/*
 * The Atlantis app's visual system on a web page: liquid glass over a night blue ground, green
 * for ready and blue for working. The tokens below are the app's own, copied from its
 * src/styles.css, and the only place a colour is written down. The type scale is the house
 * ramp the app steps down from, since a page in a browser is read at a distance the app is not.
 */

:root {
  --font:
    "Berkeley Mono", "TX-02", "Commit Mono", "JetBrains Mono", ui-monospace, "SF Mono", Menlo,
    Consolas, monospace;

  --void: #050a16;
  --lamp: #e8f0fc;
  --silver: #8398bc;
  --primary: #3df5a8;
  --secondary: #4faeff;
  --warn: #f2d24b;

  --glass:
    linear-gradient(142deg, rgba(190, 230, 255, 0.09) 0%, rgba(190, 230, 255, 0) 42%),
    linear-gradient(158deg, rgba(24, 44, 84, 0.58), rgba(9, 18, 38, 0.46));
  --glass-strong:
    linear-gradient(142deg, rgba(190, 230, 255, 0.13) 0%, rgba(190, 230, 255, 0) 46%),
    linear-gradient(158deg, rgba(28, 52, 96, 0.66), rgba(11, 22, 46, 0.54));
  --edge: rgba(125, 196, 255, 0.16);
  --edge-strong: rgba(125, 196, 255, 0.3);
  --sheen: rgba(200, 230, 255, 0.1);
  --hover: rgba(125, 196, 255, 0.08);
  --active: rgba(61, 245, 168, 0.1);
  --working: rgba(79, 174, 255, 0.12);
  --caution: rgba(242, 210, 75, 0.12);

  --glow-a: rgba(61, 245, 168, 0.26);
  --glow-b: rgba(79, 174, 255, 0.26);
  --glow-c: rgba(136, 116, 255, 0.24);
  --glow-d: rgba(242, 186, 75, 0.2);
  --title-glow: rgba(61, 245, 168, 0.32);
  --shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.85);

  --perf: 6px;
  --frame: 12px;
  --gate-sp: 20px;
  --reel: 36px;
  --act: 64px;
  --intermission: 112px;

  --head-h: 58px;
  --measure: 62ch;
  --page: 1180px;
  --blur: blur(26px) saturate(150%);
  --ease: 200ms cubic-bezier(0.4, 0, 0.2, 1);

  color-scheme: dark;
}

:root[data-theme="light"] {
  --void: #f5ede0;
  --lamp: #241e17;
  --silver: #6e6152;
  --primary: #0f6b48;
  --secondary: #1a5b87;
  --warn: #8a6516;

  --glass:
    linear-gradient(142deg, rgba(255, 255, 255, 0.55) 0%, rgba(255, 255, 255, 0) 45%),
    linear-gradient(158deg, rgba(255, 251, 244, 0.72), rgba(243, 233, 219, 0.54));
  --glass-strong:
    linear-gradient(142deg, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0) 48%),
    linear-gradient(158deg, rgba(255, 252, 246, 0.8), rgba(245, 236, 223, 0.64));
  --edge: rgba(120, 92, 58, 0.18);
  --edge-strong: rgba(120, 92, 58, 0.32);
  --sheen: rgba(255, 255, 255, 0.6);
  --hover: rgba(120, 92, 58, 0.07);
  --active: rgba(15, 107, 72, 0.09);
  --working: rgba(26, 91, 135, 0.09);
  --caution: rgba(138, 101, 22, 0.12);

  --glow-a: rgba(214, 158, 82, 0.4);
  --glow-b: rgba(150, 176, 152, 0.28);
  --glow-c: rgba(170, 146, 196, 0.3);
  --glow-d: rgba(206, 142, 92, 0.32);
  --title-glow: rgba(180, 130, 60, 0.22);
  --shadow: 0 20px 45px -25px rgba(90, 70, 45, 0.35);

