:root {
    /* Brand Colors - Architectural Ledger */
    --sol-primary: #004ccd;
    --sol-primary-container: #0f62fe;
    --sol-on-primary: #ffffff;
    
    --sol-secondary: #006e2a;
    --sol-secondary-container: #82f893;
    --sol-on-secondary: #ffffff;
    
    --sol-tertiary-container: #4b67d3;
    
    /* Error */
    --sol-error: #ba1a1a;
    --sol-on-error: #ffffff;

    /* Backgrounds & Surface Hierarchy */
    --sol-bg-body: #fcf9f8; /* surface */
    --sol-surface: #fcf9f8;
    --sol-surface-container-low: #f6f3f2;
    --sol-surface-container: #f0edec;
    --sol-surface-container-high: #eae7e7;
    --sol-surface-container-lowest: #ffffff;
    
    /* Text & Lines */
    --sol-on-surface: #1c1b1b;
    --sol-outline-variant: #c3c6d8;
    
    /* Typography */
    --sol-font-family: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Shapes - The "Hard-Edge" Rule */
    --sol-radius-card: 0px;
    --sol-radius-pill: 0px;
    --sol-radius-base: 0px;
    --sol-radius-input: 0px;
    --sol-radius-button: 0px;
    
    /* Shadows - Ambient & Ghost */
    /* Derived from primary at very low opacity to create an ambient glow/ghost border */
    --sol-shadow-soft: 0 4px 32px rgba(15, 98, 254, 0.06);
    --sol-ghost-border: 1px solid rgba(195, 198, 216, 0.15); /* outline_variant at 15% */
}