/*
 * Koss Topology design layer.
 *
 * The palette and rhythm come from the site design draft: a light canvas, hairline
 * rules instead of shadows, monospace for anything that reports state, and a blue
 * signal colour reserved for live/active things.
 */

:root {
  --koss-ink: oklch(0.245 0.022 258);
  --koss-ink-soft: oklch(0.34 0.02 258);
  --koss-ink-mute: oklch(0.505 0.016 258);
  --koss-ink-quiet: oklch(0.66 0.014 258);
  --koss-canvas: oklch(0.966 0.004 258);
  --koss-surface: oklch(0.995 0.002 258);
  --koss-surface-hover: oklch(0.975 0.01 255);
  --koss-line: oklch(0.845 0.01 258);
  --koss-line-soft: oklch(0.885 0.008 258);
  --koss-signal: oklch(0.52 0.13 255);
  --koss-flag: oklch(0.56 0.13 45);
  --koss-deep: oklch(0.285 0.03 258);
  --koss-deep-line: oklch(0.4 0.03 258);
  --koss-on-deep: oklch(0.96 0.004 258);

  --koss-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --koss-display: 'Bricolage Grotesque', ui-sans-serif, system-ui, sans-serif;
  --koss-text: 'Source Serif 4', Georgia, 'Times New Roman', serif;

  --koss-gutter: clamp(1.25rem, 4vw, 3rem);
  --koss-max: 1280px;
}

body {
  background: var(--koss-canvas);
  color: var(--koss-ink);
  font-family: var(--koss-text);
  -webkit-font-smoothing: antialiased;
}

.koss-shell {
  max-width: var(--koss-max);
  margin-inline: auto;
  background: var(--koss-canvas);
  border-inline: 1px solid var(--koss-line);
  min-height: 100vh;
}

/* ── Skip link ─────────────────────────────────────────────── */

.koss-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--koss-ink);
  color: var(--koss-surface);
  font-family: var(--koss-mono);
  font-size: 0.8rem;
  padding: 0.75rem 1.25rem;
}

.koss-skip:focus {
  left: 0;
}

/* ── Header ────────────────────────────────────────────────── */

.koss-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.1rem var(--koss-gutter);
  border-bottom: 1px solid var(--koss-line);
  background: var(--koss-surface);
  position: sticky;
  top: 0;
  z-index: 30;
}

.koss-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--koss-ink);
  border-radius: 3px;
  font-family: var(--koss-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--koss-ink);
  text-decoration: none;
  transition: background-color 120ms ease, color 120ms ease;
}

.koss-logo:hover {
  background: var(--koss-ink);
  color: oklch(0.99 0.004 258);
}

.koss-nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  font-family: var(--koss-mono);
  font-size: 0.78rem;
}

.koss-nav a {
  color: var(--koss-ink-soft);
  text-decoration: none;
}

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

.koss-langswitch {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  color: var(--koss-ink-quiet);
}

.koss-langswitch [aria-current='true'] {
  color: var(--koss-ink);
  font-weight: 500;
}

.koss-langswitch a {
  color: var(--koss-ink-mute);
}

.koss-nav__cta {
  border: 1px solid var(--koss-ink);
  padding: 0.5rem 0.95rem;
  color: var(--koss-ink);
}

.koss-nav__cta:hover {
  background: var(--koss-ink);
  color: var(--koss-surface);
}

.koss-burger {
  display: none;
  background: none;
  border: 1px solid var(--koss-line);
  font-family: var(--koss-mono);
  font-size: 0.75rem;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  color: var(--koss-ink);
}

/* ── Hero ──────────────────────────────────────────────────── */

.koss-home > * + * {
  margin-top: 3.5rem;
}

.koss-hero {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 3rem;
  align-items: end;
  padding: 4.5rem var(--koss-gutter) 0;
}

.koss-hero__text {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.koss-kicker {
  font-family: var(--koss-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--koss-ink-mute);
  display: flex;
  gap: 0.65rem;
  align-items: center;
  margin: 0;
}

.koss-kicker--light {
  color: oklch(0.75 0.02 258);
}

.koss-node {
  width: 9px;
  height: 9px;
  background: var(--koss-signal);
  flex: none;
}

.koss-hero__title {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 5.2vw, 4.125rem);
  line-height: 0.99;
  letter-spacing: -0.034em;
  margin: 0;
  max-width: 19ch;
}

.koss-hero__lede {
  margin: 0;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  max-width: 54ch;
  color: var(--koss-ink-soft);
}

.koss-hero__photo img {
  width: 260px;
  height: 300px;
  object-fit: cover;
  object-position: 50% 22%;
  filter: saturate(0.9);
  display: block;
}

