/* Forming a Planet (2014 archive): a deep-space observatory readout. Everything is scoped to .arc-planet. */

html:has(.arc-planet) {
  scrollbar-gutter: auto;
}

html:has(.arc-planet),
body:has(.arc-planet) {
  margin: 0;
  padding: 0;
  background: #04070d;
  color: #c8d2df;
  color-scheme: dark;
}

.arc-planet {
  --arc-pl-bg: #04070d;
  --arc-pl-panel: #070c16;
  --arc-pl-line: rgba(140, 170, 210, 0.16);
  --arc-pl-line-strong: rgba(140, 170, 210, 0.32);
  --arc-pl-text: #c8d2df;
  --arc-pl-muted: #7d8ba0;
  --arc-pl-bright: #eef3f9;
  --arc-pl-accent: #ff9a52;
  --arc-pl-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
  --arc-pl-sans: ui-sans-serif, -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;

  min-height: 100svh;
  overflow-x: clip;
  background: var(--arc-pl-bg);
  color: var(--arc-pl-text);
  font-family: var(--arc-pl-sans);
  font-size: 16.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.arc-planet a {
  color: var(--arc-pl-bright);
  text-decoration-color: rgba(255, 154, 82, 0.55);
  text-underline-offset: 3px;
}

.arc-planet a:hover {
  color: var(--arc-pl-accent);
  text-decoration-color: currentColor;
}

.arc-planet :focus-visible {
  outline: 2px solid var(--arc-pl-accent);
  outline-offset: 3px;
}

/* ---------- Top bar (44px; the controller reserves 44px + 150px for chrome) ---------- */

.arc-planet__bar {
  height: 44px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--arc-pl-line);
  font-family: var(--arc-pl-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.arc-planet a.arc-planet__home {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  color: var(--arc-pl-bright);
  font-family: var(--arc-pl-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
}

.arc-planet a.arc-planet__home span {
  color: var(--arc-pl-accent);
}

.arc-planet a.arc-planet__home:hover {
  color: var(--arc-pl-accent);
}

.arc-planet__archive {
  margin: 0;
  color: var(--arc-pl-muted);
  white-space: nowrap;
}

.arc-planet__archive span:last-child {
  color: var(--arc-pl-accent);
}

/* ---------- Stage ---------- */

.arc-planet__stage {
  /* No padding or border: the controller sizes the canvas from this element's clientWidth. */
  position: relative;
  cursor: crosshair;
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 70% at 50% 50%, rgba(28, 46, 84, 0.55), transparent 75%),
    #050912;
  user-select: none;
  -webkit-user-select: none;
}

.arc-planet__canvas {
  display: block;
  width: 100%;
  background-image:
    linear-gradient(var(--arc-pl-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--arc-pl-line) 1px, transparent 1px),
    linear-gradient(rgba(140, 170, 210, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 170, 210, 0.05) 1px, transparent 1px);
  background-size: 160px 160px, 160px 160px, 32px 32px, 32px 32px;
  background-position: center center;
  /* The one bold move: particles glow like hot rock under a long exposure. */
  filter: drop-shadow(0 0 5px rgba(255, 110, 50, 0.75)) drop-shadow(0 0 16px rgba(255, 80, 30, 0.35));
}

.arc-planet__hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.arc-planet__corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 0 solid var(--arc-pl-line-strong);
}

.arc-planet__corner--tl { top: 14px; left: 14px; border-top-width: 1px; border-left-width: 1px; }
.arc-planet__corner--tr { top: 14px; right: 14px; border-top-width: 1px; border-right-width: 1px; }
.arc-planet__corner--bl { bottom: 14px; left: 14px; border-bottom-width: 1px; border-left-width: 1px; }
.arc-planet__corner--br { bottom: 14px; right: 14px; border-bottom-width: 1px; border-right-width: 1px; }

.arc-planet__reticle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(46vh, 60vw, 420px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border: 1px dashed rgba(140, 170, 210, 0.14);
  border-radius: 50%;
}

.arc-planet__reticle::before,
.arc-planet__reticle::after {
  content: "";
  position: absolute;
  background: rgba(140, 170, 210, 0.28);
}

.arc-planet__reticle::before {
  top: 50%;
  left: -14px;
  right: -14px;
  height: 1px;
  background: linear-gradient(90deg, rgba(140, 170, 210, 0.35) 0 14px, transparent 14px calc(100% - 14px), rgba(140, 170, 210, 0.35) calc(100% - 14px));
}

.arc-planet__reticle::after {
  left: 50%;
  top: -14px;
  bottom: -14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(140, 170, 210, 0.35) 0 14px, transparent 14px calc(100% - 14px), rgba(140, 170, 210, 0.35) calc(100% - 14px));
}

