/* Copyright (c) 2025 by Matt Cannon (https://codepen.io/matt-cannon/pen/OPPJLNa) */

@charset "UTF-8";

/* =========================
   HUE ROTATION (dal tuo primo CSS)
   ========================= */
@property --hue {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}

:root{
  --hue: 0;
  --hue-speed: 1;       /* aumenta per più veloce */
  --anim-hue: 4s;       /* velocità rotazione colori */
  --c1: hsl(calc(var(--hue) * var(--hue-speed) * 1deg), 100%, 60%);
  --c2: hsl(calc((var(--hue) + 120) * var(--hue-speed) * 1deg), 100%, 60%);
  --c1a: hsla(calc(var(--hue) * var(--hue-speed) * 1deg), 100%, 60%, 0.6);
  --c2a: hsla(calc((var(--hue) + 120) * var(--hue-speed) * 1deg), 100%, 60%, 0.45);
}

@keyframes hue-animation {
  0% { --hue: 0; }
  100% { --hue: 360; }
}

/* =========================
   METADATA (originale)
   ========================= */
:root {
	--title: "Cyberspace Portal";
	--author: "Matt Cannon";
	--contact: "mc@mattcannon.design";
	--description: "An interactive card featuring a mesmerizing glow effect that invites you to enter a portal. Once activated, you are unexpectedly sucked into the matrix, traveling through a digital tunnel filled with floating code snippets and particles, immersing you in a journey through cyberspace.";
	--keywords: "card glow, portal, interactive card, box-shadow, 3D tunnel, Three.js, animation, CSS animation, JavaScript animation, particle effects, glowing effects, codepenchallenge, cpc-card-glow, immersive web experience";
	--last-modified: "2025-04-15";
	--content-language: "en";
	--generator: "HTML5, CSS3, JavaScript, Three.js, requestAnimationFrames,";
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

body {
	overflow: hidden;
	background: url("http://mattcannon.games/codepen/glow/background.png")
		no-repeat center center fixed;
	background-size: cover;
	background-color: #0a0a0a;
	font-family: "Unica One", sans-serif;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 100vh;
	position: relative;
	perspective: 2000px;
}

/* =========================
   LINK STYLE (tuo)
   ========================= */
a[href]{
  color: var(--text-secondary);
  text-decoration: none;
  position: relative;
  display: inline-block;
  transition:
    color var(--transition-fast),
    opacity var(--transition-fast),
    transform var(--transition-fast);
  opacity: 0.95;
  letter-spacing: 0.05em;
}

a[href]::after{
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 1px;
  background: var(--text-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-medium), opacity var(--transition-fast);
  opacity: 0.8;
  pointer-events: none;
}

a[href]:hover{
  color: var(--text-primary);
  transform: translateY(-1px);
  opacity: 1;
}

a[href]:hover::after{
  transform: scaleX(1);
}

a[href]:active{
  transform: translateY(0);
  opacity: 0.9;
}

a[href]:focus-visible{
  outline: none;
  box-shadow: 0 0 0 2px rgba(255,255,255,0.18);
  border-radius: 2px;
}

/* =========================
   PORTAL CARD
   ========================= */
#portalCard {
	position: absolute;
	width: 300px;
	height: 350px;
	background: rgba(10, 12, 18, 0.6);
	backdrop-filter: blur(10px);
	border-radius: 20px;

	/* prima: border 1px rgba(0,255,170,0.8) */
	border: 1px solid hsla(calc(var(--hue) * 1deg), 100%, 60%, 0.8);

	/* prima: shadow con #00ffaa/#00a3ff */
	box-shadow:
		0 0 30px var(--c1a),
		0 0 50px var(--c2a),
		inset 0 0 20px hsla(calc(var(--hue) * 1deg), 100%, 60%, 0.22);

	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	transition: all 2.2s cubic-bezier(0.1, 1, 0.1, 1);
	z-index: 10;
	overflow: hidden;
	transform-style: preserve-3d;
	position: relative;
	transform: scale(0.85);

