making it mobile friendly

adding readme.md
Merge pull request 'feat/new-background' (#2 ) from feat/new-background into main
2026-10-11 16:48:40 -03:00 · 2026-09-09 22:28:18 -03:00 · 2026-07-30 00:22:38 +00:00 · 2026-07-21 20:52:16 -03:00 · 2026-07-21 20:52:08 -03:00 · 2026-07-13 22:49:52 -03:00
12 changed files with 735 additions and 96 deletions
@@ -11,7 +11,7 @@ env:
 jobs:
  build:
    name: Build Homepage Image
-    runs-on: ubuntu-amd64
+    runs-on: runner-slim-amd64
    outputs:
      short_sha: ${{ steps.vars.outputs.short_sha }}
    steps:
@@ -33,7 +33,7 @@ jobs:

  deploy:
    name: Deploy Homepage
-    runs-on: ubuntu-amd64
+    runs-on: runner-slim-amd64
    needs: build
    steps:
      - name: Check out repository
@@ -15,7 +15,7 @@ env:
 jobs:
  build:
    name: Build Homepage Image
-    runs-on: ubuntu-amd64
+    runs-on: runner-slim-amd64
    outputs:
      short_sha: ${{ steps.vars.outputs.short_sha }}
    steps:
@@ -39,7 +39,7 @@ jobs:

  deploy:
    name: Deploy Homepage
-    runs-on: ubuntu-amd64
+    runs-on: runner-slim-amd64
    needs: build
    steps:
      - name: Check out repository
@@ -3,7 +3,7 @@

 <head>
    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0, user-scalable=yes">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
    <meta name="description" content="The requested page could not be found.">
    <meta name="author" content="ivanch">

@@ -15,8 +15,8 @@
    <link rel="icon" href="/assets/favicon.ico" type="image/x-icon">

    <title>404 | ivanch</title>
-    <link rel="stylesheet" href="css/main.css">
-    <link rel="stylesheet" href="css/matrix.css">
+    <link rel="stylesheet" href="css/main.css?v=20261011-2">
+    <link rel="stylesheet" href="css/matrix.css?v=20261011-2">
    <link rel="stylesheet" href="css/button.css">
    <link rel="stylesheet" href="css/sections/error.css">

@@ -45,7 +45,7 @@
        </section>
    </main>

-    <script src="js/matrix.js"></script>
+    <script src="js/flowfield.js?v=20261011-2"></script>
 </body>

 </html>
@@ -0,0 +1,68 @@
+<h1 align="center">
+  Hey there, I'm José 👋
+</h1>
+
+<p align="center"> .NET Core | DevOps | Self-hosted Enthusiast </p>
+
+I design and automate resilient systems ensuring rapid delivery and rock‑solid reliability.
+Passionate about building robust code, streamlining CI/CD, orchestrating Kubernetes, and contributing to open-source.
+
+---
+
+<p align="center" style="margin-top: 25px;">
+  <img src="https://img.shields.io/badge/.NET_Core-512BD4?logo=.net&logoColor=white" alt=".NET Core"/>
+  <img src="https://img.shields.io/badge/React-20232A?logo=react&logoColor=61DAFB" alt="React"/>
+  <img src="https://img.shields.io/badge/Python-3776AB?logo=python&logoColor=white" alt="Python"/>
+  <img src="https://img.shields.io/badge/HTML5-E34F26?logo=html5&logoColor=white" alt="HTML5"/>
+  <img src="https://img.shields.io/badge/CSS3-1572B6?logo=css3&logoColor=white" alt="CSS3"/>
+  <br>
+  <img src="https://img.shields.io/badge/PostgreSQL-4169E1?logo=postgresql&logoColor=white" alt="PostgreSQL"/>
+  <img src="https://img.shields.io/badge/MySQL-4479A1?logo=mysql&logoColor=white" alt="MySQL"/>
+  <img src="https://img.shields.io/badge/Redis-DC382D?logo=redis&logoColor=white" alt="Redis"/>
+  <br>
+  <img src="https://img.shields.io/badge/Linux-FCC624?logo=linux&logoColor=black" alt="Linux"/>
+  <img src="https://img.shields.io/badge/Bash-4EAA25?logo=gnubash&logoColor=white" alt="Bash"/>
+  <img src="https://img.shields.io/badge/Docker-2496ED?logo=docker&logoColor=white" alt="Docker"/>
+  <img src="https://img.shields.io/badge/Kubernetes-326CE5?logo=kubernetes&logoColor=white" alt="Kubernetes"/>
+  <img src="https://img.shields.io/badge/Terraform-623CE4?logo=terraform&logoColor=white" alt="Terraform"/>
+  <img src="https://img.shields.io/badge/GitHub_Actions-2088FF?logo=github-actions&logoColor=white" alt="GitHub Actions"/>
+</p>
+
+---
+
+<h3 align="center"> 🚀 Featured Projects </h3>
+
+- 🔍 **[OpenCand](https://github.com/ivanch/opencand)** - [opencand.ivanch.me](https://opencand.ivanch.me)
+  Simple Brazilian candidate data viewer and searcher, made with .NET Core and React
+
+- 📃 **[Vision Start](https://github.com/ivanch/vision-start)**
+  A glassmorphism-looking like, modern and customizable Chrome startpage
+
+- ⚡️ **[Haven](https://github.com/ivanch/haven)** - *personal homelab*
+  Bare-metal Kubernetes cluster using k3s, some other Docker containers, and some sorcery
+
+- 🎶 **[Kasbot](https://github.com/ivanch/kasbot)**
+  Discord bot inspired by a Brazilian DJ
+
+<!--
+---
+
+<h3 align="center"> 🌐 Contacts and socials </h3>
+
+<p align="center">
+    <a href="https://www.linkedin.com/in/joseivanch/">
+        <img src="https://img.shields.io/badge/LinkedIn-0A66C2?logo=linkedin&logoColor=white" alt="LinkedIn"/>
+    </a>
+    <a href="https://last.fm/user/ivanch">
+        <img src="https://img.shields.io/badge/Last.fm-D51007?logo=lastdotfm&logoColor=white" alt="Last.fm"/>
+    </a>
+    <a href="https://git.ivanch.me/ivanch">
+        <img src="https://img.shields.io/badge/Gitea-007300?logo=gitea&logoColor=white" alt="Gitea"/>
+    </a>
+    <a href="mailto:jose.henrique.ivan@gmail.com">
+        <img src="https://img.shields.io/badge/Email-333333?logo=gmail&logoColor=white" alt="Email"/>
+    </a>
+    <a href="https://blog.ivanch.me/">
+        <img src="https://img.shields.io/badge/Blog-9aa500?logo=blogger&logoColor=white" alt="Blog"/>
+    </a>
+</p> -->
@@ -16,7 +16,6 @@ body {
    font-family: var(--font-family);
    background: var(--background-color);
    min-height: 100vh;
-    overflow-x: hidden;
    position: relative;
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
@@ -65,13 +64,15 @@ img {
 }

