@import url("https://fonts.googleapis.com/css2?family=Arsenal:wght@400;700&display=swap");

:root {
  --bg-overlay: rgba(255, 255, 255, 0.75);
  --glass: rgba(255, 255, 255, 0.45);
  --text: #2b2b36;
  --muted: #6c6c80;

  --pastel-1: #ffd5e1;
  --pastel-2: #cde6ff;
  --pastel-4: #ffd4dfbe;
  --accent: #e6a8ff;

  --h1-pink: #fd7eb9;
  --h1-blue: #3183ff;

  --ring: rgba(150, 114, 255, 0.35);
  --shadow: 0 8px 24px rgba(30, 22, 63, 0.12);
}

/* global */
* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  text-align: center;
  color: var(--text);
  font-family: "Arsenal", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background-image: linear-gradient(
      180deg,
      var(--bg-overlay),
      var(--bg-overlay)
    ),
    url("images/watercolor.jpg");
  background-size: cover;
  background-attachment: fixed;
  backdrop-filter: blur(1px);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1;
  margin-top: 60px;
}

footer {
  margin: 0;
  padding: 12px 0;
  width: 100%;
  border-top: 1px solid rgba(120, 120, 160, 0.1);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(6px);
  color: var(--muted);
  font-size: 15px;
}

footer p {
  margin: 4px 0;
}

/* head */
h1 {
  margin: 20px 0 80px;
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: 0.5px;
  background: linear-gradient(
    90deg,
    var(--h1-pink),
    var(--h1-blue),
    var(--pastel-1),
    var(--pastel-4),
    var(--accent),
    var(--pastel-2),
    var(--h1-pink),
    var(--h1-blue),
    var(--pastel-1),
    var(--pastel-4),
    var(--accent),
    var(--pastel-2),
    var(--h1-pink),
    var(--h1-blue),
    var(--pastel-1),
    var(--pastel-4),
    var(--accent),
    var(--pastel-2)
  );
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 300% 100%;
  animation: sweep 40s linear infinite;
}

@keyframes sweep {
  0% {
    background-position: 0% 50%;
  }
  100% {
    background-position: 300% 50%;
  }
}

/* layout */
.section {
  margin: 48px auto 32px;
  padding: 0 16px;
}

/* pad grid */
.set {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px 20px;
  margin: 25px auto 0;
}

.pad {
  width: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

/* pads */
.drum {
  width: 150px;
  height: 150px;
  border-radius: 24px;
  border: 1px solid rgba(120, 120, 160, 0.18);
  outline: none;
  font-weight: 700;
  font-size: 2.2rem;
  line-height: 150px;
  color: #433b74;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.8);
  background-color: var(--glass);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 65%;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
  transition: transform 140ms ease, box-shadow 140ms ease, filter 140ms ease;
  position: relative;
  user-select: none;
}

/* groups */
.loops .drum {
  box-shadow: 0 10px 24px rgba(154, 208, 255, 0.28);
}

.hits .drum {
  box-shadow: 0 10px 24px rgba(255, 213, 225, 0.28);
}

/* wasd colors */
.drum.w {
  --h: 500;
  color: #cba4ff;
}
.drum.a {
  --h: 10;
  color: #aabbff;
}
.drum.s {
  --h: 160;
  color: #74d1b1;
}
.drum.d {
  --h: 330;
  color: #ffa9cc;
}

/* hover/focus */
.drum:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 14px 32px rgba(255, 53, 221, 0.22);
}

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

/* active */
.drum.playing {
  transform: scale(1.08);
  box-shadow: 0 16px 36px rgba(255, 127, 202, 0.28);
  filter: saturate(1.6);
}

/* pastel bloom */
.drum::after {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: 36px;
  background: radial-gradient(
    circle at 50% 55%,
    hsla(var(--h, 260), 85%, 85%, 0.5),
    hsla(var(--h, 260), 85%, 85%, 0) 60%
  );
  filter: blur(12px);
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 200ms ease, transform 200ms ease;
  pointer-events: none;
}

.drum.playing::after {
  opacity: 1;
  transform: scale(1);
  animation: bloomPulse 2.4s ease-in-out infinite;
}

@keyframes bloomPulse {
  0%,
  100% {
    transform: scale(1);
    filter: blur(12px);
  }
  50% {
    transform: scale(1.04);
    filter: blur(14px);
  }
}

/* letter colors */
.drum.h {
  color: #82cfda;
}
.drum.j {
  color: hsl(228, 100%, 82%);
}
.drum.k {
  color: #e0a9ff;
}
.drum.l {
  color: #ffa8cb;
}
.drum.b {
  color: #ffc698;
}
.drum.n {
  color: #93eba9;
}

/* active letter colors */
.drum.playing,
.drum.pressed {
  color: #ff64d0;
}

.drum.w.playing,
.drum.w.pressed {
  color: #a780ff;
}
.drum.a.playing,
.drum.a.pressed {
  color: #5ca9ff;
}
.drum.s.playing,
.drum.s.pressed {
  color: #007259;
}
.drum.d.playing,
.drum.d.pressed {
  color: #ff79c3;
}

/* volume sliders */
.vol {
  width: 100%;
  appearance: none;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--pastel-2), var(--pastel-4));
  cursor: pointer;
  box-shadow: inset 0 1px 2px rgba(30, 22, 63, 0.15);
}

.vol::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: radial-gradient(circle at 30% 30%, #fff, #ffe9ff 60%, #e6a8ff);
  box-shadow: 0 2px 6px rgba(30, 22, 63, 0.25);
  transition: transform 120ms ease;
}

.vol:active::-webkit-slider-thumb {
  transform: scale(1.05);
}

.vol::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--pastel-2), var(--pastel-4));
}

.vol::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, #ffe9ff 60%, #e6a8ff);
  box-shadow: 0 2px 6px rgba(30, 22, 63, 0.25);
}