:root {
  --bg: #000;
  --ink: #f4f4ef;
  --muted: #b4b4bf;
  --accent: #d4ff3a;       /* acid lime */
  --accent-2: #ff4fd8;     /* hot pink */
  --error: #ff6b6b;
  --panel: rgba(4, 4, 8, 0.78);
  --panel-solid: #07070c;
  --line: rgba(255, 255, 255, 0.2);
  --font: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gutter: clamp(16px, 4vw, 48px);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
code, kbd {
  font-family: inherit;
  font-size: 0.9em;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.05em 0.35em;
  border-radius: 3px;
}
.muted { color: var(--muted); }

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

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: #000; padding: 0.5em 1em;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ── background layers ─────────────────────────────────────── */
#hydra-frame {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  border: 0; z-index: 0;
  pointer-events: none;
}
/* Stays at z-index 0 and main gets no z-index, so the hero title can blend with the visuals. */
.dim {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.55) 100%),
    rgba(0, 0, 0, 0.15);
  transition: opacity 0.4s;
}
body.no-webgl {
  background:
    radial-gradient(circle at 20% 30%, #4b1d6b, transparent 50%),
    radial-gradient(circle at 80% 70%, #0f5c5c, transparent 50%),
    #000;
}
body.no-webgl #hydra-frame { display: none; }

/* ── buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 0.4em;
  font: inherit; font-size: 0.9rem;
  color: var(--ink);
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid var(--ink);
  padding: 0.55em 1em;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--ink); color: #000; }
.btn--primary { background: var(--accent); color: #000; border-color: var(--accent); font-weight: 700; }
.btn--primary:hover { background: var(--ink); border-color: var(--ink); }
.btn--big { font-size: 1.05rem; padding: 0.75em 1.4em; }

/* ── hero ──────────────────────────────────────────────────── */
main { position: relative; transition: opacity 0.4s; }

.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 4rem var(--gutter);
  max-width: 1400px;
}
.kicker {
  margin: 0 0 1.2rem;
  color: var(--accent);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.kicker::before { content: "> "; }
.hero__title { margin: 0; font-weight: 800; }
.hero__name {
  display: block;
  font-size: clamp(4.5rem, 24vw, 12rem);
  line-height: 0.85;
  padding-bottom: 0.2em;   /* room for the cedilla in Ç */
  letter-spacing: -0.045em;
  overflow-wrap: anywhere;
  color: #fff;
  mix-blend-mode: difference;
  text-shadow: 3px 0 var(--accent-2), -3px 0 var(--accent);
  animation: jitter 3.2s steps(1) infinite;
}
.hero__subtitle {
  display: block;
  width: fit-content;
  font-size: clamp(1.2rem, 2.8vw, 1.9rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--accent);
  background: rgba(0, 0, 0, 0.8);
  padding: 0.1em 0.4em;
}
.hero__subtitle::before { content: "// "; opacity: 0.6; }
@keyframes jitter {
  0%, 88%, 100% { text-shadow: 3px 0 var(--accent-2), -3px 0 var(--accent); transform: none; }
  90% { text-shadow: -6px 0 var(--accent-2), 6px 0 var(--accent); transform: translateX(2px) skewX(-4deg); }
  93% { text-shadow: 8px 2px var(--accent-2), -4px -2px var(--accent); transform: translateX(-3px); }
  96% { text-shadow: 2px 0 var(--accent-2), -2px 0 var(--accent); transform: none; }
}
/* Inline "highlighter" boxes keep text readable over any visual. */
.hero__tagline {
  max-width: 46ch;
  margin: 2rem 0 0.8rem;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.6;
}
.hero__tagline > span, .hero__meta > span:not([aria-hidden]) {
  background: rgba(0, 0, 0, 0.8);
  padding: 0.15em 0.4em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.hero__meta { margin: 1rem 0 0; color: var(--accent); font-weight: 700; font-size: clamp(0.9rem, 1.3vw, 1rem); line-height: 1.5; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; margin: 2.2rem 0 0; }
.hero__actions .btn { font-size: 1rem; padding: 0.7em 1.2em; }
/* ── content blocks ────────────────────────────────────────── */
.block {
  width: min(760px, calc(100% - 2 * var(--gutter)));
  margin: 0 auto 28vh;
  padding: clamp(1.2rem, 3vw, 2rem);
  font-size: 0.88rem;
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  scroll-margin-top: 4.5rem;
}
.block--wide { width: min(1080px, calc(100% - 2 * var(--gutter))); }