/* ── Topology nav ──────────────────────────────────────────── */

.koss-topology {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--koss-line);
  border-bottom: 1px solid var(--koss-line);
  margin-inline: var(--koss-gutter);
  position: relative;
}

.koss-topology::before,
.koss-topology::after {
  content: '';
  position: absolute;
  top: -1.75rem;
  width: 1px;
  height: 1.75rem;
  background: oklch(0.78 0.012 258);
}

.koss-topology::before { left: 16.6%; }
.koss-topology::after { left: 83.3%; }

.koss-topology__node {
  padding: 1.75rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  color: var(--koss-ink);
  text-decoration: none;
  background: var(--koss-surface);
  border-right: 1px solid var(--koss-line);
}

.koss-topology__node:last-child { border-right: 0; }
.koss-topology__node:hover { background: var(--koss-surface-hover); }

.koss-topology__label {
  font-family: var(--koss-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--koss-signal);
}

.koss-topology__title {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.koss-topology__meta {
  font-family: var(--koss-mono);
  font-size: 0.72rem;
  color: var(--koss-ink-mute);
}

/* ── Stats ─────────────────────────────────────────────────── */

.koss-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--koss-line);
  background: var(--koss-surface);
  margin-inline: var(--koss-gutter);
}

.koss-stat {
  padding: 1.75rem;
  border-right: 1px solid var(--koss-line-soft);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.koss-stat:last-child { border-right: 0; }

.koss-stat__value {
  font-family: var(--koss-mono);
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1;
}

.koss-stat__label {
  font-family: var(--koss-mono);
  font-size: 0.7rem;
  color: var(--koss-ink-mute);
}

/* ── Sections ──────────────────────────────────────────────── */

.koss-section {
  padding-inline: var(--koss-gutter);
}

.koss-split .koss-section { padding-inline: 0; }

.koss-section__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px solid var(--koss-line);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
}

.koss-section__head h2 {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: -0.022em;
  margin: 0;
}

.koss-more {
  font-family: var(--koss-mono);
  font-size: 0.75rem;
  color: var(--koss-ink);
  text-decoration: none;
  white-space: nowrap;
}

.koss-more:hover { color: var(--koss-signal); }

.koss-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  padding-inline: var(--koss-gutter);
}

/* ── Cards ─────────────────────────────────────────────────── */

.koss-cards {
  display: grid;
  gap: 1.25rem;
}

.koss-cards--repos { grid-template-columns: repeat(3, 1fr); }
.koss-cards--products { grid-template-columns: repeat(2, 1fr); }

.koss-card {
  border: 1px solid var(--koss-line);
  background: var(--koss-surface);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--koss-ink);
}

.koss-card--link:hover { border-color: var(--koss-signal); }

.koss-card--ghost {
  background: transparent;
  border-style: dashed;
}

.koss-card__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--koss-mono);
  font-size: 0.7rem;
  color: var(--koss-ink-mute);
}

.koss-card__repo {
  font-family: var(--koss-mono);
  font-size: 0.84rem;
  font-weight: 500;
}

.koss-card__title {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.15;
}

.koss-card__text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--koss-ink-soft);
}

.koss-card__meta {
  display: flex;
  gap: 0.85rem;
  font-family: var(--koss-mono);
  font-size: 0.7rem;
  color: var(--koss-ink-mute);
  margin: 0;
  margin-top: auto;
  padding-top: 0.4rem;
}

.is-quiet { color: var(--koss-ink-quiet); }

.koss-badge {
  font-family: var(--koss-mono);
  font-size: 0.65rem;
  border: 1px solid oklch(0.78 0.012 258);
  padding: 0.1rem 0.35rem;
  color: var(--koss-ink-mute);
}

.koss-badge--flag {
  border-color: var(--koss-flag);
  color: var(--koss-flag);
}

/* ── Post lists ────────────────────────────────────────────── */

.koss-postlist { display: flex; flex-direction: column; }

.koss-postlist__item {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--koss-line-soft);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  color: var(--koss-ink);
  text-decoration: none;
}

.koss-postlist__item:hover {
  background: oklch(0.985 0.006 255);
}

.koss-postlist__title {
  font-family: var(--koss-display);
  font-weight: 500;
  font-size: 1.24rem;
  line-height: 1.2;
  letter-spacing: -0.018em;
}

.koss-postlist__meta {
  font-family: var(--koss-mono);
  font-size: 0.7rem;
  color: var(--koss-ink-mute);
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

/* ── Blog filter ───────────────────────────────────────────── */

.koss-blog { padding: 2.5rem var(--koss-gutter) 0; }

.koss-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.koss-chip {
  font-family: var(--koss-mono);
  font-size: 0.72rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--koss-line);
  background: var(--koss-surface);
  color: var(--koss-ink-mute);
  cursor: pointer;
}

