diff --git a/resources/tester/test_200_1_b09_box_tool_line.py b/resources/tester/test_200_1_b09_box_tool_line.py
index 57d9e08fc..eea635ee6 100644
--- a/resources/tester/test_200_1_b09_box_tool_line.py
+++ b/resources/tester/test_200_1_b09_box_tool_line.py
@@ -116,3 +116,85 @@ def test_잇기():
     assert "attachHoverInfo(hint," in groups
     cards = (ROOT / COMMON).read_text("utf-8")
     assert "if (opts.lead) bar.append(opts.lead);" in cards
+
+
+# ── 200-3 카드 제목 줄 · 합계 줄 바탕색(밝음 · 어두움) ─────────────────────────
+
+
+def _theme_vars(dark: bool) -> dict:
+    """테마 CSS 의 `:root`(밝음) · 어두움 덮어쓰기 토큰 → 한 벌."""
+    css = (ROOT / "ui_template" / "ui_template_theme.css").read_text("utf-8")
+    light = dict(re.findall(r"(--[\w-]+):\s*([^;]+);", _block(css, ":root")))
+    if dark:
+        light.update(re.findall(r"(--[\w-]+):\s*([^;]+);", _block(css, ':root[data-theme="dark"]')))
+    return light
+
+
+def _rgb(token: str, theme: dict) -> tuple:
+    """토큰 → (r, g, b) · var() 별칭 따라감 · 16진수만."""
+    val = theme[token].split("/*")[0].strip()
+    while m := re.fullmatch(r"var\((--[\w-]+)\)", val):
+        val = theme[m.group(1)].split("/*")[0].strip()
+    assert re.fullmatch(r"#[0-9a-fA-F]{6}", val), (token, val)
+    return tuple(int(val[i : i + 2], 16) for i in (1, 3, 5))
+
+
+def _mix(spec: str, theme: dict) -> tuple:
+    """`color-mix(in srgb, var(A) N%, var(B))` → 섞은 (r, g, b)."""
+    m = re.fullmatch(
+        r"color-mix\(in srgb,\s*var\((--[\w-]+)\)\s*(\d+)%,\s*var\((--[\w-]+)\)\)", spec
+    )
+    assert m, spec
+    a, n, b = _rgb(m.group(1), theme), int(m.group(2)) / 100, _rgb(m.group(3), theme)
+    return tuple(a[i] * n + b[i] * (1 - n) for i in range(3))
+
+
+def _lum(c: tuple) -> float:
+    ch = [
+        (v / 255) / 12.92 if v / 255 <= 0.03928 else (((v / 255) + 0.055) / 1.055) ** 2.4 for v in c
+    ]
+    return 0.2126 * ch[0] + 0.7152 * ch[1] + 0.0722 * ch[2]
+
+
+def _contrast(a: tuple, b: tuple) -> float:
+    hi, lo = sorted((_lum(a), _lum(b)), reverse=True)
+    return (hi + 0.05) / (lo + 0.05)
+
+
+def _tokens() -> tuple:
+    css = (ROOT / "ui_template" / "ui_template_group_cards.css").read_text("utf-8")
+    root = _block(css, ".ui-group-cards")
+    head = re.search(r"--group-head-bg:\s*([^;]+);", root)
+    foot = re.search(r"--group-foot-bg:\s*([^;]+);", root)
+    assert head and foot
+    return css, head.group(1), foot.group(1)
+
+
+def test_카드_제목_줄과_합계_줄_바탕색_토큰():
+    css, head, foot = _tokens()
+    assert head != foot
+    assert "background-color: var(--group-head-bg)" in _block(css, ".ui-group-card__head")
+    assert "background-color: var(--group-foot-bg)" in _block(css, ".ui-group-card__foot")
+    for spec in (head, foot):  # 고른 값 없이 테마 변수만(색 고정값 없음)
+        assert "#" not in spec and "rgb(" not in spec
+
+
+def test_밝음_어두움_두_색이_다르고_글_대비_유지():
+    _, head, foot = _tokens()
+    for dark in (False, True):
+        theme = _theme_vars(dark)
+        h, f = _mix(head, theme), _mix(foot, theme)
+        assert sum(abs(h[i] - f[i]) for i in range(3)) >= 40, (dark, h, f)  # 서로 다른 색
+        card = _rgb("--color-surface-raised", theme)
+        assert sum(abs(f[i] - card[i]) for i in range(3)) >= 40  # 카드 바탕과도 구분
+        for color in ("--color-text", "--color-text-secondary", "--color-accent"):
+            assert _contrast(_rgb(color, theme), h) >= 4.5, (dark, "head", color)
+        for color in ("--color-text", "--color-text-body", "--color-text-secondary"):
+            assert _contrast(_rgb(color, theme), f) >= 4.5, (dark, "foot", color)
+
+
+def test_어두움_테마_값():
+    # 어두움 테마에서 쓰는 토큰이 실제로 어두움 값으로 덮임(밝음 값 그대로가 아님)
+    light, dark = _theme_vars(False), _theme_vars(True)
+    for token in ("--color-surface", "--color-surface-raised", "--color-accent"):
+        assert _rgb(token, light) != _rgb(token, dark), token
diff --git a/ui_template/ui_template_group_cards.css b/ui_template/ui_template_group_cards.css
index ed4f4f584..677c99a50 100644
--- a/ui_template/ui_template_group_cards.css
+++ b/ui_template/ui_template_group_cards.css
@@ -1,6 +1,9 @@
 /* 묶음 카드 공용 양식(171-2) — 글자 14px 한 벌 · 줄 간격 좁게 · 숫자 오른쪽. 색은 테마 변수만. */
 
 .ui-group-cards {
+  /* 200-3 제목 줄 = 표 머리색 계열(옅게) · 합계 줄 = 강조색 더 짙게 — 둘 다 테마 변수에서 섞음(밝음 · 어두움 같이) */
+  --group-head-bg: color-mix(in srgb, var(--color-accent) 6%, var(--color-surface-raised));
+  --group-foot-bg: color-mix(in srgb, var(--color-accent) 15%, var(--color-surface-raised));
   display: flex;
   flex-direction: column;
   gap: var(--spacing-8);
@@ -68,7 +71,8 @@
   flex-wrap: wrap;
   align-items: baseline;
   column-gap: var(--spacing-8);
-  padding: 2px 0;
+  padding: 2px var(--spacing-4);
+  background-color: var(--group-head-bg);
   border-bottom: 1px solid var(--color-border);
   font-weight: var(--font-weight-bold);
 }
@@ -148,6 +152,7 @@
   justify-content: flex-end;
   column-gap: var(--spacing-8);
   padding: 2px var(--spacing-4);
+  background-color: var(--group-foot-bg);
   border-top: 1px solid var(--color-border);
   font-variant-numeric: tabular-nums;
 }