/* AI News Radar: one stylesheet. The palette borrows from navigation charts: a daytime chart
   (cool paper, navy ink, chart magenta) and a night display for dark mode. */

:root {
  color-scheme: light dark;
  --paper: #f2f5f5;
  --ink: #0f2330;
  --muted: #4a5d69;
  --rule: #c9d5da;
  --water: #dde8ec; /* radar face, hover tint */
  --water-line: #9fb6c1; /* rings and spokes (decorative) */
  --accent: #a0156b; /* chart magenta: links, focus, the sweep */
  --sweep: #a0156b99;
  --fresh: #0b7358;
  --warn: #9c4400;
  --warn-tint: #f8ebdf;

  /* Company colours. They fill badges behind white text (each is at least 5.9:1, WCAG AA) and
     colour the radar and the filter dots, so the three warm ones differ in hue and chroma
     (red, muted clay, ochre). A new source needs only its own rule below, e.g.
     .badge--mistral { --source: #xxxxxx; } with white text at 4.5:1 or more; without one it
     falls back to --badge-default. */
  --badge-anthropic: #8d4f3a;
  --badge-openai: #0e6b56;
  --badge-deepseek: #3b4fd1;
  --badge-google: #b3261e;
  --badge-aws: #8a5a00;
  --badge-huggingface: #6f3aa8;
  --badge-default: #57606a;

  --serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --target: 2.75rem; /* 44px touch targets */
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0c1a23;
    --ink: #dce6eb;
    --muted: #93a8b4;
    --rule: #22394a;
    --water: #122836;
    --water-line: #34586b;
    --accent: #f28ac6;
    --sweep: #f28ac680;
    --fresh: #5ad1a8;
    --warn: #f2b06b;
    --warn-tint: #2a2018;
  }
}

.badge--anthropic { --source: var(--badge-anthropic); }
.badge--openai { --source: var(--badge-openai); }
.badge--deepseek { --source: var(--badge-deepseek); }
.badge--google { --source: var(--badge-google); }
.badge--aws { --source: var(--badge-aws); }
.badge--huggingface { --source: var(--badge-huggingface); }

/* Base */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 3.5rem; /* focused entries never hide under a sticky day heading */
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1rem/1.5 var(--sans);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

/* Layout: one column on phones; from 64rem a sticky "console" beside the stream of news. */

.layout {
  width: min(100% - 2rem, 46rem);
  margin-inline: auto;
}

/* Console: masthead, radar, freshness and filters */

.console {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "mast scope"
    "signal signal"
    "legend legend";
  column-gap: 1rem;
  align-items: center;
  padding-block: 1.5rem 0.5rem;
}

.console > .masthead { grid-area: mast; }
.console > .scope { grid-area: scope; }
.console > .signal { grid-area: signal; }
.console > .legend { grid-area: legend; }

.wordmark {
  margin: 0;
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.015em;
}

.tagline {
  margin: 0.625rem 0 0;
  max-width: 30ch;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.45;
  text-wrap: balance;
}

.signal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0 1rem;
  margin-top: 1rem;
}

.freshness {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.freshness::before {
  content: "";
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--water-line);
}

.freshness[data-state="fresh"]::before {
  background: var(--fresh);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--fresh) 25%, transparent);
}

.freshness[data-state="stale"],
.freshness[data-state="down"] {
  color: var(--warn);
  font-weight: 600;
}

.freshness[data-state="stale"]::before,
.freshness[data-state="down"]::before {
  background: var(--warn);
}

.feeds {
  display: flex;
  gap: 1rem;
  margin: 0;
  font-size: 0.875rem;
}

.feeds a {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
}

/* Filters. On phones a wrap of chips; in the desktop console a legend with each source's
   newest-post age. The coloured dot matches the badge and the radar. */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin: 0.25rem 0 0;
  padding: 0;
  list-style: none;
}

.filter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: var(--target);
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.9375rem;
  line-height: 1.2;
  text-align: start;
  cursor: pointer;
}

.filter:hover {
  border-color: var(--water-line);
  background: var(--water);
}

.filter[aria-pressed="true"] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}

.filter-dot {
  flex: none;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--source, var(--badge-default));
}

.filter-dot--all {
  background: transparent;
  box-shadow: inset 0 0 0 2px currentColor;
}

.filter[aria-pressed="true"] .filter-dot:not(.filter-dot--all) {
  box-shadow: 0 0 0 2px var(--paper);
}

.filter-age {
  display: none;
  margin-left: auto;
  padding-left: 0.75rem;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 400;
  white-space: nowrap;
}

.filter-age--down {
  color: var(--warn);
  font-weight: 600;
}

.filter[aria-pressed="true"] .filter-age {
  color: var(--paper);
}

/* Radar */

.scope {
  margin: 0;
}

.scope-face {
  position: relative;
  width: 6.75rem;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 50%;
  background: var(--water);
}

