* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --success-color: #059669;
    --error-color: #dc2626;
    --warning-color: #d97706;
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
    overflow: hidden;
}

.header-content {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
}

.logo h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* Progress Bar Styles */
.progress-container {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 30px;
    margin-bottom: 30px;
}

.progress-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    margin-bottom: 30px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 3px;
    width: 20%;
    transition: var(--transition);
}

.progress-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    flex: 1;
    max-width: 120px;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
}

.step.active .step-number {
    background: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.step.completed .step-number {
    background: var(--success-color);
    color: white;
}

.step-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-align: center;
    transition: var(--transition);
}

.step.active .step-label {
    color: var(--primary-color);
    font-weight: 600;
}

/* Form Styles */
.form-container {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.form-step {
    display: none;
    padding: 40px 30px;
    animation: fadeIn 0.5s ease-in-out;
}

.form-step.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.step-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.step-header h2 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.step-header i {
    color: var(--primary-color);
}

.step-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.required {
    color: var(--error-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--surface-color);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    transform: translateY(-1px);
}

.form-group input:invalid:not(:placeholder-shown),
.form-group select:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.error-message {
    color: var(--error-color);
    font-size: 0.8rem;
    margin-top: 4px;
    min-height: 20px;
}

/* Upload Styles */
.upload-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.upload-item {
    margin-bottom: 20px;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    background: var(--background-color);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    min-height: 150px;
}

.upload-label:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
    transform: translateY(-2px);
}

.upload-label i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.upload-label span {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.upload-info {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.upload-label input[type="file"] {
    display: none;
}

/* Summary Styles */
.summary-section {
    background: var(--background-color);
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 30px;
}

.summary-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.summary-content {
    display: grid;
    gap: 15px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.summary-item:last-child {
    border-bottom: none;
}

.summary-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.summary-value {
    font-weight: 500;
    color: var(--text-primary);
    text-align: right;
}

/* Consent Styles */
.consent-section {
    background: var(--background-color);
    border-radius: var(--border-radius);
    padding: 25px;
    margin-bottom: 30px;
}

.consent-item {
    margin-bottom: 15px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
    font-size: 0.95rem;
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: var(--surface-color);
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
    margin-top: 2px;
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
}

/* Button Styles */
.form-navigation {
    padding: 30px;
    background: var(--background-color);
    display: flex;
    justify-content: space-between;
    gap: 15px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    min-width: 120px;
    justify-content: center;
}

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

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

.btn-secondary:hover {
    background: #475569;
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #047857;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    animation: fadeIn 0.3s ease-in-out;
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 30px 30px 0;
    text-align: center;
}

.modal-header h2 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--success-color);
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.modal-body {
    padding: 20px 30px;
    text-align: center;
    line-height: 1.6;
}

.modal-footer {
    padding: 20px 30px 30px;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header-content {
        padding: 30px 20px;
    }

    .logo h1 {
        font-size: 1.8rem;
    }

    .progress-container {
        padding: 20px;
    }

    .progress-steps {
        flex-wrap: wrap;
        gap: 15px;
    }

    .step {
        max-width: none;
        min-width: 80px;
    }

    .step-number {
        width: 35px;
        height: 35px;
        font-size: 0.8rem;
    }

    .step-label {
        font-size: 0.7rem;
    }

    .form-step {
        padding: 30px 20px;
    }

    .step-header h2 {
        font-size: 1.5rem;
        flex-direction: column;
        gap: 8px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .upload-grid {
        grid-template-columns: 1fr;
    }

    .upload-label {
        padding: 25px 15px;
        min-height: 120px;
    }

    .form-navigation {
        padding: 20px;
        flex-direction: column;
        gap: 10px;
    }

    .btn {
        width: 100%;
    }

    .modal-content {
        width: 95%;
        margin: 20px;
    }

    .modal-header,
    .modal-body,
    .modal-footer {
        padding-left: 20px;
        padding-right: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    .header-content {
        padding: 25px 15px;
    }

    .logo {
        flex-direction: column;
        gap: 10px;
    }

    .logo h1 {
        font-size: 1.6rem;
    }

    .progress-container {
        padding: 15px;
    }

    .form-step {
        padding: 25px 15px;
    }

    .step-header {
        margin-bottom: 30px;
    }

    .summary-section,
    .consent-section {
        padding: 20px;
    }

    .form-navigation {
        padding: 15px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }

    .container {
        max-width: none;
        padding: 0;
    }

    .header {
        box-shadow: none;
        page-break-inside: avoid;
    }

    .progress-container,
    .form-navigation {
        display: none;
    }

    .form-step {
        display: block !important;
        page-break-inside: avoid;
        padding: 20px 0;
    }

    .form-step + .form-step {
        page-break-before: always;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}