/* ============================================
   CiteSense Marketing Site - Production Styles
   Mobile-first (375px+), responsive, accessible
   ============================================ */

/* ============================================
   CSS RESET & BASE
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Colors - WCAG AA compliant */
    --color-primary: #0F52BA;
    --color-primary-dark: #0A3C8A;
    --color-primary-light: #E8F0FF;
    --color-secondary: #FF6B35;
    --color-secondary-dark: #E55A2B;
    --color-text: #1A1A1A;
    --color-text-light: #4A4A4A;
    --color-text-muted: #6B7280;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F9FAFB;
    --color-bg-light: #F3F4F6;
    --color-border: #E5E7EB;
    --color-success: #059669;
    --color-warning: #D97706;
    --color-error: #DC2626;
    
    /* Typography */
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    
    /* Spacing scale (8px base) */
    --space-xs: 0.25rem;    /* 4px */
    --space-sm: 0.5rem;     /* 8px */
    --space-md: 1rem;       /* 16px */
    --space-lg: 1.5rem;     /* 24px */
    --space-xl: 2rem;       /* 32px */
    --space-2xl: 3rem;      /* 48px */
    --space-3xl: 4rem;      /* 64px */
    --space-4xl: 6rem;      /* 96px */
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* 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), 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);
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1rem;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

h1 {
    font-size: 2rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.75rem;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.25rem;
}

h4 {
    font-size: 1.125rem;
}

p {
    margin-bottom: var(--space-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-dark);
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

strong {
    font-weight: 600;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    width: 100%;
}

.section {
    padding: var(--space-3xl) 0;
}

.hidden {
    display: none !important;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.site-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--space-md) 0;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--color-primary);
    font-weight: 800;
}

.site-header nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-md);
    align-items: center;
    flex-wrap: wrap;
}

.site-header nav ul li {
    margin: 0;
}

.site-header nav ul li a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
    transition: color 0.2s ease;
}

.site-header nav ul li a:hover {
    color: var(--color-primary);
}

.cta-button-small {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-primary);
    color: white !important;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.cta-button-small:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Mobile navigation - simplified */
@media (max-width: 768px) {
    .site-header nav ul {
        gap: var(--space-sm);
        font-size: 0.875rem;
    }
    
    .site-header nav ul li a:not(.cta-button-small) {
        display: none;
    }
}

/* ============================================
   BUTTONS & CTA
   ============================================ */
.cta-button {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--radius-md);
    transition: all 0.2s ease;
    border: 2px solid transparent;
    cursor: pointer;
    line-height: 1.2;
}

.cta-button.primary {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

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

.cta-button.secondary {
    background: white;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.cta-button.secondary:hover {
    background: var(--color-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cta-button.large {
    padding: var(--space-lg) var(--space-2xl);
    font-size: 1.125rem;
}

.cta-button:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    background: linear-gradient(135deg, #F0F7FF 0%, #E8F0FF 100%);
    padding: var(--space-3xl) 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

.hero-subtitle {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

.hero-disclaimer {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ============================================
   STATS GRID
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin: var(--space-2xl) 0;
}

.stat-card {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: var(--space-md);
}

.stat-card p {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.stat-source {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    display: inline-block;
    margin-top: var(--space-sm);
    text-decoration: underline;
}

/* ============================================
   SECTION STYLES
   ============================================ */
.section h2 {
    text-align: center;
    font-size: 1.875rem;
    margin-bottom: var(--space-xl);
}

.section-note {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    max-width: 700px;
    margin: var(--space-xl) auto 0;
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto var(--space-2xl);
}

.highlight-text {
    background: var(--color-primary-light);
    padding: var(--space-lg);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: 1.0625rem;
    line-height: 1.7;
    margin: var(--space-xl) 0;
}

/* Alternating backgrounds */
.section:nth-child(even) {
    background: var(--color-bg-alt);
}

/* ============================================
   CARDS & GRIDS
   ============================================ */
.recognition-grid,
.deliverables-grid,
.measurement-list,
.trust-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.recognition-card,
.deliverable-card,
.measurement-item,
.trust-card {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.recognition-card h3,
.deliverable-card h3,
.measurement-item h3,
.trust-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.deliverable-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
    display: block;
}

.measurement-item p,
.deliverable-card p,
.recognition-card p,
.trust-card p {
    color: var(--color-text-light);
    margin: 0;
    line-height: 1.6;
}

/* ============================================
   COMPARISON TABLE
   ============================================ */
.comparison-table {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin: var(--space-2xl) 0;
}

.comparison-column {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
}

.comparison-column.highlight {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.comparison-column h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
    text-align: center;
}

.comparison-column ul {
    list-style: none;
    padding: 0;
}

.comparison-column ul li {
    padding: var(--space-sm) 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: var(--space-lg);
}

.comparison-column ul li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

/* ============================================
   SCOPE BOXES
   ============================================ */
.scope-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.scope-box {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
}

.scope-box.included {
    border-color: var(--color-success);
    background: #F0FDF4;
}

.scope-box.excluded {
    border-color: var(--color-text-muted);
    background: var(--color-bg-light);
}

