/* ==========================================================================
   monopole.wiki — A Scholarly Reference
   Cream-parchment palette, serif-revival typography, sidebar + accordion.
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --cream-page: #F5F0E5;
    --sidebar-tan: #EDE5D8;
    --rule-brown: #D0C0A8;
    --page-tint: #F8F4EC;
    --page-edge: #E0D8C8;
    --ink-brown: #2A2018;
    --text-dark: #3A3028;
    --sepia-accent: #8A6840;
    --muted-stone: #8A8070;

    --font-serif-display: 'Playfair Display', 'Lora', Georgia, serif;
    --font-serif-body: 'Source Serif 4', 'Lora', Georgia, 'Times New Roman', serif;
    --font-mono: 'Inconsolata', 'Courier New', monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--cream-page);
    color: var(--text-dark);
    font-family: var(--font-serif-body);
    font-size: clamp(15px, 1vw, 17px);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(138, 104, 64, 0.025) 0%, transparent 60%),
        radial-gradient(circle at 80% 70%, rgba(138, 104, 64, 0.02) 0%, transparent 60%),
        repeating-linear-gradient(
            0deg,
            transparent 0px,
            transparent 2px,
            rgba(138, 104, 64, 0.012) 2px,
            rgba(138, 104, 64, 0.012) 3px
        );
}

/* ==========================================================================
   Sidebar
   ========================================================================== */

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    overflow-y: auto;
    background-color: var(--sidebar-tan);
    border-right: 1px solid var(--rule-brown);
    padding: 32px 20px;
    z-index: 100;
    box-shadow:
        2px 0 4px rgba(42, 32, 24, 0.04),
        4px 0 8px rgba(42, 32, 24, 0.02);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--rule-brown);
    border-radius: 3px;
}

.sidebar-inner {
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.brand {
    padding-bottom: 20px;
    border-bottom: 1px solid var(--rule-brown);
    margin-bottom: 24px;
}

.logotype {
    font-family: var(--font-serif-display);
    font-weight: 900;
    font-size: clamp(22px, 2.4vw, 30px);
    color: var(--ink-brown);
    letter-spacing: -0.02em;
    line-height: 1.05;
}

.brand-dot {
    color: var(--sepia-accent);
    font-style: italic;
}

.tagline {
    margin-top: 8px;
    font-family: var(--font-serif-body);
    font-style: italic;
    font-size: 12px;
    color: var(--muted-stone);
    line-height: 1.4;
}

.toc {
    flex: 1;
}

.toc-label {
    font-family: var(--font-serif-display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--sepia-accent);
    margin-bottom: 14px;
    border-bottom: 1px solid var(--rule-brown);
    padding-bottom: 8px;
}

.toc-list {
    list-style: none;
}

.toc-item {
    margin: 0;
}

.toc-link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 8px 12px 8px 14px;
    font-family: var(--font-serif-display);
    font-size: 14px;
    color: var(--text-dark);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: color 0.25s ease, border-left-color 0.25s ease, background-color 0.25s ease, font-weight 0.25s ease;
}

.toc-num {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--muted-stone);
    flex-shrink: 0;
    min-width: 28px;
}

.toc-link:hover {
    color: var(--ink-brown);
    background-color: rgba(208, 192, 168, 0.25);
}

.toc-link.active {
    border-left: 3px solid var(--sepia-accent);
    font-weight: 700;
    color: var(--ink-brown);
    background-color: rgba(208, 192, 168, 0.35);
}

.toc-link.active .toc-num {
    color: var(--sepia-accent);
}

.sidebar-footer {
    margin-top: 32px;
    padding-top: 20px;
    border-top: 1px solid var(--rule-brown);
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--muted-stone);
    line-height: 1.6;
}

.folio {
    letter-spacing: 0.04em;
}

.cite-mark {
    font-style: italic;
    margin-top: 4px;
}

/* ==========================================================================
   Main content
   ========================================================================== */