/* ── registration form ─────────────────────────────────────── */
#contact { overflow-wrap: anywhere; }   /* long email: may wrap on phones */
.signup__review { border-left: 3px solid var(--accent); background: rgba(212, 255, 58, 0.08); padding: 0.6em 0.9em; }
.form { position: relative; display: grid; gap: 1.3rem; margin: 1.8rem 0 1.6rem; }
.field { display: grid; gap: 0.45rem; min-width: 0; margin: 0; padding: 0; border: 0; }
.field[hidden] { display: none; }
.field > label, .field legend { font-weight: 700; font-size: 1rem; }
.field legend { padding: 0; margin-bottom: 0.6rem; }
.form input:not([type="checkbox"]), .form textarea {
  width: 100%;
  font: inherit; font-size: 1rem;
  color: var(--ink); background: rgba(0, 0, 0, 0.65);
  border: 1px solid var(--line);
  padding: 0.7em 0.8em;
}
.form textarea { min-height: 7.5em; line-height: 1.5; resize: vertical; }
.form ::placeholder { color: #9a9aa6; }
.form input:focus-visible, .form textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 0; border-color: var(--accent); }
.form [aria-invalid="true"] { border-color: var(--error); }
.field__error { margin: 0; color: var(--error); font-size: 0.95rem; }
.field__error:empty { display: none; }
.check {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.2em 0.6em;
  margin-bottom: 0.5rem; padding: 0.6em 0.8em;
  font-size: 1rem; cursor: pointer;
  border: 1px solid var(--line);
}
.check input { width: 1.15em; height: 1.15em; accent-color: var(--accent); align-self: center; flex: none; }
.check:has(input:checked) { border-color: var(--accent); background: rgba(212, 255, 58, 0.08); }
.check__hint { color: var(--muted); font-size: 0.9rem; }
.check--all { border-style: dashed; }
.rank { margin: 0.9rem 0 0; padding: 0; border: 0; display: grid; gap: 0.4rem; }
.rank legend { padding: 0; margin-bottom: 0.5rem; font-weight: 700; }
.rank__row { display: flex; align-items: center; gap: 0.6rem; }
.rank select {
  font: inherit; color: var(--ink); background: rgba(0, 0, 0, 0.65);
  border: 1px solid var(--line); padding: 0.3em 0.4em; min-width: 4.2em;
}
.rank select:focus-visible { outline: 2px solid var(--accent); outline-offset: 0; }
.rank[data-invalid] select { border-color: var(--error); }
.rank label { cursor: pointer; }
.field[data-invalid] .check { border-color: var(--error); }
.form__trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form button[disabled] { opacity: 0.6; cursor: wait; }
.form__status { margin: 0; min-height: 1.4em; font-size: 1rem; }
.form__status[data-kind="error"] { color: var(--error); }
.form__thanks { margin: 0; padding: 1em 1.1em; font-size: 1.1rem; font-weight: 700; color: var(--accent); border: 2px solid var(--accent); }