	/* hue rotate */
	animation: hue-animation var(--anim-hue) linear infinite;
}

#portalCard::before {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: 19px;
	padding: 1px;

	/* prima: linear-gradient(135deg, #00ffaa, #00a3ff) */
	background: linear-gradient(135deg, var(--c1), var(--c2));

	-webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
	-webkit-mask-composite: xor;
	mask-composite: exclude;

	opacity: 0.9;
	transition: opacity 1.5s ease;
	z-index: 2;

	/* prima: box-shadow 0 0 20px rgba(0,255,170,1) */
	box-shadow: 0 0 20px var(--c1);

	animation: hue-animation var(--anim-hue) linear infinite;
}

#portalCard::after {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: 20px;

	/* prima: gradient rgba(0,255,170,0.15) -> rgba(0,179,255,0.15) */
	background: linear-gradient(
		135deg,
		hsla(calc(var(--hue) * 1deg), 100%, 60%, 0.15) 0%,
		hsla(calc((var(--hue) + 120) * 1deg), 100%, 60%, 0.15) 100%
	);

	opacity: 0.5;
	z-index: 1;

	animation: hue-animation var(--anim-hue) linear infinite;
}

/* =========================
   GOOEY EFFECT
   ========================= */
.gooey-effect {
	position: absolute;
	inset: 0;
	border-radius: 20px;
	overflow: hidden;
	z-index: 0;
	opacity: 0.9;
	filter: blur(2px);
}

.gooey-blob {
	position: absolute;
	border-radius: 50%;
	filter: blur(12px);
	animation: float-blob 15s infinite ease-in-out;
	opacity: 0.9;
}

/* Blob 1 */
.gooey-blob:nth-child(1) {
	width: 250px;
	height: 250px;
	left: -50px;
	top: 100px;

	background: radial-gradient(
		circle,
		hsla(calc(var(--hue) * 1deg), 100%, 60%, 0.75) 0%,
		transparent 70%
	);

	animation: float-blob 8s infinite ease-in-out, hue-animation var(--anim-hue) linear infinite;
}

/* Blob 2 */
.gooey-blob:nth-child(2) {
	width: 200px;
	height: 200px;
	right: -30px;
	top: 50px;

	background: radial-gradient(
		circle,
		hsla(calc((var(--hue) + 120) * 1deg), 100%, 60%, 0.75) 0%,
		transparent 70%
	);

	animation-duration: 8s;
	animation-delay: -3s;
	animation-name: float-blob, hue-animation;
	animation-timing-function: ease-in-out, linear;
	animation-iteration-count: infinite, infinite;
	animation-duration: 8s, var(--anim-hue);
}

/* Blob 3 */
.gooey-blob:nth-child(3) {
	width: 180px;
	height: 180px;
	right: 50px;
	bottom: 100px;

	background: radial-gradient(
		circle,
		hsla(calc(var(--hue) * 1deg), 100%, 60%, 0.75) 0%,
		transparent 70%
	);

	animation-duration: 10s;
	animation-delay: -4s;
	animation-name: float-blob, hue-animation;
	animation-timing-function: ease-in-out, linear;
	animation-iteration-count: infinite, infinite;
	animation-duration: 10s, var(--anim-hue);
}

/* Blob 4 */
.gooey-blob:nth-child(4) {
	width: 220px;
	height: 220px;
	left: 30px;
	bottom: 30px;

	background: radial-gradient(
		circle,
		hsla(calc((var(--hue) + 120) * 1deg), 100%, 60%, 0.75) 0%,
		transparent 70%
	);

	animation-duration: 10s;
	animation-delay: -4s;
	animation-name: float-blob, hue-animation;
	animation-timing-function: ease-in-out, linear;
	animation-iteration-count: infinite, infinite;
	animation-duration: 10s, var(--anim-hue);
}

