/* ==========================================================================
   PayPress — main.css
   Design tokens, base/reset, layout, typography, buttons, nav, footer.
   Load order: main.css → components.css → docs.css (docs pages only)
   ========================================================================== */

/* ---------- DESIGN TOKENS ---------- */
:root {
  /* Brand */
  --color-primary:        #4F46E5;
  --color-primary-dark:   #4338CA;
  --color-primary-light:  #6366F1;
  --color-primary-200:    #A5B4FC;
  --color-primary-tint:   #EEF0FE;

  /* Neutrals */
  --color-ink:            #0E1525;
  --color-ink-soft:       #1B2540;
  --color-muted:          #5B6478;
  --color-muted-2:        #8A92A6;
  --color-line:           #E7E9F1;
  --color-canvas:         #F6F7FB;
  --color-paper:          #FFFFFF;

  /* Semantic */
  --color-success:        #1F8A5B;
  --color-success-tint:   #E6F4EC;
  --color-warning:        #B45309;
  --color-warning-tint:   #FBF1E3;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  /* Type scale (fluid) */
  --fs-hero: clamp(38px, 5.2vw, 62px);
  --fs-h1:   clamp(30px, 3.6vw, 46px);
  --fs-h2:   clamp(24px, 2.6vw, 32px);
  --fs-lead: clamp(17px, 1.4vw, 20px);
  --fs-body: 17px;

  /* Spacing scale */
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 64px;
  --space-9: 96px;

  /* Radius */
  --radius-sm: 10px; --radius: 14px; --radius-lg: 20px; --radius-xl: 28px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(14,21,37,.04), 0 1px 3px rgba(14,21,37,.06);
  --shadow:    0 1px 0 rgba(14,21,37,.02), 0 18px 40px -24px rgba(14,21,37,.22);
  --shadow-lg: 0 30px 60px -28px rgba(14,21,37,.30), 0 12px 24px -16px rgba(14,21,37,.16);

  /* Layout */
  --container-max: 1200px;
  --container-pad: 28px;
  --nav-height: 70px;
}

/* ---------- RESET / BASE ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
h1, h2, h3, h4 { margin: 0; font-weight: 800; line-height: 1.08; letter-spacing: -0.03em; text-wrap: balance; }
p { margin: 0; }
::selection { background: var(--color-primary-tint); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 4px; }

/* ---------- LAYOUT ---------- */
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 var(--container-pad); }
.section { padding: var(--space-9) 0; }
.section--sm { padding: var(--space-8) 0; }
.section--tint { background: var(--color-canvas); }
.section--ink { background: var(--color-ink); color: #fff; }
.u-center { text-align: center; }
.u-prose  { max-width: 760px; }

/* ---------- TYPOGRAPHY UTILITIES ---------- */
.eyebrow {
  font-family: var(--font-mono); font-size: 13px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-primary);
  display: inline-flex; align-items: center; gap: 9px;
}
.eyebrow::before { content: ""; width: 22px; height: 1.5px; background: var(--color-primary-200); }
.eyebrow--plain::before { display: none; }

.h-hero { font-size: var(--fs-hero); }
.h-1 { font-size: var(--fs-h1); }
.h-2 { font-size: var(--fs-h2); }
.lead { font-size: var(--fs-lead); line-height: 1.55; color: var(--color-muted); }

.section-kicker {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--color-muted-2); text-align: center;
  margin-bottom: var(--space-5);
}

.section-head { max-width: 680px; margin: 0 auto var(--space-8); text-align: center; }
.section-head .eyebrow { margin-bottom: 18px; }
.section-head h2 { margin-bottom: 16px; }

.mono-accent { font-family: var(--font-mono); color: var(--color-primary); }

/* ---------- BADGES & PILLS ---------- */
.badge {
  display: inline-flex; align-items: center; font-size: 12px; font-weight: 600;
  padding: 4px 10px; border-radius: var(--radius-pill); font-family: var(--font-mono); letter-spacing: .02em;
}
.badge--green  { color: var(--color-success); background: var(--color-success-tint); }
.badge--amber  { color: var(--color-warning); background: var(--color-warning-tint); }
.badge--indigo { color: var(--color-primary); background: var(--color-primary-tint); }

