/* NuVa site. Tokens from docs/design-system/tokens.json: Lead (chumbo) by default,
   Aluminium when the system is light. The display is always dark, as in the app. */

@font-face {
  font-family: "Inter";
  src: url("/fonts/Inter.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/IBMPlexMono-Light.woff2") format("woff2");
  font-weight: 300;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

:root {
  color-scheme: dark light;
  --surface-0: #1E2023;
  --surface-1: #2B2D30;
  --surface-2: #36393D;
  --display: #141517;
  --display-ink: #E8E6E1;
  --display-muted: #8E8C87;
  --display-track: #2E3033;
  --ink: #E8E6E1;
  --ink-muted: #A6A49F;
  --line: #44474B;
  --key-face: #C9C6BF;
  --key-mode: #6B6E73;
  --key-play: #E0A93E;
  --key-ink: #1E2023;
  --key-mode-ink: #F8F7F4;
  --led: #E0A93E;
  --led-off: #3A3D41;
  --signal: #E0A93E;
  --danger: #EE7A72;
  --focus: #8FB4E3;

  --sans: "Inter", -apple-system, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --radius-sm: 3px;
  --shadow-display: inset 0 1px 0 rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: light) {
  :root {
    --surface-0: #E4E3E0;
    --surface-1: #F2F1EE;
    --surface-2: #FFFFFF;
    --ink: #1E2023;
    --ink-muted: #55575B;
    --line: #CFCDC8;
    --key-face: #7E7C77;
    --key-mode: #3A3D41;
    --key-play: #AE7410;
    --key-ink: #0E0F10;
    --key-mode-ink: #E8E6E1;
    --led: #AE7410;
    --led-off: #CFCDC8;
    --signal: #845A0D;
    --danger: #B0362E;
    --focus: #2F6DB5;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--surface-0);
  color: var(--ink);
  font: 400 17px/1.55 var(--sans);
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: inherit; text-decoration-color: var(--line); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: var(--radius-sm); }

.skip {
  position: absolute; left: var(--space-4); top: -100px;
  background: var(--surface-1); padding: var(--space-2) var(--space-3);
}
.skip:focus { top: var(--space-4); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 var(--space-4); }
.narrow { max-width: 720px; }

/* Header */
.top {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  padding-top: var(--space-6); padding-bottom: var(--space-6);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 600; font-size: 20px; }
.brand img { width: 32px; height: 32px; }
.top nav { display: flex; gap: var(--space-4); font-size: 15px; color: var(--ink-muted); flex-wrap: wrap; justify-content: flex-end; }
.top nav a { text-decoration: none; }
.top nav a:hover { color: var(--ink); }
@media (max-width: 560px) { .top nav a[href^="#"] { display: none; } }

/* Hero */
.hero { padding-top: 48px; padding-bottom: 24px; text-align: center; }
h1 {
  font-size: clamp(34px, 6vw, 56px); line-height: 1.08; font-weight: 600; letter-spacing: -0.02em;
  margin: 0 auto var(--space-4); max-width: 14em;
}
.lede { font-size: clamp(18px, 2.2vw, 21px); color: var(--ink-muted); max-width: 36em; margin: 0 auto 32px; }

/* Keys: flat faces, no outline, as on a Braun calculator */
.keys { display: flex; justify-content: center; gap: var(--space-6); flex-wrap: wrap; }
.group { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; }
.led { width: 4px; height: 4px; border-radius: 50%; background: var(--led-off); margin-left: 6px; }
.led.on { background: var(--led); }
.key {
  display: inline-flex; align-items: center; gap: var(--space-2);
  height: 44px; padding: 0 20px; border: 0; border-radius: var(--radius-sm);
  font: 500 16px/1 var(--sans); text-decoration: none; cursor: pointer;
  transition: transform 60ms, filter 60ms;
}
.key:active { transform: translateY(1px); filter: brightness(0.85); }
.key.play { background: var(--key-play); color: var(--key-ink); }
.key.mode { background: var(--key-mode); color: var(--key-mode-ink); }
.key svg { width: 18px; height: 18px; flex: none; }
.legend { font-size: 12px; color: var(--ink-muted); text-transform: lowercase; margin-left: 2px; }
.meta { font: 400 13px/1.5 var(--mono); color: var(--ink-muted); margin-top: var(--space-6); }

