/* ========================================
   Decision Intelligence Design System
   Adaptive AI for Retention Decision Intelligence
   ======================================== */

/* ========== Enhanced CSS Variables ========== */
:root {
    /* New Brand Colors */
    --di-primary: #0052FF;          /* Bold Primary Blue */
    --di-primary-hover: #0042CC;
    --di-primary-light: #336BFF;
    --di-secondary: #00D4AA;        /* Teal/Success Green */
    --di-accent: #FF6B35;           /* Urgent Action Orange */
    --di-dark: #0A1628;             /* Deep Navy Background */
    --di-dark-alt: #172438;
    --di-light: #F8FAFC;            /* Near White */
    --di-gray: #64748B;             /* Mid-tone Gray */
    --di-gray-light: #E2E8F0;
    --di-white: #FFFFFF;
    
    /* Semantic Colors */
    --di-success: #00D4AA;
    --di-warning: #FFB020;
    --di-danger: #FF6B35;
    --di-info: #0052FF;
    
    /* Typography Scale */
    --di-font-heading: 'Space Grotesk', 'Inter', -apple-system, sans-serif;
    --di-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --di-font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
    
    /* Spacing System (8px base) */
    --di-space-1: 0.5rem;   /* 8px */
    --di-space-2: 1rem;     /* 16px */
    --di-space-3: 1.5rem;   /* 24px */
    --di-space-4: 2rem;     /* 32px */
    --di-space-5: 3rem;     /* 48px */
    --di-space-6: 4rem;     /* 64px */
    --di-space-8: 6rem;     /* 96px */
    --di-space-10: 8rem;    /* 128px */
    
    /* Shadows */
    --di-shadow-sm: 0 1px 2px rgba(10, 22, 40, 0.06);
    --di-shadow-md: 0 4px 12px rgba(10, 22, 40, 0.1);
    --di-shadow-lg: 0 8px 24px rgba(10, 22, 40, 0.12);
    --di-shadow-xl: 0 16px 48px rgba(10, 22, 40, 0.15);
    --di-shadow-glow: 0 0 24px rgba(0, 82, 255, 0.3);
    
    /* Border Radius */
    --di-radius-sm: 6px;
    --di-radius-md: 12px;
    --di-radius-lg: 16px;
    --di-radius-xl: 24px;
    --di-radius-full: 9999px;
    
    /* Transitions */
    --di-transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --di-transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Hero Section - Decision Intelligence ========== */
.di-hero {
    background: linear-gradient(135deg, var(--di-dark) 0%, var(--di-dark-alt) 100%);
    padding: var(--di-space-10) 0 var(--di-space-8);
    position: relative;
    overflow: hidden;
}

.di-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(0, 82, 255, 0.15), transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(0, 212, 170, 0.1), transparent 50%);
    pointer-events: none;
}

.di-hero .container {
    position: relative;
    z-index: 1;
}

.di-hero-badge {
    display: inline-block;
    background: rgba(0, 82, 255, 0.15);
    border: 1px solid rgba(0, 82, 255, 0.3);
    color: var(--di-secondary);
    padding: var(--di-space-1) var(--di-space-2);
    border-radius: var(--di-radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    margin-bottom: var(--di-space-3);
    text-transform: uppercase;
}

.di-hero h1 {
    font-family: var(--di-font-heading);
    font-size: clamp(2.6rem, 5.2vw, 4.4rem);
    font-weight: 700;
    line-height: 1.15;
    color: var(--di-white);
    margin-bottom: var(--di-space-3);
    letter-spacing: -0.02em;
}

.di-hero h1 span.highlight {
    background: linear-gradient(135deg, var(--di-primary) 0%, var(--di-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.di-hero-subheadline {
    font-size: 1.35rem;
    line-height: 1.6;
    color: var(--di-gray-light);
    margin-bottom: var(--di-space-5);
    max-width: 720px;
}

.di-hero-cta {
    display: flex;
    gap: var(--di-space-2);
    margin-bottom: var(--di-space-6);
    flex-wrap: wrap;
}

.di-hero-meta {
    display: flex;
    gap: var(--di-space-4);
    flex-wrap: wrap;
    padding-top: var(--di-space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.di-hero-meta-item {
    display: flex;
    flex-direction: column;
    gap: var(--di-space-1);
}

.di-hero-meta-label {
    font-size: 0.875rem;
    color: var(--di-gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.di-hero-meta-value {
    font-size: 1rem;
    color: var(--di-white);
    font-weight: 500;
}

