/* Visual Separation - Clean Minimalist Design */
/* Black, White, and Subtle Grays Only */

:root {
    --section-bg-white: #ffffff;
    --section-bg-light: #fafafa;
    --section-bg-gray: #f7f7f7;
    --border-light: rgba(0, 0, 0, 0.06);
    --border-medium: rgba(0, 0, 0, 0.1);
    --shadow-subtle: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Section Background Alternation */
section {
    position: relative;
    border-bottom: 1px solid var(--border-light);
}

/* Hero stays white */
#hero-section {
    background: var(--section-bg-white);
    border-bottom: 1px solid var(--border-medium);
}

/* Core Values - Light Gray */
#core-values {
    background: var(--section-bg-light);
    padding: 100px 0;
}

/* Experience - White with strong separation */
#experience {
    background: var(--section-bg-white);
    padding: 100px 0;
    border-top: 2px solid var(--border-medium);
}

/* Services - White */
#services {
    background: var(--section-bg-white);
    padding: 100px 0;
}

/* Advisory Board - Light Gray with stronger separation */
#team {
    background: var(--section-bg-light);
    padding: 100px 0;
    border-top: 2px solid var(--border-medium);
    margin-top: 80px;
}

/* Card Elevation System */
.value-card,
.method-card,
.experience-item,
.service-card {
    background: var(--section-bg-white);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-subtle);
    transition: all 0.3s ease;
}

.value-card:hover,
.method-card:hover,
.experience-item:hover,
.service-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
    border-color: var(--border-medium);
}

/* Team Member Cards - Stronger Elevation */
.team-member {
    background: var(--section-bg-white);
    border: 1px solid var(--border-medium);
    box-shadow: var(--shadow-card);
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.team-member:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px);
}

/* Section Headers - Visual Anchors */
.section-header {
    position: relative;
    padding-bottom: 30px;
    margin-bottom: 60px;
}

.section-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: #000;
}

/* Chat Interface Separation */
.chat-interface {
    background: var(--section-bg-white);
    border: 2px solid var(--border-medium);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    border-radius: 12px;
    overflow: hidden;
}

.chat-header {
    background: #000;
    color: white;
    padding: 20px;
    border-bottom: none;
}

.chat-messages {
    background: var(--section-bg-white);
    border-bottom: 1px solid var(--border-light);
}

/* Mobile Specific Improvements */
@media (max-width: 768px) {
    /* Stronger section separation on mobile */
    section {
        padding: 60px 0;
        border-bottom: 2px solid var(--border-medium);
    }
    
    /* Card separation on mobile */
    .value-card,
    .method-card,
    .experience-item,
    .service-card,
    .team-member {
        margin-bottom: 24px;
        border: 1px solid var(--border-medium);
        box-shadow: var(--shadow-card);
        background: var(--section-bg-white);
    }
    
    /* Alternating backgrounds more pronounced */
    #core-values {
        background: var(--section-bg-gray);
        padding: 60px 20px;
    }
    
    #experience {
        background: var(--section-bg-white);
        padding: 60px 20px;
        border-top: 2px solid var(--border-medium);
    }
    
    #team {
        background: var(--section-bg-gray);
        border-top: 3px solid #000;
        margin-top: 40px;
        padding: 60px 20px;
    }
    
    /* Chat interface mobile */
    .chat-interface {
        border-radius: 0;
        border: none;
        border-top: 3px solid #000;
        box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.1);
    }
    
    /* Section headers on mobile */
    .section-header {
        border-bottom: 2px solid var(--border-medium);
        padding-bottom: 20px;
        margin-bottom: 40px;
    }
    
    .section-header::after {
        display: none;
    }
    
    /* Visual breaks between cards */
    .grid > * + * {
        margin-top: 20px;
        padding-top: 20px;
        border-top: 1px solid var(--border-light);
    }
}

/* Typography Improvements for Hierarchy */
h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #000;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #000;
}

p {
    color: #333;
    line-height: 1.6;
}

/* Subtle Section Transitions */
section {
    transition: background-color 0.3s ease;
}

/* Clean Divider Option */
.section-divider {
    height: 1px;
    background: linear-gradient(to right, 
        transparent, 
        var(--border-medium) 20%, 
        var(--border-medium) 80%, 
        transparent);
    margin: 80px 0;
}

/* Button Hierarchy */
.primary-cta {
    background: #000;
    color: white;
    padding: 16px 32px;
    border: 2px solid #000;
    font-weight: 600;
    transition: all 0.3s ease;
}

.primary-cta:hover {
    background: white;
    color: #000;
    box-shadow: var(--shadow-hover);
}

.secondary-cta {
    background: white;
    color: #000;
    padding: 14px 28px;
    border: 1px solid var(--border-medium);
    transition: all 0.3s ease;
}

.secondary-cta:hover {
    border-color: #000;
    box-shadow: var(--shadow-card);
}

/* Clean Container Boundaries */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Visual Breathing Room */
section + section {
    position: relative;
}

section + section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-light);
}

/* Focus on Content Hierarchy */
.content-block {
    background: var(--section-bg-white);
    padding: 40px;
    border-radius: 8px;
    border: 1px solid var(--border-light);
    margin-bottom: 30px;
}

.content-block:hover {
    box-shadow: var(--shadow-card);
}

/* Mobile Content Blocks */
@media (max-width: 768px) {
    .content-block {
        padding: 24px;
        border-radius: 4px;
        border: 1px solid var(--border-medium);
        background: white;
        margin-bottom: 20px;
    }
}