:root {
  color-scheme: light dark;
  --log-bg: #fff;
  --log-ink: #21201c;
  --log-muted: #63635e;
  --log-faint: #898982;
  --log-line: #e7e7e5;
  --log-surface: #fff;
  --log-wash: #f5f5f2;
  --log-filter-hover: #fafafa;
  --log-filter-selected: color-mix(in srgb, var(--log-blue) 8%, var(--log-surface));
  /* Apple HIG increased-contrast light colors keep small primitive labels legible. */
  --log-blue: #1e6ef4;
  --log-green: #008932;
  --log-red: #e9152d;
  --log-teal: #008198;
  --log-gray: #6c6c70;
  --log-brown: #956d51;
  --log-yellow: #a16a00;
  --log-accent: var(--log-green);
  --log-focus: var(--log-blue);
  --log-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --log-mono: ui-monospace, SFMono-Regular, Consolas, monospace;
  --log-size-intro: 2rem;
  --log-size-title: 1.375rem;
  --log-size-page-title: 1.875rem;
  --log-size-subheading: 1.125rem;
  --log-size-section: 0.875rem;
  --log-size-body: 0.9375rem;
  --log-size-reading: 1rem;
  --log-size-caption: 0.75rem;
  --log-size-button: 0.875rem;
  --log-weight-regular: 400;
  --log-weight-medium: 500;
  --log-weight-heading: 600;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 32px; }
body {
  margin: 0;
  background: var(--log-bg);
  color: var(--log-ink);
  font-family: var(--log-font);
  font-weight: var(--log-weight-regular);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--log-focus); outline-offset: 5px; border-radius: 2px; }
.log-page { max-width: 788px; margin: 0 auto; padding: 32px; }
.log-intro { width: 100%; min-height: calc(100vh - 64px); min-height: calc(100svh - 64px); min-height: calc(100dvh - 64px); margin: 0; padding-block: 48px; display: flex; align-items: center; justify-content: center; text-align: center; }
.log-intro h1 { margin: 0; font-size: var(--log-size-intro); font-weight: var(--log-weight-heading); line-height: 1.35; }
.intro-content { display: flex; flex-direction: column; align-items: center; gap: 1.5rem; max-width: 100%; font-size: var(--log-size-intro); }
.intro-paragraph { display: block; }
.intro-paragraph + .intro-paragraph { margin-top: 28px; }
.intro-product { display: inline-flex; flex-wrap: wrap; max-width: 100%; align-items: center; justify-content: center; column-gap: 0.22em; row-gap: 0; }
.intro-brand { display: inline-flex; flex-wrap: nowrap; align-items: center; gap: 0.22em; }
.intro-logo { display: block; flex-shrink: 0; width: 2em; height: auto; }
.preview-note { display: flex; align-items: baseline; gap: 9px; margin: 0 0 48px; color: var(--log-faint); font-size: var(--log-size-caption); line-height: 1.6; }
.preview-note p { margin: 0; }
.preview-marker { font-size: var(--log-size-section); }
.stream-header { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.5rem 1.25rem; padding-bottom: 20px; }
.log-stream [hidden] { display: none; }
.stream-header h2 { margin: 0; font-size: var(--log-size-section); font-weight: var(--log-weight-heading); }
.log-tools { display: flex; align-items: center; gap: 8px; margin-left: auto; }
.entry-page-tools { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
[hidden] { display: none !important; }
.stream-header > span { font-family: var(--log-mono); font-size: var(--log-size-caption); color: var(--log-faint); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.log-filter { position: relative; }
.filter-trigger { display: inline-flex; align-items: center; gap: 0.375rem; padding: 0.375rem 0.75rem; border: 1px solid var(--log-line); border-radius: 6px; background: var(--log-surface); color: var(--log-muted); font-family: var(--log-font); font-size: var(--log-size-section); font-weight: var(--log-weight-regular); line-height: 1.5; cursor: pointer; }