@keyframes float-blob {
	0%,
	100% {
		transform: translate(0, 0) scale(1);
	}
	20% {
		transform: translate(30px, 20px) scale(1.05);
	}
	40% {
		transform: translate(20px, 40px) scale(0.95);
	}
	60% {
		transform: translate(-20px, 30px) scale(1.1);
	}
	80% {
		transform: translate(-30px, -20px) scale(0.9);
	}
}

/* =========================
   TEXT
   ========================= */
#portalCard:hover .cursor-blur {
	transform: scale(1);
	transition: transform 1s ease-out;
}

#portalCard h1 {
	color: white;
	font-weight: 300;
	font-size: 40px;
	margin-bottom: 20px;
	text-transform: uppercase;
	letter-spacing: 2px;
	transition: all 0.8s ease;
	text-shadow: 0 0 15px rgba(0, 255, 170, 0.7);
	position: relative;
	z-index: 5;
	line-height: 1;
	text-align: center;
}

/* =========================
   BUTTON
   ========================= */
#portalButton {
	padding: 16px 38px;
	background: rgba(10, 12, 20, 0.3);

	/* prima: border 2px solid #00ffaa */
	border: 2px solid var(--c1);

	border-radius: 50px;
	color: white;
	font-family: "Unica One", sans-serif;
	font-weight: 400;
	font-size: 22px;
	letter-spacing: 1px;
	cursor: pointer;
	transition: all 0.3s ease;
	position: relative;
	z-index: 20;
	backdrop-filter: blur(5px);
	overflow: hidden;

	/* prima: shadow rgba(0,255,170,0.5) */
	box-shadow: 0 0 10px var(--c1a);

	text-shadow: 0 0 5px rgba(0, 255, 255, 0.5);

	animation: hue-animation var(--anim-hue) linear infinite;
}

#portalButton::before {
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;

	background: linear-gradient(
		90deg,
		hsla(calc(var(--hue) * 1deg), 100%, 60%, 0.30),
		hsla(calc((var(--hue) + 120) * 1deg), 100%, 60%, 0.30)
	);

	opacity: 0;
	transition: opacity 0.3s ease;

	animation: hue-animation var(--anim-hue) linear infinite;
}

#portalButton:hover {
	transform: scale(1.05);
	box-shadow: 0 0 15px var(--c1a);
	text-shadow: 0 0 10px rgba(0, 255, 255, 0.8);

	/* prima: border-color #00ffdd */
	border-color: hsl(calc((var(--hue) + 40) * 1deg), 100%, 60%);
}

#portalButton:hover::before {
	opacity: 1;
}

/* =========================
   CANVAS + CONTENT
   ========================= */
#tunnelCanvas {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	clip-path: circle(10% at 50% 50%);
	transition: clip-path 1.8s ease-out;
}

#tunnelCanvas.active {
	clip-path: circle(150% at 50% 50%);
}

#portalContent {
	transition: all 1.1s ease;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	z-index: 5;
}

#tunnelContainer {
	position: absolute;
	top: 0;
	left: 0;
	width: 100vw;
	height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	z-index: 1;
	pointer-events: none;
	transform-style: preserve-3d;
	transition: all 0s;
}

#tunnelContainer.active {
	pointer-events: all;
	z-index: 15;
}

/* =========================
   ZOOM TRANSITION
   ========================= */
#portalCard.zoomIn {
	transform: translateZ(500px) scale(6);
	opacity: 0;
	transition: transform 2s ease-out, opacity 1.5s ease-in;
}

#portalCard.zoomIn::before,
#portalCard.zoomIn::after {
	opacity: 0;
}

#portalCard.zoomIn #portalContent {
	opacity: 0;
	transform: scale(0.5);
}

/* =========================
   PARTICLE BG CANVAS
   ========================= */
.card-bg {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	opacity: 0.1;
	pointer-events: none;
	z-index: -1;
}