/* VinRecordHub Blog — vibrant, full-width design. Shares theme.css for sitewide tokens;
   only cluster-category accents and layout dimensions are blog-specific. */
:root{
  --bg-2:oklch(7.5% .018 252);--body:oklch(93% .008 252);--c-alt:oklch(80% .19 55);--c-aff:oklch(80% .19 155);--c-veh:oklch(78% .17 245);--c-vin:oklch(76% .21 305);--c-rev:oklch(74% .22 25);
  --theme:var(--accent);                /* overridden per page via .theme-* */
  --max:1240px;--read:720px;--pad:clamp(1.1rem,4vw,2.5rem);
  --ease:var(--expo);                   /* blog's "--ease" was theme.css's "--expo" curve */
}
[data-theme="light"]{--bg-2:oklch(95% .013 85);--body:oklch(28% .022 290);--c-alt:oklch(52% .15 55);--c-aff:oklch(46% .13 155);--c-veh:oklch(46% .13 245);--c-vin:oklch(48% .19 305);--c-rev:oklch(48% .18 25)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--body);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  line-height:1.7;-webkit-font-smoothing:antialiased;font-size:1.075rem;
  background-image:radial-gradient(1200px 600px at 100% -10%, color-mix(in oklab, var(--c-alt) 6%, transparent), transparent 60%),
                   radial-gradient(1000px 500px at -10% 10%, color-mix(in oklab, var(--c-vin) 5%, transparent), transparent 55%);
  background-attachment:fixed}
a{color:var(--theme);text-decoration:none}
a:hover{text-decoration:underline}
.theme-alt{--theme:var(--c-alt)}.theme-aff{--theme:var(--c-aff)}
.theme-veh{--theme:var(--c-veh)}.theme-vin{--theme:var(--c-vin)}.theme-rev{--theme:var(--c-rev)}

/* ---------- Nav ---------- */
.nav-shell{position:sticky;top:0;z-index:50;background:var(--overlay-nav);
  backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
nav{max-width:1440px;margin:0 auto;padding:.95rem clamp(1.25rem,2.5vw,3rem);display:flex;align-items:center;
  justify-content:space-between;gap:1rem}
.logo{display:flex;align-items:center;gap:.5rem;font-size:1.05rem;font-weight:800;letter-spacing:-.04em;color:var(--text)}
.logo:hover{text-decoration:none}
.logo-r{color:var(--accent)}.logo-h{color:var(--faint);font-weight:400}
.nav-links{display:flex;align-items:center;gap:1.5rem}
.nav-links a{color:var(--muted);font-size:.92rem;font-weight:500}
.nav-links a:hover{color:var(--text);text-decoration:none}
.nav-cta{background:var(--cta);color:var(--on-cta)!important;padding:.55rem 1rem;border-radius:9px;
  font-weight:700;font-size:.88rem!important;box-shadow:0 4px 18px color-mix(in oklab, var(--cta) 35%, transparent)}
.nav-cta:hover{filter:brightness(1.08);text-decoration:none}
@media(max-width:680px){.nav-links a:not(.nav-cta){display:none}}

/* ---------- Full-bleed hero band ---------- */
.hero-band{position:relative;overflow:hidden;border-bottom:1px solid var(--border);
  background:linear-gradient(180deg, color-mix(in oklch, var(--theme) 13%, var(--bg)), var(--bg) 75%)}
.hero-band::before{content:'';position:absolute;inset:0;z-index:0;
  background:radial-gradient(680px 340px at 82% 0%, color-mix(in oklch, var(--theme) 30%, transparent), transparent 70%)}
.hero-band::after{content:'';position:absolute;inset:0;z-index:0;opacity:.5;
  background-image:linear-gradient(color-mix(in oklab, var(--text) 4%, transparent) 1px,transparent 1px),
                   linear-gradient(90deg, color-mix(in oklab, var(--text) 4%, transparent) 1px,transparent 1px);
  background-size:42px 42px;mask-image:radial-gradient(70% 80% at 70% 0%,#000,transparent)}
.hero3d{position:absolute;inset:0;width:100%;height:100%;z-index:1;pointer-events:none;display:block}
.hero-band .hero3d{opacity:.5}
.idx-hero .hero3d{opacity:.85}
.hero-in{position:relative;z-index:2;max-width:var(--max);margin:0 auto;padding:clamp(2rem,5vw,3.6rem) var(--pad);
  display:grid;grid-template-columns:1fr auto;gap:2rem;align-items:center}
.hero-art{width:clamp(120px,16vw,210px);height:auto;color:var(--theme);flex-shrink:0;filter:drop-shadow(0 10px 30px color-mix(in oklch,var(--theme) 40%,transparent))}
@media(max-width:760px){.hero-in{grid-template-columns:1fr}.hero-art{display:none}}