.scope-box h3 {
    margin-bottom: var(--space-lg);
    font-size: 1.25rem;
}

.scope-box ul {
    list-style: none;
    padding: 0;
}

.scope-box ul li {
    padding: var(--space-sm) 0;
    color: var(--color-text-light);
}

/* ============================================
   PRICING
   ============================================ */
.pricing-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin: var(--space-2xl) 0;
}

.pricing-card {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.pricing-card.featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1);
    background: var(--color-primary-light);
}

.pricing-badge {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--space-lg);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pricing-badge.founding {
    background: var(--color-secondary);
}

.pricing-amount {
    margin-bottom: var(--space-xl);
}

.price-range {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text);
    line-height: 1;
    margin-bottom: var(--space-sm);
}

.price-note {
    display: block;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.pricing-includes {
    text-align: left;
    margin-bottom: var(--space-xl);
}

.pricing-includes h4 {
    font-size: 1rem;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.pricing-includes ul {
    list-style: none;
    padding: 0;
}

.pricing-includes ul li {
    padding: var(--space-sm) 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: var(--space-lg);
}

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

.pricing-notes {
    margin-top: var(--space-2xl);
    padding: var(--space-xl);
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    color: var(--color-text-light);
}

.pricing-notes p {
    margin-bottom: var(--space-md);
}

.pricing-notes p:last-child {
    margin-bottom: 0;
}

/* ============================================
   METHODOLOGY
   ============================================ */
.methodology-content {
    max-width: 900px;
    margin: 0 auto;
}

.methodology-steps {
    margin: var(--space-2xl) 0;
}

.method-step {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.step-content h4 {
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
}

.step-content p {
    color: var(--color-text-light);
    margin: 0;
}

.methodology-principles {
    background: var(--color-primary-light);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin: var(--space-2xl) 0;
}

.methodology-principles h3 {
    margin-bottom: var(--space-lg);
}

.methodology-principles ul {
    list-style: none;
    padding: 0;
}

.methodology-principles ul li {
    padding: var(--space-sm) 0;
    color: var(--color-text-light);
    position: relative;
    padding-left: var(--space-lg);
}

.methodology-principles ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

.methodology-sample {
    margin: var(--space-2xl) 0;
}

.evidence-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-xl) 0;
    font-size: 0.875rem;
    overflow-x: auto;
    display: block;
}

.evidence-table thead {
    background: var(--color-primary);
    color: white;
}

.evidence-table th,
.evidence-table td {
    padding: var(--space-md);
    text-align: left;
    border: 1px solid var(--color-border);
}

.evidence-table th {
    font-weight: 600;
    white-space: nowrap;
}

.evidence-table tbody tr:nth-child(even) {
    background: var(--color-bg-alt);
}

.table-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-style: italic;
    text-align: center;
    margin-top: var(--space-md);
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    border: 1px solid var(--color-border);
}

.faq-item h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-md);
    font-size: 1.125rem;
}

.faq-item p {
    color: var(--color-text-light);
    margin: 0;
}

/* ============================================
   FORMS
   ============================================ */
.audit-form {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.form-section {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--color-border);
}

.form-section:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.form-section h3 {
    color: var(--color-primary);
    margin-bottom: var(--space-lg);
    font-size: 1.25rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

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

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-base);
    font-size: 1rem;
    color: var(--color-text);
    background: white;
    transition: border-color 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

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

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

.form-option {
    margin-top: var(--space-md);
}

.form-option input[type="checkbox"] {
    margin-right: var(--space-sm);
}

.form-option label {
    font-weight: 400;
    display: inline;
}

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

.radio-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.radio-label:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.radio-label input[type="radio"] {
    margin: 0;
}

.radio-label span {
    font-weight: 500;
}

.invoice-details {
    margin-top: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
}

.form-actions {
    margin-top: var(--space-2xl);
    text-align: center;
}

.form-note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-top: var(--space-lg);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
    background: var(--color-text);
    color: white;
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

.footer-section p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-sm);
    line-height: 1.6;
}

.footer-location {
    font-size: 0.875rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: underline;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--space-sm);
}

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

/* ============================================
   RESPONSIVE - TABLET (768px+)
   ============================================ */
@media (min-width: 768px) {
    :root {
        --container-padding: 2rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .section h2 {
        font-size: 2.25rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .recognition-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .deliverables-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .comparison-table {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .scope-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .site-header nav ul li a:not(.cta-button-small) {
        display: inline;
    }
}

/* ============================================
   RESPONSIVE - DESKTOP (1024px+)
   ============================================ */
@media (min-width: 1024px) {
    .hero h1 {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.375rem;
    }
    
    .section {
        padding: var(--space-4xl) 0;
    }
    
    .deliverables-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .measurement-list {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .trust-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(4, 1fr);
    }
}

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

@media print {
    .site-header,
    .hero-cta,
    .book-audit,
    .site-footer {
        display: none;
    }
}

/* Focus visible polyfill for keyboard navigation */
:focus:not(:focus-visible) {
    outline: none;
}

/* Skip to content for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--space-sm) var(--space-md);
    z-index: 9999;
}

.skip-link:focus {
    top: 0;
}