/* Tokens, reset, the top bar, buttons, the shared section scaffold, the closing
   call to action and the footer. Device mockups live in device.css; each band
   has its own file. The page is light first; product surfaces (terminal, PWA)
   stay dark in both themes and use the --d-* tokens. */

:root {
  color-scheme: light dark;
  --page: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #eceef2;
  --ink: #0b0e13;
  --ink-2: #2a313c;
  /* 5.9:1 on --page. */
  --muted: #505967;
  /* 4.77:1 on --page, 5.15:1 on --surface. */
  --faint: #656e7c;
  --line: rgba(11, 14, 19, 0.09);
  --line-strong: rgba(11, 14, 19, 0.16);
  /* 5.0:1 on --page. */
  --blue: #2563d9;
  --blue-wash: rgba(47, 111, 236, 0.09);
  /* 5.1:1 on the attention tag wash. */
  --amber: #935a00;
  --green: #16884d;
  --btn: #0b0e13;
  --btn-ink: #ffffff;
  --glow: rgba(47, 111, 236, 0.16);
  --shadow-device: 0 50px 80px -40px rgba(11, 14, 19, 0.55), 0 18px 30px -18px rgba(11, 14, 19, 0.35);
  --band: #0b0e13;
  --band-2: #12161d;
  --band-ink: #e9edf3;
  --band-muted: #9aa5b4;
  --band-line: rgba(233, 237, 243, 0.1);

  --d-bg: #0a0c10;
  --d-term: #0b0e13;
  --d-dock: #0d1117;
  --d-surface: #12161d;
  --d-surface-2: #1a2029;
  --d-ink: #e9edf3;
  --d-term-ink: #dfe5ee;
  --d-muted: #9aa5b4;
  --d-faint: #737e8d;
  --d-accent: #6ea8fe;
  --d-accent-ink: #081018;
  --d-warn: #ffb224;
  --d-ok: #46d68c;
  --d-line: rgba(233, 237, 243, 0.09);

  --sans: "Geist", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --ease: cubic-bezier(0.32, 0.72, 0, 1);
  --max: 1200px;
  --gutter: clamp(16px, 4.5vw, 48px);
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #07090d;
    --surface: #10141a;
    --surface-2: #181d25;
    --ink: #e9edf3;
    --ink-2: #c9d1dc;
    --muted: #9aa5b4;
    --faint: #737e8d;
    --line: rgba(233, 237, 243, 0.08);
    --line-strong: rgba(233, 237, 243, 0.16);
    --blue: #6ea8fe;
    --blue-wash: rgba(110, 168, 254, 0.12);
    --amber: #ffb224;
    --green: #46d68c;
    --btn: #e9edf3;
    --btn-ink: #0b0e13;
    --glow: rgba(61, 123, 253, 0.22);
    --shadow-device: 0 50px 80px -40px rgba(0, 0, 0, 0.9), 0 0 0 1px rgba(233, 237, 243, 0.06);
    --band: #0d1117;
    --band-2: #151a22;
  }
}

* {
  box-sizing: border-box;
}

/* Layout rules like `display: flex` outrank the UA sheet, so state toggled from
   JS needs the attribute to win. */
[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

main {
  overflow-x: clip;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

img {
  max-width: 100%;
  display: block;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1,
h2 {
  text-wrap: balance;
}

code {
  font-family: var(--mono);
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 8px;
}

::selection {
  background: rgba(47, 111, 236, 0.25);
}

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 40;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--btn);
  color: var(--btn-ink);
}

.skip:focus {
  top: 12px;
}

.wrap {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.nw {
  display: inline-block;
  white-space: nowrap;
}

/* Progress fill shared by the hero beats and the feature tour. */
@keyframes fill {
  to {
    width: 100%;
  }
}

/* ---------- top bar ---------- */
.site-bar {
  position: sticky;
  top: 0;
  z-index: 30;
  padding-top: env(safe-area-inset-top, 0px);
  background: color-mix(in srgb, var(--page) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}

.bar-in {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.brand .mark {
  width: 28px;
  height: 28px;
}

.site-nav {
  display: flex;
  gap: 26px;
  font-size: 14.5px;
  color: var(--muted);
}

