/* ==========================================================================
   CSS ARCHITECTURE: Arimo & Persian Green (Modern SF Deployment)
   Engineered for maximum cognitive retention and elegant digital typography.
========================================================================== 
*/

/* API INJECTION: Loading Arimo */
@import url('https://fonts.googleapis.com/css2?family=Arimo:ital,wght@0,400;0,600;1,400;1,600&display=swap');

:root {
    /* Typographic Geometry: Strict standardisation on Arimo */
    --font-main: "Arimo", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --page-width: 800px;
    
    /* Ergonomic Light Mode (Persian Green Aesthetic) */
    --bg-colour: #F4F9F8; 
    --text-colour: #12211F; 
    --accent-colour: #00A497; 
    --border-colour: #C5E3E0;
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Ergonomic Dark Mode */
        --bg-colour: #061211; 
        --text-colour: #D8EAE7; 
        --accent-colour: #00CBAA; 
        --border-colour: #133330;
    }
}

html {
    box-sizing: border-box;
    -webkit-text-size-adjust: 100%;
}
*, *:before, *:after { box-sizing: inherit; }

body {
    font-family: var(--font-main);
    color: var(--text-colour);
    background-color: var(--bg-colour);
    max-width: var(--page-width);
    margin: 0 auto;
    padding: 5rem 2rem; 
    text-align: left;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased; 
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* ==========================================================================
   SPATIAL HIERARCHY & PARAGRAPH GEOMETRY
========================================================================== */

p {
    font-size: 1.15rem; 
    line-height: 2.0; 
    text-indent: 0; 
    margin-top: 0;
    margin-bottom: 2rem; 
}

/* ==========================================================================
   HEADER TYPOGRAPHY (Regular Weight Titles)
========================================================================== */

h1, h2, h3, h4, .title {
    font-family: var(--font-main);
    color: var(--accent-colour);
    line-height: 1.35; 
    margin-top: 0;
}

header {
    margin-bottom: 5rem;
    border-bottom: 1px solid var(--accent-colour);
    padding-bottom: 2.5rem;
}

h1.title {
    font-size: 2.75rem;
    font-weight: 400; 
    letter-spacing: -0.01em; 
    text-align: left;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.25rem;
    font-weight: 400; 
    letter-spacing: -0.01em;
    margin-bottom: 3rem;
}

h2 {
    font-size: 1.75rem;
    font-weight: 600; 
    letter-spacing: 0;
    margin-top: 4.5rem; 
    margin-bottom: 1.75rem;
}

h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    color: var(--text-colour); 
}

h4 {
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase; 
    letter-spacing: 0.05em;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--accent-colour);
}

/* ==========================================================================
   DATA STRUCTURES (Lists, Quotes, References)
========================================================================== */

ul, ol {
    font-size: 1.15rem;
    line-height: 2.0; 
    margin-top: 0;
    margin-bottom: 2rem;
    padding-left: 2.5rem;
}

li { margin-bottom: 0.75rem; }

blockquote {
    margin: 3rem 0;
    padding: 1.5rem 2.5rem;
    border-left: 3px solid var(--accent-colour);
    background-color: rgba(0, 164, 151, 0.04); 
    border-radius: 0 4px 4px 0;
}

blockquote p {
    font-style: italic;
    color: var(--text-colour);
    opacity: 0.9;
}

blockquote p:last-child { margin-bottom: 0; }

.references p, div.csl-entry {
    font-size: 1rem; 
    line-height: 1.8;
    padding-left: 2.5rem;
    text-indent: -2.5rem; 
    margin-bottom: 1.25rem;
}