/* static/css/style.css - Ultra Modern Theme (2025 Edition) */

/* --- Variablen mit erweiterter Farbpalette --- */
:root {
    /* Hauptfarben - Modernes Blau-Grün Farbschema */
    --primary-color: #3b82f6; /* Blau - Basis */
    --primary-light: #93c5fd; /* Helleres Blau */
    --primary-dark: #1d4ed8; /* Dunkleres Blau */
    
    --secondary-color: #10b981; /* Grün - Modern */
    --secondary-light: #6ee7b7; /* Helleres Grün */
    --secondary-dark: #059669; /* Dunkleres Grün */
    
    --accent-color: #f59e0b; /* Amber/Gold für Akzente */
    --accent-light: #fcd34d; /* Helleres Gold */
    
    /* Neutrale Töne - für Hintergründe und Text */
    --light-bg: #f8fafc; /* Sehr helles Grau mit blauem Unterton */
    --dark-bg: #0f172a; /* Fast schwarz mit leichtem Blauton */
    --navbar-bg: var(--dark-bg);
    --footer-bg: #020617; /* Noch dunkler für Footer */
    
    --text-color: #334155; /* Dunkles Slate Grau */
    --text-muted-color: #64748b; /* Mittleres Grau */
    --heading-color: #1e293b; /* Dunkleres Grau für Überschriften */
    
    /* UI Elemente */
    --link-color: var(--primary-color);
    --border-color: #e2e8f0; /* Helles Grau */
    --border-radius-sm: 0.375rem;
    --border-radius: 0.75rem; /* Größere Rundungen für modernen Look */
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    
    /* Schatten mit modernen Werten */
    --box-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --box-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    
    /* Glasmorphismus Elemente */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.18);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.2);
    --glass-blur: 8px;
    
    /* Schriftart - Moderne und leichte Schriftfamilie */
    --font-family-base: 'Inter', 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-heading: 'Inter', 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Animation Timing */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* --- Globale Styles mit mehr Raffinesse --- */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--light-bg);
    color: var(--text-color);
    padding-top: 0;
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family-heading);
    font-weight: 700;
    color: var(--heading-color);
    margin-top: 0;
    letter-spacing: -0.02em;
}

.display-5 {
    font-weight: 800 !important;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: all var(--transition-normal);
    position: relative;
}

a:hover {
    color: var(--primary-dark);
}

/* Moderner Link Underline Effekt */
a.fancy-link {
    position: relative;
    font-weight: 500;
}

a.fancy-link::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -2px;
    left: 0;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform 0.3s;
}

a.fancy-link:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* Verbesserte Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: all var(--transition-normal);
    box-shadow: var(--box-shadow-sm);
    border: none;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
    text-transform: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.65, 0.05, 0.36, 1);
    z-index: 1;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

.btn:hover::before {
    transform: translateX(0);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--box-shadow-sm);
}

.btn span {
    position: relative;
    z-index: 2;
}

.btn-primary { 
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)); 
    color: white; 
}

.btn-primary:hover { 
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color)); 
}

.btn-secondary { 
    background: linear-gradient(135deg, var(--secondary-color), var(--secondary-dark)); 
    color: white; 
}

.btn-secondary:hover { 
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-color)); 
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent-color), #e97706);
    color: white;
}

.btn-accent:hover {
    background: linear-gradient(135deg, #e97706, var(--accent-color));
}

.btn-outline-primary { 
    border: 2px solid var(--primary-color); 
    color: var(--primary-color); 
    background: transparent; 
}

.btn-outline-primary:hover { 
    background-color: var(--primary-color); 
    color: white; 
}

.btn-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    color: var(--dark-bg);
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.85);
}

.btn-sm { 
    padding: 0.5rem 1rem; 
    font-size: 0.875rem; 
    border-radius: var(--border-radius-sm);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    border-radius: var(--border-radius-lg);
}

/* Formularelemente mit mehr Stil */
.form-control, .form-select { 
    border-radius: var(--border-radius); 
    border: 1px solid var(--border-color); 
    padding: 0.75rem 1rem; 
    transition: all 0.2s ease-in-out; 
    background-color: #fff; 
    font-size: 1rem;
}