  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--head-h) + var(--gate-sp));
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--void);
  color: var(--lamp);
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

p {
  margin: 0;
}

code {
  font-family: inherit;
  font-size: 0.92em;
  padding: 1px 5px;
  border: 1px solid var(--edge);
  border-radius: 5px;
  background: var(--hover);
}

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

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip {
  position: fixed;
  top: var(--frame);
  left: var(--frame);
  z-index: 40;
  padding: var(--perf) var(--frame);
  border-radius: 999px;
  background: var(--glass-strong);
  transform: translateY(-200%);
}

.skip:focus {
  transform: none;
}

/* ground */

/* Negative on purpose, as in the app: at 0 it paints over unpositioned text. */
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 52% at 10% 92%, var(--glow-a) 0%, transparent 68%),
    radial-gradient(54% 48% at 92% 6%, var(--glow-b) 0%, transparent 68%),
    radial-gradient(42% 38% at 78% 88%, var(--glow-b) 0%, transparent 72%), var(--void);
}

.ambient[data-ground="download"] {
  background:
    radial-gradient(60% 50% at 12% 100%, var(--glow-d) 0%, transparent 66%),
    radial-gradient(46% 42% at 92% 88%, var(--glow-a) 0%, transparent 70%),
    radial-gradient(50% 38% at 74% -4%, var(--glow-b) 0%, transparent 72%), var(--void);
}

.ambient[data-ground="text"] {
  background:
    radial-gradient(86% 26% at 50% -6%, var(--glow-c) 0%, transparent 68%),
    radial-gradient(70% 24% at 12% 62%, var(--glow-b) 0%, transparent 72%),
    radial-gradient(86% 28% at 50% 104%, var(--glow-c) 0%, transparent 66%), var(--void);
}

/* surfaces */

.glass {
  border: 1px solid var(--edge);
  border-radius: 20px;
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow:
    inset 0 1px 0 var(--sheen),
    var(--shadow);
}

.page {
  width: min(var(--page), 100% - 2 * var(--gate-sp));
  margin-inline: auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(15, minmax(0, 1fr));
  gap: var(--frame);
}

/* type roles */

.eyebrow {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver);
}

.title {
  margin: var(--frame) 0 0;
  font-size: clamp(32px, 5.4vw, 56px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-shadow: 0 0 40px var(--title-glow);
}

.lead {
  max-width: var(--measure);
  margin-top: var(--gate-sp);
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--silver);
}

.prose {
  max-width: var(--measure);
}

.caption {
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--silver);
}

/* controls */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--frame);
  padding: 14px 28px;
  border: 1px solid var(--edge-strong);
  border-radius: 999px;
  background: var(--active);
  box-shadow: inset 0 1px 0 var(--sheen);
  font-size: 18px;
  color: var(--lamp);
  text-decoration: none;
  white-space: nowrap;
  transition:
    border-color var(--ease),
    box-shadow var(--ease);
}

.button:hover {
  border-color: var(--primary);
  box-shadow:
    inset 0 1px 0 var(--sheen),
    0 0 28px -8px var(--primary);
}

.button svg {
  width: 20px;
  height: 20px;
}

.button-quiet {
  border-color: var(--edge);
  background: none;
  box-shadow: none;
  color: var(--silver);
}

.button-quiet:hover {
  border-color: var(--edge-strong);
  box-shadow: none;
  color: var(--lamp);
}

.button[aria-disabled="true"] {
  pointer-events: none;
  color: var(--silver);
  opacity: 0.6;
}

.link {
  color: var(--secondary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease);
}

.link:hover {
  border-color: currentColor;
}

/* Links inside text written as Markdown, a changelog line or an answer, take the same look. */
.release-highlights a,
.log-group a,
.faq a {
  color: var(--secondary);
  text-decoration: none;
}

.release-highlights a:hover,
.log-group a:hover,
.faq a:hover {
  text-decoration: underline;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--silver);
}

