/* =========================================================================
   diplomacy.day — a chronicle of the quiet arts
   Analogous warm, flat matte, f-pattern, dark-academia
   Implementation note: IntersectionObserver IntersectionObserver` with generous `rootMargin` for scroll-triggered animations to prevent layout thrashing.
   ========================================================================= */

:root {
    --parchment-dark: #1c1714;
    --treaty-umber: #2a2118;
    --embassy-walnut: #3d3024;
    --vellum-cream: #e8dcc4;
    --ink-sepia: #b8a68e;
    --seal-crimson: #8b3a3a;
    --brass-patina: #a8894a;
    --candlelight-amber: #d4a44a;

    --font-display: "Caveat", "Kalam", "Segoe Script", cursive;
    --font-body: "Libre Baskerville", "Georgia", serif;

    --measure: 68ch;
    --col-gap: 2rem;
    --section-gap: clamp(4rem, 10vh, 8rem);
}

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

html {
    scroll-behavior: smooth;
    background: var(--parchment-dark);
}

body {
    font-family: var(--font-body);
    color: var(--vellum-cream);
    background-color: var(--parchment-dark);
    line-height: 1.75;
    font-size: clamp(1rem, 1.15vw, 1.13rem);
    overflow-x: hidden;
    cursor: default;
    position: relative;
    min-height: 100vh;
}

/* --- Cipher Grid Background ------------------------------------------ */
.cipher-grid {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.035;
    background-image:
        repeating-linear-gradient(0deg,
            transparent 0,
            transparent 29px,
            rgba(232, 220, 196, 0.4) 29px,
            rgba(232, 220, 196, 0.4) 30px),
        repeating-linear-gradient(90deg,
            transparent 0,
            transparent 29px,
            rgba(232, 220, 196, 0.4) 29px,
            rgba(232, 220, 196, 0.4) 30px);
    background-size: 30px 30px;
}

.cipher-grid::after {
    content: "E N I G M A K E Y F E U M B E R P A R C H M E N T V E L L U M S E A L T R E A T Y C I P H E R W A X  ";
    position: absolute;
    inset: 0;
    font-family: "Courier New", monospace;
    font-size: 10px;
    letter-spacing: 14px;
    color: var(--vellum-cream);
    line-height: 30px;
    white-space: pre-wrap;
    overflow: hidden;
    word-break: break-all;
    opacity: 0.6;
    mix-blend-mode: screen;
}

/* --- Connection SVG overlay ------------------------------------------ */
#connection-svg {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1;
    overflow: visible;
}

#connection-svg path {
    fill: none;
    stroke: var(--brass-patina);
    stroke-width: 0.6;
    stroke-dasharray: 6 4;
    opacity: 0.28;
}

#connection-svg circle {
    fill: var(--seal-crimson);
    opacity: 0.5;
}

/* --- Top Navigation -------------------------------------------------- */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    background-color: rgba(61, 48, 36, 0.88);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: background-color 0.4s ease, transform 0.4s ease;
}

.top-nav.scrolled {
    background-color: rgba(28, 23, 20, 0.92);
}

.nav-inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 2rem;
    padding: 0.9rem clamp(1rem, 4vw, 3rem);
    max-width: 1600px;
    margin: 0 auto;
}

.nav-brand {
    display: inline-flex;
    align-items: baseline;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--vellum-cream);
}

.brand-mark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--candlelight-amber);
    line-height: 1;
    letter-spacing: -0.02em;
}

.brand-word {
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.2em;
    font-size: 0.78rem;
    color: var(--ink-sepia);
}

.nav-links {
    display: flex;
    list-style: none;
    justify-content: center;
    gap: clamp(0.6rem, 2vw, 2rem);
    flex-wrap: wrap;
}

.nav-links a {
    position: relative;
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.15em;
    font-size: 0.72rem;
    color: var(--ink-sepia);
    text-decoration: none;
    padding: 0.35rem 0.2rem;
    transition: color 0.3s ease;
}