.form-control:focus, .form-select:focus { 
    border-color: var(--primary-color); 
    box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.15); 
}

.form-control::placeholder { 
    color: #9ca3af; 
    opacity: 1; 
}

/* Moderne Karten/Cards */
.card { 
    border: none;
    border-radius: var(--border-radius-lg); 
    box-shadow: var(--box-shadow); 
    background-color: #fff; 
    overflow: hidden; 
    transition: all var(--transition-normal);
}

.card:hover {
    box-shadow: var(--box-shadow-lg);
    transform: translateY(-5px);
}

.card-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* --- Header & Banner mit Originalgröße --- */
.site-header { 
    background-color: rgba(255, 255, 255, 0.98); 
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.site-header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.banner-wrapper {
    position: relative;
    overflow: hidden;
    padding: 0;
    text-align: center;
}

.banner-image {
    width: auto; /* Auto-Breite statt volle Breite */
    height: auto; /* Behält das ursprüngliche Seitenverhältnis */
    max-height: 200px; /* Begrenzte Höhe */
    max-width: 100%; /* Verhindert Überlauf auf mobilen Geräten */
    object-fit: contain; /* Beibehaltung des Seitenverhältnisses */
    display: block;
    margin-left: auto; 
    margin-right: auto;
    transition: transform 0.5s ease;
}

.banner-wrapper:hover .banner-image {
    transform: scale(1.02);
}

/* Banner-Overlay nur für volle Breite Banner */
.banner-overlay {
    display: none; /* Ausgeblendet, da der Banner nicht die volle Breite einnimmt */
}

/* Banner-Content nur für volle Breite Banner */
.banner-content {
    display: none; /* Ausgeblendet, da der Banner nicht die volle Breite einnimmt */
}

.banner-fallback { 
    display: none; 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    background-color: #e9ecef; 
    color: var(--text-muted-color); 
    font-size: 1rem; 
    align-items: center; 
    justify-content: center; 
    min-height: 80px;
}

/* --- Navigation mit Glaseffekt --- */
.site-navbar { 
    background: rgba(15, 23, 42, 0.95) !important; 
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15); 
    padding-top: 0.75rem; 
    padding-bottom: 0.75rem; 
    transition: all 0.3s ease;
}

.site-navbar .navbar-brand { 
    color: #fff; 
    font-weight: 700;
    font-size: 1.5rem;
    transition: all var(--transition-normal); 
}

.site-navbar .navbar-brand:hover { 
    color: var(--primary-light); 
    transform: translateY(-1px);
}

.site-navbar .navbar-brand .bi { 
    margin-right: 0.5rem; 
    vertical-align: -2px; 
}

.site-navbar .nav-link { 
    color: rgba(255, 255, 255, 0.85); 
    font-weight: 500; 
    padding: 0.5rem 1.2rem; 
    margin: 0 0.25rem; 
    border-radius: var(--border-radius); 
    transition: all var(--transition-normal); 
    position: relative;
}

.site-navbar .nav-link::after {
    content: '';
    position: absolute;
    width: 60%;
    height: 2px;
    bottom: 0.3rem;
    left: 20%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s;
}

.site-navbar .nav-link:hover { 
    color: #fff; 
}

.site-navbar .nav-link:hover::after {
    transform: scaleX(1);
}

.site-navbar .nav-link.active { 
    color: #fff; 
    background-color: rgba(59, 130, 246, 0.15); 
    font-weight: 600; 
}

.site-navbar .nav-link.active::after {
    transform: scaleX(1);
}

.site-navbar .btn-sm { 
    padding: 0.4rem 1rem; 
}

/* Specific Nav Button Colors */
.site-navbar .btn-outline-success { 
    border: 2px solid rgba(var(--bs-success-rgb), 0.6); 
    color: rgba(var(--bs-success-rgb), 1); 
    background: rgba(var(--bs-success-rgb), 0.05);
}

.site-navbar .btn-outline-success:hover { 
    border-color: var(--bs-success); 
    background-color: var(--bs-success); 
    color: white; 
}

.site-navbar .btn-outline-warning { 
    border: 2px solid rgba(var(--bs-warning-rgb), 0.6); 
    color: rgba(var(--bs-warning-rgb), 1); 
    background: rgba(var(--bs-warning-rgb), 0.05);
}