.site-nav a:hover {
  color: var(--ink);
}

.bar-end {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
}

.bar-lang {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border-radius: 999px;
  background: var(--surface-2);
}

.lang-btn {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
}

.lang-btn[aria-current="page"] {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1px 2px rgba(11, 14, 19, 0.12);
}

.bar-github {
  display: inline-flex;
  width: 20px;
  height: 20px;
  color: var(--ink-2);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  white-space: nowrap;
  transition: transform 0.2s var(--ease), opacity 0.2s;
}

.btn:active {
  transform: scale(0.97);
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-dark {
  background: var(--btn);
  color: var(--btn-ink);
}

.btn-dark:hover {
  opacity: 0.88;
}

.btn-line {
  border: 1px solid var(--line-strong);
  background: var(--surface);
}

.btn-line:hover {
  border-color: var(--ink);
}

.bar-cta {
  height: 38px;
  padding: 0 16px;
  font-size: 14px;
}

/* Computer visitors install first; phone visitors open the PWA. Both CTAs stay
   in the DOM and only visibility swaps. */
.cta-phone {
  display: none !important;
}

@media (max-width: 720px) {
  .cta-desk {
    display: none !important;
  }

  a.cta-phone,
  .btn.cta-phone {
    display: inline-flex !important;
  }

  p.cta-phone,
  div.cta-phone {
    display: block !important;
  }
}

/* ---------- section scaffold: every section answers one visitor question ---------- */
.sec {
  padding-block: clamp(64px, 7.5vw, 112px);
}

.sec-alt {
  background: var(--surface);
  border-block: 1px solid var(--line);
}

.sec-head {
  display: grid;
  gap: 16px;
  max-width: 860px;
  margin-bottom: clamp(40px, 5vw, 64px);
}

.sec-head-center {
  max-width: 920px;
  margin-inline: auto;
  justify-items: center;
  text-align: center;
}

.ask {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 600;
}

.ask::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.sec-head h2 {
  font-size: clamp(32px, 4.2vw, 54px);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.sec-head p {
  font-size: 18px;
  color: var(--muted);
  max-width: 36em;
}

/* Declared after `.sec-head p` on purpose: same element, and the kicker keeps its colour. */
.sec-head .ask {
  font-size: 14px;
  color: var(--blue);
}

/* ---------- closing call to action ---------- */
.close {
  padding-block: clamp(64px, 8vw, 112px);
  text-align: center;
  border-top: 1px solid var(--line);
  background: radial-gradient(700px 320px at 50% 100%, var(--glow), transparent 70%);
}

.close h2 {
  font-size: clamp(34px, 5vw, 64px);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.close p {
  margin-top: 16px;
  color: var(--muted);
  font-size: 17px;
}

.close .cmd {
  margin: 32px auto 0;
  max-width: 560px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 8px 8px 18px;
  border-radius: 16px;
  background: var(--d-term);
  text-align: left;
  box-shadow: var(--shadow-device);
}

.close .cmd code {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
  color: var(--d-ink);
  font-size: 14px;
}

.close .cmd code::-webkit-scrollbar {
  display: none;
}

.close .cmd .copy {
  height: 36px;
  padding: 0 16px;
  font-size: 13px;
}

.close .then {
  font-size: 15px;
}

.close .then b {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--ink);
}

.close .close-open {
  margin-top: 20px;
}

/* ---------- footer ---------- */
.foot {
  border-top: 1px solid var(--line);
  padding-block: 28px calc(28px + env(safe-area-inset-bottom, 0px));
  font-size: 13.5px;
  color: var(--faint);
}

.foot-in {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  align-items: center;
}

.foot-nav {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.foot-nav a:hover {
  color: var(--ink);
}

@media (max-width: 1040px) {
  .site-nav {
    display: none;
  }
}

@media (max-width: 760px) {
  .bar-end {
    gap: 10px;
  }

  .bar-end .bar-github {
    display: none;
  }

  .sec-head h2 {
    font-size: 28px;
  }

  /* Keep-together phrases are wider than a phone in English. */
  .nw {
    white-space: normal;
  }

  .foot-nav {
    margin-left: 0;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}