diff --git a/app/static/css/style.css b/app/static/css/style.css
index 5696c1b..9593222 100755
--- a/app/static/css/style.css
+++ b/app/static/css/style.css
@@ -252,237 +252,102 @@ body {
    - Clean Inner Letter Sheet
    ========================================= */
 
-.envelope-outer-wrap {
-    width: 100%;
-    max-width: 480px;
-    margin: 15px auto 25px;
-}
+/* =========================================
+   CODEPEN POCKET GEOMETRY + MAJESTIC SLIDE-OUT ANIMATION
+   - Real 4-Flap Envelope Fold Geometry (from CodePen)
+   - Left, Right, Bottom and Top Flaps meeting at Center (50% 50%)
+   - Authentic Hogwarts Wax Seal in the Exact Mitte
+   - Subtle Handwriting Return Address (Top-Left)
+   - Clean Inner Letter Sheet (No Text Walls)
+   - Majestic Rise-Out Opening Animation with Space Creation
+   ========================================= */
 
-.envelope-form {
-    width: 100%;
-    perspective: 1200px;
-}
-
-.env-wrap {
+.antique-envelope-scene {
     position: relative;
-    overflow: hidden;
-    width: 100%;
-    padding-top: 86%; /* Aspect ratio for envelope body + rising letter */
-    background: transparent;
+    width: min(480px, 94vw);
+    height: min(280px, 60vw);
+    margin: 25px auto 35px;
+    perspective: 1200px;
+    perspective-origin: center top;
+    transition: margin-top 0.8s cubic-bezier(0.25, 1, 0.5, 1);
 }
 
-/* Interior Back Wall of the Envelope (Bottom 55%) */
-.env-body-back {
-    position: absolute;
-    bottom: 0;
-    left: 0;
+.antique-envelope-scene.envelope-opened,
+.antique-envelope-scene:has(.envelope-opened) {
+    margin-top: 155px;
+    margin-bottom: 25px;
+}
+
+.envelope-base {
+    position: relative;
     width: 100%;
-    height: 55%;
-    background-color: #2e2014;
+    height: 100%;
+    border-radius: 6px;
+    box-shadow: 
+        0 20px 45px rgba(0, 0, 0, 0.75),
+        0 4px 14px rgba(0, 0, 0, 0.5);
+}
+
+/* Interior Back Wall of the Envelope */
+.envelope-interior {
+    position: absolute;
+    inset: 0;
+    border-radius: 6px;
+    background-color: #2b1d12;
     background-image: 
-        radial-gradient(ellipse at 50% 50%, rgba(0, 0, 0, 0.35) 0%, rgba(0, 0, 0, 0.8) 100%),
+        radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.35) 0%, rgba(0, 0, 0, 0.8) 100%),
         url('/static/img/parchment_texture.jpg');
     background-size: cover;
-    border-radius: 0 0 6px 6px;
-    border: 1.5px solid #6b4a24;
-    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.75);
+    border: 2px solid #7a5c36;
     z-index: 1;
 }
 
