diff --git a/AGENTS.md b/AGENTS.md
index 438aaa2..eda4943 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -70,7 +70,8 @@ not for the public pages. See `docs/design-principles.md` for the design.
     in the site editor via `/_api/settings`; empty = no header link and
     no `<title>` suffix. `Data.theme` is the active theme name (empty =
     none/base only); themes are folders in `pagerite/themes/{name}`
-    containing `theme.css` and/or `banner.css` (+ `banner.svg` artwork),
+    containing `theme.css` and/or `banner.css` (+ `banner.svg` artwork and
+    any extra assets the CSS references, like summer's `grass.svg`),
     served by the backend at `/_themes/{name}/...` — read from disk per
     request (etag by mtime), never built, so on-disk edits show on the
     next page load even in prod. The theme selector and banner-design
@@ -154,7 +155,13 @@ not for the public pages. See `docs/design-principles.md` for the design.
       brand; `nitro` = racing/HUD style following `prefers-color-scheme`
       (warm light-grey page, deep violet in dark), Montserrat/Literata,
       black as an accent only, a straight orange blade under the banner, and
-      an orange racing-tab nav clipped with a bezier `shape()`) and the
+      an orange racing-tab nav clipped with a bezier `shape()`; `summer` =
+      light playful meadow, one palette sampled from its illustrated
+      `banner.svg` (sky/grass/sun/flower pink), Fraunces/Literata, a tilted
+      gradient brand, flower bullets, and a layered-parallax banner (sun
+      rises, clouds drift, nearer hills move less) with idle animations
+      (swaying flowers, floating clouds, breathing sun glow) wrapped in
+      `prefers-reduced-motion: no-preference`) and the
       companion `banner.css` banner designs are served by the backend.
     - Vite builds ES-module `.js` outputs; the backend renders `<script
       type="module">` for them (module scripts defer by default).
diff --git a/pagerite/app.py b/pagerite/app.py
index 84567b9..3a4d1e6 100644
--- a/pagerite/app.py
+++ b/pagerite/app.py
@@ -412,14 +412,16 @@ async def delete_file(name: str) -> None:
 
 @app.get("/_themes/{name}/{filename}")
 async def theme_file(name: str, filename: str, request: Request) -> Response:
-    """Serve a theme/banner-design stylesheet from pagerite/themes/{name}/.
+    """Serve a theme/banner-design file from pagerite/themes/{name}/.
 
-    Read from disk on every request (etag by mtime+size): theme files are
-    never built or content-hashed, so edits on disk show on the next page
-    load, in prod as well as dev.
+    Stylesheets plus any extra assets the CSS references (like summer's
+    grass.svg). Read from disk on every request (etag by mtime+size):
+    theme files are never built or content-hashed, so edits on disk show
+    on the next page load, in prod as well as dev.
     """
     if (
-        filename not in {"theme.css", "banner.css"}
+        "/" in filename
+        or filename.startswith(".")
         or "/" in name
         or name.startswith(".")
