@layer foundation, components, utilities;

@layer foundation {
    :root {
        /* DESIGN TOKENS - BG CORE */
        --bg-black: #111111;
        --bg-blue: #0B3B8C;
        --bg-blue-hover: #082B5C;
        --bg-white: #FFFFFF;
        --bg-border: #E2E8F0;
        --bg-light-grey: #F8FAFC;
        
        /* TEXT TOKENS */
        --bg-text-main: #111111;
        --bg-text-muted: #475569;
        --bg-text-on-dark: rgba(255, 255, 255, 0.85);
        
        /* SPACING TOKENS */
        --bg-space-xs: clamp(0.5rem, 0.4vw + 0.4rem, 0.75rem);
        --bg-space-sm: clamp(0.75rem, 0.6vw + 0.6rem, 1rem);
        --bg-space-md: clamp(1.25rem, 1vw + 1rem, 1.75rem);
        --bg-space-lg: clamp(2rem, 2vw + 1.5rem, 3rem);
        --bg-space-xl: clamp(3.5rem, 4vw + 2.5rem, 5.5rem);
        
        /* TYPOGRAPHY TOKENS */
        --bg-font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        --bg-fs-h1: clamp(2rem, 5vw + 1rem, 2.875rem);
        --bg-fs-h2: clamp(1.75rem, 3vw + 1rem, 2.25rem);
        --bg-fs-h3: clamp(1.25rem, 2vw + 0.75rem, 1.3125rem);
        --bg-fs-body: 1.1875rem;
        --bg-fs-small: 0.875rem;
        --bg-fs-xs: 0.8125rem;
        --bg-fs-tiny: 0.6875rem;
    }
}

@layer components {
    /* 1. LAYOUT PRIMITIVES */
    .bg-container {
        inline-size: 100%;
        max-inline-size: 1140px;
        margin-inline: auto;
        padding-inline: clamp(1.875rem, 4vw, 2.5rem);
    }

    .bg-section, .bg-section-standard {
        padding-block: var(--bg-space-xl);
    }

    .bg-section-tight {
        padding-block: var(--bg-space-lg);
    }

    .bg-section-dark {
        background-color: var(--bg-black);
        color: var(--bg-white);
    }

    .bg-grid {
        display: grid;
        gap: var(--bg-space-md);
    }

    .bg-grid-3, .bg-grid-standard {
        grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    }

    /* ASYMMETRIC GRID PRIMITIVES */
    .bg-grid-2-3 {
        grid-template-columns: 2fr 3fr;
    }

    .bg-grid-3-2 {
        grid-template-columns: 3fr 2fr;
    }

    @media (max-width: 992px) {
        .bg-grid-2-3, .bg-grid-3-2 {
            grid-template-columns: 1fr;
        }
    }

    /* 2. COMPONENT PRIMITIVES */
    .bg-card, .bg-card-standard {
        background-color: var(--bg-white);
        border: 1px solid var(--bg-border);
        border-radius: 6px;
        padding: var(--bg-space-lg);
        display: flex;
        flex-direction: column;
        height: 100%;
        transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    }

    .bg-card:hover {
        border-color: var(--bg-blue);
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.04);
    }

    .bg-card-action {
        margin-top: auto;
        padding-top: var(--bg-space-md);
    }

    .bg-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: 0.9375rem 1.875rem;
        font-size: var(--bg-fs-small);
        font-weight: 700;
        border-radius: 4px;
        cursor: pointer;
        transition: all 0.15s ease;
        border: 1px solid transparent;
    }

    .bg-btn-primary, .bg-cta-primary {
        background-color: var(--bg-blue);
        color: var(--bg-white);
        box-shadow: 0 4px 12px rgba(11, 59, 140, 0.12);
    }

    .bg-btn-primary:hover {
        background-color: var(--bg-blue-hover);
        transform: translateY(-1px);
    }

    .bg-btn-outline {
        background-color: var(--bg-white);
        border-color: var(--bg-border);
        color: var(--bg-black);
    }

    .bg-btn-outline:hover {
        background-color: var(--bg-light-grey);
        border-color: var(--bg-text-muted);
    }

    .bg-btn:focus-visible {
        outline: 2px solid var(--bg-blue);
        outline-offset: 2px;
    }