.nav-links a::before {
    content: attr(data-ch);
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.95rem;
    color: var(--brass-patina);
    margin-right: 0.4rem;
    letter-spacing: 0;
    transform: translateY(1px);
    transition: color 0.3s ease;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 1px;
    background: var(--seal-crimson);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.4s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--candlelight-amber);
}

.nav-links a:hover::before,
.nav-links a.active::before {
    color: var(--candlelight-amber);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    transform: scaleX(1);
}

.nav-date {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    line-height: 1.1;
}

.date-label {
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.2em;
    font-size: 0.62rem;
    color: var(--ink-sepia);
}

.date-value {
    font-family: var(--font-display);
    color: var(--brass-patina);
    font-size: 1.05rem;
}

.nav-rule {
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--brass-patina) 30%,
        var(--seal-crimson) 50%,
        var(--brass-patina) 70%,
        transparent 100%);
    opacity: 0.4;
}

/* --- Main content offset --------------------------------------------- */
main {
    position: relative;
    z-index: 2;
}

/* --- Opening Tableau ------------------------------------------------- */
.opening-tableau {
    position: relative;
    min-height: 100vh;
    width: 100%;
    overflow: hidden;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    align-items: center;
    isolation: isolate;
}

.crossfade-stack {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.crossfade-img {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    will-change: opacity;
    animation: fade 24s infinite;
    filter: sepia(0.35) contrast(1.15) brightness(0.45) saturate(0.55);
}

.img-1 {
    animation-delay: 0s;
    background-image:
        linear-gradient(180deg,
            rgba(28, 23, 20, 0.55) 0%,
            rgba(28, 23, 20, 0.75) 100%),
        radial-gradient(ellipse 70% 50% at 30% 40%,
            rgba(168, 137, 74, 0.6) 0%,
            rgba(61, 48, 36, 0.8) 40%,
            rgba(28, 23, 20, 1) 100%),
        linear-gradient(115deg, #2a2118 0%, #3d3024 60%, #1c1714 100%);
}

.img-2 {
    animation-delay: -8s;
    background-image:
        linear-gradient(180deg,
            rgba(28, 23, 20, 0.6) 0%,
            rgba(28, 23, 20, 0.85) 100%),
        radial-gradient(ellipse 60% 60% at 70% 35%,
            rgba(212, 164, 74, 0.5) 0%,
            rgba(61, 48, 36, 0.85) 35%,
            rgba(28, 23, 20, 1) 100%),
        repeating-linear-gradient(45deg,
            rgba(184, 166, 142, 0.06) 0 2px,
            transparent 2px 8px),
        linear-gradient(195deg, #3d3024 0%, #2a2118 55%, #1c1714 100%);
}

.img-3 {
    animation-delay: -16s;
    background-image:
        linear-gradient(180deg,
            rgba(28, 23, 20, 0.5) 0%,
            rgba(28, 23, 20, 0.78) 100%),
        radial-gradient(ellipse 80% 55% at 50% 60%,
            rgba(139, 58, 58, 0.42) 0%,
            rgba(61, 48, 36, 0.85) 45%,
            rgba(28, 23, 20, 1) 100%),
        linear-gradient(160deg, #2a2118 0%, #3d3024 40%, #1c1714 90%);
}

.tableau-vignette {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at center,
        transparent 30%,
        rgba(28, 23, 20, 0.55) 75%,
        rgba(28, 23, 20, 0.95) 100%);
    box-shadow: inset 0 0 200px rgba(28, 23, 20, 0.85);
}

@keyframes fade {
    0% { opacity: 0; }
    8% { opacity: 1; }
    33% { opacity: 1; }
    41% { opacity: 0; }
    100% { opacity: 0; }
}

.opening-content {
    grid-column: 2 / 10;
    position: relative;
    z-index: 3;
    padding: 2rem 1rem;
}