     ):
@@ -429,12 +431,15 @@ async def theme_file(name: str, filename: str, request: Request) -> Response:
         stat = path.stat()
     except FileNotFoundError:
         raise HTTPException(404) from None
+    if not path.is_file():
+        raise HTTPException(404)
     etag = f'"{stat.st_mtime_ns:x}-{stat.st_size:x}"'
     if request.headers.get("if-none-match") == etag:
         return Response(status_code=304)
+    mime = mimetypes.guess_type(filename)[0] or "application/octet-stream"
     return Response(
         path.read_bytes(),
-        media_type="text/css",
+        media_type=mime,
         headers={"etag": etag, "cache-control": "no-cache"},
     )
 
diff --git a/pagerite/themes/summer/banner.css b/pagerite/themes/summer/banner.css
new file mode 100644
index 0000000..99118c2
--- /dev/null
+++ b/pagerite/themes/summer/banner.css
@@ -0,0 +1,75 @@
+/* Summer banner design: a bright illustrated meadow (inlined by the
+   backend into #page-banner) — rolling hills, leafy bushes, swaying
+   flowers, drifting clouds and a sun that rises as you scroll. */
+
+#banner {
+  min-height: 15rem;
+}
+
+/* The artwork fades into the page background at its bottom edge. */
+.summer-fade {
+  stop-color: var(--bg);
+}
+
+/* Layered parallax on top of the whole-artwork drift (pagerite.js sets
+   --pry on <html>): the sun rises fastest, the clouds lag behind, and the
+   nearer a hill the less it moves — a cheap depth cue while scrolling. */
+#page-banner .sun,
+#page-banner .sun-glow {
+  transform-box: fill-box;
+  transform: translateY(calc(var(--pry, 0px) * -1.5));
+}
+
+#page-banner .clouds {
+  transform: translateY(calc(var(--pry, 0px) * -0.7));
+}
+
+#page-banner .hills-far {
+  transform: translateY(calc(var(--pry, 0px) * -0.3));
+}
+
+#page-banner .hills-near {
+  transform: translateY(calc(var(--pry, 0px) * -0.15));
+}
+
+#page-banner .meadow {
+  transform: translateY(calc(var(--pry, 0px) * -0.05));
+}
+
+/* Idle animations: the sun breathes, clouds float sideways, flowers sway.
+   Each animated group is a transform-less wrapper so the CSS transform
+   never clobbers the placement transforms inside. */
+@media (prefers-reduced-motion: no-preference) {
+  #page-banner .sun-glow {
+    animation: summer-sun 9s ease-in-out infinite alternate;
+  }
+
+  #page-banner .cloud-a { animation: summer-drift 56s ease-in-out infinite alternate; }
+  #page-banner .cloud-b { animation: summer-drift 73s ease-in-out infinite alternate-reverse; }
+  #page-banner .cloud-c { animation: summer-drift 64s ease-in-out infinite alternate; }
+
+  #page-banner .flower {
+    transform-box: fill-box;
+    transform-origin: 50% 100%;
+    animation: summer-sway 5s ease-in-out infinite alternate;
+  }
+
+  /* Stagger the sway so the meadow doesn't move in lockstep. */
+  #page-banner .flower:nth-child(3n) { animation-delay: -1.7s; }
+  #page-banner .flower:nth-child(3n + 1) { animation-delay: -3.1s; animation-duration: 6s; }
+}
+
+@keyframes summer-sun {
+  from { opacity: 0.22; }
+  to { opacity: 0.38; }
+}
+
+@keyframes summer-drift {
+  from { transform: translateX(-1.6%); }
+  to { transform: translateX(1.6%); }
+}
+
+@keyframes summer-sway {