.filter-trigger svg { width: 1rem; height: 1rem; flex-shrink: 0; }
.theme-trigger { width: 2.1875rem; height: 2.1875rem; justify-content: center; padding: 0; }
.filter-trigger:hover { background: var(--log-filter-hover); color: var(--log-ink); }
.filter-trigger[aria-expanded="true"] { background: var(--log-filter-selected); border-color: var(--log-blue); color: var(--log-blue); }
.filter-trigger:focus-visible { outline: 2px solid var(--log-focus); outline-offset: 3px; }
.filter-panel { position: absolute; top: calc(100% + 8px); right: 0; z-index: 10; width: 14rem; max-width: calc(100vw - 48px); padding: 0.5rem; border: 1px solid var(--log-line); border-radius: 6px; background: var(--log-surface); box-shadow: 0 8px 24px rgb(0 0 0 / 8%); }
.filter-panel fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
.filter-panel legend { padding: 0.375rem 0.625rem 0.625rem; color: var(--log-muted); font-size: var(--log-size-caption); }
.filter-option { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.625rem; border-radius: 4px; color: var(--log-ink); font-size: var(--log-size-section); line-height: 1.5; cursor: pointer; }
.filter-option:hover:not(:has(input:checked)) { background: var(--log-filter-hover); }
.filter-option:has(input:checked) { background: var(--log-filter-selected); color: var(--log-blue); font-weight: var(--log-weight-medium); }
.filter-option:has(input:focus-visible) { outline: 2px solid var(--log-focus); outline-offset: -2px; }
.filter-option small { display: block; color: var(--log-muted); font-size: var(--log-size-caption); }
.filter-option svg { width: 1rem; height: 1rem; flex-shrink: 0; color: var(--log-blue); visibility: hidden; }
.filter-option:has(input:checked) svg { visibility: visible; }
.update-timeline { list-style: none; margin: 35px 0 0; padding: 0; }
.dated-log { margin-top: 35px; }
.month-group { display: grid; grid-template-columns: 8rem minmax(0, 1fr); column-gap: 2.0625rem; }
.month-group + .month-group { margin-top: 80px; }
.month-marker { min-width: 0; }
.month-group .update-timeline { margin-top: 0; }
.timeline-entry { position: relative; min-width: 0; }
.timeline-month-title { position: sticky; top: 2rem; width: fit-content; margin: 0; padding: 0.375rem 0; font-family: var(--log-mono); font-size: var(--log-size-caption); font-weight: var(--log-weight-medium); line-height: 1.5; color: var(--log-ink); }
.update-status { display: block; margin-top: 9px; color: var(--log-faint); font-family: var(--log-mono); font-size: var(--log-size-caption); line-height: 1.65; }
.date-uncertain { color: var(--log-faint); }
.update-package { min-width: 0; padding-bottom: 64px; }
.timeline-entry:last-child .update-package { padding-bottom: 0; }
.update-summary { margin: 0; color: var(--log-muted); font-size: var(--log-size-body); line-height: 1.8; }
.notes-preview { height: 5rem; margin-top: 24px; overflow: hidden; opacity: 0.85; pointer-events: none; user-select: none; -webkit-mask-image: linear-gradient(to bottom, #000 15%, transparent 100%); mask-image: linear-gradient(to bottom, #000 15%, transparent 100%); }
.update-cta { display: inline-flex; align-items: center; gap: 0.3125rem; margin-top: 8px; padding: 0.4375rem 0.875rem; border: 1px solid var(--log-blue); border-radius: 999px; background: transparent; color: var(--log-blue); font-size: var(--log-size-button); font-weight: var(--log-weight-regular); line-height: 1.5; text-decoration: none; }
.update-cta svg { width: 1em; height: 1em; flex-shrink: 0; }
.update-cta:hover { background: var(--log-blue); color: #fff; }
.update-cta:active { transform: translateY(1px); }
.update-blocks { margin-top: 23px; }
