/* slosh.foo — one page, one stylesheet, no build step.
 *
 * The palette is contrib/themes/sl0p.kdl — hot pink on near-black — so the
 * page and the thing it describes agree. Deliberately not a landing page:
 * no gradients, no cards, no icons, nothing floats in on scroll. */

:root {
  --bg: #0b0b0e;
  --panel: #141418;
  --code-bg: #1c1c22;
  --fg: #e8e8ea;
  --dim: #8a8a95;
  --faint: #45454a;
  --pink: #ff5fd7;
  --dead: #ff875f;
  /* The feature tour's geometry, up here because the floating logo (a fixed
   * element, outside the tour) centres itself on the tour's stage column. */
  --tour-w: min(94vw, 88rem);
  --tour-gap: clamp(1.5rem, 4vw, 4.5rem);
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
          "DejaVu Sans Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--pink); text-decoration: none; }
a:hover { text-decoration: underline; }

code, kbd, pre { font-family: var(--mono); }
code { font-size: 0.9em; }

kbd {
  padding: 0.05em 0.35em;
  border: 1px solid var(--faint);
  border-radius: 3px;
  background: var(--panel);
  color: var(--pink);
  font-size: 0.85em;
}

/* ---- the floating logo ---------------------------------------------- */
/* The hero logo again, small, in the corner the stage's v-centering leaves
 * empty on desktop. Faded in by the observer in index.html once the big one
 * is off screen; a link back to the top. Hidden on one-column screens,
 * where that corner is content, not air. */

.logo-float {
  position: fixed;
  /* The resting value only: the script centres it in the air between the
   * viewport top and the pinned terminal's top edge, which no fixed number
   * tracks across viewport heights. */
  top: 13.8rem;
  /* Centred on the stage column: the tour is layout-centred and the stage
   * is the 3fr of its 3fr/2fr split, so the terminal's midline sits at
   * 50% - tourW/2 + (tourW - gap) * 3/10. 50%, not 50vw: a fixed element's
   * percentages exclude the scrollbar, like the layout the tour centres in;
   * vw would drag the logo half a scrollbar to the right. The translateX
   * does the logo's own half. */
  left: calc(50% - var(--tour-w) / 2 + (var(--tour-w) - var(--tour-gap)) * 0.3);
  z-index: 4;
  color: var(--pink);
  opacity: 0;
  transform: translateX(-50%) translateY(-0.4rem);
  transition: opacity 0.25s, transform 0.25s;
  pointer-events: none;
}
.logo-float.show { opacity: 1; transform: translateX(-50%); pointer-events: auto; }
/* A link, but not dressed as one: underlining seven rows of block glyphs
 * (the global a:hover) is a mess, and a colour flash is not much better.
 * The pointer cursor alone says clickable. */
.logo-float:hover { text-decoration: none; }
.logo-float pre {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1em;
  /* Block glyphs' ink can round a hair narrower than the advance width,
   * leaving pinstripe gaps between ██; tuck each glyph into the last. */
  letter-spacing: -0.05em;
  /* The colour cycles, slowly: a gradient of the pink's neighbours clipped
   * to the ink and slid along it -- the logo's own little colour pass, in
   * the spirit of the shaders it advertises. Horizontal on purpose: the
   * loop shifts by exactly one tile (at background-size 200%, position
   * 200% is one tile width), and only a 90deg gradient meets its own edge
   * seamlessly. */
  background: linear-gradient(90deg,
      var(--pink) 0%, #c95fff 18%, #5fafff 38%, #5fd7d7 52%,
      #87ffd7 62%, #ff87e7 82%, var(--pink) 100%);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
/* Two motions. The position slide scrolls the gradient through the ink --
 * except in WebKit, which caches a text-clipped paint and never repaints it
 * for a background-position animation, leaving the wash frozen. The hue
 * rotation is the motion Safari does honour: filters run post-paint on the
 * compositor, so every pixel cycles the wheel even over the cached clip.
 * Chrome and Firefox get both, WebKit gets the rotation alone. */
.logo-float.show pre {
  animation: logo-cycle 8s linear infinite, logo-hue 12s linear infinite;
}
@keyframes logo-cycle {
  from { background-position: 0% 0; }
  to { background-position: 200% 0; }
}
@keyframes logo-hue {
  from { filter: hue-rotate(0deg); }
  to { filter: hue-rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
  .logo-float.show pre { animation: none; }
}

