/* ChargeState — chargestate.app
   Daylight instrument-panel design system (Direction A: cool/clean).
   White page, dark ink, one deep-teal accent. The hero shows a real app
   screenshot (img/charging.png) inside a minimal device frame.

   Contrast (WCAG AA, checked numerically):
     --text  #14181c on #ffffff  17.8:1   on --panel  16.6:1
     --muted #4d5a64 on #ffffff   7.1:1   on --panel   6.6:1
     --amp   #087161 on #ffffff   5.9:1   on --panel   5.5:1 */

:root {
  --bg: #ffffff;            /* page background */
  --panel: #f5f7f9;         /* raised panel surface, cool gray */
  --panel-2: #eef1f4;       /* brighter panel / hover */
  --line: #dde3e8;          /* hairline borders */
  --text: #14181c;          /* primary ink — 17.8:1 on --bg */
  --muted: #4d5a64;         /* secondary ink — 7.1:1 on --bg */
  --amp: #087161;           /* deep electric teal — 5.9:1 on --bg */
  --amp-dim: rgba(8, 113, 97, 0.08);
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius: 14px;
  --space: clamp(1rem, 3vw, 1.75rem);
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Type ---------- */

h1, h2, h3 { line-height: 1.15; margin: 0 0 0.5em; letter-spacing: -0.015em; }
h1 { font-size: clamp(2.4rem, 7vw, 3.75rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 4vw, 2.1rem); font-weight: 700; }
h3 { font-size: 1.125rem; font-weight: 650; }
p  { margin: 0 0 1em; }

a { color: var(--amp); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--amp);
  outline-offset: 3px;
  border-radius: 4px;
}

.num, .readout {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.muted { color: var(--muted); }

.kicker {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amp);
  margin: 0 0 0.75rem;
}

/* ---------- Layout ---------- */

.wrap {
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 var(--space);
}

section { padding: clamp(3rem, 8vw, 5.5rem) 0; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--amp);
  color: #ffffff;
  padding: 0.5rem 1rem;
  z-index: 10;
}
.skip-link:focus { left: 0; }

/* ---------- Header / nav ---------- */

header.site {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 750;
  font-size: 1.125rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand .tick {
  font-family: var(--mono);
  color: var(--amp);
  font-weight: 400;
}
nav.site ul {
  display: flex;
  gap: clamp(0.9rem, 3vw, 1.75rem);
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
nav.site a { color: var(--muted); font-size: 0.9375rem; }
nav.site a:hover { color: var(--text); text-decoration: none; }

/* ---------- Hero ---------- */

.hero .wrap {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
@media (min-width: 52rem) {
  .hero .wrap { grid-template-columns: 1.1fr 0.9fr; }
}

.hero .tagline {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--muted);
  max-width: 32ch;
}

.compat {
  display: inline-block;
  margin-top: 1.25rem;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--muted);
  background: var(--panel);
}

.appstore-note {
  margin-top: 1.5rem;
  font-size: 0.9375rem;
  color: var(--muted);
}

/* ---------- Phone (real app screenshot in a device frame) ---------- */

.phone {
  justify-self: center;
  width: min(280px, 78vw);
  border-radius: 38px;
  overflow: hidden;
  background: #14181c;
  box-shadow:
    0 0 0 6px #14181c,
    0 24px 60px rgba(20, 32, 40, 0.28),
    0 4px 16px rgba(20, 32, 40, 0.16);
  line-height: 0;
}
.phone img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: inherit;
}

/* ---------- Feature groups ---------- */

.features { border-top: 1px solid var(--line); }

.feature-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}
@media (min-width: 40rem)  { .feature-grid { grid-template-columns: repeat(2, 1fr); } }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card h3 { display: flex; align-items: baseline; gap: 0.6rem; }
.card h3 .idx {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--amp);
  font-weight: 400;
}
.card ul {
  margin: 0.75rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.9688rem;
}
.card li { margin-bottom: 0.4rem; }
.card li::marker { color: var(--amp); }

/* ---------- What you need ---------- */

.needs { border-top: 1px solid var(--line); }
.needs-list {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}
@media (min-width: 40rem) { .needs-list { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Privacy promise ---------- */

.privacy-promise { border-top: 1px solid var(--line); }
.promise-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--amp);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 4vw, 2.25rem);
  margin-top: 2rem;
}
.promise-box p:last-child { margin-bottom: 0; }

/* ---------- Prose pages (privacy, support) ---------- */

main.prose { padding: clamp(2.5rem, 7vw, 4.5rem) 0; }
main.prose .wrap { max-width: 44rem; }
main.prose h2 { margin-top: 2.25em; font-size: 1.375rem; }
main.prose ul { padding-left: 1.2rem; }
main.prose li { margin-bottom: 0.5rem; }
main.prose li::marker { color: var(--amp); }
.updated {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--muted);
}

/* ---------- Footer ---------- */

footer.site {
  border-top: 1px solid var(--line);
  padding: 2.5rem 0 3rem;
  font-size: 0.9375rem;
  color: var(--muted);
}
footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  align-items: baseline;
}
footer.site nav ul {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--text); }