/* Main Application Styles */
:root {
    --primary-color: #1e3c72;
    --primary-light: #2a5298;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #212529;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* Modern Container */
.registration-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 25px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    overflow: hidden;
}

.registration-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: 40px;
    text-align: center;
    position: relative;
}

.registration-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.registration-body {
    padding: 40px;
    background: white;
}

/* Modern Form Styles */
.form-section {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 25px;
    border: 1px solid #e9ecef;
}

.section-title {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-light);
    display: flex;
    align-items: center;
    gap: 10px;
}

.modern-input {
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 15px 20px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: #fdfdfd;
}

.modern-input:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 0.2rem rgba(42, 82, 152, 0.15);
    background: white;
    outline: none;
}

.modern-input:valid {
    border-color: var(--success-color);
}

.modern-select {
    border: 2px solid #e9ecef;
    border-radius: 12px;
    padding: 15px 20px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: #fdfdfd;
    cursor: pointer;
}

.modern-select:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 0.2rem rgba(42, 82, 152, 0.15);
    background: white;
    outline: none;
}

.form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.required-field::after {
    content: " *";
    color: var(--danger-color);
    font-weight: bold;
}

/* Modern Button Styles */
.btn-modern {
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    padding: 15px 30px;
    transition: all 0.3s ease;
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn-primary-modern {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(30, 60, 114, 0.3);
}

.btn-primary-modern:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(30, 60, 114, 0.4);
    color: white;
}

.btn-secondary-modern {
    background: linear-gradient(135deg, #6c757d 0%, #5a6268 100%);
    color: white;
}

.btn-secondary-modern:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 117, 125, 0.3);
    color: white;
}

/* File Upload Styles */
.file-upload-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

.file-upload-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-upload-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 20px;
    border: 2px dashed #e9ecef;
    border-radius: 12px;
    background: #fdfdfd;
    color: #6c757d;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
}

.file-upload-button:hover {
    border-color: var(--primary-light);
    background: #f8f9fa;
    color: var(--primary-color);
}

.file-upload-button.has-file {
    border-color: var(--success-color);
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

/* Animations */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-section {
    animation: slideInUp 0.6s ease-out;
}

.form-section:nth-child(1) { animation-delay: 0.1s; }
.form-section:nth-child(2) { animation-delay: 0.2s; }
.form-section:nth-child(3) { animation-delay: 0.3s; }
.form-section:nth-child(4) { animation-delay: 0.4s; }

/* Responsive Design */
@media (max-width: 768px) {
    .registration-container {
        margin: 10px;
        border-radius: 20px;
    }
    
    .registration-header,
    .registration-body {
        padding: 25px;
    }
    
    .form-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .modern-input,
    .modern-select {
        padding: 12px 15px;
        font-size: 14px;
    }
    
    .btn-modern {
        width: 100%;
        padding: 12px 25px;
        font-size: 14px;
    }
}

/* Loading Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .btn-lg {
        padding: 0.625rem 1.25rem;
        font-size: 1rem;
    }
}

/* Footer */
footer {
    margin-top: auto;
}

/* Alert Styles */
.alert {
    border-radius: 0.5rem;
    border: none;
}

.alert-dismissible .btn-close {
    padding: 1rem;
}

/* Form Text */
.form-text {
    color: #6c757d;
    font-size: 0.875rem;
}

/* Enhanced Validation Styles */
.form-control.is-invalid,
.form-select.is-invalid {
    border-color: var(--danger-color) !important;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25) !important;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23dc3545'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath d='m5.8 3.6.7.7-1.4 1.4'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-invalid:focus,
.form-select.is-invalid:focus {
    border-color: var(--danger-color) !important;
    box-shadow: 0 0 0 0.25rem rgba(220, 53, 69, 0.25) !important;
}

.required-field::after {
    content: " *";
    color: var(--danger-color);
    font-weight: bold;
}

/* Validation Alert Enhancements */
.alert ul {
    margin-bottom: 0;
    padding-left: 1.5rem;
}

.alert li {
    margin-bottom: 0.25rem;
}

/* Loading State for Submit Button */
.btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* Focus States for Better Accessibility */
.modern-input:focus,
.modern-select:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.2);
    border-color: var(--primary-color);
}

/* Valid Input States */
.form-control.is-valid,
.form-select.is-valid {
    border-color: var(--success-color) !important;
    box-shadow: 0 0 0 0.25rem rgba(40, 167, 69, 0.25) !important;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='m2.3 6.73.8-.78-.8-.79-.8.79zm1.34-3.27L6.7.42 6 0l-2.59 2.58L2.14 1.31l-.7.71z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-valid:focus,
.form-select.is-valid:focus {
    border-color: var(--success-color) !important;
    box-shadow: 0 0 0 0.25rem rgba(40, 167, 69, 0.25) !important;
}