/* NSFlow public site: minimal, light, premium. Ink, warm grays, one accent
   that only ever marks the check. See brand/README.md for the mark. */

:root {
  --ink: #0b0b0c;
  --ink-2: #3f3f46;   /* zinc-700 */
  --ink-3: #71717a;   /* zinc-500 */
  --ink-4: #a1a1aa;   /* zinc-400 */
  --line: #ececef;
  --line-2: #e4e4e7;  /* zinc-200 */
  --soft: #fafafa;
  --accent: #2b4acb;
  --accent-tint: #eef1ff;
  --ok: #2b4acb;
  --danger: #dc2626;
  --r: 10px;
  --r-lg: 16px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; font-family: var(--font); font-size: 1.0625rem; line-height: 1.6;
  color: var(--ink-2); background: #fff; -webkit-font-smoothing: antialiased;
}
::selection { background: var(--accent-tint); color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
a { color: inherit; text-decoration: none; }
h1, h2 { color: var(--ink); margin: 0; text-wrap: balance; }
p { margin: 0; }
svg { display: block; }


.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 8px 12px; border-radius: var(--r); z-index: 100; }
.skip:focus { left: 8px; }
.wrap { width: min(100% - 2.5rem, 64rem); margin-inline: auto; }

/* ── Bar ─────────────────────────────────────────────────────────────── */
.bar { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.86); backdrop-filter: saturate(180%) blur(10px); border-bottom: 1px solid var(--line); }
.bar-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; font-size: 1.0625rem; letter-spacing: -0.02em; }
.bar-actions { display: flex; align-items: center; gap: 1.25rem; }

.link { color: var(--ink-2); font-weight: 500; font-size: 0.9375rem; white-space: nowrap; transition: color 150ms var(--ease); }
.link:hover { color: var(--ink); }
.link-lg { font-size: 1rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; height: 38px; padding: 0 1rem;
  border-radius: var(--r); background: var(--ink); color: #fff; font: inherit; font-size: 0.9375rem; font-weight: 600;
  line-height: 1; border: 0; cursor: pointer; white-space: nowrap;
  transition: background-color 150ms var(--ease), transform 150ms var(--ease);
}
.btn:hover { background: #000; }
.btn:active { transform: translateY(1px); }
.btn-lg { height: 46px; padding: 0 1.25rem; font-size: 1rem; }
.btn[disabled] { opacity: 0.6; cursor: progress; }

/* ── Hero ────────────────────────────────────────────────────────────── */
.hero { padding: clamp(4rem, 11vw, 8rem) 0 clamp(3rem, 7vw, 5rem); }
h1 {
  font-size: clamp(2.625rem, 7vw, 5rem); line-height: 1.0; letter-spacing: -0.045em; font-weight: 600;
  max-width: 16ch;
}
.lede { margin-top: 1.5rem; font-size: clamp(1.0625rem, 1.6vw, 1.25rem); color: var(--ink-3); max-width: 44ch; }
.actions { display: flex; align-items: center; gap: 1.5rem; margin-top: 2rem; flex-wrap: wrap; }

.page {
  margin: clamp(3.5rem, 8vw, 6rem) 0 0; padding: 1.5rem 1.75rem 1.5rem;
  width: min(100%, 30rem); border: 1px solid var(--line-2); border-radius: var(--r-lg); background: #fff;
  box-shadow: 0 24px 50px -30px rgba(11, 11, 12, 0.25), 0 1px 2px rgba(11, 11, 12, 0.04);
  position: relative;
}
.page-top { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.page-title { font-size: 0.9375rem; font-weight: 600; color: var(--ink); letter-spacing: -0.01em; }
.page-done { display: inline-flex; align-items: center; gap: 6px; font-size: 0.75rem; font-weight: 600; color: var(--accent); }
.page-lines { display: grid; gap: 8px; margin-top: 1.25rem; }
.page-lines span { height: 6px; border-radius: 999px; background: var(--line); }
.page-lines span:nth-child(1) { width: 88%; } .page-lines span:nth-child(2) { width: 96%; }
.page-lines span:nth-child(3) { width: 72%; } .page-lines span:nth-child(4) { width: 90%; }
.page-lines span:nth-child(5) { width: 54%; }
.page-sign { margin-top: 1.75rem; padding-top: 0.875rem; border-top: 1px solid var(--ink); }
.sig { display: grid; gap: 2px; }
.sig-name { font-size: 0.9375rem; font-weight: 600; color: var(--ink); font-style: italic; line-height: 1.2; }
.sig-meta { font-size: 0.75rem; color: var(--ink-4); }
.page figcaption { position: absolute; right: 1.75rem; bottom: 1.25rem; font-size: 0.6875rem; color: var(--ink-4); }

