/* ==========================================================================
   TaxBridge — developer-first SaaS theme (a product of The Meta Sum)
   Distinct from the Sum Cloud POS marketing site. Dark hero + clean docs.
   ========================================================================== */
:root{
  --tb-bg:#ffffff;
  --tb-ink:#0f172a;
  --tb-ink-soft:#475569;
  --tb-muted:#64748b;
  --tb-line:#e2e8f0;
  --tb-surface:#f8fafc;
  --tb-surface-2:#f1f5f9;
  --tb-navy:#0b1020;
  --tb-navy-2:#111a33;
  --tb-indigo:#6366f1;
  --tb-indigo-d:#4f46e5;
  --tb-cyan:#22d3ee;
  --tb-emerald:#10b981;
  --tb-amber:#f59e0b;
  --tb-red:#ef4444;
  --tb-grad:linear-gradient(135deg,#6366f1 0%,#22d3ee 100%);
  --tb-grad-soft:linear-gradient(135deg,rgba(99,102,241,.14),rgba(34,211,238,.14));
  --tb-radius:14px;
  --tb-shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.06);
  --tb-shadow-lg:0 20px 60px rgba(15,23,42,.14);
  --tb-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --tb-sans:"Inter",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--tb-sans);color:var(--tb-ink);background:var(--tb-bg);
  line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--tb-indigo-d);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{font-family:"Poppins",var(--tb-sans);line-height:1.2;color:var(--tb-ink);margin:0 0 .5em}
h1{font-size:clamp(2rem,4vw,3.25rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.5rem,2.6vw,2.25rem);font-weight:700;letter-spacing:-.01em}
h3{font-size:1.25rem;font-weight:600}
p{margin:0 0 1rem}
.tb-container{max-width:1180px;margin:0 auto;padding:0 20px}
.tb-narrow{max-width:820px;margin:0 auto;padding:0 20px}
.tb-eyebrow{font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--tb-indigo-d)}
.tb-muted{color:var(--tb-muted)}
.tb-center{text-align:center}
.tb-lead{font-size:1.15rem;color:var(--tb-ink-soft)}
.tb-section{padding:72px 0}
.tb-section--tight{padding:48px 0}
.tb-surface{background:var(--tb-surface)}
.tb-grad-text{background:var(--tb-grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- Buttons ---------- */
.tb-btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:600;font-size:.98rem;
  padding:.72rem 1.35rem;border-radius:10px;border:1px solid transparent;cursor:pointer;transition:.16s ease;text-decoration:none}
.tb-btn:hover{text-decoration:none;transform:translateY(-1px)}
.tb-btn-primary{background:var(--tb-grad);color:#fff;box-shadow:0 8px 20px rgba(79,70,229,.28)}
.tb-btn-primary:hover{color:#fff;box-shadow:0 12px 28px rgba(79,70,229,.36)}
.tb-btn-dark{background:var(--tb-navy);color:#fff}
.tb-btn-dark:hover{color:#fff;background:#0f1730}
.tb-btn-ghost{background:#fff;color:var(--tb-ink);border-color:var(--tb-line)}
.tb-btn-ghost:hover{color:var(--tb-ink);border-color:#cbd5e1}
.tb-btn-light{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.25)}
.tb-btn-light:hover{color:#fff;background:rgba(255,255,255,.2)}
.tb-btn-lg{padding:.9rem 1.7rem;font-size:1.05rem}