-/* Top V-Flap (Hinged at 45% Top Edge of Envelope Body) */
-.env-top {
+/* The Letter Sheet (Slides Up Out of the Envelope Pocket) */
+.letter-sheet {
     position: absolute;
-    width: 100%;
-    height: 33%;
-    top: 45%;
-    z-index: 8;
-    transform-origin: top center;
-    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), z-index 0s 0.25s;
-}
-
-.env-top:before {
-    content: '';
-    position: absolute;
-    width: 100%;
-    height: 100%;
-    background-color: #ebd8ae;
-    background-image: 
-        radial-gradient(ellipse at 50% 20%, rgba(255, 255, 255, 0.3) 0%, rgba(130, 95, 45, 0.2) 100%),
-        url('/static/img/parchment_texture.jpg');
-    background-size: cover;
-    clip-path: polygon(50% 100%, 0 0, 100% 0);
-    filter: drop-shadow(0px 8px 12px rgba(35, 18, 5, 0.6));
-    border-top: 1px solid #7c5830;
-}
-
-/* Sketched Dashed Line on Top Flap */
-.env-top:after {
-    content: '';
-    position: absolute;
-    top: 2px;
+    top: 10px;
     left: 4%;
     width: 92%;
-    height: 94%;
-    clip-path: polygon(50% 96%, 2% 2%, 98% 2%);
-    border-top: 1.5px dashed rgba(110, 75, 35, 0.4);
-    pointer-events: none;
-}
-
-/* Bottom Pocket Wrap */
-.env-bottom-wrap {
-    height: 55%;
-    width: 100%;
-    z-index: 4;
-    bottom: 0;
-    position: absolute;
-    filter: drop-shadow(0px -4px 6px rgba(30, 15, 5, 0.3));
-}
-
-/* Bottom Flap */
-.env-bottom {
-    clip-path: polygon(50% 50%, 100% 0, 100% 100%, 0 100%, 0 0);
-    background-color: #e5cf9f;
+    height: 380px;
+    max-height: 65vh;
+    background-color: #f7f0df;
     background-image: 
-        radial-gradient(ellipse at 50% 80%, rgba(255, 255, 255, 0.25) 0%, rgba(120, 85, 40, 0.25) 100%),
-        url('/static/img/parchment_texture.jpg');
-    background-size: cover;
-    width: 100%;
-    height: 100%;
-    position: relative;
-    border-radius: 0 0 6px 6px;
-}
-
-/* Side Flaps Inside Bottom Pocket */
-.env-bottom:before, .env-bottom:after {
-    content: '';
-    position: absolute;
-    width: 50%;
-    height: 100%;
-    background-size: cover;
-}
-
-/* Left Side Flap */
-.env-bottom:before {
-    left: 0;
-    clip-path: polygon(100% 50%, 0 0, 0 100%);
-    background-color: #dfc794;
-    background-image: 
-        linear-gradient(135deg, rgba(0, 0, 0, 0.12) 0%, rgba(255, 255, 255, 0.15) 100%),
-        url('/static/img/parchment_texture.jpg');
-    box-shadow: inset -2px 0 6px rgba(60, 40, 15, 0.2);
-}
-
-/* Right Side Flap */
-.env-bottom:after {
-    right: 0;
-    clip-path: polygon(0 50%, 100% 0, 100% 100%);
-    background-color: #dbc38f;
-    background-image: 
-        linear-gradient(-135deg, rgba(0, 0, 0, 0.12) 0%, rgba(255, 255, 255, 0.15) 100%),
-        url('/static/img/parchment_texture.jpg');
-    box-shadow: inset 2px 0 6px rgba(60, 40, 15, 0.2);
-}
-
-/* Small Handwriting Return Address in Top Left ("Abs.: Hogwarts Schule...") */
-.env-sender-line {
-    position: absolute;
-    top: 47%;
-    left: 14px;
-    font-family: 'Caveat', 'Marck Script', cursive;
-    font-size: clamp(0.76rem, 2.1vw, 0.88rem);
-    color: #0d3820; /* Authentic Hogwarts Emerald Ink */
-    font-weight: 600;
-    z-index: 7;
-    pointer-events: none;
-    letter-spacing: 0.2px;
-    text-shadow: 0 0 1px rgba(13, 56, 32, 0.25);
-    transition: opacity 0.4s ease;
-    white-space: nowrap;
-}
-
-/* Hand-Sketched Hogwarts Wax Seal in the Exact Mitte (Center) */
-.sketched-wax-seal {
-    position: absolute;
