/* Allgemeine Stile */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

h1 {
    font-size: 2.5em;
    color: #2c3e50;
    text-align: center;
    margin-bottom: 20px;
    font-weight: 700;
}

/* Container für die Startseite */
.container {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    max-width: 800px;
    margin: 0 auto;
}

/* Suchformular auf Startseite */
.container form {
    max-width: 100%;
    margin: 20px 0;
    padding: 0;
    border: none;
    background: transparent;
}

.container form input[type="search"] {
    padding: 12px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.container form input[type="search"]:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
}

/* Buttons auf Startseite */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    padding: 10px 30px;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-outline-primary {
    border: 2px solid #667eea;
    color: #667eea;
    border-radius: 25px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.btn-outline-secondary {
    border: 2px solid #6c757d;
    color: #6c757d;
    border-radius: 25px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover {
    background: #6c757d;
    color: white;
    transform: translateY(-2px);
}

.btn-outline-danger {
    border: 2px solid #dc3545;
    color: #dc3545;
    border-radius: 25px;
    padding: 8px 20px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-outline-danger:hover {
    background: #dc3545;
    color: white;
    transform: translateY(-2px);
}

/* Auth Container für Login/Register */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 450px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.auth-icon {
    font-size: 3.5em;
    color: #667eea;
    margin-bottom: 15px;
    display: block;
}

.auth-title {
    font-size: 2em;
    color: #2c3e50;
    margin-bottom: 8px;
    font-weight: 700;
}

.auth-subtitle {
    color: #7f8c8d;
    font-size: 1.1em;
    margin: 0;
}

.auth-input {
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.3s ease;
}

.auth-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
}

.auth-btn {
    padding: 14px 30px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 10px;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.auth-btn-outline {
    padding: 12px 30px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 10px;
    transition: all 0.3s ease;
    border: 2px solid;
}

.auth-btn-outline:hover {
    transform: translateY(-2px);
}

.auth-footer {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px solid #f0f0f0;
}

.auth-footer p {
    color: #7f8c8d;
    font-size: 14px;
}

/* Alerts */
.alert {
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    border: none;
}

.alert-danger {
    background: #fee;
    color: #c33;
}

.alert-success {
    background: #efe;
    color: #3c3;
}

/* Altes #btn für Kompatibilität */
#btn {
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 10px;
    padding: 12px 20px;
    cursor: pointer;
    display: block;
    margin: 0 auto;
    font-weight: 600;
    transition: all 0.3s ease;
}

#btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

/* ===== Buchverwaltung Styles ===== */

/* Management Container */
.book-management-container {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    max-width: 1000px;
    margin: 0 auto;
}

/* Formular Card */
.book-form-card {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 30px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.book-form-card:hover {
    border-color: #667eea;
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.1);
}

/* Input Felder */
.book-input {
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s ease;
}

.book-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    outline: none;
    background: white;
}

/* Form Labels */
.form-label {
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-label i {
    margin-right: 5px;
}

/* Switch für Verfügbarkeit */
.book-switch {
    width: 3em;
    height: 1.5em;
    cursor: pointer;
}

.book-switch:checked {
    background-color: #28a745;
    border-color: #28a745;
}

.book-switch:focus {
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

/* Success Button */
.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    border: none;
    padding: 10px 25px;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.5);
}

/* Gefahrenzone */
.danger-zone {
    background: #fff5f5;
    border: 2px solid #fc8181;
    border-radius: 12px;
    padding: 25px;
    margin-top: 40px;
}

.danger-zone h3 {
    color: #c53030;
    font-size: 1.3em;
    margin-bottom: 10px;
}

.danger-zone p {
    color: #742a2a;
    margin-bottom: 15px;
}

/* Card Styles für Bücherübersicht */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-body {
    padding: 20px;
}

.card-title {
    color: #2c3e50;
    font-weight: 700;
    font-size: 1.2em;
    margin-bottom: 10px;
}

.card-subtitle {
    color: #6c757d;
    font-size: 0.95em;
}

.card-footer {
    padding: 15px 20px;
    background: transparent;
}

/* Badges */
.badge {
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.85em;
}

/* Button Styles */
.btn {
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
}

.btn-lg {
    padding: 12px 30px;
    font-size: 16px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}

.btn-outline-primary {
    border: 2px solid #667eea;
    color: #667eea;
}

.btn-outline-primary:hover {
    background: #667eea;
    color: white;
    transform: translateY(-1px);
}

.btn-outline-secondary {
    border: 2px solid #6c757d;
    color: #6c757d;
}

.btn-outline-secondary:hover {
    background: #6c757d;
    color: white;
    transform: translateY(-1px);
}

.btn-outline-danger {
    border: 2px solid #dc3545;
    color: #dc3545;
}

.btn-outline-danger:hover {
    background: #dc3545;
    color: white;
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.5);
}

/* Modal Styles */
.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
    border-radius: 15px 15px 0 0;
    padding: 20px 25px;
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 20px 25px;
    border-top: 2px solid #e9ecef;
}

/* Alert Improvements */
.alert {
    border-radius: 10px;
    padding: 15px 20px;
    margin-bottom: 20px;
    border: none;
    animation: slideDown 0.3s ease;
}

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

.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    color: #856404;
    border-left: 4px solid #ffc107;
}

/* Icons */
i.bi {
    vertical-align: middle;
}

/* Input Group */
.input-group {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    border-radius: 8px;
    overflow: hidden;
}

.input-group .form-control {
    border: 2px solid #e0e0e0;
    padding: 12px 20px;
}

.input-group .form-control:focus {
    border-color: #667eea;
    box-shadow: none;
}

.input-group .btn {
    border-radius: 0;
    padding: 12px 25px;
}

.input-group .btn:last-child {
    border-radius: 0 8px 8px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .book-management-container {
        padding: 20px;
    }
    
    .book-form-card {
        padding: 20px;
    }
    
    h1 {
        font-size: 1.8em;
    }
    
    .btn-lg {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* Hover Effects für Cards */
.card-footer .btn {
    transition: all 0.2s ease;
}

.card-footer .btn:hover {
    transform: scale(1.05);
}

/* Secondary Button */
.btn-secondary {
    background: #6c757d;
    border: none;
    box-shadow: 0 2px 10px rgba(108, 117, 125, 0.3);
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(108, 117, 125, 0.4);
}