/* ---------- Fonts ---------- */

@font-face {
  font-family: Sans;
  src: url(fonts/InterVariable.woff2) format("woff2");
  font-display: swap;
  font-weight: 100 900;
}

@font-face {
  font-family: "Sans Fallback";
  src: local("Arial");
  ascent-override: 89.79%;
  descent-override: 22.36%;
  line-gap-override: 0%;
  size-adjust: 107.89%;
}

/* ---------- Tokens (Radix Sand scale) ---------- */

:root {
  --gray-100: #fdfdfc;
  --gray-200: #f9f9f8;
  --gray-300: #f1f0ef;
  --gray-400: #e9e9e7;
  --gray-500: #e2e1de;
  --gray-600: #dad9d6;
  --gray-700: #cfceca;
  --gray-800: #bcbbb5;
  --gray-900: #8d8d86;
  --gray-1000: #82827c;
  --gray-1100: #63635e;
  --gray-1200: #21201c;

  --label: var(--gray-1200);
  --item-hover: #f5f4f4;
  --form-bg: #fff;
  --form-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08), 0 2px 2px rgba(0, 0, 0, 0.04);
  --form-ring: 0 0 0 2px rgba(0, 0, 0, 0.2);
  --btn-hover: rgba(33, 32, 28, 0.9);

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --gray-100: #111110;
    --gray-200: #191918;
    --gray-300: #222221;
    --gray-400: #2a2a28;
    --gray-500: #31312e;
    --gray-600: #3b3a37;
    --gray-700: #494844;
    --gray-800: #62605b;
    --gray-900: #6f6d66;
    --gray-1000: #7c7b74;
    --gray-1100: #b5b3ad;
    --gray-1200: #eeeeec;

    --label: #fff;
    --item-hover: var(--gray-200);
    --form-bg: #0b0b09;
    --form-shadow: 0 0 0 1px hsla(0, 0%, 100%, 0.08), 0 1px 2px rgba(0, 0, 0, 0.08);
    --form-ring: 0 0 0 2px hsla(0, 0%, 100%, 0.2);
    --btn-hover: rgba(238, 238, 236, 0.9);

    color-scheme: dark;
  }
}

/* ---------- Base ---------- */

*,
::before,
::after {
  box-sizing: border-box;
  border-width: 0;
  border-style: solid;
  border-color: var(--gray-400);
}

html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  margin: 0;
  font-family: Sans, "Sans Fallback", sans-serif;
  font-feature-settings: "cv01", "ss03";
  font-variation-settings: "opsz" auto;
  font-size: 16px;
  line-height: inherit;
  background: var(--gray-100);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--gray-500);
}

p {
  margin: 0;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: underline;
  text-underline-position: from-font;
  text-decoration-thickness: 0.08em;
  text-decoration-color: var(--gray-800);
}

a:hover {
  text-decoration-color: var(--gray-900);
}

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

input {
  font: inherit;
  color: inherit;
  margin: 0;
}

svg {
  display: block;
}

.muted {
  color: var(--gray-1100);
}

.block {
  display: block;
}

.mt-4 {
  margin-top: 16px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ---------- Layout ---------- */

.layout-root {
  isolation: isolate;
  margin: 0 auto;
  max-width: 692px;
  overflow-x: hidden;
  padding: 48px 24px;
  color: var(--gray-1200);
}

@media (min-width: 640px) {
  .layout-root {
    padding-top: 128px;
    padding-bottom: 128px;
  }
}

@media (min-width: 768px) {
  .layout-root {
    overflow-x: visible;
    padding-top: 64px;
    padding-bottom: 64px;
  }
}

.site-header {
  margin-bottom: 128px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-name {
  display: inline-block;
  font-weight: 500;
  text-decoration: none;
  color: var(--label);
}

.site-role {
  font-weight: 500;
  line-height: 1;
  color: var(--gray-1100);
}

/* ---------- Sections ---------- */

.section-label {
  display: block;
  margin-bottom: 20px;
  font-weight: 500;
  color: var(--label);
}

