Back to CSS Split Screen Music App Toggle Pure CSS
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.ss-mus {
  position: relative;
  display: grid;
  grid-template-columns: 50% 50%;
  min-height: 480px;
  font-family: 'Inter', system-ui, sans-serif;
  background: #0e0a1f;
  color: #e6e0ff;
  border-radius: 0; overflow: hidden;
  transition: grid-template-columns 0.4s cubic-bezier(0.32, 0.72, 0, 1);
}
.ss-mus:has(input:checked) { grid-template-columns: 30% 70%; }
.ss-mus input { position: absolute; width: 1px; height: 1px; opacity: 0; clip: rect(0 0 0 0); }
.ss-mus-list {
  background: #15102a;
  padding: 30px 24px;
  display: flex; flex-direction: column; gap: 16px;
  border-right: 1px solid rgba(74,222,128,0.25);
  overflow-y: auto;
}
.ss-mus-list header {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.ss-mus-list h3 {
  margin: 0;
  font-size: 13px; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: #4ade80;
}
.ss-mus-toggle {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.12em;
  padding: 5px 10px;
  background: rgba(74,222,128,0.12);
  color: #4ade80;
  border: 1px solid rgba(74,222,128,0.4);
  cursor: pointer;
  transition: background 0.14s;
}
.ss-mus-toggle:hover { background: rgba(74,222,128,0.24); }
.ss-mus-list ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.ss-mus-list li {
  display: grid; grid-template-columns: 38px 1fr auto; align-items: center; gap: 12px;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.14s;
}
.ss-mus-list li:hover { background: rgba(255,255,255,0.04); }
.ss-mus-list li.active { background: rgba(74,222,128,0.1); border: 1px solid rgba(74,222,128,0.3); padding: 9px; }
.ss-mus-cover {
  width: 38px; height: 38px;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}
.ss-mus-list strong { display: block; font-size: 13.5px; font-weight: 700; color: #f0eaff; }
.ss-mus-list em { display: block; font-size: 11px; font-style: normal; color: #8a7fb0; margin-top: 2px; }
.ss-mus-time { font-family: 'Courier New', monospace; font-size: 11px; color: #8a7fb0; }
.ss-mus-now {
  background:
    radial-gradient(60% 80% at 70% 30%, rgba(124,58,237,0.4) 0%, transparent 60%),
    radial-gradient(60% 80% at 30% 70%, rgba(74,222,128,0.18) 0%, transparent 60%),
    #0e0a1f;
  padding: 40px 44px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 36px;
  align-items: center;
}
.ss-mus-vinyl {
  position: relative;
  width: 200px; height: 200px;
  flex-shrink: 0;
}
.ss-mus-disc {
  position: absolute; inset: 0;
  border-radius: 50%;
  background:
    repeating-radial-gradient(circle at 50% 50%, transparent 0 4px, rgba(255,255,255,0.04) 4px 5px),
    radial-gradient(circle at 50% 50%, #ec4899 0%, #ec4899 14%, #0a0a0a 14%, #0a0a0a 100%);
  box-shadow:
    inset 0 0 0 14px #1a1a1a,
    0 14px 40px rgba(0,0,0,0.6);
  animation: ss-mus-spin 8s linear infinite;
}
.ss-mus-hole {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 16px; height: 16px;
  border-radius: 50%;
  background: #0e0a1f;
  box-shadow: 0 0 0 3px #4ade80;
}
@keyframes ss-mus-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .ss-mus-disc { animation: none; } }
.ss-mus-meta { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.ss-mus-eye {
  font-family: 'Courier New', monospace;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.24em;
  color: #4ade80;
  text-shadow: 0 0 12px rgba(74,222,128,0.4);
}
.ss-mus-meta h2 {
  margin: 0;
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 500;
  line-height: 0.94;
  color: #f0eaff;
  letter-spacing: -0.02em;
  font-style: italic;
}
.ss-mus-sub { margin: 0; font-size: 13px; color: #a89cc8; letter-spacing: 0.04em; }
