diff --git a/adventskalender/2025/content/day01.html b/adventskalender/2025/content/day01.html
index e964bbd..5e62527 100644
--- a/adventskalender/2025/content/day01.html
+++ b/adventskalender/2025/content/day01.html
@@ -1,6 +1,6 @@
-<section class="popup-day dayXX">
+<section class="popup-day day01">
 
-  <h3>🎁 Türchen XX</h3>
+  <h3>🎁 Türchen 01</h3>
 
   <!-- === Basisbild (Platzhalter oder Hauptmotiv) === -->
   <div class="image-wrapper">
@@ -46,7 +46,7 @@
           /2025/assets/images/2560/jpeg/Basisbild.jpeg 2560w,
           /2025/assets/images/3840/jpeg/Basisbild.jpeg 3840w"
         sizes="100vw"
-        alt="Bratonien Adventskalender – Tag XX"
+        alt="Bratonien Adventskalender – Tag 01"
         decoding="async">
     </picture>
   </div>
@@ -64,24 +64,24 @@
       poster="/2025/assets/images/1366/jpeg/Basisbild.jpeg"
     >
       <!-- WEBM-Varianten -->
-      <source src="/2025/assets/videos/nHD/XX.webm"       type="video/webm" media="(max-width: 640px)">
-      <source src="/2025/assets/videos/FWVGA/XX.webm"     type="video/webm" media="(max-width: 854px)">
-      <source src="/2025/assets/videos/qHD/XX.webm"       type="video/webm" media="(max-width: 960px)">
-      <source src="/2025/assets/videos/HD/XX.webm"        type="video/webm" media="(max-width: 1280px)">
-      <source src="/2025/assets/videos/HDplus/XX.webm"    type="video/webm" media="(max-width: 1600px)">
-      <source src="/2025/assets/videos/FullHD/XX.webm"    type="video/webm" media="(max-width: 1920px)">
-      <source src="/2025/assets/videos/1440p/XX.webm"     type="video/webm" media="(max-width: 2560px)">
-      <source src="/2025/assets/videos/4K/XX.webm"        type="video/webm" media="(min-width: 2561px)">
+      <source src="/2025/assets/videos/nHD/01.webm"       type="video/webm" media="(max-width: 640px)">
+      <source src="/2025/assets/videos/FWVGA/01.webm"     type="video/webm" media="(max-width: 854px)">
+      <source src="/2025/assets/videos/qHD/01.webm"       type="video/webm" media="(max-width: 960px)">
+      <source src="/2025/assets/videos/HD/01.webm"        type="video/webm" media="(max-width: 1280px)">
+      <source src="/2025/assets/videos/HDplus/01.webm"    type="video/webm" media="(max-width: 1600px)">
+      <source src="/2025/assets/videos/FullHD/01.webm"    type="video/webm" media="(max-width: 1920px)">
+      <source src="/2025/assets/videos/1440p/01.webm"     type="video/webm" media="(max-width: 2560px)">
+      <source src="/2025/assets/videos/4K/01.webm"        type="video/webm" media="(min-width: 2561px)">
 
       <!-- MP4-Fallbacks -->
-      <source src="/2025/assets/videos/nHD/XX.mp4"        type="video/mp4" media="(max-width: 640px)">
-      <source src="/2025/assets/videos/FWVGA/XX.mp4"      type="video/mp4" media="(max-width: 854px)">
-      <source src="/2025/assets/videos/qHD/XX.mp4"        type="video/mp4" media="(max-width: 960px)">
-      <source src="/2025/assets/videos/HD/XX.mp4"         type="video/mp4" media="(max-width: 1280px)">
-      <source src="/2025/assets/videos/HDplus/XX.mp4"     type="video/mp4" media="(max-width: 1600px)">
-      <source src="/2025/assets/videos/FullHD/XX.mp4"     type="video/mp4" media="(max-width: 1920px)">
-      <source src="/2025/assets/videos/1440p/XX.mp4"      type="video/mp4" media="(max-width: 2560px)">
-      <source src="/2025/assets/videos/4K/XX.mp4"         type="video/mp4" media="(min-width: 2561px)">
+      <source src="/2025/assets/videos/nHD/01.mp4"        type="video/mp4" media="(max-width: 640px)">
+      <source src="/2025/assets/videos/FWVGA/01.mp4"      type="video/mp4" media="(max-width: 854px)">
+      <source src="/2025/assets/videos/qHD/01.mp4"        type="video/mp4" media="(max-width: 960px)">
+      <source src="/2025/assets/videos/HD/01.mp4"         type="video/mp4" media="(max-width: 1280px)">
+      <source src="/2025/assets/videos/HDplus/01.mp4"     type="video/mp4" media="(max-width: 1600px)">
+      <source src="/2025/assets/videos/FullHD/01.mp4"     type="video/mp4" media="(max-width: 1920px)">
+      <source src="/2025/assets/videos/1440p/01.mp4"      type="video/mp4" media="(max-width: 2560px)">
+      <source src="/2025/assets/videos/4K/01.mp4"         type="video/mp4" media="(min-width: 2561px)">
 
