/* ======================================================================
   AvantiGroup.AI — Blog stylesheet
   ----------------------------------------------------------------------
   Self-contained design system for everything under /blog/. The tokens,
   fonts, nav, brand-mark and footer are lifted verbatim from
   public/index.html so the blog reads as the same site without depending
   on (or rebuilding) the 250 KB marketing page.

   Theme + accent are read from the SAME localStorage keys the main site
   writes — `avanti-theme` (light|dark) and `avanti-accent-v2` (one of the
   five palettes) — by the tiny inline script in each blog HTML page, so a
   visitor's chosen palette carries across to the blog. Defaults: dark +
   tangerine.
   ====================================================================== */

/* =============== BASE THEME (light/dark surfaces) =============== */
:root[data-theme="dark"]{
  --bg:#0A0A0C; --bg-soft:#111115; --bg-panel:#16161B; --bg-panel-2:#1C1C22;
  --ink:#F6F6F4; --ink-muted:#9A9A96; --ink-faint:#5A5A58;
  --line:rgba(255,255,255,0.08); --line-strong:rgba(255,255,255,0.16);
  --surface-shadow:0 20px 60px rgba(0,0,0,0.5);
}
:root[data-theme="light"]{
  --bg:#F6F5F1; --bg-soft:#EFEEE9; --bg-panel:#FFFFFF; --bg-panel-2:#FAFAF7;
  --ink:#0A0A0C; --ink-muted:#5A5A58; --ink-faint:#9A9A96;
  --line:rgba(10,10,12,0.08); --line-strong:rgba(10,10,12,0.16);
  --surface-shadow:0 20px 60px rgba(20,20,30,0.08);
}

/* =============== ACCENT PALETTES (5 options × 2 themes) =============== */
:root[data-theme="dark"][data-accent="cobalt"]{ --accent:#4F7FFF; --accent-soft:#83A3FF; --accent-glow:rgba(79,127,255,0.35); --accent-ink:#FFFFFF; }
:root[data-theme="light"][data-accent="cobalt"]{ --accent:#2F5BFF; --accent-soft:#5C7FFF; --accent-glow:rgba(47,91,255,0.25); --accent-ink:#FFFFFF; }
:root[data-theme="dark"][data-accent="azure"]{ --accent:#38BDF8; --accent-soft:#7DD3FC; --accent-glow:rgba(56,189,248,0.35); --accent-ink:#04172B; }
:root[data-theme="light"][data-accent="azure"]{ --accent:#0284C7; --accent-soft:#38BDF8; --accent-glow:rgba(2,132,199,0.25); --accent-ink:#FFFFFF; }
:root[data-theme="dark"][data-accent="tangerine"]{ --accent:#FF7A3D; --accent-soft:#FFA570; --accent-glow:rgba(255,122,61,0.32); --accent-ink:#1A0A03; }
:root[data-theme="light"][data-accent="tangerine"]{ --accent:#EA580C; --accent-soft:#FB7C2E; --accent-glow:rgba(234,88,12,0.25); --accent-ink:#FFFFFF; }
:root[data-theme="dark"][data-accent="emerald"]{ --accent:#34D399; --accent-soft:#6EE7B7; --accent-glow:rgba(52,211,153,0.32); --accent-ink:#03150C; }
:root[data-theme="light"][data-accent="emerald"]{ --accent:#059669; --accent-soft:#10B981; --accent-glow:rgba(5,150,105,0.25); --accent-ink:#FFFFFF; }
:root[data-theme="dark"][data-accent="lime"]{ --accent:#CDFF4D; --accent-soft:#DEFF7A; --accent-glow:rgba(205,255,77,0.35); --accent-ink:#0E1A00; }
:root[data-theme="light"][data-accent="lime"]{ --accent:#65A30D; --accent-soft:#84CC16; --accent-glow:rgba(101,163,13,0.22); --accent-ink:#FFFFFF; }

:root{
  --display:"Space Grotesk",-apple-system,system-ui,sans-serif;
  --body:"Inter",-apple-system,system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
  --ease:cubic-bezier(.2,.85,.2,1);
}