.chip[data-tone="ready"] {
  border-color: color-mix(in srgb, var(--primary) 40%, transparent);
  background: var(--active);
  color: var(--primary);
}

.chip[data-tone="working"] {
  border-color: color-mix(in srgb, var(--secondary) 40%, transparent);
  background: var(--working);
  color: var(--secondary);
}

.chip[data-tone="caution"] {
  border-color: color-mix(in srgb, var(--warn) 40%, transparent);
  background: var(--caution);
  color: var(--warn);
}

/* the mark, swapped by theme like the app's */

.logo {
  display: block;
  flex: none;
  width: var(--logo, 24px);
  height: var(--logo, 24px);
  background: center / contain no-repeat url("/assets/logo-dark.png");
}

:root[data-theme="light"] .logo {
  background-image: url("/assets/logo-light.png");
}

/* nav */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--head-h);
  border-bottom: 1px solid var(--edge);
  background: var(--glass);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  box-shadow: inset 0 1px 0 var(--sheen);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: var(--gate-sp);
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--frame);
  margin-right: auto;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--gate-sp);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--ease);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--lamp);
}

.nav-links a[aria-current="page"] {
  text-shadow: 0 0 18px var(--title-glow);
}

.icon-button {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--edge);
  border-radius: 999px;
  color: var(--silver);
  transition:
    color var(--ease),
    border-color var(--ease);
}

.icon-button:hover {
  border-color: var(--edge-strong);
  color: var(--secondary);
}

.icon-button svg {
  width: 18px;
  height: 18px;
}

.theme-light,
:root[data-theme="light"] .theme-dark {
  display: none;
}

:root[data-theme="light"] .theme-light {
  display: block;
}

/* hero: the app's splash, held open */

.hero {
  display: grid;
  place-items: center;
  min-height: calc(100svh - var(--head-h));
  padding: var(--act) 0 var(--intermission);
  text-align: center;
}

.hero-core {
  display: grid;
  justify-items: center;
}

.hero-mark {
  position: relative;
  width: 132px;
  height: 132px;
}

.hero-glyph {
  --logo: 132px;
  filter: drop-shadow(0 0 28px var(--title-glow));
  animation: mark-breathe 3.2s ease-in-out infinite;
}

/* Masked to the mark, not its box, so the light runs down the arch. */
.hero-scan {
  position: absolute;
  inset: 0;
  overflow: hidden;
  -webkit-mask: center / contain no-repeat url("/assets/logo-dark.png");
  mask: center / contain no-repeat url("/assets/logo-dark.png");
}

.hero-scan::before {
  content: "";
  position: absolute;
  inset: -36% 0 auto;
  height: 36%;
  background: linear-gradient(180deg, transparent, var(--primary), transparent);
  animation: scan 2.8s cubic-bezier(0.45, 0, 0.55, 1) infinite;
}

.hero-word {
  margin: var(--reel) 0 0;
  font-size: clamp(34px, 9vw, 96px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.42em;
  /* Tracking pads the last glyph too, so the indent puts the word back on centre. */
  text-indent: 0.42em;
  text-transform: uppercase;
  text-shadow: 0 0 48px var(--title-glow);
  animation: word-lock 900ms cubic-bezier(0.33, 0, 0.2, 1) both;
}

.hero .lead {
  margin-inline: auto;
  margin-top: var(--reel);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--frame);
  margin-top: var(--act);
}

.hero .caption {
  margin-top: var(--gate-sp);
}

/* sections */

.section {
  padding: var(--intermission) 0 0;
}

.section:last-of-type {
  padding-bottom: var(--intermission);
}

.section-head {
  margin-bottom: var(--act);
}

/* features: a bento of glass tiles, each with its page's mark large and faint behind it */

.tile {
  position: relative;
  display: grid;
  align-content: start;
  gap: var(--frame);
  min-height: 260px;
  padding: var(--reel);
  overflow: hidden;
}