.pill-row { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600;
  color: var(--color-ink-soft); background: var(--color-paper); border: 1px solid var(--color-line);
  border-radius: var(--radius-pill); padding: 9px 16px; box-shadow: var(--shadow-sm);
}
.pill__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--color-primary-light); }

/* ---------- BUTTONS ---------- */
.btn {
  font-weight: 600; font-size: 16px; cursor: pointer; border: 0; line-height: 1;
  border-radius: 12px; padding: 14px 24px; display: inline-flex; align-items: center; gap: 9px;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
  white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn--primary {
  background: var(--color-primary); color: #fff;
  box-shadow: 0 1px 2px rgba(67,56,202,.4), 0 10px 24px -12px rgba(79,70,229,.6);
}
.btn--primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); }
.btn--primary svg { transition: transform .2s ease; }
.btn--primary:hover svg { transform: translateX(3px); }
.btn--ghost {
  background: var(--color-paper); color: var(--color-ink);
  border: 1px solid var(--color-line); box-shadow: var(--shadow-sm);
}
.btn--ghost:hover { border-color: var(--color-primary-200); background: var(--color-primary-tint); color: var(--color-primary-dark); }
.btn--on-dark { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.18); }
.btn--on-dark:hover { background: rgba(255,255,255,.14); }
.btn--invert { background: #fff; color: var(--color-primary-dark); box-shadow: 0 10px 30px -12px rgba(0,0,0,.4); }
.btn--invert:hover { background: var(--color-primary-tint); transform: translateY(-1px); }
.btn--lg { padding: 16px 28px; font-size: 17px; }
.btn--sm { padding: 10px 18px; font-size: 15px; border-radius: 10px; }
.btn--block { width: 100%; justify-content: center; }

/* ---------- NAV ---------- */
.nav {
  position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.82);
  backdrop-filter: saturate(160%) blur(14px); border-bottom: 1px solid var(--color-line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: var(--nav-height); }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 20px; letter-spacing: -0.03em; }
.brand__mark { width: 32px; height: 32px; }
.nav__links { display: flex; align-items: center; gap: 32px; }
.nav__links a { font-size: 15.5px; font-weight: 500; color: var(--color-muted); transition: color .15s; }
.nav__links a:hover, .nav__links a[aria-current="page"], .nav__links a.is-active { color: var(--color-ink); }
.nav__right { display: flex; align-items: center; gap: 18px; }
.nav__signin { font-size: 15.5px; font-weight: 600; color: var(--color-ink); }
.nav__toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--color-ink); border-radius: 2px; }
.nav__toggle span + span { margin-top: 5px; }

/* ---------- FOOTER ---------- */
.footer { background: var(--color-ink); color: #fff; padding: 72px 0 36px; }
.footer__top {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 48px; border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer .brand { color: #fff; margin-bottom: 16px; }
.footer__blurb { color: rgba(255,255,255,.55); font-size: 15px; max-width: 300px; line-height: 1.6; }
.footer__col h4 {
  font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em;
  font-family: var(--font-mono); font-weight: 500; color: var(--color-primary-200); margin-bottom: 18px;
}
.footer__col a { display: block; color: rgba(255,255,255,.62); font-size: 15px; padding: 6px 0; transition: color .15s; }
.footer__col a:hover { color: #fff; }
.footer__bottom {
  display: flex; align-items: center; justify-content: space-between; padding-top: 28px;
  color: rgba(255,255,255,.45); font-size: 14px; flex-wrap: wrap; gap: 12px;
}
.footer__stripe-note { font-family: var(--font-mono); font-size: 12.5px; }

/* ---------- RESPONSIVE (base) ---------- */
@media (max-width: 920px) {
  .nav__links, .nav__signin { display: none; }
  .nav__toggle { display: block; }
  .nav.is-open .nav__links {
    display: flex; position: absolute; top: var(--nav-height); left: 0; right: 0; flex-direction: column;
    gap: 0; background: #fff; border-bottom: 1px solid var(--color-line); padding: 8px 28px 20px; align-items: flex-start;
  }
  .nav.is-open .nav__links a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--color-line); }
  .footer__top { grid-template-columns: 1fr 1fr; gap: 32px; }
  .section { padding: 72px 0; }
}
@media (max-width: 560px) {
  .footer__top { grid-template-columns: 1fr; }
}