/* TaxTrace User Guide — shared styles (matches taxtrace.io design system) */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --neon:#CCFF00;
  --neon-dim:rgba(204,255,0,0.12);
  --neon-glow:rgba(204,255,0,0.06);
  --bg:#000000;
  --surface:#0a0a0a;
  --surface-2:#111111;
  --surface-3:#1a1a1a;
  --border:#222222;
  --border-light:#333333;
  --text:#e8e8e8;
  --text-dim:#888888;
  --text-muted:#555555;
  --white:#ffffff;
  --radius:8px;
  --radius-lg:16px;
  --max-w:1200px;
  --sidebar-w:280px;
  --nav-h:64px;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}

/* ── Navigation (matches home) ── */
nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(0,0,0,0.85);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);padding:0 2rem;
}
.nav-inner{
  max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;
  justify-content:space-between;height:var(--nav-h);
}
.nav-brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.nav-brand img{width:32px;height:32px}
.nav-brand span{font-weight:600;font-size:1.1rem;color:var(--white);letter-spacing:-0.02em}
.nav-links{display:flex;gap:2rem;align-items:center}
.nav-links a{
  color:var(--text-dim);text-decoration:none;font-size:0.875rem;
  font-weight:400;transition:color 0.2s;letter-spacing:0.01em;
}
.nav-links a:hover,.nav-links a.active{color:var(--neon)}
.nav-links a.nav-cta{
  color:var(--neon);border:1px solid rgba(204,255,0,0.3);
  padding:6px 16px;border-radius:6px;font-weight:500;transition:all 0.2s;
}
.nav-links a.nav-cta:hover{background:var(--neon-dim);border-color:var(--neon)}

/* ── Layout ── */
.docs{
  max-width:var(--max-w);margin:0 auto;
  padding:calc(var(--nav-h) + 2.5rem) 2rem 4rem;
  display:grid;grid-template-columns:var(--sidebar-w) 1fr;gap:3rem;
  align-items:start;
}

/* ── Sidebar ── */
.sidebar{
  position:sticky;top:calc(var(--nav-h) + 2rem);
  align-self:start;max-height:calc(100vh - var(--nav-h) - 3rem);
  overflow-y:auto;padding-right:0.5rem;
}
.sidebar-title{
  font-size:0.72rem;text-transform:uppercase;letter-spacing:0.12em;
  color:var(--text-muted);font-weight:600;margin:0 0 1rem 0.75rem;
}
.sidebar ol{list-style:none;counter-reset:guide;display:flex;flex-direction:column;gap:2px}
.sidebar li{counter-increment:guide}
.sidebar a{
  display:flex;gap:0.6rem;align-items:baseline;
  padding:8px 12px;border-radius:6px;text-decoration:none;
  color:var(--text-dim);font-size:0.9rem;transition:all 0.15s;
  border:1px solid transparent;
}
.sidebar a::before{
  content:counter(guide,decimal-leading-zero);
  font-family:'JetBrains Mono',monospace;font-size:0.72rem;
  color:var(--text-muted);flex-shrink:0;
}
.sidebar a:hover{background:var(--surface-2);color:var(--text)}
.sidebar a.active{
  background:var(--neon-dim);color:var(--neon);
  border-color:rgba(204,255,0,0.25);
}
.sidebar a.active::before{color:var(--neon)}

/* ── Content / prose ── */
.content{min-width:0;max-width:760px}
.breadcrumb{font-size:0.8rem;color:var(--text-muted);margin-bottom:1.25rem}
.breadcrumb a{color:var(--text-dim);text-decoration:none}
.breadcrumb a:hover{color:var(--neon)}
.eyebrow{
  font-size:0.75rem;text-transform:uppercase;letter-spacing:0.1em;
  color:var(--neon);font-weight:600;margin-bottom:0.75rem;
}
.content h1{
  font-size:clamp(1.9rem,3.5vw,2.6rem);font-weight:700;color:var(--white);
  letter-spacing:-0.03em;line-height:1.15;margin-bottom:1.25rem;
}
.content h2{
  font-size:1.4rem;font-weight:600;color:var(--white);letter-spacing:-0.02em;
  margin:2.5rem 0 1rem;padding-top:1rem;border-top:1px solid var(--border);
}
.content h3{font-size:1.08rem;font-weight:600;color:var(--white);margin:1.75rem 0 0.6rem}
.content p{color:var(--text-dim);margin-bottom:1rem;font-weight:300;font-size:1rem}
.content strong{color:var(--text);font-weight:600}
.content a{color:var(--neon);text-decoration:none;border-bottom:1px solid rgba(204,255,0,0.3)}
.content a:hover{border-bottom-color:var(--neon)}
.content ul,.content ol{margin:0 0 1.25rem 1.25rem;color:var(--text-dim);font-weight:300}
.content li{margin-bottom:0.5rem}
.content li::marker{color:var(--neon)}
.lead{font-size:1.15rem;color:var(--text);font-weight:300;line-height:1.7;margin-bottom:1.5rem}

