/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-color);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Touch-friendly tap targets */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .diagnosis-card,
    .checkbox-label {
        min-height: 44px;
        min-width: 44px;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow-md);
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Progress Indicator */
.progress-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin: 2rem 0;
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    margin-bottom: 2rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    width: 20%;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

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

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    position: relative;
    z-index: 1;
}

.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;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.step.active .step-number {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

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

.step-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    font-weight: 500;
}

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

/* Main Content */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

.referral-form {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.form-step {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.form-step.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.form-step h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-size: 1rem;
}

/* Diagnosis Cards */
.diagnosis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.diagnosis-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.diagnosis-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.1), transparent);
    transition: left 0.5s;
}

.diagnosis-card:hover::before {
    left: 100%;
}

.diagnosis-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px) scale(1.02);
}

.diagnosis-card.active {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15), var(--shadow-lg);
    transform: translateY(-2px);
}

.diagnosis-card.active::after {
    content: '✓';
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.875rem;
    animation: checkmark 0.3s ease;
}

@keyframes checkmark {
    0% {
        transform: scale(0) rotate(0deg);
    }
    50% {
        transform: scale(1.2) rotate(180deg);
    }
    100% {
        transform: scale(1) rotate(360deg);
    }
}

.diagnosis-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.diagnosis-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.diagnosis-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin: 0;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: white;
}

.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.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--danger-color);
    background: #fef2f2;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-group input:valid:not(:placeholder-shown),
.form-group select:valid:not([value=""]),
.form-group textarea:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

.form-group .field-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

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

/* Checkbox Groups */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.checkbox-group.error {
    border-color: var(--danger-color);
    background: #fef2f2;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.checkbox-label:hover {
    background: rgba(37, 99, 235, 0.05);
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.checkbox-label span {
    font-size: 0.9375rem;
    color: var(--text-primary);
}

/* Advice Section */
.advice-section {
    background: #eff6ff;
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.advice-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.advice-section ul {
    list-style: none;
    padding-left: 0;
}

.advice-section li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.advice-section li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.advice-section p {
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

/* Review Section */
.review-section {
    margin-top: 2rem;
}

.review-content {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.review-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.review-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.review-item label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: block;
    margin-bottom: 0.5rem;
}

.review-item .value {
    font-size: 1rem;
    color: var(--text-primary);
    word-wrap: break-word;
}

.review-item .value:empty:before {
    content: "—";
    color: var(--text-secondary);
    font-style: italic;
}

/* Buttons */
.btn {
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1e3a8a 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -2px rgba(37, 99, 235, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px -1px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #475569 100%);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(100, 116, 139, 0.3);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #475569 0%, #334155 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -2px rgba(100, 116, 139, 0.4);
}

.btn-secondary:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px -1px rgba(100, 116, 139, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn-icon-left,
.btn-icon-right {
    font-size: 1.125rem;
    transition: transform 0.3s ease;
}

.btn:hover .btn-icon-right {
    transform: translateX(3px);
}

.btn:hover .btn-icon-left {
    transform: translateX(-3px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-icon {
    font-size: 1.25rem;
}

.form-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

.download-section {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Validation Message */
.validation-message {
    margin-top: 1rem;
    padding: 1rem;
    background: #fef2f2;
    border-left: 4px solid var(--danger-color);
    border-radius: var(--border-radius);
    color: var(--danger-color);
    font-weight: 500;
    animation: slideDown 0.3s ease;
}

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

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--text-primary) 0%, #0f172a 100%);
    color: white;
    text-align: center;
    padding: 2.5rem 0;
    margin-top: 4rem;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
}

.footer p {
    opacity: 0.9;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.developer-credit {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.875rem;
    opacity: 0.85;
}

.developer-credit strong {
    font-weight: 600;
    color: white;
    opacity: 1;
}

/* Loading State */
.btn.loading {
    position: relative;
    color: transparent;
    pointer-events: none;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Focus Visible for Accessibility */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .diagnosis-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }

    .diagnosis-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .progress-steps {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .step {
        flex: 0 0 calc(50% - 0.375rem);
    }

    .step-label {
        font-size: 0.7rem;
    }
    
    .step-number {
        width: 36px;
        height: 36px;
        font-size: 0.875rem;
    }

    .referral-form {
        padding: 1.25rem;
    }

    .logo {
        font-size: 1.5rem;
    }
    
    .tagline {
        font-size: 0.9rem;
    }

    .form-step h2 {
        font-size: 1.5rem;
        margin-bottom: 0.75rem;
    }
    
    .step-description {
        font-size: 0.9375rem;
        margin-bottom: 1.5rem;
    }

    .form-navigation {
        flex-direction: column;
        gap: 0.75rem;
    }

    .btn {
        width: 100%;
        justify-content: center;
        padding: 1rem 1.5rem;
    }

    .download-section {
        flex-direction: column;
        gap: 0.75rem;
    }

    .download-section .btn {
        width: 100%;
    }
    
    .diagnosis-card {
        padding: 1.5rem 1rem;
    }
    
    .diagnosis-icon {
        font-size: 2.5rem;
    }
    
    .diagnosis-card h3 {
        font-size: 1.125rem;
    }
    
    .progress-container {
        padding: 1.5rem;
    }
    
    .header {
        padding: 1.5rem 0;
    }
    
    .main-content {
        padding: 1.5rem 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .referral-form {
        padding: 1rem;
    }

    .progress-container {
        padding: 1.25rem;
    }

    .step-number {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }
    
    .step-label {
        font-size: 0.65rem;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .form-step h2 {
        font-size: 1.25rem;
    }
    
    .diagnosis-card {
        padding: 1.25rem 0.75rem;
    }
    
    .diagnosis-icon {
        font-size: 2rem;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 0.625rem;
        font-size: 0.9375rem;
    }
    
    .advice-section {
        padding: 1.25rem;
    }
    
    .review-content {
        padding: 1.25rem;
    }
    
    .footer {
        padding: 2rem 0;
    }
    
    .footer p {
        font-size: 0.8125rem;
    }
    
    .developer-credit {
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .referral-form {
        padding: 1rem;
    }

    .progress-container {
        padding: 1.5rem;
    }

    .step-number {
        width: 35px;
        height: 35px;
        font-size: 0.875rem;
    }
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .progress-container,
    .form-navigation,
    .download-section {
        display: none;
    }

    .form-step {
        display: block !important;
    }
}