Split the CSS from head.php into separate files.

src/css/player.css

@@ -0,0 +1,78 @@
+/* ═══════════════════════════════════════════
+     PLAYER PiP
+  ═══════════════════════════════════════════ */
+  .pip {
+    position: fixed;
+    bottom: 24px;
+    right: 24px;
+    width: 380px;
+    background: #000;
+    border: 1px solid var(--border-bright);
+    box-shadow: 0 8px 32px rgba(0,0,0,0.8);
+    z-index: 2000;
+    display: none;
+    flex-direction: column;
+  }
+  .pip.visible { display: flex; }
+  .pip-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    padding: 6px 10px;
+    background: var(--surface);
+    border-bottom: 1px solid var(--border);
+    gap: 8px;
+    flex-shrink: 0;
+  }
+  .pip-channel {
+    font-family: var(--font-mono);
+    font-size: 11px;
+    color: var(--accent);
+    letter-spacing: 0.08em;
+    text-transform: uppercase;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    flex: 1;
+  }
+  .pip-program {
+    font-size: 11px;
+    color: var(--text-dim);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    flex: 2;
+    text-align: center;
+  }
+  .pip-close {
+    background: none;
+    border: none;
+    color: var(--text-dim);
+    font-size: 18px;
+    cursor: pointer;
+    padding: 0 4px;
+    line-height: 1;
+    flex-shrink: 0;
+    transition: color 0.15s;
+  }
+  .pip-close:hover { color: var(--accent-live); }
+  .pip video {
+    width: 100%;
+    aspect-ratio: 16/9;
+    display: block;
+    background: #000;
+  }
+  .pip-error {
+    padding: 20px;
+    text-align: center;
+    font-family: var(--font-mono);
+    font-size: 11px;
+    color: var(--accent-live);
+    letter-spacing: 0.06em;
+  }
+  .channel-cell { cursor: pointer; }
+  .channel-cell:hover { background: var(--surface2); }
+  .program-block.is-live { cursor: pointer; }
+  @media (max-width: 600px) {
+    .pip { width: calc(100vw - 16px); bottom: 8px; right: 8px; left: 8px; }
+  }