/* ---------- Header / nav ---------- */
.tb-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(--tb-line)}
.tb-nav{display:flex;align-items:center;gap:1.25rem;height:66px}
.tb-brand{display:flex;align-items:center;gap:.6rem;flex-shrink:0}
.tb-brand img{height:40px;width:auto}
.tb-brand-badge{font-family:"Poppins",var(--tb-sans);font-weight:700;font-size:1.05rem;color:var(--tb-ink);
  padding-left:.6rem;border-left:1px solid var(--tb-line);letter-spacing:-.01em}
.tb-brand-badge .tb-grad-text{font-weight:800}
.tb-navlinks{display:flex;align-items:center;gap:.35rem;margin-left:.5rem}
.tb-navlinks a{color:var(--tb-ink-soft);font-weight:500;font-size:.95rem;padding:.5rem .7rem;border-radius:8px}
.tb-navlinks a:hover{color:var(--tb-ink);background:var(--tb-surface-2);text-decoration:none}
.tb-nav-cta{margin-left:auto;display:flex;align-items:center;gap:.5rem}
.tb-dd{position:relative}
.tb-dd>a::after{content:"\203A";display:inline-block;transform:rotate(90deg);margin-left:.3rem;opacity:.6;font-size:.9em}
.tb-dd-menu{position:absolute;top:calc(100% + 6px);left:0;min-width:240px;background:#fff;border:1px solid var(--tb-line);
  border-radius:12px;box-shadow:var(--tb-shadow-lg);padding:.4rem;opacity:0;visibility:hidden;transform:translateY(6px);transition:.15s}
.tb-dd:hover .tb-dd-menu{opacity:1;visibility:visible;transform:translateY(0)}
.tb-dd-menu a{display:flex;flex-direction:column;padding:.55rem .7rem;border-radius:8px;color:var(--tb-ink)}
.tb-dd-menu a small{color:var(--tb-muted);font-weight:400}
.tb-dd-menu a:hover{background:var(--tb-surface);text-decoration:none}
.tb-burger{display:none;margin-left:auto;background:none;border:1px solid var(--tb-line);border-radius:8px;padding:.45rem .6rem;cursor:pointer;font-size:1.1rem}
#tb-mobile{display:none;border-top:1px solid var(--tb-line);background:#fff}
#tb-mobile a{display:block;padding:.7rem 20px;color:var(--tb-ink-soft);border-bottom:1px solid var(--tb-surface-2)}
@media(max-width:960px){
  .tb-navlinks,.tb-nav-cta .tb-hide-sm{display:none}
  .tb-burger{display:inline-block}
  #tb-mobile.open{display:block}
}

/* ---------- Hero ---------- */
.tb-hero{position:relative;background:radial-gradient(1200px 500px at 70% -10%,rgba(99,102,241,.35),transparent),
  radial-gradient(900px 500px at 10% 10%,rgba(34,211,238,.18),transparent),var(--tb-navy);
  color:#e2e8f0;overflow:hidden;padding:84px 0 72px}
.tb-hero h1{color:#fff}
.tb-hero .tb-lead{color:#c7d2e5}
.tb-hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.tb-badge-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.1rem}
.tb-chip{display:inline-flex;align-items:center;gap:.4rem;font-size:.82rem;font-weight:600;
  padding:.35rem .7rem;border-radius:999px;background:rgba(255,255,255,.1);color:#fff;border:1px solid rgba(255,255,255,.16)}
.tb-hero-cta{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.6rem}
.tb-hero-note{margin-top:1.1rem;font-size:.88rem;color:#94a3b8}

/* ---------- Code blocks ---------- */
.tb-code{background:#0b1020;border:1px solid #1e293b;border-radius:12px;overflow:hidden;box-shadow:var(--tb-shadow-lg)}
.tb-code-head{display:flex;align-items:center;gap:.5rem;padding:.6rem .9rem;border-bottom:1px solid #1e293b;background:#0e1530}
.tb-dot{width:11px;height:11px;border-radius:50%;display:inline-block}
.tb-dot.r{background:#ef4444}.tb-dot.y{background:#f59e0b}.tb-dot.g{background:#10b981}
.tb-code-title{margin-left:.5rem;font-family:var(--tb-mono);font-size:.8rem;color:#94a3b8}
.tb-code pre{margin:0;padding:1.1rem 1.2rem;overflow-x:auto}
.tb-code code{font-family:var(--tb-mono);font-size:.83rem;line-height:1.7;color:#e2e8f0;white-space:pre}
.tb-code .k{color:#c4b5fd}.tb-code .s{color:#6ee7b7}.tb-code .n{color:#fbbf24}.tb-code .c{color:#64748b}.tb-code .p{color:#22d3ee}
p code,li code,td code{font-family:var(--tb-mono);font-size:.86em;background:var(--tb-surface-2);
  padding:.12em .4em;border-radius:5px;color:#be185d;border:1px solid var(--tb-line)}

/* ---------- Cards / grids ---------- */
.tb-grid{display:grid;gap:20px}
.tb-grid-2{grid-template-columns:repeat(2,1fr)}
.tb-grid-3{grid-template-columns:repeat(3,1fr)}
.tb-grid-4{grid-template-columns:repeat(4,1fr)}
.tb-card{background:#fff;border:1px solid var(--tb-line);border-radius:var(--tb-radius);padding:1.5rem;box-shadow:var(--tb-shadow);transition:.16s}
.tb-card:hover{transform:translateY(-3px);box-shadow:var(--tb-shadow-lg);border-color:#c7d2fe}
.tb-card h3{font-size:1.1rem}
.tb-ico{width:44px;height:44px;border-radius:11px;display:flex;align-items:center;justify-content:center;
  background:var(--tb-grad-soft);color:var(--tb-indigo-d);font-size:1.3rem;margin-bottom:1rem}
.tb-card-link{display:inline-flex;align-items:center;gap:.3rem;font-weight:600;margin-top:.5rem}
.tb-card-link::after{content:"\2192";transition:.15s}
.tb-card-link:hover::after{transform:translateX(3px)}

