:root {
  --gutter: clamp(16px, 4.5vw, 56px);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 clamp(16px, 1.05vw + 12px, 18px) / 1.6 var(--sans);
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover {
  color: var(--accent);
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.mono {
  font-family: var(--mono);
}
.skip {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 14px;
  z-index: 10;
}
.skip:focus {
  top: 12px;
}

/* ----- top -------------------------------------------------------------- */

.top {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 20px var(--gutter);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font: 400 1.6rem/1 var(--serif);
  letter-spacing: -0.01em;
}
.top-nav {
  display: none;
  gap: 28px;
  margin-left: auto;
  font-size: 0.92rem;
}
.top-nav a {
  text-decoration: none;
}
.top .prefs {
  margin-left: auto;
}
@media (max-width: 420px) {
  .top {
    gap: 12px;
  }
}
@media (min-width: 760px) {
  .top-nav {
    display: flex;
  }
  .top-nav + .prefs {
    margin-left: 8px;
  }
}

/* ----- hero ------------------------------------------------------------- */

main {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.hero {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(12px, 3vw, 40px) 0 clamp(48px, 8vw, 110px);
}
.eyebrow {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
h1 {
  margin: 0;
  font: 400 clamp(3.4rem, 13vw, 10.5rem) / 0.9 var(--serif);
  letter-spacing: -0.025em;
  text-wrap: balance;
}
h1 em {
  color: var(--accent);
}
.lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(1.05rem, 0.6vw + 0.95rem, 1.3rem);
  color: var(--ink-2);
}

.specimen {
  margin: 0;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: clamp(16px, 2.4vw, 26px);
  display: grid;
  gap: 12px;
  min-width: 0;
}
.specimen-row {
  display: grid;
  gap: 4px;
  min-width: 0;
}
.tag {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.plain,
.cipher {
  display: block;
  font-size: clamp(0.95rem, 0.5vw + 0.85rem, 1.12rem);
  overflow-wrap: anywhere;
  min-height: 1.6em;
}
.cipher {
  /* Evenly filled lines: ciphertext has no words to keep together. */
  word-break: break-all;
}
.cipher {
  color: var(--accent);
  transition: opacity 0.3s ease;
}
.cipher.waiting {
  opacity: 0.18;
}
.specimen-rule {
  height: 1px;
  background: var(--rule);
  position: relative;
  overflow: hidden;
}
.specimen-rule span {
  position: absolute;
  inset: 0 auto 0 0;
  width: 30%;
  background: var(--accent);
  animation: travel 3.2s ease-in-out infinite;
}
@keyframes travel {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(340%);
  }
}
.specimen figcaption {
  font-size: 0.72rem;
  color: var(--ink-2);
  border-top: 1px dashed var(--rule);
  padding-top: 10px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.button {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 14px 22px;
  border: 2px solid var(--ink);
  font-weight: 600;
  text-decoration: none;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}
.button.primary {
  background: var(--ink);
  color: var(--paper);
}
.button:hover {
  color: inherit;
  transform: translate(-3px, -3px);
  box-shadow: 3px 3px 0 var(--accent);
}
.button.primary:hover {
  color: var(--paper);
}
.version {
  font-size: 0.75rem;
  font-weight: 400;
  opacity: 0.75;
}

@media (min-width: 980px) {
  .hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    column-gap: 56px;
    align-items: end;
  }
  .hero .eyebrow,
  .hero h1 {
    grid-column: 1 / -1;
  }
  .lede {
    grid-column: 1;
  }
  .specimen {
    grid-column: 2;
    grid-row: 3 / span 2;
    align-self: start;
  }
  .cta {
    grid-column: 1;
  }
}

