/* Oxidized theme. Dark only. Contrast against --bg: --fg 15:1, --muted 9:1, --accent 6.6:1. */
:root {
  color-scheme: dark;
  --bg: #171311;
  --bg-raised: #1f1916;
  --fg: #f3ece6;
  --muted: #c9bdb4;
  --faint: #a99c92;
  --accent: #f07a3a;
  --accent-hover: #ff9a5c;
  --border: #3a2e28;
  --badge-bg: #4a1d1d;
  --badge-fg: #fecaca;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "DejaVu Sans Mono", monospace;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--accent-hover);
}

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

img {
  max-width: 100%;
}

.wrap {
  max-width: 70rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.skip {
  position: absolute;
  left: -100vw;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 1;
  padding: 0.5rem 1rem;
  background: var(--bg);
}

/* Header */

header.site .row {
  padding-block: 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--fg);
  text-decoration: none;
}

.wordmark {
  font-family: var(--mono);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

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

header.site nav {
  display: flex;
  gap: 1.5rem;
  font-weight: 600;
}

header.site nav a {
  color: var(--muted);
  text-decoration: none;
}

header.site nav a[aria-current="page"] {
  color: var(--fg);
  border-bottom: 2px solid var(--accent);
}

/* Home banner: the skyline sits at the bottom of the grid cell and the text overlays its sky. */

.hero {
  display: grid;
  background: var(--bg-raised);
}

.hero > * {
  grid-area: 1 / 1;
}

/* The height follows the artwork's 1280:380 ratio between 24rem and the 100rem max width, so the
   whole scene shows on desktops and phones crop to the bridge end. */
.skyline {
  align-self: end;
  justify-self: center;
  display: block;
  width: 100%;
  max-width: 100rem;
  height: clamp(24rem, 29.7vw, 29.7rem);
  object-fit: cover;
  object-position: 75% bottom;
}

/* Past the max width, fade the sides into the banner background. */
@media (min-width: 100rem) {
  .skyline {
    mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent);
  }
}

.hero-text {
  /* Positioned so it paints above the skyline, which the mask turns into a stacking context. */
  position: relative;
  width: 100%;
  padding-top: 3rem;
  padding-bottom: 9rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.lede {
  max-width: 30rem;
  margin: 1rem 0 1.5rem;
  color: #d8ccc3;
  font-size: 1.15rem;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.75rem;
  padding: 0 1.25rem;
  border: 2px solid var(--accent);
  border-radius: 0.4rem;
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
  text-decoration: none;
}

.button:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: var(--bg);
}

.button.secondary {
  background: transparent;
  color: var(--fg);
}

.button.secondary:hover {
  color: var(--accent-hover);
}

/* Sections */

.wrap > section {
  margin-block: 3rem;
}

.label {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: baseline;
  justify-content: space-between;
}

.section-head .label {
  margin: 0;
}

.empty {
  color: var(--muted);
}

/* Next event */

.featured {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  padding-block: 2rem;
  border-top: 2px solid var(--accent);
  border-bottom: 1px solid var(--border);
}

.date-block {
  display: flex;
  flex-direction: column;
  width: 7.5rem;
  line-height: 1;
}

.date-block .dow,
.date-block .month {
  color: var(--muted);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.date-block .day {
  margin: 0.4rem 0;
  font-size: 4.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.featured-body {
  display: flex;
  flex: 1 1 26rem;
  flex-direction: column;
  gap: 0.6rem;
  min-width: 0;
}

.featured-body h3 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  line-height: 1.15;
}

.featured-body h3 a {
  color: var(--fg);
  text-decoration: none;
}

.featured-body h3 a:hover {
  text-decoration: underline;
}

.featured-body p,
.summary p {
  margin: 0;
}

.speakers {
  font-size: 1.15rem;
}

.summary {
  max-width: 40rem;
  color: #d8ccc3;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-weight: 700;
}

.also {
  margin: 1rem 0 0;
  color: var(--muted);
}

.kind {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  margin: 0;
  color: var(--muted);
  font-weight: 600;
}

.badge {
  padding: 0 0.6rem;
  border-radius: 0.25rem;
  background: var(--badge-bg);
  color: var(--badge-fg);
}

.meta {
  color: var(--muted);
}

/* Event rows: recent talks and the past events page */

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

.rows li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--border);
}

.rows time {
  flex: 0 0 7rem;
  color: var(--faint);
}

.rows .title {
  flex: 1 1 22rem;
  min-width: 0;
}

.rows .title a {
  color: var(--fg);
  font-weight: 600;
}

.rows .who {
  color: var(--muted);
}

/* Inner pages */

.page {
  padding-block: 2.5rem 3rem;
}

.page h1 {
  margin: 0.25rem 0 0.5rem;
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.event h2 {
  margin: 2rem 0 0.5rem;
  font-size: 1.25rem;
}

.plain {
  padding-left: 1.25rem;
}

.body {
  max-width: 42rem;
}

.body pre {
  overflow-x: auto;
  padding: 0.75rem;
  border: 1px solid var(--border);
  background: var(--bg-raised);
}

.body code {
  font-family: var(--mono);
}

.body table {
  border-collapse: collapse;
}

.body th,
.body td {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border);
}

/* Footer */

footer.site {
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

footer.site .row {
  padding-block: 1.75rem;
}

.elsewhere {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  /* Lines the first icon up with the page edge. The links keep their padding as touch area. */
  margin-left: -0.75rem;
}

.elsewhere a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0 0.75rem;
  color: var(--fg);
  text-decoration: none;
}

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

.legal {
  max-width: 30rem;
  margin: 0;
  color: var(--faint);
  font-size: 0.875rem;
}

.legal a {
  color: var(--muted);
}