feat: redesign expanded row with detail-grid + history chart (#7)

public/css/shared.css

@@ -364,14 +364,99 @@ tr:last-child td {
     display: none;
 }
 
+@keyframes expandIn {
+    from { opacity: 0; transform: translateY(-4px); }
+    to   { opacity: 1; transform: translateY(0); }
+}
+
+.expanded-content.is-open {
+    animation: expandIn 0.2s ease;
+}
+
 .expanded-content td {
     padding: 0;
-    background: var(--surface-2);
+    background: color-mix(in oklab, var(--accent) 4%, var(--paper-2));
     border-top: 2px solid var(--accent);
 }
 
 .expanded-cell {
-    padding: 20px !important;
+    padding: 22px 28px 28px !important;
+}
+
+tr.row-open {
+    box-shadow: inset 3px 0 0 var(--accent);
+}
+
+/* ── Expanded Row Detail Grid ─────────────────── */
+
+.player-detail {
+    display: grid;
+    grid-template-columns: 240px 1fr;
+    gap: 28px;
+    align-items: start;
+}
+
+@media (max-width: 880px) {
+    .player-detail {
+        grid-template-columns: 1fr;
+    }
+}
+
+.detail-grid {
+    display: grid;
+    grid-template-columns: 1fr;
+    margin: 0;
+    padding: 0;
+    list-style: none;
+}
+
+.detail-grid > div {
+    display: flex;
+    justify-content: space-between;
+    align-items: baseline;
+    gap: 12px;
+    padding: 8px 0;
+    border-bottom: 1px dashed var(--line);
+}
+
+.detail-grid > div:last-child {
+    border-bottom: none;
+}
+
+.detail-grid dt {
+    color: var(--ink-2);
+    font-size: 13px;
+    font-weight: 400;
+    flex-shrink: 0;
+}
+
+.detail-grid dd {
+    color: var(--ink);
+    font-size: 13px;
+    font-family: var(--font-mono);
+    font-feature-settings: "tnum", "zero";
+    margin: 0;
+    text-align: right;
+}
+
+.player-chart {
+    width: 100%;
+    max-width: 880px;
+}
+
+.link-btn {
+    background: none;
+    border: none;
+    padding: 0;
+    font-family: var(--font-sans);
+    font-size: 13px;
+    cursor: pointer;
+    color: var(--accent);
+}
+
+.link-btn:disabled {
+    color: var(--ink-3);
+    cursor: default;
 }
 
 /* ── Links ────────────────────────────────────── */