.tile-mark {
  position: absolute;
  top: -28px;
  right: -28px;
  width: 180px;
  height: 180px;
  color: var(--secondary);
  opacity: 0.1;
  pointer-events: none;
}

.tile-head {
  display: flex;
  align-items: center;
  gap: var(--frame);
}

.tile-head svg {
  width: 22px;
  height: 22px;
  color: var(--primary);
}

.tile h3 {
  margin: var(--gate-sp) 0 0;
  font-size: 27px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.tile p {
  max-width: var(--measure);
  color: var(--silver);
}

.span-9 {
  grid-column: span 9;
}

.span-8 {
  grid-column: span 8;
}

.span-7 {
  grid-column: span 7;
}

.span-6 {
  grid-column: span 6;
}

.span-5 {
  grid-column: span 5;
}

/* principles, set straight on the ground */

.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--reel);
  margin: 0;
  padding: var(--reel) 0 0;
  border-top: 1px solid var(--edge);
  list-style: none;
}

.principles h3 {
  display: flex;
  align-items: center;
  gap: var(--frame);
  margin: 0 0 var(--frame);
  font-size: 18px;
  font-weight: 600;
}

.principles h3::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 0 12px var(--primary);
}

.principles p {
  color: var(--silver);
}

/* release */

.release {
  padding: var(--reel);
}

.release + .release {
  margin-top: var(--gate-sp);
}

.release[data-archived="true"] {
  background: none;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.release-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--frame) var(--gate-sp);
}

.release-version {
  margin: 0;
  font-size: clamp(32px, 4vw, 41px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.release-codename {
  color: var(--secondary);
}

.release-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--perf);
}

.release-date {
  margin-left: auto;
  font-size: 14px;
  color: var(--silver);
  font-variant-numeric: tabular-nums;
}

.release-notes {
  max-width: var(--measure);
  margin-top: var(--gate-sp);
  font-size: 20px;
  line-height: 1.5;
}

.release-highlights {
  display: grid;
  gap: var(--frame);
  max-width: 80ch;
  margin: var(--gate-sp) 0 0;
  padding: 0;
  list-style: none;
  color: var(--silver);
}

.release-highlights li {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
}

.release-highlights li::before {
  content: "›";
  color: var(--primary);
}

.release-asset {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--gate-sp);
  margin-top: var(--reel);
  padding-top: var(--gate-sp);
  border-top: 1px solid var(--edge);
}

.asset-label {
  display: flex;
  align-items: center;
  gap: var(--frame);
}

.asset-label svg {
  width: 28px;
  height: 28px;
  color: var(--silver);
}

.asset-label strong {
  display: block;
  font-weight: 500;
}

.release-log {
  margin-top: var(--gate-sp);
  border-top: 1px solid var(--edge);
}

.release-log summary {
  display: flex;
  align-items: center;
  gap: var(--frame);
  padding-top: var(--gate-sp);
  font-size: 14px;
  color: var(--silver);
  cursor: pointer;
  list-style: none;
  transition: color var(--ease);
}

.release-log summary::-webkit-details-marker {
  display: none;
}

.release-log summary::before {
  content: "+";
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 1px solid var(--edge);
  border-radius: 999px;
}

.release-log[open] summary::before {
  content: "−";
}

.release-log summary:hover {
  color: var(--lamp);
}

.log-group {
  margin-top: var(--reel);
}

.log-group h4 {
  margin: 0 0 var(--frame);
}

.log-group[data-type="Added"] h4 {
  color: var(--primary);
}

.log-group[data-type="Changed"] h4 {
  color: var(--secondary);
}

.log-group[data-type="Fixed"] h4,
.log-group[data-type="Security"] h4 {
  color: var(--warn);
}

.log-group ul {
  display: grid;
  gap: var(--frame);
  max-width: 80ch;
  margin: 0;
  padding-left: var(--gate-sp);
  font-size: 16px;
  color: var(--silver);
}