.opening-meta {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 1px solid var(--brass-patina);
    max-width: max-content;
}

.meta-seal {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: var(--seal-crimson);
    transform: rotate(45deg);
    box-shadow:
        0 0 0 2px var(--embassy-walnut),
        0 0 0 3px var(--seal-crimson);
}

.meta-label {
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.22em;
    font-size: 0.7rem;
    color: var(--ink-sepia);
}

.opening-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(3rem, 12vw, 10rem);
    line-height: 0.95;
    letter-spacing: -0.02em;
    color: var(--vellum-cream);
    margin-bottom: 1.5rem;
    text-shadow:
        0 2px 0 rgba(28, 23, 20, 0.6),
        0 0 30px rgba(212, 164, 74, 0.08);
}

.title-line {
    display: inline-block;
}

.title-char {
    display: inline-block;
    opacity: 0;
    transform: translateY(12px);
    animation: titleDrop 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
}

.title-char.dot {
    color: var(--candlelight-amber);
}

@keyframes titleDrop {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.opening-epigraph {
    font-family: var(--font-body);
    font-style: italic;
    color: var(--ink-sepia);
    font-size: clamp(1rem, 1.5vw, 1.25rem);
    max-width: 50ch;
    line-height: 1.6;
    opacity: 0;
    animation: fadeUp 1.4s ease 2.2s forwards;
}

.opening-attribution {
    margin-top: 1.2rem;
    opacity: 0;
    animation: fadeUp 1.4s ease 2.8s forwards;
}

.attr-name {
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.15em;
    color: var(--brass-patina);
    font-size: 0.72rem;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.scroll-cue {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    z-index: 3;
    opacity: 0;
    animation: fadeUp 1.4s ease 3.4s forwards;
}

.cue-text {
    font-family: var(--font-display);
    color: var(--brass-patina);
    font-size: 1rem;
    letter-spacing: 0.04em;
}

.cue-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg,
        var(--brass-patina),
        transparent);
    animation: cuePulse 2.4s ease-in-out infinite;
}

@keyframes cuePulse {
    0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
    50% { opacity: 1; transform: scaleY(1); }
}

/* --- Prologue -------------------------------------------------------- */
.prologue {
    padding: clamp(4rem, 8vh, 6rem) clamp(1rem, 4vw, 3rem);
    background: var(--parchment-dark);
    position: relative;
}

.prologue-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--col-gap);
    max-width: 1600px;
    margin: 0 auto;
}

.prologue-margin {
    grid-column: 1 / 2;
    display: flex;
    justify-content: flex-end;
    padding-top: 1rem;
}

.rotated-label {
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.3em;
    font-size: 0.72rem;
    color: var(--brass-patina);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    white-space: nowrap;
    padding: 0.4rem 0.25rem;
    border-left: 1px solid var(--embassy-walnut);
}

.prologue-body {
    grid-column: 2 / 10;
}

.prologue-drop {
    font-size: clamp(1.1rem, 1.6vw, 1.35rem);
    line-height: 1.8;
    color: var(--vellum-cream);
    font-style: italic;
    max-width: var(--measure);
}

.dropcap {
    font-family: var(--font-display);
    font-weight: 700;
    font-style: normal;
    float: left;
    font-size: 5.4rem;
    line-height: 0.9;
    padding: 0.25rem 0.6rem 0 0;
    color: var(--candlelight-amber);
    text-shadow: 0 2px 0 rgba(28, 23, 20, 0.6);
}

.diplomatic-rule {
    margin-top: 3rem;
    border-top: 1px solid var(--embassy-walnut);
    border-bottom: 1px solid var(--embassy-walnut);
    height: 5px;
    position: relative;
    max-width: var(--measure);
}

.diplomatic-rule::before {
    content: attr(data-ornament);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: var(--parchment-dark);
    padding: 0 0.8rem;
    color: var(--seal-crimson);
    font-size: 0.9rem;
    letter-spacing: 0;
}

