/* CSS Variables for Easy Customization */
:root {
    /* Colors - matching matrx.ai dark/blue theme */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --secondary: #22d3ee;
    --accent: #60a5fa;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-surface: #334155;
    --bg-card: #475569;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --border: #475569;
    --border-light: #64748b;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Shadows */
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Landing Page Styles */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: calc(var(--spacing-lg) * 0.4) var(--spacing-lg);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-lg) * 0.4) 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: calc(var(--spacing-2xl) * 0.4);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary);
}

.hero {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 120px); /* Account for header height */
    text-align: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.highlight {
    color: var(--primary);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
}

.cta-section {
    text-align: center;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

.cta-button.secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.cta-button.secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.cta-note {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    max-width: 100%;
}

/* Features Section */
.features {
    margin-top: calc(var(--spacing-2xl) * 0.4);
    padding-bottom: var(--spacing-2xl);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-light);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 50%;
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 18px;
    height: 18px;
}

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

/* Questionnaire Styles */
.questionnaire-body {
    background: var(--bg-primary);
}

.questionnaire-container {
    max-width: 800px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.questionnaire-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.progress-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.progress-bar {
    width: 200px;
    height: 8px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-md);
    transition: width var(--transition-normal);
    width: 12.5%;
}

.progress-text {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    font-weight: 500;
    min-width: 60px;
}

.questionnaire-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.question-container {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    backdrop-filter: blur(10px);
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.question {
    opacity: 0;
    transform: translateX(20px);
    transition: all var(--transition-normal);
}

.question.active {
    opacity: 1;
    transform: translateX(0);
}

.question-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.question-subtitle {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.radio-option {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.radio-option:hover {
    background: var(--bg-surface);
    border-color: var(--border-light);
}

.radio-option.selected {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary);
}

.radio-option input[type="radio"] {
    margin-right: var(--spacing-md);
    accent-color: var(--primary);
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.checkbox-option {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.checkbox-option:hover {
    background: var(--bg-surface);
    border-color: var(--border-light);
}

.checkbox-option.selected {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary);
}

.checkbox-option input[type="checkbox"] {
    margin-right: var(--spacing-md);
    accent-color: var(--primary);
}

.navigation-container {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.nav-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 120px;
    justify-content: center;
}

.nav-button.primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.nav-button.primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    transform: translateY(-1px);
}

.nav-button.secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.nav-button.secondary:hover {
    background: var(--bg-card);
    border-color: var(--border-light);
}

.nav-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Completion Screen */
.completion-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.completion-content {
    text-align: center;
    max-width: 500px;
    padding: var(--spacing-2xl);
}

.completion-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 50%;
    margin-bottom: var(--spacing-xl);
    color: white;
}

.completion-content h2 {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.completion-content p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.completion-actions {
    margin-top: var(--spacing-xl);
}

/* Results Screen Styles */
.results-content {
    max-width: 600px;
    margin: 0 auto;
}

.results-disclaimer {
    margin-bottom: var(--spacing-xl);
}

.disclaimer-box {
    background: rgba(30, 64, 175, 0.1);
    border: 1px solid rgba(30, 64, 175, 0.2);
    border-radius: 12px;
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.disclaimer-box svg {
    color: var(--primary);
    margin-top: 2px;
    flex-shrink: 0;
}

.disclaimer-box p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.5;
}

.results-section {
    background: var(--surface);
    border-radius: 12px;
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
}

.results-section h3 {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-lg) 0;
}

.financing-recommendation {
    background: rgba(30, 64, 175, 0.1);
    border-radius: 8px;
    padding: var(--spacing-lg);
    border-left: 4px solid var(--primary);
}

.recommendation-item {
    color: var(--text-primary);
    font-size: 1.1rem;
    line-height: 1.4;
}

.recommendation-item strong {
    color: #3b82f6;
    font-weight: 700;
    font-size: 1.2rem;
}

/* Desktop Layout */
@media (min-width: 769px) {
    .feature-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-xl);
    }
    
    .feature-card {
        padding: var(--spacing-xl);
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        margin-bottom: var(--spacing-lg);
    }
    
    .feature-icon svg {
        width: 24px;
        height: 24px;
    }
    
    .feature-card h3 {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-md);
    }
    
    .feature-card p {
        font-size: var(--font-size-base);
    }
    
    .features {
        margin-top: var(--spacing-3xl);
        padding-bottom: var(--spacing-3xl);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .header {
        padding: var(--spacing-sm) 0;
        margin-bottom: var(--spacing-md);
    }
    
    .features {
        margin-top: var(--spacing-md);
        padding-bottom: var(--spacing-md);
    }
    
    .hero {
        text-align: center;
        min-height: auto;
        padding: var(--spacing-md) 0;
    }
    
    .hero-title {
        font-size: 2.2rem;
        margin-bottom: var(--spacing-sm);
        line-height: 1.1;
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-sm);
    }
    
    .cta-section {
        margin: var(--spacing-sm) 0;
    }
    
    .cta-button {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }
    
    .cta-note {
        margin-top: var(--spacing-sm);
        font-size: 0.8rem;
    }
    
    .questionnaire-header {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .progress-container {
        width: 100%;
        justify-content: center;
    }
    
    .progress-bar {
        flex: 1;
        max-width: 300px;
    }
    
    .questionnaire-main {
        padding: var(--spacing-lg);
    }
    
    .question-container {
        padding: var(--spacing-lg);
        min-height: 250px;
    }
    
    .question-title {
        font-size: var(--font-size-xl);
    }
    
    .navigation-container {
        flex-direction: column;
    }
    
    .nav-button {
        width: 100%;
    }
    
    /* Keep 2x2 grid on mobile for compact layout */
}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-xs) 0;
        margin-bottom: var(--spacing-sm);
    }
    
    .hero {
        padding: var(--spacing-xs) 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-sm);
        margin-bottom: var(--spacing-xs);
    }
    
    .cta-button {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.9rem;
    }
    
    .cta-note {
        margin-top: var(--spacing-xs);
        font-size: 0.75rem;
    }
    
    .features {
        margin-top: var(--spacing-sm);
        padding-bottom: var(--spacing-sm);
    }
    
    .feature-card {
        padding: var(--spacing-sm);
    }
    
    .feature-icon {
        width: 32px;
        height: 32px;
        margin-bottom: var(--spacing-xs);
    }
    
    .feature-icon svg {
        width: 16px;
        height: 16px;
    }
    
    .feature-card h3 {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-xs);
    }
    
    .feature-card p {
        font-size: 0.8rem;
        line-height: 1.3;
    }
    
    .questionnaire-main {
        padding: var(--spacing-md);
    }
    
    .question-container {
        padding: var(--spacing-md);
        min-height: 200px;
    }
    
    .completion-content {
        padding: var(--spacing-lg);
    }
}

/* Animation Classes */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp var(--transition-normal) ease-out;
}

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

.slide-in-right {
    animation: slideInRight var(--transition-normal) ease-out;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}