.site-navbar .btn-outline-warning:hover { 
    border-color: var(--bs-warning); 
    background-color: var(--bs-warning); 
    color: var(--dark-bg); 
}

/* --- Seiten Titel mit Animation --- */
.site-title { 
    color: var(--dark-bg); 
    padding-bottom: 0.75rem; 
    margin-bottom: 2.5rem !important; 
    position: relative; 
    display: inline-block; 
    font-size: 2.25rem;
    font-weight: 800;
}

.site-title::after { 
    content: ''; 
    position: absolute; 
    bottom: -2px; 
    left: 0; 
    width: 100px; 
    height: 6px; 
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%); 
    border-radius: 3px; 
    animation: gradient-shift 5s ease-in-out infinite;
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* --- Upload Bereich mit Animationen --- */
.upload-area { 
    background-color: #fff; 
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    transition: all var(--transition-normal);
}

.upload-area:hover {
    box-shadow: var(--box-shadow-lg);
    transform: translateY(-5px);
}

.drop-zone-style { 
    border: 3px dashed #cbd5e1; 
    transition: all var(--transition-normal); 
    cursor: pointer; 
    background-color: #f8fafc; 
    border-radius: var(--border-radius-lg);
    padding: 2.5rem 1.5rem;
    position: relative;
    overflow: hidden;
}

.drop-zone-style::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
                rgba(59, 130, 246, 0.05) 0%, 
                rgba(16, 185, 129, 0.05) 50%,
                rgba(245, 158, 11, 0.05) 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.drop-zone-style:hover, .drop-zone-style.dragover { 
    background-color: #f8fafc; 
    border-color: var(--primary-color); 
    transform: translateY(-2px);
}

.drop-zone-style:hover::before, .drop-zone-style.dragover::before {
    opacity: 1;
}

.drop-zone-style.dragover {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.4);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
    }
}

.drop-zone-style p .bi { 
    font-size: 3.5rem !important; 
    color: var(--primary-color); 
    transition: all var(--transition-slow); 
    display: block;
    margin: 0 auto 1rem;
}

.drop-zone-style:hover p .bi { 
    color: var(--primary-dark); 
    transform: translateY(-5px);
}

.drop-zone-style p {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
    text-align: center;
    margin: 0;
}

.drop-zone-style small {
    display: block;
    text-align: center;
    color: var(--text-muted-color);
    margin-top: 0.5rem;
}

/* --- Dateiliste mit verbesserten Karten --- */
.file-card {
    border: none;
    transition: all var(--transition-normal);
    border-radius: var(--border-radius-lg);
    background-color: #fff;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
}

.file-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.file-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--box-shadow-xl);
}

.file-card:hover::after {
    transform: scaleX(1);
}

.file-thumbnail-link {
    height: 160px;
    background-color: #f8fafc;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border-top-left-radius: var(--border-radius-lg);
    border-top-right-radius: var(--border-radius-lg);
    position: relative;
    cursor: pointer;
}

.file-thumbnail-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, 
                rgba(0, 0, 0, 0) 70%, 
                rgba(0, 0, 0, 0.05) 100%);
    z-index: 1;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.file-card:hover .file-thumbnail-link::before {
    opacity: 1;
}

.file-thumbnail {
    display: block;
    max-height: 100%;
    max-width: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: transform var(--transition-slow);
}

.file-card:hover .file-thumbnail {
    transform: scale(1.12);
}

.file-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-bg);
    margin-top: 1rem;
    margin-bottom: 0.25rem;
    padding: 0 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    font-size: 0.85rem;
    color: var(--text-muted-color);
    padding: 0 1rem;
    margin-bottom: 1rem;
}

.file-actions {
    padding: 0 1rem 1rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    margin-top: auto;
    display: flex;
    gap: 0.5rem;
}

.file-actions .btn {
    flex-grow: 1;
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius);
    margin: 0;
}

.file-actions .btn .bi {
    margin-right: 0.3rem;
    font-size: 1.1em;
    vertical-align: -2px;
}

.file-actions .button-text.d-none {
    display: none !important;
}

@media (min-width: 992px) {
    .file-actions .button-text.d-none.d-lg-inline {
        display: inline !important;
    }
}

