Source: 04-UI-Glow

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<!DOCTYPE html>
<html lang="vi">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>04 — UI Glow</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <main class="wrap">
      <h1>Button Glow</h1>
      <p class="sub">Hiệu ứng nút phát sáng + ripple</p>

      <div class="btns">
        <button class="btn-glow" data-variant="primary">Mua ngay</button>
        <button class="btn-glow" data-variant="success">Dùng thử</button>
        <button class="btn-glow" data-variant="warning">Tìm hiểu</button>
      </div>
    </main>

    <script src="script.js"></script>
  </body>
</html>

:root {
  --bg: #0b1020;
  --card: #0f1a30;
  --txt: #e8ecf8;
  --primary: #6ea8fe;
  --success: #6edea8;
  --warning: #ffd36e;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: radial-gradient(
    60% 60% at 50% 0%,
    #121a35 0%,
    #090e1b 60%,
    #05070d 100%
  );
  color: var(--txt);
  font: 500 16px/1.5 ui-sans-serif, system-ui;
}
.wrap {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
}
h1 {
  margin: 0 0 6px;
  font-size: 42px;
  letter-spacing: 0.5px;
}
.sub {
  margin: 0 0 28px;
  opacity: 0.7;
}
.btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-glow {
  --c: var(--primary);
  position: relative;
  padding: 12px 20px;
  border-radius: 14px;
  border: 0;
  color: #0a0f1f;
  background: linear-gradient(#fff, #eee);
  font-weight: 700;
  cursor: pointer;
  isolation: isolate;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
}
.btn-glow[data-variant="success"] {
  --c: var(--success);
}
.btn-glow[data-variant="warning"] {
  --c: var(--warning);
}

.btn-glow::before {
  content: "";
  position: absolute;
  inset: -2px;
  z-index: -1;
  border-radius: 16px;
  background: radial-gradient(60% 100% at 50% 0%, var(--c) 0%, transparent 70%);
  filter: blur(12px);
  opacity: 0.65;
  transition: opacity 0.2s ease;
}
.btn-glow:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
}
.btn-glow:active {
  transform: translateY(0);
}

.ripple {
  position: absolute;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  background: radial-gradient(circle, var(--c), transparent 60%);
  width: 12px;
  height: 12px;
  animation: r 600ms ease-out forwards;
  opacity: 0.7;
}
@keyframes r {
  to {
    width: 280px;
    height: 280px;
    opacity: 0;
  }
}

// Ripple effect on click
document.querySelectorAll(".btn-glow").forEach((btn) => {
  btn.addEventListener("click", (e) => {
    const r = document.createElement("span");
    r.className = "ripple";
    r.style.left = e.offsetX + "px";
    r.style.top = e.offsetY + "px";
    btn.appendChild(r);
    setTimeout(() => r.remove(), 650);
  });
});