@media (min-width: 640px) {
  .section-label {
    margin-bottom: 24px;
  }
}

.list-section {
  margin-top: 64px;
  margin-bottom: -12px;
}

.newsletter-section {
  margin-top: 64px;
  padding-bottom: 4px;
}

.more-section {
  margin-top: 64px;
}

@media (min-width: 640px) {
  .list-section,
  .newsletter-section,
  .more-section {
    margin-top: 128px;
  }

  .list-label {
    margin-bottom: 16px;
  }
}

.list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.item {
  margin: 0 -12px;
  display: flex;
  flex-direction: column;
  border-radius: 6px;
  padding: 0 12px;
  text-decoration: none;
}

.item:hover {
  background: var(--item-hover);
}

@media (min-width: 640px) {
  .list {
    gap: 16px;
  }

  .item {
    padding-top: 12px;
    padding-bottom: 12px;
  }
}

/* ---------- Newsletter ---------- */

.newsletter {
  margin-top: 24px;
  display: flex;
  height: 48px;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  overflow: hidden;
  border-radius: 9999px;
  background: var(--form-bg);
  box-shadow: var(--form-shadow);
}

.newsletter:focus-within {
  box-shadow: var(--form-ring), var(--form-shadow);
}

.newsletter input {
  height: 100%;
  width: 40%;
  flex-grow: 1;
  border: none;
  background: transparent;
  padding: 0 14px;
  transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1);
}

.newsletter input::placeholder {
  color: var(--gray-900);
}

.newsletter input:focus {
  outline: none;
}

.newsletter button {
  margin-right: 5px;
  height: 38px;
  width: 100px;
  flex: none;
  border-radius: 9999px;
  background: var(--gray-1200);
  padding: 0 6px;
  font-weight: 500;
  color: var(--gray-100);
  outline: none;
  transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1);
}

.newsletter button:hover {
  background: var(--btn-hover);
}

.newsletter button:active {
  transform: scale(0.97);
}

.newsletter button:focus-visible {
  box-shadow:
    0 0 0 2px var(--gray-100),
    0 0 0 4px var(--gray-1100);
}

@media (min-width: 768px) {
  .newsletter button {
    width: 104px;
    padding: 0 14px;
  }
}

/* Label morph (Subscribe -> You're in!) */
.newsletter button span {
  display: block;
  transition:
    opacity 150ms cubic-bezier(0.23, 1, 0.32, 1),
    transform 150ms cubic-bezier(0.23, 1, 0.32, 1),
    filter 150ms cubic-bezier(0.23, 1, 0.32, 1);
}

.newsletter button span.morph-out {
  opacity: 0;
  transform: translateY(-10px);
  filter: blur(2px);
}

.newsletter button span.morph-in {
  opacity: 0;
  transform: translateY(10px);
  filter: blur(2px);
  transition: none;
}

/* ---------- Article (post pages) ---------- */

@font-face {
  font-family: serifInline;
  src: url(/fonts/NewsreaderItalic.woff2) format("woff2");
  font-display: swap;
  font-weight: 200 800;
  font-style: italic;
}

@font-face {
  font-family: Mono;
  src: url(/fonts/GeistMono.woff2) format("woff2");
  font-display: swap;
  font-weight: 100 900;
}

.article {
  margin-bottom: 64px;
}

.article p {
  margin: 0 0 26px;
  opacity: 0.9;
}

.article em {
  font-family: serifInline, Georgia, serif;
  font-size: 0.98em;
  font-style: italic;
  font-weight: 400;
}

.article a {
  color: var(--gray-1000);
  text-decoration-thickness: 1px;
}

.article .h-anchor {
  display: block;
  width: fit-content;
  margin: 48px 0 20px;
  color: inherit;
  text-decoration: none;
  text-decoration-thickness: 1.5px;
}

.article .h-anchor:hover {
  text-decoration-line: underline;
}

.article h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 550;
  line-height: 24px;
  color: var(--label);
}

@media (min-width: 768px) {
  .article .h-anchor {
    margin-top: 56px;
  }
}

.article ul {
  list-style: none;
  margin: -16px 0 26px;
  padding: 0;
}

.article li {
  display: flex;
  gap: 6px;
  opacity: 0.9;
}

.article li + li {
  margin-top: 8px;
}

.article li::before {
  content: "-";
}

.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  color: #000;
}

.arrow-link svg {
  width: 16px;
  height: 16px;
  transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1);
}