 .main-container {
-    position: absolute;
-    top: 50%;
-    left: 50%;
-    transform: translate(-50%, -50%);
+    --page-gutter: var(--space-lg);
+    --page-top: var(--space-xl);
+    position: relative;
+    margin: 0 auto;
    max-width: 1200px;
    width: 100%;
-    padding: 0 var(--space-lg);
+    min-height: 100vh;
+    min-height: 100svh;
+    padding: var(--page-top) var(--page-gutter) var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
@@ -114,8 +115,8 @@ img {
    padding: var(--space-2xl) var(--space-xl);
    transition: background var(--dur-med) var(--ease-out-soft),
                box-shadow var(--dur-med) var(--ease-out-soft);
-    min-width: 26rem;
-    max-width: 26rem;
+    min-width: 0;
+    width: 100%;
 }

 /* ------------------------------------------------------------------ */
@@ -158,45 +159,36 @@ img {

 /* ------------------------------------------------------------------ */
 /* Mobile responsive layout                                            */
-/* Single breakpoint switches the centered card to a stacked column.  */
-/* Width constraints (set via tokens in section CSS) are overridden   */
-/* in one place here rather than repeated across multiple sections.   */
+/* Keep the page in normal flow so short screens can scroll fully.    */
 /* ------------------------------------------------------------------ */
@media (max-width: 1024px) {
    .main-container {
-        position: relative;
-        top: auto;
-        left: auto;
-        transform: none;
-        padding: var(--space-xl) var(--space-md);
-        min-height: 100vh;
-        display: flex;
+        --page-gutter: var(--space-md);
        align-items: flex-start;
    }

-    .content,
-    .homelab-section,
-    .projects-section {
-        min-width: unset;
-        max-width: unset;
-        width: 100%;
-    }
-
    .content {
        padding: var(--space-xl) var(--space-lg);
    }
 }

@media (max-width: 480px) {
-    body {
-        font-size: 14px;
-    }
-
    .main-container {
-        padding: var(--space-xl) var(--space-sm);
+        --page-gutter: var(--space-xs);
+        --page-top: var(--space-md);
    }

    .content {
        padding: var(--space-lg) var(--space-md);
    }
 }
+
+/* Leave room for notches and the home indicator in landscape, too. */
+@supports (padding: max(0px, env(safe-area-inset-left))) {
+    .main-container {
+        padding-top: max(var(--page-top), env(safe-area-inset-top));
+        padding-left: max(var(--page-gutter), env(safe-area-inset-left));
+        padding-right: max(var(--page-gutter), env(safe-area-inset-right));
+        padding-bottom: max(var(--space-xl), env(safe-area-inset-bottom));
+    }
+}
@@ -14,8 +14,36 @@
    filter: brightness(0.7) saturate(1.05);
 }

