:root {
  --canvas: #dfe7e9;
  --surface: #f8faf9;
  --paper: #fff;
  --ink: #1e3238;
  --secondary: #506970;
  --accent: #255f6e;
  --accent-hover: #194d59;
  --border: #c1cfd2;
  --control-border: #748b91;
  --error: #8a3034;
  color: var(--ink);
  background: var(--canvas);
  color-scheme: light;
  font-family: Inter, "Noto Sans JP", ui-sans-serif, system-ui, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--canvas);
}

body {
  min-height: 100vh;
  margin: 0;
}

button,
input {
  font: inherit;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

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

.app {
  width: min(46rem, calc(100% - 2rem));
  min-height: calc(100vh - 2rem);
  margin: 1rem auto;
  overflow: clip;
  border: 1px solid var(--border);
  border-radius: 1.15rem;
  background: var(--surface);
  box-shadow: 0 1.2rem 3rem rgb(30 50 56 / 10%);
}

.app-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 1.4rem 0;
  border-bottom: 1px solid var(--border);
}

.brand {
  margin: 0 0 0.85rem;
  color: var(--secondary);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.2em;
  line-height: 1;
}

.tabs {
  display: flex;
  gap: 1.1rem;
}

.tabs a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.85rem 0.2rem 0.75rem;
  border-radius: 0;
  color: var(--secondary);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.tabs a[aria-current="page"] {
  border-bottom: 2px solid var(--accent);
  color: var(--accent);
  font-weight: 750;
}

.reader {
  padding: 2rem 1.4rem 3rem;
}

.reader > h1 {
  max-width: 22ch;
  margin: 0;
  font-size: clamp(1.45rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.25;
}

.intro {
  margin: 0.45rem 0 1.5rem;
  color: var(--secondary);
  line-height: 1.7;
}

.intent-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.85rem;
  align-items: end;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: color-mix(in srgb, var(--canvas) 45%, var(--surface));
}

.field {
  display: grid;
  gap: 0.4rem;
  min-width: 0;
  color: var(--secondary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.field input {
  width: 100%;
  min-width: 0;
  min-height: 2.75rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--control-border);
  border-radius: 0.55rem;
  background: var(--paper);
  color: var(--ink);
}

.field input::placeholder {
  color: var(--secondary);
  opacity: 1;
  font-weight: 400;
  letter-spacing: 0;
}

.field input[aria-invalid="true"] {
  border-color: var(--error);
}

.field-error {
  color: var(--error);
  font-size: 0.76rem;
  font-weight: 650;
  letter-spacing: 0;
}

.intent-form button,
.state button {
  min-height: 2.75rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 0.55rem;
  background: var(--accent);
  color: var(--paper);
  cursor: pointer;
  font-weight: 750;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.segmented legend {
  width: 100%;
  margin-bottom: 0.4rem;
  color: var(--secondary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.segmented label {
  position: relative;
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--control-border);
  border-radius: 0.55rem;
  background: var(--surface);
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 650;
}

.segmented input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.segmented label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--paper);
}

.segmented label:has(input:focus-visible) {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.check {
  display: flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  font-size: 0.84rem;
  font-weight: 650;
}

.check input {
  width: 1.1rem;
  height: 1.1rem;
  margin: 0;
  accent-color: var(--accent);
}

.intent-form:has(.segmented) {
  grid-template-columns: minmax(0, 1fr) auto auto;
}

.intent-form:has(.segmented) .field {
  grid-column: 1 / -1;
}

.focal-post {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.4rem;
}

.focal-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.feed {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.4rem;
}

.post {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--paper);
}

.current-post {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 25%, transparent);
}

.post-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 0.65rem;
  align-items: center;
}

.post-header > div {
  min-width: 0;
  overflow-wrap: anywhere;
}

.avatar {
  border-radius: 50%;
}

.handle,
.post-header time {
  display: block;
  color: var(--secondary);
  font-size: 0.76rem;
  font-variant-numeric: tabular-nums;
}

.post-header time {
  text-align: right;
}

.post-text {
  margin: 0.9rem 0;
  overflow-wrap: anywhere;
  line-height: 1.75;
  white-space: pre-wrap;
}

.post a {
  color: var(--accent);
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.4rem;
  margin-top: 0.8rem;
  overflow: hidden;
  border-radius: 0.75rem;
  background: color-mix(in srgb, var(--canvas) 45%, var(--surface));
}

.media-grid > :only-child {
  grid-column: 1 / -1;
}

.media {
  display: block;
  width: 100%;
  max-height: 32rem;
  background: color-mix(in srgb, var(--canvas) 45%, var(--surface));
}

img.media {
  height: auto;
  object-fit: cover;
}

.media-grid > img:only-child {
  object-fit: contain;
}

video.media {
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.article-card,
.quote {
  margin-top: 0.8rem;
  padding: 0.85rem;
  overflow-wrap: anywhere;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface);
}

.article-card p {
  margin-bottom: 0;
  color: var(--secondary);
  line-height: 1.6;
}

.post-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-top: 1rem;
  color: var(--secondary);
  font-size: 0.74rem;
}

.post-footer a {
  display: inline-flex;
  min-height: 1.5rem;
  align-items: center;
  font-weight: 650;
}

.counts {
  font-variant-numeric: tabular-nums;
}

.state {
  margin: 1.4rem 0 0;
  padding: 1rem;
  color: var(--secondary);
  text-align: center;
}

.state p {
  margin-top: 0;
}

[role="alert"].state {
  color: var(--error);
}

.loading-rail {
  position: relative;
  padding: 0.8rem;
  color: var(--secondary);
  font-size: 0.78rem;
  text-align: center;
}

.loading-rail::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--accent) 45%,
    transparent 100%
  );
  content: "";
  animation: rail 1.1s ease-in-out infinite;
}

@keyframes rail {
  0%,
  100% {
    opacity: 0.25;
    transform: scaleX(0.35);
  }

  50% {
    opacity: 1;
    transform: scaleX(1);
  }
}

@media (hover: hover) and (pointer: fine) {
  a:hover {
    color: var(--accent-hover);
  }

  .intent-form button:hover,
  .state button:hover {
    border-color: var(--accent-hover);
    background: var(--accent-hover);
  }

  .segmented label:hover {
    border-color: var(--accent);
  }

  .segmented label:has(input:checked):hover {
    border-color: var(--accent-hover);
    background: var(--accent-hover);
  }
}

@media (max-width: 42rem) {
  .app {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .app-header,
  .reader {
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .tabs {
    gap: 0.7rem;
  }

  .intent-form,
  .intent-form:has(.segmented) {
    grid-template-columns: 1fr;
  }

  .intent-form button {
    width: 100%;
  }

  .post-header {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .post-header time {
    grid-column: 2;
    text-align: left;
  }

  .media-grid {
    grid-template-columns: 1fr;
  }

  .post-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}

.quote .post-header time {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .loading-rail::after {
    animation: none;
  }
}