/* LeanMarx one-pager — neutral minimal. Slate + white, gradient is the only accent (SPEC §3). */
:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --slate: #1e293b;
  --focus: #6b21a8; /* purple — center of the bias gradient */
  --maxw: 960px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }
code { background: var(--bg-alt); padding: 1px 6px; border-radius: 4px; font-size: 0.9em; }
a { color: inherit; }

/* Header */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 18px 24px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; text-decoration: none; }
.site-nav { display: flex; gap: 22px; }
.site-nav a { color: var(--ink-soft); text-decoration: none; font-size: 15px; }
.site-nav a:hover { color: var(--ink); }

/* Sections */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; border-top: 1px solid var(--line); }
.section--alt {
  background: var(--bg-alt);
  max-width: none; margin: 0 calc(50% - 50vw); padding-left: 24px; padding-right: 24px;
}
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section h2 { font-size: 28px; margin: 0 0 8px; }
.section-lede { color: var(--ink-soft); max-width: 64ch; margin: 0 0 28px; }

/* Hero */
.hero { padding: 72px 0 56px; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); margin: 0 0 18px; max-width: 18ch; }
.lede { font-size: 19px; color: var(--ink-soft); max-width: 60ch; margin: 0 0 28px; }
.lede strong { color: var(--ink); }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-note { margin-top: 18px; color: var(--ink-soft); font-size: 14px; }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 10px;
  font-weight: 600; font-size: 15px; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: transform .05s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--slate); color: #fff; }
.btn--primary:hover { box-shadow: 0 4px 14px rgba(15, 23, 42, 0.25); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink-soft); }

/* The scale strip */
.scale-strip { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 24px; }
.scale-legend {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 6px 24px;
  color: var(--ink-soft); font-size: 14px;
}
.scale-legend b { color: var(--ink); display: inline-block; width: 1.4em; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; }
.step { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
.step-num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%; background: var(--slate); color: #fff;
  font-weight: 700; margin-bottom: 12px;
}
.step h3 { margin: 0 0 6px; font-size: 18px; }
.step p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* Access form */
.access-form { max-width: 520px; display: grid; gap: 16px; }
.field { display: grid; gap: 6px; }
.field label { font-weight: 600; font-size: 14px; }
.field input, .field textarea {
  font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px;
  background: #fff; color: var(--ink); width: 100%;
}
.field input:focus, .field textarea:focus { outline: 2px solid var(--focus); outline-offset: 1px; border-color: var(--focus); }
.field input.invalid, .field textarea.invalid { border-color: #b91c1c; }
.field-hint { margin: 0; font-size: 13px; color: var(--ink-soft); min-height: 1em; }
.field-hint.ok { color: #15803d; }
.form-status { margin: 4px 0 0; font-size: 14px; min-height: 1.2em; }
.form-status.ok { color: #15803d; }
.form-status.err { color: #b91c1c; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 24px; padding: 32px 24px; }
.site-footer > * { max-width: var(--maxw); margin: 0 auto; }
.site-footer .fine { color: var(--ink-soft); font-size: 13px; }
.phase-tag { font-style: italic; }

@media (max-width: 560px) {
  .site-nav { display: none; }
  .section { padding: 48px 0; }
}