+  from { transform: rotate(-2.6deg); }
+  to { transform: rotate(2.6deg); }
+}
diff --git a/pagerite/themes/summer/banner.svg b/pagerite/themes/summer/banner.svg
new file mode 100644
index 0000000..21d1c95
--- /dev/null
+++ b/pagerite/themes/summer/banner.svg
@@ -0,0 +1,369 @@
+<svg xmlns="http://www.w3.org/2000/svg"
+     viewBox="0 0 1600 320"
+     preserveAspectRatio="xMidYMid slice">
+
+  <defs>
+    <linearGradient id="sky" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#8ed0ff"/>
+      <stop offset=".64" stop-color="#d9f1ff"/>
+      <stop offset="1" stop-color="#eef9ff"/>
+    </linearGradient>
+
+    <linearGradient id="farHill" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#b8dca7"/>
+      <stop offset="1" stop-color="#a4cf90"/>
+    </linearGradient>
+
+    <linearGradient id="nearHill" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#91c97c"/>
+      <stop offset="1" stop-color="#74b65e"/>
+    </linearGradient>
+
+    <linearGradient id="grass" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" stop-color="#69ae4b"/>
+      <stop offset="1" stop-color="#4f913b"/>
+    </linearGradient>
+
+    <!-- Soft fade into the page background (stop-color from banner.css) -->
+    <linearGradient id="meadowFade" x1="0" y1="0" x2="0" y2="1">
+      <stop offset="0" class="summer-fade" stop-color="#e6f4cf" stop-opacity="0"/>
+      <stop offset="1" class="summer-fade" stop-color="#e6f4cf"/>
+    </linearGradient>
+
+    <filter id="soft">
+      <feGaussianBlur stdDeviation="16"/>
+    </filter>
+
+    <filter id="cloudShadow" x="-20%" y="-40%" width="140%" height="180%">
+      <feDropShadow dx="0" dy="3" stdDeviation="4"
+                    flood-color="#4f8fb0" flood-opacity=".12"/>
+    </filter>
+  </defs>
+
+  <!-- Sky -->
+  <rect width="1600" height="320" fill="url(#sky)"/>
+
+  <!-- Sun (rises on scroll, glow pulses) -->
+  <circle class="sun-glow" cx="1330" cy="72" r="82"
+          fill="#fff0a2"
+          opacity=".28"
+          filter="url(#soft)"/>
+  <circle class="sun" cx="1330" cy="72" r="42"
+          fill="#fff0a2"
+          opacity=".82"/>
+
+  <!-- Clouds (drift on scroll, lazily float sideways) -->
+  <g class="clouds" fill="#fff" opacity=".82" filter="url(#cloudShadow)">
+    <g class="cloud cloud-a">
+      <g transform="translate(160 72)">
+        <ellipse cx="0" cy="12" rx="54" ry="20"/>
+        <circle cx="-27" cy="4" r="26"/>
+        <circle cx="7" cy="-6" r="34"/>
+        <circle cx="40" cy="7" r="25"/>
+      </g>
+    </g>
+
+    <g class="cloud cloud-b" opacity=".72">
+      <g transform="translate(650 52)">
+        <ellipse cx="0" cy="10" rx="45" ry="16"/>
+        <circle cx="-21" cy="4" r="21"/>
+        <circle cx="7" cy="-5" r="27"/>
+        <circle cx="32" cy="6" r="20"/>
+      </g>
+    </g>
+
+    <g class="cloud cloud-c" opacity=".58">
+      <g transform="translate(1070 110)">
+        <ellipse cx="0" cy="8" rx="38" ry="14"/>
+        <circle cx="-18" cy="3" r="18"/>
+        <circle cx="6" cy="-4" r="23"/>
+        <circle cx="28" cy="5" r="17"/>
+      </g>
+    </g>
+  </g>
+
+  <!-- Far rolling hills (slow parallax); drawn past the bottom edge so the