/* ----- sections --------------------------------------------------------- */

.section {
  border-top: 1px solid var(--ink);
  padding: clamp(28px, 5vw, 64px) 0 clamp(48px, 7vw, 96px);
  scroll-margin-top: 16px;
}
.section-head {
  display: grid;
  gap: 6px;
  margin-bottom: clamp(24px, 4vw, 48px);
}
.number {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--accent);
}
h2 {
  margin: 0;
  font: 400 clamp(2.4rem, 6.5vw, 4.8rem) / 0.95 var(--serif);
  letter-spacing: -0.02em;
}
h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}
.note {
  max-width: 44em;
  color: var(--ink-2);
  font-size: 0.95rem;
}
@media (min-width: 900px) {
  .section-head {
    grid-template-columns: 140px 1fr;
    align-items: baseline;
  }
}

/* How it works */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.steps li {
  padding: 24px 0;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 10px;
  align-content: start;
}
.steps li:first-child {
  border-top: 0;
  padding-top: 0;
}
.numeral {
  display: block;
  height: clamp(3.2rem, 8vw, 5.5rem);
  font: italic 400 clamp(3.2rem, 8vw, 5.5rem) / 1 var(--serif);
  color: var(--accent);
}
.steps p {
  margin: 0;
  color: var(--ink-2);
}
.sample {
  font-size: 0.85rem;
  color: var(--ink) !important;
  overflow-wrap: anywhere;
}
@media (min-width: 900px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .steps li {
    border-top: 0;
    border-left: 1px solid var(--rule);
    padding: 0 28px;
  }
  .steps li:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

/* What the server sees */
.ledger {
  display: grid;
  border: 1px solid var(--ink);
}
.ledger-col {
  padding: clamp(18px, 3vw, 32px);
}
.ledger-col + .ledger-col {
  border-top: 1px solid var(--ink);
}
.ledger-col h3 {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin-bottom: 14px;
}
.ledger-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.ledger-col li {
  font-size: 1.02rem;
}
.redacted li span {
  display: inline;
  background: var(--redact);
  color: var(--on-redact);
  box-shadow: inset 0 0 0 1px var(--rule);
  padding: 2px 8px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  line-height: 1.9;
}
@media (min-width: 760px) {
  .ledger {
    grid-template-columns: 1fr 1fr;
  }
  .ledger-col + .ledger-col {
    border-top: 0;
    border-left: 1px solid var(--ink);
  }
}

/* Tools */
.spec {
  margin: 0;
  display: grid;
}
.spec > div {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
}
.spec > div:last-child {
  border-bottom: 1px solid var(--rule);
}
.spec dt {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.spec dd {
  margin: 0;
}
@media (min-width: 760px) {
  .spec > div {
    grid-template-columns: 220px 1fr;
    gap: 24px;
    align-items: baseline;
  }
}

/* Downloads */
.downloads {
  display: grid;
  gap: 28px;
  margin: 24px 0 8px;
}
.platform h3 {
  font: 400 1.7rem/1.1 var(--serif);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 6px;
}
.files {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
}
.files li a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}
.files li a span:first-child {
  overflow-wrap: anywhere;
}
.files li a span:last-child {
  color: var(--ink-2);
  white-space: nowrap;
}
.files li a.mine span:first-child {
  color: var(--accent);
}
.files li.empty {
  color: var(--ink-2);
  padding: 10px 0;
}
@media (min-width: 900px) {
  .downloads {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 40px;
  }
}
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
}

/* How to install: a tab for each file, and its steps (src/home.ts). */
.install-intro {
  margin: 0 0 clamp(20px, 3vw, 32px);
}
.formats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  /* The page's ink between the cells draws the lines. */
  gap: 1px;
  background: var(--ink);
  border: 1px solid var(--ink);
}
.format {
  position: relative;
  display: grid;
  gap: 6px;
  align-content: start;
  min-width: 0;
  padding: 14px 16px 16px;
  border: 0;
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    color 0.2s ease;
}
.format:last-child {
  grid-column: 1 / -1;
}
.format-name {
  font: 400 1.6rem/1 var(--serif);
  letter-spacing: -0.01em;
}
.format-for {
  font-size: 0.72rem;
  line-height: 1.4;
  color: var(--ink-2);
  transition: color 0.2s ease;
}
.format:hover {
  background: var(--paper-2);
}
.format[aria-selected="true"] {
  background: var(--ink);
  color: var(--paper);
  cursor: default;
}
.format[aria-selected="true"] .format-for {
  color: var(--paper);
  opacity: 0.75;
}
.format[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: var(--accent);
}
.format:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -5px;
}
@media (min-width: 760px) {
  .formats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .format:last-child {
    grid-column: auto;
  }
  .format {
    padding: 18px 20px 20px;
  }
}

