/* ============================================================
   NewLearn.in — Blog Article Stylesheet (shared)
   Brand tokens pulled from main1.css so every article matches
   the live site exactly. No header/footer here by design —
   articles are meant to sit inside the existing site chrome
   or stand alone with the minimal strip below.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --nl-header-h: 72px; /* matches --hnl-header-h on the site's fixed header — used to offset content below it */
  --nl-ink: #09090F;
  --nl-ink-soft: #23263A;
  --nl-ink-muted: #5C6080;
  --nl-ink-faint: #9699AD;
  --nl-surface: #FFFFFF;
  --nl-surface-2: #F3F4FA;
  --nl-surface-3: #EAECF6;
  --nl-border: #DFE1EE;
  --nl-border-strong: #B8BBCE;

  --nl-accent: #3D5AF1;
  --nl-accent-dark: #2440D4;
  --nl-accent-light: #EBF0FF;
  --nl-accent-glow: rgba(61,90,241,0.20);

  --nl-teal: #00BFA8;
  --nl-teal-light: #DDF7F3;
  --nl-amber: #F0940A;
  --nl-amber-light: #FEF0D0;
  --nl-rose: #F23558;
  --nl-rose-light: #FFE4EA;
  --nl-green: #0EA572;
  --nl-green-light: #CDFAEB;

  --nl-grad-hero: radial-gradient(circle at 50% 20%, #1c1545 0%, transparent 60%), radial-gradient(circle at 80% 80%, #2b0b47 0%, transparent 50%), linear-gradient(135deg, #03040a 0%, #080a18 50%, #03040a 100%);
  --nl-grad-accent: linear-gradient(135deg, #3D5AF1 0%, #7B3DF5 100%);
  --nl-grad-accent-vivid: linear-gradient(135deg, #4F6BFF 0%, #9B4BFF 100%);
  --nl-grad-accent-flow: linear-gradient(90deg, #3D5AF1 0%, #00BFA8 25%, #9B4BFF 50%, #3D5AF1 75%, #00BFA8 100%);

  --nl-shadow-xs: 0 1px 3px rgba(9,9,15,0.07), 0 1px 2px rgba(9,9,15,0.05);
  --nl-shadow-sm: 0 2px 8px rgba(9,9,15,0.09), 0 1px 3px rgba(9,9,15,0.06);
  --nl-shadow-md: 0 4px 20px rgba(9,9,15,0.11), 0 2px 8px rgba(9,9,15,0.07);
  --nl-shadow-lg: 0 12px 40px rgba(9,9,15,0.14), 0 4px 16px rgba(9,9,15,0.09);

  --nl-font-display: 'Plus Jakarta Sans', sans-serif;
  --nl-font-body: 'Sora', sans-serif;
  --nl-font-mono: 'JetBrains Mono', monospace;

  --nl-r-sm: 6px; --nl-r-md: 12px; --nl-r-lg: 18px; --nl-r-xl: 24px; --nl-r-full: 9999px;
  --nl-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --nl-dur: 200ms;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--nl-font-body);
  background: var(--nl-surface-2);
  color: var(--nl-ink-soft);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

/* ── READING PROGRESS BAR ── */
.blog-progress {
  position: fixed; top: var(--nl-header-h); left: 0; height: 3px; width: 0%;
  background: var(--nl-grad-accent-vivid); z-index: 999;
  transition: width 0.1s linear;
}