.main {
    margin-left: 280px;
    max-width: 880px;
    padding: 64px 56px 120px 56px;
    position: relative;
}

.article {
    background-color: var(--page-tint);
    padding: 56px 64px;
    box-shadow:
        2px 0 4px rgba(42, 32, 24, 0.08),
        4px 0 8px rgba(42, 32, 24, 0.04),
        6px 0 12px rgba(42, 32, 24, 0.02);
    border-left: 1px solid var(--page-edge);
    border-right: 1px solid var(--page-edge);
    position: relative;
}

.article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 6px;
    right: 6px;
    height: 1px;
    background-color: var(--page-edge);
    opacity: 0.6;
}

.article::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 6px;
    right: 6px;
    height: 1px;
    background-color: var(--page-edge);
    opacity: 0.6;
}

.section {
    padding: 36px 0;
    scroll-margin-top: 24px;
}

.section + .section {
    border-top: 1px solid var(--rule-brown);
}

.section-eyebrow {
    font-family: var(--font-serif-display);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.24em;
    color: var(--sepia-accent);
    margin-bottom: 12px;
    font-weight: 400;
}

.section-heading {
    font-family: var(--font-serif-display);
    font-weight: 700;
    font-size: clamp(28px, 3.2vw, 42px);
    color: var(--ink-brown);
    line-height: 1.15;
    margin-bottom: 28px;
    letter-spacing: -0.012em;
}

.lede {
    font-family: var(--font-serif-body);
    font-size: clamp(17px, 1.3vw, 20px);
    line-height: 1.65;
    color: var(--text-dark);
    margin-bottom: 24px;
    font-style: italic;
}

.lede::first-letter {
    font-family: var(--font-serif-display);
    font-style: normal;
    font-weight: 900;
    font-size: 3.6em;
    line-height: 0.85;
    float: left;
    margin: 6px 10px -2px 0;
    color: var(--ink-brown);
}

.body-paragraph {
    margin-bottom: 18px;
    text-align: justify;
    hyphens: auto;
}

.body-paragraph + .body-paragraph {
    text-indent: 1.6em;
}

.body-paragraph em {
    font-style: italic;
    color: var(--ink-brown);
}

.page-rule {
    height: 1px;
    background-color: var(--rule-brown);
    margin: 24px 0;
    position: relative;
}

.page-rule::before,
.page-rule::after {
    content: '';
    position: absolute;
    top: -3px;
    width: 7px;
    height: 7px;
    background-color: var(--page-tint);
    border: 1px solid var(--rule-brown);
    transform: rotate(45deg);
}

.page-rule::before {
    left: calc(50% - 28px);
}

.page-rule::after {
    left: calc(50% + 22px);
}

.page-rule::before {
    background-color: var(--sepia-accent);
    border-color: var(--sepia-accent);
}

.page-rule::after {
    background-color: var(--sepia-accent);
    border-color: var(--sepia-accent);
}

/* Marginalia (asides) */

.marginalia {
    background-color: var(--cream-page);
    border-left: 3px solid var(--sepia-accent);
    padding: 16px 22px 16px 26px;
    margin: 24px 0;
    font-family: var(--font-serif-body);
    font-style: italic;
    font-size: 14px;
    line-height: 1.65;
    color: var(--text-dark);
    position: relative;
}

.marginalia-mark {
    font-family: var(--font-serif-display);
    color: var(--sepia-accent);
    font-size: 22px;
    float: left;
    margin: -4px 12px 0 -6px;
    font-style: normal;
}

/* ==========================================================================
   Plate / illustration frames
   ========================================================================== */

.plate-frame {
    margin: 20px -8px 32px -8px;
    padding: 18px 18px 14px 18px;
    background-color: var(--cream-page);
    border: 1px solid var(--rule-brown);
    position: relative;
}

.plate-frame::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 4px;
    right: 4px;
    bottom: 4px;
    border: 1px solid var(--page-edge);
    pointer-events: none;
}