/* Verbesserte Listenansicht */
#file-list.list-view .row,
#admin-file-list.list-view .row {
    display: block; /* Ändert das Flexbox-Layout zu Block */
}

#file-list.list-view .file-item,
#admin-file-list.list-view .file-item {
    width: 100%; /* Volle Breite für jedes Element */
    max-width: 100%;
    margin-bottom: 1rem;
}

#file-list.list-view .card,
#admin-file-list.list-view .card {
    flex-direction: row; 
    align-items: center; 
    box-shadow: var(--box-shadow); 
    background-color: #fff;
    height: auto;
}

#file-list.list-view .card:hover,
#admin-file-list.list-view .card:hover {
    transform: translateY(-3px); 
    box-shadow: var(--box-shadow-lg);
}

#file-list.list-view .file-thumbnail-link,
#admin-file-list.list-view .file-thumbnail-link {
    flex: 0 0 100px; 
    height: 70px; 
    padding: 0.5rem; 
    border-radius: var(--border-radius-lg) 0 0 var(--border-radius-lg);
    border-right: 1px solid var(--border-color);
}

#file-list.list-view .file-thumbnail,
#admin-file-list.list-view .file-thumbnail {
    transform: none;
}

#file-list.list-view .card-body,
#admin-file-list.list-view .card-body {
    flex: 1; 
    padding: 0.75rem 1.25rem; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
}

#file-list.list-view .file-name,
#admin-file-list.list-view .file-name {
    flex-basis: 40%; 
    margin-right: 1rem; 
    font-size: 1rem; 
    white-space: normal; 
    overflow: visible; 
    text-overflow: clip; 
    margin-top: 0; 
    margin-bottom: 0; 
    padding: 0;
}

#file-list.list-view .file-size,
#admin-file-list.list-view .file-size {
    flex-basis: 18%; 
    text-align: right; 
    margin-right: 1.5rem; 
    font-size: 0.85rem; 
    margin-bottom: 0; 
    padding: 0;
}

#file-list.list-view .file-actions,
#admin-file-list.list-view .file-actions {
    flex-basis: 42%; 
    justify-content: flex-end; 
    border-top: none; 
    padding: 0; 
    margin-top: 0; 
    flex-wrap: nowrap;
}

/* Für responsive Anpassung */
@media (max-width: 767.98px) {
    #file-list.list-view .card-body,
    #admin-file-list.list-view .card-body {
        flex-direction: column;
        align-items: flex-start;
    }
    
    #file-list.list-view .file-name,
    #admin-file-list.list-view .file-name {
        flex-basis: 100%;
        margin-bottom: 0.5rem;
    }
    
    #file-list.list-view .file-size,
    #admin-file-list.list-view .file-size {
        flex-basis: 100%;
        text-align: left;
        margin-bottom: 0.5rem;
    }
    
    #file-list.list-view .file-actions,
    #admin-file-list.list-view .file-actions {
        flex-basis: 100%;
        justify-content: flex-start;
    }
}

/* --- Chat Styling mit modernen Blasen --- */
.chat-box-style { 
    background-color: #fff; 
    border: none;
    border-radius: var(--border-radius-lg); 
    box-shadow: var(--box-shadow-lg);
    overflow: hidden;
}

.chat-message { 
    padding: 1rem 1.25rem; 
    border-radius: var(--border-radius-lg); 
    margin: 0.75rem;
    word-wrap: break-word; 
    position: relative; 
    transition: all var(--transition-normal); 
    border-bottom: none;
    background-color: #f1f5f9;
}

.chat-message.user-message {
    background-color: #eff6ff;
    border-top-right-radius: 0.3rem;
    margin-left: 2rem;
}

.chat-message.other-message {
    background-color: #f1f5f9;
    border-top-left-radius: 0.3rem;
    margin-right: 2rem;
}

.chat-message:last-child { 
    border-bottom: none; 
}

.chat-message:hover { 
    background-color: #f8fafc; 
}

.chat-message .message-nickname { 
    font-weight: 700;
    margin-right: 5px; 
    color: var(--primary-dark);
}