/* ── HERO ── */
.blog-hero {
  background: var(--nl-grad-hero);
  padding: calc(3.8rem + var(--nl-header-h)) 1.5rem 4rem;
  position: relative; overflow: hidden;
}
/* depth vignette — deepens the near corner so the gradient doesn't read flat */
.blog-hero-vignette {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 50% 55% at 0% 0%, rgba(6,10,46,.55) 0%, transparent 60%),
    radial-gradient(ellipse 50% 55% at 100% 0%, rgba(6,10,46,.55) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 50% 105%, rgba(6,10,46,.38) 0%, transparent 62%);
}
/* fine line-grid texture, fading toward the bottom */
.blog-hero::before {
  content: ''; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(180deg, #000 0%, #000 50%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 50%, transparent 100%);
  pointer-events: none;
}
/* two glow-ringed circles, echoing the reference layout with more presence */
.blog-hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(circle at 92% 6%,
      rgba(155,120,255,.10) 0%, rgba(155,120,255,.10) 118px,
      transparent 119px, transparent 148px,
      rgba(255,255,255,.10) 149px, rgba(255,255,255,.10) 151px,
      transparent 152px),
    radial-gradient(circle at 2% 112%,
      rgba(0,191,168,.09) 0%, rgba(0,191,168,.09) 84px,
      transparent 85px, transparent 108px,
      rgba(255,255,255,.08) 109px, rgba(255,255,255,.08) 111px,
      transparent 112px);
}
.blog-hero-inner { max-width: 780px; margin: 0 auto; position: relative; z-index: 1; }
.blog-meta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 1.3rem; }
.blog-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--nl-font-display); font-size: 0.7rem; font-weight: 700;
  padding: 5px 12px; border-radius: var(--nl-r-full);
  letter-spacing: 0.05em; text-transform: uppercase;
  background: rgba(255,255,255,.10); color: rgba(255,255,255,.85); border: 1px solid rgba(255,255,255,.18);
}
.blog-badge svg { width: 11px; height: 11px; }
.blog-hero-title {
  font-family: var(--nl-font-display); font-weight: 800;
  font-size: clamp(1.7rem, 4.6vw, 2.65rem);
  line-height: 1.18; letter-spacing: -0.03em; color: #fff;
  margin-bottom: 1rem; text-shadow: 0 2px 24px rgba(20,24,90,.35);
}
.blog-hero-title .hl {
  background: linear-gradient(135deg, #9FE8DD 0%, #B9C6FF 55%, #E3C8FF 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.blog-hero-desc {
  font-size: 1.02rem; color: rgba(255,255,255,.78); line-height: 1.78;
  max-width: 640px; margin-bottom: 1.7rem;
}
.blog-hero-stats { display: flex; flex-wrap: wrap; gap: 10px; }
.blog-hero-stat {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.8rem; color: rgba(255,255,255,.72); font-weight: 500;
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.12);
  padding: 6px 12px; border-radius: var(--nl-r-full);
}
.blog-hero-stat svg { width: 14px; height: 14px; flex-shrink: 0; color: rgba(255,255,255,.55); }

/* ── HERO SCROLL CUE ── */
.blog-hero-scroll {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.14);
  color: rgba(255,255,255,.65);
  z-index: 2; cursor: pointer;
  transition: border-color var(--nl-dur) var(--nl-ease), color var(--nl-dur) var(--nl-ease), transform var(--nl-dur) var(--nl-ease);
  animation: blogScrollBob 2.2s ease-in-out infinite;
}
.blog-hero-scroll svg { width: 15px; height: 15px; }
.blog-hero-scroll::before {
  content: ''; position: absolute; inset: -2px; border-radius: 50%;
  padding: 2px;
  background: var(--nl-grad-accent-flow);
  background-size: 300% 100%;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: opacity var(--nl-dur) var(--nl-ease);
}
.blog-hero-scroll:hover {
  color: #fff; transform: translateX(-50%) translateY(3px); border-color: transparent;
}
.blog-hero-scroll:hover::before {
  opacity: 1; animation: blogGradientFlow 2.4s linear infinite;
}
@keyframes blogScrollBob {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(5px); }
}
@keyframes blogGradientFlow {
  0%   { background-position: 0% 50%; }
  100% { background-position: 300% 50%; }
}
@media (prefers-reduced-motion: reduce) {
  .blog-hero-scroll { animation: none; }
}

/* ── LAYOUT ── */
.blog-wrap { max-width: 780px; margin: 0 auto; padding: 0 1.5rem; }
.blog-content { padding: 2.5rem 0 4rem; }