/* --- Chapters: F-pattern 12-column grid ------------------------------ */
.chapter {
    position: relative;
    padding: var(--section-gap) clamp(1rem, 4vw, 3rem);
    background: var(--parchment-dark);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease, transform 1s ease;
}

.chapter.revealed {
    opacity: 1;
    transform: translateY(0);
}

.chapter:nth-of-type(even) {
    background: var(--treaty-umber);
}

.chapter-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--col-gap);
    max-width: 1600px;
    margin: 0 auto;
    position: relative;
}

.chapter-marginalia {
    grid-column: 1 / 2;
    display: flex;
    justify-content: flex-end;
    padding-top: 0.5rem;
}

.chapter-body {
    grid-column: 2 / 10;
    max-width: 100%;
}

.chapter-aside {
    grid-column: 10 / 13;
    position: relative;
}

.aside-sticky {
    position: sticky;
    top: 6rem;
    padding: 1.5rem 1.2rem;
    background: rgba(61, 48, 36, 0.35);
    border-left: 2px solid var(--brass-patina);
    contain: layout;
}

.aside-label {
    display: block;
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.25em;
    font-size: 0.68rem;
    color: var(--brass-patina);
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--embassy-walnut);
    padding-bottom: 0.5rem;
}

.aside-note {
    font-family: var(--font-display);
    font-size: clamp(0.9rem, 1.1vw, 1.05rem);
    line-height: 1.45;
    color: var(--ink-sepia);
    margin-bottom: 1rem;
    letter-spacing: 0.01em;
}

.aside-note strong {
    color: var(--candlelight-amber);
    font-weight: 700;
}

.aside-link {
    color: var(--seal-crimson);
    text-decoration: none;
    font-weight: 700;
    transition: color 0.3s ease;
}

.aside-link:hover {
    color: var(--candlelight-amber);
}

/* Chapter header */
.chapter-header {
    margin-bottom: 2.5rem;
    position: relative;
}

.chapter-num {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(3rem, 5vw, 4.2rem);
    line-height: 1;
    color: var(--brass-patina);
    float: left;
    margin: 0.3rem 0.8rem 0 0;
    text-shadow: 0 2px 0 rgba(28, 23, 20, 0.7);
}

.chapter-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    line-height: 1.05;
    letter-spacing: -0.01em;
    color: var(--vellum-cream);
}

.chapter-subtitle {
    clear: left;
    margin-top: 0.8rem;
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 1.2vw, 1.1rem);
    color: var(--ink-sepia);
    max-width: var(--measure);
}

/* Ink splatter */
.ink-splatter {
    position: absolute;
    top: -10px;
    left: -30px;
    width: 80px;
    height: 80px;
    pointer-events: none;
}

.splat {
    position: absolute;
    background: var(--seal-crimson);
    border-radius: 50%;
    opacity: 0.35;
}

.splat-a { width: 8px; height: 6px; top: 10px; left: 20px; transform: rotate(12deg); }
.splat-b { width: 4px; height: 3px; top: 28px; left: 40px; transform: rotate(-18deg); }
.splat-c { width: 3px; height: 2px; top: 42px; left: 12px; opacity: 0.2; }

/* Chapter text */
.chapter-text {
    max-width: var(--measure);
}

.chapter-text p {
    margin-bottom: 1.6rem;
    color: var(--vellum-cream);
}

.chapter-text p + p {
    text-indent: 2em;
}

.firstline {
    font-variant: small-caps;
    letter-spacing: 0.06em;
    color: var(--candlelight-amber);
    font-size: 0.96em;
}

.inline-link {
    color: var(--seal-crimson);
    text-decoration: none;
    border-bottom: 1px dotted var(--seal-crimson);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.inline-link:hover {
    color: var(--candlelight-amber);
    border-bottom-color: var(--candlelight-amber);
}