.update-block + .update-block { margin-top: 23px; }
.update-detail { display: grid; grid-template-columns: 5.9375rem minmax(0, 1fr); align-items: start; gap: 0.75rem; }
.update-detail p { margin: 0; color: var(--log-muted); font-size: var(--log-size-body); line-height: 1.8; }
.update-prose { min-width: 0; }
.update-prose p + p { margin-top: 10px; }
.update-prose code { padding: 1px 4px; border-radius: 3px; background: var(--log-wash); color: var(--log-ink); font-family: var(--log-mono); font-size: 0.9em; overflow-wrap: anywhere; }
.entry-type { display: inline-flex; align-items: center; gap: 0.5em; padding-top: 5px; color: var(--type-ink); font-family: var(--log-mono); font-size: var(--log-size-caption); line-height: 1.4; }
.entry-type svg { width: 1.1667em; height: 1.1667em; flex-shrink: 0; }
.entry-type--change { --type-ink: var(--log-blue); }
.entry-type--decision { --type-ink: var(--log-green); }
.entry-type--experiment { --type-ink: var(--log-red); }
.entry-type--observation { --type-ink: var(--log-teal); }
.entry-type--process { --type-ink: var(--log-gray); }
.entry-type--discussion { --type-ink: var(--log-brown); }
.entry-type--question { --type-ink: var(--log-yellow); }
.entry-title { margin: 0 0 9px; font-size: var(--log-size-title); font-weight: var(--log-weight-heading); line-height: 1.4; }
.log-artifact { margin: 20px 0 0; }
.update-block--visual .log-artifact { margin-top: 0; }
.log-artifact figcaption { margin: 11px 0 0; color: var(--log-faint); font-size: var(--log-size-caption); line-height: 1.65; }
.journal-image, .journal-video { display: block; max-width: 100%; width: 100%; height: auto; border: 1px solid var(--log-line); border-radius: 12px; }
.journal-document { display: inline-block; padding: 12px 16px; border: 1px solid var(--log-line); border-radius: 8px; font-size: var(--log-size-body); }
.artifact-context { margin: 0 0 14px; color: var(--log-muted); font-size: var(--log-size-body); line-height: 1.8; }
.update-relations { list-style: none; margin: 24px 0 0; padding: 0; font-size: var(--log-size-caption); line-height: 1.7; }
.update-relations li + li { margin-top: 7px; }
.update-relations span { color: var(--log-faint); margin-right: 5px; }
.update-relations a { color: var(--log-muted); text-underline-offset: 3px; text-decoration-color: var(--log-line); }
.update-relations a:hover { text-decoration-color: var(--log-muted); }
.undated-log { margin-top: 68px; }
.undated-log .update-timeline { margin-left: calc(8rem + 2.0625rem); }
.undated-log > h2 { margin: 0 0 10px; font-size: var(--log-size-section); font-weight: var(--log-weight-heading); }
.undated-log > p { margin: 0; color: var(--log-muted); font-size: var(--log-size-body); line-height: 1.8; }
.email-artifact, .flow-artifact { overflow: hidden; border: 1px solid var(--log-line); border-radius: 12px; background: var(--log-surface); }
.artifact-toolbar { display: flex; justify-content: space-between; gap: 12px; padding: 12px 19px; border-bottom: 1px solid var(--log-line); color: var(--log-faint); font-family: var(--log-mono); font-size: var(--log-size-caption); }
.email-content { padding: 25px 25px 30px; }
.email-sender { display: flex; align-items: center; gap: 8px; margin: 0 0 26px; font-size: var(--log-size-caption); font-weight: var(--log-weight-heading); }
.email-avatar { display: inline-grid; place-items: center; width: 1.9167em; height: 1.9167em; margin-right: 1px; background: var(--log-wash); border-radius: 6px; font-size: var(--log-size-caption); }
.email-recipient { color: var(--log-faint); font-size: var(--log-size-caption); font-weight: var(--log-weight-regular); }