/* ── TOC ── */
.blog-toc {
  background: var(--nl-surface); border: 1px solid var(--nl-border);
  border-left: 3px solid var(--nl-accent); border-radius: var(--nl-r-md);
  padding: 1.35rem 1.5rem; margin-bottom: 2.4rem; box-shadow: var(--nl-shadow-xs);
}
.blog-toc h3 {
  font-family: var(--nl-font-display); font-weight: 700; font-size: 0.78rem;
  color: var(--nl-ink-faint); letter-spacing: 0.07em; text-transform: uppercase; margin-bottom: 0.85rem;
}
.blog-toc-list { list-style: none; display: flex; flex-direction: column; gap: 5px; }
.blog-toc-list a {
  font-size: 0.87rem; color: var(--nl-ink-muted); text-decoration: none;
  display: flex; align-items: center; gap: 9px; transition: color var(--nl-dur) var(--nl-ease);
  padding: 4px 6px; border-radius: 6px;
}
.blog-toc-list a:hover, .blog-toc-list a.is-active { color: var(--nl-accent); background: var(--nl-accent-light); }
.blog-toc-num {
  font-family: var(--nl-font-display); font-weight: 700; font-size: 0.68rem;
  color: var(--nl-accent); background: var(--nl-accent-light);
  width: 19px; height: 19px; border-radius: 5px;
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.blog-toc-list a.is-active .blog-toc-num { background: var(--nl-accent); color: #fff; }

/* ── ARTICLE ── */
.blog-section { margin-bottom: 2.75rem; scroll-margin-top: calc(var(--nl-header-h) + 16px); }
.blog-eyebrow {
  font-family: var(--nl-font-display); font-weight: 700; font-size: 0.7rem;
  color: var(--nl-accent); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.5rem;
}
.blog-h2 {
  font-family: var(--nl-font-display); font-weight: 800;
  font-size: clamp(1.2rem, 3.2vw, 1.55rem);
  line-height: 1.3; letter-spacing: -0.02em; color: var(--nl-ink); margin-bottom: 1rem;
}
.blog-h3 {
  font-family: var(--nl-font-display); font-weight: 700; font-size: 1.08rem;
  color: var(--nl-ink); margin: 1.4rem 0 0.7rem; letter-spacing: -0.01em;
}
.blog-p { font-size: 0.98rem; line-height: 1.85; color: var(--nl-ink-muted); margin-bottom: 1rem; }
.blog-p:last-child { margin-bottom: 0; }
.blog-p strong { color: var(--nl-ink-soft); font-weight: 700; }
.blog-p a { color: var(--nl-accent); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
.blog-p a:hover { color: var(--nl-accent-dark); }

.blog-divider {
  height: 1px; background: linear-gradient(90deg, transparent, var(--nl-border), transparent);
  margin: 2.3rem 0;
}

/* ── LISTS ── */
.blog-list { list-style: none; display: flex; flex-direction: column; gap: 10px; margin: 1.1rem 0; }
.blog-list li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 0.95rem; color: var(--nl-ink-muted); line-height: 1.65;
}
.blog-list li::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--nl-accent); flex-shrink: 0; margin-top: 8px;
}
.blog-list.check li::before { display: none; }
.blog-list.check li { position: relative; padding-left: 0; }
.blog-list.check li span.tick {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; border-radius: 50%; background: var(--nl-green-light);
  color: var(--nl-green); font-size: 11px; font-weight: 800; flex-shrink: 0; margin-top: 1px;
}

/* ── IN-ARTICLE IMAGES ── */
.blog-img-frame {
  margin: 1.4rem 0; border-radius: var(--nl-r-lg); border: 1px solid var(--nl-border);
  box-shadow: var(--nl-shadow-md); overflow: hidden; background: var(--nl-surface);
}
.blog-img-frame img { display: block; width: 100%; height: auto; }
.blog-img-caption {
  font-size: 0.78rem; color: var(--nl-ink-faint); text-align: center;
  padding: 10px 14px; background: var(--nl-surface-2); border-top: 1px solid var(--nl-border);
}

