/* ========================================================================
   Concrete Filler — design system
   Fonts: Space Grotesk (display), Inter (body)
   ===================================================================== */
:root{
  --ink:#15181d;
  --ink-2:#2a2e36;
  --bg:#f5f5f3;
  --surface:#ffffff;
  --muted:#6b7280;
  --line:#e6e6e2;
  --accent:#e8590c;
  --accent-dark:#c2410c;
  --accent-soft:#fff1e8;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(20,24,29,.04),0 8px 24px rgba(20,24,29,.06);
  --shadow-lg:0 24px 60px rgba(20,24,29,.14);
  --wrap:1140px;
  --font:"Inter",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --display:"Space Grotesk",var(--font);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1{overflow-wrap:break-word}
h1,h2,h3,h4{font-family:var(--display);line-height:1.15;font-weight:700;margin:0 0 .5em}
a{color:var(--accent-dark);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* buttons */
.btn{
  display:inline-block;background:var(--accent);color:#fff;font-weight:600;
  padding:13px 24px;border-radius:999px;border:0;cursor:pointer;font-size:16px;
  font-family:var(--font);transition:transform .12s ease,background .15s ease;
}
.btn:hover{background:var(--accent-dark);text-decoration:none;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.eyebrow{
  display:inline-block;font-family:var(--font);font-weight:600;font-size:13px;
  letter-spacing:.08em;text-transform:uppercase;color:var(--accent-dark);margin-bottom:14px;
}

/* ---------- header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-size:21px;font-weight:700;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{width:26px;height:26px;border-radius:7px;background:linear-gradient(135deg,var(--accent),#f59e0b)}
.brand-text strong{color:var(--accent-dark);font-weight:700}
.site-nav{display:flex;align-items:center;gap:26px}
.site-nav a{color:var(--ink);font-weight:500;font-size:15.5px}
.site-nav a:hover{color:var(--accent-dark);text-decoration:none}
.nav-cta{background:var(--ink);color:#fff!important;padding:9px 18px;border-radius:999px}
.nav-cta:hover{background:var(--accent-dark)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:0;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- hero ---------- */
.hero{background:linear-gradient(180deg,#fff,var(--bg));padding:64px 0 40px}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-copy,.hero-feature{min-width:0}
.hero-copy h1{font-size:clamp(38px,5vw,60px);letter-spacing:-.02em;margin-bottom:18px}
.hero-copy p{font-size:19px;color:var(--muted);max-width:30em;margin:0 0 28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-feature{
  position:relative;min-height:340px;border-radius:var(--radius);background-size:cover;
  background-position:center;display:flex;flex-direction:column;justify-content:flex-end;
  padding:28px;color:#fff;box-shadow:var(--shadow-lg);overflow:hidden;
}
.hero-feature:hover{text-decoration:none}
.hero-feature h2{color:#fff;font-size:26px;margin:0;max-width:14em}
.hero-feature-tag{
  align-self:flex-start;background:var(--accent);color:#fff;font-size:12px;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;padding:6px 12px;border-radius:999px;margin-bottom:auto;
}

/* ---------- sections ---------- */
.section{padding:64px 0}
.section-alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:32px;flex-wrap:wrap;gap:12px}
.section-head h2{font-size:30px;margin:0}
.section-head a{font-weight:600}

/* topic grid */
.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.topic-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px;display:flex;flex-direction:column;transition:transform .14s,box-shadow .14s,border-color .14s;
}
.topic-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--accent);text-decoration:none}
.topic-card h3{font-size:19px;margin-bottom:8px;color:var(--ink)}
.topic-card p{color:var(--muted);font-size:14.5px;margin:0 0 16px;flex:1}
.topic-count{color:var(--accent-dark);font-weight:600;font-size:14px}

/* ---------- card grid ---------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;transition:transform .14s,box-shadow .14s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.card-media{display:block;height:180px;background-size:cover;background-position:center;background-color:var(--ink-2)}
.card-body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.card-cat{font-size:12px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-dark);margin-bottom:10px}
.card-cat:hover{text-decoration:none}
.card-body h3{font-size:19px;margin:0 0 10px;line-height:1.25}
.card-body h3 a{color:var(--ink)}
.card-body h3 a:hover{color:var(--accent-dark);text-decoration:none}
.card-body p{color:var(--muted);font-size:14.5px;margin:0 0 16px;flex:1}
.card-meta{color:#9aa0aa;font-size:13px;font-weight:500}

/* ---------- page hero (interior) ---------- */
.page-hero{background:var(--ink);color:#fff;padding:72px 0 60px}
.page-hero .eyebrow{color:#f59e0b}
.page-hero h1{font-size:clamp(32px,4.5vw,48px);letter-spacing:-.02em;margin-bottom:14px}
.page-hero p{color:#b8bcc4;font-size:18px;max-width:38em;margin:0}
.page-hero a{color:#fff;text-decoration:underline}
.error-hero{padding:110px 0}
.error-hero .hero-actions{margin-top:26px}
.error-hero a.btn{text-decoration:none}

