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feat(registry): add the lt-neon-border lower third #3108

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feat(registry): add the lt-neon-border lower third #3108

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390 changes: 390 additions & 0 deletions registry/blocks/lt-neon-border/lt-neon-border.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
background: transparent;
overflow: hidden;
}
body {
width: 1920px;
height: 1080px;
font-family: "Inter", sans-serif;
}

#root .nb-wrap {
position: absolute;
left: 50px;
bottom: 56px;
width: 1120px;
height: 510px;
}
#root .nb-svg {
position: absolute;
inset: 0;
display: block;
}
/* The frame's inner box, inset by the bloom padding so the copy lands
inside the traced rectangle. */
#root .nb-panel {
position: absolute;
left: 150px;
top: 150px;
width: 820px;
height: 210px;
display: flex;
flex-direction: column;
justify-content: center;
gap: 14px;
padding: 0 52px;
}
#root .nb-name {
display: block;
font-size: 54px;
font-weight: 700;
color: #ffffff;
line-height: 1;
letter-spacing: -0.015em;
white-space: nowrap;
text-shadow: 0 2px 20px rgba(0, 0, 0, 0.75);
}
#root .nb-role {
display: block;
font-size: 25px;
font-weight: 400;
color: #d5dae3;
line-height: 1.2;
letter-spacing: 0.06em;
text-transform: uppercase;
white-space: nowrap;
text-shadow: 0 2px 16px rgba(0, 0, 0, 0.75);
}
</style>
</head>
<body>
<div
id="root"
data-composition-id="lt-neon-border"
data-composition-variables='[
{"id":"name","type":"string","label":"Name","default":"Dr. Maya Chen"},
{"id":"role","type":"string","label":"Role","default":"Host · Neuroscientist"},
{"id":"accent","type":"color","label":"Accent","default":"#cc9149"},
{"id":"movement","type":"enum","label":"Movement","default":"step","options":[{"value":"step","label":"Step (snap at corners)"},{"value":"glide","label":"Glide (smooth)"}]},
{"id":"speed","type":"number","label":"Speed","default":1.6,"min":0.2,"max":6,"step":0.1,"unit":"corners/s"},
{"id":"cornerRadius","type":"number","label":"Corner radius","default":26,"min":0,"max":90,"step":1,"unit":"px"},
{"id":"thickness","type":"number","label":"Thickness","default":5,"min":1,"max":16,"step":1,"unit":"px"},
{"id":"arcLength","type":"number","label":"Arc length","default":22,"min":5,"max":100,"step":1,"unit":"%"},
{"id":"glow","type":"number","label":"Glow","default":1,"min":0,"max":2,"step":0.05,"unit":"x"}
]'
data-start="0"
data-duration="4.8"
data-width="1920"
data-height="1080"
>
<div id="nb-clip" class="clip" data-start="0" data-duration="4.8" data-track-index="0">
<div id="nb-wrap" class="nb-wrap">
<svg
id="nb-svg"
class="nb-svg"
width="1120"
height="510"
viewBox="0 0 1120 510"
fill="none"
aria-hidden="true"
>
<defs>
<g id="nb-seg-a-glow"></g>
<g id="nb-seg-a-core"></g>
<g id="nb-seg-b-glow"></g>
<g id="nb-seg-b-core"></g>
</defs>
<g transform="translate(150,150)">
<!-- Wide bloom sits UNDER the panel so the halo reads outside the
frame and the interior stays hardware-clean. -->
<g id="nb-bloom-under"></g>
<path id="nb-fill" d="" fill="rgba(9,11,15,0.78)" />
<path id="nb-rail" d="" fill="none" stroke-linejoin="round" />
<g id="nb-bloom-over"></g>
</g>
</svg>
<div id="nb-panel" class="nb-panel">
<span id="nb-name" class="nb-name" data-var-text="name">Dr. Maya Chen</span>
<span id="nb-role" class="nb-role" data-var-text="role">Host · Neuroscientist</span>
</div>
</div>
</div>
</div>

<script>
(function () {
window.__timelines = window.__timelines || {};

var SVG_NS = "http://www.w3.org/2000/svg";
var W = 820; // traced rectangle width
var H = 210; // traced rectangle height
var DUR = 4.8;

var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};

function num(v, fallback) {
var n = typeof v === "number" ? v : parseFloat(v);
return isFinite(n) ? n : fallback;
}

var accent = /^#[0-9a-fA-F]{6}$/.test(String(vars.accent))
? String(vars.accent)
: "#cc9149";
var mode = vars.movement === "glide" ? "glide" : "step";
var speed = Math.max(0.05, num(vars.speed, 1.6)); // corners per second
var radius = Math.min(Math.min(W, H) / 2, Math.max(0, num(vars.cornerRadius, 26)));
var thickness = Math.max(0.5, num(vars.thickness, 5));
var arcFrac = Math.min(1, Math.max(0.02, num(vars.arcLength, 22) / 100));
var glow = Math.max(0, num(vars.glow, 1));