/* =============== RESET / BASE =============== */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;overflow-x:clip}
body{
  background:var(--bg); color:var(--ink);
  font-family:var(--body); font-weight:400; line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:clip;
  transition:background .5s var(--ease), color .5s var(--ease);
}
:root[data-theme="dark"] body{background:#020308}
::selection{background:var(--accent);color:var(--accent-ink)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

.container{max-width:1100px;margin:0 auto;padding:0 36px;position:relative;z-index:1}
@media (max-width:720px){.container{padding:0 22px}}

/* =============== NAV (mirrors main site) =============== */
nav.top{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:18px 36px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  transition:padding .4s var(--ease), background .4s var(--ease);
}
nav.top.scrolled{
  padding:12px 36px;
  background:color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.brand{
  display:flex;align-items:center;gap:12px;
  font-family:var(--display);font-weight:400;font-size:17px;letter-spacing:-0.01em;
}
.brand-mark{position:relative;width:28px;height:28px;display:grid;place-items:center}
.brand-mark::before,.brand-mark::after{
  content:"";position:absolute;width:12px;height:12px;
  border-top:3px solid var(--ink);border-right:3px solid var(--ink);
  transform:rotate(45deg) translate(-4px,4px);
  transition:all .5s var(--ease);border-radius:1px;
}
.brand-mark::after{
  border-color:var(--accent);transform:rotate(45deg) translate(0,0);opacity:.5;
  animation:brand-echo 8.5s ease-in-out infinite;
}
@keyframes brand-echo{
  0%,100%{opacity:.32;transform:rotate(45deg) translate(0,0)}
  50%{opacity:.6;transform:rotate(45deg) translate(2px,-2px)}
}
@media (prefers-reduced-motion: reduce){
  .brand-mark::after{animation:none;opacity:.5;transform:rotate(45deg) translate(0,0)}
}
.brand:hover .brand-mark::before{transform:rotate(45deg) translate(-2px,2px);border-color:var(--accent)}
.brand em{font-style:normal;color:var(--accent);margin-left:-2px}

/* Center nav — premium underline indicators */
.nav-center{display:flex;align-items:center;gap:2px}
.nav-center a{
  position:relative;margin:0 6px;padding:8px 2px;
  font-size:13px;font-weight:500;letter-spacing:.01em;
  color:var(--ink-muted);transition:color .3s var(--ease);
}
.nav-center a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;border-radius:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:center;opacity:0;
  transition:transform .35s var(--ease), opacity .35s var(--ease);
}
.nav-center a:hover{color:var(--ink)}
.nav-center a:hover::after{transform:scaleX(.55);opacity:.55}
.nav-center a.active{color:var(--accent)}
.nav-center a.active::after{transform:scaleX(1);opacity:1}

.nav-right{display:flex;align-items:center;gap:8px;position:relative}

/* Theme toggle — compact borderless monochrome icon */
.theme-toggle{
  width:36px;height:36px;border:none;background:none;border-radius:9px;
  cursor:pointer;padding:0;display:grid;place-items:center;
  color:var(--ink-muted);transition:color .25s var(--ease), background .25s var(--ease);
  flex-shrink:0;
}
.theme-toggle:hover{color:var(--ink);background:color-mix(in srgb, var(--ink) 7%, transparent)}
.theme-toggle svg{grid-area:1/1;width:17px;height:17px;transition:opacity .35s var(--ease), transform .45s var(--ease)}
.theme-toggle .moon{opacity:1;transform:rotate(0) scale(1)}
.theme-toggle .sun{opacity:0;transform:rotate(-90deg) scale(.6)}
:root[data-theme="light"] .theme-toggle .moon{opacity:0;transform:rotate(90deg) scale(.6)}
:root[data-theme="light"] .theme-toggle .sun{opacity:1;transform:rotate(0) scale(1)}

.nav-divider{width:1px;height:22px;background:var(--line-strong);margin:0 4px;flex-shrink:0}