/* ========== Buttons - Enhanced ========== */
.btn-di-primary {
    display: inline-flex;
    align-items: center;
    gap: var(--di-space-1);
    background: var(--di-primary);
    color: var(--di-white);
    padding: 1rem 2rem;
    border-radius: var(--di-radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--di-transition);
    box-shadow: var(--di-shadow-md);
    text-decoration: none;
}

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

.btn-di-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--di-space-1);
    background: transparent;
    color: var(--di-white);
    padding: 1rem 2rem;
    border-radius: var(--di-radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--di-transition);
    text-decoration: none;
}

.btn-di-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* ========== Problem Statement Section ========== */
.di-problem {
    padding: var(--di-space-8) 0;
    background: var(--di-white);
}

.di-problem-headline {
    text-align: center;
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--di-dark);
    margin-bottom: var(--di-space-2);
    letter-spacing: -0.02em;
}

.di-problem-subheadline {
    text-align: center;
    font-size: 1.5rem;
    color: var(--di-gray);
    margin-bottom: var(--di-space-6);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.di-problem-statement {
    background: var(--di-light);
    border-left: 4px solid var(--di-accent);
    padding: var(--di-space-4);
    border-radius: var(--di-radius-md);
    margin-bottom: var(--di-space-5);
}

.di-problem-statement p {
    font-size: 1.25rem;
    line-height: 1.7;
    color: var(--di-dark);
    margin: 0;
}

/* ========== Decision Intelligence Section ========== */
.di-explanation {
    padding: var(--di-space-8) 0;
    background: linear-gradient(180deg, var(--di-white) 0%, var(--di-light) 100%);
}

.di-section-header {
    text-align: center;
    margin-bottom: var(--di-space-6);
}

.di-section-eyebrow {
    color: var(--di-primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-size: 0.875rem;
    margin-bottom: var(--di-space-2);
}

.di-section-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--di-dark);
    margin-bottom: var(--di-space-2);
    line-height: 1.2;
}

.di-section-description {
    font-size: 1.25rem;
    color: var(--di-gray);
    max-width: 720px;
    margin: 0 auto;
}

.di-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--di-space-4);
    margin-top: var(--di-space-6);
}

.di-feature-card {
    background: var(--di-white);
    border: 1px solid var(--di-gray-light);
    border-radius: var(--di-radius-lg);
    padding: var(--di-space-4);
    transition: var(--di-transition);
}

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

.di-feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--di-primary), var(--di-secondary));
    border-radius: var(--di-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--di-space-3);
}

.di-feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--di-dark);
    margin-bottom: var(--di-space-2);
}

.di-feature-description {
    color: var(--di-gray);
    line-height: 1.7;
}

/* ========== Retention Inbox Section ========== */
.di-inbox {
    padding: var(--di-space-8) 0;
    background: var(--di-dark);
    color: var(--di-white);
}

.di-inbox-header {
    text-align: center;
    margin-bottom: var(--di-space-6);
}

.di-inbox-title {
    font-size: clamp(2.5rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--di-white);
    margin-bottom: var(--di-space-2);
}

.di-inbox-description {
    font-size: 1.25rem;
    color: var(--di-gray-light);
    max-width: 720px;
    margin: 0 auto;
}

.di-inbox-ui {
    background: var(--di-dark-alt);
    border-radius: var(--di-radius-xl);
    padding: var(--di-space-5);
    box-shadow: var(--di-shadow-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.di-inbox-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--di-space-3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--di-space-4);
}

.di-inbox-header-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--di-white);
}

.di-inbox-stats {
    display: flex;
    gap: var(--di-space-3);
}

.di-inbox-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.di-inbox-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--di-secondary);
}

.di-inbox-stat-label {
    font-size: 0.875rem;
    color: var(--di-gray);
}

.di-inbox-action {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--di-radius-md);
    padding: var(--di-space-3);
    margin-bottom: var(--di-space-2);
    transition: var(--di-transition);
}

.di-inbox-action:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--di-primary);
}

.di-inbox-action-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--di-space-2);
}

.di-inbox-action-priority {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--di-radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.di-inbox-action-priority.high {
    background: rgba(255, 107, 53, 0.2);
    color: var(--di-accent);
}

.di-inbox-action-priority.medium {
    background: rgba(255, 176, 32, 0.2);
    color: var(--di-warning);
}

.di-inbox-action-revenue {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--di-secondary);
}

.di-inbox-action-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--di-white);
    margin-bottom: var(--di-space-1);
}

.di-inbox-action-why {
    font-size: 0.875rem;
    color: var(--di-gray-light);
    margin-bottom: var(--di-space-2);
}

.di-inbox-action-details {
    display: flex;
    gap: var(--di-space-3);
    font-size: 0.875rem;
}