.koss-chip.is-on {
  background: var(--koss-ink);
  border-color: var(--koss-ink);
  color: var(--koss-surface);
}

.koss-blog__count {
  font-family: var(--koss-mono);
  font-size: 0.72rem;
  color: var(--koss-ink-mute);
  margin: 0 0 0.5rem;
}

/* ── Video facade ──────────────────────────────────────────── */

.koss-video__trigger {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  aspect-ratio: 16 / 9;
  width: 100%;
  border: 1px solid oklch(0.78 0.012 258);
  background: oklch(0.945 0.006 258);
  padding: 1.35rem;
  cursor: pointer;
  text-align: left;
  color: var(--koss-ink);
  overflow: hidden;
}

.koss-video__trigger:hover {
  border-color: var(--koss-signal);
}

.koss-video__thumb {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: saturate(0.7);
}

.koss-video__meta,
.koss-video__body {
  position: relative;
}

.koss-video__meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--koss-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--koss-ink-mute);
}

.koss-video__body {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: flex-start;
}

.koss-video__title {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  letter-spacing: -0.02em;
  line-height: 1.12;
}

.koss-video__event {
  font-family: var(--koss-mono);
  font-size: 0.7rem;
  color: var(--koss-ink-mute);
}

.koss-video__cta {
  font-family: var(--koss-mono);
  font-size: 0.78rem;
  background: var(--koss-ink);
  color: var(--koss-surface);
  padding: 0.6rem 1rem;
}

.koss-video iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 0;
  display: block;
}

.koss-note {
  font-family: var(--koss-mono);
  font-size: 0.68rem;
  color: var(--koss-ink-mute);
  margin: 0.6rem 0 0;
}

/* ── Talks page ────────────────────────────────────────────── */

.koss-talks {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  padding: 2.5rem var(--koss-gutter) 0;
}

.koss-talk {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 2.25rem;
  align-items: start;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--koss-line);
}

.koss-talk:last-child { border-bottom: 0; }

.koss-talk__body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.koss-talk__meta {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--koss-mono);
  font-size: 0.7rem;
  color: var(--koss-ink-mute);
  margin: 0;
}

.koss-talk__title {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  letter-spacing: -0.024em;
  line-height: 1.14;
  margin: 0;
}

.koss-talk__desc {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--koss-ink-soft);
}

/* ── CTA band ──────────────────────────────────────────────── */

.koss-cta {
  background: var(--koss-deep);
  color: var(--koss-on-deep);
  padding: 3.25rem var(--koss-gutter);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  margin-top: 3.5rem;
}

.koss-cta__block {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  align-items: flex-start;
}

.koss-cta__block--split {
  border-left: 1px solid var(--koss-deep-line);
  padding-left: 2.5rem;
}

.koss-cta h2 {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  line-height: 1.08;
  letter-spacing: -0.026em;
  margin: 0;
  max-width: 24ch;
  color: var(--koss-on-deep);
}

.koss-button {
  font-family: var(--koss-mono);
  font-size: 0.8rem;
  padding: 0.8rem 1.25rem;
  text-decoration: none;
  background: var(--koss-ink);
  color: var(--koss-surface);
}

.koss-button--light {
  background: var(--koss-on-deep);
  color: var(--koss-ink);
}

.koss-button--light:hover {
  background: var(--koss-signal);
  color: oklch(0.98 0.004 258);
}

/* ── Footer ────────────────────────────────────────────────── */

.koss-footer {
  background: var(--koss-ink);
  color: oklch(0.86 0.01 258);
  padding: 2.25rem var(--koss-gutter);
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
  gap: 2.5rem;
  flex-wrap: wrap;
  font-family: var(--koss-mono);
  font-size: 0.75rem;
}

.koss-footer a {
  color: oklch(0.86 0.01 258);
  text-decoration: none;
}

.koss-footer a:hover { color: oklch(0.99 0.004 258); }

/* The consent links carry Real Cookie Banner's own classes so its handler
   binds to them. Keep them looking like the other footer links rather than
   the buttons the plugin styles them as. */
.koss-footer .rcb-sc-link {
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  cursor: pointer;
}

.koss-footer__links {
  display: flex;
  gap: 1.1rem;
  flex-wrap: wrap;
}

/* ── Article ───────────────────────────────────────────────── */

.koss-article {
  padding: 3rem var(--koss-gutter) 0;
}

.koss-article__header {
  max-width: 46rem;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--koss-line);
}

.koss-article__title {
  font-family: var(--koss-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 4vw, 3rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: 0;
}