-    top: 72.5%; /* Exact point where top flap and pocket meet */
-    left: 50%;
-    transform: translate(-50%, -50%) rotate(-3deg);
-    width: 68px;
-    height: 68px;
-    border-radius: 50%;
-    cursor: pointer;
-    z-index: 9;
-    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease, opacity 0.4s ease;
-    box-shadow: 
-        0 8px 20px rgba(0, 0, 0, 0.75),
-        0 2px 5px rgba(0, 0, 0, 0.5);
-}
-
-.sketched-wax-seal:hover {
-    transform: translate(-50%, -50%) rotate(0deg) scale(1.1);
-    box-shadow: 
-        0 12px 26px rgba(0, 0, 0, 0.85),
-        0 0 16px rgba(218, 165, 32, 0.5);
-}
-
-.seal-crest-img {
-    width: 100%;
-    height: 100%;
-    border-radius: 50%;
-    object-fit: cover;
-    display: block;
-    border: 2.5px solid #4a0d0d;
-    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.7);
-}
-
-.seal-emboss-ring {
-    position: absolute;
-    inset: 2px;
-    border-radius: 50%;
-    border: 1.5px solid rgba(255, 215, 0, 0.25);
-    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.2), inset 0 -3px 6px rgba(0, 0, 0, 0.6);
-    pointer-events: none;
-}
-
-.seal-glow {
-    position: absolute;
-    inset: -6px;
-    border-radius: 50%;
-    background: radial-gradient(circle, rgba(255, 215, 0, 0.35) 0%, transparent 70%);
-    opacity: 0;
-    transition: opacity 0.3s ease;
-    pointer-events: none;
-}
-
-.sketched-wax-seal:hover .seal-glow {
-    opacity: 1;
-}
-
-/* Inner Letter Sheet (Clean, No Distracting Text - "Den Text lassen wir erstmal weg") */
-.env-letter-sheet {
-    width: calc(100% - 2.5rem);
-    left: 1.25rem;
-    position: absolute;
-    height: 68%;
-    top: 46%; /* Tucked safely inside pocket when closed */
-    background-color: #f7f0de;
-    background-image: 
-        radial-gradient(ellipse at 50% 30%, rgba(255, 255, 255, 0.7) 0%, rgba(140, 100, 50, 0.15) 100%),
+        radial-gradient(ellipse at 50% 25%, rgba(255, 255, 255, 0.6) 0%, rgba(140, 100, 50, 0.15) 100%),
         url('/static/img/parchment_texture.jpg');
     background-size: cover;
+    background-position: center;
     border-radius: 5px;
-    border: 1px solid #8e6c43;
+    border: 1.5px solid #8e6c43;
     outline: 1px dashed rgba(130, 95, 55, 0.4);
     outline-offset: -5px;
-    z-index: 3; /* Behind bottom pocket (z-index: 4), in front of interior back (z-index: 1) */
-    transition: transform 0.7s cubic-bezier(0.2, 0.85, 0.25, 1) 0.15s, box-shadow 0.6s ease;
-    transform: translateY(0);
+    padding: 16px 20px;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
+    z-index: 3;
+    /* Closed state: tucked completely inside the pocket, hidden */
+    visibility: hidden;
+    opacity: 0;
+    transform: translateY(40px) scale(0.92);
+    pointer-events: none;
+    transition: transform 0.85s cubic-bezier(0.2, 0.85, 0.25, 1) 0.3s, 
+                opacity 0.5s ease 0.3s, 
+                visibility 0.5s ease 0.3s,
+                box-shadow 0.8s ease;
     display: flex;
     flex-direction: column;
     align-items: center;
     justify-content: center;
-    padding: 16px 20px;
     text-align: center;
-    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+}
+
+.envelope-opened .letter-sheet {
+    visibility: visible;
+    opacity: 1;
+    pointer-events: auto;
+    transform: translateY(-145px) scale(1.02);
+    z-index: 10;
+    box-shadow: 
+        0 24px 60px rgba(0, 0, 0, 0.85),
+        0 0 35px rgba(201, 168, 106, 0.4);
 }
 
