:root {
  --void: #F7F8FC;
  --ink: #15203A;
  --ink-dim: rgba(21, 32, 58, 0.78);
  --ink-faint: rgba(21, 32, 58, 0.52);
  --mercury-a: #527BCF;
  --mercury-b: #8D6BC7;
  --mercury-c: #168F80;
  --glass-fill: linear-gradient(135deg, rgba(255,255,255,0.88), rgba(244,247,255,0.64) 42%, rgba(239,235,255,0.60));
  --glass-line: rgba(55, 72, 112, 0.14);
  --font-display: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(82, 123, 207, 0.24); color: #15203A; }

.mono {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.ambient {
  position: fixed;
  inset: -20%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
}
.g1 {
  width: 50vmax; height: 50vmax;
  left: 10%; top: -5%;
  background: radial-gradient(closest-side, rgba(91, 133, 226, 0.22), transparent 72%);
}
.g2 {
  width: 44vmax; height: 44vmax;
  right: -5%; bottom: 10%;
  background: radial-gradient(closest-side, rgba(163, 117, 225, 0.18), transparent 72%);
}

.site-header {
  position: relative;
  z-index: 2;
  max-width: 920px;
  margin: 0 auto;
  padding: 28px 24px 0 84px;
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 16px;
}
.site-logo {
  position: fixed;
  top: max(18px, env(safe-area-inset-top, 0px) + 12px);
  left: 20px;
  z-index: 40;
  text-decoration: none;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  padding: 7px;
  border-radius: 13px;
  overflow: hidden;
  background:
    radial-gradient(circle at 29% 19%, rgba(255,255,255,.82) 0 7%, rgba(255,255,255,.20) 24%, transparent 42%),
    radial-gradient(circle at 72% 78%, rgba(159,242,228,.18), transparent 42%),
    linear-gradient(145deg, rgba(255,255,255,.36), rgba(182,198,242,.11) 48%, rgba(183,142,232,.17));
  border: 1px solid rgba(255,255,255,.62);
  -webkit-backdrop-filter: blur(26px) saturate(220%);
  backdrop-filter: blur(26px) saturate(220%);
  box-shadow: 0 8px 22px rgba(38,55,96,.11), inset 0 1px 1px rgba(255,255,255,.74), inset 0 -4px 9px rgba(91,77,160,.06);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.site-logo:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(38, 55, 96, 0.18), inset 0 1px 0 rgba(255,255,255,0.94); }
.site-logo::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: 11px;
  padding: 1px;
  background: conic-gradient(from 210deg, rgba(159,242,228,.09), rgba(255,255,255,.44), rgba(180,147,241,.12), rgba(255,255,255,.05), rgba(159,242,228,.09));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
}
.site-logo::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(145deg, rgba(255,255,255,.24), transparent 48%);
}
.site-logo img { position: relative; z-index: 1; width: 100%; height: 100%; display: block; filter: drop-shadow(0 2px 3px rgba(39,74,145,.18)); }
.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a {
  color: var(--ink-faint);
  text-decoration: none;
  font-size: 10px;
  transition: color 0.25s ease;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--mercury-a); }

main {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.blog-hero {
  position: relative;
  min-height: 390px;
  overflow: hidden;
  padding: clamp(58px, 8vw, 86px) clamp(30px, 6vw, 58px) 118px;
  border-radius: 32px;
  color: #F2F4FA;
  background:
    radial-gradient(circle at 82% 22%, rgba(141,107,199,0.18), transparent 34%),
    linear-gradient(155deg, #08080C, #11121A 72%, #232430);
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: 0 30px 80px rgba(38,55,96,0.18), inset 0 1px 0 rgba(255,255,255,0.10);
}
.blog-hero::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -72px;
  top: -92px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 28%, rgba(255,255,255,0.42), transparent 9%),
    radial-gradient(circle at 32% 38%, rgba(82,123,207,0.88), transparent 48%),
    radial-gradient(circle at 68% 62%, rgba(141,107,199,0.86), rgba(47,49,79,0.76) 68%, rgba(8,8,12,0.20) 72%);
  border: 1px solid rgba(168,198,255,0.34);
  box-shadow: inset 0 0 65px rgba(255,255,255,0.12), 0 0 80px rgba(82,123,207,0.22);
  opacity: 0.88;
}
.blog-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.54;
  background-image:
    radial-gradient(circle at 12% 18%, rgba(168,198,255,0.9) 0 1px, transparent 1.5px),
    radial-gradient(circle at 68% 74%, rgba(230,216,255,0.8) 0 1px, transparent 1.5px),
    radial-gradient(circle at 38% 62%, rgba(159,242,228,0.7) 0 1px, transparent 1.5px);
  background-size: 92px 92px, 137px 137px, 173px 173px;
  pointer-events: none;
}
.blog-hero > * { position: relative; z-index: 1; }
.blog-hero .section-tag { display: block; margin-bottom: 18px; color: #9FF2E4; font-size: 10px; }
.blog-hero h1 { max-width: 610px; font-size: clamp(42px, 7vw, 72px); line-height: 0.98; letter-spacing: -0.04em; }
.blog-hero h1 span {
  background: linear-gradient(100deg, #A8C6FF, #E6D8FF 58%, #9FF2E4);
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.blog-hero p { max-width: 520px; margin-top: 24px; color: rgba(242,244,250,0.76); font-size: 16px; }