.scope-plot {
  display: block;
  width: 100%;
  height: 100%;
}

.scope-ring,
.scope-spoke {
  fill: none;
  stroke: var(--water-line);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.scope-spoke {
  stroke-dasharray: 2 3;
}

.scope-ring--edge {
  stroke-width: 1.5;
}

.scope-centre {
  fill: var(--ink);
}

.scope-rim {
  fill: none;
  stroke: var(--source, var(--badge-default));
  stroke-width: 4;
  stroke-linecap: round;
}

.blip {
  fill: var(--source, var(--badge-default));
  stroke: var(--water);
  stroke-width: 0.9;
}

@media (prefers-color-scheme: dark) {
  /* Lift the company colours so the dots read on the night-blue background. */
  .blip {
    fill: color-mix(in oklab, var(--source, var(--badge-default)) 68%, #ffffff);
  }

  .scope-rim {
    stroke: color-mix(in oklab, var(--source, var(--badge-default)) 68%, #ffffff);
  }

  .filter-dot:not(.filter-dot--all) {
    background: color-mix(in oklab, var(--source, var(--badge-default)) 68%, #ffffff);
  }
}

.scope-rim.is-dimmed,
.blip.is-dimmed {
  opacity: 0.15;
}

.scope-sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0turn, transparent 0turn 0.8turn, var(--sweep) 1turn);
  opacity: 0;
  pointer-events: none;
}

.scope[data-state="down"] .scope-face {
  opacity: 0.55;
}

.scope-caption {
  display: none;
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.4;
}

/* News stream: one section per day, one entry per post */

.stream {
  min-width: 0;
  padding-bottom: 2.5rem;
}

.timeline {
  margin-top: 0.5rem;
}

.timeline:focus {
  outline: none;
}

.day-heading {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0;
  padding: 1rem 0 0.5rem;
  background: var(--paper);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.3;
}

.day-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.entries {
  margin: 0;
  padding: 0;
  list-style: none;
}

.entry-body {
  position: relative;
  display: grid;
  gap: 0.375rem;
  padding-block: 0.875rem;
}

.entry-source {
  margin: 0;
  line-height: 1;
}

.badge {
  display: inline-block;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  background: var(--source, var(--badge-default));
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.entry-title {
  max-width: 36em;
  margin: 0;
  font-family: var(--serif);
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.3;
  text-wrap: pretty;
}

.entry-title a {
  color: var(--ink);
  text-decoration: none;
}

.entry-title a:visited {
  color: var(--muted);
}

/* The whole entry is the link's hit area. It reaches a little into the side gutters and stays
   clear of the sticky day heading above, so the focus ring is never hidden. */
.entry-title a::after {
  content: "";
  position: absolute;
  inset: 0.25rem -0.625rem;
  border-radius: 0.625rem;
}

.entry-body:hover .entry-title a {
  text-decoration-line: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.18em;
}

.entry-title a:focus-visible {
  outline: none;
}

.entry-title a:focus-visible::after {
  outline: 3px solid var(--accent);
  outline-offset: 0;
}

.entry-desc {
  max-width: 65ch;
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

/* Loading, empty and error states */

.placeholder {
  margin: 1.5rem 0;
  color: var(--muted);
}

.notice {
  margin: 1rem 0 0.5rem;
  padding: 0.875rem 1rem;
  border: 1px solid color-mix(in srgb, var(--warn) 35%, transparent);
  border-radius: 0.75rem;
  background: var(--warn-tint);
  font-size: 0.9375rem;
}

.notice[hidden] {
  display: none;
}

.notice-title {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0;
  font-weight: 600;
}

.notice-title::before {
  content: "";
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--warn);
  transform: translateY(-0.05em);
}

.notice-list {
  margin: 0.375rem 0 0;
  padding: 0 0 0 1rem;
  list-style: none;
}

.notice-note {
  margin: 0.375rem 0 0 1rem;
  color: var(--muted);
}

.notice-action {
  min-height: var(--target);
  margin: 0.75rem 0 0 1rem;
  padding: 0.5rem 1.125rem;
  border: 0;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

/* Footer */

.site-footer {
  padding-block: 1.5rem 3rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.875rem;
}

.site-footer p {
  max-width: 60ch;
  margin: 0.5rem 0;
}

.shortcuts {
  margin-bottom: 1rem;
}

.shortcuts[hidden] {
  display: none;
}

.shortcuts-label {
  color: var(--ink);
  font-weight: 600;
}

.shortcut-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.shortcut-list a {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
}