 .letter-crest-small {
@@ -535,38 +400,192 @@ body {
     color: #ffffff;
 }
 
-/* =========================================
-   OPENED STATE (via .envelope-opened class OR hover)
-   ========================================= */
-
-.envelope-opened .env-top,
-.envelope-form:hover .env-top {
-    transform: rotateX(-180deg);
-    z-index: 2;
-    transition-delay: 0s;
+/* Top V-Flap (Folds Down from Top Edge to Apex at 54%) */
+.env-top-flap {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    z-index: 18;
+    transform-origin: top center;
+    transform-style: preserve-3d;
+    clip-path: polygon(50% 54%, 0 0, 100% 0);
+    background-color: #ebd8ae;
+    background-image: 
+        radial-gradient(ellipse at 50% 20%, rgba(255, 255, 255, 0.35) 0%, rgba(130, 95, 45, 0.25) 100%),
+        url('/static/img/parchment_texture.jpg');
+    background-size: cover;
+    border-top: 2px solid #7c5830;
+    filter: drop-shadow(0 8px 14px rgba(35, 18, 5, 0.65));
+    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1), z-index 0s 0.35s;
 }
 
-.envelope-opened .sketched-wax-seal {
-    opacity: 0;
-    transform: translate(-50%, -50%) scale(0.3) rotate(25deg);
+.envelope-opened .env-top-flap {
+    transform: rotateX(180deg);
+    z-index: 2;
+    filter: drop-shadow(0 -4px 6px rgba(50, 35, 10, 0.4));
+}
+
+.env-top-sketch-line {
+    position: absolute;
+    top: 3px;
+    left: 3%;
+    width: 94%;
+    height: 94%;
+    clip-path: polygon(50% 51%, 2% 2%, 98% 2%);
+    border-top: 1.5px dashed rgba(110, 75, 35, 0.45);
     pointer-events: none;
 }
 
-.envelope-form:hover .sketched-wax-seal {
-    opacity: 0.2;
-    transform: translate(-50%, -50%) scale(0.85);
+/* CodePen Envelope Pocket (Meeting at Exact Center 50% 50%) */
+.envelope-pocket {
+    position: absolute;
+    inset: 0;
+    z-index: 14;
+    pointer-events: none;
+    border-radius: 6px;
+    overflow: hidden;
+    border-bottom: 2px solid #7c5830;
+    border-left: 2px solid #7c5830;
+    border-right: 2px solid #7c5830;
 }
 
-.envelope-opened .env-letter-sheet,
-.envelope-form:hover .env-letter-sheet {
-    transform: translateY(-56%);
-    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.8), 0 0 25px rgba(218, 165, 32, 0.35);
+.envelope-pocket-flaps {
+    position: absolute;
+    inset: 0;
+    /* CodePen Bottom Flap Geometry */
+    clip-path: polygon(50% 50%, 100% 0, 100% 100%, 0 100%, 0 0);
+    background-color: #e5cf9f;
+    background-image: 
+        radial-gradient(ellipse at 50% 80%, rgba(255, 255, 255, 0.25) 0%, rgba(120, 85, 40, 0.25) 100%),
+        url('/static/img/parchment_texture.jpg');
+    background-size: cover;
+    filter: drop-shadow(0px -4px 6px rgba(30, 15, 5, 0.3));
+}
+
+/* CodePen Left Side Flap */
+.envelope-pocket-flaps:before {
+    content: '';
+    position: absolute;
+    left: 0;
+    width: 50%;
+    height: 100%;
+    clip-path: polygon(100% 50%, 0 0, 0 100%);
+    background-color: #dfc794;
+    background-image: 
+        linear-gradient(135deg, rgba(0, 0, 0, 0.12) 0%, rgba(255, 255, 255, 0.15) 100%),
+        url('/static/img/parchment_texture.jpg');
+    background-size: cover;
+    box-shadow: inset -2px 0 6px rgba(60, 40, 15, 0.2);
+}
+
+/* CodePen Right Side Flap */
+.envelope-pocket-flaps:after {
+    content: '';
+    position: absolute;
+    right: 0;
+    width: 50%;
+    height: 100%;
+    clip-path: polygon(0 50%, 100% 0, 100% 100%);
+    background-color: #dbc38f;
+    background-image: 
+        linear-gradient(-135deg, rgba(0, 0, 0, 0.12) 0%, rgba(255, 255, 255, 0.15) 100%),
+        url('/static/img/parchment_texture.jpg');
+    background-size: cover;
+    box-shadow: inset 2px 0 6px rgba(60, 40, 15, 0.2);
+}
+
+/* Small Handwriting Return Address in Top-Left ("Abs.: Hogwarts...") */
+.env-sender-line {
+    position: absolute;
+    top: 12px;
+    left: 14px;
+    font-family: 'Caveat', 'Marck Script', cursive;
+    font-size: clamp(0.76rem, 2.1vw, 0.88rem);
+    color: #0d3820; /* Authentic Hogwarts Emerald Ink */
+    font-weight: 600;
+    z-index: 16;
+    pointer-events: none;
+    letter-spacing: 0.2px;
+    text-shadow: 0 0 1px rgba(13, 56, 32, 0.25);
+    transition: opacity 0.4s ease;
+    white-space: nowrap;
 }
 
