/* =========================================================================
   LLMQA Blog — modern light theme (matches the LLMQA brand)
   Inter type · white/slate UI · violet→fuchsia→cyan gradient accents.
   ========================================================================= */

:root {
  --brand-gradient: linear-gradient(90deg, #7C3AED 0%, #C026D3 50%, #06B6D4 100%);
  --brand-gradient-diagonal: linear-gradient(135deg, #7C3AED 0%, #C026D3 50%, #06B6D4 100%);
  --violet: #7C3AED;
  --bg: #FFFFFF;
  --surface: #FFFFFF;
  --surface-2: #F1F5F9;
  --text: #0F172A;
  --body: #475569;
  --muted: #64748B;
  --subhead: #334155;
  --border: #E2E8F0;
  --primary: #7C3AED;
  --maxw: 1120px;
  --radius: 16px;
  --radius-sm: 10px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-sm: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
  --shadow: 0 12px 32px -14px rgba(15,23,42,.18);
  --shadow-lg: 0 28px 70px -34px rgba(79,38,160,.28);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--body); background: var(--bg);
  font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 4px; }

.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(20px, 5vw, 40px); }
.container--narrow { max-width: 760px; }
.grad { background: var(--brand-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- Nav ---------- */
.bnav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.82); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.bnav__inner { max-width: var(--maxw); margin-inline: auto; padding: 14px clamp(20px,5vw,40px); display: flex; align-items: center; gap: 16px; }
.bnav__brand { display: inline-flex; }
.bnav__brand img { height: 28px; width: auto; }
.bnav__links { margin-left: auto; display: flex; align-items: center; gap: 22px; font-size: 14px; font-weight: 600; }
.bnav__links a { color: var(--subhead); }
.bnav__links a[aria-current="page"] { color: var(--primary); }
.bnav__links a:hover { text-decoration: none; color: var(--primary); }
.bnav__cta { background: var(--brand-gradient); color: #fff !important; padding: 9px 16px; border-radius: 999px; box-shadow: 0 10px 22px -12px rgba(124,58,237,.6); }
.bnav__cta:hover { transform: translateY(-1px); }

/* ---------- Blog hero ---------- */
.blog-hero { padding-block: clamp(40px, 7vw, 76px) clamp(24px,4vw,40px); text-align: center;
  background: radial-gradient(800px 360px at 50% -10%, rgba(124,58,237,.10), transparent 60%); }
.blog-hero__eyebrow { font-size: 12px; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; color: var(--primary); margin: 0 0 14px; }
.blog-hero__title { font-weight: 800; letter-spacing: -.03em; font-size: clamp(2.25rem, 5.5vw, 3.5rem); line-height: 1.04; color: var(--text); margin: 0 auto 18px; max-width: 16ch; }
.blog-hero__sub { color: var(--body); font-size: clamp(1rem,1.6vw,1.15rem); max-width: 60ch; margin: 0 auto; }

/* ---------- Chips ---------- */
.chip { display: inline-block; font-size: 12px; font-weight: 600; color: var(--primary); background: rgba(124,58,237,.08); border: 1px solid rgba(124,58,237,.20); padding: 4px 10px; border-radius: 999px; letter-spacing: .01em; }
.chip--solid { color: #fff; background: var(--brand-gradient); border: 0; }

/* ---------- Thumbs (gradient, no images needed) ---------- */
.card__thumb, .feature__thumb { position: relative; overflow: hidden; background: var(--brand-gradient-diagonal); }
.card__thumb::after, .feature__thumb::after { content: ""; position: absolute; inset: 0;
  background: radial-gradient(120px 120px at 80% 20%, rgba(255,255,255,.25), transparent 60%); }
.card__mark, .feature__mark { position: absolute; right: 14px; bottom: 8px; font-family: var(--font); font-weight: 800; font-size: 2.2rem; color: rgba(255,255,255,.85); letter-spacing: -.04em; }
.card__thumb[data-variant="2"], .feature__thumb[data-variant="2"] { background: linear-gradient(135deg,#6D28D9,#7C3AED 55%,#C026D3); }
.card__thumb[data-variant="3"], .feature__thumb[data-variant="3"] { background: linear-gradient(135deg,#C026D3,#DB2777 55%,#7C3AED); }
.card__thumb[data-variant="4"], .feature__thumb[data-variant="4"] { background: linear-gradient(135deg,#7C3AED,#3B82F6 55%,#06B6D4); }
.card__thumb[data-variant="5"], .feature__thumb[data-variant="5"] { background: linear-gradient(135deg,#0EA5E9,#06B6D4 50%,#7C3AED); }

/* cover images (fall back to the gradient thumb if the SVG is missing) */
.card__img, .feature__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.card__thumb:has(img)::after, .feature__thumb:has(img)::after { display: none; }
.post__cover { display: block; width: 100%; aspect-ratio: 1200 / 630; object-fit: cover; border-radius: var(--radius); box-shadow: var(--shadow); margin: 4px 0 30px; background: var(--brand-gradient-diagonal); }

/* ---------- Featured ---------- */
.feature { display: grid; grid-template-columns: 1.1fr 1fr; gap: 0; margin-top: 8px; background: var(--surface); border: 1px solid var(--border); border-radius: calc(var(--radius) + 4px); overflow: hidden; box-shadow: var(--shadow); transition: transform .2s var(--ease), box-shadow .2s var(--ease); }
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); text-decoration: none; }
.feature__thumb { min-height: 240px; }
.feature__body { padding: clamp(24px,3vw,40px); display: flex; flex-direction: column; gap: 12px; align-items: flex-start; justify-content: center; }
.feature__title { font-size: clamp(1.4rem,2.4vw,1.9rem); font-weight: 800; letter-spacing: -.02em; color: var(--text); line-height: 1.15; }
.feature__excerpt { color: var(--body); font-size: 1rem; }