.log-group li::marker {
  color: var(--edge-strong);
}

.empty {
  padding: var(--act) var(--reel);
  text-align: center;
}

.empty .lead {
  margin-inline: auto;
}

/* requirements and install, two glass panels side by side */

.facts {
  margin-top: var(--act);
}

.facts .glass {
  padding: var(--reel);
}

.facts h2 {
  margin: var(--frame) 0 var(--gate-sp);
  font-size: 27px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.facts ol,
.facts ul {
  display: grid;
  gap: var(--frame);
  margin: 0;
  padding-left: var(--gate-sp);
  color: var(--silver);
}

.facts li::marker {
  color: var(--primary);
}

/* faq */

.faq {
  display: grid;
  gap: var(--frame);
}

.faq details {
  padding: 0 var(--reel);
  border-radius: 16px;
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gate-sp);
  padding: var(--gate-sp) 0;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  flex: none;
  color: var(--silver);
  transition: transform var(--ease);
}

.faq details[open] summary::after {
  transform: rotate(45deg);
  color: var(--primary);
}

.faq details p {
  max-width: var(--measure);
  padding-bottom: var(--gate-sp);
  color: var(--silver);
}

/* text pages */

.doc {
  max-width: 80ch;
  padding: var(--act) 0 var(--intermission);
}

.doc h2 {
  margin: var(--act) 0 var(--frame);
  font-size: 27px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.doc p,
.doc ul {
  max-width: var(--measure);
  color: var(--silver);
}

.doc p + p {
  margin-top: var(--frame);
}

.doc strong {
  color: var(--lamp);
  font-weight: 600;
}

.doc ul {
  display: grid;
  gap: var(--perf);
  margin: var(--frame) 0 0;
  padding-left: var(--gate-sp);
}

.summary {
  margin-top: var(--reel);
  padding: var(--reel);
}

.summary p {
  color: var(--lamp);
}

/* footer */

.footer {
  border-top: 1px solid var(--edge);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--gate-sp);
  padding: var(--reel) 0;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--frame);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gate-sp);
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  font-size: 14px;
  color: var(--silver);
  text-decoration: none;
  transition: color var(--ease);
}

.footer-links a:hover {
  color: var(--lamp);
}

/* reveal */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition:
    opacity 600ms cubic-bezier(0.33, 0, 0.2, 1),
    transform 600ms cubic-bezier(0.33, 0, 0.2, 1);
}

.reveal[data-shown="true"] {
  opacity: 1;
  transform: none;
}

@keyframes mark-breathe {
  0%,
  100% {
    opacity: 0.82;
  }
  50% {
    opacity: 1;
  }
}

@keyframes scan {
  0% {
    transform: translateY(0);
    opacity: 0;
  }
  15%,
  85% {
    opacity: 1;
  }
  100% {
    transform: translateY(370%);
    opacity: 0;
  }
}

@keyframes word-lock {
  from {
    opacity: 0;
    letter-spacing: 0.9em;
  }
  to {
    opacity: 1;
    letter-spacing: 0.42em;
  }
}

/* Each loop is stopped by name. A blanket short duration turns a loop into a strobe. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero-glyph,
  .hero-word {
    animation: none;
  }

  .hero-scan {
    display: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (max-width: 960px) {
  .span-9,
  .span-8,
  .span-7,
  .span-6,
  .span-5 {
    grid-column: span 15;
  }

  .principles {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  :root {
    --intermission: 80px;
    --gate-sp: 16px;
  }

  body {
    font-size: 16px;
  }

  .nav-links .nav-optional {
    display: none;
  }

  .brand-word {
    display: none;
  }

  .hero-word {
    letter-spacing: 0.3em;
    text-indent: 0.3em;
    animation: none;
  }

  .tile,
  .release,
  .facts .glass,
  .summary {
    padding: var(--gate-sp);
  }

  .faq details {
    padding: 0 var(--gate-sp);
  }

  .release-date {
    margin-left: 0;
  }

  .hero-actions .button,
  .release-asset .button {
    width: 100%;
  }
}