diff --git a/services/web-ui/public/styles-modal.css b/services/web-ui/public/styles-modal.css
new file mode 100644
index 0000000..6285858
--- /dev/null
+++ b/services/web-ui/public/styles-modal.css
@@ -0,0 +1,168 @@
+/* ========== Modal ========== */
+.modal-backdrop {
+  position: fixed; inset: 0;
+  background: rgba(5,7,12,0.65);
+  backdrop-filter: blur(6px);
+  display: grid; place-items: center;
+  z-index: 200;
+  animation: fadeIn 160ms ease;
+}
+.modal {
+  width: 640px;
+  max-width: calc(100vw - 40px);
+  max-height: calc(100vh - 60px);
+  background: var(--bg-1);
+  border: 1px solid var(--border-strong);
+  border-radius: var(--r-xl);
+  box-shadow: var(--shadow-pop);
+  display: flex; flex-direction: column;
+  overflow: hidden;
+  animation: modalIn 200ms ease;
+}
+@keyframes modalIn {
+  from { transform: translateY(10px) scale(0.98); opacity: 0; }
+  to { transform: none; opacity: 1; }
+}
+.modal-head {
+  display: flex; align-items: center;
+  padding: 16px 20px;
+  border-bottom: 1px solid var(--border);
+  gap: 16px;
+}
+.modal-head > :first-child { flex: 1; }
+.modal-body {
+  flex: 1;
+  overflow-y: auto;
+  padding: 16px 20px;
+  display: flex; flex-direction: column;
+  gap: 14px;
+}
+.modal-foot {
+  display: flex; align-items: center;
+  padding: 12px 20px;
+  border-top: 1px solid var(--border);
+  gap: 8px;
+  background: var(--bg-0);
+}
+.modal-section {
+  background: var(--bg-2);
+  border: 1px solid var(--border);
+  border-radius: var(--r-md);
+  overflow: hidden;
+}
+.modal-section-head {
+  display: flex; align-items: center;
+  padding: 8px 12px;
+  border-bottom: 1px solid var(--border);
+  font-size: 11px;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  font-weight: 600;
+  color: var(--text-3);
+}
+.modal-section-body { padding: 12px; }
+.modal-toggle-row {
+  display: flex; align-items: flex-start; gap: 12px;
+  padding: 4px 0;
+}
+.source-type-grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 8px;
+}
+.source-type-card {
+  display: flex; align-items: flex-start; gap: 10px;
+  padding: 12px;
+  background: var(--bg-2);
+  border: 1px solid var(--border);
+  border-radius: var(--r-sm);
+  text-align: left;
+  cursor: pointer;
+  transition: border 80ms, background 80ms;
+}
+.source-type-card:hover { border-color: var(--border-stronger); }
+.source-type-card.active { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
+.source-type-icon {
+  width: 28px; height: 28px;
+  border-radius: 6px;
+  background: var(--bg-3);
+  color: var(--text-2);
+  display: grid; place-items: center;
+  flex-shrink: 0;
+}
+.source-type-card.active .source-type-icon { background: var(--accent-soft-2); color: var(--accent); }
+
+.switch { display: inline-block; position: relative; flex-shrink: 0; cursor: pointer; }
+.switch input { position: absolute; opacity: 0; pointer-events: none; }
+.switch-track {
+  display: block;
+  width: 32px; height: 18px;
+  background: var(--bg-3);
+  border-radius: 99px;
+  transition: background 120ms;
+  position: relative;
+}
+.switch input:checked ~ .switch-track { background: var(--accent); }
+.switch-knob {
+  position: absolute;
+  top: 2px; left: 2px;
+  width: 14px; height: 14px;
+  background: white;
+  border-radius: 50%;
+  transition: left 120ms;
+}
+.switch input:checked ~ .switch-track .switch-knob { left: 16px; }
+
+.sdi-port-mini {
+  display: grid;
+  grid-template-columns: 60px 1fr;
+  gap: 12px;
+  padding: 12px;
+  background: var(--bg-2);
+  border: 1px solid var(--border);
+  border-radius: var(--r-sm);
+  align-items: stretch;
+}
+.sdi-mini-card {
+  background: linear-gradient(180deg, #1c1f28, #0d0e13);
+  border: 1px solid var(--border-strong);
+  border-radius: 4px;
+  padding: 8px 2px;
+  display: flex;
+}
+.sdi-mini-label {
+  writing-mode: vertical-rl;
+  transform: rotate(180deg);
+  font-family: var(--font-mono);
+  font-size: 8px;
+  letter-spacing: 0.12em;
+  color: var(--text-3);
+  margin: 0 auto;
+}
+.sdi-mini-ports { display: flex; flex-direction: column; gap: 4px; }
+.sdi-mini-port {
+  display: flex; align-items: center; gap: 8px;
+  padding: 8px 10px;
+  background: var(--bg-1);
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  text-align: left;
+  cursor: pointer;
+}
+.sdi-mini-port:hover { border-color: var(--border-stronger); }
+.sdi-mini-port.active { background: var(--accent-soft); border-color: var(--accent); }
+.sdi-mini-radio {
+  width: 14px; height: 14px;
+  border-radius: 50%;
+  border: 1.5px solid var(--text-4);
+  display: grid; place-items: center;
+  flex-shrink: 0;
+}
+.sdi-mini-port.active .sdi-mini-radio { border-color: var(--accent); }
+.sdi-mini-radio-dot {
+  width: 6px; height: 6px;
+  border-radius: 50%;
+  background: var(--accent);
+  opacity: 0;
+}
+.sdi-mini-port.active .sdi-mini-radio-dot { opacity: 1; }