/* Modern User Interface Styles */
.modern-input {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    border-radius: 8px !important;
    border: 2px solid #e1e5e9 !important;
    padding: 15px 16px !important;
    font-size: 16px !important;
    background: #fff !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08) !important;
    position: relative;
}

.modern-input:focus {
    border-color: #007bff !important;
    box-shadow: 0 0 0 4px rgba(0,123,255,0.15) !important;
    outline: none !important;
    transform: translateY(-1px);
}

.modern-input:valid {
    border-color: #28a745 !important;
}

.modern-input:invalid:not(:placeholder-shown) {
    border-color: #dc3545 !important;
}

.modern-btn {
    background: linear-gradient(45deg, #007bff, #0056b3) !important;
    border: none !important;
    border-radius: 8px !important;
    padding: 15px 24px !important;
    font-weight: 600 !important;
    color: white !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    cursor: pointer !important;
    font-size: 16px !important;
    box-shadow: 0 4px 15px rgba(0,123,255,0.3) !important;
    position: relative;
    overflow: hidden;
}

.modern-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.modern-btn:hover::before {
    left: 100%;
}

.modern-btn:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 25px rgba(0,123,255,0.4) !important;
}

.modern-btn:active {
    transform: translateY(0) !important;
    box-shadow: 0 2px 10px rgba(0,123,255,0.3) !important;
}

.modern-validation-message {
    animation: slideInUp 0.3s ease;
    font-weight: 500;
    letter-spacing: 0.5px;
}

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

.validation-success {
    border-left: 4px solid #28a745;
    background: linear-gradient(90deg, #d4edda, #c3e6cb);
}

.validation-error {
    border-left: 4px solid #dc3545;
    background: linear-gradient(90deg, #f8d7da, #f5c6cb);
}

/* Tab styling */
.nav-tabs {
    display: flex !important;
    border-bottom: none !important;
}

.nav-tabs > li {
    flex: 1 !important;
}

.nav-tabs > li > a {
    border-radius: 0 !important;
    margin-right: 0 !important;
    border: none !important;
    position: relative !important;
}

.nav-tabs > li.active > a,
.nav-tabs > li.active > a:focus,
.nav-tabs > li.active > a:hover {
    background: white !important;
    border: none !important;
    position: relative !important;
}

.nav-tabs > li.active > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(45deg, #667eea, #764ba2);
}

/* Modal enhancements */
.modal-content {
    border: none !important;
    border-radius: 20px !important;
    overflow: hidden !important;
    box-shadow: 0 25px 50px rgba(0,0,0,0.25) !important;
}

.modal-backdrop.in {
    background: rgba(0,0,0,0.6) !important;
    backdrop-filter: blur(5px) !important;
}

/* Form group spacing */
.form-group {
    margin-bottom: 25px !important;
    position: relative !important;
}

.form-group label {
    font-weight: 600 !important;
    color: #495057 !important;
    margin-bottom: 8px !important;
    display: block !important;
    font-size: 14px !important;
    letter-spacing: 0.5px !important;
}

/* Responsive design */
@media (max-width: 768px) {
    .modal-dialog {
        margin: 20px !important;
        width: auto !important;
    }
    
    .modern-input {
        padding: 12px 14px !important;
        font-size: 16px !important;
    }
    
    .modern-btn {
        padding: 12px 20px !important;
        font-size: 15px !important;
    }
}

/* Loading state */
.btn-loading {
    position: relative !important;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

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

/* Focus visible for accessibility */
.modern-input:focus-visible,
.modern-btn:focus-visible {
    outline: 2px solid #007bff !important;
    outline-offset: 2px !important;
}