-@media (prefers-reduced-motion: reduce) {
-    .matrix-canvas {
-        filter: brightness(0.6) saturate(0.9);
+/* CSS only on phones/tablets and for reduced motion: no canvas work. */
+/* Keep this query in sync with js/flowfield.js. */
+@media (max-width: 1024px), (pointer: coarse), (prefers-reduced-motion: reduce) {
+    body {
+        background:
+            radial-gradient(ellipse at 0% 0%, rgba(79, 195, 247, 0.18), transparent 55%),
+            radial-gradient(ellipse at 100% 65%, rgba(118, 75, 162, 0.22), transparent 60%),
+            linear-gradient(150deg, #0b1220, #100c1c);
+    }
+
+    .matrix-canvas,
+    .avatar .glitch-layer {
+        display: none;
+    }
+
+    .main-container .glass,
+    .avatar::after,
+    .homelab-background,
+    .homelab-background::after,
+    .homelab-title {
+        animation: none;
+    }
+
+    .main-container .glass {
+        will-change: auto;
+    }
+
+    /* Avoid blur compositing work while scrolling. */
+    body .main-container :is(.glass, .content, .projects-section, .homelab-section, .btn) {
+        backdrop-filter: none;
+        -webkit-backdrop-filter: none;
    }
 }
@@ -5,17 +5,18 @@
    padding: var(--space-2xl);
    width: 100%;
    display: grid;
-    grid-template-columns: 200px 1fr;
+    grid-template-columns: 180px minmax(0, 1fr);
    gap: var(--space-xl);
    align-items: center;
    animation: fadeInUp 0.8s var(--ease-out-expo);
 }

 .hero-details {
-    display: flex;
-    flex-direction: row;
+    display: grid;
+    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: var(--space-sm);
-    align-items: flex-start;
+    align-items: stretch;
+    min-width: 0;
    width: 100%;
    justify-content: flex-start;
 }
@@ -153,7 +154,6 @@
 /* ------------------------------------------------------------------ */
@media (max-width: 1024px) {
    .hero-details {
-        flex-direction: column;
        gap: var(--space-xl);
    }

@@ -166,6 +166,10 @@
        width: 100%;
        align-items: stretch;
    }
+
+    .tech-tags {
+        justify-content: center;
+    }
 }

@media (max-width: 768px) {
@@ -176,8 +180,13 @@
        text-align: center;
    }

+    .hero-details {
+        grid-template-columns: minmax(0, 1fr);
+        gap: var(--space-lg);
+    }
+
    .name {
-        font-size: var(--text-xl);
+        font-size: var(--text-2xl);
    }

    .social-links {
@@ -191,35 +200,24 @@
        padding: var(--space-lg) var(--space-md);
    }

-    .name {
-        font-size: var(--text-lg);
-    }
-
    .social-links {
-        gap: var(--space-xs);
+        display: grid;
+        grid-template-columns: repeat(2, minmax(0, 1fr));
+        gap: var(--space-sm);
    }

    .social-link {
        padding: var(--space-sm) var(--space-md);
-        font-size: var(--text-xs);
+        font-size: var(--text-sm);
        min-width: 0;
-        flex: 1;
-        max-width: calc(50% - 6px);
        justify-content: center;
    }

-    .social-link span {
-        display: none;
+    .social-link:last-child {
+        grid-column: 1 / -1;
    }

    .social-link i {
        font-size: 16px;
    }
 }
-
-@media (max-width: 380px) {
-    .social-link {
-        max-width: calc(100% / 2 - 6px);
-        padding: var(--space-sm);
-    }
-}
@@ -1,5 +1,4 @@
 .homelab-section {
-    margin-top: var(--space-md);
    padding: var(--space-xl) var(--space-lg);
    background: rgba(20, 20, 30, 0.10);
    backdrop-filter: blur(48px);
@@ -7,8 +6,8 @@
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-md), var(--inset-shadow);
    border: 1px solid var(--glass-border);
-    min-width: 26rem;
-    max-width: 26rem;
+    min-width: 0;
+    width: 100%;
    align-self: stretch;
    display: flex;
    flex-direction: column;
@@ -220,12 +219,11 @@
    .homelab-buttons {
        gap: var(--space-sm);
        flex-direction: column;
-        align-items: center;
+        align-items: stretch;
    }

    .homelab-btn {
        width: 100%;
-        max-width: 200px;
        justify-content: center;
    }
 }
@@ -262,6 +262,26 @@
 /* ------------------------------------------------------------------ */
 /* Responsive                                                          */
 /* ------------------------------------------------------------------ */
+@media (min-width: 769px) and (max-width: 1024px) {
+    .profile-container {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: var(--space-xl);
+    }
+
+    .profile-container .profile-info {
+        margin-top: 0;
+        align-items: flex-start;
+        text-align: left;
+    }
+
+    .profile-container .avatar {
+        margin: 0;
+        flex-shrink: 0;
+    }
+}
+
@media (max-width: 1024px) {
    .profile-info {
        align-items: center;
@@ -304,7 +324,7 @@
    }

    .profile-info-item {
-        font-size: var(--text-xs);
+        font-size: var(--text-sm);
        flex-direction: row;
        gap: var(--space-xs);
    }
@@ -327,6 +347,6 @@
    }

