/* Alcedo — alcedo.email
   Adwaita-adjacent typographic layout. One teal accent taken from the app icon. */

/* ---------- tokens ---------- */

:root {
  color-scheme: light dark;

  --font-ui: "Adwaita Sans", "Cantarell", system-ui, -apple-system, "Segoe UI",
    "Noto Sans", sans-serif;
  --font-mono: "Adwaita Mono", "Source Code Pro", ui-monospace, "DejaVu Sans Mono",
    monospace;

  --measure: 68rem;
  --measure-prose: 42rem;
  --radius: 12px;
  --radius-sm: 8px;

  /* light (Adwaita light) */
  --bg: #fafafb;
  --bg-raised: #ffffff;
  --bg-sunken: #f2f2f4;
  --fg: #1b1b1d;
  --fg-dim: #56565c;
  --fg-faint: #78787f;
  --line: rgba(0, 0, 0, 0.11);
  --line-faint: rgba(0, 0, 0, 0.06);

  --accent: #0d7f7c;
  --accent-hover: #0a6260;
  --accent-wash: rgba(13, 146, 142, 0.09);

  --caution: #8a5200;
  --caution-wash: rgba(239, 134, 0, 0.08);
  --caution-line: rgba(239, 134, 0, 0.38);
}

@media (prefers-color-scheme: dark) {
  :root {
    /* dark (Adwaita dark) */
    --bg: #1d1d20;
    --bg-raised: #26262a;
    --bg-sunken: #17171a;
    --fg: #f1f1f4;
    --fg-dim: #b6b6be;
    --fg-faint: #90909a;
    --line: rgba(255, 255, 255, 0.13);
    --line-faint: rgba(255, 255, 255, 0.07);

    --accent: #5fd3cd;
    --accent-hover: #8ee5e0;
    --accent-wash: rgba(95, 211, 205, 0.12);

    --caution: #f0b45c;
    --caution-wash: rgba(240, 180, 92, 0.09);
    --caution-line: rgba(240, 180, 92, 0.32);
  }
}

/* ---------- reset ---------- */

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.021em;
  line-height: 1.14;
  text-wrap: balance;
}

p {
  margin: 0;
  text-wrap: pretty;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

img,
svg {
  max-width: 100%;
}

/* ---------- links ---------- */

a {
  color: var(--accent);
  text-decoration-color: color-mix(in srgb, var(--accent) 42%, transparent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-hover);
  text-decoration-color: currentColor;
}

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10;
  padding: 0.7rem 1.1rem;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
}

/* ---------- shell ---------- */

.wrap {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2.5rem);
}

.masthead {
  border-bottom: 1px solid var(--line-faint);
}

.masthead__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.75rem;
  padding-block: 1.15rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-right: auto;
  color: var(--fg);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand img {
  width: 28px;
  height: 28px;
  border-radius: 6.5px;
  display: block;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.4rem;
  list-style: none;
  font-size: 0.9688rem;
}

.nav a {
  color: var(--fg-dim);
  font-weight: 500;
  text-decoration: none;
}

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

.nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.32em;
}

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

main {
  display: block;
}

.section {
  padding-block: clamp(3.25rem, 8vw, 5.5rem);
  border-bottom: 1px solid var(--line-faint);
}

.section:last-of-type {
  border-bottom: 0;
}

/* a band that carries one short statement, not a whole topic */
.section--tight {
  padding-block: clamp(2rem, 4vw, 2.75rem);
  border-bottom: 0;
}

.section__head {
  max-width: var(--measure-prose);
  margin-bottom: 2.5rem;
}

.eyebrow {
  margin-bottom: 1rem;
  color: var(--fg-faint);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 1.9rem);
}

h3 {
  font-size: 1.0938rem;
  letter-spacing: -0.008em;
}

.lede {
  margin-top: 1rem;
  color: var(--fg-dim);
  font-size: 1.125rem;
}

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

.hero {
  padding-block: clamp(3.5rem, 11vw, 7rem) clamp(3rem, 7vw, 4.75rem);
  border-bottom: 1px solid var(--line-faint);
}

.hero h1 {
  max-width: 30ch;
  font-size: clamp(2.1rem, 6vw, 3.5rem);
  letter-spacing: -0.03em;
}

.hero__sub {
  max-width: 54ch;
  margin-top: 1.6rem;
  color: var(--fg-dim);
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  margin-top: 2rem;
  color: var(--fg-faint);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  list-style: none;
}

.hero__meta li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.hero__meta li + li::before {
  content: "";
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--fg-faint);
  opacity: 0.6;
}

/* still water, one strike */
.rule {
  display: block;
  width: 100%;
  max-width: 30rem;
  height: 26px;
  margin-top: 2.75rem;
  color: var(--accent);
}

/* ---------- buttons ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem;
  margin-top: 2.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.72rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg);
}

.btn--primary:hover {
  background: var(--accent-hover);
  color: var(--bg);
}

.btn--quiet {
  border-color: var(--line);
  background: var(--bg-raised);
  color: var(--fg);
}

.btn--quiet:hover {
  border-color: var(--fg-faint);
  color: var(--fg);
}

/* ---------- notes ---------- */

.note {
  max-width: var(--measure-prose);
  padding: 1.15rem 1.35rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--accent-wash);
  color: var(--fg-dim);
  font-size: 0.9688rem;
}