.chat-message .message-time {
    font-size: 0.75rem;
    color: var(--text-muted-color);
    margin-top: 3px;
    display: block;
}

.chat-message .message-text { 
    line-height: 1.5;
}

.chat-message .message-text a { 
    color: var(--link-color); 
    text-decoration: underline; 
    font-weight: 500; 
}

.chat-message .message-text a:hover { 
    color: var(--primary-dark); 
}

.chat-message .delete-message-btn { 
    position: absolute; 
    top: 0.5rem; 
    right: 0.5rem; 
    opacity: 0; 
    transition: all var(--transition-normal); 
    font-size: 0.85rem; 
    padding: 0.25rem 0.5rem;
    line-height: 1;
    background-color: rgba(239, 68, 68, 0.1); 
    color: #ef4444; 
    border: 1px solid rgba(239, 68, 68, 0.2); 
    border-radius: var(--border-radius-sm);
}

.chat-message:hover .delete-message-btn { 
    opacity: 1; 
    transform: translateX(0);
}

.chat-message .delete-message-btn:hover { 
    background-color: #ef4444; 
    color: white; 
    transform: scale(1.1);
}

.chat-input-container {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    background-color: #fff;
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.chat-input {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    flex-grow: 1;
    padding: 0.75rem 1rem;
    background-color: #f8fafc;
    transition: all var(--transition-normal);
}

.chat-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background-color: #fff;
}

.chat-send-btn {
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    padding: 0.75rem 1.25rem;
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all var(--transition-normal);
}

.chat-send-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.chat-send-btn .bi {
    font-size: 1.1rem;
}

/* --- Footer mit Glaseffekt --- */
.site-footer { 
    background-color: var(--footer-bg); 
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    z-index: 1;
}

.footer-container {
    position: relative;
    padding: 3rem 0 2rem;
    z-index: 2;
}

.footer-heading {
    color: #fff;
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    position: relative;
    display: inline-block;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 3px;
    background-color: var(--primary-color);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-normal);
    display: inline-block;
}

.footer-links a:hover {
    color: #fff;
    transform: translateX(3px);
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.social-icon {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: all var(--transition-normal);
}

.social-icon:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem 0;
    font-size: 0.85rem;
}

/* --- Modals mit Glaseffekt --- */
.modal-content { 
    border-radius: var(--border-radius-lg); 
    border: none; 
    box-shadow: var(--box-shadow-xl);
    overflow: hidden;
    background-color: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-header { 
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%); 
    color: white; 
    border-bottom: none; 
    padding: 1.25rem 1.5rem;
    position: relative;
}

.modal-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
}

.modal-header .btn-close { 
    filter: invert(1) grayscale(100%) brightness(200%); 
    opacity: 0.8; 
    transition: all var(--transition-normal);
}

.modal-header .btn-close:hover { 
    opacity: 1; 
    transform: rotate(90deg);
}

.modal-title { 
    font-weight: 600; 
    font-size: 1.25rem;
    letter-spacing: 0.01em;
}

.modal-body { 
    padding: 1.75rem; 
    background-color: #fff;
}

.modal-footer {
    background-color: #f8fafc;
    border-top: 1px solid var(--border-color);
    border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
}

.preview-media { 
    max-width: 100%; 
    max-height: 75vh; 
    display: block; 
    margin: 0 auto; 
    border-radius: var(--border-radius); 
    box-shadow: var(--box-shadow);
}

.preview-pdf { 
    width: 100%; 
    height: 75vh; 
    border: none; 
    border-radius: var(--border-radius);
}

.preview-video, .preview-audio { 
    box-shadow: var(--box-shadow-lg);
    border-radius: var(--border-radius);
    width: 100%;
}

/* --- FullCalendar Styles modernisiert --- */
.fc-wrapper { 
    min-height: 600px; 
    position: relative; 
    background-color: #fff; 
    padding: 1.75rem; 
    border-radius: var(--border-radius-lg); 
    box-shadow: var(--box-shadow-lg);
    transition: all var(--transition-normal);
}

