diff --git a/dextpl/styles.css b/dextpl/styles.css
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+++ b/dextpl/styles.css
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+/* ============================================================
+   CSS custom properties — mirrors static/style.css theme
+   ============================================================ */
+:root {
+  --bg: linear-gradient(165deg, #b2d9f5 0%, #ceeabd 50%, #edf6e8 100%);
+  --card-bg: #ffffff;
+  --card-shadow: 0 4px 24px rgba(0,0,0,.10);
+  --text: #1a1d23;
+  --text-muted: #6b7280;
+  --border: #d1d5db;
+  --input-bg: #ffffff;
+  --input-focus-border: #2fa700;
+  --input-focus-shadow: 0 0 0 3px rgba(47,167,0,.15);
+  --btn-primary-bg: #2fa700;
+  --btn-primary-hover: #279100;
+  --btn-secondary-bg: #f3f4f6;
+  --btn-secondary-hover: #e5e7eb;
+  --btn-secondary-text: #374151;
+  --alert-error-bg: #fef2f2;
+  --alert-error-border: #fca5a5;
+  --alert-error-text: #991b1b;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --bg: linear-gradient(165deg, #06101e 0%, #091a0d 55%, #0f1117 100%);
+    --card-bg: #1e2130;
+    --card-shadow: 0 4px 24px rgba(0,0,0,.40);
+    --text: #e5e7eb;
+    --text-muted: #9ca3af;
+    --border: #374151;
+    --input-bg: #111827;
+    --input-focus-border: #35b800;
+    --input-focus-shadow: 0 0 0 3px rgba(53,184,0,.20);
+    --btn-primary-bg: #35b800;
+    --btn-primary-hover: #2fa700;
+    --btn-secondary-bg: #374151;
+    --btn-secondary-hover: #4b5563;
+    --btn-secondary-text: #d1d5db;
+    --alert-error-bg: #3b1515;
+    --alert-error-border: #7f1d1d;
+    --alert-error-text: #fca5a5;
+  }
+}
+
+/* ============================================================
+   Body & layout
+   ============================================================ */
+body.theme-body {
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+  font-size: 16px;
+  line-height: 1.6;
+  background: var(--bg);
+  background-attachment: fixed;
+  color: var(--text);
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 1.5rem;
+  padding: 2rem 1rem;
+}
+
+/* ============================================================
+   Navbar (brand bar — mirrors static/header.html .brand)
+   ============================================================ */
+.theme-navbar {
+  display: flex;
+  align-items: center;
+}
+
+.theme-navbar__logo-wrap {
+  display: flex;
+  align-items: center;
+  gap: 0.625rem;
+}
+
+.theme-navbar__logo {
+  height: 2rem;
+  width: auto;
+  object-fit: contain;
+}
+
+/* ============================================================
+   Container / Card
+   ============================================================ */
+.dex-container {
+  background: var(--card-bg);
+  border-radius: 12px;
+  box-shadow: var(--card-shadow);
+  padding: 2rem 2.5rem;
+  width: 100%;
+  max-width: 440px;
+  margin: 0 auto;
+  color: var(--text);
+  text-align: left;
+}
+
+/* ============================================================
+   Panel & heading
+   ============================================================ */
+.theme-panel {
+  width: 100%;
+}
+
+.theme-heading {
+  font-size: 1.375rem;
+  font-weight: 700;
+  letter-spacing: -0.02em;
+  color: var(--text);
+  margin-bottom: 1.25rem;
+  padding-bottom: 1rem;
+  border-bottom: 1px solid var(--border);
+}
+
+/* ============================================================
+   Form rows, labels, inputs
+   ============================================================ */
+.theme-form-row {
+  margin-bottom: 1rem;
+}
+
+.theme-form-label {
+  margin-bottom: 0.375rem;
+}
+
+.theme-form-label label {
+  font-size: 0.875rem;