@media (max-width: 54rem) {
  .logo-float { display: none; }
}

/* ---- the hero ------------------------------------------------------- */

main {
  max-width: 60rem;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.hero {
    padding: 3.5rem 0 1rem; 
    text-align:center !important;
}

.hero .logo {
    color: var(--pink);
    line-height: 1em;
    letter-spacing: -0.05em; /* see .logo-float pre */
}

.hero h1 {
  margin: 0;
  color: var(--pink);
  font-family: var(--mono);
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.tagline {
  margin: 0.5rem 0 0;
  color: var(--dim);
  font-size: 1.05rem;
}

.hero-links { margin: 2rem 0 0; }

.btn {
  display: inline-block;
  margin-right: 0.75rem;
  padding: 0.35rem 1.1rem;
  background: var(--pink);
  color: var(--panel);
  font-family: var(--mono);
  font-size: 14px;
}
.btn:hover { background: #fff; text-decoration: none; }

.btn.ghost {
  background: transparent;
  border: 1px solid var(--faint);
  color: var(--dim);
}
.btn.ghost:hover { border-color: var(--pink); color: var(--pink); background: transparent; }

/* ---- sections ------------------------------------------------------- */

section { margin: 3.5rem 0 0; }

section h2 {
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--panel);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 1.1rem;
  font-weight: 600;
}

section p { max-width: 44rem; }
section > p:last-child { margin-bottom: 0; }

.aside { color: var(--dim); font-size: 0.95rem; }

/* ---- the install box ------------------------------------------------- */
/* Pick a platform, read only its instructions. Hidden radios, labels drawn
 * like a slosh tab strip, one panel each; the switching is CSS. */

.install {
  margin: 1rem 0;
  border: 1px solid var(--panel);
  border-radius: 4px;
  background: var(--bg);
}

.install > .os {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.os-tabs {
  display: flex;
  gap: 0.35rem;
  overflow-x: auto;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid var(--panel);
  font-family: var(--mono);
  font-size: 13px;
}

.os-tabs label {
  padding: 0.05rem 0.7rem;
  border-radius: 3px;
  color: var(--dim);
  cursor: pointer;
  white-space: nowrap;
}
.os-tabs label:hover { color: var(--pink); }

.install > .os:focus-visible ~ .os-tabs { outline: 1px solid var(--pink); }

.os-panel { display: none; padding: 0.4rem 1rem 0.9rem; }
.os-panel .cmd { margin: 0.6rem 0; }
.os-panel .aside { margin: 0.6rem 0 0; font-size: 0.9rem; }

/* the checked radio lights its tab and shows its panel */
#os-linux:checked   ~ .os-tabs label[for="os-linux"],
#os-macos:checked   ~ .os-tabs label[for="os-macos"],
#os-arch:checked    ~ .os-tabs label[for="os-arch"],
#os-windows:checked ~ .os-tabs label[for="os-windows"],
#os-source:checked  ~ .os-tabs label[for="os-source"] {
  background: var(--pink);
  color: var(--panel);
}
#os-linux:checked   ~ #install-linux,
#os-macos:checked   ~ #install-macos,
#os-arch:checked    ~ #install-arch,
#os-windows:checked ~ #install-windows,
#os-source:checked  ~ #install-source { display: block; }

/* ---- command blocks ------------------------------------------------- */

.cmd {
  position: relative;
  margin: 1rem 0;
  border: 1px solid var(--code-bg);
  border-radius: 4px;
  background: var(--code-bg);
}

.cmd pre {
  margin: 0;
  padding: 0.8rem 1rem;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
}

.cmd .prompt { color: var(--faint); user-select: none; }
.cmd .c { color: var(--dim); }

.copy {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  padding: 0.1rem 0.6rem;
  border: 1px solid var(--faint);
  border-radius: 3px;
  background: var(--panel);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 12px;
  cursor: pointer;
}
.copy:hover { border-color: var(--pink); color: var(--pink); }

/* ---- the feature tour ----------------------------------------------- */
/* A terminal pinned to the left half, vertically centred; the features
 * scroll by on the right. Wider than the text column on purpose — the
 * recordings are 100 columns and want the room. */

