/* InvoiceIguana design system — shared tokens + page chrome + marketing
   components. Linked by index, receipt, privacy, and the SEO landing pages.
   The invoice/receipt documents themselves are styled separately (paper-facing:
   shared/invoice.css, shared/receipt.css) and intentionally stay light.

   Everything lives in this file (no inline styles) so it satisfies the strict
   CSP in _headers (style-src 'self'). Dark mode is automatic via
   prefers-color-scheme — no toggle, no JS. */

:root {
  color-scheme: light dark;

  --bg: #f2f5f1;
  --surface: #ffffff;
  --surface-2: #edf1ec;
  --text: #16211b;
  --muted: #5c6a62;
  --border: #e1e7e1;

  /* Iguana brand — a fresh green fading to teal for the wordmark + primary CTA. */
  --brand: #12a06a;
  --brand-2: #0c9488;
  --brand-ink: #0a6b49;
  --on-brand: #ffffff;

  --danger: #c0392b;
  --err-bg: #fbe6e4;
  --err-border: #e6a9a3;
  --err-ink: #9a2b1e;
  --warn-bg: #fdf4d8;
  --warn-border: #e6cd85;
  --warn-ink: #856410;

  --ring: rgba(18, 160, 106, 0.30);
  --shadow: 0 1px 2px rgba(16, 33, 27, 0.05), 0 6px 20px rgba(16, 33, 27, 0.06);
  --shadow-lg: 0 16px 44px rgba(9, 60, 40, 0.13);

  --radius: 14px;
  --radius-sm: 9px;
  --maxw: 1060px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "Cascadia Mono", ui-monospace, Consolas, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1311;
    --surface: #171d19;
    --surface-2: #1e2621;
    --text: #e8ede9;
    --muted: #9aa79f;
    --border: #29322c;

    --brand: #2fc08a;
    --brand-2: #2bb6ac;
    --brand-ink: #7fe0bd;

    --err-bg: #3a1f1c;
    --err-border: #6d3a33;
    --err-ink: #f0b3ab;
    --warn-bg: #33290f;
    --warn-border: #5f4d1e;
    --warn-ink: #e9cf8e;

    --ring: rgba(47, 192, 138, 0.32);
    --shadow: none;
    --shadow-lg: 0 16px 44px rgba(0, 0, 0, 0.5);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

/* The `hidden` attribute must always win — otherwise author `display` rules
   (e.g. inputs set to display:block, totals rows to display:flex) override the
   UA `[hidden]{display:none}` and leak hidden controls/rows into view. */
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
@media (prefers-color-scheme: dark) { a { color: var(--brand); } }

/* ---- site header ---------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem clamp(1rem, 4vw, 2rem);
  padding-top: calc(0.7rem + env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
}
.wordmark:hover { text-decoration: none; }
.wordmark .lizard { font-size: 1.3rem; -webkit-text-fill-color: initial; }
.wordmark .name {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.site-header nav { display: flex; align-items: center; gap: 1.1rem; }
.site-header nav a { color: var(--muted); font-size: 0.9rem; font-weight: 600; }
.site-header nav a:hover { color: var(--text); text-decoration: none; }

/* Document-type switch lives in the header on the app pages. */
.type-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}
.type-switch select {
  min-width: 0;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  padding: 0.32rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

/* ---- buttons -------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font: inherit;
  font-weight: 600;
  line-height: 1;
  padding: 0.62rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  transition: filter 0.15s, border-color 0.15s, background 0.15s;
}
.btn:hover { text-decoration: none; border-color: color-mix(in srgb, var(--brand) 45%, var(--border)); }

.btn-primary {
  border: none;
  color: var(--on-brand);
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  box-shadow: 0 2px 10px color-mix(in srgb, var(--brand) 32%, transparent);
}
.btn-primary:hover { filter: brightness(1.07); }

.btn-lg { padding: 0.85rem 1.7rem; font-size: 1.02rem; border-radius: 11px; }

/* ---- hero + marketing sections -------------------------------------------- */

.hero {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 3.6rem) 1.25rem 1.25rem;
  text-align: center;
}
.hero h1 {
  margin: 0;
  font-size: clamp(1.9rem, 5.4vw, 2.7rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}
.hero .grad {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline {
  color: var(--muted);
  font-size: clamp(1rem, 2.4vw, 1.16rem);
  line-height: 1.55;
  max-width: 46ch;
  margin: 1rem auto 0;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; justify-content: center; margin-top: 1.5rem; }
.reassure {
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}
.reassure b { color: var(--brand-ink); font-weight: 700; }
@media (prefers-color-scheme: dark) { .reassure b { color: var(--brand); } }

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 4vw, 1.5rem) 3rem;
}
.page h1 { font-size: clamp(1.7rem, 4.4vw, 2.2rem); letter-spacing: -0.025em; margin: 0.5rem 0 0.4rem; }
.page h2 { font-size: 1.4rem; letter-spacing: -0.01em; margin: 2.4rem 0 0.8rem; }
.page h3 { font-size: 1.05rem; margin: 1.4rem 0 0.4rem; }
.page p { color: var(--text); }
.page .lede { color: var(--muted); font-size: 1.08rem; }

/* feature grid — reflows 3→1 with no media query */
.features {
  display: grid;
  gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 1.8rem 0;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow);
}
.feature .ico { font-size: 1.5rem; line-height: 1; }
.feature h3 { margin: 0.6rem 0 0.3rem; font-size: 1.02rem; }
.feature p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* how-it-works steps */
.steps { margin: 1.2rem 0; padding: 0; list-style: none; counter-reset: step; }
.steps li {
  position: relative;
  padding: 0.2rem 0 1.1rem 3rem;
  counter-increment: step;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 0;
  width: 2rem; height: 2rem;
  display: grid; place-items: center;
  border-radius: 50%;
  font-weight: 700; font-size: 0.9rem;
  color: var(--on-brand);
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
}
.steps li b { display: block; margin-bottom: 0.15rem; }

/* FAQ — native details/summary, no JS */
.faq details {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  padding: 0.2rem 1rem;
  margin: 0.6rem 0;
}
.faq summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.7rem 0;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--muted); font-weight: 400; }
.faq details[open] summary::after { content: "–"; }
.faq details[open] summary { color: var(--brand-ink); }
@media (prefers-color-scheme: dark) { .faq details[open] summary { color: var(--brand); } }
.faq details p { margin: 0 0 0.9rem; color: var(--muted); }

.section-cta { text-align: center; margin: 2.6rem 0 1rem; }

/* ---- site footer ---------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  margin-top: 2rem;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2.2rem clamp(1rem, 4vw, 2rem) calc(2.2rem + env(safe-area-inset-bottom));
  display: grid;
  gap: 1.6rem 2rem;
  grid-template-columns: 1.4fr repeat(auto-fit, minmax(140px, 1fr));
}
.footer-brand .wordmark { font-size: 1.05rem; }
.footer-brand p { color: var(--muted); font-size: 0.88rem; margin: 0.5rem 0 0; max-width: 32ch; }
.footer-col h4 {
  margin: 0 0 0.6rem;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
}
.footer-col a { display: block; color: var(--text); font-size: 0.9rem; padding: 0.18rem 0; }
.footer-col a:hover { color: var(--brand-ink); text-decoration: none; }
@media (prefers-color-scheme: dark) { .footer-col a:hover { color: var(--brand); } }
.footer-legal {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem) 2rem;
  color: var(--muted);
  font-size: 0.82rem;
}