/* code */
.content code{
  font-family:'JetBrains Mono',monospace;font-size:0.85em;
  background:var(--surface-2);border:1px solid var(--border);
  padding:1px 6px;border-radius:5px;color:var(--neon);
}

/* blockquote / callout */
.content blockquote{
  margin:1.5rem 0;padding:1rem 1.25rem;
  background:var(--surface);border:1px solid var(--border);
  border-left:3px solid var(--neon);border-radius:var(--radius);
}
.content blockquote p{margin:0;color:var(--text)}

/* tables */
.table-wrap{overflow-x:auto;margin:1.5rem 0}
.content table{width:100%;border-collapse:collapse;font-size:0.92rem}
.content th,.content td{
  text-align:left;padding:12px 14px;border-bottom:1px solid var(--border);
  vertical-align:top;
}
.content th{
  color:var(--white);font-weight:600;background:var(--surface);
  font-size:0.82rem;text-transform:uppercase;letter-spacing:0.04em;
}
.content td{color:var(--text-dim);font-weight:300}
.content tr:hover td{background:var(--surface)}

/* checklist */
.checklist{list-style:none;margin-left:0}
.checklist li{display:flex;gap:0.6rem;align-items:flex-start}
.checklist li::before{content:'\2713';color:var(--neon);font-weight:700;flex-shrink:0}

/* ── Prev / next ── */
.pager{
  display:flex;gap:1rem;margin-top:3rem;padding-top:2rem;
  border-top:1px solid var(--border);
}
.pager a{
  flex:1;display:block;padding:1rem 1.25rem;border:1px solid var(--border);
  border-radius:var(--radius);text-decoration:none;transition:all 0.2s;
  background:var(--surface);
}
.pager a:hover{border-color:var(--border-light);background:var(--surface-2)}
.pager .dir{font-size:0.72rem;text-transform:uppercase;letter-spacing:0.08em;color:var(--text-muted)}
.pager .title{color:var(--text);font-weight:500;font-size:0.95rem;margin-top:0.2rem}
.pager .next{text-align:right}

/* disclaimer */
.disclaimer{
  margin-top:2.5rem;padding:1rem 1.25rem;border:1px dashed var(--border-light);
  border-radius:var(--radius);font-size:0.85rem;color:var(--text-muted);
}

/* ── Footer ── */
footer{border-top:1px solid var(--border);padding:2.5rem 2rem}
.footer-inner{
  max-width:var(--max-w);margin:0 auto;display:flex;align-items:center;
  justify-content:space-between;flex-wrap:wrap;gap:1rem;
}
.footer-brand{display:flex;align-items:center;gap:10px}
.footer-brand img{width:24px;height:24px}
.footer-brand span{font-size:0.85rem;color:var(--text-muted)}
.footer-links{display:flex;gap:2rem}
.footer-links a{font-size:0.8rem;color:var(--text-muted);text-decoration:none;transition:color 0.2s}
.footer-links a:hover{color:var(--text-dim)}
.footer-legal{
  max-width:var(--max-w);margin:1.5rem auto 0;padding-top:1.25rem;
  border-top:1px solid var(--border);
  font-size:0.78rem;color:var(--text-muted);line-height:1.6;text-align:center;
}
.footer-legal a{color:var(--text-dim);text-decoration:none;border-bottom:1px solid var(--border-light)}
.footer-legal a:hover{color:var(--neon);border-bottom-color:var(--neon)}

/* mobile sidebar toggle */
.sidebar-toggle{display:none}

@media(max-width:900px){
  .docs{grid-template-columns:1fr;gap:1.5rem}
  .sidebar{
    position:static;max-height:none;overflow:visible;
    border:1px solid var(--border);border-radius:var(--radius);
    padding:1rem;background:var(--surface);
  }
  .nav-links a:not(.nav-cta){display:none}
}
@media(max-width:600px){
  .docs{padding-left:1.25rem;padding-right:1.25rem}
  .pager{flex-direction:column}
  .pager .next{text-align:left}
}