/* ── the tied part: about + sign up (left) and workshops (right), joined by ropes ── */
.tied {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  column-gap: clamp(4rem, 9vw, 10rem);
  width: min(1280px, calc(100% - 2 * var(--gutter)));
  margin: 0 auto 28vh;
  align-items: start;
}
.tied__ropes { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.tie { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linecap: round; opacity: 0.85; transition: stroke-width 0.1s; }
.tied__ropes.is-hit .tie { stroke-width: 5; filter: drop-shadow(0 0 6px var(--accent)); }
.tied__col { position: relative; display: grid; gap: 8rem; align-content: start; }
.tied__col--right { margin-top: 16rem; scroll-margin-top: 2rem; }   /* offset, so the ropes zig-zag */
.tied .block { width: auto; margin: 0; }
.tied .workshops { margin: 0; grid-template-columns: 1fr; gap: 6rem; }
.tied .workshop { background: var(--panel); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); padding: 1.8rem; }
@media (max-width: 900px) {
  .tied { grid-template-columns: 1fr; }
  .tied__col--right { margin-top: 8rem; }
  .tied__col { gap: 6rem; }
}
.block h2 {
  margin: 0 0 1.4rem;
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.block h2::before { content: "## "; color: var(--accent); }
.block h2::after {
  content: "";
  display: block;
  margin-top: 0.6rem;
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 0.6em, transparent 0.6em 0.9em);
  opacity: 0.35;
}
.block h3 { margin: 1.6rem 0 0.5rem; font-size: 0.9rem; color: var(--accent); }
.block h3::before { content: "### "; opacity: 0.6; }
.prose p { margin: 0 0 1em; }
/* "laço /ˈla.su/ (Brazilian Portuguese): …" styled like a dictionary entry */
.about__def { font-size: 0.95rem; line-height: 1.6; padding-bottom: 1em; border-bottom: 1px dashed var(--line); }
.about__word { font-size: 1.1rem; color: var(--accent); }
.about__say { color: var(--muted); }
.prose p:last-child { margin-bottom: 0; }

.dash-list { list-style: none; padding: 0; margin: 0; }
/* the steps of a workshop session */
.session { list-style: none; margin: 0 0 1.2rem; padding: 0; display: grid; gap: 0.5rem; }
.session li { position: relative; padding-left: 2em; }
.session li::before { content: "//"; position: absolute; left: 0; color: var(--accent); font-weight: 700; opacity: 0.8; }
.session b { color: var(--ink); }
.where { margin: 0 0 1.2rem; padding: 0.7em 0.9em; border-left: 3px solid var(--accent-2); background: rgba(255, 79, 216, 0.07); }
.where__map { display: inline-block; margin-top: 0.4rem; font-weight: 700; }
.dash-list li::before { content: "- "; color: var(--accent); }

/* ── workshops ─────────────────────────────────────────────── */
.workshops {
  list-style: none; margin: 2rem 0 0; padding: 0;
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}
.workshop {
  position: relative;
  height: 100%;
  display: flex; flex-direction: column;
  padding: 1.4rem;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.5);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.workshop.is-active {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 0 40px -10px var(--accent);
}
.workshop__num {
  font-size: 2.2rem; font-weight: 800; line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--accent);
}
.workshop.is-active .workshop__num { color: var(--accent); }
.workshop__title { margin: 0.7rem 0 0.8rem; font-size: 0.95rem; line-height: 1.3; }
.block .workshop__title { color: var(--ink); }
.block .workshop__title::before { content: none; }
.workshop__meta { display: grid; gap: 0.2rem; margin: 0 0 0.9rem; font-size: 0.82rem; }
.workshop__meta div { display: grid; grid-template-columns: 4.5em 1fr; gap: 0.5em; }
.workshop__meta dt { color: var(--muted); }
.workshop__meta dt::after { content: ":"; }
.workshop__meta dd { margin: 0; }
.workshop p { margin: 0 0 0.8em; font-size: 0.85rem; }
.workshop__actions { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: auto; padding-top: 0.8rem; }
.workshop__actions .btn { font-size: 0.8rem; }

.footer {
  width: min(760px, calc(100% - 2 * var(--gutter)));
  margin: 0 auto;
  padding: 2rem 0 8rem;
  font-size: 0.85rem;
  text-align: center;
}
.footer p { display: inline-block; background: rgba(0, 0, 0, 0.7); padding: 0.2em 0.6em; margin: 0.2rem; }

/* ── floating controls: the knot tags ─────────────────────── */
.toys { position: fixed; inset: 0; z-index: 20; pointer-events: none; }
.toys > * { pointer-events: auto; }
.toys .toys__svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.toys button { font: inherit; touch-action: none; user-select: none; -webkit-user-select: none; }