.fc-wrapper:hover {
    box-shadow: var(--box-shadow-xl);
}

.calendar-loading { 
    position: absolute; 
    top: 40%; 
    left: 50%; 
    transform: translate(-50%, -50%); 
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.fc { 
    font-size: 0.95rem; 
    --fc-border-color: var(--border-color, #e2e8f0); 
    --fc-today-bg-color: rgba(59, 130, 246, 0.08);
    --fc-highlight-color: rgba(59, 130, 246, 0.2);
    --fc-event-border-color: var(--primary-color);
    --fc-event-bg-color: var(--primary-color);
    --fc-event-text-color: #fff;
}

.fc .fc-highlight {
    background: var(--primary-color);
    opacity: 0.2;
}

.fc .fc-toolbar.fc-header-toolbar { 
    margin-bottom: 1.5em; 
    flex-wrap: wrap;
    gap: 0.5rem;
}

.fc .fc-toolbar-title { 
    font-size: 1.75rem; 
    font-weight: 700; 
    color: var(--heading-color); 
    letter-spacing: -0.02em;
}

/* Buttons */
.fc .fc-button { 
    background-color: #fff; 
    border: 1px solid var(--border-color); 
    color: var(--text-color); 
    text-transform: none; 
    box-shadow: var(--box-shadow-sm) !important; 
    transition: all var(--transition-normal); 
    padding: 0.5em 1em; 
    border-radius: var(--border-radius);
    font-weight: 500;
}

.fc .fc-button .fc-icon { 
    vertical-align: middle;
}

.fc .fc-button:hover { 
    background-color: #f8fafc; 
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.fc .fc-button-primary { 
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)); 
    border-color: var(--primary-color); 
    color: white; 
}

.fc .fc-button-primary:hover { 
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color)); 
    border-color: var(--primary-dark); 
}

.fc .fc-button-primary:disabled { 
    background-color: var(--text-muted-color); 
    border-color: var(--text-muted-color); 
    opacity: 0.65; 
}

/* Tages-Styling */
.fc-theme-standard .fc-scrollgrid {
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.fc-daygrid-day.fc-day-today { 
    background-color: rgba(59, 130, 246, 0.1) !important;
    position: relative;
}

.fc-daygrid-day.fc-day-today::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.fc-daygrid-day-number { 
    font-weight: 500; 
    padding: 0.5em 0.75em !important; 
    color: var(--text-color);
    opacity: 0.8;
    transition: all var(--transition-normal);
}

.fc-daygrid-day-number:hover {
    opacity: 1;
    background-color: rgba(59, 130, 246, 0.1);
    border-radius: var(--border-radius-sm);
}

.fc-col-header-cell-cushion { 
    font-weight: 600; 
    color: var(--text-color); 
    text-decoration: none;
    padding: 0.75em 0.5em !important;
    text-transform: uppercase;
    font-size: 0.85em;
    letter-spacing: 0.05em;
}

/* Event-Styling */
.fc-event { 
    border-radius: var(--border-radius-sm); 
    padding: 0.3em 0.6em; 
    font-size: 0.85em; 
    cursor: pointer; 
    transition: all var(--transition-normal); 
    white-space: normal !important; 
    overflow: hidden; 
    border: 1px solid var(--primary-color) !important;
    background-color: var(--primary-color); 
    color: white;
    box-shadow: var(--box-shadow-sm);
}

.fc-event.event-important {
    background-color: var(--accent-color) !important;
    border-color: var(--accent-color) !important;
}

.fc-event.event-secondary {
    background-color: var(--secondary-color) !important;
    border-color: var(--secondary-color) !important;
}

.fc-event:hover { 
    transform: translateY(-2px) scale(1.02); 
    box-shadow: var(--box-shadow); 
    z-index: 10;
}

.fc-event-title { 
    font-weight: 500;
    margin-bottom: 0.1em;
}

.fc-event-time {
    opacity: 0.8;
    font-size: 0.9em;
}

.fc-daygrid-event { 
    margin-top: 3px; 
    margin-bottom: 3px; 
}

/* Popover */
.popover {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    max-width: 320px;
}

.popover-header { 
    font-size: 1.1em; 
    font-weight: 600; 
    background-color: #f8fafc; 
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: calc(var(--border-radius) - 1px) calc(var(--border-radius) - 1px) 0 0;
}

