/* ============================================================
   Battery Fitness — landing page
   Plain CSS, mobile-first. No framework, no build step.
   Tokens are copied from CLAUDE.md / brief.md — keep them in sync.
   ============================================================ */

:root {
  --base:   #0E1A2B;  /* deep charged navy — page ground, heroes */
  --raised: #14233A;  /* cards, panels */
  --charge: #FFB300;  /* electric yellow — ONE marked element per view */
  --steel:  #3B7DD8;  /* steel blue — links, supporting accents */
  --ink:    #FFFFFF;  /* near-white text on dark */
  --ink-dim: #C3CDDA; /* muted body text, still >7:1 on --base */

  --measure: 34rem;   /* comfortable line length for body copy */
  --gap:     1.5rem;
}

/* --- reset, kept to the minimum we actually need --- */
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--base);
  color: var(--ink-dim);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
}

/* Visible focus ring — the page must be keyboard-navigable. */
:focus-visible {
  outline: 3px solid var(--charge);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: 60rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}
.wrap--narrow { max-width: var(--measure); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding-block: 3.5rem 3rem;
}

.hero h1 {
  margin: 0 0 var(--gap);
  max-width: 20ch;
  color: var(--ink);
  font-size: clamp(1.9rem, 6vw, 3.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* --- the battery charge-meter: the signature motif --- */
.meter {
  display: flex;
  gap: 0.375rem;
  max-width: 18rem;
}
.seg {
  flex: 1;
  height: 0.875rem;
  border: 1px solid var(--charge);
  border-radius: 2px;
}
.seg.is-charged { background: var(--charge); }

/* ============================================================
   FOUNDER STORY
   ============================================================ */
.story {
  background: var(--raised);
  padding-block: 3rem;
}

.story h2,
.offer h2 {
  margin: 0 0 var(--gap);
  color: var(--ink);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.story p { margin: 0 0 1.25rem; }

/* ============================================================
   OFFER / CTA  (D4 session 2)
   The button is the one charge-marked element in this section:
   charge text + charge border on --base, 8.9:1. --charge is never
   a background — decided 2026-09-14.
   ============================================================ */
.offer { padding-block: 3rem; }
.offer strong { color: var(--ink); }

.signup { margin-top: 2rem; }

.signup__label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--ink);
  font-weight: 600;
}

/* Stacked by default (mobile-first); side by side once there is room. */
.signup__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.signup__input {
  flex: 1 1 14rem;
  min-width: 0;
  padding: 0.75rem 0.875rem;
  border: 1px solid var(--ink-dim);
  border-radius: 4px;
  background: var(--raised);
  color: var(--ink);
  font: inherit;
}
.signup__input::placeholder { color: var(--ink-dim); opacity: 0.7; }

.btn {
  flex: 0 0 auto;
  padding: 0.75rem 1.25rem;
  border: 2px solid var(--charge);
  border-radius: 4px;
  background: transparent;
  color: var(--charge);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.btn:hover { background: rgba(255, 179, 0, 0.12); }

.signup__note {
  margin-top: 0.75rem;
  font-size: 0.9375rem;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  padding-block: 2rem;
  border-top: 1px solid var(--raised);
  font-size: 0.875rem;
}
.site-footer p { margin: 0; }

/* Social links (V1, 10/12). Ink, not steel: steel on --base is 4.25:1,
   under AA (4.5) at footer size. */
.socials {
  display: flex;
  gap: 1.25rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}
.socials a { color: var(--ink); }