/* ============================================================
   Duct Designer — shared styles for content pages (DARK MODE)
   (Support, Privacy Policy, Terms of Service)
   The homepage (index.html) has its own self-contained styles.
   ============================================================ */

:root{
  --bg:#0d1117;
  --bg-2:#111823;
  --surface:#161d28;
  --surface-2:#1c2532;
  --text:#eef2f7;
  --text-2:#abb5c2;
  --text-3:#7b8695;
  --line:#28313d;
  --line-2:#333e4c;
  --blue:#4d9bff;
  --blue-2:#2f6fd6;
  --blue-deep:#1e4f9c;
  --blue-tint:rgba(77,155,255,.12);
  --amber:#e0952f;
  --radius:12px;
  --maxw:820px;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 34px rgba(0,0,0,.4);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{display:block;max-width:100%}
h1,h2,h3{line-height:1.2;letter-spacing:-.015em;margin:0}
p{margin:0}

.wrap{max-width:1120px;margin:0 auto;padding:0 24px}

/* ---------- Header ---------- */
header{position:sticky;top:0;z-index:50;background:rgba(13,17,23,.82);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:11px}
.brand:hover{text-decoration:none}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{font-size:15px;color:var(--text-2);font-weight:500;text-decoration:none}
.nav-links a:hover{color:var(--text)}
.nav-cta{display:inline-flex;align-items:center;gap:8px;background:#fff;color:#0d1117!important;font-weight:600;font-size:14px;padding:9px 15px;border-radius:9px}
.nav-cta:hover{background:#e9eef5;text-decoration:none}
.nav-cta svg{width:16px;height:16px}
@media (max-width:720px){.nav-links a:not(.nav-cta){display:none}}

/* ---------- Page hero ---------- */
.page-hero{position:relative;overflow:hidden;background:radial-gradient(120% 90% at 85% -20%,rgba(77,155,255,.10),transparent 60%),linear-gradient(180deg,#0f1620,#0d1117);border-bottom:1px solid var(--line)}
.page-hero .grid-bg{position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(120,165,230,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(120,165,230,.07) 1px,transparent 1px);
  background-size:28px 28px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.85),rgba(0,0,0,0) 92%);mask-image:linear-gradient(180deg,rgba(0,0,0,.85),rgba(0,0,0,0) 92%)}
.page-hero-inner{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto;padding:64px 24px 46px}
.crumb{font-size:13px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--blue);margin-bottom:14px}
.page-hero h1{font-size:clamp(30px,4.6vw,46px);font-weight:800;letter-spacing:-.03em;color:var(--text)}
.page-hero .sub{margin-top:14px;font-size:18px;color:var(--text-2);max-width:36em}
.updated{margin-top:18px;font-size:13.5px;color:var(--text-3)}

/* ---------- Content / prose ---------- */
.content{max-width:var(--maxw);margin:0 auto;padding:52px 24px 30px}
.content h2{font-size:22px;font-weight:800;color:var(--text);margin:40px 0 12px}
.content h2:first-child{margin-top:0}
.content h3{font-size:17px;font-weight:700;color:var(--text);margin:26px 0 8px}
.content p{font-size:16.5px;color:var(--text-2);margin:0 0 16px}
.content ul{margin:0 0 16px;padding-left:22px}
.content li{font-size:16.5px;color:var(--text-2);margin-bottom:8px}
.content strong{color:var(--text)}
.lead{font-size:18px!important;color:var(--text-2)!important}

/* Callout box */
.callout{background:var(--blue-tint);border:1px solid rgba(77,155,255,.28);border-left:3px solid var(--blue);border-radius:10px;padding:18px 20px;margin:22px 0}
.callout p{margin:0;font-size:15.5px;color:var(--text)}
.callout.warn{background:rgba(224,149,47,.12);border-color:rgba(224,149,47,.35);border-left-color:var(--amber)}

/* Support cards */
.help-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:8px 0 20px}
.help-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.help-card .hi{width:42px;height:42px;border-radius:10px;background:var(--blue-tint);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.help-card .hi svg{width:22px;height:22px;color:var(--blue)}
.help-card h3{margin:0 0 6px;font-size:17px;color:var(--text)}
.help-card p{margin:0;font-size:14.5px;color:var(--text-2)}
.help-card a{font-weight:600}
@media (max-width:600px){.help-grid{grid-template-columns:1fr}}

/* FAQ */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:4px 0}
.faq summary{cursor:pointer;list-style:none;padding:16px 2px;font-size:16.5px;font-weight:600;color:var(--text);display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:20px;color:var(--blue);font-weight:400}
.faq details[open] summary::after{content:"\2212"}
.faq details p{padding:0 2px 18px;margin:0;font-size:15.5px;color:var(--text-2)}

.email-btn{display:inline-flex;align-items:center;gap:9px;background:var(--blue);color:#08111f!important;font-weight:700;font-size:15px;padding:12px 20px;border-radius:10px;margin-top:6px}
.email-btn:hover{background:#6aacff;text-decoration:none}
.email-btn svg{width:18px;height:18px}

/* ---------- Footer ---------- */
footer{background:#090d13;color:var(--text-2);padding:52px 0 28px;margin-top:60px;border-top:1px solid var(--line)}
.foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding-bottom:36px;border-bottom:1px solid var(--line)}
.foot-brand{display:flex;align-items:center;gap:11px}
.foot-about{margin-top:16px;font-size:14px;color:var(--text-3);max-width:30em}
.foot-col h4{font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--text-3);margin:0 0 16px}
.foot-col a{display:block;font-size:14.5px;color:var(--text-2)!important;margin-bottom:11px;text-decoration:none}
.foot-col a:hover{color:var(--text)!important}
.foot-bottom{padding-top:24px;display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--text-3)}
.foot-bottom a{color:var(--text-3)!important}
@media (max-width:720px){.foot-top{grid-template-columns:1fr 1fr}.foot-brand-col{grid-column:1/-1}}
@media (max-width:520px){.foot-top{grid-template-columns:1fr}}

/* Duct-fitting wordmark logo */
.brand .logo-mark{height:30px;width:auto;display:block}
.foot-brand .logo-mark-foot{height:26px;width:auto;display:block}

/* DuctPrint text wordmark */
.brand-text{font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--text);line-height:1;display:inline-block}
.brand-text .accent{color:var(--blue)}
.foot-brand .brand-text{font-size:19px}