/* The one motion: the signature lands. */
@keyframes land { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }
@keyframes pop { from { opacity: 0; transform: translateY(2px); } to { opacity: 1; transform: none; } }
.sig { animation: land 500ms var(--ease) 400ms both; }
.page-done { animation: pop 350ms var(--ease) 1000ms both; }
@media (prefers-reduced-motion: reduce) {
  .sig, .page-done { animation: none; }
}

/* ── Promises ────────────────────────────────────────────────────────── */
.promises { padding: clamp(3rem, 7vw, 5.5rem) 0; border-top: 1px solid var(--line); }
.promises ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2rem; }
@media (min-width: 760px) { .promises ol { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 3rem; } }
.promises h2 { font-size: 1.25rem; letter-spacing: -0.025em; font-weight: 600; }
.promises p { margin-top: 0.5rem; color: var(--ink-3); max-width: 30ch; }
.aside { margin-top: 3rem; font-size: 0.9375rem; color: var(--ink-4); }

/* ── Fact ────────────────────────────────────────────────────────────── */
.fact { padding: clamp(2.5rem, 5vw, 3.5rem) 0; border-top: 1px solid var(--line); }
.fact p { font-size: 0.9375rem; color: var(--ink-3); letter-spacing: 0.005em; }

/* ── Demo ────────────────────────────────────────────────────────────── */
.demo { padding: clamp(3.5rem, 8vw, 6rem) 0 clamp(4rem, 9vw, 7rem); border-top: 1px solid var(--line); }
.demo-grid { display: grid; gap: 2.5rem; }
@media (min-width: 860px) { .demo-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 5rem; align-items: start; } }
.demo h2 { font-size: clamp(1.75rem, 3.4vw, 2.25rem); letter-spacing: -0.035em; font-weight: 600; }
.demo p { margin-top: 1rem; color: var(--ink-3); max-width: 40ch; }

.form { display: grid; gap: 1.125rem; }
.field { display: grid; gap: 6px; }
.field > span { font-size: 0.8125rem; font-weight: 500; color: var(--ink); }
.field input {
  width: 100%; font: inherit; font-size: 0.9375rem; color: var(--ink);
  padding: 0.625rem 0.75rem; border: 1px solid var(--line-2); border-radius: var(--r); background: #fff;
  transition: border-color 150ms var(--ease), box-shadow 150ms var(--ease);
}
.field input:focus { outline: none; border-color: var(--ink); box-shadow: 0 0 0 3px rgba(11, 11, 12, 0.06); }
.field.is-invalid input { border-color: var(--danger); }
.field-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 0.875rem; color: var(--ink-3); }
.consent input { width: 16px; height: 16px; margin: 4px 0 0; accent-color: var(--ink); flex: none; }
.form-foot { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: 0.25rem; }
.form-status { font-size: 0.9375rem; color: var(--ink-3); min-height: 1.5em; }
.form-status.is-ok { color: var(--ink); font-weight: 500; }
.form-status.is-error { color: var(--danger); }
.form.is-sent .form-foot .btn { display: none; }

/* ── Footer ──────────────────────────────────────────────────────────── */
.foot { border-top: 1px solid var(--line); padding: 1.75rem 0 2.5rem; font-size: 0.875rem; color: var(--ink-4); }
.foot-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.75rem; }
.foot-brand { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 600; }
.foot a { color: var(--ink-3); }
.foot a:hover { color: var(--ink); }
.foot a:last-child { margin-left: auto; }