.page-head { margin-bottom: 40px; }
.page-head .tag {
  display: inline-block;
  font-size: 10px;
  color: var(--mercury-c);
  margin-bottom: 14px;
}
.page-head h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 14px;
}
.page-head p {
  color: var(--ink-dim);
  font-weight: 400;
  font-size: 17px;
  max-width: 620px;
}

.glass {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(26px) saturate(170%);
  backdrop-filter: blur(26px) saturate(170%);
  border: 1px solid var(--glass-line);
  border-radius: 24px;
  box-shadow: 0 24px 60px rgba(38, 55, 96, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.82);
}

.post-list { position: relative; z-index: 2; display: grid; gap: 18px; margin: -64px 24px 0; }
.post-card {
  position: relative;
  overflow: hidden;
  display: block;
  padding: 32px 34px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}
.post-card:hover {
  border-color: rgba(168, 198, 255, 0.35);
  transform: translateY(-2px);
  box-shadow: 0 28px 64px rgba(38, 55, 96, 0.16), 0 0 40px rgba(82, 123, 207, 0.10);
}
.post-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 28px;
  bottom: 28px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(var(--mercury-a), var(--mercury-b), var(--mercury-c));
  opacity: 0.66;
}
.post-card .post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 10px;
  color: var(--ink-faint);
  margin-bottom: 12px;
}
.post-card h2 {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.post-card p {
  color: var(--ink-dim);
  font-weight: 400;
  font-size: 15px;
}
.post-card .tags {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tag-pill {
  font-size: 9px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(55, 72, 112, 0.14);
  color: var(--ink-faint);
}

.article-wrap { padding: clamp(32px, 5vw, 56px); }
.article-head { margin-bottom: 32px; padding-bottom: 28px; border-bottom: 1px solid rgba(55,72,112,0.10); }
.article-head h1 {
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 10px;
  color: var(--ink-faint);
}
.article-body {
  color: var(--ink-dim);
  font-weight: 400;
  font-size: 17px;
}
.article-body h2 {
  color: var(--ink);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 36px 0 14px;
}
.article-body h3 {
  color: var(--ink);
  font-size: 20px;
  font-weight: 500;
  margin: 28px 0 10px;
}
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol {
  margin: 0 0 18px 1.2em;
}
.article-body li { margin-bottom: 8px; }
.article-body a {
  color: var(--mercury-a);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 198, 255, 0.35);
}
.article-body a:hover { border-color: rgba(168, 198, 255, 0.8); }
.article-body em {
  font-style: normal;
  color: var(--ink);
}
.article-body blockquote {
  margin: 28px 0;
  padding: 20px 24px;
  border-left: 2px solid var(--mercury-a);
  background: rgba(255, 255, 255, 0.03);
  border-radius: 0 12px 12px 0;
  color: var(--ink);
  font-size: 18px;
}

.faq { margin-top: 40px; }
.faq-item {
  padding: 20px 0;
  border-bottom: 1px solid rgba(55, 72, 112, 0.10);
}
.faq-item:last-child { border-bottom: 0; }
.faq-item h3 {
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 8px;
}
.faq-item p { font-size: 15px; margin: 0; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  color: var(--ink-faint);
  text-decoration: none;
  font-size: 10px;
  transition: color 0.25s ease;
}
.back-link:hover { color: var(--mercury-a); }

.site-footer {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  color: var(--ink-faint);
  font-size: 10px;
}
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a {
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.25s ease;
}
.footer-links a:hover { color: var(--mercury-a); }

@media (max-width: 640px) {
  .site-header { flex-direction: column; align-items: flex-start; padding-left: 70px; }
  .site-logo { top: max(14px, env(safe-area-inset-top, 0px) + 10px); left: 14px; width: 30px; height: 30px; padding: 6px; border-radius: 11px; }
  main { padding-top: 38px; }
  .blog-hero { min-height: 360px; padding: 58px 25px 104px; border-radius: 26px; }
  .blog-hero::before { width: 280px; height: 280px; right: -145px; top: -44px; opacity: 0.74; }
  .blog-hero h1 { font-size: clamp(40px, 13vw, 58px); }
  .blog-hero p { font-size: 15px; }
  .post-list { margin: -52px 12px 0; }
  .post-card { padding: 22px 20px; }
}

@media (prefers-reduced-motion: reduce) {
  .site-logo::after { animation: none; }
}