/* ── STEPS ── */
.blog-steps { display: flex; flex-direction: column; gap: 0.85rem; margin: 1.2rem 0; }
.blog-step {
  display: flex; gap: 1rem;
  background: var(--nl-surface); border: 1px solid var(--nl-border);
  border-radius: var(--nl-r-md); padding: 1.05rem 1.2rem;
  box-shadow: var(--nl-shadow-xs); transition: box-shadow var(--nl-dur) var(--nl-ease), transform var(--nl-dur) var(--nl-ease);
}
.blog-step:hover { box-shadow: var(--nl-shadow-sm); transform: translateY(-2px); }
.blog-step-num {
  font-family: var(--nl-font-display); font-weight: 800; font-size: 1.15rem;
  color: var(--nl-accent); min-width: 32px; line-height: 1.3;
}
.blog-step-body strong {
  display: block; font-family: var(--nl-font-display); font-weight: 700;
  font-size: 0.94rem; color: var(--nl-ink); margin-bottom: 3px;
}
.blog-step-body p { font-size: 0.87rem; color: var(--nl-ink-muted); line-height: 1.65; margin: 0; }

/* ── CALLOUTS ── */
.blog-callout {
  border-radius: var(--nl-r-md); padding: 1rem 1.2rem; margin: 1.2rem 0;
  display: flex; gap: 10px; font-size: 0.88rem; line-height: 1.65;
}
.blog-callout-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.blog-callout-body strong { font-weight: 700; display: block; margin-bottom: 3px; }
.blog-callout.tip { background: var(--nl-accent-light); border: 1px solid rgba(61,90,241,.22); }
.blog-callout.tip .blog-callout-body { color: #21358f; }
.blog-callout.success { background: var(--nl-green-light); border: 1px solid rgba(14,165,114,.28); }
.blog-callout.success .blog-callout-body { color: #056848; }
.blog-callout.warn { background: var(--nl-amber-light); border: 1px solid rgba(240,148,10,.28); }
.blog-callout.warn .blog-callout-body { color: #8a5406; }
.blog-callout.teal { background: var(--nl-teal-light); border: 1px solid rgba(0,191,168,.28); }
.blog-callout.teal .blog-callout-body { color: #045c50; }

/* ── CHIPS ── */
.blog-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.blog-chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 5px 12px; border-radius: var(--nl-r-full);
  font-size: 0.75rem; font-weight: 700; font-family: var(--nl-font-display);
}
.blog-chip.blue   { background: var(--nl-accent-light); color: var(--nl-accent); border: 1px solid rgba(61,90,241,.2); }
.blog-chip.teal   { background: var(--nl-teal-light); color: #039284; border: 1px solid rgba(0,191,168,.24); }
.blog-chip.green  { background: var(--nl-green-light); color: #067a58; border: 1px solid rgba(14,165,114,.24); }
.blog-chip.amber  { background: var(--nl-amber-light); color: #ad6c07; border: 1px solid rgba(240,148,10,.24); }
.blog-chip.rose   { background: var(--nl-rose-light); color: #c11d3d; border: 1px solid rgba(242,53,88,.22); }

/* ── PROMPT / CODE BOXES ── */
.blog-prompt-box {
  background: var(--nl-surface); border: 1px solid var(--nl-border);
  border-left: 3px solid var(--nl-teal); border-radius: var(--nl-r-sm);
  padding: 12px 16px; margin: 12px 0;
  font-family: var(--nl-font-mono); font-size: 0.82rem;
  color: var(--nl-ink-soft); line-height: 1.65;
  box-shadow: var(--nl-shadow-xs); position: relative;
}
.blog-prompt-box strong {
  display: block; font-family: var(--nl-font-display); font-weight: 700;
  font-size: 0.68rem; color: var(--nl-teal); text-transform: uppercase;
  letter-spacing: 0.06em; margin-bottom: 6px;
}
.blog-code-block {
  background: #0F1123; border-radius: var(--nl-r-md);
  padding: 1.1rem 1.25rem; margin: 1.2rem 0;
  overflow-x: auto; box-shadow: var(--nl-shadow-sm); position: relative;
}
.blog-code-label {
  font-family: var(--nl-font-display); font-weight: 700; font-size: 0.64rem;
  color: #6D71A0; letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 10px; display: block;
}
.blog-code-block pre {
  font-family: var(--nl-font-mono); font-size: 0.8rem; line-height: 1.7;
  color: #E4E5F5; margin: 0; white-space: pre-wrap; word-break: break-word;
}
.blog-copy-btn {
  position: absolute; top: 10px; right: 10px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
  color: rgba(255,255,255,.7); font-family: var(--nl-font-body); font-size: 0.7rem;
  font-weight: 600; padding: 4px 10px; border-radius: var(--nl-r-sm); cursor: pointer;
  transition: background var(--nl-dur) var(--nl-ease), color var(--nl-dur) var(--nl-ease);
}
.blog-copy-btn:hover { background: rgba(255,255,255,.16); color: #fff; }
.blog-copy-btn.copied { background: var(--nl-green); border-color: var(--nl-green); color: #fff; }

