:root{
  --bg:#0b1020;
  --surface:#ffffff;
  --surface-2:#f6f7fb;
  --ink:#111827;
  --ink-soft:#5b6474;
  --line:#e5e8f0;
  --brand:#4f46e5;
  --brand-2:#6d28d9;
  --brand-ink:#ffffff;
  --accent:#10b981;
  --danger:#ef4444;
  --radius:14px;
  --shadow:0 10px 30px rgba(17,24,39,.08);
  --shadow-lg:0 24px 60px rgba(17,24,39,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  color:var(--ink);
  background:var(--surface-2);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em}
p{margin:0 0 .5em}
.container{width:min(1180px,92vw);margin-inline:auto}
.narrow{width:min(760px,92vw)}
.muted{color:var(--ink-soft)}

/* ---------- Buttons ---------- */
.btn{
  --btn-bg:var(--brand);
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font:inherit;font-weight:600;font-size:.95rem;
  padding:.7em 1.3em;border-radius:10px;border:1px solid transparent;
  background:var(--btn-bg);color:var(--brand-ink);
  cursor:pointer;text-decoration:none;
  transition:transform .12s ease,box-shadow .12s ease,background .12s ease,border-color .12s;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));box-shadow:0 8px 20px rgba(79,70,229,.32)}
.btn-primary:hover{box-shadow:0 12px 26px rgba(79,70,229,.4)}
.btn-secondary{background:#eef0ff;color:var(--brand);border-color:#dcdffe}
.btn-secondary:hover{background:#e3e6ff}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:#fff}
.btn-dashed{width:100%;margin-top:.6rem;background:#fff;color:var(--brand);border:1.5px dashed var(--brand);font-weight:600}
.btn-dashed:hover{background:#f5f6ff}
.btn-sm{padding:.5em 1em;font-size:.88rem}
.btn-lg{padding:.85em 1.7em;font-size:1.02rem}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.85);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:1.5rem;height:66px}
.logo{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.1rem}
.logo-mark{
  display:grid;place-items:center;width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;font-size:.85rem;font-weight:800;letter-spacing:.02em;
}
.logo-mark.sm{width:24px;height:24px;font-size:.65rem;border-radius:6px;display:inline-grid;vertical-align:middle;margin-right:.35rem}
.logo-text em{font-style:normal;color:var(--brand)}
.main-nav{display:flex;gap:1.4rem;margin-left:auto}
.main-nav a{color:var(--ink-soft);text-decoration:none;font-weight:500;font-size:.95rem}
.main-nav a:hover{color:var(--brand)}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(1000px 400px at 80% -10%,rgba(109,40,217,.35),transparent 60%),
    radial-gradient(800px 500px at 10% 110%,rgba(16,185,129,.22),transparent 55%),
    var(--bg);
  color:#fff;text-align:center;padding:5.5rem 0 4.5rem;
}
.hero-badge{
  display:inline-block;padding:.4em 1em;border-radius:999px;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);
  font-size:.82rem;font-weight:600;letter-spacing:.02em;margin-bottom:1.4rem;
}
.hero h1{font-size:clamp(2.1rem,5.4vw,3.7rem);font-weight:800;letter-spacing:-.02em;max-width:16ch;margin-inline:auto}
.hero-sub{color:#c8cddf;font-size:1.12rem;max-width:60ch;margin:1rem auto 2rem}
.hero-actions{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}
.hero .btn-ghost{color:#fff;border-color:rgba(255,255,255,.3);background:rgba(255,255,255,.06)}
.hero .btn-ghost:hover{background:rgba(255,255,255,.14)}
.hero-points{list-style:none;display:flex;gap:.6rem 1.6rem;justify-content:center;flex-wrap:wrap;padding:0;margin:2.4rem 0 0;color:#aeb6cd;font-size:.9rem}
.hero-points li{display:flex;align-items:center;gap:.45rem}
.hero-points li::before{content:"✓";color:var(--accent);font-weight:700}

/* ---------- Generator layout ---------- */
.generator{padding:3.5rem 0 4rem}
.generator-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:2rem;align-items:start}
@media(max-width:960px){.generator-grid{grid-template-columns:1fr}}