.shot { margin: 40px auto 0; }
.shot img { display: block; width: 100%; height: auto; }

/* Sections */
section { padding: 56px 0; }
h2 { font-size: clamp(26px, 3.4vw, 34px); line-height: 1.15; font-weight: 600; letter-spacing: -0.01em; margin: 0 0 var(--space-4); }
h3 { font-size: 18px; line-height: 1.3; font-weight: 600; margin: 0 0 6px; }
p { margin: 0 0 var(--space-4); }
.muted { color: var(--ink-muted); }
.label {
  font: 400 12px/1 var(--sans); color: var(--ink-muted); text-transform: lowercase;
  display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-3);
}
.label::before { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--led); }

.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 48px; }
.features p { color: var(--ink-muted); margin: 0; }
@media (max-width: 720px) { .features { grid-template-columns: 1fr; gap: 28px; } }

/* The display: always dark, recessed into the chassis */
.display {
  background: var(--display); color: var(--display-ink); box-shadow: var(--shadow-display);
  border-radius: var(--radius-sm); padding: 20px 24px;
  font: 400 14px/1.6 var(--mono);
}
.display .dim { color: var(--display-muted); }
.display .dot { color: var(--led); }

.split { display: grid; grid-template-columns: 5fr 7fr; gap: 48px; align-items: center; }
.split > * { min-width: 0; }
.split img { display: block; width: 100%; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; gap: 24px; } }
.split ul { margin: 0; padding: 0; list-style: none; color: var(--ink-muted); }
.split li { padding-left: 16px; position: relative; margin-bottom: 6px; }
.split li::before { content: ""; position: absolute; left: 0; top: 0.7em; width: 4px; height: 4px; border-radius: 50%; background: var(--led); }

/* FAQ */
.faq details { border-top: 1px solid var(--line); padding: var(--space-4) 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 500; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: var(--space-4); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--ink-muted); }
.faq details[open] summary::after { content: "−"; }
.faq details p { color: var(--ink-muted); margin: var(--space-3) 0 0; }
code, kbd { font-family: var(--mono); font-size: 0.88em; }
pre { background: var(--display); color: var(--display-ink); padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm); overflow-x: auto; box-shadow: var(--shadow-display); }

/* Feedback form */
form { display: grid; gap: var(--space-4); }
label { display: grid; gap: 6px; font-size: 15px; font-weight: 500; }
label small { font-weight: 400; color: var(--ink-muted); }
input, textarea {
  font: 400 16px/1.5 var(--sans); color: var(--display-ink);
  background: var(--display); box-shadow: var(--shadow-display);
  border: 0; border-radius: var(--radius-sm); padding: 10px 12px; width: 100%;
}
textarea { min-height: 140px; resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--display-muted); }
.hp { position: absolute; left: -9999px; }
.note { font-size: 14px; color: var(--ink-muted); margin: 0; }
.status { font: 400 14px/1.5 var(--mono); min-height: 1.5em; margin: 0; }
.status.error { color: var(--danger); }
form .key { justify-self: start; }

/* Legal page */
.prose h2 { font-size: 24px; margin-top: 40px; }
.prose h3 { margin-top: 24px; }
.prose ul { padding-left: 20px; color: var(--ink-muted); }
.prose p { color: var(--ink-muted); }
.prose strong { color: var(--ink); font-weight: 500; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: 14px; color: var(--ink-muted); }
footer .wrap { display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; }
footer nav { display: flex; gap: var(--space-4); flex-wrap: wrap; }

@media (prefers-reduced-motion: reduce) { .key { transition: none; } }