html, body { 
    width: 100%;
    min-height: 100%;
    overflow-y: auto; /* Erlaubt Scrollen auf Laptops mit geringer Bildschirmhöhe */
}
body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 5px 10px;
    background: radial-gradient(circle at top, #1e293b, #0f172a);
    color: #f8fafc;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-sizing: border-box;
    -webkit-user-select: none; /* Verhindert nerviges Text-Markieren beim schnellen Tippen auf dem Tablet */
    user-select: none;
}
h1 { margin: 2px 0 8px 0; font-size: 1.3rem; text-align: center; }

.container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    width: 100%;
    max-width: 1800px;
}

.panel {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 15px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    max-width: 440px;
    flex: 1 1 400px;
    box-sizing: border-box;
    gap: 10px;
}

/* Die Zeichenfläche (2D) */
canvas#draw2D {
    overscroll-behavior: none;
    background-color: white;
    background-image: linear-gradient(#f0f0f0 2px, transparent 2px), linear-gradient(90deg, #f0f0f0 2px, transparent 2px);
    background-size: 5% 5%; /* Karomuster passend zum 25er Koordinaten-Raster */
    border-radius: 5px;
    cursor: crosshair;
    touch-action: none;
    width: 100%;
    max-height: 60vh;
    aspect-ratio: 1 / 1;
}

/* Die 3D Ansicht */
div#view3D {
    overscroll-behavior: none;
    background-color: #1a252f;
    border-radius: 5px;
    width: 100%;
    max-height: 60vh;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    cursor: move;
    position: relative; /* Wichtig für die Overlay-Buttons */
}

.controls {
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px; /* Kompakter, damit unten auf Handys nichts verschwindet */
    width: 100%;
}

.button-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

button {
    padding: 10px 18px;
    font-size: 1.05rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}
button:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}
#clearBtn { background-color: #e74c3c; color: white; }
#clearBtn:hover { background-color: #c0392b; }
#undoBtn { background-color: #f39c12; color: white; }
#undoBtn:hover { background-color: #d68910; }
.newStudentBtn { background-color: #e67e22; color: white; }
.newStudentBtn:hover { background-color: #d35400; }

/* Der wichtigste Knopf wird größer und auffälliger */
#sendBtn { background-color: #2ecc71; color: white; font-size: 0.95rem; padding: 8px 12px; box-shadow: 0 2px 5px rgba(46, 204, 113, 0.3); border: 2px solid #27ae60; flex: 1 1 120px; }
#sendBtn:hover { background-color: #27ae60; transform: scale(1.05); }

#downloadBtn { background-color: #9b59b6; color: white; font-size: 0.95rem; padding: 8px 12px; flex: 1 1 120px; }
#downloadBtn:hover { background-color: #8e44ad; }
.shape-btn { background-color: #3498db; padding: 8px 15px; font-size: 1.2rem; flex-grow: 1; }
.shape-btn:hover { background-color: #2980b9; }

/* Responsive Tool Grid für Zeichnen */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 5px;
    width: 100%;
}
@media (max-width: 500px) {
    .tool-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }
}

.slider-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 6px 12px;
    border-radius: 10px;
}
.slider-container select,
.slider-container input[type="text"] {
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
}

/* Neue Farben-Buttons statt verwirrendem System-Color-Picker */
.color-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid transparent;
    cursor: pointer;
    transition: transform 0.2s, border-color 0.2s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}
.color-btn:hover, .color-btn.active {
    transform: scale(1.15);
    border-color: white;
}

/* Erlaubt das Markieren von Text NUR in echten Eingabefeldern */
input {
    -webkit-user-select: auto;
    user-select: auto;
}

input[type="range"] { flex-grow: 1; margin: 0 15px; }

/* Footer & Rechtliches */
.footer {
    margin-top: 30px;
    font-size: 0.85rem;
    color: #95a5a6;
    text-align: center;
}
.footer a { color: #bdc3c7; text-decoration: none; cursor: pointer; }
.footer a:hover { color: white; text-decoration: underline; }