.email-subject { margin: 0 0 13px; font-size: var(--log-size-subheading); font-weight: var(--log-weight-heading); line-height: 1.4; }
.email-attachment { display: inline-flex; align-items: center; gap: 7px; max-width: 100%; padding: 7px 9px; border: 1px solid var(--log-line); border-radius: 5px; font-size: var(--log-size-caption); color: var(--log-muted); }
.email-attachment svg { flex-shrink: 0; }
.email-instruction { margin: 24px 0 0; font-size: var(--log-size-body); line-height: 1.7; }
.email-signoff { margin: 25px 0 0; color: var(--log-faint); font-size: var(--log-size-caption); line-height: 1.6; }
.copy-comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 23px; }
.copy-comparison > div { border-left: 2px solid var(--log-line); padding-left: 14px; }
.comparison-label { color: var(--log-faint); font-family: var(--log-mono); font-size: var(--log-size-caption); }
.copy-comparison p { margin: 9px 0 0; color: var(--log-muted); font-size: var(--log-size-body); line-height: 1.75; }
.copy-comparison > div:last-child p { color: var(--log-ink); }
.flow-steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; padding: 25px 19px; margin: 0; gap: 14px; }
.flow-steps li { display: flex; flex-direction: column; gap: 12px; font-size: var(--log-size-caption); line-height: 1.6; }
.flow-number { display: grid; place-items: center; width: 2.1667em; height: 2.1667em; background: var(--log-wash); border: 1px solid var(--log-line); border-radius: 50%; color: var(--log-muted); font-family: var(--log-mono); font-size: var(--log-size-caption); }
.address-artifact { margin: 19px 0 0; padding: 18px 20px; border: 1px solid var(--log-line); border-radius: 8px; background: var(--log-wash); }
.address-artifact code { font-family: var(--log-mono); font-size: clamp(0.75rem, 3.4vw, 1rem); overflow-wrap: anywhere; }
.entry-footnote { margin: 19px 0 0; color: var(--log-faint); font-size: var(--log-size-caption); line-height: 1.6; }
.entry-footnote span { padding: 0 4px; }
.entry-page { max-width: 564px; margin: 90px auto 100px; }
.back-link { display: inline-flex; align-items: center; gap: 0.3125rem; font-size: var(--log-size-button); color: var(--log-muted); text-decoration: none; }
.back-link svg { width: 1em; height: 1em; flex-shrink: 0; }
.back-link:hover { color: var(--log-blue); }
.entry-page-date { margin: 38px 0 25px; font-family: var(--log-mono); color: var(--log-muted); font-size: var(--log-size-caption); line-height: 1.6; }
.entry-page-date span { color: var(--log-faint); }
.entry-page .entry-title { font-size: var(--log-size-page-title); line-height: 1.25; margin-bottom: 20px; }
.entry-page .update-summary { font-size: var(--log-size-reading); }
.entry-page .update-package { padding-bottom: 0; }
.entry-page .update-blocks { margin-top: 32px; }
.entry-page .update-block + .update-block { margin-top: 28px; }
.entry-page .update-detail p { font-size: var(--log-size-reading); }

@media (prefers-color-scheme: dark) {
  :root {
    --log-bg: #030303;
    --log-ink: #dedfe3;
    --log-muted: #9c9ca1;
    --log-faint: #85858b;
    --log-line: #242428;
    --log-surface: #0b0b0c;
    --log-wash: #111113;
    --log-filter-hover: #1c1c1e;
    --log-filter-selected: color-mix(in srgb, var(--log-blue) 16%, var(--log-surface));
    --log-blue: #0091ff;
    --log-green: #30d158;
    --log-red: #ff4245;
    --log-teal: #00d2e0;
    --log-gray: #8e8e93;
    --log-brown: #b78a66;
    --log-yellow: #ffd600;
  }
}

@media (prefers-contrast: more) {
  :root {
    --log-ink: #000;
    --log-muted: #3a3a3c;
    --log-faint: #48484a;
    --log-line: #8e8e93;
  }
}

@media (prefers-color-scheme: dark) and (prefers-contrast: more) {
  :root {
    --log-ink: #fff;
