 26px; margin:0 0 32px; }
.tldr-box h3{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:13px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--accent-deep); margin:0 0 14px; }
.tldr-box ul{ margin:0; padding-left:20px; }
.tldr-box li{ font-size:15.5px; line-height:1.6; color:var(--ink-soft); margin-bottom:9px; }
.tldr-box li::marker{ color:var(--accent); }
.tldr-box strong{ color:var(--ink); }

/* ---------- TOC (sticky sidebar) ---------- */
.post-sidebar{ position:sticky; top:90px; display:flex; flex-direction:column; gap:18px; }
.toc{ background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:20px 22px; box-shadow:var(--shadow-sm); }
.toc-title{ font-size:11px; font-weight:700; letter-spacing:.16em; text-transform:uppercase; color:var(--muted); margin:0 0 12px; }
.toc ol{ list-style:none; margin:0; padding:0; counter-reset:toc; }
.toc li{ counter-increment:toc; margin:0; }
.toc a{ display:flex; gap:9px; padding:7px 0; font-size:13.5px; line-height:1.4; color:var(--ink-soft); border-bottom:1px solid var(--line-soft); transition:color .15s; }
.toc li:last-child a{ border-bottom:none; }
.toc a::before{ content:counter(toc,decimal-leading-zero); font-weight:700; font-size:11px; color:var(--accent-deep); flex:none; padding-top:2px; }
.toc a:hover{ color:var(--ink); }
.toc a.is-active{ color:var(--accent-deep); font-weight:600; }

/* sidebar cards (promo + related) */
.sidebar-card{ background:#fff; border:1px solid var(--line); border-radius:var(--r); padding:22px; box-shadow:var(--shadow-sm); }
.sidebar-card:first-of-type{ background:linear-gradient(165deg,#221F18 0%,#100F0C 100%); border-color:rgba(255,255,255,.08); color:#fff; }
.sidebar-card h4{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:17px; letter-spacing:-.01em; margin:0 0 8px; }
.sidebar-card:first-of-type h4{ color:#fff; }
.sidebar-card p{ font-size:13.5px; line-height:1.5; color:var(--muted); margin:0 0 16px; }
.sidebar-card:first-of-type p{ color:rgba(255,255,255,.62); }
.sidebar-card .btn-primary{ display:inline-flex; align-items:center; justify-content:center; width:100%; gap:8px;
  background:linear-gradient(180deg,var(--accent-2),var(--accent)); color:var(--accent-ink); font-weight:700; font-size:14px;
  padding:12px 18px; border-radius:999px; text-decoration:none; box-shadow:inset 0 1px 0 rgba(255,255,255,.45); transition:filter .2s,transform .2s; }
.sidebar-card .btn-primary:hover{ filter:brightness(1.05); transform:translateY(-1px); }
.sidebar-card h4 + p ~ .sidebar-related-post,.sidebar-related-post{ display:block; padding:11px 0; border-bottom:1px solid var(--line-soft); text-decoration:none; transition:opacity .15s; }
.sidebar-related-post:last-child{ border-bottom:none; }
.sidebar-related-post:hover{ opacity:.65; }
.sidebar-related-post span{ display:block; font-size:10.5px; font-weight:700; letter-spacing:.1em; text-transform:uppercase; color:var(--accent-deep); margin-bottom:3px; }
.sidebar-related-post strong{ display:block; font-size:14px; font-weight:600; line-height:1.3; color:var(--ink); }

/* ============================================================
   CALLOUTS
   ============================================================ */
.callout{ border-radius:var(--r-md); padding:18px 20px; margin:0 0 28px; border:1px solid var(--line); background:var(--bg-soft); }
.callout p{ margin:0; font-size:15.5px; line-height:1.6; color:var(--ink-soft); max-width:none; }
.callout strong{ color:var(--ink); }
.callout-data{ background:#EEF1FB; border-color:#D5DDF4; }
.callout-original{ background:var(--accent-soft); border-color:rgba(243,166,60,.35); }
.callout-tip{ background:#E9F6EC; border-color:#CDE9D3; }
.callout-warning{ background:#15140F; border-color:#15140F; }
.callout-warning p{ color:rgba(255,255,255,.88); }
.callout-warning strong{ color:#fff; }