.di-inbox-action-detail {
    color: var(--di-gray);
}

.di-inbox-action-detail strong {
    color: var(--di-white);
    font-weight: 600;
}

/* ========== Modules Section - Reframed ========== */
.di-modules {
    padding: var(--di-space-8) 0;
    background: var(--di-white);
}

.di-modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--di-space-4);
    margin-top: var(--di-space-6);
}

.di-module-card {
    background: var(--di-light);
    border: 2px solid var(--di-gray-light);
    border-radius: var(--di-radius-lg);
    padding: var(--di-space-5);
    transition: var(--di-transition);
    position: relative;
    overflow: hidden;
}

.di-module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--di-primary), var(--di-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--di-transition);
}

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

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

.di-module-icon {
    font-size: 2rem;
    margin-bottom: var(--di-space-2);
}

.di-module-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--di-dark);
    margin-bottom: var(--di-space-2);
}

.di-module-decision {
    font-size: 1rem;
    color: var(--di-primary);
    font-weight: 600;
    margin-bottom: var(--di-space-2);
}

.di-module-why {
    font-size: 0.95rem;
    color: var(--di-gray);
    margin-bottom: var(--di-space-3);
    line-height: 1.6;
}

.di-module-action {
    font-size: 0.875rem;
    color: var(--di-dark);
    background: rgba(0, 82, 255, 0.1);
    padding: var(--di-space-2);
    border-radius: var(--di-radius-sm);
    border-left: 3px solid var(--di-primary);
}

/* ========== Proof Section ========== */
.di-proof {
    padding: var(--di-space-8) 0;
    background: var(--di-light);
}

.di-proof-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--di-space-4);
    margin-top: var(--di-space-6);
}

.di-proof-card {
    background: var(--di-white);
    border-radius: var(--di-radius-lg);
    padding: var(--di-space-4);
    box-shadow: var(--di-shadow-md);
}

.di-proof-metric {
    font-size: 3rem;
    font-weight: 700;
    color: var(--di-primary);
    margin-bottom: var(--di-space-1);
}

.di-proof-label {
    font-size: 1rem;
    color: var(--di-gray);
    margin-bottom: var(--di-space-3);
}

.di-proof-example {
    font-size: 0.875rem;
    color: var(--di-dark);
    line-height: 1.6;
    padding-top: var(--di-space-2);
    border-top: 1px solid var(--di-gray-light);
}

/* ========== Trust Section ========== */
.di-trust {
    padding: var(--di-space-8) 0;
    background: var(--di-white);
}

.di-trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--di-space-4);
    margin-top: var(--di-space-6);
}

.di-trust-item {
    text-align: center;
    padding: var(--di-space-4);
}

.di-trust-icon {
    font-size: 2.5rem;
    margin-bottom: var(--di-space-2);
}

.di-trust-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--di-dark);
    margin-bottom: var(--di-space-1);
}

.di-trust-description {
    font-size: 0.95rem;
    color: var(--di-gray);
    line-height: 1.6;
}

.di-trust-badge {
    display: inline-block;
    background: rgba(0, 212, 170, 0.1);
    color: var(--di-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--di-radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: var(--di-space-2);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .di-hero {
        padding: var(--di-space-6) 0 var(--di-space-5);
    }
    
    .di-hero h1 {
        font-size: 2.5rem;
    }
    
    .di-hero-subheadline {
        font-size: 1.125rem;
    }
    
    .di-hero-cta {
        flex-direction: column;
    }
    
    .di-hero-cta .btn-di-primary,
    .di-hero-cta .btn-di-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .di-modules-grid,
    .di-features-grid,
    .di-proof-grid,
    .di-trust-grid {
        grid-template-columns: 1fr;
    }
    
    .di-inbox-ui {
        padding: var(--di-space-3);
    }
    
    .di-inbox-action-header {
        flex-direction: column;
        gap: var(--di-space-2);
    }
    
    .di-inbox-stats {
        flex-direction: column;
        gap: var(--di-space-2);
    }
}

/* ========== Utility Classes ========== */
.di-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--di-space-3);
}

.di-text-center {
    text-align: center;
}

.di-text-gradient {
    background: linear-gradient(135deg, var(--di-primary) 0%, var(--di-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.di-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--di-radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.di-badge-success {
    background: rgba(0, 212, 170, 0.15);
    color: var(--di-secondary);
}

.di-badge-warning {
    background: rgba(255, 176, 32, 0.15);
    color: var(--di-warning);
}

.di-badge-danger {
    background: rgba(255, 107, 53, 0.15);
    color: var(--di-accent);
}