+       drift never exposes sky underneath -->
+  <path class="hills-far" d="
+    M0 211
+    C145 170 263 173 390 211
+    C516 249 616 237 730 194
+    C846 151 945 168 1065 208
+    C1195 251 1334 214 1600 171
+    L1600 340
+    L0 340
+    Z"
+    fill="url(#farHill)"/>
+
+  <!-- Near rolling hills -->
+  <path class="hills-near" d="
+    M0 248
+    C120 217 228 217 342 247
+    C454 278 566 269 674 228
+    C789 184 901 202 1024 243
+    C1143 282 1278 271 1391 229
+    C1473 199 1538 196 1600 207
+    L1600 340
+    L0 340
+    Z"
+    fill="url(#nearHill)"/>
+
+  <!-- Proper leafy bushes (ride with the near hills) -->
+  <g class="hills-near">
+    <g transform="translate(130 236)">
+      <path d="
+        M-58 28
+        C-61 7 -46 -5 -28 0
+        C-28 -20 -4 -31 11 -16
+        C22 -36 54 -27 53 -5
+        C73 -10 90 6 85 27
+        Z"
+        fill="#5e9c4b"/>
+      <path d="
+        M-47 27
+        C-48 10 -37 1 -23 5
+        C-20 -10 -4 -17 8 -7
+        C19 -21 40 -17 43 -1
+        C60 -4 70 8 68 26
+        Z"
+        fill="#70ad58"/>
+    </g>
+
+    <g transform="translate(1240 225) scale(.9)">
+      <path d="
+        M-58 28
+        C-61 7 -46 -5 -28 0
+        C-28 -20 -4 -31 11 -16
+        C22 -36 54 -27 53 -5
+        C73 -10 90 6 85 27
+        Z"
+        fill="#5e9c4b"/>
+      <path d="
+        M-47 27
+        C-48 10 -37 1 -23 5
+        C-20 -10 -4 -17 8 -7
+        C19 -21 40 -17 43 -1
+        C60 -4 70 8 68 26
+        Z"
+        fill="#70ad58"/>
+    </g>
+
+    <g transform="translate(460 250) scale(.58)">
+      <path d="
+        M-58 28
+        C-61 7 -46 -5 -28 0
+        C-28 -20 -4 -31 11 -16
+        C22 -36 54 -27 53 -5
+        C73 -10 90 6 85 27
+        Z"
+        fill="#5a9748"/>
+    </g>
+
+    <g transform="translate(940 245) scale(.55)">
+      <path d="
+        M-58 28
+        C-61 7 -46 -5 -28 0
+        C-28 -20 -4 -31 11 -16
+        C22 -36 54 -27 53 -5
+        C73 -10 90 6 85 27
+        Z"
+        fill="#5a9748"/>
+    </g>
+  </g>
+
+  <!-- Foreground meadow (near-static parallax) -->
+  <path class="meadow" d="
+    M0 270
+    C95 260 175 267 260 273
+    C347 279 431 265 521 262
+    C620 258 705 275 808 272
+    C914 269 1004 251 1115 258
+    C1229 265 1324 279 1424 270
+    C1491 264 1547 258 1600 262
+    L1600 340
+    L0 340
+    Z"
+    fill="url(#grass)"/>
+
+  <!-- Dense grass blades -->
+  <g class="meadow" fill="none"
+     stroke="#4b8937"
+     stroke-width="2.5"
+     stroke-linecap="round">
+
+    <path d="M20 276 q-2 -19 4 -31 M28 276 q8 -18 11 -29"/>
+    <path d="M65 272 q-5 -18 1 -28 M74 272 q8 -16 11 -25"/>
+    <path d="M110 271 q-2 -23 5 -36 M121 272 q9 -18 12 -30"/>
+    <path d="M165 273 q-6 -16 -1 -28 M175 273 q7 -18 11 -27"/>
+    <path d="M225 274 q-3 -24 4 -37 M236 274 q8 -17 12 -29"/>
+    <path d="M286 273 q-6 -19 -1 -31 M296 274 q9 -18 12 -28"/>
+    <path d="M345 270 q-3 -18 3 -31 M355 270 q8 -17 12 -28"/>
+    <path d="M405 266 q-4 -22 2 -35 M416 266 q9 -17 13 -28"/>
+    <path d="M472 263 q-3 -18 3 -30 M482 263 q8 -19 13 -29"/>
+    <path d="M535 263 q-6 -19 -1 -31 M546 264 q9 -19 13 -30"/>