/* ============================================================
   STAT BLOCK
   ============================================================ */
.post-stat-block{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:14px; margin:0 0 30px; }
.post-stat{ background:#fff; border:1px solid var(--line); border-radius:var(--r-md); padding:18px; }
.post-stat-number{ display:block; font-family:'Satoshi',sans-serif; font-weight:800; font-size:clamp(22px,2.4vw,28px); letter-spacing:-.02em; color:var(--ink); line-height:1; }
.post-stat-label{ display:block; margin-top:8px; font-size:12.5px; line-height:1.4; color:var(--muted); }

/* ============================================================
   MATH BLOCK
   ============================================================ */
.math-block{ background:#15140F; color:#fff; border-radius:var(--r); padding:22px 24px; margin:0 0 30px; }
.math-block-title{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:13px; letter-spacing:.1em; text-transform:uppercase; color:var(--accent-2); margin:0 0 14px; }
.math-row{ display:flex; justify-content:space-between; align-items:baseline; gap:16px; padding:10px 0; border-top:1px solid rgba(255,255,255,.08); }
.math-row:first-of-type{ border-top:none; }
.math-row-label{ font-size:14px; color:rgba(255,255,255,.66); }
.math-row-value{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:16px; color:#fff; white-space:nowrap; }
.math-row-value.positive,.positive{ color:#34d27b; }
.math-row-value.negative,.negative{ color:#ff7a7a; }
.math-total{ display:flex; justify-content:space-between; align-items:baseline; gap:16px; margin-top:8px; padding-top:14px; border-top:2px solid rgba(255,255,255,.18); font-family:'Satoshi',sans-serif; font-weight:800; font-size:18px; }

/* ============================================================
   TIMELINE (retenção)
   ============================================================ */
.timeline{ margin:0 0 30px; padding-left:26px; border-left:2px solid var(--line); }
.timeline-item{ position:relative; padding:0 0 22px 18px; }
.timeline-item:last-child{ padding-bottom:0; }
.timeline-dot{ position:absolute; left:-35px; top:2px; width:14px; height:14px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 4px var(--bg); }
.timeline-label{ display:block; font-size:12px; font-weight:700; letter-spacing:.08em; text-transform:uppercase; color:var(--accent-deep); margin-bottom:4px; }

/* ============================================================
   TABLES (comparison / operator)
   ============================================================ */
.comparison-table,.operator-table{ width:100%; border-collapse:collapse; margin:0 0 30px; font-size:15px; border:1px solid var(--line); border-radius:var(--r-md); overflow:hidden; }
.comparison-table th,.operator-table th{ background:#15140F; color:#fff; font-family:'Satoshi',sans-serif; font-weight:700; font-size:13px; text-align:left; padding:13px 16px; }
.comparison-table td,.operator-table td{ padding:13px 16px; border-top:1px solid var(--line); color:var(--ink-soft); vertical-align:top; }
.comparison-table tr:nth-child(even) td,.operator-table tr:nth-child(even) td{ background:var(--bg-soft); }
.comparison-table strong,.operator-table strong{ color:var(--ink); }

/* ============================================================
   CHECKLIST (sistema)
   ============================================================ */
.checklist-block{ background:var(--bg-soft); border:1px solid var(--line); border-radius:var(--r); padding:22px 26px; margin:0 0 30px; }
.checklist-block ul{ list-style:none; margin:0; padding:0; }
.checklist-block li{ position:relative; padding:8px 0 8px 32px; font-size:16px; line-height:1.55; color:var(--ink-soft); }
.checklist-block li::before{ content:""; position:absolute; left:0; top:11px; width:18px; height:18px; border-radius:50%; background:var(--accent); }
.checklist-block li::after{ content:""; position:absolute; left:6px; top:14px; width:5px; height:9px; border:solid var(--accent-ink); border-width:0 2px 2px 0; transform:rotate(45deg); }

/* ============================================================
   FAQ (visible)
   ============================================================ */
#faq{ scroll-margin-top:90px; }
.faq-list{ display:flex; flex-direction:column; }
.faq-item{ border-top:1px solid var(--line); padding:6px 0; }
.faq-item:last-child{ border-bottom:1px solid var(--line); }
.post-content #faq ~ h3,.faq-item h3,.faq-item summary{ font-size:18px; }

