/* Zero Diff Labs — site styles. No frameworks, no web fonts (system stacks for speed). */
:root{
  --ink:#0f1b2d; --ink-2:#22324a; --muted:#5b6b80; --paper:#f7f9f6; --card:#ffffff;
  --line:#dfe6e1; --grid:#e9efea; --zero:#0d9f6e; --zero-2:#0a7d57; --zero-bg:#e3f6ee;
  --red:#c2410c; --amber:#fff4d6; --amber-line:#e7c565;
  --radius:12px; --shadow:0 1px 2px rgba(15,27,45,.06),0 8px 24px rgba(15,27,45,.06);
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","DejaVu Sans Mono",monospace;
  --max:1120px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;font-family:var(--sans);font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--paper)}
img,svg{max-width:100%;height:auto}
a{color:var(--zero-2);text-underline-offset:3px}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--zero);outline-offset:3px;border-radius:4px}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em;margin:0 0 .6em}
h1{font-size:clamp(2.2rem,5.2vw,3.6rem);letter-spacing:-.025em}
h2{font-size:clamp(1.6rem,3.2vw,2.2rem)}
h3{font-size:1.2rem}
p{margin:0 0 1em}
code,.mono{font-family:var(--mono);font-size:.92em}
.wrap{max-width:var(--max);margin:0 auto;padding:0 1.25rem}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:100}
.skip:focus{left:1rem;top:1rem}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* Preview banner */
.preview-bar{background:var(--ink);color:#cfe9dd;font:600 .8rem/1.4 var(--mono);text-align:center;padding:.45rem 1rem}
.preview-bar b{color:#fff}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,249,246,.92);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:1rem;min-height:68px}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);font:700 1.15rem/1 var(--mono);letter-spacing:-.02em;white-space:nowrap}
.brand svg{width:34px;height:34px;flex:none}
.brand .d{color:var(--zero)}
.nav-links{display:flex;align-items:center;gap:.25rem;margin-left:auto;list-style:none;padding:0;margin-top:0;margin-bottom:0}
.nav-links a{display:block;padding:.5rem .65rem;border-radius:8px;color:var(--ink-2);text-decoration:none;font-weight:500;font-size:.97rem}
.nav-links a:hover{background:var(--grid);color:var(--ink)}
.nav-links a[aria-current="page"]{color:var(--zero-2);font-weight:650}
.nav-cta{display:flex;gap:.5rem;align-items:center}
.nav-portal-m{display:none!important;margin-left:auto}
.nav-toggle{display:none;margin-left:.5rem;background:none;border:1px solid var(--line);border-radius:8px;padding:.45rem .6rem;font:600 .9rem var(--mono);color:var(--ink);cursor:pointer}
@media (max-width:1180px){
  .nav{flex-wrap:wrap;padding-top:.5rem;padding-bottom:.5rem}
  .nav-portal-m{display:inline-flex!important}
  .nav-toggle{display:block}
  .nav-menu{display:none;width:100%;padding:.5rem 0 1rem}
  .nav-menu.open{display:block}
  .nav-links{flex-direction:column;align-items:stretch;margin:0}
  .nav-links a{padding:.7rem .5rem;border-bottom:1px solid var(--grid);border-radius:0}
  .nav-cta{margin-top:.8rem;flex-wrap:wrap}
  .nav-cta .btn{flex:1;justify-content:center}
}
@media (min-width:1181px){.nav-menu{display:flex;align-items:center;gap:1rem;margin-left:auto}}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:.45rem;padding:.7rem 1.15rem;border-radius:10px;font-weight:650;font-size:.98rem;text-decoration:none;border:2px solid transparent;cursor:pointer;line-height:1.2;transition:transform .12s ease,background .12s ease}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--zero);color:#fff}
.btn-primary:hover{background:var(--zero-2);color:#fff}
.btn-portal{background:var(--ink);color:#fff}
.btn-portal:hover{background:var(--ink-2);color:#fff}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-sm{padding:.5rem .85rem;font-size:.9rem}
.btn-lg{padding:.9rem 1.4rem;font-size:1.05rem}

/* Sections */
section{padding:4.5rem 0}
.section-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{font:600 .8rem/1 var(--mono);color:var(--zero-2);text-transform:uppercase;letter-spacing:.08em;margin-bottom:.9rem;display:block}
.lede{font-size:1.18rem;color:var(--ink-2);max-width:62ch}
.center{text-align:center}.center .lede{margin-left:auto;margin-right:auto}

/* Hero */
.hero{position:relative;padding:4.5rem 0 4rem;overflow:hidden;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:32px 32px;background-position:-1px -1px}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(247,249,246,0) 60%,var(--paper));pointer-events:none}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:center}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;gap:2.25rem}}
.hero h1 .zero{color:var(--zero);white-space:nowrap}
@media (max-width:560px){.hero-ctas .btn{width:100%;justify-content:center}.nav{gap:.4rem}.brand{font-size:.98rem;gap:.45rem}.brand svg{width:30px;height:30px}.nav-portal-m{padding:.45rem .65rem}.nav-toggle{padding:.45rem .5rem}}
.hero-ctas{display:flex;flex-wrap:wrap;gap:.75rem;margin:1.75rem 0 1.25rem}
.trust{display:flex;flex-wrap:wrap;gap:.4rem .9rem;font-size:.92rem;color:var(--muted);list-style:none;padding:0;margin:0}
.trust li::before{content:"✓ ";color:var(--zero);font-weight:700}