+    <path d="M598 266 q-3 -24 4 -37 M609 267 q8 -19 12 -31"/>
+    <path d="M665 271 q-6 -17 -1 -29 M676 271 q9 -17 13 -28"/>
+    <path d="M735 273 q-4 -22 3 -34 M746 273 q8 -18 12 -29"/>
+    <path d="M805 272 q-6 -18 -1 -30 M816 271 q9 -17 13 -27"/>
+    <path d="M875 265 q-3 -23 4 -35 M886 265 q8 -18 12 -28"/>
+    <path d="M945 258 q-5 -18 1 -30 M955 258 q9 -17 12 -28"/>
+    <path d="M1018 256 q-3 -22 4 -34 M1029 256 q8 -18 12 -28"/>
+    <path d="M1090 259 q-5 -20 1 -31 M1101 259 q8 -18 12 -29"/>
+    <path d="M1162 264 q-3 -24 4 -36 M1173 264 q8 -18 12 -30"/>
+    <path d="M1234 269 q-5 -19 1 -31 M1245 269 q8 -17 12 -28"/>
+    <path d="M1304 273 q-3 -23 4 -35 M1315 273 q8 -18 12 -29"/>
+    <path d="M1374 272 q-5 -18 1 -29 M1385 272 q8 -18 12 -28"/>
+    <path d="M1445 268 q-3 -22 4 -34 M1456 268 q8 -17 12 -28"/>
+    <path d="M1515 264 q-5 -20 1 -31 M1526 264 q8 -18 12 -29"/>
+    <path d="M1570 263 q-3 -21 4 -33 M1581 263 q8 -17 12 -28"/>
+  </g>
+
+  <!-- Extra foreground tufts -->
+  <g class="meadow" fill="#579a40">
+    <path d="M80 320 l15 -45 3 45 14 -57 0 57 20 -38 -7 38z"/>
+    <path d="M365 320 l10 -37 5 37 15 -49 -2 49 20 -34 -7 34z"/>
+    <path d="M710 320 l13 -42 3 42 15 -54 -1 54 20 -38 -8 38z"/>
+    <path d="M1040 320 l10 -35 5 35 14 -49 0 49 18 -32 -6 32z"/>
+    <path d="M1360 320 l13 -43 3 43 16 -55 -2 55 20 -37 -7 37z"/>
+  </g>
+
+  <!-- Flowers (sway gently; each wrapped in a classed group so the CSS
+       transform doesn't clobber the placement transform) -->
+  <g class="meadow">
+    <g class="flower">
+      <g transform="translate(190 270)">
+        <path d="M0 8 Q-2 25 -4 42" stroke="#42833a" stroke-width="2" fill="none"/>
+        <g fill="#ff8aa7">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ffe071"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(310 280) scale(.8)">
+        <path d="M0 8 Q2 23 1 37" stroke="#42833a" stroke-width="2" fill="none"/>
+        <g fill="#fff0a0">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ef7191"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(540 265)">
+        <path d="M0 8 Q-2 25 -2 42" stroke="#42833a" stroke-width="2" fill="none"/>
+        <g fill="#ff8aa7">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ffe071"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(670 279) scale(.7)">
+        <g fill="#fff0a0">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ef7191"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(845 272)">
+        <path d="M0 8 Q2 25 0 42" stroke="#42833a" stroke-width="2" fill="none"/>
+        <g fill="#ff8aa7">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ffe071"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(1010 265) scale(.85)">
+        <path d="M0 8 Q-2 24 -1 38" stroke="#42833a" stroke-width="2" fill="none"/>
+        <g fill="#fff0a0">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ef7191"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(1190 275)">
+        <g fill="#ff8aa7">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ffe071"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(1410 269)">
+        <path d="M0 8 Q2 26 0 42" stroke="#42833a" stroke-width="2" fill="none"/>