 .envelope-opened .env-sender-line {
     opacity: 0;
 }
 
+/* Hand-Sketched Hogwarts Wax Seal in the Exact Mitte (Center 50% 50%) */
+.sketched-wax-seal {
+    position: absolute;
+    top: 50%; /* Center of envelope */
+    left: 50%;
+    transform: translate(-50%, -50%) rotate(-3deg);
+    width: 72px;
+    height: 72px;
+    border-radius: 50%;
+    cursor: pointer;
+    z-index: 20;
+    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease, opacity 0.4s ease;
+    box-shadow: 
+        0 8px 22px rgba(0, 0, 0, 0.75),
+        0 2px 6px rgba(0, 0, 0, 0.45);
+}
+
+.sketched-wax-seal:hover {
+    transform: translate(-50%, -50%) rotate(0deg) scale(1.1);
+    box-shadow: 
+        0 12px 28px rgba(0, 0, 0, 0.8),
+        0 0 16px rgba(218, 165, 32, 0.45);
+}
+
+.seal-crest-img {
+    width: 100%;
+    height: 100%;
+    border-radius: 50%;
+    object-fit: cover;
+    display: block;
+    border: 2.5px solid #4a0d0d;
+    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.7);
+}
+
+.seal-emboss-ring {
+    position: absolute;
+    inset: 2px;
+    border-radius: 50%;
+    border: 1.5px solid rgba(255, 215, 0, 0.25);
+    box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.2), inset 0 -3px 6px rgba(0, 0, 0, 0.6);
+    pointer-events: none;
+}
+
+.seal-glow {
+    position: absolute;
+    inset: -6px;
+    border-radius: 50%;
+    background: radial-gradient(circle, rgba(255, 215, 0, 0.35) 0%, transparent 70%);
+    opacity: 0;
+    transition: opacity 0.3s ease;
+    pointer-events: none;
+}
+
+.sketched-wax-seal:hover .seal-glow {
+    opacity: 1;
+}
+
+/* Seal Break Golden Animation */
+.envelope-opened .sketched-wax-seal {
+    animation: breakSealAnim 0.7s forwards;
+    pointer-events: none;
+}
+
+@keyframes breakSealAnim {
+    0% { transform: translate(-50%, -50%) rotate(-3deg) scale(1); opacity: 1; filter: none; }
+    50% { transform: translate(-50%, -50%) rotate(10deg) scale(1.2); opacity: 0.8; filter: drop-shadow(0 0 25px #ffd700); }
+    100% { transform: translate(-50%, -50%) rotate(25deg) scale(0.3); opacity: 0; filter: drop-shadow(0 0 40px #ffd700); }
+}
+
 /* Controls Below Parchment */
 .intro-controls-panel {
     margin-top: 20px;
@@ -662,33 +681,45 @@ body {
 }
 