/* authority accent cards */
.tb-auth{border-top:3px solid var(--tb-indigo)}
.tb-auth.fbr{border-top-color:#e65c00}
.tb-auth.pra{border-top-color:#10b981}
.tb-auth.srb{border-top-color:#0ea5e9}
.tb-auth.kpra{border-top-color:#ef4444}
.tb-tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.04em;padding:.2rem .55rem;border-radius:6px;background:var(--tb-surface-2);color:var(--tb-ink-soft)}

/* ---------- Answer block (AI SEO) ---------- */
.tb-answer{background:var(--tb-grad-soft);border:1px solid #dbeafe;border-left:4px solid var(--tb-indigo);
  border-radius:12px;padding:1.2rem 1.4rem;margin:1.2rem 0}
.tb-answer h3{margin:0 0 .35rem;font-size:1.05rem}
.tb-answer p{margin:0;color:var(--tb-ink-soft)}

/* ---------- Steps ---------- */
.tb-steps{counter-reset:s;display:grid;gap:14px}
.tb-step{display:flex;gap:1rem;background:#fff;border:1px solid var(--tb-line);border-radius:12px;padding:1.1rem 1.25rem}
.tb-step-n{counter-increment:s;flex-shrink:0;width:34px;height:34px;border-radius:9px;background:var(--tb-grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700}
.tb-step-n::before{content:counter(s)}
.tb-step h4{margin:0 0 .2rem;font-size:1rem}
.tb-step p{margin:0;font-size:.92rem;color:var(--tb-muted)}

/* ---------- Comparison ---------- */
.tb-compare{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.tb-compare .col{border-radius:var(--tb-radius);padding:1.6rem;border:1px solid var(--tb-line)}
.tb-compare .bad{background:#fff}
.tb-compare .good{background:var(--tb-navy);color:#e2e8f0;border-color:transparent}
.tb-compare .good h3{color:#fff}
.tb-compare ul{list-style:none;margin:0;padding:0}
.tb-compare li{display:flex;gap:.6rem;padding:.4rem 0;font-size:.95rem}
.tb-compare .bad li::before{content:"\2717";color:var(--tb-red);font-weight:700}
.tb-compare .good li::before{content:"\2713";color:var(--tb-emerald);font-weight:700}

/* ---------- Table ---------- */
.tb-table-wrap{overflow-x:auto;border:1px solid var(--tb-line);border-radius:12px}
table.tb-table{width:100%;border-collapse:collapse;background:#fff;min-width:640px}
.tb-table th,.tb-table td{text-align:left;padding:.8rem 1rem;border-bottom:1px solid var(--tb-line);font-size:.92rem;vertical-align:top}
.tb-table thead th{background:var(--tb-navy);color:#fff;font-weight:600;font-size:.85rem}
.tb-table tbody tr:last-child td,.tb-table tr:last-child td{border-bottom:none}
.tb-table code{white-space:nowrap}

/* ---------- Architecture diagram ---------- */
.tb-arch{display:flex;flex-direction:column;align-items:center;gap:.5rem;text-align:center}
.tb-arch-node{background:#fff;border:1px solid var(--tb-line);border-radius:11px;padding:.8rem 1.2rem;font-weight:600;box-shadow:var(--tb-shadow);min-width:220px}
.tb-arch-node.accent{background:var(--tb-grad);color:#fff;border-color:transparent}
.tb-arch-arrow{color:var(--tb-indigo);font-size:1.3rem;line-height:1}
.tb-arch-fan{display:flex;flex-wrap:wrap;gap:.6rem;justify-content:center}
.tb-arch-fan .tb-arch-node{min-width:120px;padding:.6rem .9rem;font-size:.9rem}

/* ---------- Accordion ---------- */
.tb-acc{border:1px solid var(--tb-line);border-radius:12px;overflow:hidden;margin-bottom:.7rem;background:#fff}
.tb-acc summary{cursor:pointer;padding:1rem 1.2rem;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:1rem}
.tb-acc summary::-webkit-details-marker{display:none}
.tb-acc summary::after{content:"+";font-size:1.3rem;color:var(--tb-indigo);font-weight:400}
.tb-acc[open] summary::after{content:"\2013"}
.tb-acc .tb-acc-body{padding:0 1.2rem 1.1rem;color:var(--tb-ink-soft);font-size:.95rem}

