/* physiclink.io. One stylesheet, no framework, no external requests. Fonts are ours (fonts/, SIL Open Font License).
   The greens are the product's own: the badge's fill #1A7F37 and its edge #3FB950. Light and dark follow the reader. */

@font-face { font-family: "Instrument Sans"; font-style: normal; font-weight: 400 700; font-display: swap;
  src: url(/fonts/instrument-sans-latin-wght-normal.woff2) format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap;
  src: url(/fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap;
  src: url(/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2"); }

:root {
  color-scheme: light dark;
  --bg: #F4F7F4;
  --bg-2: #E9EFEA;
  --card: #FFFFFF;
  --ink: #0D1B13;
  --ink-2: #3F5147;
  --ink-3: #566A5E;
  --line: #D3DDD6;
  --accent: #14692D;
  --accent-fill: #1A7F37;
  --accent-edge: #3FB950;
  --on-accent: #FFFFFF;
  --band: #0C1F15;
  --band-ink: #EDF4EF;
  --band-ink-2: #B5C7BB;
  --band-line: #274334;
  --grey: #5C6B63;
  --grey-soft: #E4E9E5;
  --red: #B3261E;
  --red-soft: #FBE9E7;
  --green-soft: #DFF1E3;
  --shadow: 0 1px 2px rgba(13, 27, 19, .06), 0 24px 60px -24px rgba(13, 27, 19, .38);
  --sans: "Instrument Sans", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --max: 1160px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #08110C;
    --bg-2: #0D1A13;
    --card: #11211A;
    --ink: #EDF4EF;
    --ink-2: #B5C7BB;
    --ink-3: #98AC9F;
    --line: #213A2D;
    --accent: #5FD07A;
    --band: #0F241A;
    --band-line: #2A4A39;
    --grey: #A3B3A9;
    --grey-soft: #1B2B23;
    --red: #FF8A80;
    --red-soft: #2E1715;
    --green-soft: #12301F;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 24px 60px -24px rgba(0, 0, 0, .8);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent-edge); outline-offset: 3px; border-radius: 4px; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, p { margin: 0; }
h1, h2 { font-weight: 600; letter-spacing: -.022em; text-wrap: balance; }
h1 { font-size: clamp(2.5rem, 5.6vw, 4.25rem); line-height: 1.04; }
h2 { font-size: clamp(1.95rem, 3.6vw, 2.9rem); line-height: 1.1; }
h3 { font-size: 1.14rem; line-height: 1.3; font-weight: 600; letter-spacing: -.008em; }
sup { font-size: .55em; line-height: 0; vertical-align: .75em; font-weight: 500; }

.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: 24px; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 30; background: var(--ink); color: var(--bg);
  padding: 10px 14px; border-radius: 8px; }
.skip:focus { top: 12px; }

.label { font: 500 .8rem/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 16px; }
.sub { font-size: 1.14rem; line-height: 1.55; color: var(--ink-2); margin-top: 18px; max-width: 62ch; text-wrap: pretty; }

/* Top */
.top { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.top-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none;
  font-weight: 600; font-size: 1.14rem; letter-spacing: -.01em; }
.nav { display: flex; gap: 26px; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: .96rem; font-weight: 500; }
.nav a:hover { color: var(--ink); }

/* Hero */
.hero { overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); gap: 56px; align-items: center;
  padding-block: 76px 84px; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; font: 500 .82rem/1.4 var(--mono); color: var(--ink-2);
  margin-bottom: 26px; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent-edge); flex: none;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-edge) 24%, transparent); }
.lead { font-size: clamp(1.18rem, 1.9vw, 1.38rem); line-height: 1.45; margin-top: 26px; max-width: 34em; text-wrap: pretty; }
.lead-2 { font-size: 1.08rem; color: var(--ink-2); margin-top: 14px; max-width: 34em; text-wrap: pretty; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 24px;
  border-radius: 12px; font-weight: 600; text-decoration: none; border: 1px solid transparent;
  transition: background-color .15s, border-color .15s; }
.btn-main { background: var(--accent-fill); color: var(--on-accent); }
.btn-main:hover { background: #156B2E; }
.btn-quiet { color: var(--ink); border-color: var(--line); background: transparent; }
.btn-quiet:hover { border-color: var(--ink-3); }

.device { margin: 0; justify-self: center; width: min(100%, 318px); }
.device figcaption { font: 400 .76rem/1.4 var(--mono); color: var(--ink-3); text-align: center; margin-top: 16px; }
.phone { background: #060B08; padding: 9px; border-radius: 42px; box-shadow: var(--shadow); border: 1px solid #2A3A31; }
.screen { position: relative; aspect-ratio: 300 / 600; border-radius: 34px; overflow: hidden; background: #0B1510; }
.portrait { position: absolute; inset: 0; width: 100%; height: 100%; }
.frame { position: absolute; inset: 7px; border-radius: 28px; border: 3px solid var(--accent-edge);
  animation: breathe 3.4s ease-in-out infinite; }
@keyframes breathe { 50% { opacity: .55; } }
.call-top { position: absolute; left: 0; right: 0; top: 30px; display: grid; justify-items: center; gap: 7px; padding-inline: 18px; }
.pill { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-fill); color: #FFFFFF;
  border: 1px solid var(--accent-edge); border-radius: 99px; padding: 5px 13px 5px 9px; font-size: .84rem; font-weight: 600; white-space: nowrap; }
.call-line { color: #FFFFFF; font-size: .95rem; font-weight: 500; background: rgba(0, 0, 0, .46); padding: 3px 11px; border-radius: 9px; }
.call-bottom { position: absolute; left: 0; right: 0; bottom: 34px; display: flex; justify-content: center; gap: 16px; }
.round { width: 46px; height: 46px; border-radius: 50%; background: rgba(255, 255, 255, .22); }
.round-end { background: #C8362C; }