/* ---------- Card grid ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; padding-block: 32px clamp(40px,6vw,72px); }
.card { display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s var(--ease); }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(124,58,237,.4); text-decoration: none; }
.card__thumb { height: 150px; }
.card__mark { font-size: 1.7rem; right: 12px; bottom: 6px; }
.card__body { padding: 20px 22px 24px; display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.card__title { font-size: 1.18rem; font-weight: 700; letter-spacing: -.02em; color: var(--text); line-height: 1.25; }
.card__excerpt { color: var(--body); font-size: .94rem; }
.card__meta { color: var(--muted); font-size: .8rem; margin-top: auto; }

/* ---------- Post ---------- */
.post { padding-top: clamp(28px, 4vw, 48px); }
.post__head { margin-bottom: clamp(24px,3vw,36px); }
.post__back { font-size: 14px; font-weight: 600; color: var(--muted); }
.post__back:hover { color: var(--primary); text-decoration: none; }
.post__tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }
.post__title { font-size: clamp(1.9rem, 4vw, 2.8rem); font-weight: 800; letter-spacing: -.03em; line-height: 1.1; color: var(--text); margin: 14px 0 16px; }
.post__meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; color: var(--muted); font-size: 14px; }
.post__meta span:first-child { color: var(--subhead); font-weight: 600; }

/* post content typography */
.post__content { font-size: 1.075rem; line-height: 1.8; color: var(--body); }
.post__content > p:first-child { font-size: 1.2rem; line-height: 1.6; color: var(--text); border-left: 3px solid transparent; border-image: var(--brand-gradient) 1; padding: 4px 0 4px 20px; margin-bottom: 28px; }
.post__content h2 { font-size: clamp(1.4rem,2.4vw,1.7rem); font-weight: 700; letter-spacing: -.02em; color: var(--text); line-height: 1.25; margin: 40px 0 14px; padding-top: 8px; }
.post__content h3 { font-size: 1.2rem; font-weight: 700; color: var(--text); margin: 28px 0 10px; }
.post__content p { margin: 0 0 18px; }
.post__content a { color: var(--primary); font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
.post__content ul, .post__content ol { margin: 0 0 18px; padding-left: 24px; }
.post__content li { margin: 0 0 8px; }
.post__content li::marker { color: var(--violet); }
.post__content strong { color: var(--text); font-weight: 700; }
.post__content blockquote { margin: 24px 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--violet); color: var(--subhead); font-style: italic; }
.post__content code { font-family: var(--mono); font-size: .9em; background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; padding: 2px 6px; }
.post__content pre { background: #0F172A; color: #E2E8F0; padding: 18px 20px; border-radius: var(--radius-sm); overflow-x: auto; margin: 0 0 18px; }
.post__content pre code { background: none; border: 0; padding: 0; color: inherit; }

/* tables */
.post__content table { width: 100%; border-collapse: collapse; margin: 8px 0 26px; font-size: .95rem; display: block; overflow-x: auto; }
.post__content thead { background: var(--surface-2); }
.post__content th, .post__content td { text-align: left; padding: 11px 14px; border: 1px solid var(--border); vertical-align: top; }
.post__content th { color: var(--text); font-weight: 700; }
.post__content tbody tr:nth-child(even) { background: #FAFBFD; }

/* in-post CTA */
.post__cta { margin: 44px 0 8px; padding: 28px 28px 30px; border-radius: var(--radius); background: radial-gradient(500px 200px at 50% 0%, rgba(124,58,237,.10), transparent 70%), var(--surface-2); border: 1px solid var(--border); text-align: center; }
.post__cta h3 { font-size: 1.25rem; font-weight: 800; letter-spacing: -.02em; color: var(--text); margin: 0 0 8px; }
.post__cta p { color: var(--body); margin: 0 auto 18px; max-width: 52ch; }
.post__cta-btn { display: inline-block; background: var(--brand-gradient); color: #fff; font-weight: 600; font-size: 14px; padding: 12px 22px; border-radius: 999px; box-shadow: 0 12px 26px -12px rgba(124,58,237,.6); }
.post__cta-btn:hover { transform: translateY(-1px); text-decoration: none; }

/* more posts */
.more { border-top: 1px solid var(--border); margin-top: clamp(40px,6vw,72px); padding-top: 8px; background: var(--surface-2); }
.more__title { font-size: 1.4rem; font-weight: 800; letter-spacing: -.02em; color: var(--text); margin: 36px 0 0; }

/* ---------- Footer ---------- */
.bfoot { border-top: 1px solid var(--border); background: var(--surface); padding-block: 36px; }
.bfoot__inner { max-width: var(--maxw); margin-inline: auto; padding-inline: clamp(20px,5vw,40px); display: flex; flex-direction: column; align-items: center; gap: 10px; text-align: center; }
.bfoot__logo { height: 22px; width: auto; }
.bfoot__line { color: var(--muted); font-size: .92rem; margin: 0; }
.bfoot__legal { color: var(--muted); font-size: 12px; margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .feature { grid-template-columns: 1fr; }
  .feature__thumb { min-height: 150px; }
  .bnav__links { gap: 14px; }
  .bnav__links a:not(.bnav__cta) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}