+  font-weight: 500;
+  color: var(--text-muted);
+}
+
+.theme-form-input {
+  display: block;
+  width: 100%;
+  padding: 0.625rem 0.875rem;
+  font-size: 0.9375rem;
+  font-family: inherit;
+  background: var(--input-bg);
+  color: var(--text);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  transition: border-color .15s, box-shadow .15s;
+  outline: none;
+  -webkit-appearance: none;
+}
+
+.theme-form-input:focus {
+  border-color: var(--input-focus-border);
+  box-shadow: var(--input-focus-shadow);
+}
+
+.theme-form-input::placeholder {
+  color: var(--text-muted);
+}
+
+/* ============================================================
+   Buttons — override dex-btn base
+   ============================================================ */
+.dex-btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 100%;
+  padding: 0.625rem 1.25rem;
+  font-size: 0.9375rem;
+  font-family: inherit;
+  font-weight: 500;
+  border-radius: 8px;
+  border: 1px solid transparent;
+  cursor: pointer;
+  text-decoration: none;
+  transition: background .15s, color .15s, border-color .15s, box-shadow .15s;
+  white-space: nowrap;
+  box-shadow: none;
+}
+
+.dex-btn:active {
+  box-shadow: none;
+}
+
+/* Primary button (Login / Submit) */
+.theme-btn--primary {
+  background: var(--btn-primary-bg);
+  color: #ffffff;
+  border-color: var(--btn-primary-bg);
+  margin-top: 0.5rem;
+}
+
+.theme-btn--primary:hover {
+  background: var(--btn-primary-hover);
+  border-color: var(--btn-primary-hover);
+}
+
+/* Success button (Grant Access) */
+.theme-btn--success {
+  background: var(--btn-primary-bg);
+  color: #ffffff;
+  border-color: var(--btn-primary-bg);
+}
+
+.theme-btn--success:hover {
+  background: var(--btn-primary-hover);
+  border-color: var(--btn-primary-hover);
+}
+
+/* Provider / secondary button */
+.theme-btn-provider {
+  background: var(--btn-secondary-bg);
+  color: var(--btn-secondary-text);
+  border-color: var(--border);
+}
+
+.theme-btn-provider:hover {
+  background: var(--btn-secondary-hover);
+}
+
+/* Reset icon float so buttons stay flex */
+.dex-btn-icon {
+  float: none;
+  flex-shrink: 0;
+  border-radius: 4px;
+}
+
+.dex-btn-text {
+  flex: 1;
+  text-align: center;
+  line-height: normal;
+  padding: 0 0.5rem;
+}
+
+/* ============================================================
+   Error box
+   ============================================================ */
+.dex-error-box {
+  background: var(--alert-error-bg);
+  border: 1px solid var(--alert-error-border);
+  color: var(--alert-error-text);
+  border-radius: 8px;
+  padding: 0.75rem 1rem;
+  font-size: 0.9rem;
+  font-weight: normal;
+  max-width: 100%;
+  margin: 0.75rem 0;
+  text-align: left;
+}
+
+/* ============================================================
+   Separator & subtle text
+   ============================================================ */
+.dex-separator {
+  border: none;
+  border-top: 1px solid var(--border);
+  margin: 1rem 0;
+  color: transparent;
+}
+
+.dex-subtle-text {
+  color: var(--text-muted);
+  font-size: 0.875rem;
+}
+
+.dex-list {
+  color: var(--text-muted);
+  font-size: 0.875rem;
+  text-align: left;
+  display: inline-block;
+  list-style: circle;
+  margin-top: 0.5rem;
+}
+
+/* ============================================================
+   Back link
+   ============================================================ */
+.theme-link-back {
+  margin-top: 1rem;
+  text-align: center;
+}
+
+.theme-link-back a {
+  color: var(--btn-primary-bg);
+  text-decoration: none;
+  font-size: 0.875rem;
+}
+
+.theme-link-back a:hover {
+  text-decoration: underline;
+}