/* Dark band */
.band { background: var(--band); color: var(--band-ink); padding-block: 84px; }
.band .label { color: var(--accent-edge); }
.band .sub { color: var(--band-ink-2); }
.band-head { max-width: 760px; margin-bottom: 52px; }
.trio { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 36px; }
.trio li { border-top: 1px solid var(--band-line); padding-top: 22px; }
.trio p { color: var(--band-ink-2); margin-top: 10px; text-wrap: pretty; }

/* Sections */
.section { padding-block: 92px; }
.section-alt { background: var(--bg-2); }
.section-head { max-width: 780px; margin-bottom: 52px; }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; counter-reset: none; }
.steps li { border-top: 2px solid var(--accent-fill); padding-top: 20px; }
.step-n { display: block; font: 500 .9rem/1 var(--mono); color: var(--accent); margin-bottom: 18px; }
.steps p { color: var(--ink-2); margin-top: 10px; text-wrap: pretty; }

.states { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.state { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px; display: flex; flex-direction: column; gap: 10px; }
.state-tag { display: inline-flex; align-items: center; gap: 8px; font: 500 .78rem/1.4 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--ink-3); }
.swatch { width: 12px; height: 12px; border-radius: 50%; background: var(--grey); }
.state h3 { font-size: 1.34rem; letter-spacing: -.015em; }
.state-line { font-weight: 500; }
.state > p:last-child { color: var(--ink-2); text-wrap: pretty; }
.state-green { border-top: 4px solid var(--accent-edge); }
.state-green .swatch { background: var(--accent-edge); }
.state-grey { border-top: 4px solid var(--grey); }
.state-red { border-top: 4px solid var(--red); }
.state-red .swatch { background: var(--red); }

.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 44px 36px; }
.features li { display: flex; flex-direction: column; gap: 10px; }
.features li::before { content: ""; width: 26px; height: 3px; background: var(--accent-edge); margin-bottom: 8px; }
.features p { color: var(--ink-2); text-wrap: pretty; }

.limits-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 56px; align-items: start; }
.limits-grid .section-head { margin-bottom: 0; position: sticky; top: 100px; }
.limits li { padding-block: 20px; border-top: 1px solid var(--line); color: var(--ink-2); text-wrap: pretty; }
.limits li:last-child { border-bottom: 1px solid var(--line); }
.limits strong { color: var(--ink); font-weight: 600; display: block; margin-bottom: 4px; }

.windpost, .contact, .patents { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 48px; align-items: center; }
.windpost .btn { justify-self: end; }

.numbers { display: grid; gap: 12px; }
.numbers li { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; display: grid; gap: 3px; }
.numbers span { font-size: .9rem; color: var(--ink-3); }
.numbers b { font: 500 1.24rem/1.3 var(--mono); letter-spacing: -.01em; }

.contact-card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px; display: grid; gap: 14px; }
.mail { font: 500 1.08rem/1.3 var(--mono); overflow-wrap: anywhere; }

/* Foot */
.foot { border-top: 1px solid var(--line); padding-block: 44px; font-size: .92rem; color: var(--ink-3); }
.foot-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.foot p + p { margin-top: 6px; }
.foot-brand { display: flex; align-items: center; gap: 9px; color: var(--ink); font-weight: 600; font-size: 1.02rem; margin-bottom: 12px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; margin-bottom: 12px; }

/* The legal page and the 404 */
.page { padding-block: 72px 96px; }
.page h1 { font-size: clamp(2.2rem, 4.4vw, 3.2rem); }
.page-body { max-width: 68ch; }
.page-body h2 { font-size: 1.46rem; line-height: 1.25; margin-top: 44px; letter-spacing: -.012em; }
.page-body p, .page-body ul { color: var(--ink-2); margin-top: 12px; text-wrap: pretty; }
.page-body ul { list-style: disc; padding-left: 1.2em; }
.page-body li + li { margin-top: 6px; }
.page-body .lead { color: var(--ink); margin-top: 22px; }
.page .btn { margin-top: 30px; }

@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; padding-block: 52px 64px; }
  .trio, .steps, .states { grid-template-columns: 1fr; }
  .trio { gap: 26px; }
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .limits-grid, .windpost, .contact, .patents { grid-template-columns: 1fr; gap: 28px; }
  .limits-grid .section-head { position: static; }
  .windpost .btn { justify-self: start; }
  .band, .section { padding-block: 68px; }
}
@media (max-width: 760px) {
  .top-row { flex-wrap: wrap; padding-block: 12px; gap: 8px 20px; }
  .nav { gap: 18px; flex-wrap: wrap; }
  .nav a { font-size: .9rem; }
  html { scroll-padding-top: 112px; }
  .foot-row { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 16.5px; }
  .wrap { padding-inline: 18px; }
  .features { grid-template-columns: 1fr; gap: 32px; }
  .btn { width: 100%; }
  .actions { flex-direction: column; }
  .windpost .btn { justify-self: stretch; }
  .top { position: static; }
  html { scroll-padding-top: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .frame { animation: none; }
}