/* Barrierefreiheit & Inklusion: Sichtbarer Fokus für Tastaturnavigation */
button:focus-visible, input:focus-visible, select:focus-visible {
    outline: 3px solid #f1c40f !important;
    outline-offset: 2px;
}

.modal {
    display: none; position: fixed; z-index: 100; left: 0; top: 0;
    width: 100%; height: 100%; background-color: rgba(0,0,0,0.6);
}
.modal-content {
    background-color: #34495e; margin: 10% auto; padding: 25px;
    border-radius: 10px; width: 90%; max-width: 600px;
    color: white; line-height: 1.5; box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    max-height: 80vh; overflow-y: auto;
}
.modal-content h2 { margin-top: 0; border-bottom: 1px solid #7f8c8d; padding-bottom: 10px; }
.close-modal {
    color: #bdc3c7; float: right; font-size: 28px; font-weight: bold; cursor: pointer;
}
.close-modal:hover { color: white; }

/* Buttons in den Modals */
.modal-btn { padding: 10px 20px; font-size: 1rem; border: none; border-radius: 5px; cursor: pointer; font-weight: bold; }
.modal-btn-primary { background-color: #3498db; color: white; }
.modal-btn-primary:hover { background-color: #2980b9; }
.modal-btn-secondary { background-color: #7f8c8d; color: white; }
.modal-btn-secondary:hover { background-color: #95a5a6; }
.modal-btn-danger { background-color: #e74c3c; color: white; }
.modal-btn-danger:hover { background-color: #c0392b; }

/* TTS (Vorlese) Buttons */
.tts-btn {
    background: none; border: none; font-size: 1.5rem; cursor: pointer;
    padding: 0 5px; vertical-align: middle; transition: transform 0.2s;
}
.tts-btn:hover { transform: scale(1.2); }

/* Mobile Navigation (Wizard) */
.mobile-nav-btn {
    background-color: #f39c12; color: white; width: 100%; font-size: 1rem; padding: 10px; margin: 5px 0; border: none; border-radius: 5px; cursor: pointer; font-weight: bold;
}

/* Lade-Spinner für Web-Worker (CSG Gravur) */
#loadingOverlay {
    display: none;
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(44, 62, 80, 0.95);
    z-index: 9999;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
}
.spinner {
    border: 8px solid rgba(255, 255, 255, 0.1); border-top: 8px solid #3498db;
    border-radius: 50%; width: 80px; height: 80px; animation: spin 1s linear infinite; margin-bottom: 25px;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.mobile-nav-btn:hover { background-color: #d68910; }

/* --- Workspace Cards --- */
.workspace-card {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 15px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    box-sizing: border-box;
    gap: 10px;
}

/* --- Accordions --- */
.accordion {
    background: #1e293b;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 5px;
}
.accordion-trigger {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: white;
    padding: 12px 15px;
    font-size: 1.05rem;
    font-weight: 600;
    text-align: left;
    width: 100%;
    cursor: pointer;
    border: none;
    outline: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}
.accordion-trigger:hover {
    background: linear-gradient(135deg, #2c3e50, #1e293b);
}
.accordion-trigger::after {
    content: '▼';
    font-size: 0.8rem;
    transition: transform 0.3s;
    color: #f1c40f;
}
.accordion.open .accordion-trigger::after {
    transform: rotate(180deg);
}
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    padding: 0 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    box-sizing: border-box;
}
.accordion.open .accordion-content {
    max-height: 1200px;
    padding: 15px;
    transition: max-height 0.5s ease-in, padding 0.5s ease-in;
}

/* --- Tab-Navigation --- */
.tab-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 5px auto 15px auto;
    background: rgba(15, 23, 42, 0.85); /* Mehr Kontrast für Sticky-Ansicht */
    padding: 6px 12px;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(12px);
    width: fit-content;
    max-width: 95%;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
    position: sticky;
    top: 5px;
    z-index: 1000;
}
.tab-btn {
    background: transparent;
    color: #94a3b8;
    border: none;
    padding: 10px 24px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: none;
}
.tab-btn:hover {
    color: #f8fafc;
    background: rgba(255, 255, 255, 0.06);
    transform: none;
    box-shadow: none;
}
.tab-btn.active {
    background: #3498db;
    color: white;
    box-shadow: 0 0 15px rgba(52, 152, 219, 0.6); /* Besser sichtbarer Leuchteffekt */
}
.tab-btn.active:hover {
    background: #2980b9;
    transform: none;
}