    .profile-info-item {
-        font-size: var(--text-xs);
+        font-size: var(--text-sm);
    }
 }
@@ -1,5 +1,4 @@
 .projects-section {
-    flex: 0 0 340px;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
@@ -10,8 +9,8 @@
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-md), var(--inset-shadow);
    border-bottom: 1px solid var(--glass-border);
-    min-width: 380px;
-    max-width: 440px;
+    min-width: 0;
+    width: 100%;
    align-self: stretch;
 }

@@ -112,13 +111,11 @@
    flex-wrap: nowrap;
 }

-/* Keep long titles from pushing icons to a new line */
+/* Let titles wrap while keeping the action links available. */
 .project-title > span:first-child {
    flex: 1 1 auto;
    min-width: 0;
-    overflow: hidden;
-    text-overflow: ellipsis;
-    white-space: nowrap;
+    overflow-wrap: anywhere;
 }

 .project-icon-link {
@@ -150,12 +147,16 @@
 /* Responsive                                                          */
 /* ------------------------------------------------------------------ */
@media (max-width: 1024px) {
-    .projects-section {
-        flex: unset;
-        max-width: 100%;
-        margin-left: 0;
-        margin-top: var(--space-xl);
-        min-width: unset;
+    .project-icon-link {
+        width: 44px;
+        height: 44px;
+    }
+}
+
+@media (pointer: coarse) {
+    .project-icon-link {
+        width: 44px;
+        height: 44px;
    }
 }

@@ -179,7 +180,7 @@
    }

    .projects-title {
-        font-size: var(--text-sm);
+        font-size: var(--text-md);
    }

    .project {
@@ -191,7 +192,7 @@
    }

    .project-desc {
-        font-size: var(--text-xs);
+        font-size: var(--text-sm);
    }

    .project-icons {
@@ -205,7 +206,7 @@
    }

    .project-title {
-        font-size: var(--text-xs);
+        font-size: var(--text-sm);
        flex-direction: row;
        align-items: center;
        gap: var(--space-xs);
@@ -2,7 +2,7 @@
 <html lang="en">
 <head>
    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0, user-scalable=yes">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
    <meta name="description" content="ivanch's personal portfolio showcasing projects and homelab setup.">
    <meta name="author" content="ivanch">
    
@@ -14,14 +14,14 @@
    <link rel="icon" href="/assets/favicon.ico" type="image/x-icon">

    <title>ivanch</title>
-    <link rel="stylesheet" href="css/main.css">
+    <link rel="stylesheet" href="css/main.css?v=20261011-2">

-    <link rel="stylesheet" href="css/sections/profile.css">
-    <link rel="stylesheet" href="css/sections/homelab.css">
-    <link rel="stylesheet" href="css/sections/projects.css">
-    <link rel="stylesheet" href="css/sections/hero.css">
+    <link rel="stylesheet" href="css/sections/profile.css?v=20261011-2">
+    <link rel="stylesheet" href="css/sections/homelab.css?v=20261011-2">
+    <link rel="stylesheet" href="css/sections/projects.css?v=20261011-2">
+    <link rel="stylesheet" href="css/sections/hero.css?v=20261011-2">

-    <link rel="stylesheet" href="css/matrix.css">
+    <link rel="stylesheet" href="css/matrix.css?v=20261011-2">
    <link rel="stylesheet" href="css/button.css">
    
    <!-- Remix Icon CDN for social icons -->
@@ -149,7 +149,7 @@
        </div>
    </main>