/* ---------- article ---------- */
.article-hero{
  background-size:cover;background-position:center;color:#fff;
  padding:96px 0 56px;display:flex;align-items:flex-end;min-height:420px;
}
.article-hero .eyebrow{color:#ffb070;text-decoration:none}
.article-hero h1{font-size:clamp(32px,4.6vw,52px);max-width:18em;letter-spacing:-.02em;margin-bottom:18px}
.article-meta{display:flex;gap:10px;flex-wrap:wrap;color:#d6d9de;font-size:15px;font-weight:500}
.article-wrap{padding:56px 24px}
.article-body{max-width:720px;margin:0 auto;font-size:18.5px}
.article-body p{margin:0 0 1.35em}
.article-body h2{font-size:28px;margin:1.8em 0 .6em}
.article-body h3{font-size:22px;margin:1.6em 0 .5em}
.article-body ul,.article-body ol{margin:0 0 1.35em;padding-left:1.3em}
.article-body li{margin:.4em 0}
.article-body a{text-decoration:underline;text-underline-offset:2px}
.article-body img{border-radius:var(--radius-sm);margin:1.5em 0}
.article-cta{
  margin:48px 0 0;padding:32px;background:var(--accent-soft);border:1px solid #fbd9c2;
  border-radius:var(--radius);text-align:center;
}
.article-cta h3{font-size:22px;margin-bottom:6px}
.article-cta p{color:var(--ink-2);margin:0 0 18px;font-size:16px}
.article-cta .btn{text-decoration:none}

.related{background:var(--surface);border-top:1px solid var(--line);padding:56px 0}
.related h2{font-size:26px;margin-bottom:28px}

/* ---------- prose (about/privacy) ---------- */
.prose{max-width:740px;font-size:18px}
.prose h2{font-size:26px;margin:1.6em 0 .5em}
.prose p{margin:0 0 1.2em;color:var(--ink-2)}
.prose a{text-decoration:underline}

/* ---------- contact ---------- */
.contact-wrap{display:grid;grid-template-columns:1.4fr .8fr;gap:48px;align-items:start}
.contact-form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.field{margin-bottom:20px;display:flex;flex-direction:column}
.field label{font-weight:600;font-size:14.5px;margin-bottom:7px}
.field input,.field textarea{
  font-family:var(--font);font-size:16px;padding:12px 14px;border:1px solid var(--line);
  border-radius:var(--radius-sm);background:#fafafa;color:var(--ink);
}
.field input:focus,.field textarea:focus{outline:2px solid var(--accent);border-color:var(--accent);background:#fff}
.contact-aside h3{font-size:17px;margin:0 0 8px}
.contact-aside h3:not(:first-child){margin-top:28px}
.contact-aside ul{padding-left:18px;margin:0;color:var(--muted)}
.contact-aside li{margin:.4em 0}

/* ---------- forms / web3 ---------- */
.form-note{font-size:14.5px;margin:14px 0 0;min-height:1px}
.form-note.ok{color:#0f766e;font-weight:600}
.form-note.err{color:#b91c1c;font-weight:600}

/* newsletter */
.newsletter .nl-label{display:block;font-weight:500;margin-bottom:10px}
.newsletter .nl-row{display:flex;gap:8px}
.newsletter input[type=email]{
  flex:1;font-family:var(--font);font-size:15px;padding:11px 14px;border:1px solid var(--line);
  border-radius:999px;background:#fff;color:var(--ink);min-width:0;
}
.newsletter input[type=email]:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.newsletter button{
  background:var(--accent);color:#fff;border:0;font-weight:600;padding:11px 22px;border-radius:999px;
  cursor:pointer;font-family:var(--font);font-size:15px;white-space:nowrap;
}
.newsletter button:hover{background:var(--accent-dark)}

/* cta band */
.cta-band{background:var(--ink);color:#fff;padding:64px 0;text-align:center}
.cta-band h2{font-size:30px;margin-bottom:24px}
.cta-band .newsletter{max-width:480px;margin:0 auto}
.cta-band .nl-label{color:#b8bcc4}
.cta-band .form-note.ok{color:#5eead4}

/* ---------- footer ---------- */
.site-footer{background:#0f1115;color:#aeb3bb;padding:56px 0 28px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.6fr;gap:36px}
.footer-brand .brand-text{font-family:var(--display);font-size:22px;font-weight:700;color:#fff}
.footer-brand .brand-text strong{color:var(--accent)}
.footer-brand p{font-size:14.5px;margin:12px 0 0;max-width:24em}
.footer-contact a{color:#fff}
.footer-col h4{color:#fff;font-size:14px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:14px}
.footer-col ul{list-style:none;padding:0;margin:0}
.footer-col li{margin:.5em 0}
.footer-col a{color:#aeb3bb;font-size:14.5px}
.footer-col a:hover{color:#fff}
.footer-news .newsletter .nl-row{flex-direction:column}
.footer-news input[type=email]{border-radius:var(--radius-sm)}
.footer-news button{border-radius:var(--radius-sm)}
.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid #23262d;margin-top:40px;padding-top:22px;font-size:13.5px;flex-wrap:wrap;gap:8px}
.footer-bottom a{color:#aeb3bb}
.footer-bottom a:hover{color:#fff}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:32px}
  .hero-feature{min-height:260px}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .contact-wrap{grid-template-columns:1fr}
}
@media(max-width:680px){
  body{font-size:16px}
  .nav-toggle{display:flex}
  .site-nav{
    position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 0;display:none;box-shadow:var(--shadow);
  }
  .site-nav.open{display:flex}
  .site-nav a{padding:13px 24px}
  .nav-cta{margin:8px 24px;text-align:center}
  .card-grid{grid-template-columns:1fr}
  .topic-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .article-hero{padding:72px 0 40px;min-height:320px}
  .section,.cta-band{padding:48px 0}
  .hero-copy h1{font-size:clamp(32px,8.5vw,42px)}
  .hero{padding:40px 0 32px}
}