.koss-article__meta {
  display: flex;
  gap: 0.85rem;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--koss-mono);
  font-size: 0.72rem;
  color: var(--koss-ink-mute);
  margin: 0;
}

.koss-article__body {
  max-width: 46rem;
  margin-inline: auto;
  padding-block: 2rem 3rem;
  font-size: 1.09rem;
  line-height: 1.72;
}

.koss-article__body > * + * { margin-top: 1.35rem; }

.koss-article__body h2 {
  font-family: var(--koss-display);
  font-size: 1.65rem;
  letter-spacing: -0.024em;
  margin-top: 2.75rem;
  line-height: 1.16;
}

.koss-article__body h3 {
  font-family: var(--koss-display);
  font-size: 1.28rem;
  letter-spacing: -0.02em;
  margin-top: 2rem;
}

.koss-article__body a { color: var(--koss-signal); }

.koss-article__body img,
.koss-article__body figure { max-width: 100%; height: auto; }

.koss-article__body pre {
  background: oklch(0.945 0.006 258);
  border: 1px solid var(--koss-line);
  padding: 1.1rem;
  overflow-x: auto;
  font-family: var(--koss-mono);
  font-size: 0.84rem;
  line-height: 1.6;
}

.koss-article__body code {
  font-family: var(--koss-mono);
  font-size: 0.88em;
  background: oklch(0.93 0.006 258);
  padding: 0.1em 0.35em;
}

.koss-article__body pre code { background: none; padding: 0; }

.koss-article__body blockquote {
  border-left: 2px solid var(--koss-signal);
  padding-left: 1.15rem;
  color: var(--koss-ink-soft);
  font-style: italic;
}

.koss-article__body ul,
.koss-article__body ol { padding-left: 1.4rem; }
.koss-article__body li + li { margin-top: 0.4rem; }

.koss-article__body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.koss-article__body th,
.koss-article__body td {
  border: 1px solid var(--koss-line);
  padding: 0.6rem 0.75rem;
  text-align: left;
}

.koss-page {
  padding: 3rem var(--koss-gutter) 3rem;
}

.koss-page__inner {
  max-width: 46rem;
  margin-inline: auto;
}

.koss-page--wide .koss-page__inner { max-width: none; }

.koss-page__inner > * + * { margin-top: 1.3rem; }

.koss-page__inner h1 {
  font-family: var(--koss-display);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 1.5rem;
}

.koss-page__inner h2 {
  font-family: var(--koss-display);
  font-size: 1.55rem;
  letter-spacing: -0.024em;
  margin-top: 2.5rem;
}

.koss-page__inner h3 {
  font-family: var(--koss-display);
  font-size: 1.2rem;
  margin-top: 1.75rem;
}

.koss-page__inner a { color: var(--koss-signal); }

.koss-page__inner ul,
.koss-page__inner ol { padding-left: 1.4rem; }

/* ── Responsive ────────────────────────────────────────────── */

@media (max-width: 980px) {
  /* Five nav items plus the switcher and CTA need a tighter rhythm before the
     burger takes over at 760px. */
  .koss-nav { gap: 1rem; font-size: 0.74rem; }
}

@media (max-width: 900px) {
  .koss-hero { grid-template-columns: 1fr; gap: 2rem; padding-top: 3rem; }
  .koss-hero__photo img { width: 180px; height: 210px; }
  .koss-topology { grid-template-columns: 1fr; }
  .koss-topology::before, .koss-topology::after { display: none; }
  .koss-topology__node { border-right: 0; border-bottom: 1px solid var(--koss-line); }
  .koss-topology__node:last-child { border-bottom: 0; }
  .koss-stats { grid-template-columns: repeat(2, 1fr); }
  .koss-stat:nth-child(2) { border-right: 0; }
  .koss-stat:nth-child(-n+2) { border-bottom: 1px solid var(--koss-line-soft); }
  .koss-split { grid-template-columns: 1fr; gap: 2.5rem; }
  .koss-cards--repos, .koss-cards--products { grid-template-columns: 1fr; }
  .koss-talk { grid-template-columns: 1fr; gap: 1.25rem; }
  .koss-cta { grid-template-columns: 1fr; gap: 2.25rem; }
  .koss-cta__block--split { border-left: 0; padding-left: 0; border-top: 1px solid var(--koss-deep-line); padding-top: 2rem; }
  .koss-footer { flex-direction: column; gap: 1.25rem; }
}

@media (max-width: 760px) {
  .koss-burger { display: block; }
  .koss-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem var(--koss-gutter);
    background: var(--koss-surface);
    border-bottom: 1px solid var(--koss-line);
  }
  .koss-nav.is-open { display: flex; }
  .koss-header { position: relative; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}