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

:root {
    /* Colors - Professional Black & White Theme */
    --color-primary: #000000;
    --color-secondary: #1a1a1a;
    --color-accent: #333333;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-background: #ffffff;
    --color-background-alt: #f8f9fa;
    --color-border: #e5e7eb;
    --color-success: #10b981;
    --color-highlight: #f3f4f6;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* 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: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background: var(--color-background);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   HEADER
   =================================== */
.header {
    background: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

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

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

.header-badge {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.5px;
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
    text-align: center;
    background: linear-gradient(180deg, var(--color-background) 0%, var(--color-background-alt) 100%);
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--color-highlight);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 12px;
    font-weight: var(--font-weight-semibold);
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.section-label i {
    width: 16px;
    height: 16px;
}

.hero-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    color: var(--color-text-light);
    font-weight: var(--font-weight-light);
    margin-bottom: var(--spacing-xl);
}

.recipient-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.recipient-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.recipient-card i {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.recipient-card .label {
    font-size: 12px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: var(--font-weight-medium);
}

.recipient-card .value {
    font-size: 18px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-top: 4px;
}

.recipient-card .company {
    font-size: 14px;
    color: var(--color-text-light);
    margin-top: 2px;
}

/* ===================================
   SECTIONS
   =================================== */
.section {
    padding: var(--spacing-2xl) 0;
}

.section-alt {
    background: var(--color-background-alt);
}

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

.section-number {
    font-size: 48px;
    font-weight: var(--font-weight-bold);
    color: var(--color-border);
    line-height: 1;
    min-width: 80px;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-top: var(--spacing-xs);
    letter-spacing: -0.01em;
}

/* ===================================
   CONTENT CARDS
   =================================== */
.content-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.intro-text {
    font-size: 18px;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
}

.highlight-box {
    background: var(--color-highlight);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.highlight-box i {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 4px;
}

.highlight-box h3 {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.highlight-box p {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* ===================================
   PRICING CARDS
   =================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.pricing-card {
    background: white;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

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

.pricing-card:hover::before {
    transform: scaleX(1);
}

.pricing-card.featured {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, #fafafa 0%, #ffffff 100%);
}

.pricing-card.featured::before {
    transform: scaleX(1);
}

.commission-card {
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    color: white;
    border-color: var(--color-primary);
}

.commission-card .pricing-title,
.commission-card .pricing-description,
.commission-card .pricing-features li {
    color: white;
}

.commission-card .pricing-icon {
    background: rgba(255, 255, 255, 0.1);
}

.commission-card .pricing-icon i {
    color: white;
}

.pricing-icon {
    width: 64px;
    height: 64px;
    background: var(--color-highlight);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.pricing-icon i {
    width: 32px;
    height: 32px;
    color: var(--color-primary);
}

.pricing-title {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.pricing-amount {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin: var(--spacing-md) 0;
}

.pricing-amount .currency {
    font-size: 24px;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
}

.pricing-amount .amount {
    font-size: 48px;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    line-height: 1;
}

.commission-amount .amount {
    color: white;
}

.pricing-amount .per {
    font-size: 16px;
    color: var(--color-text-light);
    font-weight: var(--font-weight-normal);
}

.pricing-description {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.pricing-features {
    list-style: none;
    margin-top: var(--spacing-md);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    font-size: 15px;
    color: var(--color-text);
}

.pricing-features i {
    width: 20px;
    height: 20px;
    color: var(--color-success);
    flex-shrink: 0;
}

.pricing-note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-highlight);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 13px;
    color: var(--color-text-light);
}

.pricing-note i {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.tax-notice {
    background: var(--color-highlight);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 14px;
    color: var(--color-text-light);
    margin-top: var(--spacing-lg);
}

.tax-notice i {
    width: 20px;
    height: 20px;
}

/* ===================================
   VALUE PROPOSITION
   =================================== */
.value-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.value-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-base);
}

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

.value-icon {
    width: 56px;
    height: 56px;
    background: var(--color-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.value-icon i {
    width: 28px;
    height: 28px;
    color: white;
}

.value-card h3 {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.value-card p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.7;
}

/* ===================================
   TIMELINE
   =================================== */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-lg);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: 18px;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 4px white, 0 0 0 6px var(--color-border);
}

.timeline-content {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    flex: 1;
    transition: all var(--transition-base);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.timeline-content h3 {
    font-size: 20px;
    font-weight: var(--font-weight-semibold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.timeline-content p {
    font-size: 15px;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.timeline-duration {
    display: inline-block;
    background: var(--color-highlight);
    padding: 4px var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--color-text-light);
    font-weight: var(--font-weight-medium);
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-xl);
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.contact-content h3 {
    font-size: 28px;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.contact-content p {
    font-size: 16px;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.contact-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn i {
    width: 20px;
    height: 20px;
}

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

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

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.stat-box {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    min-width: 180px;
}

.stat-value {
    font-size: 48px;
    font-weight: var(--font-weight-bold);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 14px;
    opacity: 0.9;
    font-weight: var(--font-weight-medium);
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    height: 36px;
    width: auto;
    filter: invert(1) brightness(1.3) contrast(1.2);
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    font-size: 14px;
    opacity: 0.7;
}

.footer-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: var(--spacing-sm);
}

.footer-info i {
    width: 18px;
    height: 18px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    opacity: 0.6;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.footer-note {
    font-style: italic;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 768px) {
    .section-number {
        font-size: 32px;
        min-width: 60px;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-card {
        grid-template-columns: 1fr;
    }
    
    .contact-visual {
        flex-direction: row;
    }
    
    .stat-box {
        flex: 1;
        min-width: 0;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .timeline {
        padding-left: var(--spacing-lg);
    }
    
    .timeline::before {
        left: 14px;
    }
    
    .timeline-marker {
        width: 32px;
        height: 32px;
        font-size: 16px;
    }
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
    @page {
        margin: 0.5in;
        @top-center {
            content: "Partnership Proposal - Neural Arc Inc × GTT Data";
        }
        @bottom-center {
            content: "Created by Helium AI";
        }
    }
    
    body {
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }
    
    .header {
        position: static;
        border-bottom: 2px solid var(--color-border);
    }
    
    .section {
        page-break-inside: avoid;
    }
    
    .pricing-card,
    .value-card,
    .timeline-item {
        page-break-inside: avoid;
    }
}