diff --git a/app/static/app.css b/app/static/app.css
new file mode 100644
index 0000000..a773caa
--- /dev/null
+++ b/app/static/app.css
@@ -0,0 +1,251 @@
+/* 커스텀 스타일 — design-ref.md (Toss 스타일) 기반. Pico 뒤에 로드해 변수 오버라이드.
+   폰트는 폐쇄망 대비 로컬 동봉(static/fonts), CDN 의존 없음. */
+
+@font-face {
+  font-family: "Pretendard Variable";
+  font-weight: 45 920;
+  font-style: normal;
+  font-display: swap;
+  src: url("/static/fonts/PretendardVariable.woff2") format("woff2-variations");
+}
+
+:root {
+  /* palette (design-ref §2) */
+  --bg: #ffffff;
+  --bg-alt: #f9fafb;
+  --surface: #f2f4f6;
+  --surface-2: #e8f3ff;
+  --text: #191f28;
+  --text-secondary: #333d4b;
+  --text-muted: #6b7684;
+  --text-dim: #8b95a1;
+  --border: #e5e8eb;
+  --border-strong: #d1d6db;
+  --accent: #3182f6;
+  --accent-hover: #1b64da;
+  --accent-deep: #1e40af;
+  --accent-soft: #e8f3ff;
+  /* 밝은 상태색은 옅은 배경 위 대비 위해 텍스트용으로 약간 어둡게 */
+  --success-text: #00a37a;
+  --warning-text: #c5700a;
+  --danger: #f04452;
+
+  --radius-card: 12px;
+
+  /* Pico 매핑 */
+  --pico-font-family-sans-serif: "Pretendard Variable", -apple-system,
+    BlinkMacSystemFont, "Apple SD Gothic Neo", "Segoe UI", "Noto Sans KR",
+    system-ui, sans-serif;
+  --pico-font-family: var(--pico-font-family-sans-serif);
+  --pico-line-height: 1.55;
+  --pico-border-radius: 7px; /* 버튼/인풋 (design-ref §4) */
+  --pico-background-color: var(--bg-alt);
+  --pico-color: var(--text-secondary);
+  --pico-h1-color: var(--text);
+  --pico-h2-color: var(--text);
+  --pico-h3-color: var(--text);
+  --pico-muted-color: var(--text-muted);
+  --pico-primary: #ffffff;
+  --pico-primary-background: var(--accent);
+  --pico-primary-hover-background: var(--accent-hover);
+  --pico-primary-border: var(--accent);
+  --pico-primary-hover-border: var(--accent-hover);
+  --pico-card-background-color: var(--bg);
+  --pico-card-border-color: var(--border);
+  --pico-card-box-shadow: 0 1px 3px rgba(25, 31, 40, 0.04);
+}
+
+body {
+  background: var(--bg-alt);
+  color: var(--text-secondary);
+}
+
+main.container {
+  max-width: 1040px;
+  padding-block: 32px;
+}
+
+h1,
+h2,
+h3 {
+  color: var(--text);
+  font-weight: 700;
+  letter-spacing: -0.01em;
+}
+h2 {
+  font-size: 20px;
+  margin: 0;
+}
+
+section {
+  margin-bottom: 40px;
+}
+
+/* 상단 내비 (design-ref §4 web top nav: white, 1px bottom border) */
+.app-nav {
+  background: var(--bg);
+  border-bottom: 1px solid var(--border);
+}
+.app-nav .container {
+  max-width: 1040px;
+  padding-block: 16px;
+}
+.app-nav .brand {
+  margin: 0;
+  font-size: 17px;
+  font-weight: 700;
+  color: var(--text);
+  letter-spacing: -0.01em;
+}
+.app-nav .brand .accent {
+  color: var(--accent);
+}
+
+.section-head {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 16px;
+}
+
+/* 요약 카드 */
+.summary {
+  display: grid;
+  grid-template-columns: repeat(4, 1fr);
+  gap: 16px;
+  margin-bottom: 24px;
+}
+.summary .card {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-card);
+  padding: 20px;
+  box-shadow: 0 1px 3px rgba(25, 31, 40, 0.04);
+}
+.summary .value {
+  font-size: 32px;
+  font-weight: 700;
+  color: var(--text);
+  line-height: 1.1;
+  font-variant-numeric: tabular-nums; /* 숫자 정렬 (design-ref §3) */
+}
+.summary .label {
+  margin-top: 6px;
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--text-muted);
+}
+
+/* 저장소 표 (카드로 감싸기, hairline 행) */
+.table-card {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-card);
+  overflow: hidden;
+  box-shadow: 0 1px 3px rgba(25, 31, 40, 0.04);
+}
+.table-card table {
+  margin: 0;
+}
+.table-card thead th {
+  font-size: 12px;
+  font-weight: 600;
+  color: var(--text-dim);
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+  border-bottom: 1px solid var(--border);
+}
+.table-card tbody td {
+  border-bottom: 1px solid var(--border);
+  padding-block: 16px;
+  vertical-align: middle;
+}
+.table-card tbody tr:last-child td {
+  border-bottom: none;
+}
+.repo-name {
+  font-weight: 600;
+  color: var(--text);
+}
+.num {
+  font-variant-numeric: tabular-nums;
+}
+td.num,
+th.num {
+  text-align: right;
+}
+
+/* 검증 배지 칩 (dot + 라벨, 이모지 없음) */
+.badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 10px;
+  border-radius: 999px;
+  font-size: 13px;
+  font-weight: 500;
+  white-space: nowrap;
+}
+.badge::before {
+  content: "";
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  background: currentColor;
+}
+.badge-pass {
+  color: var(--success-text);
+  background: rgba(0, 200, 150, 0.12);
+}
+.badge-warn {
+  color: var(--warning-text);
+  background: rgba(255, 149, 0, 0.13);
+}
+.badge-unset {
+  color: var(--text-muted);
+  background: var(--surface);
+}
+
+/* 보조 버튼: 틴티드 블루 (design-ref §4 two-step blue) */
+button.secondary,
+[role="button"].secondary,
+a.secondary {
+  --pico-background-color: var(--surface-2);
+  --pico-border-color: var(--surface-2);
+  --pico-color: var(--accent-hover);
+  font-weight: 500;
+}
+button:disabled,
+[role="button"]:disabled {
+  opacity: 0.45;
+}
+
+/* 연결 상태 표시 (dot + 텍스트) */
+.status-line {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  font-weight: 500;
+}
+.status-line::before {
+  content: "";
+  width: 9px;
+  height: 9px;
+  border-radius: 50%;
+  background: currentColor;
+}
+.status-ok {
+  color: var(--success-text);
+}
+.status-bad {
+  color: var(--danger);
+}
+.status-loading {
+  color: var(--text-muted);
+}
+
+@media (max-width: 640px) {
+  .summary {
+    grid-template-columns: repeat(2, 1fr);
+  }
+}
diff --git a/app/static/fonts/PretendardVariable.woff2 b/app/static/fonts/PretendardVariable.woff2
new file mode 100644
index 0000000..49c54b5
Binary files /dev/null and b/app/static/fonts/PretendardVariable.woff2 differ