@media (hover: hover) and (pointer: fine) {
  .arrow-link:hover svg {
    transform: translateX(2px);
  }
}

@media (prefers-color-scheme: dark) {
  .arrow-link {
    color: #fff;
  }
}

/* homepage: sits under the Writing list, lighter than the section label above it */
.list-section .arrow-link {
  display: flex;
  width: fit-content;
  margin: 28px 0 12px;
  font-weight: 400;
  color: var(--gray-1100);
  text-decoration: none;
}

.list-section .arrow-link:hover {
  color: var(--label);
}

@media (min-width: 640px) {
  .list-section .arrow-link {
    margin-top: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .arrow-link svg {
    transition: none;
  }
}

.article :not(pre) > code {
  font-family: Mono, ui-monospace, monospace;
  font-size: 13.72px;
  background: var(--gray-200);
  border-radius: 6px;
  padding: 2px 3.6px;
}

/* ---------- Demo cards ---------- */

demo-transition,
demo-speed,
demo-toast,
demo-morph,
demo-scalein,
demo-loop {
  display: block;
}

.demo {
  position: relative;
  margin: 32px 0 35px;
  border-top: 1px solid var(--gray-400);
  border-bottom: 1px solid var(--gray-400);
  border-radius: 12px;
  background: #fff;
}

.demo-stage {
  display: flex;
  width: 100%;
  padding: 24px 16px;
  align-items: center;
  justify-content: center;
  gap: 40px;
}

.article p.demo-caption {
  margin: -20px 0 32px;
  opacity: 1;
  text-align: center;
  font-size: 12px;
  line-height: 16px;
  color: var(--gray-1000);
}

/* ---------- Code blocks ---------- */

.code-block {
  position: relative;
  margin: 24px 0;
}

.code-block pre {
  margin: 0;
  overflow: auto;
  max-height: 332px;
  border-top: 1px solid var(--gray-400);
  border-bottom: 1px solid var(--gray-400);
  border-radius: 12px;
  background: #fff;
  padding: 24px 0 16px;
}

.code-block code {
  display: grid;
  gap: 2px;
  font-family: Mono, ui-monospace, monospace;
  font-size: 13px;
  line-height: 16px;
}

.code-block .line {
  padding: 0 16px;
}

:root {
  --tok-str: #23863a;
  --tok-kw: #d63848;
  --tok-fn: #7142c2;
  --tok-num: #ad5700;
}

.tok-str { color: var(--tok-str); }
.tok-kw { color: var(--tok-kw); }
.tok-fn { color: var(--tok-fn); }
.tok-num { color: var(--tok-num); }
.tok-com { color: var(--gray-1000); }
.tok-attr { color: var(--gray-1100); }

@media (prefers-color-scheme: dark) {
  :root {
    --tok-str: #86e99f;
    --tok-kw: #f97784;
    --tok-fn: #b593f0;
    --tok-num: #d19a66;
  }

  .demo,
  .code-block pre {
    background: #11110e;
  }
}

@media (min-width: 640px) {
  .demo,
  .code-block pre {
    border-top: none;
    border-bottom: none;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08), 0 2px 2px rgba(0, 0, 0, 0.04);
  }

  .demo-stage {
    border-radius: 12px;
  }
}

@media (min-width: 640px) and (prefers-color-scheme: dark) {
  .demo,
  .code-block pre {
    box-shadow: inset 0 0 0 1px hsla(0, 0%, 100%, 0.07);
  }
}

@media (max-width: 639.98px) {
  .demo,
  .code-block {
    margin-left: -25px;
    margin-right: -25px;
    width: calc(100% + 50px);
    border-radius: 0;
  }

  .code-block pre {
    border-radius: 0;
  }
}

@media (min-width: 768px) {
  .code-block {
    margin: 28px 0 32px;
  }
}

/* ---------- Demo internals ---------- */

.pill-dark {
  border-radius: 9999px;
  background: #171717;
  padding: 8px 24px;
  font-weight: 500;
  color: #fff;
  user-select: none;
  -webkit-user-select: none;
}