.guide {
  display: grid;
  gap: clamp(24px, 3.5vw, 40px);
  padding: clamp(18px, 3.5vw, 40px);
  border: 1px solid var(--ink);
  border-top: 0;
  animation: guide-in 0.3s ease both;
}
.guide[hidden] {
  display: none;
}
@keyframes guide-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}
.guide-lead {
  margin: 0;
  font-size: clamp(1.05rem, 0.4vw + 0.95rem, 1.2rem);
  color: var(--ink-2);
}
/* The notes beside the steps once the longest command fits beside them. */
@media (min-width: 1080px) {
  .guide {
    grid-template-columns: minmax(0, 1fr) minmax(250px, 28%);
    column-gap: 48px;
  }
  .guide-lead {
    grid-column: 1 / -1;
  }
}

.guide-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}
.guide-step {
  position: relative;
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  column-gap: 14px;
  padding-bottom: 28px;
}
.guide-step:last-child {
  padding-bottom: 0;
}
/* The line from one step's number to the next. */
.guide-step:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 15.5px;
  top: 32px;
  bottom: 0;
  width: 1px;
  background: var(--rule);
}
.guide-number {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 500;
}
.guide-body {
  display: grid;
  gap: 10px;
  align-content: start;
  min-width: 0;
  padding-top: 4px;
}
.guide-body p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.95rem;
}
.guide-body p.guide-note {
  font-size: 0.88rem;
}
.guide code,
.after code {
  font-family: var(--mono);
  font-size: 0.88em;
}
.guide-body p code,
.guide-box code {
  padding: 1px 5px;
  background: var(--paper-2);
  color: var(--ink);
  overflow-wrap: anywhere;
}
.guide strong,
.after strong {
  font-weight: 600;
  color: var(--ink);
}
@media (min-width: 760px) {
  .guide-step {
    grid-template-columns: 36px minmax(0, 1fr);
    column-gap: 18px;
  }
  .guide-step:not(:last-child)::before {
    left: 17.5px;
    top: 36px;
  }
  .guide-number {
    width: 36px;
    height: 36px;
  }
  .guide-body {
    padding-top: 6px;
  }
}

/* The file to download. */
.guide-file {
  display: flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  max-width: 100%;
  margin-top: 2px;
  padding: 11px 14px;
  border: 1px solid var(--ink);
  font-size: 0.85rem;
  line-height: 1.35;
  text-decoration: none;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}
.guide-file:hover {
  color: inherit;
  transform: translate(-2px, -2px);
  box-shadow: 2px 2px 0 var(--accent);
}
.guide-file-name {
  min-width: 0;
  overflow-wrap: anywhere;
}
.guide-file-size {
  color: var(--ink-2);
  white-space: nowrap;
}
.guide-file.pending {
  border-style: dashed;
}
.guide svg,
.term svg {
  display: block;
  flex: none;
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.guide-file svg {
  color: var(--accent);
}