.note strong {
  color: var(--fg);
}

.note--caution {
  border-left-color: var(--caution-line);
  background: var(--caution-wash);
}

.note--caution strong {
  color: var(--caution);
}

/* ---------- capability grid ---------- */

.grid {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  background: var(--line-faint);
  overflow: hidden;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
}

.cap {
  padding: 1.75rem 1.6rem;
  background: var(--bg);
}

.cap__no {
  display: block;
  margin-bottom: 0.9rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.cap p {
  margin-top: 0.55rem;
  color: var(--fg-dim);
  font-size: 0.9688rem;
}

/* ---------- prose ---------- */

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

.prose > * + * {
  margin-top: 1.15rem;
}

.prose h2 {
  margin-top: 3rem;
}

.prose h3 {
  margin-top: 2.25rem;
  font-size: 1.1875rem;
}

.prose ul,
.prose ol {
  padding-left: 1.35rem;
}

.prose li + li {
  margin-top: 0.55rem;
}

.prose li::marker {
  color: var(--fg-faint);
}

/* ---------- definition list of defaults ---------- */

.defaults {
  max-width: 52rem;
  margin: 0;
  border-top: 1px solid var(--line);
}

.defaults > div {
  display: grid;
  gap: 0.35rem 2rem;
  padding-block: 1.15rem;
  border-bottom: 1px solid var(--line-faint);
}

@media (min-width: 46rem) {
  .defaults > div {
    grid-template-columns: 1fr auto;
    align-items: baseline;
  }
}

.defaults dt {
  font-weight: 600;
}

.defaults dd {
  margin: 0;
  color: var(--fg-dim);
  font-size: 0.9375rem;
}

.defaults dd.state {
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.defaults dd.state b {
  display: inline-block;
  padding: 0.16rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-sunken);
  font-weight: 600;
}

.defaults dd.state b.on {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  background: var(--accent-wash);
  color: var(--accent);
}

/* ---------- code ---------- */

code {
  padding: 0.12em 0.36em;
  border: 1px solid var(--line-faint);
  border-radius: 5px;
  background: var(--bg-sunken);
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.code {
  position: relative;
  max-width: var(--measure-prose);
  margin-top: 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
}

.code pre {
  margin: 0;
  padding: 1.15rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.65;
  tab-size: 2;
}

.code pre code {
  padding: 0;
  border: 0;
  background: none;
  font-size: inherit;
}

.code__copy {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  padding: 0.32rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg-raised);
  color: var(--fg-dim);
  font-family: var(--font-ui);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  opacity: 0;
  transition: opacity 120ms ease, color 120ms ease;
}

.code:hover .code__copy,
.code__copy:focus-visible {
  opacity: 1;
}

.code__copy:hover {
  color: var(--fg);
}

/* ---------- 3-pane diagram ---------- */

.figure {
  margin: 0;
}

.figure__frame {
  padding: clamp(1rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-raised);
  color: var(--fg);
}

.figure__frame svg {
  display: block;
  width: 100%;
  height: auto;
}

.figure figcaption {
  margin-top: 1rem;
  color: var(--fg-faint);
  font-size: 0.9062rem;
}

/* ---------- steps ---------- */

.steps {
  counter-reset: step;
  max-width: var(--measure-prose);
  list-style: none;
}

.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 3.25rem;
}

.steps > li + li {
  margin-top: 2.75rem;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -0.15rem;
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 50%;
  background: var(--accent-wash);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
}

.steps h3 + p,
.steps h3 + .code {
  margin-top: 0.75rem;
}

.steps p {
  color: var(--fg-dim);
  font-size: 0.9688rem;
}

.steps p + p,
.steps .code + p {
  margin-top: 0.75rem;
}

/* ---------- flag table ---------- */

.flags {
  width: 100%;
  max-width: var(--measure-prose);
  margin-top: 1.5rem;
  border-collapse: collapse;
  font-size: 0.9375rem;
  text-align: left;
}

.flags caption {
  margin-bottom: 0.85rem;
  color: var(--fg-faint);
  font-size: 0.9062rem;
  text-align: left;
}

.flags th,
.flags td {
  padding: 0.7rem 1rem 0.7rem 0;
  border-bottom: 1px solid var(--line-faint);
  vertical-align: top;
}

.flags thead th {
  border-bottom: 1px solid var(--line);
  color: var(--fg-faint);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.flags tbody th {
  font-family: var(--font-mono);
  font-size: 0.8438rem;
  font-weight: 500;
  white-space: nowrap;
}

.flags td {
  color: var(--fg-dim);
}

/* ---------- footer ---------- */

.foot {
  padding-block: 2.75rem 3.5rem;
  border-top: 1px solid var(--line);
}

.foot__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 1rem 2rem;
}

.foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-right: auto;
  list-style: none;
  font-size: 0.9375rem;
}

.foot__note {
  color: var(--fg-faint);
  font-size: 0.875rem;
}

/* ---------- 404 ---------- */

.gone {
  display: grid;
  align-content: center;
  min-height: 58vh;
  padding-block: clamp(3rem, 10vw, 6rem);
}

.gone__code {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.gone h1 {
  margin-top: 1rem;
  font-size: clamp(1.9rem, 5vw, 2.75rem);
}

.gone p {
  max-width: 42ch;
  margin-top: 1.1rem;
  color: var(--fg-dim);
  font-size: 1.0938rem;
}