-    <script src="js/matrix.js"></script>
+    <script src="js/flowfield.js?v=20261011-2"></script>
    <script src="js/social.js"></script>
 </body>
 </html>
@@ -0,0 +1,534 @@
+/**
+ * FlowFieldBackground
+ *
+ * Minimal generative backdrop: hundreds of hair-thin particles ride a
+ * domain-warped simplex flow field and leave short silk-like trails.
+ * The cursor bends the current into a slow vortex (nearby strokes pick up
+ * a faint glow); clicking / tapping emits a thin ripple that shoves
+ * particles aside.
+ *
+ * Trails are drawn by erasing the previous frame with a low-alpha
+ * `destination-out` pass, so the CSS gradient painted behind the canvas
+ * element keeps showing through instead of being flooded by an opaque fill.
+ */
+
+/* Deterministic PRNG so the noise permutation is stable within a page load. */
+function mulberry32(seed) {
+    return function () {
+        seed |= 0;
+        seed = (seed + 0x6D2B79F5) | 0;
+        let t = Math.imul(seed ^ (seed >>> 15), 1 | seed);
+        t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
+        return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
+    };
+}
+
+/* Compact seeded 2D simplex noise (Gustavson-style), output in ~[-1, 1]. */
+class SimplexNoise {
+    constructor(seed) {
+        const rand = mulberry32(seed);
+        const p = new Uint8Array(256);
+        for (let i = 0; i < 256; i++) p[i] = i;
+        // Fisher-Yates shuffle for the permutation table.
+        for (let i = 255; i > 0; i--) {
+            const j = (rand() * (i + 1)) | 0;
+            const tmp = p[i];
+            p[i] = p[j];
+            p[j] = tmp;
+        }
+        this.perm = new Uint8Array(512);
+        this.permMod12 = new Uint8Array(512);
+        for (let i = 0; i < 512; i++) {
+            this.perm[i] = p[i & 255];
+            this.permMod12[i] = this.perm[i] % 12;
+        }
+    }
+
+    noise2D(xin, yin) {
+        const F2 = SimplexNoise.F2;
+        const G2 = SimplexNoise.G2;
+        const GRAD3 = SimplexNoise.GRAD3;
+        let n0 = 0, n1 = 0, n2 = 0;
+
+        const s = (xin + yin) * F2;
+        const i = Math.floor(xin + s);
+        const j = Math.floor(yin + s);
+        const t = (i + j) * G2;
+
+        const x0 = xin - (i - t);
+        const y0 = yin - (j - t);
+
+        // Corner offsets depend on which half of the simplex we landed in.
+        let i1, j1;
+        if (x0 > y0) { i1 = 1; j1 = 0; } else { i1 = 0; j1 = 1; }
+
+        const x1 = x0 - i1 + G2;
+        const y1 = y0 - j1 + G2;
+        const x2 = x0 - 1 + 2 * G2;
+        const y2 = y0 - 1 + 2 * G2;
+
+        const ii = i & 255;
+        const jj = j & 255;
+
+        let t0 = 0.5 - x0 * x0 - y0 * y0;
+        if (t0 >= 0) {
+            const g = GRAD3[this.permMod12[ii + this.perm[jj]]];
+            t0 *= t0;
+            n0 = t0 * t0 * (g[0] * x0 + g[1] * y0);
+        }
+
+        let t1 = 0.5 - x1 * x1 - y1 * y1;
+        if (t1 >= 0) {
+            const g = GRAD3[this.permMod12[ii + i1 + this.perm[jj + j1]]];
+            t1 *= t1;
+            n1 = t1 * t1 * (g[0] * x1 + g[1] * y1);
+        }
+
+        let t2 = 0.5 - x2 * x2 - y2 * y2;
+        if (t2 >= 0) {
+            const g = GRAD3[this.permMod12[ii + 1 + this.perm[jj + 1]]];
+            t2 *= t2;
+            n2 = t2 * t2 * (g[0] * x2 + g[1] * y2);
+        }
+
+        // Empirical factor scaling the sum into roughly [-1, 1].
+        return 70 * (n0 + n1 + n2);
+    }
+}
+
+SimplexNoise.F2 = 0.5 * (Math.sqrt(3) - 1);
+SimplexNoise.G2 = (3 - Math.sqrt(3)) / 6;
+SimplexNoise.GRAD3 = [
+    [1, 1], [-1, 1], [1, -1], [-1, -1],
+    [1, 0], [-1, 0], [1, 0], [-1, 0],
+    [0, 1], [0, -1], [0, 1], [0, -1]
+];
+
+class FlowFieldBackground {
+    constructor() {
+        // Legacy element id kept from the previous background; the canvas
+        // and its CSS (css/matrix.css) are reused on purpose.
+        this.canvas = document.getElementById('matrixCanvas');
+        this.ctx = this.canvas.getContext('2d');
+        this.noise = new SimplexNoise((Math.random() * 0xffffffff) | 0);
+
+        this.particles = [];
+        this.sparks = [];
+        this.mouse = { x: 0, y: 0, active: false };
+        this.rafId = null;
+        this.resizeRaf = null;
+        this.events = new AbortController();
+
+        this.width = 0;
+        this.height = 0;
+        this.dpr = 1;
+
+        // Random phase so each visit opens on a different current.
+        this.time = Math.random() * 4000;
+
+        this.config = {
+            baseSpeed: 0.75,
+            maxSpeed: 2.8,       // velocity cap so streaks remain calm
+            steer: 0.055,        // how fast particles align with the field
+            fieldScale: 0.0015,  // noise zoom: small value = large, calm features
+            warpStrength: 160,   // px of domain warp, keeps the flow organic
+            winding: 2.4,        // field angle range multiplier (x PI)
+            timeDrift: 0.00028,  // slow evolution of the whole field