.cta-btn{
  display:inline-flex;align-items:center;gap:9px;
  height:38px;padding:0 18px;border-radius:11px;
  font-family:var(--body);font-size:13px;font-weight:500;letter-spacing:.01em;
  background:var(--ink);color:var(--bg);
  transition:background .3s var(--ease), color .3s var(--ease), transform .3s var(--ease);
}
.cta-btn:hover{background:var(--accent);color:var(--accent-ink);transform:translateY(-1px)}
.cta-btn .cta-arrow{width:14px;height:14px;flex-shrink:0;transition:transform .3s var(--ease)}
.cta-btn:hover .cta-arrow{transform:translate(2px,-2px)}

/* Mobile menu (≤900px): hamburger + glass dropdown */
.nav-toggle{display:none}
.nav-cta-mobile{display:none}
@media(max-width:900px){
  .nav-toggle{
    display:grid;place-items:center;width:36px;height:36px;padding:0;
    border:none;background:none;border-radius:9px;color:var(--ink-muted);cursor:pointer;
    transition:color .25s var(--ease), background .25s var(--ease);
  }
  .nav-toggle:hover{color:var(--ink);background:color-mix(in srgb, var(--ink) 7%, transparent)}
  .nav-toggle .bar{display:block;width:17px;height:2px;border-radius:2px;background:currentColor;transition:transform .35s var(--ease), opacity .2s var(--ease)}
  .nav-toggle .bar + .bar{margin-top:4px}
  #topNav.nav-open .nav-toggle .bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
  #topNav.nav-open .nav-toggle .bar:nth-child(2){opacity:0}
  #topNav.nav-open .nav-toggle .bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

  .nav-center{
    position:absolute;top:calc(100% + 10px);right:0;left:auto;
    flex-direction:column;align-items:stretch;gap:2px;min-width:248px;padding:12px;
    border-radius:18px;border:1px solid var(--line-strong);
    background:color-mix(in srgb, var(--bg-panel) 94%, transparent);
    backdrop-filter:blur(20px) saturate(140%);-webkit-backdrop-filter:blur(20px) saturate(140%);
    box-shadow:var(--surface-shadow);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .3s var(--ease), transform .3s var(--ease), visibility 0s linear .3s;
  }
  #topNav.nav-open .nav-center{
    opacity:1;visibility:visible;transform:translateY(0);
    transition:opacity .3s var(--ease), transform .3s var(--ease), visibility 0s linear 0s;
  }
  .nav-center a{margin:0;padding:11px 14px;border-radius:11px;font-size:14px}
  .nav-center a::after{display:none}
  .nav-center a:hover,.nav-center a.active{color:var(--ink);background:color-mix(in srgb, var(--ink) 8%, transparent)}
  :root[data-theme="light"] .nav-center a.active{color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent)}
  .nav-cta-mobile{
    display:flex;align-items:center;justify-content:center;gap:8px;
    margin-top:8px;padding:12px 14px;border-radius:11px;
    background:var(--ink);color:var(--bg);font-size:14px;font-weight:500;
    transition:background .3s var(--ease), color .3s var(--ease);
  }
  .nav-cta-mobile:hover{background:var(--accent);color:var(--accent-ink)}
  .nav-cta-mobile .cta-arrow{width:14px;height:14px;flex-shrink:0}
  .nav-right > .cta-btn{display:none}
  .nav-divider{display:none}
}

/* =============== BLOG INDEX — HEADER =============== */
.blog-hero{padding:160px 0 56px}
.blog-eyebrow{
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);margin-bottom:20px;display:inline-flex;align-items:center;gap:10px;
}
.blog-eyebrow::before{content:"";width:28px;height:1px;background:var(--accent);display:inline-block}
.blog-hero h1{
  font-family:var(--display);font-weight:500;letter-spacing:-0.03em;line-height:1.04;
  font-size:clamp(38px,6vw,68px);
}
.blog-hero h1 em{font-style:normal;color:var(--accent)}
.blog-hero p{
  margin-top:22px;max-width:60ch;font-size:17px;line-height:1.7;color:var(--ink-muted);
}

