/* =========================================
   concepts.news - Styles
   Soft Serif Editorial Blog
   ========================================= */

/* --- CSS Custom Properties --- */
:root {
    --paper: #faf7f2;
    --ink: #1a1a1a;
    --rule: #c8c0b4;
    --accent: #8b2c2c;
    --secondary: #2c5f7c;
    --surface: #f0ebe3;
    --muted: #7a7468;
    --highlight: #fff3cd;

    --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
    --font-body: 'Crimson Text', Georgia, serif;
    --font-ui: 'Karla', 'Helvetica Neue', Arial, sans-serif;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 400;
    line-height: 1.8;
    color: var(--ink);
    background-color: var(--paper);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Horizontal Rules --- */
.rule {
    border: none;
    border-top: 1px solid var(--rule);
    margin: 2rem 0;
}

.rule--ornament {
    position: relative;
    border-top: 1px solid var(--rule);
    margin: 2.5rem 0;
    overflow: visible;
}

.rule--ornament::after {
    content: '\2666';
    position: absolute;
    top: -0.6em;
    left: 50%;
    transform: translateX(-50%);
    background: var(--paper);
    padding: 0 0.75rem;
    color: var(--rule);
    font-size: 0.85rem;
    line-height: 1;
}

.rule--light {
    border-top: 1px solid var(--rule);
    margin: 1.5rem 0;
    opacity: 0.5;
}

/* --- Masthead (Hero) --- */
#masthead {
    width: 100%;
    background-color: var(--paper);
    padding: 3rem 0 0;
}

.masthead-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 2rem;
}

.masthead-top {
    text-align: center;
    padding-bottom: 1.5rem;
}

.site-name {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 700;
    color: var(--ink);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.date-line {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--muted);
}

/* --- Featured Concept --- */
.featured-concept {
    text-align: center;
    padding: 2.5rem 0 3rem;
}

.featured-label {
    display: block;
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.featured-word {
    font-family: var(--font-display);
    font-size: clamp(4rem, 10vw, 8rem);
    font-weight: 900;
    color: var(--ink);
    letter-spacing: 0.05em;
    line-height: 1;
    margin-bottom: 1.5rem;
}

.featured-intro {
    font-family: var(--font-body);
    font-size: 1.15rem;
    line-height: 1.9;
    color: var(--ink);
    max-width: 640px;
    margin: 0 auto;
}

/* --- Main Layout --- */
#main-layout {
    display: grid;
    grid-template-columns: 1fr 200px;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 2rem;
    gap: 2.5rem;
}

#content {
    min-width: 0;
}

/* --- Section Headings --- */
.section-heading {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--muted);
    margin-bottom: 1rem;
}

/* --- Editorial Grid --- */
#editorial-grid {
    padding-bottom: 1rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

/* --- Cards --- */
.card {
    padding: 1.5rem 0;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.card:hover {
    opacity: 0.75;
}

.card--feature {
    grid-column: 1 / 3;
    padding: 2rem 0;
    border-bottom: 1px solid var(--rule);
}

.card-category {
    display: block;
    font-family: var(--font-ui);
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 0.5rem;
}

.card-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 700;
    color: var(--ink);
    line-height: 1.1;
    margin-bottom: 0.75rem;
}

.card:not(.card--feature) .card-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.card-excerpt {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--ink);
    margin-bottom: 0.75rem;
}

.card--feature .card-excerpt {
    font-size: 1.1rem;
    line-height: 1.85;
}

.card-meta {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--muted);
}

/* --- Pull Quotes --- */
.pull-quote {
    border-left: 3px solid var(--accent);
    padding-left: 1.5rem;
    margin: 2rem 0;
}

.pull-quote p {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 1.3rem;
    line-height: 1.7;
    color: var(--ink);
    margin-bottom: 0.75rem;
}

.pull-quote cite {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-style: normal;
    color: var(--muted);
}

/* --- Long Form Section --- */
.longform-article {
    padding: 1.5rem 0;
}

.longform-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--ink);
    line-height: 1.2;
    margin-bottom: 0.75rem;
}

.longform-excerpt {
    font-family: var(--font-body);
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--ink);
    margin-bottom: 0.75rem;
}

/* --- Concept Diagram --- */
#diagram-section {
    padding-bottom: 1rem;
}

.diagram-container {
    background: var(--surface);
    border: 1px solid var(--rule);
    padding: 2rem;
    margin: 1rem 0;
}

.concept-diagram {
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.diagram-label {
    font-family: 'Karla', sans-serif;
    font-size: 11px;
    fill: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.diagram-text {
    font-family: 'Crimson Text', serif;
    font-size: 13px;
    fill: var(--ink);
}

.diagram-caption {
    font-family: 'Karla', sans-serif;
    font-size: 10px;
    fill: var(--muted);
    font-style: italic;
}

.diagram-small {
    font-family: 'Crimson Text', serif;
    font-size: 11px;
    fill: var(--ink);
}

/* --- Marginalia Sidebar --- */
#marginalia {
    position: relative;
}

.marginalia-inner {
    position: sticky;
    top: 80px;
}

.margin-note {
    margin-bottom: 1.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--rule);
}

.margin-date {
    display: block;
    font-family: var(--font-ui);
    font-size: 0.65rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--secondary);
    margin-bottom: 0.25rem;
}

.margin-text {
    font-family: var(--font-ui);
    font-size: 0.75rem;
    line-height: 1.6;
    color: var(--secondary);
}

.margin-text em {
    font-style: italic;
}

.margin-link {
    color: var(--accent);
    cursor: pointer;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.margin-link:hover {
    border-bottom-color: var(--accent);
}

/* --- Highlight effect for margin notes --- */
.margin-note.highlighted {
    background-color: rgba(255, 243, 205, 0.4);
    margin-left: -0.5rem;
    padding: 0.5rem 0.5rem 0.5rem 0.75rem;
    transition: background-color 0.3s ease;
}

/* --- Footer --- */
#site-footer {
    padding-top: 1rem;
    padding-bottom: 3rem;
}

.footer-inner {
    text-align: center;
}

.footer-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--ink);
    margin-bottom: 0.25rem;
}

.footer-tagline {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.95rem;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.footer-copy {
    font-family: var(--font-ui);
    font-size: 0.7rem;
    color: var(--muted);
}

/* --- Card hover highlight (highlight annotation) --- */
.card.card--highlighted {
    background-color: rgba(255, 243, 205, 0.4);
    padding-left: 1rem;
    padding-right: 1rem;
    margin-left: -1rem;
    margin-right: -1rem;
    transition: background-color 0.3s ease, padding 0.3s ease;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .site-name {
        font-size: 3rem;
    }

    .featured-word {
        font-size: clamp(3rem, 12vw, 5rem);
    }

    #main-layout {
        grid-template-columns: 1fr;
        padding: 0 1.25rem;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .card--feature {
        grid-column: 1;
    }

    #marginalia {
        order: -1;
        border-bottom: 1px solid var(--rule);
        padding-bottom: 1.5rem;
        margin-bottom: 1rem;
    }

    .marginalia-inner {
        position: static;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .masthead-inner {
        padding: 0 1.25rem;
    }

    .card-title {
        font-size: 2rem;
    }

    .card:not(.card--feature) .card-title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .site-name {
        font-size: 2.25rem;
    }

    .marginalia-inner {
        grid-template-columns: 1fr;
    }

    .featured-intro {
        font-size: 1rem;
    }
}