+            fadeAlpha: 0.038,    // trail persistence (lower = longer trails)
+            mouseRadius: 180,
+            mouseSwirl: 0.5,     // tangential push around the cursor
+            mousePull: 0.06,     // whisper of inward pull -> orbiting feel
+            glowBoost: 0.25,     // extra alpha for particles near the cursor
+            sparkCount: 10,      // subtle micro-sparks per click
+            life: { min: 280, max: 920 } // frames before a particle respawns
+        };
+
+        // Rich site palette with cyan, indigo, violet, and soft luminous accents
+        this.palette = [
+            { weight: 0.55, rgb: '206, 224, 255', alpha: 0.13 }, // Soft cyan-white
+            { weight: 0.18, rgb: '79, 195, 247', alpha: 0.24 }, // Electric cyan
+            { weight: 0.14, rgb: '102, 126, 234', alpha: 0.16 }, // Deep indigo
+            { weight: 0.13, rgb: '146, 103, 197', alpha: 0.16 }  // Soft violet
+        ];
+
+        this.init();
+    }
+
+    init() {
+        this.bindEvents();
+        this.handleResize();
+
+        // Pre-run a short exposure so the first paint is already textured.
+        this.warmup(60);
+        this.animate();
+    }
+
+    bindEvents() {
+        const signal = this.events.signal;
+        // The canvas has pointer-events: none, so listen on window.
+        window.addEventListener('pointermove', (e) => {
+            this.mouse.x = e.clientX;
+            this.mouse.y = e.clientY;
+            this.mouse.active = true;
+        }, { passive: true, signal });
+
+        window.addEventListener('pointerdown', (e) => {
+            this.spawnClickBurst(e.clientX, e.clientY);
+        }, { passive: true, signal });
+
+        window.addEventListener('pointerout', () => {
+            this.mouse.active = false;
+        }, { signal });
+
+        // Pause the rAF loop when the tab is hidden to save CPU / battery.
+        document.addEventListener('visibilitychange', () => {
+            if (document.hidden) {
+                this.stop();
+            } else {
+                this.start();
+            }
+        }, { signal });
+
+        window.addEventListener('resize', () => {
+            if (this.resizeRaf) cancelAnimationFrame(this.resizeRaf);
+            this.resizeRaf = requestAnimationFrame(() => {
+                this.resizeRaf = null;
+                this.handleResize();
+            });
+        }, { signal });
+    }
+
+    start() {
+        if (this.rafId) return;
+        this.animate();
+    }
+
+    stop() {
+        if (this.rafId) {
+            cancelAnimationFrame(this.rafId);
+            this.rafId = null;
+        }
+    }
+
+    destroy() {
+        this.stop();
+        this.events.abort();
+        if (this.resizeRaf) cancelAnimationFrame(this.resizeRaf);
+        this.particles = [];
+        this.sparks = [];
+        // Release the high-DPI drawing buffer when switching to CSS only.
+        this.canvas.width = 1;
+        this.canvas.height = 1;
+    }
+
+    handleResize() {
+        const w = window.innerWidth;
+        const h = window.innerHeight;
+
+        // Mobile browsers fire resize on scroll when the URL bar collapses;
+        // only react to real geometry changes to avoid canvas flicker.
+        if (this.width && w === this.width && Math.abs(h - this.height) < 150) return;
+
+        this.width = w;
+        this.height = h;
+        this.dpr = Math.min(window.devicePixelRatio || 1, 2);
+        this.canvas.width = Math.round(w * this.dpr);
+        this.canvas.height = Math.round(h * this.dpr);
+        this.ctx.setTransform(this.dpr, 0, 0, this.dpr, 0, 0);
+
+        // Density scales with area, clamped for both phones and ultrawides.
+        const count = Math.round(Math.min(Math.max((w * h) / 2600, 160), 650));
+        this.particles = [];
+        for (let i = 0; i < count; i++) {
+            this.particles.push(this.createParticle());
+        }
+
+        // Repaint a short exposure so a resize never flashes an empty canvas.
+        this.warmup(30);
+    }
+
+    pickTone() {
+        let roll = Math.random();
+        for (const tone of this.palette) {
+            roll -= tone.weight;
+            if (roll <= 0) return tone;
+        }
+        return this.palette[0];
+    }
+
+    createParticle() {
+        const tone = this.pickTone();
+        const { min, max } = this.config.life;
+
+        // 3 Depth layers: 0 (background ambient), 1 (main stream), 2 (foreground highlight)
+        const randDepth = Math.random();
+        let depth = 1;
+        let speedMult = 1.0;
+        let widthMult = 1.0;
+        let alphaMult = 1.0;
+
+        if (randDepth < 0.25) {
+            depth = 0;
+            speedMult = 0.65;
+            widthMult = 0.6;
+            alphaMult = 0.65;
+        } else if (randDepth > 0.78) {
+            depth = 2;
+            speedMult = 1.35;
+            widthMult = 1.35;
+            alphaMult = 1.25;
+        }
+
+        return {
+            depth,
+            x: Math.random() * this.width,
+            y: Math.random() * this.height,