.plate-svg {
    display: block;
    width: 100%;
    height: auto;
    max-height: 280px;
    margin: 0 auto;
    position: relative;
}

.plate-caption {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--muted-stone);
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: 0.04em;
    font-style: italic;
}

/* ==========================================================================
   Accordion
   ========================================================================== */

.accordion {
    margin-top: 8px;
}

.accordion.sub {
    margin-top: 14px;
    margin-left: 20px;
    border-left: 1px dashed var(--rule-brown);
    padding-left: 16px;
}

.accordion-item {
    border-bottom: 1px solid var(--rule-brown);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    width: 100%;
    background: none;
    border: none;
    padding: 14px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    font-family: var(--font-serif-display);
    font-weight: 700;
    font-size: 17px;
    color: var(--ink-brown);
    transition: background-color 0.2s ease, color 0.2s ease;
    font-feature-settings: 'liga' 1, 'kern' 1;
}

.accordion.sub .accordion-header {
    font-size: 15px;
    font-weight: 400;
    font-style: italic;
    padding: 10px 8px;
}

.accordion-header:hover {
    background-color: rgba(208, 192, 168, 0.18);
    color: var(--sepia-accent);
}

.accordion-title {
    flex: 1;
    line-height: 1.4;
}

.accordion-title em {
    font-style: italic;
}

.accordion-icon {
    width: 14px;
    height: 14px;
    position: relative;
    flex-shrink: 0;
    margin-left: 16px;
    transition: transform 0.3s ease;
}

.accordion-icon::before,
.accordion-icon::after {
    content: '';
    position: absolute;
    background-color: var(--sepia-accent);
    transition: transform 0.3s ease, opacity 0.25s ease;
}

.accordion-icon::before {
    top: 50%;
    left: 0;
    width: 100%;
    height: 1.5px;
    transform: translateY(-50%);
}

.accordion-icon::after {
    left: 50%;
    top: 0;
    width: 1.5px;
    height: 100%;
    transform: translateX(-50%);
}

.accordion-item.open > .accordion-header > .accordion-icon::after {
    transform: translateX(-50%) scaleY(0);
    opacity: 0;
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

.accordion-item.open > .accordion-body {
    max-height: 9999px;
    transition: max-height 0.6s ease-in;
}

.accordion-content {
    padding: 0 12px 18px 12px;
}

.accordion.sub .accordion-content {
    padding: 0 8px 14px 8px;
}

/* ==========================================================================
   Code & Reference
   ========================================================================== */

.code-block {
    background-color: var(--cream-page);
    border: 1px solid var(--rule-brown);
    border-left: 3px solid var(--sepia-accent);
    padding: 16px 20px;
    margin: 16px 0;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.7;
    color: var(--ink-brown);
    overflow-x: auto;
    white-space: pre;
}

.ref-mono {
    font-family: var(--font-mono);
    font-size: 0.92em;
    color: var(--ink-brown);
    background-color: rgba(208, 192, 168, 0.25);
    padding: 1px 6px;
    border-radius: 1px;
}

/* ==========================================================================
   Data Tableau (table-like)
   ========================================================================== */

.data-tableau {
    margin: 24px 0;
    border: 1px solid var(--rule-brown);
    background-color: var(--cream-page);
}

.tableau-row {
    display: grid;
    grid-template-columns: 70px 1fr 110px;
    border-bottom: 1px solid var(--rule-brown);
    font-size: 14px;
}

.tableau-row:last-child {
    border-bottom: none;
}

.tableau-head {
    background-color: var(--sidebar-tan);
    font-family: var(--font-serif-display);
    font-weight: 700;
    color: var(--ink-brown);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.16em;
}

.tableau-cell {
    padding: 12px 16px;
    border-right: 1px solid var(--rule-brown);
    line-height: 1.5;
}

.tableau-cell:last-child {
    border-right: none;
}

.tableau-year {
    font-family: var(--font-mono);
    color: var(--sepia-accent);
    font-weight: 500;
}