 @media (max-width: 480px) {
-    .envelope-outer-wrap {
-        max-width: 360px;
-        margin: 10px auto 20px;
+    .antique-envelope-scene {
+        width: min(360px, 94vw);
+        height: min(210px, 58vw);
+        margin: 15px auto 25px;
+    }
+    .antique-envelope-scene.envelope-opened,
+    .antique-envelope-scene:has(.envelope-opened) {
+        margin-top: 115px;
+        margin-bottom: 20px;
+    }
+    .envelope-opened .letter-sheet {
+        transform: translateY(-110px) scale(1.02);
+        height: 310px;
+        padding: 12px 14px;
     }
     .sketched-wax-seal {
-        width: 58px;
-        height: 58px;
+        width: 56px;
+        height: 56px;
     }
     .env-sender-line {
         font-size: 0.72rem;
         left: 10px;
+        top: 8px;
     }
     .letter-crest-small {
-        width: 40px;
-        height: 40px;
-        margin-bottom: 6px;
+        width: 38px;
+        height: 38px;
+        margin-bottom: 5px;
     }
     .letter-title {
-        font-size: 0.96rem;
+        font-size: 0.94rem;
     }
     .letter-subtitle {
-        font-size: 0.76rem;
+        font-size: 0.74rem;
         margin-bottom: 10px;
     }
     .btn-launch-express {
-        padding: 7px 14px;
-        font-size: 0.76rem;
+        padding: 7px 13px;
+        font-size: 0.75rem;
     }
     .btn-launch-quiz {
         padding: 12px 18px;
diff --git a/app/static/js/quiz.js b/app/static/js/quiz.js
index 7591ce8..19b663a 100755
--- a/app/static/js/quiz.js
+++ b/app/static/js/quiz.js
@@ -251,10 +251,12 @@ function saveRecentQuestions(ids) {
 
 function breakSealAndOpenLetter() {
     const envelope = document.getElementById("envelope");
+    const scene = document.getElementById("envelopeScene");
     if (!envelope || envelope.classList.contains("envelope-opened")) return;
 
     playSound('magic');
     envelope.classList.add("envelope-opened");
+    if (scene) scene.classList.add("envelope-opened");
 
     // Start background music if enabled or first click
     const bgm = document.getElementById("bgm");
@@ -289,9 +291,11 @@ function breakSealAndOpenLetter() {
 
 function closeLetter() {
     const envelope = document.getElementById("envelope");
+    const scene = document.getElementById("envelopeScene");
     if (!envelope) return;
 
     envelope.classList.remove("envelope-opened");
+    if (scene) scene.classList.remove("envelope-opened");
 
     const breakSealBtn = document.getElementById("breakSealBtn");
     const startBtn = document.getElementById("startBtn");
diff --git a/app/templates/base.html b/app/templates/base.html
index 51e333c..d2359b4 100755
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -8,7 +8,7 @@
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Caveat:wght@500;700&family=Cinzel:wght@600;700&family=Marck+Script&family=MedievalSharp&display=swap" rel="stylesheet">
-    <link rel="stylesheet" href="/static/css/style.css?v=2.9">
+    <link rel="stylesheet" href="/static/css/style.css?v=3.0">
     {% block head %}{% endblock %}
 </head>
 <body>
diff --git a/app/templates/index.html b/app/templates/index.html
index 016bb2b..ffbc7db 100755
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -12,44 +12,42 @@
     <!-- Brief-Intro / Startmaske -->
     <div id="introCard" class="card intro-card intro-parchment-wrapper">
         <!-- Antiker geschlossener Hogwarts-Umschlag (öffnet sich bei Klick auf das Siegel) -->
-        <!-- Briefumschlag (CodePen-Faltarchitektur mit Hogwarts-Optik) -->
-        <div class="envelope-outer-wrap">
-            <div class="envelope-form" id="envelope">
-                <div class="env-wrap">
+        <!-- Briefumschlag (CodePen-Taschenfaltung + Majestätische Aufgleit-Animation) -->
+        <div class="antique-envelope-scene" id="envelopeScene">
+            <div class="envelope-base" id="envelope">
+                <!-- Dunklere Pergament-Innenwand (hinter dem Briefbogen) -->
+                <div class="envelope-interior"></div>
 