/* ---------- Stat row ---------- */
.tb-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.tb-stat .n{font-family:"Poppins";font-size:2rem;font-weight:700}
.tb-stat .l{font-size:.85rem;color:var(--tb-muted)}

/* ---------- Pricing ---------- */
.tb-price{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.tb-plan{background:#fff;border:1px solid var(--tb-line);border-radius:var(--tb-radius);padding:1.6rem;display:flex;flex-direction:column}
.tb-plan.pop{border-color:var(--tb-indigo);box-shadow:0 0 0 3px rgba(99,102,241,.12),var(--tb-shadow-lg);position:relative}
.tb-plan.pop::before{content:"Most popular";position:absolute;top:-11px;left:50%;transform:translateX(-50%);
  background:var(--tb-grad);color:#fff;font-size:.72rem;font-weight:700;padding:.25rem .8rem;border-radius:999px}
.tb-plan .amt{font-family:"Poppins";font-size:2rem;font-weight:700;margin:.4rem 0}
.tb-plan .amt small{font-size:.9rem;font-weight:500;color:var(--tb-muted)}
.tb-plan ul{list-style:none;padding:0;margin:1rem 0;flex:1}
.tb-plan li{display:flex;gap:.5rem;padding:.35rem 0;font-size:.9rem;color:var(--tb-ink-soft)}
.tb-plan li::before{content:"\2713";color:var(--tb-emerald);font-weight:700}

/* ---------- CTA band ---------- */
.tb-ctaband{background:radial-gradient(800px 300px at 80% -20%,rgba(34,211,238,.3),transparent),var(--tb-navy);
  color:#fff;border-radius:20px;padding:56px 40px;text-align:center}
.tb-ctaband h2{color:#fff}
.tb-ctaband p{color:#c7d2e5;max-width:640px;margin:0 auto 1.5rem}

/* ---------- Breadcrumb ---------- */
.tb-crumb{font-size:.85rem;color:var(--tb-muted);padding:14px 0}
.tb-crumb a{color:var(--tb-muted)}
.tb-crumb a:hover{color:var(--tb-indigo-d)}

/* ---------- Footer ---------- */
.tb-footer{background:var(--tb-navy);color:#94a3b8;padding:56px 0 28px}
.tb-footer h4{color:#fff;font-size:.85rem;letter-spacing:.06em;text-transform:uppercase;margin-bottom:1rem}
.tb-foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:32px}
.tb-footer a{color:#94a3b8;display:block;padding:.28rem 0;font-size:.92rem}
.tb-footer a:hover{color:#fff;text-decoration:none}
.tb-foot-brand img{height:34px;margin-bottom:1rem;filter:brightness(0) invert(1)}
.tb-foot-brand p{font-size:.9rem;max-width:280px}
.tb-foot-bottom{border-top:1px solid #1e293b;margin-top:36px;padding-top:20px;display:flex;
  justify-content:space-between;flex-wrap:wrap;gap:1rem;font-size:.85rem}
.tb-foot-badge{display:inline-flex;align-items:center;gap:.5rem;background:rgba(255,255,255,.06);
  border:1px solid #1e293b;border-radius:8px;padding:.4rem .8rem;color:#cbd5e1;font-size:.82rem}

/* ---------- Utility ---------- */
.tb-hr{border:none;border-top:1px solid var(--tb-line);margin:0}
.tb-list-check{list-style:none;padding:0;margin:0}
.tb-list-check li{display:flex;gap:.6rem;padding:.35rem 0;color:var(--tb-ink-soft)}
.tb-list-check li::before{content:"\2713";color:var(--tb-emerald);font-weight:700;flex-shrink:0}
.tb-pill{display:inline-block;font-size:.72rem;font-weight:700;padding:.2rem .55rem;border-radius:6px;
  background:var(--tb-amber);color:#fff;letter-spacing:.03em}
.tb-mt-0{margin-top:0}.tb-mb-0{margin-bottom:0}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .tb-hero-grid{grid-template-columns:1fr;gap:32px}
  .tb-grid-4{grid-template-columns:repeat(2,1fr)}
  .tb-grid-3{grid-template-columns:repeat(2,1fr)}
  .tb-price{grid-template-columns:repeat(2,1fr)}
  .tb-stats{grid-template-columns:repeat(2,1fr)}
  .tb-foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .tb-section{padding:52px 0}
  .tb-grid-4,.tb-grid-3,.tb-grid-2,.tb-compare,.tb-price,.tb-stats{grid-template-columns:1fr}
  .tb-foot-grid{grid-template-columns:1fr 1fr}
  .tb-ctaband{padding:40px 22px}
}