diff --git a/popup.css b/popup.css
new file mode 100644
index 0000000..2022e47
--- /dev/null
+++ b/popup.css
@@ -0,0 +1,326 @@
+:root {
+    --bg-gradient: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
+    --panel-bg: #ffffff;
+    --text-primary: #1e3a8a;
+    --text-secondary: #64748b;
+    --accent-color: #3b82f6;
+    --accent-hover: #2563eb;
+    --danger-color: #ef4444;
+    --danger-hover: #dc2626;
+    --success-color: #10b981;
+    --border-color: rgba(59, 130, 246, 0.15);
+    --input-bg: rgba(239, 246, 255, 0.5);
+    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
+    --shadow-md: 0 4px 12px rgba(59, 130, 246, 0.08);
+}
+
+body {
+    width: 310px;
+    /* Reduced width */
+    margin: 0;
+    padding: 16px;
+    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+    background: var(--bg-gradient);
+    color: var(--text-primary);
+    user-select: none;
+}
+
+.header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 20px;
+    padding-bottom: 12px;
+    border-bottom: 1px solid var(--border-color);
+}
+
+h1 {
+    font-size: 16px;
+    font-weight: 600;
+    margin: 0;
+    background: linear-gradient(90deg, #2563eb, #3b82f6);
+    -webkit-background-clip: text;
+    background-clip: text;
+    -webkit-text-fill-color: transparent;
+}
+
+.icon-btn {
+    background: none;
+    border: none;
+    color: var(--accent-color);
+    cursor: pointer;
+    padding: 6px;
+    border-radius: 8px;
+    transition: all 0.2s ease;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+.icon-btn:hover {
+    background: rgba(59, 130, 246, 0.1);
+    color: var(--accent-hover);
+}
+
+.hidden {
+    display: none !important;
+}
+
+#add-form {
+    background: var(--panel-bg);
+    padding: 14px;
+    border-radius: 12px;
+    margin-bottom: 20px;
+    border: 1px solid var(--border-color);
+    box-shadow: var(--shadow-md);
+    animation: slideDown 0.2s ease-out;
+}
+
+@keyframes slideDown {
+    from {
+        opacity: 0;
+        transform: translateY(-10px);
+    }
+
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+.form-group {
+    margin-bottom: 12px;
+}
+
+select,
+input {
+    width: 100%;
+    box-sizing: border-box;
+    background: var(--input-bg);
+    border: 1px solid var(--border-color);
+    color: var(--text-primary);
+    padding: 10px 12px;
+    border-radius: 8px;
+    font-size: 13px;
+    outline: none;
+    transition: all 0.2s;
+    font-family: inherit;
+}
+
+select {
+    appearance: none;
+    cursor: pointer;
+}
+
+select option {
+    background: #ffffff;
+    color: var(--text-primary);
+}
+
+input::placeholder {
+    color: #94a3b8;
+}
+
+select:focus,
+input:focus {
+    border-color: var(--accent-color);
+    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
+    background: #ffffff;
+}
+
+.form-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 10px;
+}
+
+button {
+    font-family: inherit;
+    font-size: 12px;
+    font-weight: 500;
+    padding: 8px 16px;
+    border-radius: 8px;
+    cursor: pointer;
+    border: none;
+    transition: all 0.2s ease;
+}
+
+.primary-btn {
+    background: var(--accent-color);
+    color: white;
+}
+
+.primary-btn:hover {
+    background: var(--accent-hover);
+    box-shadow: var(--shadow-sm);
+}
+
+.secondary-btn {
+    background: rgba(100, 116, 139, 0.1);
+    color: var(--text-secondary);
+}
+
+.secondary-btn:hover {
+    background: rgba(100, 116, 139, 0.2);
+    color: var(--text-primary);
+}
+
+.rules-container {
+    max-height: 350px;
+    overflow-y: auto;
+    padding-right: 4px;
+}
+
+.rules-container::-webkit-scrollbar {
+    width: 6px;
+}
+
+.rules-container::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+.rules-container::-webkit-scrollbar-thumb {
+    background: rgba(59, 130, 246, 0.2);
+    border-radius: 10px;
+}
+
+.rules-container::-webkit-scrollbar-thumb:hover {
+    background: rgba(59, 130, 246, 0.4);
+}
+
+#rules-list {
+    list-style: none;
+    padding: 0;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+}
+
+.rule-item {
+    background: var(--panel-bg);
+    border: 1px solid var(--border-color);
+    border-radius: 12px;
+    padding: 10px 12px;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
+    box-shadow: var(--shadow-sm);
+    cursor: grab;
+}
+
+.rule-item:active {
+    cursor: grabbing;
+}
+
+.rule-item:hover {
+    border-color: rgba(59, 130, 246, 0.4);
+    transform: translateY(-2px);
+    box-shadow: var(--shadow-md);
+}
+
+.rule-item.dragging {
+    opacity: 0.5;
+    border: 2px dashed var(--accent-color);
+    transform: scale(0.98);
+}
+
+.drag-handle {
+    color: #cbd5e1;
+    margin-right: 8px;
+    display: flex;
+    align-items: center;
+    /* Not giving it a pointer cursor because the whole element is grab, but we highlight this to signify */
+}
+
+.rule-info {
+    flex-grow: 1;
+    overflow: hidden;
+    margin-right: 8px;
+    pointer-events: none;
+    /* easier dragging */
+}
+
+.rule-domain {
+    font-size: 13px;
+    font-weight: 600;
+    margin-bottom: 2px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    color: var(--text-primary);
+}
+
+.rule-env {
+    display: inline-block;
+    background: rgba(59, 130, 246, 0.1);
+    color: var(--accent-color);
+    padding: 2px 6px;
+    border-radius: 4px;
+    font-size: 10px;
+    margin-left: 6px;
+    vertical-align: middle;
+}
+
+.rule-acc {
+    font-size: 11px;
+    color: var(--text-secondary);
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.rule-actions {
+    display: flex;
+    gap: 4px;
+}
+
+.btn-execute {
+    color: var(--success-color);
+    background: rgba(16, 185, 129, 0.1);
+}
+
+.btn-execute:hover {
+    background: rgba(16, 185, 129, 0.2);
+    color: #059669;
+}
+
+.btn-delete {
+    color: var(--danger-color);
+    background: rgba(239, 68, 68, 0.1);
+}
+
+.btn-delete:hover {
+    background: rgba(239, 68, 68, 0.2);
+    color: #b91c1c;
+}
+
+.loading {
+    animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+    from {
+        transform: rotate(0deg);
+    }
+
+    to {
+        transform: rotate(360deg);
+    }
+}
+
+.empty-state {
+    text-align: center;
+    padding: 40px 0;
+    color: var(--text-secondary);
+    font-size: 13px;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 10px;
+}
+
+.empty-state svg {
+    color: #cbd5e1;
+}