/* Terminal / recon card */
.terminal{background:#0b1422;color:#d7e3f4;border-radius:14px;box-shadow:0 20px 50px rgba(15,27,45,.25);font:0.9rem/1.6 var(--mono);overflow:hidden;border:1px solid #1d2b40}
.term-bar{display:flex;gap:6px;align-items:center;padding:.65rem .9rem;background:#111d30;border-bottom:1px solid #1d2b40}
.term-bar i{width:11px;height:11px;border-radius:50%;background:#33445e;display:block}
.term-bar span{margin-left:.6rem;color:#7d90ab;font-size:.78rem}
.term-body{padding:1rem 1.1rem 1.2rem}
.term-body .p{color:#5fd4a4}.term-body .c{color:#7d90ab}.term-body .ok{color:#5fd4a4;font-weight:700}
.term-body .add{color:#5fd4a4}.term-body .del{color:#ff8f7a}
.recon{width:100%;border-collapse:collapse;margin:.6rem 0 .4rem;font-size:.85rem}
.recon th,.recon td{padding:.25rem .3rem;text-align:right;border-bottom:1px dashed #22324a}
.recon th:first-child,.recon td:first-child{text-align:left}
.recon th{color:#7d90ab;font-weight:500}
.recon .zero{color:#5fd4a4;font-weight:700}
.cursor{display:inline-block;width:.6em;height:1.05em;background:#5fd4a4;vertical-align:text-bottom;animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

/* Cards */
.grid{display:grid;gap:1.25rem}
.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
@media (max-width:900px){.g3{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.g3,.g2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow)}
.card h3{display:flex;gap:.55rem;align-items:center}
.card .ico{font-size:1.35rem}
.card p:last-child{margin-bottom:0}
.card-feature{border-color:var(--zero);box-shadow:0 0 0 3px var(--zero-bg),var(--shadow)}
.tag{display:inline-block;font:600 .72rem/1 var(--mono);padding:.3rem .5rem;border-radius:6px;background:var(--zero-bg);color:var(--zero-2);margin-bottom:.7rem;text-transform:uppercase;letter-spacing:.05em}

/* Why list (diff style) */
.diff-list{list-style:none;padding:0;margin:0;display:grid;gap:.75rem}
.diff-list li{background:#fff;border:1px solid var(--line);border-left:4px solid var(--zero);border-radius:10px;padding:1rem 1.2rem}
.diff-list li strong{display:block;font-family:var(--mono);font-size:.98rem;margin-bottom:.2rem}
.diff-list li strong::before{content:"+ ";color:var(--zero)}

/* Steps */
.steps{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;gap:1rem}
.steps li{counter-increment:s;position:relative;padding:1.1rem 1.2rem 1.1rem 4.2rem;background:#fff;border:1px solid var(--line);border-radius:12px}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:1.1rem;top:1rem;font:700 1.3rem/1 var(--mono);color:var(--zero)}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
@media (max-width:900px){.split{grid-template-columns:1fr;gap:2rem}}
.checks{list-style:none;padding:0;margin:0 0 1.5rem}
.checks li{padding:.35rem 0 .35rem 1.8rem;position:relative}
.checks li::before{content:"✓";position:absolute;left:0;top:.35rem;width:1.25rem;height:1.25rem;border-radius:50%;background:var(--zero-bg);color:var(--zero-2);font-size:.8rem;font-weight:700;display:grid;place-items:center}

/* Placeholders (visible in preview so placeholders are easy to find) */
.ph{background:var(--amber);border:1px dashed var(--amber-line);border-radius:5px;padding:0 .3em;font-family:var(--mono);font-size:.88em;color:#6b4e00}
.ph-block{background:var(--amber);border:2px dashed var(--amber-line);border-radius:var(--radius);padding:1.5rem;color:#6b4e00;font-family:var(--mono);font-size:.92rem}
.photo-ph{aspect-ratio:4/5;display:grid;place-items:center;text-align:center}

/* Notices */
.notice{display:flex;gap:.8rem;align-items:flex-start;background:#eef3fb;border:1px solid #c9d7ee;border-radius:12px;padding:1rem 1.1rem;font-size:.97rem}
.notice-lock{background:var(--zero-bg);border-color:#a7e3c9}
.notice-warn{background:var(--amber);border-color:var(--amber-line)}
.notice .ico{font-size:1.25rem;line-height:1.4}
.notice p:last-child{margin:0}
.draft-banner{background:#fde8e1;border:2px dashed var(--red);color:#7a2a08;border-radius:12px;padding:1rem 1.2rem;margin-bottom:2rem;font-weight:600}