/* ── COMPARISON TABLE ── */
.blog-table-wrap { overflow-x: auto; margin: 1.3rem 0; border-radius: var(--nl-r-md); border: 1px solid var(--nl-border); box-shadow: var(--nl-shadow-xs); }
.blog-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; background: var(--nl-surface); min-width: 520px; }
.blog-table thead th {
  background: var(--nl-surface-2); color: var(--nl-ink-faint); font-family: var(--nl-font-display);
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 11px 14px; border-bottom: 1px solid var(--nl-border); text-align: left;
}
.blog-table tbody td { padding: 11px 14px; border-bottom: 1px solid var(--nl-border); color: var(--nl-ink-muted); vertical-align: top; line-height: 1.55; }
.blog-table tbody tr:last-child td { border-bottom: none; }
.blog-table tbody tr:hover { background: var(--nl-surface-2); }
.blog-table .win { color: var(--nl-green); font-weight: 700; }

/* ── RESULT / SUMMARY BOX ── */
.blog-result {
  background: var(--nl-green-light); border: 1px solid rgba(14,165,114,.28);
  border-radius: var(--nl-r-lg); padding: 1.35rem 1.4rem; margin: 1.5rem 0;
}
.blog-result-title {
  font-family: var(--nl-font-display); font-weight: 700; font-size: 0.88rem;
  color: #056848; margin-bottom: 10px; display: flex; align-items: center; gap: 8px;
}
.blog-result-list { list-style: none; display: flex; flex-direction: column; gap: 7px; }
.blog-result-list li { display: flex; align-items: flex-start; gap: 8px; font-size: 0.86rem; color: #056848; line-height: 1.5; }
.blog-result-list li::before { content: '✓'; font-weight: 700; color: var(--nl-green); flex-shrink: 0; margin-top: 1px; }

/* ── FAQ ── */
.blog-faq-item {
  border: 1px solid var(--nl-border); border-radius: var(--nl-r-md);
  margin-bottom: 10px; overflow: hidden; background: var(--nl-surface);
}
.blog-faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 16px; background: none; border: none; cursor: pointer; text-align: left;
  font-family: var(--nl-font-display); font-size: 0.92rem; font-weight: 700; color: var(--nl-ink);
}
.blog-faq-q .plus { font-size: 1.2rem; color: var(--nl-accent); transition: transform var(--nl-dur) var(--nl-ease); flex-shrink: 0; }
.blog-faq-item.open .blog-faq-q .plus { transform: rotate(45deg); }
.blog-faq-a { max-height: 0; overflow: hidden; transition: max-height 0.28s var(--nl-ease); }
.blog-faq-item.open .blog-faq-a { max-height: 300px; }
.blog-faq-a-inner { padding: 0 16px 16px; font-size: 0.87rem; color: var(--nl-ink-muted); line-height: 1.7; }

/* ── AUTHOR STRIP ── */
.blog-author {
  display: flex; align-items: center; gap: 12px;
  background: var(--nl-surface); border: 1px solid var(--nl-border);
  border-radius: var(--nl-r-md); padding: 1rem 1.2rem; margin: 1.5rem 0;
}
.blog-author-avatar {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--nl-grad-accent); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-family: var(--nl-font-display); font-weight: 700; font-size: 0.92rem;
}
.blog-author-info strong { display: block; font-family: var(--nl-font-display); font-size: 0.88rem; color: var(--nl-ink); }
.blog-author-info span { font-size: 0.78rem; color: var(--nl-ink-faint); }