@media (min-width: 801px) {
    .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        max-width: 1200px;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
        gap: 0;
    }

    .panel {
        display: grid !important;
        grid-template-columns: 1fr 380px;
        gap: 24px;
        width: 100%;
        max-width: 1200px !important;
        background: none !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
    }

    .panel.mobile-hidden {
        display: none !important;
    }

    /* Navigations-Knöpfe am Desktop ausblenden */
    .mobile-nav-btn {
        display: none !important;
    }

    #view2DCard, #view3DCard {
        grid-column: 1;
        grid-row: 1 / span 3;
        align-self: start;
        max-width: 680px;
        width: 100%;
        justify-self: center;
    }

    canvas#draw2D, div#view3D {
        max-height: 650px;
        max-width: 650px;
        width: 100%;
        aspect-ratio: 1 / 1;
        margin: 0 auto;
    }

    #accDraw {
        grid-column: 2;
        grid-row: 1;
    }

    #acc3D {
        grid-column: 2;
        grid-row: 1;
    }

    #accExport {
        grid-column: 2;
        grid-row: 2;
    }

    /* Desktop-Vergrößerung der Tabs */
    .tab-container {
        gap: 20px;
        padding: 8px 16px;
        margin-top: 10px;
        margin-bottom: 25px;
        border: 1.5px solid rgba(255, 255, 255, 0.15);
    }
    .tab-btn {
        padding: 12px 30px;
        font-size: 1.25rem;
        border-radius: 25px;
    }
}

@media (max-width: 800px) {
    /* Erlaubt vertikales Scrollen auf Handys */
    html, body {
        overflow-y: auto !important;
        position: static !important;
        height: auto !important;
    }

    .container {
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 10px;
        width: 100%;
        box-sizing: border-box;
    }

    /* Ausblenden der inaktiven Panels auf Handys */
    .panel {
        display: flex !important;
        flex-direction: column;
        gap: 15px;
        background: none !important;
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        width: 100%;
        max-width: 500px;
    }

    .panel.mobile-hidden {
        display: none !important;
    }

    /* Kompaktere Karten und Accordions auf Mobilgeräten */
    .workspace-card {
        padding: 10px;
        border-radius: 12px;
        gap: 6px;
    }
    .accordion {
        margin-bottom: 8px;
    }
    .accordion-trigger {
        padding: 10px 12px;
        font-size: 1rem;
    }
    .accordion-content {
        padding: 0 10px;
        gap: 6px;
    }
    .accordion.open .accordion-content {
        padding: 10px;
    }

    /* Slider-Container Umbruch auf Mobilgeräten zur Vermeidung von Breiten-Überlauf */
    .slider-container {
        flex-wrap: wrap;
        gap: 8px 0;
        padding: 10px;
    }
    .slider-container label {
        flex: 1 1 100%;
        margin-bottom: 4px;
        min-width: 0 !important;
    }
    .slider-container select,
    .slider-container input[type="text"] {
        margin: 0 !important;
        width: 100% !important;
        box-sizing: border-box;
    }
}

/* Dynamische Skalierung basierend auf der Bildschirmhöhe (nur für Mobilgeräte) */
@media (max-height: 730px) and (max-width: 800px) {
    body {
        padding: 2px 10px;
    }
    h1 {
        margin: 2px 0 6px 0;
        font-size: 1.2rem;
    }
}

@media (max-height: 1000px) {
    body {
        padding: 4px 10px;
    }
    h1 {
        margin: 2px 0 6px 0;
        font-size: 1.25rem;
    }
    button {
        padding: 8px 12px;
        font-size: 0.95rem;
    }
    .newStudentBtn {
        padding: 8px 12px !important;
        font-size: 1rem !important;
    }
    input[type="text"] {
        padding: 6px !important;
        font-size: 1.1rem !important;
    }
}