+        <g fill="#fff0a0">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ef7191"/>
+      </g>
+    </g>
+
+    <g class="flower">
+      <g transform="translate(1510 282) scale(.72)">
+        <g fill="#ff8aa7">
+          <circle cx="-5" cy="0" r="5"/>
+          <circle cx="5" cy="0" r="5"/>
+          <circle cx="0" cy="-5" r="5"/>
+          <circle cx="0" cy="5" r="5"/>
+        </g>
+        <circle r="3" fill="#ffe071"/>
+      </g>
+    </g>
+  </g>
+
+  <!-- Small scattered meadow dots -->
+  <g class="meadow" fill="#ffe071" opacity=".9">
+    <circle cx="250" cy="287" r="2.5"/>
+    <circle cx="445" cy="281" r="2.5"/>
+    <circle cx="615" cy="289" r="2.5"/>
+    <circle cx="760" cy="283" r="2.5"/>
+    <circle cx="930" cy="279" r="2.5"/>
+    <circle cx="1125" cy="287" r="2.5"/>
+    <circle cx="1290" cy="281" r="2.5"/>
+  </g>
+
+  <g class="meadow" fill="#ff8aa7" opacity=".8">
+    <circle cx="120" cy="291" r="2.5"/>
+    <circle cx="395" cy="291" r="2.5"/>
+    <circle cx="730" cy="294" r="2.5"/>
+    <circle cx="1080" cy="294" r="2.5"/>
+    <circle cx="1460" cy="291" r="2.5"/>
+  </g>
+
+  <!-- Soft fade into the page background -->
+  <rect y="252" width="1600" height="68" fill="url(#meadowFade)"/>
+</svg>
diff --git a/pagerite/themes/summer/grass.svg b/pagerite/themes/summer/grass.svg
new file mode 100644
index 0000000..f57ec8a
--- /dev/null
+++ b/pagerite/themes/summer/grass.svg
@@ -0,0 +1,143 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="300" height="9" viewBox="0 0 300 9">
+<g fill="none" stroke-linecap="round">
+  <path d="M1.0 9 q2.0 -3.0 1.5 -5.5" stroke="#579a40" stroke-width="1.0"/>
+  <path d="M3.5 9 q1.7 -4.1 3.0 -7.5" stroke="#579a40" stroke-width="1.6"/>
+  <path d="M6.3 9 q-2.0 -3.8 -1.8 -6.9" stroke="#63ad4d" stroke-width="0.8"/>
+  <path d="M8.4 9 q-1.7 -2.3 -3.1 -4.2" stroke="#74b65e" stroke-width="1.2"/>
+  <path d="M11.0 9 q0.6 -3.5 1.8 -6.3" stroke="#4f913b" stroke-width="1.3"/>
+  <path d="M12.7 9 q-0.4 -2.6 -1.9 -4.8" stroke="#63ad4d" stroke-width="0.8"/>
+  <path d="M14.3 9 q-2.3 -2.9 2.5 -5.3" stroke="#4f913b" stroke-width="1.4"/>
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+  <path d="M255.5 9 q1.4 -2.2 -2.9 -4.0" stroke="#4f913b" stroke-width="1.4"/>
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+  <path d="M269.4 9 q-1.8 -1.9 -3.9 -3.5" stroke="#579a40" stroke-width="1.5"/>
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+  <path d="M282.5 9 q0.6 -3.5 1.2 -6.3" stroke="#4f913b" stroke-width="1.2"/>
+  <path d="M284.0 9 q-2.4 -3.8 -2.5 -6.8" stroke="#74b65e" stroke-width="1.5"/>
+  <path d="M285.6 9 q-1.6 -5.2 -2.4 -9.4" stroke="#63ad4d" stroke-width="1.5"/>
+  <path d="M288.4 9 q1.6 -2.4 3.1 -4.4" stroke="#63ad4d" stroke-width="1.2"/>
+  <path d="M290.2 9 q-1.9 -3.0 2.9 -5.4" stroke="#63ad4d" stroke-width="0.8"/>
+  <path d="M291.6 9 q-0.5 -2.7 -2.1 -4.9" stroke="#579a40" stroke-width="1.8"/>
+  <path d="M294.2 9 q0.8 -3.7 4.4 -6.7" stroke="#63ad4d" stroke-width="0.9"/>
+  <path d="M296.6 9 q1.2 -3.7 4.2 -6.7" stroke="#74b65e" stroke-width="0.9"/>
+  <path d="M298.1 9 q1.0 -3.8 3.9 -7.0" stroke="#42833a" stroke-width="0.8"/>
+</g>