/* CTA band */
.cta-band{background:var(--ink);color:#e6eef8;border-radius:18px;padding:3rem 2rem;text-align:center;position:relative;overflow:hidden}
.cta-band h2{color:#fff}
.cta-band p{color:#b9c7da;max-width:52ch;margin:0 auto 1.5rem}
.cta-band .diffcol{font-family:var(--mono);color:#5fd4a4}
.cta-band .btns{display:flex;gap:.75rem;justify-content:center;flex-wrap:wrap}
.cta-band .btn-ghost{border-color:#5d7290;color:#fff}

/* Page header */
.page-head{padding:3.5rem 0 2.5rem;border-bottom:1px solid var(--line);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:32px 32px}
.crumb{font:500 .85rem var(--mono);color:var(--muted);margin-bottom:.8rem}
.crumb a{color:var(--muted)}
.prose{max-width:72ch}
.prose h2{margin-top:2.2rem}
.prose h3{margin-top:1.6rem}
.prose ul{padding-left:1.25rem}
.prose li{margin:.3rem 0}

/* Tables */
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:.95rem}
.tbl th,.tbl td{padding:.75rem .9rem;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl thead th{background:var(--ink);color:#fff;font-weight:600}
.tbl-wrap{overflow-x:auto}

/* Pricing */
.price{font:700 1.6rem/1.2 var(--mono);margin:.4rem 0 1rem}
.price small{font-size:.9rem;color:var(--muted);font-weight:500}

/* FAQ */
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 1.2rem;margin-bottom:.75rem}
.faq summary{cursor:pointer;padding:1rem 0;font-weight:650;list-style:none;display:flex;justify-content:space-between;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:700 1.2rem/1 var(--mono);color:var(--zero)}
.faq details[open] summary::after{content:"−"}
.faq details > div{padding:0 0 1rem;color:var(--ink-2)}

/* Forms */
form .field{margin-bottom:1rem}
label{display:block;font-weight:600;margin-bottom:.35rem;font-size:.95rem}
.hint{font-weight:400;color:var(--muted);font-size:.88rem}
input,select,textarea{width:100%;font:inherit;padding:.7rem .8rem;border:1.5px solid #c9d3cd;border-radius:9px;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{border-color:var(--zero);outline:3px solid var(--zero-bg)}
textarea{min-height:140px;resize:vertical}
.check{display:flex;gap:.6rem;align-items:flex-start;font-weight:500}
.check input{width:auto;margin-top:.35rem}
.hp{position:absolute;left:-5000px}

/* Calendly placeholder */
.embed-ph{min-height:520px;display:grid;place-items:center;text-align:center;background:#fff;border:2px dashed #b8c6be;border-radius:var(--radius);padding:2rem;color:var(--muted)}
.embed-ph code{display:block;margin-top:.75rem;color:var(--ink-2)}

/* Footer */
.site-footer{background:var(--ink);color:#b9c7da;margin-top:4rem;padding:3.5rem 0 2rem;font-size:.95rem}
.site-footer a{color:#e6eef8;text-decoration:none}
.site-footer a:hover{text-decoration:underline;color:#fff}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:2rem}
@media (max-width:900px){.foot-grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.foot-grid{grid-template-columns:1fr}}
.site-footer h2{font:600 .8rem/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:#7d90ab;margin-bottom:1rem}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:.4rem 0}
.site-footer .brand{color:#fff;margin-bottom:.9rem}
.foot-note{border-top:1px solid #22324a;margin-top:2.5rem;padding-top:1.5rem;font-size:.85rem;color:#8ea0b8}
.foot-note p{margin:.4rem 0}
.foot-portal{background:#13233a;border:1px solid #22324a;border-radius:10px;padding:.9rem 1rem;margin-top:.5rem}
.site-footer .ph{color:#6b4e00}

/* Intuit ProAdvisor tier badge: unaltered artwork, uniform scaling only, clear space around it, never used as our logo */
.badge-inline{display:flex;align-items:center;gap:1rem;margin-top:1.1rem}
.pa-badge{flex:none;display:block;margin:.25rem;object-fit:contain}
.hero-badge span{font-size:.92rem;color:var(--muted);font-weight:600}
.about-badge{background:#fff;border:1px solid var(--line);border-radius:12px;padding:1rem 1.25rem;margin-top:1rem}
.foot-badge{margin:0 0 .75rem}
.foot-badge span{font-size:.85rem;color:#b9c7da}

/* Pricing packages (real prices, Oct 2026) */
.pkg{display:flex;flex-direction:column}
.pkg .btn{margin-top:auto;align-self:flex-start}
.pkg .tag{align-self:flex-start}
.pkg .price small:first-child{margin-right:.15rem}
.plist{list-style:none;padding:0;margin:0 0 .75rem;border-top:1px solid var(--line)}
.plist li{display:flex;justify-content:space-between;gap:1rem;padding:.55rem 0;border-bottom:1px dashed var(--line);font-size:.93rem}
.plist li b{font-family:var(--mono);font-weight:700;text-align:right;color:var(--zero-2);white-space:normal;max-width:55%}
.ptbl td:last-child{font-family:var(--mono);font-weight:600;width:42%;font-size:.88rem}

@media (max-width:1180px){.nav-toggle{margin-left:auto}}
.nav-links a,.nav-cta .btn{white-space:nowrap}