.rope { fill: none; stroke: rgba(255, 255, 255, 0.35); stroke-width: 1.5; }
.rail { stroke: rgba(255, 255, 255, 0.35); stroke-width: 1.5; stroke-dasharray: 4 5; }
.bond { fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; transition: stroke-width 0.1s; }
.is-hit .bond { stroke-width: 6; filter: drop-shadow(0 0 6px var(--accent)); }
/* The knots live on the first screen only and scroll away with it,
   so the sections below stay clear. */
.toys[data-mode="knots"] { position: absolute; inset: 0 0 auto 0; height: 100svh; }
.toys[data-mode="knots"] .loop { position: absolute; }   /* the loop scrolls away too, so it never covers the workshops */
.toys[data-mode="knots"] .loop { pointer-events: none; }   /* display only here: clicks pass through to the page */

/* A hanging tag: a hole at the top for the string, the word, and its code. */
.knot {
  position: absolute; top: 0; left: 0;
  width: 116px; height: 58px; margin: -29px 0 0 -58px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px;
  padding-top: 10px;
  border-radius: 6px 6px 12px 12px;
  color: var(--ink);
  background: rgba(0, 0, 0, 0.88);
  border: 2px dashed rgba(255, 255, 255, 0.5);
  cursor: grab;
  will-change: transform;
}
.knot::before {
  content: ""; position: absolute; top: 5px; left: 50%;
  width: 9px; height: 9px; margin-left: -6.5px;
  border-radius: 50%; border: 2px solid currentColor; opacity: 0.7;
}
.knot__word { font-size: 0.88rem; font-weight: 800; letter-spacing: 0.04em; text-transform: uppercase; line-height: 1.1; }
.knot__code { font-size: 0.66rem; opacity: 0.85; white-space: nowrap; }
.knot:active { cursor: grabbing; }
.knot.is-tied { color: #000; background: var(--accent); border: 2px solid var(--accent); box-shadow: 0 0 24px -4px var(--accent); }
.knot--visual.is-tied { background: var(--accent-2); border-color: var(--accent-2); box-shadow: 0 0 24px -4px var(--accent-2); }
.knot.is-tied .knot__code { opacity: 1; }
/* being carried by the wind */
.knot.is-carried { border: 2px solid var(--accent-2); box-shadow: 0 0 0 4px rgba(255, 79, 216, 0.35), 0 0 28px var(--accent-2); color: var(--ink); }

.loop {
  position: fixed; right: 1rem; bottom: 5.8rem;
  width: min(360px, calc(100% - 2rem));
  padding: 0.5rem 0.8rem 0.6rem;
  font-size: 0.8rem;
  background: rgba(4, 4, 8, 0.88);
  border: 2px solid var(--line);
  border-radius: 999px / 60px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.loop.is-hit { border-color: rgba(212, 255, 58, 0.7); }
.loop__title { margin: 0 0 0.2rem; font-weight: 700; color: var(--accent); text-align: center; }
.loop__line { margin: 0.2rem 0.6rem; overflow-wrap: anywhere; line-height: 1.7; }
.loop__kind { color: var(--muted); margin-right: 0.5em; }
.loop__piece { display: inline-block; white-space: nowrap; line-height: 1.4; color: #000; background: var(--accent); padding: 0.05em 0.35em; margin: 0.1em 0.1em; }
.loop__piece--visual { background: var(--accent-2); }