.arc-planet__readout {
  position: absolute;
  top: 26px;
  margin: 0;
  display: grid;
  gap: 3px;
  font-family: var(--arc-pl-mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.arc-planet__readout--left { left: 30px; }
.arc-planet__readout--right { right: 30px; text-align: right; }

.arc-planet__readout div {
  display: flex;
  gap: 12px;
}

.arc-planet__readout--right div {
  justify-content: flex-end;
}

.arc-planet__readout dt {
  min-width: 64px;
  color: var(--arc-pl-muted);
}

.arc-planet__readout--right dt {
  min-width: 0;
}

.arc-planet__readout dd {
  margin: 0;
  color: var(--arc-pl-bright);
  min-width: 40px;
}

.arc-planet__live {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin: 0 7px 1px 0;
  border-radius: 50%;
  background: var(--arc-pl-accent);
  box-shadow: 0 0 8px var(--arc-pl-accent);
  animation: arc-planet-blink 2.4s ease-in-out infinite;
}

@keyframes arc-planet-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

.arc-planet__notice {
  position: absolute;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100% - 48px);
  padding: 8px 14px;
  border: 1px solid var(--arc-pl-line-strong);
  background: rgba(4, 7, 13, 0.72);
  color: var(--arc-pl-text);
  font-family: var(--arc-pl-mono);
  font-size: 11px;
  line-height: 1.55;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
  text-wrap: balance;
  pointer-events: none;
  user-select: none;
}

/* ---------- Title band ---------- */

.arc-planet__title {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 18px 48px;
  align-items: end;
  padding: 26px 16px 30px;
  max-width: 1240px;
  margin: 0 auto;
}

.arc-planet__kicker {
  margin: 0 0 6px;
  font-family: var(--arc-pl-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--arc-pl-accent);
}

.arc-planet__title h1 {
  margin: 0;
  font-family: var(--arc-pl-sans);
  font-weight: 200;
  font-size: clamp(38px, 5.4vw, 68px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--arc-pl-bright);
}

.arc-planet__summary {
  margin: 0;
  color: var(--arc-pl-muted);
  font-size: 15.5px;
  line-height: 1.6;
}

/* ---------- Log ---------- */

.arc-planet__log {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 16px 24px;
}

.arc-planet__entry {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 680px);
  gap: 12px 48px;
  padding: 34px 0 30px;
  border-top: 1px solid var(--arc-pl-line);
}

.arc-planet__entry h2 {
  margin: 4px 0 0;
  font-family: var(--arc-pl-mono);
  font-weight: 400;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--arc-pl-bright);
}

.arc-planet__entry h2 span {
  display: inline-block;
  min-width: 34px;
  color: var(--arc-pl-accent);
}

.arc-planet__body p {
  margin: 0 0 1.05em;
}

.arc-planet__body p:last-child {
  margin-bottom: 0;
}

.arc-planet__body strong {
  color: var(--arc-pl-bright);
  font-weight: 600;
}

.arc-planet__equation {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--arc-pl-line-strong);
  border-left: 2px solid var(--arc-pl-accent);
  font-family: var(--arc-pl-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--arc-pl-bright);
}

.arc-planet__equation span {
  font-style: italic;
}

.arc-planet__provenance {
  margin-top: 28px !important;
  padding-top: 16px;
  border-top: 1px dashed var(--arc-pl-line);
  font-family: var(--arc-pl-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
}

/* ---------- Footer ---------- */

.arc-planet__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 20px;
  max-width: 1240px;
  margin: 24px auto 0;
  padding: 14px 16px 36px;
  border-top: 1px solid var(--arc-pl-line);
  font-family: var(--arc-pl-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.arc-planet__footer p {
  margin: 0;
  color: var(--arc-pl-muted);
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .arc-planet__title {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .arc-planet__entry {
    grid-template-columns: minmax(0, 1fr);
    padding: 28px 0 24px;
  }
}

@media (max-width: 560px) {
  .arc-planet {
    font-size: 16px;
  }

  .arc-planet__bar,
  .arc-planet a.arc-planet__home {
    font-size: 10.5px;
    letter-spacing: 0.12em;
  }

  .arc-planet__readout {
    top: 22px;
    font-size: 9.5px;
    letter-spacing: 0.1em;
  }

  .arc-planet__readout--left { left: 24px; }
  .arc-planet__readout--right { right: 24px; }

  .arc-planet__readout div:first-child {
    display: none;
  }

  .arc-planet__readout dt {
    min-width: 0;
  }

  .arc-planet__readout dd {
    min-width: 0;
  }

  .arc-planet__notice {
    bottom: 22px;
    max-width: calc(100% - 40px);
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .arc-planet__live {
    animation: none;
  }
}