.popover-body {
    padding: 1rem;
}

.event-popover-description { 
    font-size: 0.9em; 
    color: var(--text-color); 
    margin-top: 0.5rem; 
    white-space: pre-wrap; 
    max-width: 100%;
    line-height: 1.6;
}

.event-popover-time {
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 0.95em;
}

.event-popover-location {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.75rem;
    font-size: 0.9em;
    color: var(--text-muted-color);
}

.event-popover-location .bi {
    color: var(--primary-color);
}

/* --- Status Meldungen mit Animationen --- */
.form-text.text-danger { 
    font-weight: 500;
    color: #ef4444 !important;
    animation: fadeIn 0.3s ease-in;
}

.form-text.text-success { 
    font-weight: 500;
    color: #10b981 !important;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.alert { 
    box-shadow: var(--box-shadow); 
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    position: relative;
    animation: slideIn 0.4s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: #047857;
    border-left: 4px solid #10b981;
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: #b91c1c;
    border-left: 4px solid #ef4444;
}

.alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: #b45309;
    border-left: 4px solid #f59e0b;
}

.alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    color: #1d4ed8;
    border-left: 4px solid #3b82f6;
}

.alert .bi {
    margin-right: 0.5rem;
    font-size: 1.1em;
    vertical-align: -2px;
}

.alert-dismissible .btn-close {
    opacity: 0.5;
    transition: all var(--transition-normal);
}

.alert-dismissible .btn-close:hover {
    opacity: 1;
    transform: rotate(90deg);
}

/* --- Utility und Animationen --- */
.border-light-subtle { 
    border-color: #f1f5f9 !important; 
}

.shadow-hover {
    transition: all var(--transition-normal);
}

.shadow-hover:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-lg);
}

.section-fade-in {
    animation: fadeIn 1s ease-in;
}

.rotate-hover {
    transition: transform var(--transition-normal);
}

.rotate-hover:hover {
    transform: rotate(5deg);
}

.zoom-hover {
    transition: transform var(--transition-normal);
    overflow: hidden;
}

.zoom-hover:hover {
    transform: scale(1.05);
}

/* Farbige Badges */
.badge {
    font-weight: 600;
    padding: 0.35em 0.65em;
    border-radius: 0.375rem;
    text-transform: none;
    letter-spacing: 0.01em;
}

.badge-primary {
    background-color: var(--primary-color);
    color: white;
}

.badge-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.badge-accent {
    background-color: var(--accent-color);
    color: white;
}

.badge-outline-primary {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.badge-outline-secondary {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
    border: 1px solid var(--secondary-color);
}

/* Glasmorphismus-Container */
.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    position: relative;
    overflow: hidden;
}

.glass-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, rgba(255,255,255,0) 70%);
    opacity: 0.5;
    animation: glass-shine 8s linear infinite;
}

@keyframes glass-shine {
    0% { transform: translateY(0) translateX(0); }
    25% { transform: translateY(-30%) translateX(10%); }
    50% { transform: translateY(-15%) translateX(30%); }
    75% { transform: translateY(10%) translateX(15%); }
    100% { transform: translateY(0) translateX(0); }
}

/* Responsive Anpassungen für moderne Mobilgeräte */
@media (max-width: 991.98px) {
    .site-navbar .navbar-brand {
        font-size: 1.25rem;
    }
    
    .site-title {
        font-size: 1.75rem;
    }
    
    .site-navbar .nav-link {
        padding: 0.5rem 0.75rem;
    }
    
    .banner-content h1 {
        font-size: 2rem;
    }
    
    .fc .fc-toolbar-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 767.98px) {
    .site-title {
        font-size: 1.5rem;
    }
    
    .file-card:hover {
        transform: translateY(-5px);
    }
    
    .drop-zone-style {
        padding: 2rem 1rem;
    }
    
    .banner-content {
        max-width: 80%;
        bottom: 1.5rem;
        left: 1.5rem;
    }
    
    .banner-content h1 {
        font-size: 1.75rem;
        margin-bottom: 0.75rem;
    }

    .banner-content p {
        font-size: 1rem;
        margin-bottom: 1rem;
    }
    
    .fc .fc-toolbar.fc-header-toolbar {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    
    .fc .fc-toolbar-title {
        font-size: 1.25rem;
        text-align: center;
    }
}