.ss-mus-bar {
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}
.ss-mus-bar span {
  display: block; height: 100%;
  background: linear-gradient(90deg, #4ade80 0%, #ec4899 100%);
  border-radius: 2px;
  box-shadow: 0 0 12px rgba(74,222,128,0.5);
}
.ss-mus-times { display: flex; justify-content: space-between; font-family: 'Courier New', monospace; font-size: 11px; color: #8a7fb0; }
.ss-mus-ctrl { display: flex; gap: 12px; align-items: center; margin-top: 6px; }
.ss-mus-ctrl button {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.18);
  background: transparent;
  color: #f0eaff;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.14s, border-color 0.14s;
}
.ss-mus-ctrl button:hover { background: rgba(255,255,255,0.06); border-color: #4ade80; color: #4ade80; }
.ss-mus-play {
  width: 52px !important; height: 52px !important;
  background: linear-gradient(135deg, #4ade80 0%, #22c55e 100%) !important;
  color: #0e0a1f !important;
  border: 0 !important;
  font-size: 16px !important;
  box-shadow: 0 8px 22px rgba(74,222,128,0.45) !important;
}
.ss-mus-play:hover { transform: scale(1.05); }
@media (max-width: 720px) {
  .ss-mus, .ss-mus:has(input:checked) { grid-template-columns: 1fr; }
  .ss-mus-now { grid-template-columns: 1fr; justify-items: center; text-align: center; }
}
<section class="ss-mus" aria-label="Music player split">
  <input id="ss-mus-t" type="checkbox" />
  <article class="ss-mus-list" aria-label="Album list">
    <header>
      <h3>Library</h3>
      <label for="ss-mus-t" class="ss-mus-toggle" aria-controls="ss-mus-now">⇋ Focus</label>
    </header>
    <ul>
      <li class="active">
        <span class="ss-mus-cover" style="background:linear-gradient(135deg,#7c3aed,#ec4899);"></span>
        <div><strong>Midnight Drive</strong><em>Aurelia · Side A</em></div>
        <span class="ss-mus-time">3:42</span>
      </li>
      <li>
        <span class="ss-mus-cover" style="background:linear-gradient(135deg,#0ea5e9,#22d3ee);"></span>
        <div><strong>Glass Hearts</strong><em>Aurelia · Side B</em></div>
        <span class="ss-mus-time">4:18</span>
      </li>
      <li>
        <span class="ss-mus-cover" style="background:linear-gradient(135deg,#f59e0b,#ef4444);"></span>
        <div><strong>Cherry Static</strong><em>Various</em></div>
        <span class="ss-mus-time">2:54</span>
      </li>
      <li>
        <span class="ss-mus-cover" style="background:linear-gradient(135deg,#10b981,#84cc16);"></span>
        <div><strong>Forest Floor</strong><em>Aurelia</em></div>
        <span class="ss-mus-time">5:02</span>
      </li>
    </ul>
  </article>
  <article class="ss-mus-now" id="ss-mus-now" aria-label="Now playing">
    <div class="ss-mus-vinyl" aria-hidden="true">
      <span class="ss-mus-disc"></span>
      <span class="ss-mus-hole"></span>
    </div>
    <div class="ss-mus-meta">
      <span class="ss-mus-eye">▸ NOW PLAYING</span>
      <h2>Midnight<br/>Drive.</h2>
      <p class="ss-mus-sub">Aurelia · Side A · Track 03</p>
      <div class="ss-mus-bar" aria-label="Track progress" role="progressbar" aria-valuenow="42" aria-valuemin="0" aria-valuemax="100"><span style="width:42%"></span></div>
      <div class="ss-mus-times">
        <span>1:33</span><span>3:42</span>
      </div>
      <div class="ss-mus-ctrl">
        <button type="button" aria-label="Previous">⏮</button>
        <button type="button" aria-label="Play" class="ss-mus-play">▶</button>
        <button type="button" aria-label="Next">⏭</button>
      </div>
    </div>
  </article>
</section>
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