.eyebrow{display:inline-flex;align-items:center;gap:.45rem;background:color-mix(in oklch,var(--theme) 16%,transparent);
  border:1px solid color-mix(in oklch,var(--theme) 40%,transparent);color:var(--theme);
  padding:.35rem .8rem;border-radius:999px;font-size:.78rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.eyebrow svg{width:15px;height:15px}
.hero-in h1{font-size:clamp(1.9rem,4.6vw,3rem);font-weight:900;letter-spacing:-.035em;line-height:1.08;
  margin:1rem 0 .8rem;color:var(--text);max-width:18ch}
.hero-lede{font-size:clamp(1.05rem,2.2vw,1.28rem);color:var(--muted);max-width:60ch;line-height:1.55}
.crumbs{position:relative;z-index:2;max-width:var(--max);margin:0 auto;padding:1rem var(--pad) 0;font-size:.82rem;color:var(--faint)}
.crumbs a{color:var(--muted)}

/* ---------- Article: two-column ---------- */
.shell{max-width:var(--max);margin:0 auto;padding:2.4rem var(--pad) 1rem;
  display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:clamp(2rem,4vw,3.5rem);align-items:start}
@media(max-width:980px){.shell{grid-template-columns:1fr}}
.post-main{max-width:var(--read)}
.post-main h2{font-size:clamp(1.35rem,2.6vw,1.7rem);font-weight:800;letter-spacing:-.02em;color:var(--text);
  margin:2.6rem 0 .9rem;padding-left:.9rem;border-left:4px solid var(--theme);scroll-margin-top:90px}
.post-main h3{font-size:1.12rem;font-weight:700;color:var(--text);margin:1.7rem 0 .5rem}
.post-main p{margin:0 0 1.15rem;color:var(--body)}
.post-main ul,.post-main ol{margin:0 0 1.3rem 1.3rem;color:var(--body)}
.post-main li{margin:.45rem 0}
.post-main li::marker{color:var(--theme)}
.post-main strong{color:var(--text);font-weight:700}
.post-main a{font-weight:600;text-decoration:underline;text-decoration-color:color-mix(in oklch,var(--theme) 45%,transparent);text-underline-offset:3px}

/* Tables */
/* display:block + overflow-x lets wide tables scroll instead of forcing the
   whole content column past the viewport on narrow phones. */
table{display:block;width:100%;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;
  border-collapse:separate;border-spacing:0;margin:1.6rem 0;font-size:.96rem;
  border:1px solid var(--border);border-radius:14px}
thead{background:color-mix(in oklch,var(--theme) 12%,var(--surface))}
th,td{text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--border)}
th{color:var(--text);font-weight:700;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover{background:var(--surface)}
tbody tr:nth-last-child(1){background:color-mix(in oklch,var(--theme) 10%,transparent)}

/* CTA box (inline) */
.cta-box{position:relative;overflow:hidden;background:linear-gradient(135deg,
  color-mix(in oklch,var(--theme) 22%,var(--surface)),var(--surface2));
  border:1px solid color-mix(in oklch,var(--theme) 40%,transparent);
  border-radius:18px;padding:2rem;margin:2.6rem 0;text-align:center;
  box-shadow:0 20px 50px var(--shadow-color)}
.cta-box h3{font-size:1.45rem;color:var(--text);margin:0 0 .5rem;font-weight:800}
.cta-box p{color:var(--muted);margin:0 0 1.3rem}
.btn{display:inline-block;background:var(--theme);color:var(--on-accent);padding:.85rem 1.7rem;
  border-radius:11px;font-weight:800;font-size:.98rem;box-shadow:0 8px 26px color-mix(in oklch,var(--theme) 45%,transparent);
  transition:transform .15s var(--ease),filter .15s var(--ease)}
.btn:hover{filter:brightness(1.08);transform:translateY(-2px);text-decoration:none}
.btn-ghost{background:transparent;border:1px solid var(--border-2);color:var(--text);box-shadow:none;margin-left:.5rem}
.btn-ghost:hover{background:var(--surface);border-color:var(--theme)}

/* FAQ */
.faq{margin:2.8rem 0}
.faq h2{font-size:1.5rem;color:var(--text);font-weight:800;margin-bottom:1rem}
.faq details{border:1px solid var(--border);border-radius:13px;padding:.2rem 1.1rem;margin-bottom:.75rem;
  background:var(--surface);transition:border-color .2s}
.faq details[open]{border-color:color-mix(in oklch,var(--theme) 45%,transparent)}
.faq summary{cursor:pointer;font-weight:700;color:var(--text);padding:.95rem 0;list-style:none;font-size:1.02rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';float:right;color:var(--theme);font-weight:800;font-size:1.3rem;line-height:1}
.faq details[open] summary::after{content:'–'}
.faq details p{padding:0 0 1rem;color:var(--muted);margin:0}

