@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

/* ========================================
   CSS VARIABLES & DESIGN TOKENS
   ======================================== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-critical: #ef4444;
    
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #4b5563;
    --color-text-light: #6b7280;
    
    --color-bg: #ffffff;
    --color-bg-section: #fafafa;
    --color-bg-hover: #f3f4f6;
    --color-border: #e5e7eb;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --line-height: 1.6;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* 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);
}

/* ========================================
   BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text-primary);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   CONTAINER & LAYOUT
   ======================================== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

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

.section.active {
    display: block;
}

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

/* ========================================
   BRANDING
   ======================================== */
.brand {
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 2px;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.brand-small {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1 {
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 700;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

h2 {
    font-size: clamp(24px, 4vw, 32px);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

h3 {
    font-size: clamp(18px, 3vw, 24px);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: var(--font-size-large);
    color: var(--color-text-secondary);
    text-align: center;
    font-style: italic;
    margin-bottom: var(--spacing-2xl);
}

/* ========================================
   LANDING SECTION
   ======================================== */
.intro-box {
    background: var(--color-bg-section);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-2xl);
}

.intro-box p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.intro-box p:last-child {
    margin-bottom: 0;
}

.intro-box strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-block;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

.btn-full {
    width: 100%;
}

#start-btn,
#calculate-btn {
    display: block;
    margin: 0 auto;
    min-width: 280px;
}

.btn-calculate {
    position: sticky;
    bottom: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    z-index: 10;
}

.btn-calculate.hidden {
    display: none;
}

/* ========================================
   PROGRESS BAR
   ======================================== */
.progress-container {
    position: sticky;
    top: 0;
    background: white;
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-xl);
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

#progress-label {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.progress-bar-bg {
    width: 100%;
    height: 8px;
    background: var(--color-bg-section);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
    border-radius: 999px;
    width: 0%;
    transition: width var(--transition-slow);
}

.score-display {
    text-align: center;
    font-size: var(--font-size-large);
    font-weight: 700;
    color: var(--color-primary);
}

/* ========================================
   QUESTIONS
   ======================================== */
.questions-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.question {
    background: var(--color-bg-section);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.question:hover {
    background: var(--color-bg-hover);
}

.question.answered {
    border-color: var(--color-primary);
    background: rgba(37, 99, 235, 0.05);
}

.question-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.question-number {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-base);
}

.question-content {
    flex: 1;
}

.question-content strong {
    display: block;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.question-content p {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ========================================
   CUSTOM CHECKBOX
   ======================================== */
.checkbox-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
    padding: var(--spacing-sm);
    margin: 0 calc(-1 * var(--spacing-sm));
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

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

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: relative;
    height: 28px;
    width: 28px;
    background-color: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.checkbox-container:hover .checkmark {
    border-color: var(--color-primary);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 9px;
    top: 5px;
    width: 6px;
    height: 11px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-label {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-primary);
}

/* ========================================
   RESULTS SECTION
   ======================================== */
.results-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.score-reveal {
    margin-top: var(--spacing-xl);
}

.score-label {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.score-number {
    font-size: clamp(48px, 10vw, 72px);
    font-weight: 700;
    line-height: 1;
    color: var(--color-primary);
}

.score-total {
    font-size: clamp(24px, 5vw, 36px);
    color: var(--color-text-light);
}

/* ========================================
   RESULT CARDS
   ======================================== */
.result-card {
    background: var(--color-bg-section);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-2xl);
    border-left: 6px solid var(--color-primary);
}

.result-card.success {
    border-left-color: var(--color-success);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(16, 185, 129, 0.02) 100%);
}

.result-card.warning {
    border-left-color: var(--color-warning);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, rgba(245, 158, 11, 0.02) 100%);
}

.result-card.critical {
    border-left-color: var(--color-critical);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.05) 0%, rgba(239, 68, 68, 0.02) 100%);
}

#result-title {
    margin-bottom: var(--spacing-md);
}

.result-description {
    font-size: var(--font-size-large);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

#result-content {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

#result-content p {
    margin-bottom: var(--spacing-md);
}

#result-content strong {
    color: var(--color-text-primary);
}

/* ========================================
   EMAIL CAPTURE FORM
   ======================================== */
.email-capture {
    background: white;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.email-capture h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

#cta-subtext {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.email-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 500px;
    margin: 0 auto var(--spacing-md);
}

#email-input {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast);
}

#email-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

#email-input::placeholder {
    color: var(--color-text-light);
}

/* ========================================
   SOCIAL SHARE
   ======================================== */
.social-share {
    text-align: center;
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-xl);
}

.share-label {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn-share {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: var(--font-size-small);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-linkedin {
    color: #0077b5;
    border-color: #0077b5;
}

.btn-linkedin:hover {
    background: #0077b5;
    color: white;
}

.btn-twitter {
    color: #1da1f2;
    border-color: #1da1f2;
}

.btn-twitter:hover {
    background: #1da1f2;
    color: white;
}

.btn-email {
    color: var(--color-text-secondary);
}

.btn-email:hover {
    background: var(--color-text-secondary);
    color: white;
    border-color: var(--color-text-secondary);
}

/* ========================================
   UTILITIES
   ======================================== */
.privacy-note {
    font-size: var(--font-size-small);
    color: var(--color-text-light);
    text-align: center;
    margin-top: var(--spacing-md);
}

.hidden {
    display: none !important;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 640px) {
    :root {
        --font-size-base: 15px;
    }
    
    .container {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .intro-box {
        padding: var(--spacing-md);
    }
    
    .question {
        padding: var(--spacing-md);
    }
    
    .question-header {
        gap: var(--spacing-sm);
    }
    
    .question-number {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .result-card {
        padding: var(--spacing-lg);
    }
    
    .email-capture {
        padding: var(--spacing-lg);
    }
    
    .share-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn-share {
        justify-content: center;
    }
    
    #start-btn,
    #calculate-btn {
        min-width: auto;
        width: 100%;
    }
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes countUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.score-number {
    animation: countUp 0.5s ease-out;
}

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

.result-card {
    animation: slideUp 0.4s ease-out;
}

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

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}