/* =============== POST CARD GRID =============== */
.post-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));
  gap:24px;padding:24px 0 120px;
}
.post-card{
  display:flex;flex-direction:column;gap:16px;
  padding:30px;border-radius:20px;
  border:1px solid var(--line);background:var(--bg-panel);
  box-shadow:var(--surface-shadow);
  transition:transform .45s var(--ease), border-color .35s var(--ease), box-shadow .5s var(--ease);
}
.post-card:hover{transform:translateY(-4px);border-color:var(--line-strong)}
.post-card .meta{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-faint);
}
.post-card .meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-faint)}
.post-card h2{
  font-family:var(--display);font-weight:500;font-size:23px;line-height:1.22;letter-spacing:-0.01em;
  transition:color .3s var(--ease);
}
.post-card:hover h2{color:var(--accent)}
.post-card .excerpt{font-size:15px;line-height:1.65;color:var(--ink-muted);flex:1}
.tag-row{display:flex;gap:8px;flex-wrap:wrap}
.tag{
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;
  padding:5px 11px;border-radius:999px;
  border:1px solid var(--line-strong);color:var(--ink-muted);
}
.post-card .read{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:500;color:var(--accent);margin-top:2px;
}
.post-card .read svg{width:14px;height:14px;transition:transform .3s var(--ease)}
.post-card:hover .read svg{transform:translate(3px,-3px)}

.blog-empty{
  padding:60px 0 140px;color:var(--ink-muted);font-size:16px;
}

/* =============== ARTICLE (single post) =============== */
.article-wrap{max-width:760px;margin:0 auto;padding:150px 36px 100px;position:relative;z-index:1}
@media (max-width:720px){.article-wrap{padding:130px 22px 80px}}
.back-link{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-faint);margin-bottom:34px;transition:color .3s var(--ease);
}
.back-link:hover{color:var(--accent)}
.back-link svg{width:13px;height:13px}
.article-head .meta{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-faint);margin-bottom:18px;
}
.article-head .meta .dot{width:3px;height:3px;border-radius:50%;background:var(--ink-faint)}
.article-head h1{
  font-family:var(--display);font-weight:500;letter-spacing:-0.025em;line-height:1.08;
  font-size:clamp(30px,5vw,48px);
}
.article-head .standfirst{
  margin-top:22px;font-size:19px;line-height:1.7;color:var(--ink-muted);
  padding-bottom:34px;border-bottom:1px solid var(--line);
}

.article-body{font-size:17px;line-height:1.8;color:var(--ink)}
.article-body > * + *{margin-top:24px}
.article-body h2{
  font-family:var(--display);font-weight:500;font-size:27px;line-height:1.25;letter-spacing:-0.01em;
  margin-top:52px;
}
.article-body h3{
  font-family:var(--display);font-weight:500;font-size:20px;line-height:1.3;
  margin-top:38px;
}
.article-body a{color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent-glow);transition:border-color .3s var(--ease)}
.article-body a:hover{border-bottom-color:var(--accent)}
.article-body strong{color:var(--ink);font-weight:600}
.article-body ul,.article-body ol{padding-left:24px;display:flex;flex-direction:column;gap:10px}
.article-body li{line-height:1.7}
.article-body li::marker{color:var(--accent)}
.article-body blockquote{
  border-left:3px solid var(--accent);padding:6px 0 6px 22px;
  color:var(--ink-muted);font-style:italic;font-size:18px;
}
.article-body code{
  font-family:var(--mono);font-size:.88em;
  background:var(--bg-panel-2);padding:2px 7px;border-radius:6px;
  border:1px solid var(--line);
}
.article-body pre{
  background:var(--bg-panel-2);border:1px solid var(--line);border-radius:10px;
  padding:14px 16px;margin:24px 0;overflow-x:auto;-webkit-overflow-scrolling:touch;
  font-family:var(--mono);font-size:13.5px;line-height:1.55;
}
.article-body pre code{
  background:none;border:0;padding:0;border-radius:0;
  font-size:inherit;white-space:pre;color:var(--ink);
}
.article-body hr{border:none;border-top:1px solid var(--line);margin:44px 0}