+</svg>
diff --git a/pagerite/themes/summer/theme.css b/pagerite/themes/summer/theme.css
new file mode 100644
index 0000000..67a425b
--- /dev/null
+++ b/pagerite/themes/summer/theme.css
@@ -0,0 +1,262 @@
+/* Summer theme: the banner's illustrated meadow carried through the whole
+   page — one palette (sky blue, grass green, sun yellow, flower pink),
+   soft daylight surfaces, and playful touches like a tilted brand and
+   flower bullets. */
+
+:root {
+  color-scheme: light;
+
+  /* Every color is sampled (or text-darkened) from banner.svg. */
+  --bg: #e6f4cf;
+  /* pale meadow — the banner fades into this */
+  --surface: #f8fbf0;
+  --text: #2c4a2f;
+  /* deep leaf */
+  --muted: #5c7a5e;
+
+  --accent: #2598d6;
+  /* sky, darkened for text contrast */
+  --accent2: #4f913b;
+  /* grass */
+  --accent3: #e95f83;
+  /* flower pink, darkened for text contrast */
+  --sun: #ffe071;
+  --line: #4f913b29;
+
+  --link: color-mix(in oklab, var(--text) 38%, var(--accent));
+
+  --font-body: var(--font-cause);
+  --font-heading: var(--font-new-rocker);
+  --font-brand: var(--font-cause);
+}
+
+/* The page is the same landscape the banner paints: hazy sky light up top
+   (with an echo of the banner's sun in the top-right corner) settling into
+   a pale meadow below. Fixed, so the banner parallax reads against a
+   still backdrop. */
+body {
+  background:
+    radial-gradient(ellipse 36rem 24rem at 85% -6rem,
+      #fff0a299 0,
+      #fff0a63d 45%,
+      transparent 70%),
+    radial-gradient(ellipse 42rem 26rem at 6% 2rem,
+      #8ed0ff4d 0,
+      transparent 70%),
+    radial-gradient(ellipse 30rem 22rem at 96% 62%,
+      #ff8aa726 0,
+      transparent 70%),
+    linear-gradient(180deg,
+      var(--bg) 0,
+      #d9eebd 24rem,
+      #c6e5a8 55rem,
+      #b8dd9c 100%);
+  background-attachment: fixed;
+
+  color: var(--text);
+}
+
+::selection {
+  background: var(--sun);
+  color: #3d5223;
+}
+
+/* The banner frame ties into the meadow beneath it. */
+#banner {
+  border-bottom-color: #4f913b30;
+  box-shadow: 0 0.3rem 1rem #4f913b22;
+}
+
+/* Cheerful oversized tilted brand in a sky→grass→flower gradient. */
+#brand {
+  font-size: clamp(3.2rem, 9vw, 7.5rem);
+  line-height: 1;
+  padding-bottom: 0.3em;
+  margin-bottom: -0.3em;
+
+  transform: rotate(-2deg);
+  transform-origin: left bottom;
+
+  background: linear-gradient(100deg,
+      var(--accent) 0 30%,
+      var(--accent2) 55%,
+      var(--accent3) 95%);
+  -webkit-background-clip: text;
+  background-clip: text;
+  color: transparent;
+  text-shadow: none;
+
+  filter:
+    drop-shadow(0 1px 0 #fff) drop-shadow(0 0.15rem 0.15rem #ffffff99) drop-shadow(0 0.3rem 0.4rem #4f913b33);
+}
+
+/* Navigation floats over the artwork: dark leaf text with a daylight halo. */
+#nav {
+  color: #24452d;
+  text-shadow:
+    0 1px #ffffff,
+    0 0 0.2em #ffffff,
+    0 0 0.5em #d9f1ff;
+}
+
+#nav a {
+  color: #2c4a2f;
+}
+
+#nav ul ul a,
+#nav span {
+  color: #527048;
+}
+
+#nav a:hover,
+#nav .current {
+  color: var(--accent);
+}
+
+/* Content sits in a soft wash of sunlit meadow rather than on a white
+   card. */
+main {
+  background: linear-gradient(90deg,