.pill-dark:hover {
  background: #383838;
}

.pill-dark.eased {
  transition: background-color 200ms ease;
}

.pill-white {
  border-radius: 9999px;
  background: var(--gray-100);
  padding: 8px 24px;
  font-weight: 500;
  color: var(--gray-1200);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08), 0 2px 2px rgba(0, 0, 0, 0.04);
  user-select: none;
  -webkit-user-select: none;
}

.demo-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 16px;
  width: 164px;
}

.demo-menu {
  width: 164px;
  border-radius: 10px;
  background: var(--gray-100);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08), 0px 4px 8px -4px rgba(0, 0, 0, 0.04), 0px 16px 24px -8px rgba(0, 0, 0, 0.06);
  padding: 4px;
  transform-origin: bottom center;
  transform: scale(0.95);
  opacity: 0;
}

.demo-menu.open {
  transform: scale(1);
  opacity: 1;
}

.demo-menu div {
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 14px;
  line-height: 20px;
  color: var(--gray-1200);
}

.demo-menu div:hover {
  background: var(--gray-300);
}

.demo-toast-viewport {
  position: absolute;
  bottom: 24px;
  left: 50%;
  width: 300px;
  transform: translateX(-50%);
}

.demo-toast-item {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  border-radius: 8px;
  background: var(--gray-100);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08), 0px 4px 12px rgba(0, 0, 0, 0.1);
  padding: 12px 16px;
  font-size: 13px;
  line-height: 16px;
  color: var(--gray-1200);
  transition: transform 400ms cubic-bezier(0.21, 1.02, 0.73, 1), opacity 400ms cubic-bezier(0.21, 1.02, 0.73, 1);
}

.morph-button {
  position: relative;
  display: flex;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--gray-400);
  background: var(--gray-100);
  padding: 0 12px;
  font-weight: 500;
  font-size: 14px;
  width: 110px;
  transition: width 300ms cubic-bezier(0.175, 0.885, 0.32, 1.1);
}

.morph-button span {
  display: block;
  white-space: nowrap;
  transition: opacity 150ms cubic-bezier(0.23, 1, 0.32, 1), transform 150ms cubic-bezier(0.23, 1, 0.32, 1), filter 150ms cubic-bezier(0.23, 1, 0.32, 1);
}

.morph-button span.morph-out {
  opacity: 0;
  transform: translateY(-10px);
  filter: blur(2px);
}

.morph-button span.morph-in {
  opacity: 0;
  transform: translateY(10px);
  filter: blur(2px);
  transition: none;
}

.scalein {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.scalein-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 220px; /* stat text swaps must never move layout */
}

.scalein-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.scalein-title {
  font-weight: 600;
  font-size: 13px;
  color: var(--label);
}

.scalein-stat {
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--gray-1000);
}

.scalein-sessions {
  display: flex;
  gap: 6px;
}

.scalein-hosts {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.scalein-host {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  border-radius: 8px;
  background-color: var(--gray-300);
  border: 1px dashed transparent;
  padding: 6px;
  transition: background-color 260ms ease, border-color 260ms ease;
}

/* terminated host = reclaimed capacity: fill fades, dashed outline stays in place */
.scalein-host.scalein-reclaimed {
  background-color: transparent;
  border-color: var(--gray-800);
}

.scalein-host-label {
  font-size: 10px;
  color: var(--gray-1000);
  transition: opacity 260ms ease;
}

.scalein-reclaimed .scalein-host-label {
  opacity: 0.5;
}

.scalein-host-sessions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: 50px;
}

.scalein-box {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 1px solid var(--gray-1200);
  background: var(--gray-100);
  transform-origin: center;
  transition: transform 220ms cubic-bezier(0.16, 1, 0.3, 1), opacity 220ms cubic-bezier(0.16, 1, 0.3, 1);
}

.scalein-box.scalein-exit {
  transform: scale(0.9) translateY(3px);
  opacity: 0;
  transition: transform 200ms cubic-bezier(0.4, 0, 1, 1), opacity 200ms cubic-bezier(0.4, 0, 1, 1);
}