/* ---------- Editor cards ---------- */
.editor{display:flex;flex-direction:column;gap:1.1rem}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.2rem 1.3rem;box-shadow:var(--shadow);margin:0;min-width:0;
}
.card legend{
  font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;
  color:var(--brand);padding:0 .4rem;margin-left:-.2rem;
}
.field{display:flex;flex-direction:column;gap:.32rem;margin-bottom:.8rem;min-width:0}
.field:last-child{margin-bottom:0}
.field span{font-size:.82rem;font-weight:600;color:var(--ink-soft)}
.field input,.field select,.field textarea{
  font:inherit;font-size:.94rem;color:var(--ink);
  padding:.6em .75em;border:1px solid var(--line);border-radius:9px;
  background:#fff;width:100%;transition:border-color .12s,box-shadow .12s;
}
.field textarea{resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(79,70,229,.15);
}
.field-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.8rem}
.field-row .field{margin-bottom:.8rem}

/* ---------- Line items ---------- */
.items-head,.item-row{
  display:grid;grid-template-columns:minmax(0,1fr) 64px 96px 34px;gap:.5rem;align-items:center;
}
.items-head{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);margin-bottom:.4rem;padding:0 .1rem}
.items-head span:nth-child(2),.items-head span:nth-child(3){text-align:right}
.item-row{margin-bottom:.5rem}
.item-row input{font-size:.9rem;padding:.5em .6em}
.item-row .desc{text-align:left}
.item-row .qty,.item-row .rate{text-align:right}
.item-del{
  width:34px;height:34px;border-radius:8px;border:1px solid var(--line);
  background:#fff;color:var(--ink-soft);cursor:pointer;font-size:1.1rem;line-height:1;
  display:grid;place-items:center;transition:.12s;
}
.item-del:hover{background:#fef2f2;color:var(--danger);border-color:#fecaca}
.item-row .amt{display:none}

/* ---------- Preview ---------- */
.preview-wrap{position:sticky;top:86px}
@media(max-width:960px){.preview-wrap{position:static}}
.preview-label{
  font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;
  color:var(--ink-soft);margin-bottom:.6rem;
}
.invoice{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-lg);padding:2.2rem;color:var(--ink);
  font-size:.95rem;min-height:600px;
}
@media(max-width:520px){.invoice{padding:1.4rem}}
.inv-head{display:flex;justify-content:space-between;gap:1.5rem;padding-bottom:1.2rem;border-bottom:2px solid var(--ink)}
.inv-title{font-size:1.7rem;font-weight:800;letter-spacing:.06em;margin:0}
.inv-number{font-family:"Roboto Mono",monospace;color:var(--brand);font-size:.9rem;font-weight:500;margin:.2rem 0 0}
.inv-from{text-align:right;font-size:.88rem;color:var(--ink-soft)}
.inv-from p{margin:0}
.inv-from-name{font-weight:700;color:var(--ink);font-size:1.02rem}
.inv-parties{display:flex;justify-content:space-between;gap:1.5rem;padding:1.3rem 0}
.inv-parties h3{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-soft);margin:0 0 .4rem}
.inv-parties p{margin:0;font-size:.9rem;color:var(--ink-soft)}
.inv-parties .strong{font-weight:700;color:var(--ink);font-size:.98rem}
.inv-dates{text-align:right;min-width:150px}
.inv-dates p{display:flex;justify-content:space-between;gap:1rem;margin:0 0 .35rem}
.inv-dates span{color:var(--ink-soft)}
.inv-dates strong{color:var(--ink)}
.inv-table{width:100%;border-collapse:collapse;margin-top:.4rem}
.inv-table th{
  text-align:left;font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;
  color:var(--ink-soft);padding:.6rem .5rem;border-bottom:1.5px solid var(--ink);
}
.inv-table td{padding:.65rem .5rem;border-bottom:1px solid var(--line);font-size:.92rem;vertical-align:top}
.inv-table .num{text-align:right;white-space:nowrap}
.inv-table .empty{text-align:center;color:var(--ink-soft);font-style:italic;padding:1.6rem}
.inv-summary{display:flex;justify-content:flex-end;margin-top:1.1rem}
.summary-rows{width:min(280px,100%)}
.summary-rows p{display:flex;justify-content:space-between;gap:1rem;margin:0 0 .45rem;font-size:.92rem;color:var(--ink-soft)}
.summary-rows strong{color:var(--ink);font-weight:600}
.summary-rows em{font-style:normal;font-size:.85em}
.summary-rows .grand{
  border-top:2px solid var(--ink);padding-top:.6rem;margin-top:.6rem;
  font-size:1.12rem;color:var(--ink);font-weight:700;
}
.summary-rows .grand strong{font-size:1.25rem;font-weight:800;color:var(--brand)}
.inv-foot{display:flex;gap:2rem;justify-content:space-between;margin-top:2rem;padding-top:1.2rem;border-top:1px solid var(--line);flex-wrap:wrap}
.inv-foot h4{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-soft);margin:0 0 .3rem}
.inv-foot p{font-size:.86rem;color:var(--ink-soft);margin:0;max-width:44ch}
.inv-foot div:empty{display:none}