    /* INSTITUTIONAL CHECKLIST */
    .bg-list-check {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .bg-list-check li {
        position: relative;
        padding-left: 28px;
        margin-bottom: var(--bg-space-sm);
        font-size: var(--bg-fs-body);
        line-height: 1.5;
    }

    .bg-list-check li::before {
        content: "";
        position: absolute;
        left: 0;
        top: 4px;
        width: 18px;
        height: 18px;
        background-color: var(--bg-blue);
        mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
        -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E") no-repeat center;
    }

    .bg-section-dark .bg-list-check li::before {
        background-color: var(--bg-white);
    }

    /* TRUST STRIP PRIMITIVE */
    .bg-trust-strip {
        background-color: var(--bg-light-grey);
        padding-block: var(--bg-space-md);
        border-block: 1px solid var(--bg-border);
    }

    .bg-trust-flex {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: var(--bg-space-md);
    }

    .bg-trust-item {
        font-size: var(--bg-fs-xs);
        font-weight: 700;
        color: var(--bg-black);
        display: flex;
        align-items: center;
        gap: 12px;
        letter-spacing: 0.02em;
    }

    /* 3. ATOMIC PRIMITIVES */
    .bg-heading-hero, .bg-h1-hero {
        font-size: var(--bg-fs-h1);
        font-weight: 800;
        line-height: 1.15;
        letter-spacing: -0.04em;
        color: var(--bg-black);
    }

    .bg-heading-section, .bg-h2-section {
        font-size: var(--bg-fs-h2);
        font-weight: 800;
        letter-spacing: -0.03em;
        color: var(--bg-black);
    }

    .bg-text-body {
        font-size: var(--bg-fs-body);
        color: var(--bg-text-muted);
        line-height: 1.6;
    }

    .bg-text-small {
        font-size: var(--bg-fs-small);
        color: var(--bg-text-muted);
    }

    .bg-label, .bg-label-institutional {
        font-size: var(--bg-fs-tiny);
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.1em;
        color: var(--bg-blue);
    }

    /* DARK SECTION ADAPTATION */
    .bg-section-dark .bg-heading-hero,
    .bg-section-dark .bg-heading-section,
    .bg-section-dark .bg-text-body,
    .bg-section-dark .bg-text-small {
        color: var(--bg-white);
    }

    .bg-section-dark .bg-text-body {
        color: var(--bg-text-on-dark);
    }
}

@layer utilities {
    .bg-stack > * + *, .bg-stack-standard > * + * {
        margin-block-start: var(--bg-space-md);
    }

    .bg-cluster {
        display: flex;
        flex-wrap: wrap;
        gap: var(--bg-space-sm);
        align-items: center;
    }

    .bg-bg-black { background-color: var(--bg-black); }
    .bg-text-white { color: var(--bg-white); }
    .bg-text-center { text-align: center; }
    
    .bg-hide-mobile {
        @media (max-width: 768px) {
            display: none !important;
        }
    }
    
    .bg-show-mobile {
        display: none;
        @media (max-width: 768px) {
            display: flex !important;
        }
    }

    .bg-mobile-nav {
        display: none;
        @media (max-width: 768px) {
            display: flex;
            gap: 18px;
            justify-content: flex-start;
            flex-wrap: wrap;
            padding-top: 15px;
            border-top: 1px solid var(--bg-border);
            margin-top: 15px;
        }
    }

    .bg-mobile-nav-link {
        text-decoration: none;
        color: var(--bg-black);
        font-weight: 600;
        font-size: 13px;
    }
}

@media (max-width: 768px) {
    .bg-section-dark,
    .bg-heading-hero,
    .bg-heading-section,
    .bg-container {
        width: 100%;
        max-width: 100%;
        min-width: 0;
        overflow-x: hidden;
        box-sizing: border-box;
    }

    .bg-heading-hero,
    .bg-hero h1 {
        font-size: clamp(1.8rem, 7vw, 2.4rem) !important;
        line-height: 1.08 !important;
        overflow-wrap: anywhere !important;
        word-break: break-word !important;
        hyphens: auto !important;
        max-width: 100% !important;
    }

    .bg-container {
        padding-inline: 20px !important;
    }
}