.scrolly {
  width: var(--tour-w);
  margin-left: calc((100% - var(--tour-w)) / 2);
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: var(--tour-gap);
  /* Tuck the tour up under the hero. The stage's 100vh box centres the
   * terminal, so before it pins, everything above the terminal is air —
   * about 45vh minus half the player (≤ ~500px tall at this column width),
   * minus the optical lift. Overlap the hero by that much, less ~2rem of
   * breathing room; min() keeps it at 0 on viewports short enough that the
   * air runs out. Pinned geometry is scroll-invariant, so alignment inside
   * the tour is untouched. */
  margin-top: min(0rem, 17.5rem - 45vh);
  /* ...and the same at the exit, where the air below the terminal is larger
   * still (the optical lift rides it high — ~54.5vh minus half the player).
   * This collapses with the next section's 3.5rem margin-top, which the
   * constant accounts for; the result is ~2.75rem from the terminal's final
   * resting bottom to the install heading at any viewport height. */
  margin-bottom: min(0rem, 14.5rem - 54.5vh);
  /* The overlapped regions are transparent air, but they would still sit on
   * top of the hero's buttons above and the install tabs below — let clicks
   * fall through, and switch hit-testing back on for the things inside that
   * want it. */
  pointer-events: none;
}
.stage-pin [data-sloshcast],
.scrolly-steps .step { pointer-events: auto; }

.stage-pin {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  /* Sit a touch above true centre: the steps on the right centre their text
   * on the viewport, and against them a dead-centred terminal reads as low
   * (the tab strip weights its top). border-box, so this lifts the centred
   * content rather than growing the 100vh box. */
  padding-bottom: clamp(2.5rem, 9vh, 6rem);
}

.stage-pin [data-sloshcast] { display: none; }
.stage-pin .stage-active { display: block; }

/* Breathing room at both ends of the steps column. Without it the column is
 * exactly steps*50vh tall and the sticky stage has no travel margin: the
 * terminal is still riding below centre when the first step reaches the
 * middle of the viewport, and has already been dragged up past centre by the
 * container's bottom edge when the last one does. 25vh each side means the
 * stage is pinned (centred) from before the first step centres until after
 * the last step does. */
.scrolly-steps { padding: 25vh 0; }

.step {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: 0.3;
  transition: opacity 0.25s;
}
.step.active { opacity: 1; }

.step h3 {
  margin: 0;
  color: var(--fg);
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  font-weight: 650;
  line-height: 1.25;
}

.step p {
  margin: 0.8rem 0 0;
  color: var(--dim);
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  line-height: 1.6;
}

.step ul {
  margin: 1rem 0 0;
  padding-left: 1.2em;
  color: var(--dim);
  font-size: clamp(0.98rem, 1.25vw, 1.1rem);
  line-height: 1.55;
}
.step li { margin: 0.35rem 0; }
.step li::marker { color: var(--pink); }

/* The tour's exit: back up to the install box, or into the browser demo. */
.step-cta { min-height: 45vh; }
.step-cta .hero-links { margin-top: 1.5rem; }

@media (max-width: 54rem) {
  /* One column: the terminal sticks under the nav, the features scroll
   * beneath it. The sticky moves up to .scrolly-stage here: in block layout
   * .stage-pin's parent is only as tall as the player, so a sticky inside it
   * has nowhere to stick; .scrolly-stage is bounded by the whole tour. */
  .scrolly { display: block; margin-top: 0; margin-bottom: 0; pointer-events: auto; }
  .scrolly-stage {
    position: sticky;
    top: 0;
    z-index: 2;
    padding: 0.6rem 0;
    background: var(--bg);
  }
  .stage-pin {
    position: static;
    height: auto;
    padding: 0;
  }
  /* One column: the stage sticks above the steps, so the travel margin is
   * pointless air here. */
  .scrolly-steps { padding: 0; }
  .step { min-height: 50vh; }
  .step:first-child { padding-top: 1.5rem; }
}

/* ---- the points list ------------------------------------------------ */

.points { margin: 0.5rem 0 1.25rem; }

.points dt {
  margin-top: 1.1rem;
  color: var(--fg);
  font-weight: 600;
}
.points dt:first-child { margin-top: 0; }

.points dd {
  margin: 0.15rem 0 0;
  max-width: 44rem;
  color: var(--dim);
}

/* ---- the docs list -------------------------------------------------- */

.doclist {
  margin: 0.5rem 0 0;
  padding: 0;
  list-style: none;
  columns: 2;
  column-gap: 2.5rem;
}

.doclist li {
  margin: 0.35rem 0;
  break-inside: avoid;
  font-size: 0.95rem;
}

.doclist a { font-family: var(--mono); font-size: 14px; }
.doclist span { color: var(--faint); }

/* ---- small screens -------------------------------------------------- */

@media (max-width: 44rem) {
  .doclist { columns: 1; }
}