/* ========================================
   CSS Variables & Design System
======================================== */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-elevated: #22222e;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6a6a7a;
    
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    --band-red: #ef4444;
    --band-yellow: #f59e0b;
    --band-green: #10b981;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ========================================
   Reset & Base Styles
======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Gradient background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ========================================
   App Container
======================================== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ========================================
   Header
======================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-primary);
}

/* ========================================
   Main Content
======================================== */
.main-content {
    flex: 1;
    padding: var(--spacing-xl);
}

.screen {
    display: none;
    animation: fadeIn var(--transition-slow);
}

.screen.active {
    display: block;
}

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

/* ========================================
   Welcome Screen
======================================== */
.welcome-card {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-2xl);
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.welcome-card h1 {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xl);
}

.info-form {
    text-align: left;
    margin-bottom: var(--spacing-xl);
}

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

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.welcome-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   Buttons
======================================== */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 50px rgba(99, 102, 241, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-card);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-secondary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1.1rem;
}

.btn-arrow {
    font-size: 1.25rem;
    transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

.btn-secondary:hover .btn-arrow {
    transform: translateX(-4px);
}

.hidden {
    display: none !important;
}

/* ========================================
   Survey Screen
======================================== */
.survey-container {
    max-width: 800px;
    margin: 0 auto;
}

/* Progress Bar */
.progress-container {
    margin-bottom: var(--spacing-lg);
}

.progress-bar {
    height: 8px;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width var(--transition-normal);
}

.progress-text {
    text-align: center;
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Section Tabs */
.section-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
}

.section-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.section-tab:hover {
    background: var(--bg-elevated);
}

.section-tab.active {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.section-tab.completed {
    border-color: var(--success);
}

.section-tab.completed::after {
    content: '✓';
    color: var(--success);
    margin-left: var(--spacing-sm);
}

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

/* Questions */
.questions-container {
    min-height: 400px;
}

.question-card {
    display: none;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    animation: slideIn var(--transition-normal);
}

.question-card.active {
    display: block;
}

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

.question-header {
    margin-bottom: var(--spacing-lg);
}

.question-number {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.question-text {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--spacing-md);
}

.question-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.meta-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.meta-tag.urgency-critical {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.meta-tag.urgency-high {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.meta-tag.frequency {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-primary);
}

.question-why {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(99, 102, 241, 0.05);
    border-left: 3px solid var(--accent-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-item {
    position: relative;
}

.option-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.option-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-label:hover {
    background: var(--bg-elevated);
    border-color: rgba(255, 255, 255, 0.1);
}

.option-input:checked + .option-label {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--accent-primary);
}

.option-radio {
    width: 20px;
    height: 20px;
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.option-input:checked + .option-label .option-radio {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
}

.option-input:checked + .option-label .option-radio::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
}

.option-text {
    flex: 1;
    font-size: 0.95rem;
}

.option-score {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Navigation */
.survey-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ========================================
   Results Screen
======================================== */
.results-container {
    max-width: 700px;
    margin: 0 auto;
}

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.results-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    animation: bounce 1s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.results-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.results-subtitle {
    color: var(--text-secondary);
}

/* Overall Score Card */
.overall-score-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-2xl);
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.overall-score-card.band-red {
    box-shadow: 0 0 40px rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.overall-score-card.band-yellow {
    box-shadow: 0 0 40px rgba(245, 158, 11, 0.2);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.overall-score-card.band-green {
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.2);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.score-ring {
    position: relative;
    width: 160px;
    height: 160px;
    margin-bottom: var(--spacing-lg);
}

.score-ring svg {
    transform: rotate(-90deg);
}

.score-ring-bg {
    fill: none;
    stroke: var(--bg-secondary);
    stroke-width: 10;
}

.score-ring-fill {
    fill: none;
    stroke: var(--accent-primary);
    stroke-width: 10;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 1.5s ease;
}

.band-red .score-ring-fill { stroke: var(--band-red); }
.band-yellow .score-ring-fill { stroke: var(--band-yellow); }
.band-green .score-ring-fill { stroke: var(--band-green); }

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: baseline;
}

.score-number {
    font-size: 3rem;
    font-weight: 800;
}

.score-percent {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.score-label {
    text-align: center;
}

.score-badge {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.band-red .score-badge {
    background: rgba(239, 68, 68, 0.15);
    color: var(--band-red);
}

.band-yellow .score-badge {
    background: rgba(245, 158, 11, 0.15);
    color: var(--band-yellow);
}

.band-green .score-badge {
    background: rgba(16, 185, 129, 0.15);
    color: var(--band-green);
}

.score-description {
    display: block;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Section Scores */
.section-scores {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.section-score-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.section-score-card:hover {
    transform: translateX(4px);
}

.section-score-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.section-score-icon {
    font-size: 1.5rem;
}

.section-score-title {
    font-weight: 600;
}

.section-score-bar {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.section-bar-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    transition: width 1s ease;
}

.section-bar-fill.band-red { background: var(--band-red); }
.section-bar-fill.band-yellow { background: var(--band-yellow); }
.section-bar-fill.band-green { background: var(--band-green); }

.section-score-value {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
}

.section-badge {
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.section-badge.band-red {
    background: rgba(239, 68, 68, 0.15);
    color: var(--band-red);
}

.section-badge.band-yellow {
    background: rgba(245, 158, 11, 0.15);
    color: var(--band-yellow);
}

.section-badge.band-green {
    background: rgba(16, 185, 129, 0.15);
    color: var(--band-green);
}

/* Recommendations */
.recommendations-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.recommendations-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

.recommendations-card ul {
    list-style: none;
}

.recommendations-card li {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    gap: var(--spacing-md);
}

.recommendations-card li:last-child {
    border-bottom: none;
}

.recommendations-card li::before {
    content: '→';
    color: var(--accent-primary);
    font-weight: bold;
}

/* Results Actions */
.results-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* ========================================
   Footer
======================================== */
.footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .welcome-card h1 {
        font-size: 1.75rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .welcome-stats {
        gap: var(--spacing-lg);
    }
    
    .section-tabs {
        flex-wrap: nowrap;
    }
    
    .section-tab {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.75rem;
    }
    
    .tab-text {
        display: none;
    }
    
    .question-card {
        padding: var(--spacing-lg);
    }
    
    .question-text {
        font-size: 1.1rem;
    }
    
    .survey-navigation {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
    
    .survey-navigation button {
        flex: 1;
        min-width: 120px;
    }
    
    .score-ring {
        width: 140px;
        height: 140px;
    }
    
    .score-number {
        font-size: 2.5rem;
    }
}

@media (max-width: 480px) {
    .header-badge {
        display: none;
    }
    
    .welcome-card {
        padding: var(--spacing-lg);
    }
    
    .welcome-icon {
        font-size: 3rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
}