// Hot core: the accent lifted most of the way to white, the way a real
// filament reads brighter than its halo.
function towardWhite(hex, amount) {
var v = parseInt(hex.slice(1), 16);
var out = "#";
for (var s = 16; s >= 0; s -= 8) {
var c = (v >> s) & 255;
var m = Math.round(c + (255 - c) * amount);
out += (m < 16 ? "0" : "") + m.toString(16);
}
return out;
}
var hot = towardWhite(accent, 0.78);

// ---- geometry -------------------------------------------------------
// Rounded rect, clockwise, starting where the top edge leaves the
// top-left corner arc.
var r = radius;
var arc = "A " + r + " " + r + " 0 0 1 ";
var d = [
"M " + r + " 0",
"H " + (W - r),
arc + W + " " + r,
"V " + (H - r),
arc + (W - r) + " " + H,
"H " + r,
arc + "0 " + (H - r),
"V " + r,
arc + r + " 0",
"Z",
].join(" ");

var fillEl = document.getElementById("nb-fill");
var railEl = document.getElementById("nb-rail");
fillEl.setAttribute("d", d);
railEl.setAttribute("d", d);
railEl.setAttribute("stroke", accent);
railEl.setAttribute("stroke-width", String(thickness));
railEl.setAttribute("stroke-opacity", "0.14");

// Analytic perimeter, then rescaled to whatever length the renderer
// actually measures for the path so dash distances line up exactly.
var SW = W - 2 * r; // straight run, horizontal
var SH = H - 2 * r; // straight run, vertical
var AC = (Math.PI * r) / 2; // one corner arc
var P_ANALYTIC = 2 * SW + 2 * SH + 4 * AC;
var P = railEl.getTotalLength() || P_ANALYTIC;
var K = P / P_ANALYTIC;

// Distance along the path of the MIDPOINT of each corner arc, so the
// light parks centred on the corner rather than skidding past it.
var CORNERS = [
(SW + AC / 2) * K, // top-right
(SW + SH + 1.5 * AC) * K, // bottom-right
(2 * SW + SH + 2.5 * AC) * K, // bottom-left
(2 * SW + 2 * SH + 3.5 * AC) * K, // top-left
];

/** Absolute path distance of corner k, for any integer k (k may be
* negative or beyond one lap). Pure function of k — no accumulator. */
function cornerPos(k) {
var lap = Math.floor(k / 4);
var i = k - lap * 4;
return CORNERS[i] + lap * P;
}

// ---- easing ---------------------------------------------------------
// The step curve overshoots (y2 = 1.05); that overshoot IS the snap.
function cubicBezier(x1, y1, x2, y2) {
function axis(t, a, b) {
var u = 1 - t;
return 3 * u * u * t * a + 3 * u * t * t * b + t * t * t;
}
return function (x) {
if (x <= 0) return 0;
if (x >= 1) return 1;
var lo = 0;
var hi = 1;
var t = x;
// Fixed iteration count: same input, same output, every run.
for (var i = 0; i < 32; i++) {
t = (lo + hi) / 2;
if (axis(t, x1, x2) < x) lo = t;
else hi = t;
}
return axis(t, y1, y2);
};
}
var ease =
mode === "glide" ? cubicBezier(0.65, 0, 0.35, 1) : cubicBezier(0.72, 0.16, 0.18, 1.05);

var beat = 1 / speed; // seconds per corner hop

/** Head position (path distance) at time t. floor/frac of t/beat is the
* closed form of the reference's `stepT += dt` accumulator. */
function headAt(t) {
var total = t / beat;
var k = Math.floor(total);
var u = total - k;
var a = cornerPos(k);
var b = cornerPos(k + 1);
return a + (b - a) * ease(u);
}