+      transparent,
+      #f0f8dc80 15%,
+      #f0f8dc8c 50%,
+      #f0f8dc80 85%,
+      transparent);
+}
+
+/* The sidebar is a piece of the same meadow: glassy green with a light
+   top edge and a grassy shadow. */
+#sidebar {
+  background: linear-gradient(160deg, #f4faddd9, #d9eec5cf);
+  border-right: 1px solid #ffffff80;
+  border-bottom: 1px solid var(--line);
+  box-shadow: 0 0.3rem 1rem #4f913b1f;
+}
+
+#sidebar a {
+  color: #527048;
+}
+
+#sidebar a:hover,
+#sidebar .current {
+  color: var(--accent);
+}
+
+/* One accent per heading level: sky h1 growing a dense low strip of grass
+   right against its baseline (grass.svg, ~140 varied blades per tile,
+   served by the backend next to this stylesheet), grass h2, flower h3 in
+   a quieter weight. */
+article h1 {
+  color: var(--accent);
+  width: fit-content;
+  padding-bottom: 0.12em;
+  text-shadow: 0 1px #ffffffaa;
+  background: url("grass.svg") bottom left / auto 0.35em repeat-x;
+}
+
+article h2 {
+  color: var(--accent2);
+  text-shadow: 0 1px #ffffff88;
+}
+
+article h3 {
+  color: var(--accent3);
+  font-weight: 550;
+}
+
+article a {
+  color: var(--link);
+}
+
+article a:hover {
+  color: var(--accent);
+}
+
+/* Flower bullets, one accent per nesting level. */
+article ul li::before {
+  content: "❀";
+  color: var(--accent3);
+  font-size: 0.8em;
+  vertical-align: 0.1em;
+}
+
+article ul ul li::before {
+  content: "✿";
+  color: var(--accent);
+}
+
+article ul ul ul li::before {
+  content: "❁";
+  color: var(--accent2);
+}
+
+/* Quotes get a grassy edge and a wash of sunlight. */
+blockquote {
+  color: #4d6849;
+  border-left-color: var(--accent2);
+  background: linear-gradient(90deg, #fff0a238, transparent 70%);
+  padding-top: 0.25rem;
+  padding-bottom: 0.25rem;
+}
+
+/* Code rests on a shaded leaf panel, keeping the base light syntax
+   palette. */
+pre {
+  --code-bg: #e7f1d6;
+
+  background: linear-gradient(160deg, #f0f7e2, #ddebc9);
+  border: 1px solid var(--line);
+  box-shadow:
+    inset 0 1px #ffffff99,
+    0 0.2rem 0.6rem #4f913b1a;
+}
+
+.copy {
+  background: linear-gradient(180deg, #f6faec, #e2efcf);
+  border-color: var(--line);
+}
+
+/* Tables: a rounded piece of the landscape. The base's header-gradient
+   hooks get sky→grass colors and the cell wash tints green; soft corners
+   and a grassy shadow replace the old hard grid. */
+table {
+  --table-head-a: #fdfccd88;
+  --table-head-b: #ece9ba88;
+  --table-tint: var(--accent2);
+
+  border-collapse: separate;
+  border-spacing: 0;
+  border-radius: 0.7rem;
+  overflow: clip;
+  box-shadow: 0 0.1rem 0.5rem #4f913b88;
+}
+
+th {
+  color: #2c4a2f;
+}
+
+/* A sun-kissed sheen on hover, fading in over the cell wash. */
+tbody td {
+  transition: background-color 0.2s;
+}
+
+tbody tr:hover td {
+  background-color: #fff0a238;
+}
+
+figcaption,
+.dateline,
+.footnote {
+  color: var(--muted);
+}
+
+/* Editor chrome inherits the meadow rather than the base white. */
+.editor-root.overlay {
+  background: linear-gradient(160deg, #eef7dd, #d9eec5);
+}
+
+/* The page transition exposes summer color around the rotating
+   snapshots. */
+::view-transition {
+  background: var(--bg);
+}