    --log-muted: #d1d1d6;
    --log-faint: #aeaeb2;
    --log-line: #636366;
    --log-blue: #5cb8ff;
    --log-green: #4ad968;
    --log-red: #ff6165;
    --log-teal: #3bddec;
    --log-gray: #aeaeb2;
    --log-brown: #dba679;
    --log-yellow: #fedf43;
  }
}

/* Explicit preferences take precedence over system media queries. */
:root[data-theme="light"] {
  color-scheme: light;
  --log-bg: #fff;
  --log-ink: #21201c;
  --log-muted: #63635e;
  --log-faint: #898982;
  --log-line: #e7e7e5;
  --log-surface: #fff;
  --log-wash: #f5f5f2;
  --log-filter-hover: #fafafa;
  --log-filter-selected: color-mix(in srgb, var(--log-blue) 8%, var(--log-surface));
  --log-blue: #1e6ef4;
  --log-green: #008932;
  --log-red: #e9152d;
  --log-teal: #008198;
  --log-gray: #6c6c70;
  --log-brown: #956d51;
  --log-yellow: #a16a00;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --log-bg: #030303;
  --log-ink: #dedfe3;
  --log-muted: #9c9ca1;
  --log-faint: #85858b;
  --log-line: #242428;
  --log-surface: #0b0b0c;
  --log-wash: #111113;
  --log-filter-hover: #1c1c1e;
  --log-filter-selected: color-mix(in srgb, var(--log-blue) 16%, var(--log-surface));
  --log-blue: #0091ff;
  --log-green: #30d158;
  --log-red: #ff4245;
  --log-teal: #00d2e0;
  --log-gray: #8e8e93;
  --log-brown: #b78a66;
  --log-yellow: #ffd600;
}
@media (prefers-contrast: more) {
  :root[data-theme="light"] {
    --log-ink: #000;
    --log-muted: #3a3a3c;
    --log-faint: #48484a;
    --log-line: #8e8e93;
  }
  :root[data-theme="dark"] {
    --log-ink: #fff;
    --log-muted: #d1d1d6;
    --log-faint: #aeaeb2;
    --log-line: #636366;
    --log-blue: #5cb8ff;
    --log-green: #4ad968;
    --log-red: #ff6165;
    --log-teal: #3bddec;
    --log-gray: #aeaeb2;
    --log-brown: #dba679;
    --log-yellow: #fedf43;
  }
}

@media (max-width: 600px) {
  .log-page { padding: 24px; }
  .log-intro { --log-size-intro: 1.75rem; min-height: calc(100vh - 48px); min-height: calc(100svh - 48px); min-height: calc(100dvh - 48px); padding-block: 32px; }
  .preview-note { margin-bottom: 44px; }
  .month-group { grid-template-columns: minmax(0, 1fr); row-gap: 24px; }
  .month-group + .month-group { margin-top: 56px; }
  .timeline-month-title { position: static; }
  .update-status { margin-top: 0; }
  .timeline-entry > .update-package { padding-bottom: 48px; }
  .timeline-entry:last-child > .update-package { padding-bottom: 0; }
  .log-page { --log-size-title: 1.3125rem; }
  .update-detail { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .entry-type { padding-top: 0; }
  .notes-preview { height: 6.5rem; }
  .entry-page { margin: 70px auto; }
}

@media (max-width: 360px) {
  .log-page { padding-right: 18px; padding-left: 18px; }
  .email-content { padding: 22px 18px; }
  .copy-comparison { grid-template-columns: 1fr; }
  .flow-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
}

@media (prefers-reduced-motion: no-preference) {
  .update-cta svg { transition: transform 160ms ease; }
  .update-cta:hover svg { transform: translateX(2px); }
  .log-stream { animation: log-arrive 550ms 80ms ease-out backwards; }
  @keyframes log-arrive {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
  }
}

/* Touch devices keep the logo static rather than continually transforming its image layer. */
@media (prefers-reduced-motion: no-preference) and (min-width: 601px) and (hover: hover) and (pointer: fine) {
  .log-intro { animation: log-arrive 450ms ease-out backwards; }
  .intro-logo { animation: logo-drift 6s ease-in-out infinite; transform-origin: center; }
  @keyframes logo-drift {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(5px, -5px) rotate(3deg); }
  }
}