/* Source list at the foot of each digest */
.sources{
  margin-top:64px;padding-top:34px;border-top:1px solid var(--line);
}
.sources h2{
  font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-faint);font-weight:500;margin:0 0 20px;
}
.sources ol{list-style:none;display:flex;flex-direction:column;gap:14px;padding:0;counter-reset:src}
.sources li{
  counter-increment:src;display:flex;gap:14px;align-items:baseline;
  font-size:15px;line-height:1.6;
}
.sources li::before{
  content:counter(src);font-family:var(--mono);font-size:11px;color:var(--accent);
  border:1px solid var(--line-strong);border-radius:50%;
  width:22px;height:22px;display:grid;place-items:center;flex:0 0 22px;
}
.sources a{color:var(--ink);border-bottom:1px solid var(--line-strong);transition:color .3s var(--ease),border-color .3s var(--ease)}
.sources a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.sources .src-host{color:var(--ink-faint);font-family:var(--mono);font-size:12px;margin-left:6px}

/* =============== ARTICLE + KEYWORDS SIDEBAR =============== */
/* Posts with a keyword sidebar widen the wrap and split body/aside into a grid.
   Plain posts (no .has-aside) are untouched and keep the 760px reading column. */
.article-wrap.has-aside{max-width:1080px}
.article-grid{
  display:grid;grid-template-columns:minmax(0,1fr) 244px;gap:64px;
  align-items:start;margin-top:42px;
}
.article-main{min-width:0}
/* keep the body's reading measure comfortable even in the wider grid */
.article-main .article-body{max-width:46rem}
.article-aside{position:sticky;top:116px}

.keywords{
  border-top:1px solid var(--line);padding-top:8px;
}
.keywords > h2{
  font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-faint);font-weight:500;margin:18px 0 4px;
}
.kw-group{margin-top:22px}
.kw-group > h3{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);font-weight:500;margin:0 0 11px;
}
.kw-group ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px}
.kw-group li{
  font-size:12.5px;line-height:1.35;color:var(--ink-muted);
  background:var(--bg-panel-2);border:1px solid var(--line);
  padding:5px 11px;border-radius:999px;transition:border-color .3s var(--ease),color .3s var(--ease);
}
.kw-group li:hover{border-color:var(--accent);color:var(--ink)}

/* sources sit under the body column, aligned to the same measure */
.article-grid .sources{max-width:46rem}

@media (max-width:920px){
  .article-wrap.has-aside{max-width:760px}
  .article-grid{display:flex;flex-direction:column;gap:0;align-items:stretch}
  .article-main .article-body,.article-grid .sources{max-width:none}
  /* show keywords right after the standfirst on narrow screens */
  .article-aside{position:static;order:-1;margin:30px 0 4px}
  .keywords{border-top:none;padding-top:0}
  .keywords > h2{margin-top:0}
}

/* =============== FOOTER (mirrors main site) =============== */
footer{border-top:1px solid var(--line);padding:70px 0 40px;background:var(--bg-soft)}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:48px;margin-bottom:50px}
.footer-brand{
  display:flex;align-items:center;gap:12px;
  font-family:var(--display);font-weight:400;font-size:24px;letter-spacing:-0.02em;margin-bottom:14px;
}
.footer-brand em{font-style:normal;color:var(--accent)}
.footer-tag{font-size:14px;color:var(--ink-muted);line-height:1.65;max-width:36ch}
.footer-col h4{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ink-faint);margin-bottom:22px;font-weight:500;
}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:12px}
.footer-col a{color:var(--ink-muted);font-size:14px;transition:color .3s var(--ease)}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:28px;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--ink-faint);text-transform:uppercase;
}
.footer-bottom em{color:var(--accent);font-style:normal}
.footer-bottom a:hover{color:var(--accent)}
@media(max-width:900px){.footer-top{grid-template-columns:1fr 1fr;gap:40px}}
@media(max-width:560px){
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:14px;text-align:center}
}

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