/* ── live-code panel ───────────────────────────────────────── */
.code {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 40;
  display: flex; flex-direction: column; align-items: flex-end;
  pointer-events: none;
}
.code > * { pointer-events: auto; }
.code__bar { display: flex; gap: 0.5rem; }
.code__sound, .code__toggle {
  font: inherit; font-size: 0.85rem; font-weight: 700;
  padding: 0.65em 1.1em;
  cursor: pointer;
  white-space: nowrap;
}
.code__sound { background: var(--accent); color: #000; border: 1px solid var(--accent); }
.code__toggle { background: rgba(0, 0, 0, 0.75); color: var(--ink); border: 1px solid var(--ink); }
.code__sound:hover, .code__toggle:hover { background: var(--ink); border-color: var(--ink); color: #000; }
.code[data-open="true"] .code__toggle { background: var(--ink); color: #000; }
.code[data-open="true"] .code__toggle::after { content: " ✕"; }
/* Open: the panel reaches up to the top of the screen. */
.code[data-open="true"] { top: 1rem; }
.code__body {
  flex: 1;
  min-height: 0;
  display: flex; flex-direction: column;
  width: min(600px, calc(100vw - 2rem));
  margin-bottom: 0.5rem;
  order: -1;
  background: rgba(7, 7, 12, 0.94);
  border: 1px solid var(--accent);
  box-shadow: 0 10px 50px rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.code__body[hidden] { display: none; }
.code__head {
  display: flex; align-items: center; justify-content: space-between; gap: 0.5rem;
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
}
.code__head [role="tab"] {
  font: inherit; color: var(--muted);
  background: none; border: 0;
  padding: 0.7em 1em;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.code__head [role="tab"][aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.code__scene { color: var(--muted); padding-right: 0.8em; white-space: nowrap; }
.code__scene span { color: var(--ink); }
.code__area {
  display: block; width: 100%;
  flex: 1;
  min-height: 8rem;
  margin: 0; padding: 0.9rem 1rem;
  font: inherit; font-size: 1rem; line-height: 1.6;
  color: var(--ink); caret-color: var(--accent);
  background: rgba(0, 0, 0, 0.7);
  border: 0; resize: none;
  white-space: pre; overflow: auto; tab-size: 2;
}
.code__area:focus-visible { outline: 1px solid var(--accent); outline-offset: -1px; }
.code__area[hidden] { display: none; }
.code__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; padding: 0.7rem 0.8rem 0.3rem; }
.code__actions .btn { font-size: 1rem; padding: 0.45em 0.9em; }
.code__follow { margin-left: auto; font-size: 0.95rem; color: var(--muted); display: flex; align-items: center; gap: 0.35em; cursor: pointer; }
.code__follow input { accent-color: var(--accent); }
.code__status { margin: 0; padding: 0.3rem 0.9rem; min-height: 1.6em; font-size: 0.95rem; color: var(--muted); overflow-wrap: anywhere; }
.code__status[data-kind="ok"] { color: var(--accent); }
.code__status[data-kind="error"] { color: var(--error); }
.code__keys { margin: 0; padding: 0 0.9rem 0.7rem; font-size: 0.85rem; }

/* ── modes ─────────────────────────────────────────────────── */

body.still .hero__name { animation: none; }
@media (prefers-reduced-motion: reduce) {
  .hero__name { animation: none; }
}

/* ── tablets held upright: text on top, the tags' band below it (like phones) ── */
@media (min-width: 701px) and (max-width: 1100px) and (orientation: portrait) {
  .hero { justify-content: flex-start; padding-top: 6rem; padding-bottom: 460px; }
  .toys[data-mode="knots"] .loop { bottom: 1.5rem; }
}

/* ── small screens ─────────────────────────────────────────── */
@media (max-width: 700px) {
  .loop { right: 0.5rem; left: 0.5rem; width: auto; bottom: 4.6rem; font-size: 0.9rem; }
  /* Phones: the opening text sits on top, then a band for the tags, then the loop. */
  .hero { justify-content: flex-start; padding-top: 4.5rem; padding-bottom: 480px; }
  .toys[data-mode="knots"] .loop { bottom: 1.5rem; }
  .knot { width: 110px; height: 58px; margin: -29px 0 0 -55px; padding-top: 7px; }
  .knot__word { font-size: 0.95rem; }
  .knot__code { font-size: 0.68rem; }
  .code { left: 0; right: 0; bottom: 0; align-items: stretch; }
  .code__bar { margin: 0 1rem 1rem; justify-content: flex-end; }
  .code__sound, .code__toggle { font-size: 0.9rem; padding: 0.65em 0.9em; }
  .code[data-open="true"] .code__bar { margin: 0; }
  .code[data-open="true"] .code__bar > * { flex: 1; }
  .code__body { width: 100%; margin: 0; border-width: 1px 0 0; }
  .code[data-open="true"] { top: 0; }
  .block { margin-bottom: 18vh; }
}