// ---- arc construction ----------------------------------------------
// Each arc is a run of abutting dash segments whose opacity falls off
// behind the head; that ramp is the taper. Geometry lives once in
// <defs> and is shared by every bloom layer through <use>.
function buildSegments(groupId, count, falloff) {
var g = document.getElementById(groupId);
var segs = [];
for (var i = 0; i < count; i++) {
var p = document.createElementNS(SVG_NS, "path");
p.setAttribute("d", d);
p.setAttribute("fill", "none");
p.setAttribute("stroke-linecap", i === 0 ? "round" : "butt");
p.setAttribute("opacity", String(Math.pow(1 - i / count, falloff)));
g.appendChild(p);
segs.push(p);
}
return segs;
}

var GLOW_SEGS = 20;
var CORE_SEGS = 26;
var glowLen = arcFrac * P;
var coreLen = 0.34 * glowLen;

var arcs = [
{
offset: 0,
glow: buildSegments("nb-seg-a-glow", GLOW_SEGS, 2.6),
core: buildSegments("nb-seg-a-core", CORE_SEGS, 1.4),
},
{
// Half a lap behind: the diametrically opposite corner. The pairing
// is most of why the effect reads as designed rather than random.
offset: 2,
glow: buildSegments("nb-seg-b-glow", GLOW_SEGS, 2.6),
core: buildSegments("nb-seg-b-core", CORE_SEGS, 1.4),
},
];

// Three stacked bloom layers (soft / medium / wide) plus the filament.
// `spread` widens the stroke before it is blurred — that pairing, not
// the blur alone, is what makes the halo read as emitted light.
var MAX_REACH = 36;
var LAYERS = [
{ blur: 30, spread: 1, opacity: 0.18, stroke: accent, deep: true },
{ blur: 15, spread: 0.6, opacity: 0.3, stroke: accent, deep: true },
{ blur: 8, spread: 0.3, opacity: 0.5, stroke: accent, deep: true },
{ blur: 4, spread: 0.05, opacity: 0.9, stroke: hot, core: true },
{ blur: 0, spread: -0.012, opacity: 1, stroke: "#ffffff", core: true },
];

var under = document.getElementById("nb-bloom-under");
var over = document.getElementById("nb-bloom-over");
["a", "b"].forEach(function (tag) {
LAYERS.forEach(function (layer) {
var u = document.createElementNS(SVG_NS, "use");
u.setAttribute("href", "#nb-seg-" + tag + "-" + (layer.core ? "core" : "glow"));
u.setAttribute("stroke", layer.stroke);
u.setAttribute(
"stroke-width",
String(Math.max(0.5, thickness + 2 * layer.spread * MAX_REACH * glow)),
);
u.setAttribute("opacity", String(Math.min(1, layer.opacity * glow)));
if (layer.blur > 0) u.style.filter = "blur(" + layer.blur + "px)";
(layer.deep ? under : over).appendChild(u);
});
});

/** Lay a segment run out behind `head`. Every value derives from head. */
function layout(segs, head, length) {
var step = length / segs.length;
for (var i = 0; i < segs.length; i++) {
var start = head - (i + 1) * step;
start = ((start % P) + P) % P;
segs[i].setAttribute("stroke-dasharray", step + " " + (P - step));
segs[i].setAttribute("stroke-dashoffset", String(-start));
}
}

function render(t) {
for (var i = 0; i < arcs.length; i++) {
var head = headAt(t + arcs[i].offset * beat);
layout(arcs[i].glow, head, glowLen);
layout(arcs[i].core, head, coreLen);
}
}

// ---- timeline -------------------------------------------------------
var wrap = document.getElementById("nb-wrap");
var panel = document.getElementById("nb-panel");
var nameEl = document.getElementById("nb-name");
var roleEl = document.getElementById("nb-role");

var tl = gsap.timeline({ paused: true });

gsap.set(wrap, { opacity: 0, scale: 0.965, transformOrigin: "0% 100%" });
gsap.set(nameEl, { y: 18, opacity: 0 });
gsap.set(roleEl, { y: 12, opacity: 0 });

// The driver: linear, spans the whole clip, and every arc position is
// recomputed from its own time value. Seeking to frame N gives the same
// state as playing to frame N because nothing carries over.
var driver = { t: 0 };
tl.to(
driver,
{
t: DUR,
duration: DUR,
ease: "none",
onUpdate: function () {
render(driver.t);
},
},
0,
);

tl.to(wrap, { opacity: 1, scale: 1, duration: 0.55, ease: "power3.out" }, 0.08);
tl.to(nameEl, { y: 0, opacity: 1, duration: 0.5, ease: "power3.out" }, 0.3);
tl.to(roleEl, { y: 0, opacity: 1, duration: 0.5, ease: "power3.out" }, 0.44);

tl.to(roleEl, { y: -10, opacity: 0, duration: 0.3, ease: "power2.in" }, 4.24);
tl.to(nameEl, { y: -14, opacity: 0, duration: 0.32, ease: "power2.in" }, 4.3);
tl.to(wrap, { opacity: 0, scale: 0.985, duration: 0.36, ease: "power2.in" }, 4.36);
tl.set(panel, { visibility: "hidden" }, 4.76);

render(0);

window.__timelines["lt-neon-border"] = tl;
})();
</script>
</body>
</html>
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