/* ============================================================
   SOURCES
   ============================================================ */
.sources-section{ margin:48px 0 0; padding:24px 0 0; border-top:1px solid var(--line); }
.sources-section h3{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:14px; letter-spacing:.1em; text-transform:uppercase; color:var(--muted); margin:0 0 14px; }
.sources-list{ margin:0; padding-left:20px; }
.sources-list li{ font-size:13.5px; line-height:1.5; color:var(--muted); margin-bottom:9px; }
.sources-list a{ color:var(--accent-deep); }
.sources-note{ font-size:12.5px; color:var(--muted); margin-top:14px; font-style:italic; }

/* ============================================================
   INLINE CTA
   ============================================================ */
.post-cta-inline{ background:linear-gradient(165deg,#221F18 0%,#100F0C 100%); color:#fff; border-radius:var(--r); padding:clamp(28px,4vw,40px); margin:34px 0; text-align:center; border:1px solid rgba(255,255,255,.08); position:relative; overflow:hidden; }
.post-cta-inline::before{ content:""; position:absolute; left:50%; top:-40%; width:70%; height:90%; transform:translateX(-50%);
  background:radial-gradient(closest-side, rgba(243,166,60,.18), transparent 70%); filter:blur(40px); pointer-events:none; }
.post-cta-inline > *{ position:relative; z-index:1; }
.post-cta-inline h3,.post-cta-inline h2{ font-family:'Satoshi',sans-serif; font-weight:700; font-size:clamp(20px,2.4vw,26px); letter-spacing:-.02em; color:#fff; margin:0 0 10px; }
.post-cta-inline p{ font-size:15px; line-height:1.55; color:rgba(255,255,255,.66); margin:0 auto 20px; max-width:46ch; }
.post-cta-inline .btn-primary{ display:inline-flex; align-items:center; gap:9px; background:linear-gradient(180deg,var(--accent-2),var(--accent)); color:var(--accent-ink); font-weight:700; font-size:15px; padding:14px 28px; border-radius:999px; text-decoration:none; box-shadow:inset 0 1px 0 rgba(255,255,255,.45); transition:filter .2s,transform .2s; }
.post-cta-inline .btn-primary:hover{ filter:brightness(1.05); transform:translateY(-1px); }

/* ============================================================
   FOOTER NAV (prev/next + back) + AUTHOR CARD
   ============================================================ */
.post-footer-nav{ display:flex; flex-wrap:wrap; gap:14px; justify-content:space-between; align-items:center; margin-top:44px; padding-top:26px; border-top:1px solid var(--line); }
.post-back{ display:inline-flex; align-items:center; gap:8px; font-weight:600; font-size:15px; color:var(--ink-soft); text-decoration:none; transition:color .15s; }
.post-back:hover{ color:var(--accent-deep); }

.author-card{ display:flex; align-items:center; gap:16px; margin:40px 0 0; padding:22px; background:var(--bg-soft); border:1px solid var(--line); border-radius:var(--r); }
.author-avatar{ width:54px; height:54px; border-radius:50%; flex:none; display:grid; place-items:center; background:linear-gradient(180deg,var(--accent-2),var(--accent)); color:var(--accent-ink); font-family:'Satoshi',sans-serif; font-weight:800; font-size:20px; overflow:hidden; }
.author-avatar img{ width:100%; height:100%; object-fit:cover; }
.author-info strong{ display:block; font-size:15px; font-weight:700; color:var(--ink); }
.author-info span,.author-info p{ font-size:13.5px; color:var(--muted); margin:2px 0 0; line-height:1.5; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1024px){
  .post-layout{ grid-template-columns:1fr; gap:36px; }
  .post-sidebar{ position:static; flex-direction:row; flex-wrap:wrap; }
  .toc{ flex:1 1 100%; order:-1; }
  .sidebar-card{ flex:1 1 260px; }
  .post-content{ max-width:none; }
}
@media (max-width:680px){
  .container-medium,.container-wide{ padding-inline:20px; }
  .post-content p,.post-content li{ font-size:17px; }
  .post-sidebar{ flex-direction:column; }
  .post-footer-nav{ flex-direction:column; align-items:stretch; }
}

@media (prefers-reduced-motion:reduce){
  .read-progress{ display:none; }
}