+            px: 0,
+            py: 0,
+            vx: 0,
+            vy: 0,
+            speed: this.config.baseSpeed * speedMult * (0.75 + Math.random() * 0.5),
+            width: (0.7 + Math.random() * 0.5) * widthMult,
+            rgb: tone.rgb,
+            baseAlpha: tone.alpha * (0.75 + Math.random() * 0.5) * alphaMult,
+            alpha: 0,
+            glow: 0,
+            life: Math.floor(Math.random() * (min * 0.5)),
+            maxLife: min + Math.random() * (max - min),
+            fresh: true // no previous point yet -> nothing to draw
+        };
+    }
+
+    respawn(p) {
+        p.x = Math.random() * this.width;
+        p.y = Math.random() * this.height;
+        p.vx = 0;
+        p.vy = 0;
+        p.life = 0;
+        p.fresh = true;
+    }
+
+    spawnClickBurst(x, y) {
+        // Emit a subtle, delicate burst of hair-thin micro-sparks on click
+        const count = this.config.sparkCount;
+        for (let i = 0; i < count; i++) {
+            const angle = Math.random() * Math.PI * 2;
+            const speed = 1.0 + Math.random() * 2.2;
+            const tone = this.pickTone();
+            this.sparks.push({
+                x,
+                y,
+                px: x,
+                py: y,
+                vx: Math.cos(angle) * speed,
+                vy: Math.sin(angle) * speed,
+                rgb: tone.rgb,
+                size: 0.6 + Math.random() * 0.8,
+                alpha: 0.6 + Math.random() * 0.25,
+                life: 0,
+                maxLife: 25 + Math.random() * 25
+            });
+        }
+    }
+
+    updateParticles() {
+        const { fieldScale, warpStrength, winding, steer, maxSpeed } = this.config;
+        const t = this.time;
+        const m = this.mouse;
+        const radius = this.config.mouseRadius;
+        const radiusSq = radius * radius;
+
+        const fadeIn = 35;
+        const fadeOut = 55;
+
+        for (const p of this.particles) {
+            // Smooth life envelope (fade-in on spawn, fade-out near maxLife)
+            let lifeEnvelope = 1;
+            if (p.life < fadeIn) {
+                lifeEnvelope = p.life / fadeIn;
+            } else if (p.life > p.maxLife - fadeOut) {
+                lifeEnvelope = Math.max(0, (p.maxLife - p.life) / fadeOut);
+            }
+            p.alpha = p.baseAlpha * lifeEnvelope;
+
+            // Domain-warped flow angle: the warp layer bends the main field
+            // so the current curls organically instead of drifting straight.
+            const warp = this.noise.noise2D(
+                p.x * fieldScale * 0.4 + t * 0.5,
+                p.y * fieldScale * 0.4 - t * 0.3
+            );
+            const angle = this.noise.noise2D(
+                (p.x + warp * warpStrength) * fieldScale + t,
+                (p.y - warp * warpStrength) * fieldScale - t * 0.7
+            ) * Math.PI * winding;
+
+            p.vx += (Math.cos(angle) * p.speed - p.vx) * steer;
+            p.vy += (Math.sin(angle) * p.speed - p.vy) * steer;
+
+            // Cursor vortex: tangential swirl + slight inward pull.
+            let proximity = 0;
+            if (m.active) {
+                const dx = p.x - m.x;
+                const dy = p.y - m.y;
+                const distSq = dx * dx + dy * dy;
+                if (distSq < radiusSq && distSq > 0.5) {
+                    const dist = Math.sqrt(distSq);
+                    proximity = 1 - dist / radius;
+                    const falloff = proximity * proximity;
+                    p.vx += (-dy / dist) * falloff * this.config.mouseSwirl
+                        + (-dx / dist) * falloff * this.config.mousePull;
+                    p.vy += (dx / dist) * falloff * this.config.mouseSwirl
+                        + (-dy / dist) * falloff * this.config.mousePull;
+                }
+            }
+            // Smooth the glow so the highlight eases in and out.
+            p.glow += (proximity - p.glow) * 0.12;
+
+            const speedSq = p.vx * p.vx + p.vy * p.vy;
+            if (speedSq > maxSpeed * maxSpeed) {
+                const scale = maxSpeed / Math.sqrt(speedSq);
+                p.vx *= scale;
+                p.vy *= scale;
+            }
+
+            p.px = p.x;
+            p.py = p.y;
+            p.x += p.vx;
+            p.y += p.vy;
+
+            // Wrap at the edges; mark fresh so no cross-screen streak is drawn.
+            if (p.x < 0 || p.x > this.width || p.y < 0 || p.y > this.height) {
+                p.x = (p.x + this.width) % this.width;
+                p.y = (p.y + this.height) % this.height;
+                p.fresh = true;
+            }
+
+            if (++p.life > p.maxLife) {
+                this.respawn(p);
+            }
+        }
+    }
+
+    updateSparks() {
+        const drag = 0.91;
+        const { fieldScale } = this.config;
+        const t = this.time;
+        for (let i = this.sparks.length - 1; i >= 0; i--) {
+            const s = this.sparks[i];
+            s.px = s.x;
+            s.py = s.y;