/* ── RELATED / EXPLORE STRIP ── */
.blog-related {
  background: var(--nl-ink); border-radius: var(--nl-r-lg);
  padding: 1.8rem; margin-top: 2.5rem;
}
.blog-related h3 {
  font-family: var(--nl-font-display); font-weight: 800; font-size: 1.05rem;
  color: #fff; margin-bottom: 1rem; letter-spacing: -0.01em;
}
.blog-related-grid { display: flex; flex-direction: column; gap: 8px; }
.blog-related-link {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px; border-radius: var(--nl-r-md);
  background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.08);
  color: rgba(255,255,255,.82); font-size: 0.85rem; font-weight: 600;
  transition: background var(--nl-dur) var(--nl-ease), transform var(--nl-dur) var(--nl-ease);
}
.blog-related-link:hover { background: rgba(61,90,241,.18); transform: translateX(4px); }
.blog-related-link .arrow { margin-left: auto; color: var(--nl-accent); flex-shrink: 0; }

/* ── BACK TO TOP ── */
.blog-back-top {
  position: fixed; bottom: 28px; right: 28px; z-index: 800;
  width: 44px; height: 44px; border-radius: var(--nl-r-full);
  background: var(--nl-grad-accent-flow); background-size: 300% 100%; background-position: 0% 50%;
  color: #fff;
  display: grid; place-items: center; box-shadow: var(--nl-shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity var(--nl-dur) var(--nl-ease), visibility var(--nl-dur), transform var(--nl-dur) var(--nl-ease), box-shadow var(--nl-dur) var(--nl-ease);
  cursor: pointer; border: none;
}
.blog-back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.blog-back-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 28px rgba(61,90,241,.38), var(--nl-shadow-md);
  animation: blogGradientFlow 2.2s linear infinite;
}

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .blog-hero { padding: calc(3rem + var(--nl-header-h)) 1.25rem 3.2rem; }
  .blog-content { padding: 2.2rem 0 3.5rem; }
}

@media (max-width: 640px) {
  html { font-size: 15px; }
  .blog-hero { padding: calc(2.2rem + var(--nl-header-h)) 1rem 2.4rem; }
  .blog-hero-title { font-size: clamp(1.5rem, 7vw, 2rem); line-height: 1.22; }
  .blog-hero-desc { font-size: 0.94rem; line-height: 1.68; }
  .blog-hero-stats { gap: 8px; }
  .blog-hero-stat { font-size: 0.74rem; padding: 5px 10px; }

  .blog-wrap { padding: 0 1rem; }
  .blog-toc { padding: 1.1rem 1.2rem; margin-bottom: 1.8rem; }
  .blog-h2 { font-size: clamp(1.1rem, 5.5vw, 1.35rem); }
  .blog-h3 { font-size: 1rem; }
  .blog-p { font-size: 0.92rem; line-height: 1.75; }

  .blog-step { flex-direction: column; gap: 6px; padding: 1rem; }
  .blog-step-num { min-width: auto; }

  .blog-prompt-box, .blog-code-block { padding: 0.9rem 1rem; font-size: 0.78rem; }
  .blog-table { min-width: 460px; font-size: 0.8rem; }
  .blog-table thead th, .blog-table tbody td { padding: 9px 11px; }

  .blog-callout { padding: 0.85rem 1rem; font-size: 0.84rem; }
  .blog-result { padding: 1.1rem 1.2rem; }
  .blog-related { padding: 1.4rem; }
  .blog-related-link { font-size: 0.82rem; padding: 11px 12px; }

  .blog-img-caption { font-size: 0.72rem; padding: 8px 12px; }
  .blog-back-top { bottom: 18px; right: 18px; width: 40px; height: 40px; }
}

@media (max-width: 400px) {
  .blog-hero-title { font-size: 1.4rem; }
  .blog-badge { font-size: 0.64rem; padding: 4px 10px; }
  .blog-hero-stat { font-size: 0.7rem; }
  .blog-toc-list a { font-size: 0.82rem; }
}