/* Related + back link */
.related{margin:2.8rem 0 1rem;padding-top:1.6rem;border-top:1px solid var(--border)}
.related h3{font-size:.9rem;color:var(--faint);margin-bottom:.9rem;text-transform:uppercase;letter-spacing:.06em}
.related a{display:inline-block;margin:.3rem .6rem .3rem 0;padding:.5rem .9rem;background:var(--surface);
  border:1px solid var(--border);border-radius:9px;color:var(--text);font-weight:600;font-size:.9rem}
.related a:hover{border-color:var(--theme);text-decoration:none}
.back-home{display:inline-block;margin:1.2rem 0;color:var(--muted);font-weight:600}

/* ---------- Sticky sidebar ---------- */
.sidebar{position:sticky;top:88px;align-self:start;display:flex;flex-direction:column;gap:1.1rem;min-width:0}
@media(max-width:980px){.sidebar{position:static;top:auto}}
.side-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:1.3rem}
.side-cta{background:linear-gradient(160deg,color-mix(in oklch,var(--theme) 26%,var(--surface)),var(--surface2));
  border:1px solid color-mix(in oklch,var(--theme) 45%,transparent);text-align:center}
.side-cta .price{font-size:2.1rem;font-weight:900;color:var(--text);letter-spacing:-.03em;line-height:1}
.side-cta .price span{font-size:.95rem;font-weight:600;color:var(--muted)}
.side-cta p{color:var(--muted);font-size:.88rem;margin:.5rem 0 1rem}
.side-cta .btn{display:block;margin:0}
.side-title{font-size:.8rem;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);font-weight:700;margin-bottom:.7rem}
.toc{display:flex;flex-direction:column;gap:.1rem;counter-reset:toc}
.toc a{display:block;color:var(--muted);font-size:.9rem;line-height:1.4;padding:.5rem 0 .5rem .85rem;border-left:2px solid var(--border);
  white-space:normal;overflow-wrap:break-word;word-break:normal;hyphens:none;transition:color .15s,border-color .15s}
.toc a::before{counter-increment:toc;content:counter(toc) ". ";color:var(--faint);font-weight:700}
.toc a:last-child::before{content:""}
.toc a:hover{color:var(--theme);border-color:var(--theme);text-decoration:none}
.side-trust{display:flex;flex-direction:column;gap:.6rem}
.side-trust div{display:flex;align-items:center;gap:.55rem;font-size:.9rem;color:var(--body)}
.side-trust svg{width:18px;height:18px;color:var(--theme);flex-shrink:0}

/* ---------- Blog index ---------- */
.idx-hero{position:relative;overflow:hidden;border-bottom:1px solid var(--border);text-align:center;
  background:radial-gradient(900px 420px at 50% -20%, color-mix(in oklab, var(--c-alt) 14%, transparent), transparent 65%)}
.idx-hero-in{position:relative;z-index:2;max-width:var(--max);margin:0 auto;padding:clamp(3rem,7vw,5rem) var(--pad)}
.idx-hero h1{font-size:clamp(2.4rem,6vw,3.8rem);font-weight:900;letter-spacing:-.045em;color:var(--text);line-height:1.05;margin-bottom:1rem}
.idx-hero h1 em{font-style:normal;background:linear-gradient(120deg,var(--c-alt),var(--c-vin));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.idx-hero p{font-size:clamp(1.1rem,2.4vw,1.35rem);color:var(--muted);max-width:640px;margin:0 auto 1.8rem}
.idx-actions{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}