/* Error page */

.lost {
  display: grid;
  width: min(100% - 2rem, 46rem);
  margin-inline: auto;
  justify-items: start;
  gap: 1.25rem;
  padding-block: 3rem 4rem;
}

.lost .scope-face {
  width: 9rem;
}

.lost-brand {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  font-weight: 700;
  text-decoration: none;
}

.lost-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 1.4rem + 3vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.015em;
}

.lost p {
  max-width: 34ch;
  margin: 0;
  color: var(--muted);
  font-size: 1.125rem;
}

.lost .lost-action {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
  text-decoration: none;
}

/* Wider screens */

@media (min-width: 40rem) {
  .console {
    padding-top: 2.5rem;
  }

  .wordmark {
    font-size: 2.5rem;
  }

  .scope-face {
    width: 8.5rem;
  }

  .entry-body {
    grid-template-columns: 6.75rem minmax(0, 1fr);
    column-gap: 1.25rem;
    padding-block: 1rem;
  }

  .entry-source {
    grid-row: 1 / span 2;
    padding-top: 0.3rem;
  }

  .entry-title,
  .entry-desc {
    grid-column: 2;
  }

  .entry-title {
    font-size: 1.3125rem;
  }

  .entry-desc {
    font-size: 1rem;
  }
}

@media (min-width: 64rem) {
  .layout {
    display: grid;
    grid-template-columns: 17rem minmax(0, 46rem);
    column-gap: clamp(3rem, 6vw, 6rem);
    justify-content: center;
    align-items: start;
    width: min(100% - 4rem, 75rem);
  }

  .console {
    grid-row: 1 / span 2;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 1.25rem;
    padding-block: 2.5rem 2rem;
  }

  .wordmark {
    font-size: 2.75rem;
    line-height: 0.95;
  }

  .tagline {
    margin-top: 0.75rem;
  }

  .scope-face {
    width: 12.5rem;
  }

  .scope-caption {
    display: block;
    max-width: 17rem;
  }

  .signal {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 0;
  }

  .filters {
    flex-direction: column;
    gap: 0.125rem;
    margin: 0;
  }

  .filter {
    width: 100%;
    border-color: transparent;
    border-radius: 0.625rem;
    padding-inline: 0.75rem;
  }

  .filter-age {
    display: block;
  }

  .stream {
    grid-column: 2;
    padding-top: 1.75rem;
  }

  .site-footer {
    grid-column: 2;
  }
}

/* Keep the console in view only when all of it fits on screen. */
@media (min-width: 64rem) and (min-height: 58rem) {
  .console {
    position: sticky;
    top: 0;
  }
}

/* Motion: one sweep of the radar when the data arrives, revealing the posts as it passes. */

@media (prefers-reduced-motion: no-preference) {
  .scope[data-state="ready"] .scope-sweep {
    animation: sweep 1.8s linear both;
  }

  .scope[data-state="ready"] .blip {
    transform-box: fill-box;
    transform-origin: center;
    animation: blip-in 0.45s ease-out backwards;
  }

  .scope[data-state="ready"] .blip.is-dimmed {
    animation-name: blip-in-dimmed;
  }

  /* The sweep crosses each 30-degree slice 0.15 s after the previous one. */
  .scope .blip[data-bucket="0"] { animation-delay: 0.075s; }
  .scope .blip[data-bucket="1"] { animation-delay: 0.225s; }
  .scope .blip[data-bucket="2"] { animation-delay: 0.375s; }
  .scope .blip[data-bucket="3"] { animation-delay: 0.525s; }
  .scope .blip[data-bucket="4"] { animation-delay: 0.675s; }
  .scope .blip[data-bucket="5"] { animation-delay: 0.825s; }
  .scope .blip[data-bucket="6"] { animation-delay: 0.975s; }
  .scope .blip[data-bucket="7"] { animation-delay: 1.125s; }
  .scope .blip[data-bucket="8"] { animation-delay: 1.275s; }
  .scope .blip[data-bucket="9"] { animation-delay: 1.425s; }
  .scope .blip[data-bucket="10"] { animation-delay: 1.575s; }
  .scope .blip[data-bucket="11"] { animation-delay: 1.725s; }

  .blip,
  .scope-rim {
    transition: opacity 0.2s ease-out;
  }
}

@keyframes sweep {
  0% { transform: rotate(0turn); opacity: 1; }
  80% { opacity: 1; }
  100% { transform: rotate(1turn); opacity: 0; }
}

@keyframes blip-in {
  0% { opacity: 0; transform: scale(2.4); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes blip-in-dimmed {
  0% { opacity: 0; transform: scale(2.4); }
  100% { opacity: 0.15; transform: scale(1); }
}

@media print {
  .skip-link,
  .scope,
  .signal,
  .legend,
  .site-footer {
    display: none;
  }

  .day-heading {
    position: static;
  }
}