/* A terminal: dark in both themes, in the dark theme's colors. */
.term {
  --term-bg: #15171a;
  --term-ink: #ebe6da;
  --term-dim: #a19f97;
  --term-line: #2b2f34;
  --term-accent: #3fd6c2;
  min-width: 0;
  border: 1px solid var(--term-line);
  background: var(--term-bg);
  color: var(--term-ink);
}
.term-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 5px 5px 5px 14px;
  border-bottom: 1px solid var(--term-line);
}
.term-label {
  font: 400 0.72rem/1 var(--mono);
  letter-spacing: 0.06em;
  color: var(--term-dim);
}
.term-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 9px;
  vertical-align: 0.1em;
  background: var(--term-accent);
}
.term-body {
  margin: 0;
  padding: 14px 16px 16px;
  overflow-x: auto;
  font: 400 0.86rem/1.75 var(--mono);
  scrollbar-width: thin;
  scrollbar-color: var(--term-line) transparent;
}
.term-body code {
  font: inherit;
}
.term-line {
  display: block;
}
.term-prompt {
  margin-right: 1ch;
  color: var(--term-accent);
  user-select: none;
}
.copy {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 32px;
  padding: 0 11px;
  border: 1px solid var(--term-line);
  border-radius: 0;
  background: none;
  color: var(--term-ink);
  font: 500 0.72rem/1 var(--mono);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition:
    color 0.15s ease,
    border-color 0.15s ease,
    background-color 0.15s ease;
}
.copy:hover {
  border-color: var(--term-dim);
  background: #1f2327;
}
.copy:focus-visible {
  outline: 2px solid var(--term-accent);
  outline-offset: -2px;
}
.term .copy svg {
  width: 14px;
  height: 14px;
}
.copy .icon-done,
.copy.copied .icon-copy {
  display: none;
}
.copy.copied .icon-done {
  display: block;
}
.copy.copied {
  border-color: var(--term-accent);
  color: var(--term-accent);
}

/* The SmartScreen warning, sketched. */
.smartscreen {
  display: grid;
  gap: 12px;
  max-width: 400px;
  margin-top: 2px;
  padding: 16px 18px 18px;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  font-size: 0.85rem;
  line-height: 1.3;
}
.smartscreen-title {
  font: 400 1.35rem/1.1 var(--serif);
}
/* Two lines of text, as gray bars. */
.smartscreen-text {
  height: 18px;
  background:
    linear-gradient(var(--rule), var(--rule)) 0 0 / 100% 5px no-repeat,
    linear-gradient(var(--rule), var(--rule)) 0 100% / 62% 5px no-repeat;
}
.smartscreen-more {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}
.smartscreen-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
  padding-top: 4px;
}
.smartscreen-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--rule);
  color: var(--ink-2);
}
.smartscreen-button.target {
  border-color: var(--ink);
  color: var(--ink);
  font-weight: 500;
}
.smartscreen-mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 0.68rem;
  font-weight: 500;
  text-decoration: none;
}

/* Updates and good-to-know, beside the steps. */
.guide-side {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 16px 24px;
  align-items: start;
  align-content: start;
}
.guide-box {
  display: grid;
  gap: 10px;
  padding: 16px 18px 18px;
  border-top: 1px solid var(--ink);
}
.guide-box.updates {
  border-top: 0;
  background: var(--accent-soft);
}
.guide-box h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.guide-box.updates h3 {
  color: var(--ink);
}
.guide-box.updates h3 svg {
  width: 14px;
  height: 14px;
  color: var(--accent);
}
.guide-box p {
  margin: 0;
  font-size: 0.92rem;
}
.guide-box ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.guide-box li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9rem;
  color: var(--ink-2);
}
.guide-box li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--accent);
}

/* After installing. */
.after {
  display: grid;
  gap: 14px;
  margin-top: clamp(28px, 4vw, 48px);
}
.after h3 {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.after-grid {
  display: grid;
  gap: 0 40px;
}
.after-grid p {
  margin: 0;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
  color: var(--ink-2);
  font-size: 0.95rem;
}
@media (min-width: 760px) {
  .after-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ----- bottom ----------------------------------------------------------- */

.bottom {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--gutter) 32px;
  overflow: hidden;
}
.wordmark {
  margin: 0;
  font: italic 400 clamp(5rem, 27vw, 21rem) / 0.78 var(--serif);
  letter-spacing: -0.04em;
  color: var(--paper-2);
  user-select: none;
}
.bottom-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  border-top: 1px solid var(--ink);
  padding-top: 16px;
  font-size: 0.85rem;
  color: var(--ink-2);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .specimen-rule span {
    animation: none;
    width: 100%;
  }
  .button,
  .guide-file {
    transition: none;
  }
  .button:hover,
  .guide-file:hover {
    transform: none;
  }
  .guide {
    animation: none;
  }
}