       Dein Browser unterstützt dieses Videoformat nicht.
     </video>
@@ -90,7 +90,7 @@
 
   <!-- === Hintergrundmusik (optional) === -->
   <audio id="bgmusic" autoplay loop>
-    <source src="/2025/assets/audio/dayXX_theme.mp3" type="audio/mpeg">
+    <source src="/2025/assets/audio/day01_theme.mp3" type="audio/mpeg">
   </audio>
 
 </section>
\ No newline at end of file
diff --git a/adventskalender/2025/css/day.css b/adventskalender/2025/css/day.css
new file mode 100644
index 0000000..9b0c46e
--- /dev/null
+++ b/adventskalender/2025/css/day.css
@@ -0,0 +1,122 @@
+/* Bratonien Adventskalender 2025 – day.css
+   Voll responsive Darstellung der Türcheninhalte
+*/
+
+/* === POPUP-BASIS === */
+.popup-day {
+  width: 100%;
+  max-width: clamp(320px, 85vw, 1800px);
+  margin: 0 auto;
+  padding: clamp(1rem, 2vw, 3rem);
+  text-align: center;
+  color: var(--ci-darkgreen);
+  font-family: "Bratonien2025", cursive;
+  box-sizing: border-box;
+}
+
+.popup-day h3 {
+  font-size: clamp(1.2rem, 2vw, 2.2rem);
+  color: var(--ci-gold);
+  margin-bottom: clamp(1rem, 2vw, 2rem);
+  letter-spacing: 0.05em;
+  text-shadow:
+    0 0 4px rgba(0, 0, 0, 0.4),
+    0 0 8px rgba(0, 0, 0, 0.3);
+}
+
+/* === BILDER === */
+.image-wrapper {
+  position: relative;
+  width: 100%;
+  margin: 0 auto clamp(1.2rem, 2vw, 2.5rem);
+  overflow: hidden;
+  border-radius: 12px;
+  box-shadow:
+    0 0 12px rgba(0, 0, 0, 0.25),
+    0 0 20px color-mix(in srgb, var(--ci-gold) 25%, transparent);
+}
+
+.image-wrapper picture,
+.image-wrapper img {
+  width: 100%;
+  height: auto;
+  display: block;
+  object-fit: cover;
+}
+
+/* === VIDEOS === */
+.video-wrapper {
+  position: relative;
+  width: 100%;
+  max-width: 100%;
+  margin: 0 auto clamp(1rem, 2vw, 2rem);
+  background: #000;
+  border-radius: 12px;
+  overflow: hidden;
+  box-shadow:
+    0 0 16px rgba(0, 0, 0, 0.4),
+    0 0 24px color-mix(in srgb, var(--ci-blue) 20%, transparent);
+}
+
+/* verhindert Layoutsprung beim Laden */
+.video-wrapper::before {
+  content: "";
+  display: block;
+  padding-top: 56.25%; /* 16:9 */
+}
+
+.video-wrapper video {
+  position: absolute;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  border: none;
+  outline: none;
+  object-fit: cover;
+  border-radius: 12px;
+}
+
+/* === AUDIO === */
+audio {
+  display: none;
+}
+
+/* === RESPONSIVE FEINANPASSUNG === */
+
+/* Smartphones (bis ca. 480 px) */
+@media (max-width: 480px) {
+  .popup-day {
+    padding: 1rem 0.5rem 1.5rem;
+  }
+
+  .popup-day h3 {
+    font-size: 1.1rem;
+  }
+}
+
+/* Tablets & kleine Laptops (768 px – 1366 px) */
+@media (min-width: 768px) and (max-width: 1366px) {
+  .popup-day {
+    max-width: 90vw;
+  }
+}
+
+/* Große Monitore (ab 1600 px) */
+@media (min-width: 1600px) {
+  .popup-day {
+    max-width: 70vw;
+  }
+}
+
+/* Ultrawide / 4K */
+@media (min-width: 2560px) {
+  .popup-day {
+    max-width: 65vw;
+    padding: 3rem 2rem 4rem;
+  }
+
+  .popup-day h3 {
+    font-size: 2.4rem;
+  }
+}
\ No newline at end of file