.idx-body{max-width:var(--max);margin:0 auto;padding:clamp(2rem,4vw,3.2rem) var(--pad)}
.cluster{margin:0 0 3.4rem}
.cluster-h{display:flex;align-items:center;gap:.9rem;margin-bottom:1.4rem}
.cluster-ic{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;flex-shrink:0;
  background:color-mix(in oklch,var(--theme) 20%,transparent);border:1px solid color-mix(in oklch,var(--theme) 42%,transparent);color:var(--theme)}
.cluster-ic svg{width:24px;height:24px}
.cluster-h h2{font-size:clamp(1.3rem,3vw,1.7rem);font-weight:800;letter-spacing:-.02em;color:var(--text)}
.cluster-h .tier{display:block;font-size:.82rem;color:var(--faint);font-weight:500;text-transform:none;letter-spacing:0}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:1.3rem}
.card{position:relative;display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--border);border-radius:16px;overflow:hidden;
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease)}
.card:hover{border-color:color-mix(in oklch,var(--theme) 55%,transparent);transform:translateY(-4px);
  box-shadow:0 18px 40px var(--shadow-color);text-decoration:none}
.card-cover{height:96px;position:relative;overflow:hidden;display:grid;place-items:center;
  background:linear-gradient(135deg,color-mix(in oklch,var(--theme) 32%,var(--surface)),var(--surface2))}
.card-cover::after{content:'';position:absolute;inset:0;opacity:.45;
  background-image:linear-gradient(color-mix(in oklab, var(--text) 7%, transparent) 1px,transparent 1px),linear-gradient(90deg,color-mix(in oklab, var(--text) 7%, transparent) 1px,transparent 1px);
  background-size:22px 22px}
.card-cover svg{position:relative;width:40px;height:40px;color:var(--theme);
  filter:drop-shadow(0 4px 12px color-mix(in oklch,var(--theme) 50%,transparent))}
.card-body{padding:1.2rem 1.3rem 1.4rem;display:flex;flex-direction:column;flex:1}
.card-body h3{font-size:1.08rem;font-weight:800;color:var(--text);margin-bottom:.45rem;line-height:1.3}
.card-body p{font-size:.9rem;color:var(--muted);line-height:1.55;flex:1}
.card-kw{display:inline-flex;align-items:center;gap:.4rem;margin-top:.9rem;font-size:.78rem;color:var(--theme);font-weight:700}
.card-kw::after{content:'→';transition:transform .2s}
.card:hover .card-kw::after{transform:translateX(4px)}

/* ---------- Footer ---------- */
.footer-shell{border-top:1px solid var(--border);margin-top:3rem;background:var(--bg-2)}
.footer-in{max-width:var(--max);margin:0 auto;padding:2.8rem var(--pad)}
.f-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:2rem;margin-bottom:1.6rem}
.f-logo{font-size:1.1rem;font-weight:800;letter-spacing:-.03em;margin-bottom:.5rem}
.f-logo .fr{color:var(--accent)}.f-logo .fh{color:var(--faint);font-weight:400}
.f-tagline{color:var(--muted);font-size:.92rem;max-width:300px}
.f-links{display:flex;gap:2.8rem;flex-wrap:wrap}
.f-col h4{font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--faint);margin-bottom:.8rem}
.f-col a{display:block;color:var(--muted);font-size:.92rem;padding:.25rem 0}
.f-col a:hover{color:var(--text)}
.f-btm{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;font-size:.84rem;color:var(--faint);
  padding-top:1.4rem;border-top:1px solid var(--border)}
.f-btm a{color:var(--muted)}
.f-legal{font-size:.74rem;color:var(--faint);margin-top:1rem;line-height:1.6}

/* ============================================================
   High-end polish (refactoring-ui + high-end-visual-design)
   ============================================================ */
.reveal{will-change:opacity,transform}

/* Button-in-button: nested circular trailing icon */
.btn{display:inline-flex;align-items:center;gap:.6rem;transition:transform .35s cubic-bezier(0.32,0.72,0,1),filter .25s,box-shadow .35s}
.btn:active{transform:scale(.98)}
.btn-ic{width:1.55rem;height:1.55rem;border-radius:999px;display:inline-grid;place-items:center;
  background:rgba(0,0,0,.16);font-size:.9rem;line-height:1;transition:transform .35s cubic-bezier(0.32,0.72,0,1)}
.btn-ghost .btn-ic{background:color-mix(in oklch,var(--theme) 22%,transparent)}
.btn:hover .btn-ic{transform:translate(3px,-1px) scale(1.06)}

/* Double-bezel: inner highlight + concentric radii on premium surfaces */
.card,.side-card,.cta-box{box-shadow:inset 0 1px 0 color-mix(in oklab, white 6%, transparent), 0 1px 0 var(--shadow-color)}
.card{border-radius:20px}
.side-card{border-radius:18px}
.cta-box{border-radius:22px}
.cta-box::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  box-shadow:inset 0 1px 1px color-mix(in oklab, white 12%, transparent)}
.card:hover{box-shadow:inset 0 1px 0 color-mix(in oklab, white 9%, transparent), 0 18px 44px var(--shadow-color)}

/* Macro-whitespace + sharper hierarchy on the reading column */
.post-main h2{margin-top:3rem}
.post-main > .reveal:first-child h2{margin-top:1.4rem}
.lede,.hero-lede{text-wrap:balance}
.post-main p,.post-main li{max-width:68ch}

/* Index: lift section rhythm */
.cluster{margin-bottom:4rem}
.idx-hero h1{text-wrap:balance}