+
+            // Gently blend spark velocity with noise field as it slows down
+            const angle = this.noise.noise2D(s.x * fieldScale + t, s.y * fieldScale - t) * Math.PI * 2;
+            s.vx = s.vx * drag + Math.cos(angle) * 0.15;
+            s.vy = s.vy * drag + Math.sin(angle) * 0.15;
+
+            s.x += s.vx;
+            s.y += s.vy;
+            s.life++;
+
+            if (s.life >= s.maxLife) {
+                this.sparks.splice(i, 1);
+            }
+        }
+    }
+
+    fade() {
+        // Erase a fraction of the previous frame towards transparency so
+        // the CSS backdrop behind the canvas keeps showing through.
+        this.ctx.globalCompositeOperation = 'destination-out';
+        this.ctx.fillStyle = `rgba(0, 0, 0, ${this.config.fadeAlpha})`;
+        this.ctx.fillRect(0, 0, this.width, this.height);
+    }
+
+    drawParticles() {
+        const ctx = this.ctx;
+        // Additive blending gives a soft glow where currents overlap.
+        ctx.globalCompositeOperation = 'lighter';
+        ctx.lineCap = 'round';
+
+        for (const p of this.particles) {
+            if (p.fresh) {
+                p.fresh = false;
+                continue;
+            }
+            const alpha = Math.min(1, p.alpha + p.glow * this.config.glowBoost);
+            if (alpha <= 0.005) continue;
+
+            ctx.strokeStyle = `rgba(${p.rgb}, ${alpha.toFixed(3)})`;
+            ctx.lineWidth = p.width;
+            ctx.beginPath();
+            ctx.moveTo(p.px, p.py);
+            ctx.lineTo(p.x, p.y);
+            ctx.stroke();
+
+            // Draw a subtle bright dot at the head of foreground particles
+            if (p.depth === 2 && (p.glow > 0.1 || Math.random() < 0.12)) {
+                ctx.fillStyle = `rgba(240, 248, 255, ${(alpha * 0.75).toFixed(3)})`;
+                ctx.beginPath();
+                ctx.arc(p.x, p.y, p.width * 0.75, 0, Math.PI * 2);
+                ctx.fill();
+            }
+        }
+    }
+
+    drawSparks() {
+        if (!this.sparks.length) return;
+        const ctx = this.ctx;
+        ctx.globalCompositeOperation = 'lighter';
+
+        for (const s of this.sparks) {
+            const lifeRatio = 1 - s.life / s.maxLife;
+            const alpha = (s.alpha * lifeRatio * lifeRatio).toFixed(3);
+            if (alpha <= 0) continue;
+
+            ctx.strokeStyle = `rgba(${s.rgb}, ${alpha})`;
+            ctx.lineWidth = s.size * lifeRatio;
+            ctx.beginPath();
+            ctx.moveTo(s.px, s.py);
+            ctx.lineTo(s.x, s.y);
+            ctx.stroke();
+        }
+    }
+
+    step(withFade) {
+        if (withFade) this.fade();
+        this.updateSparks();
+        this.updateParticles();
+        this.drawParticles();
+        this.drawSparks();
+        this.time += this.config.timeDrift;
+    }
+
+    warmup(steps) {
+        for (let i = 0; i < steps; i++) {
+            this.step(false);
+        }
+    }
+
+    animate() {
+        this.step(true);
+        this.rafId = requestAnimationFrame(() => this.animate());
+    }
+}
+
+document.addEventListener('DOMContentLoaded', () => {
+    // Keep this query in sync with the static backdrop in css/matrix.css.
+    const staticBackground = window.matchMedia(
+        '(max-width: 1024px), (pointer: coarse), (prefers-reduced-motion: reduce)'
+    );
+    let background = null;
+
+    function updateBackground() {
+        if (staticBackground.matches) {
+            if (background) background.destroy();
+            background = null;
+        } else if (!background) {
+            background = new FlowFieldBackground();
+            if (document.hidden) background.stop();
+        }
+    }
+
+    staticBackground.addEventListener('change', updateBackground);
+    updateBackground();
+});
Author	SHA1	Message	Date
ivanch	e205172fce	making it mobile friendly Homepage Build and Deploy (Test) / Build Homepage Image (push) Successful in 42s Details Homepage Build and Deploy (Test) / Deploy Homepage (push) Successful in 5s Details	2026-10-11 16:48:40 -03:00
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ivanch	376a9aa5e4	Merge pull request 'feat/new-background' (#2 ) from feat/new-background into main Homepage Build and Deploy (Test) / Build Homepage Image (push) Successful in 14s Details Homepage Build and Deploy (Test) / Deploy Homepage (push) Successful in 3s Details Reviewed-on: #2	2026-07-30 00:22:38 +00:00
ivanch	269b306b87	adjustments Homepage Build and Deploy (Test) / Build Homepage Image (pull_request) Successful in 1m27s Details Homepage Build and Deploy (Test) / Deploy Homepage (pull_request) Successful in 10s Details	2026-07-21 20:52:16 -03:00
ivanch	632b807437	new background	2026-07-21 20:52:08 -03:00
ivanch	b330959cc5	ci: switch workflows to runner-slim-amd64 (new pipeline runner label) Homepage Build and Deploy (Test) / Build Homepage Image (push) Successful in 31s Details Homepage Build and Deploy (Test) / Deploy Homepage (push) Successful in 9s Details	2026-07-13 22:49:52 -03:00