.scalein-btn {
  width: 136px;
  transition: transform 160ms ease-out, width 300ms cubic-bezier(0.175, 0.885, 0.32, 1.1);
}

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

.scalein-btn span {
  display: block;
  white-space: nowrap;
  transition: opacity 150ms cubic-bezier(0.23, 1, 0.32, 1), transform 150ms cubic-bezier(0.23, 1, 0.32, 1), filter 150ms cubic-bezier(0.23, 1, 0.32, 1);
}

.scalein-btn span.morph-out {
  opacity: 0;
  transform: translateY(-10px);
  filter: blur(2px);
}

.scalein-btn span.morph-in {
  opacity: 0;
  transform: translateY(10px);
  filter: blur(2px);
  transition: none;
}

.loop {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.loop-state {
  font-family: Mono, ui-monospace, monospace;
  font-size: 13px;
  font-weight: 500;
  color: var(--label);
  font-variant-numeric: tabular-nums;
}

.loop-rules {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 304px;
}

.loop-rule {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: Mono, ui-monospace, monospace;
  font-size: 12px;
  line-height: 16px;
  color: var(--gray-1000);
  padding: 4px 10px;
  border-radius: 6px;
  transition: background-color 160ms ease, color 160ms ease;
}

.loop-rule span {
  white-space: nowrap;
}

.loop-rule.loop-scan {
  background-color: var(--gray-200);
}

.loop-rule.loop-fired {
  background-color: var(--gray-200);
  color: var(--label);
}

.loop-saw {
  font-size: 12px;
  color: var(--gray-1000);
  font-variant-numeric: tabular-nums;
}

.loop-state span,
.loop-saw span {
  display: block;
  white-space: nowrap;
  transition: opacity 150ms cubic-bezier(0.23, 1, 0.32, 1), transform 150ms cubic-bezier(0.23, 1, 0.32, 1), filter 150ms cubic-bezier(0.23, 1, 0.32, 1);
}

.loop-state span.morph-out,
.loop-saw span.morph-out {
  opacity: 0;
  transform: translateY(-8px);
  filter: blur(2px);
}

.loop-state span.morph-in,
.loop-saw span.morph-in {
  opacity: 0;
  transform: translateY(8px);
  filter: blur(2px);
  transition: none;
}

.loop-btn {
  transition: transform 160ms ease-out;
}

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

@media (prefers-color-scheme: dark) {
  .pill-white,
  .demo-menu,
  .demo-toast-item,
  .morph-button {
    background: var(--gray-300);
    box-shadow: inset 0 0 0 1px hsla(0, 0%, 100%, 0.07);
  }

  .pill-dark {
    background: var(--gray-1200);
    color: var(--gray-100);
  }

  .pill-dark:hover {
    background: rgba(238, 238, 236, 0.9);
  }

  .demo-menu div:hover {
    background: var(--gray-400);
  }
}

@media (prefers-reduced-motion: reduce) {
  .demo-menu,
  .demo-toast-item,
  .morph-button,
  .morph-button span,
  .pill-dark.eased {
    transition: none;
  }

  .scalein-box {
    transition: opacity 120ms ease;
  }

  .scalein-box.scalein-exit {
    transition: opacity 120ms ease;
    transform: none;
  }

  .scalein-btn {
    transition: none;
  }

  .scalein-btn span,
  .scalein-btn span.morph-out,
  .scalein-btn span.morph-in {
    transform: none;
    filter: none;
    transition: opacity 100ms ease;
  }

  .loop-rule {
    transition: none;
  }

  .loop-state span,
  .loop-saw span,
  .loop-state span.morph-out,
  .loop-saw span.morph-out,
  .loop-state span.morph-in,
  .loop-saw span.morph-in {
    transform: none;
    filter: none;
    transition: opacity 100ms ease;
  }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  .newsletter button span,
  .newsletter button span.morph-out,
  .newsletter button span.morph-in {
    transform: none;
    filter: none;
    transition: opacity 100ms ease;
  }

  .newsletter button:active {
    transform: none;
  }
}