/* Bordered surface containers — panel headers and bodies. */
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--r); box-shadow: var(--shadow-sm); overflow: hidden; }
.panel + .panel { margin-top: 16px; }
.panel .panel-h { padding: 15px 18px; border-bottom: 1px solid var(--border); font-weight: 800; color: var(--ink); display: flex; align-items: center; justify-content: space-between; }
.panel .panel-b { padding: 16px 18px; }