-                    <!-- Dunklere Pergament-Innenwand (hinter dem Briefbogen) -->
-                    <div class="env-body-back"></div>
+                <!-- Der darin liegende Briefbogen (gleitet beim Öffnen majestätisch hervor) -->
+                <div class="letter-sheet" id="letterSheet">
+                    <img src="/static/img/hogwarts_seal.jpg" alt="Hogwarts-Wappen" class="letter-crest-small">
+                    <h3 class="letter-title" id="letterTitle">Hogwarts-Schule</h3>
+                    <p class="letter-subtitle" id="letterSubtitle">für Hexerei und Zauberei</p>
+                    <button id="startQuizBtnInLetter" class="btn-launch-express" onclick="startQuizFromLetter()">
+                        🚂 Hogwarts-Express besteigen & Prüfung beginnen ➔
+                    </button>
+                </div>
 
-                    <!-- Der innenliegende Briefbogen (ohne lange Texte, gleitet beim Öffnen heraus) -->
-                    <div class="env-letter-sheet" id="letterSheet">
-                        <img src="/static/img/hogwarts_seal.jpg" alt="Hogwarts-Wappen" class="letter-crest-small">
-                        <h3 class="letter-title" id="letterTitle">Hogwarts-Schule</h3>
-                        <p class="letter-subtitle" id="letterSubtitle">für Hexerei und Zauberei</p>
-                        <button id="startQuizBtnInLetter" class="btn-launch-express" onclick="startQuizFromLetter()">
-                            🚂 Hogwarts-Express besteigen & Prüfung beginnen ➔
-                        </button>
-                    </div>
+                <!-- Obere V-Klappe nach CodePen-Geometrie (schließt nach unten zur Mitte) -->
+                <div class="env-top-flap" id="envelopeFlap">
+                    <div class="env-top-sketch-line"></div>
+                </div>
 
-                    <!-- Obere V-Klappe (schließt von oben nach unten zur Mitte) -->
-                    <div class="env-top" id="envelopeFlap"></div>
+                <!-- Untere Tasche nach CodePen-Geometrie (Boden- und Seitenflügel) -->
+                <div class="envelope-pocket">
+                    <div class="envelope-pocket-flaps"></div>
+                </div>
 
-                    <!-- Untere Tasche mit Seiten- und Bodenfalzen (CodePen-Taschenfalz) -->
-                    <div class="env-bottom-wrap">
-                        <div class="env-bottom"></div>
-                    </div>
-
-                    <!-- Absender oben links (dezent, klein, wie auf einem echten Brief) -->
-                    <div class="env-sender-line" id="envSenderLine">
-                        Abs.: Hogwarts Schule für Hexerei und Zauberei
-                    </div>
-
-                    <!-- Handgezeichnetes Hogwarts-Wachssiegel exakt in der Mitte -->
-                    <div class="sketched-wax-seal" id="waxSeal" onclick="breakSealAndOpenLetter()" title="Siegel brechen & Brief öffnen">
-                        <img src="/static/img/hogwarts_seal.jpg" alt="Hogwarts-Wappen Siegel" class="seal-crest-img">
-                        <div class="seal-emboss-ring"></div>
-                        <div class="seal-glow"></div>
-                    </div>
+                <!-- Absender oben links (dezent, klein, wie auf einem echten Brief) -->
+                <div class="env-sender-line" id="envSenderLine">
+                    Abs.: Hogwarts Schule für Hexerei und Zauberei
+                </div>
 
+                <!-- Handgezeichnetes Hogwarts-Wachssiegel exakt in der Mitte -->
+                <div class="sketched-wax-seal" id="waxSeal" onclick="breakSealAndOpenLetter()" title="Siegel brechen & Brief öffnen">
+                    <img src="/static/img/hogwarts_seal.jpg" alt="Hogwarts-Wappen Siegel" class="seal-crest-img">
+                    <div class="seal-emboss-ring"></div>
+                    <div class="seal-glow"></div>
                 </div>
             </div>
         </div>
@@ -158,5 +156,5 @@
 {% endblock %}
 
 {% block scripts %}
-<script src="/static/js/quiz.js?v=2.9"></script>
+<script src="/static/js/quiz.js?v=3.0"></script>
 {% endblock %}