/* ---------- Sections ---------- */
.section{padding:4rem 0}
.section-alt{background:#fff;border-block:1px solid var(--line)}
.section h2{font-size:clamp(1.5rem,3vw,2.1rem);text-align:center;margin-bottom:2.4rem;letter-spacing:-.01em}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.4rem}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem;box-shadow:var(--shadow)}
.step-num{
  display:grid;place-items:center;width:38px;height:38px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:800;margin-bottom:.9rem;
}
.step h3{font-size:1.1rem}
.step p{color:var(--ink-soft);font-size:.94rem;margin:0}

/* ---------- FAQ ---------- */
details{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:.2rem 1.2rem;margin-bottom:.8rem;box-shadow:var(--shadow);
}
summary{
  cursor:pointer;font-weight:600;padding:.95rem 0;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:1rem;
}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:1.4rem;color:var(--brand);font-weight:400;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--ink-soft);padding:0 0 1rem;margin:0;font-size:.94rem}

/* ---------- Editor action bar ---------- */
.editor-actions{
  position:sticky;bottom:0;display:flex;gap:.7rem;justify-content:flex-end;flex-wrap:wrap;
  padding:.9rem;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg);color:#aab2c9;padding:2.2rem 0;font-size:.9rem}
.footer-inner{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;align-items:center}
.site-footer p{margin:0;color:#e6e9f4}
.site-footer .muted{color:#8b93ab}

/* ---------- Responsive ---------- */
@media(max-width:760px){
  .main-nav{display:none}
  .header-inner .btn{margin-left:auto}
  .hero{padding:3.5rem 0 3rem}
  .inv-head{flex-direction:column;gap:1rem}
  .inv-from{text-align:left}
  .inv-parties{flex-direction:column}
  .inv-dates{text-align:left}
  .editor-actions .btn{flex:1 1 auto}
}

/* ---------- Print / PDF ---------- */
@media print{
  @page{margin:12mm}
  body{background:#fff}
  .no-print,.site-header,.hero,.editor,.section,.site-footer{display:none !important}
  .generator{padding:0}
  .generator-grid{display:block}
  .preview-wrap{position:static}
  .preview-label{display:none}
  .invoice{
    border:none;box-shadow:none;border-radius:0;padding:0;min-height:0;
    width:100%;color:#000;
  }
}

/* ---------- Accessibility helpers ---------- */
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
/* visible focus for keyboard users (buttons/links/summary) */
.btn:focus-visible,
.item-del:focus-visible,
.main-nav a:focus-visible,
.logo:focus-visible,
summary:focus-visible{
  outline:3px solid var(--brand);
  outline-offset:2px;
  border-radius:6px;
}

/* ---------- Validation messages (Fix #4) ---------- */
.validation{
  background:#fff;border:1px solid var(--line);border-left:4px solid var(--brand);
  border-radius:10px;padding:.8rem 1rem;box-shadow:var(--shadow);
}
.validation.has-errors{border-left-color:var(--danger)}
.validation ul{margin:0;padding-left:1.1rem}
.validation li{font-size:.88rem;margin:.25rem 0;line-height:1.45}
.validation li.v-error{color:#b91c1c;font-weight:600}
.validation li.v-warn{color:#92400e}

/* ---------- Copy status (Fix #5) ---------- */
.copy-status{font-size:.85rem;font-weight:600;align-self:center}
.copy-status.ok{color:var(--accent)}
.copy-status.fail{color:var(--danger)}

/* ---------- Print hardening (Fix #7) ----------
   - repeat table headers on every printed page
   - never split a line item across pages
   - keep summary/footer blocks together when they fit
   - avoid blank pages (min-height already removed in print block above) */
@media print{
  .inv-table thead{display:table-header-group}
  .inv-table tr{break-inside:avoid;page-break-inside:avoid}
  .inv-summary,.inv-foot{break-inside:avoid;page-break-inside:avoid}
  .validation,.copy-status{display:none !important}
  a[href]::after{content:""}
}

/* ============================================================
   Phase 2 — Content / article pages (ADDITIVE ONLY)
   New namespaced classes; no existing rules above are modified.
   ============================================================ */