.tableau-head .tableau-year {
    color: var(--ink-brown);
    font-family: var(--font-serif-display);
}

.tableau-event {
    font-family: var(--font-serif-body);
    color: var(--text-dark);
}

.tableau-result {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--muted-stone);
    font-style: italic;
}

.tableau-head .tableau-result {
    font-style: normal;
    font-family: var(--font-serif-display);
    color: var(--ink-brown);
}

.tableau-row:not(.tableau-head):hover {
    background-color: rgba(208, 192, 168, 0.18);
}

/* ==========================================================================
   Lists
   ========================================================================== */

.entry-list {
    list-style: none;
    margin-left: 0;
}

.entry-list li {
    position: relative;
    padding: 8px 0 8px 26px;
    border-bottom: 1px dotted var(--rule-brown);
    line-height: 1.65;
}

.entry-list li:last-child {
    border-bottom: none;
}

.entry-list li::before {
    content: '\203B';
    position: absolute;
    left: 4px;
    top: 8px;
    color: var(--sepia-accent);
    font-family: var(--font-serif-display);
    font-size: 14px;
}

.entry-term {
    font-weight: 700;
    color: var(--ink-brown);
    font-family: var(--font-serif-display);
}

.reference-list {
    list-style: none;
    counter-reset: ref;
}

.reference-entry {
    display: flex;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--rule-brown);
    font-size: 13px;
    line-height: 1.6;
}

.reference-entry:last-child {
    border-bottom: none;
}

.ref-mark {
    font-family: var(--font-mono);
    color: var(--sepia-accent);
    font-weight: 500;
    flex-shrink: 0;
    min-width: 30px;
}

.reference-entry .ref-mono {
    background-color: transparent;
    padding: 0;
    color: var(--text-dark);
}

/* ==========================================================================
   Closing
   ========================================================================== */

.finis {
    text-align: center;
    font-family: var(--font-serif-display);
    font-style: italic;
    color: var(--sepia-accent);
    letter-spacing: 0.3em;
    font-size: 14px;
    margin-top: 24px;
    text-transform: uppercase;
}

/* ==========================================================================
   Back to top
   ========================================================================== */

.back-to-top {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 44px;
    height: 44px;
    border: 1px solid var(--rule-brown);
    background-color: var(--page-tint);
    color: var(--sepia-accent);
    font-family: var(--font-serif-display);
    font-size: 18px;
    cursor: pointer;
    border-radius: 0;
    box-shadow:
        2px 2px 4px rgba(42, 32, 24, 0.08),
        4px 4px 8px rgba(42, 32, 24, 0.04);
    opacity: 0;
    transform: translateY(8px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.2s ease, color 0.2s ease;
    z-index: 200;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    background-color: var(--sepia-accent);
    color: var(--page-tint);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1024px) {
    .main {
        padding: 48px 36px 100px 36px;
    }
    .article {
        padding: 44px 44px;
    }
}

@media (max-width: 820px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        max-height: none;
        border-right: none;
        border-bottom: 1px solid var(--rule-brown);
        padding: 24px 24px;
    }
    .sidebar-footer {
        margin-top: 16px;
        padding-top: 12px;
    }
    .main {
        margin-left: 0;
        max-width: 100%;
        padding: 32px 20px 80px 20px;
    }
    .article {
        padding: 32px 24px;
    }
    .toc-list {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0 8px;
    }
}

@media (max-width: 540px) {
    .toc-list {
        grid-template-columns: 1fr;
    }
    .article {
        padding: 24px 18px;
    }
    .lede::first-letter {
        font-size: 3em;
    }
    .tableau-row {
        grid-template-columns: 56px 1fr 90px;
        font-size: 13px;
    }
    .tableau-cell {
        padding: 10px 10px;
    }
    .accordion.sub {
        margin-left: 8px;
        padding-left: 12px;
    }
}