/* ---------- Content page hero ---------- */
.page-hero{
  background:
    radial-gradient(900px 380px at 82% -10%,rgba(109,40,217,.32),transparent 60%),
    var(--bg);
  color:#fff;padding:3.2rem 0 2.8rem;
}
.page-hero .eyebrow{
  font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;
  color:#aeb6cd;margin:0 0 .6rem;
}
.page-hero h1{font-size:clamp(1.8rem,4vw,2.9rem);font-weight:800;letter-spacing:-.02em;margin:0 0 .6rem;max-width:22ch}
.page-hero .lede{color:#c8cddf;font-size:1.08rem;max-width:62ch;margin:0}
.breadcrumb{list-style:none;display:flex;flex-wrap:wrap;gap:.4rem;padding:0;margin:0 0 1.1rem;font-size:.85rem;color:#aeb6cd}
.breadcrumb li{display:flex;align-items:center;gap:.4rem}
.breadcrumb li+li::before{content:"/";color:#6b7488}
.breadcrumb a{color:#c8cddf;text-decoration:none}
.breadcrumb a:hover{color:#fff}
.breadcrumb [aria-current]{color:#fff;font-weight:600}

/* ---------- Article body ---------- */
.article{padding:3rem 0 3.6rem}
.prose{max-width:72ch}
.prose h2{font-size:clamp(1.35rem,2.4vw,1.8rem);letter-spacing:-.01em;margin:2.2rem 0 .7rem}
.prose h3{font-size:1.12rem;margin:1.6rem 0 .5rem}
.prose p{color:var(--ink-soft);font-size:1rem;margin:0 0 1rem}
.prose a{color:var(--brand);font-weight:600;text-decoration:none}
.prose a:hover{text-decoration:underline}
.prose ul,.prose ol{color:var(--ink-soft);font-size:1rem;margin:0 0 1.1rem;padding-left:1.3rem}
.prose li{margin-bottom:.45rem}
.prose li::marker{color:var(--brand);font-weight:700}
.prose strong{color:var(--ink)}
.prose blockquote{
  margin:1.4rem 0;padding:.9rem 1.2rem;border-left:4px solid var(--brand);
  background:#fff;border-radius:0 var(--radius) var(--radius) 0;box-shadow:var(--shadow);
  color:var(--ink);font-size:1rem;
}
.prose blockquote p{margin:0;color:var(--ink)}

/* checklist */
.checklist{list-style:none;padding:0;margin:0 0 1.2rem}
.checklist li{position:relative;padding-left:1.9rem;margin-bottom:.6rem;color:var(--ink-soft)}
.checklist li::before{
  content:"✓";position:absolute;left:0;top:0;
  display:grid;place-items:center;width:1.35rem;height:1.35rem;border-radius:6px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:.8rem;font-weight:800;
}

/* data table */
.prose table{
  width:100%;border-collapse:collapse;margin:.6rem 0 1.4rem;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);
}
.prose th,.prose td{text-align:left;padding:.7rem .9rem;border-bottom:1px solid var(--line);font-size:.93rem;vertical-align:top}
.prose thead th{
  font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);
  background:var(--surface-2);border-bottom:1.5px solid var(--ink);
}
.prose tbody tr:last-child td{border-bottom:0}
.prose td strong{color:var(--ink)}

/* CTA band */
.cta-band{
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;border-radius:var(--radius);padding:2rem 1.8rem;margin:2.4rem 0 0;
  box-shadow:0 16px 40px rgba(79,70,229,.3);text-align:center;
}
.cta-band h2{color:#fff;font-size:clamp(1.3rem,2.4vw,1.7rem);margin:0 0 .5rem}
.cta-band p{color:#e3e6ff;margin:0 auto 1.2rem;max-width:52ch}
.cta-band .btn{background:#fff;color:var(--brand)}
.cta-band .btn:hover{background:#f2f3ff}

/* static invoice example (reuses .invoice look, no JS) */
.example-invoice{max-width:640px;margin:1.6rem 0 0}
.example-invoice .invoice{min-height:0;padding:1.8rem}

/* related links */
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.2rem;margin:1.6rem 0 0}
.related a{
  display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:1.2rem 1.3rem;box-shadow:var(--shadow);text-decoration:none;color:var(--ink);transition:.15s;
}
.related a:hover{border-color:var(--brand);transform:translateY(-2px)}
.related .k{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--brand);display:block;margin-bottom:.3rem}
.related .t{font-weight:700;display:block;margin-bottom:.2rem}
.related .d{color:var(--ink-soft);font-size:.9rem;margin:0}

/* footer nav column for content pages */
.footer-nav{display:flex;gap:1.4rem;flex-wrap:wrap}
.footer-nav a{color:#c8cddf;text-decoration:none;font-weight:500}
.footer-nav a:hover{color:#fff}

/* scroll container for wide example tables on narrow screens (scoped to examples) */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.example-invoice .inv-table{min-width:320px}