.amber { color: var(--candlelight-amber); font-weight: 700; }
.crimson { color: var(--seal-crimson); font-weight: 700; }

/* Pull quote */
.pull-quote {
    position: relative;
    margin: 2.5rem 0 2.5rem 1rem;
    padding: 1.2rem 1.5rem 1.2rem 2.2rem;
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(1.05rem, 1.5vw, 1.25rem);
    color: var(--vellum-cream);
    border-left: 3px solid var(--brass-patina);
    background: rgba(61, 48, 36, 0.25);
}

.pull-quote.crimson-bar { border-left-color: var(--seal-crimson); }
.pull-quote.amber-bar { border-left-color: var(--candlelight-amber); }

.quote-mark {
    position: absolute;
    left: 0.4rem;
    top: -0.4rem;
    font-family: var(--font-display);
    font-size: 3.2rem;
    color: var(--seal-crimson);
    line-height: 1;
}

.quote-cite {
    display: block;
    margin-top: 0.8rem;
    font-style: normal;
    font-variant: small-caps;
    letter-spacing: 0.2em;
    font-size: 0.68rem;
    color: var(--ink-sepia);
}

/* Two-column inside chapter */
.two-column {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2.4rem 0;
    padding: 1.5rem 0;
    border-top: 1px solid var(--embassy-walnut);
    border-bottom: 1px solid var(--embassy-walnut);
}

.col-head {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--candlelight-amber);
    font-size: clamp(1.4rem, 2vw, 1.8rem);
    line-height: 1;
    margin-bottom: 0.6rem;
    letter-spacing: -0.01em;
}

.col p {
    font-size: 0.95em;
}

/* --- Wide Photograph (Chapter 3) ------------------------------------- */
.wide-photograph {
    margin: 2rem 0 2.5rem;
    position: relative;
}

.wide-photo-inner {
    width: 100%;
    aspect-ratio: 16 / 7;
    border: 3px solid var(--embassy-walnut);
    box-shadow:
        inset 0 0 60px rgba(28, 23, 20, 0.8),
        0 8px 30px rgba(0, 0, 0, 0.5);
    filter: sepia(0.25) contrast(1.1) brightness(0.85) saturate(0.7);
    background-size: cover;
    background-position: center;
    transition: filter 1.2s ease;
    cursor: crosshair;
    position: relative;
    overflow: hidden;
}

.photo-table {
    background-image:
        linear-gradient(125deg,
            rgba(28, 23, 20, 0.4) 0%,
            rgba(28, 23, 20, 0.1) 30%,
            rgba(28, 23, 20, 0.6) 90%),
        radial-gradient(ellipse 60% 40% at 50% 55%,
            rgba(212, 164, 74, 0.45) 0%,
            rgba(139, 105, 58, 0.3) 35%,
            rgba(61, 48, 36, 0.8) 70%,
            rgba(28, 23, 20, 1) 100%),
        repeating-linear-gradient(90deg,
            rgba(61, 48, 36, 0.3) 0 30px,
            rgba(42, 33, 24, 0.3) 30px 60px),
        linear-gradient(180deg, #2a2118, #1c1714);
}

.wide-photo-inner:hover {
    filter: sepia(0.1) contrast(1.15) brightness(0.95) saturate(0.9);
}

.wide-photo-inner::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%),
        transparent 30%,
        rgba(212, 164, 74, 0.18) 31%,
        transparent 70%);
    opacity: 0;
    transform: scale(0);
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.wide-photo-inner.ripple::after {
    animation: ripple-expand 0.8s ease-out forwards;
}

@keyframes ripple-expand {
    0% { transform: scale(0); opacity: 1; }
    100% { transform: scale(3); opacity: 0; }
}

.photo-caption {
    margin-top: 0.8rem;
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.18em;
    font-size: 0.72rem;
    color: var(--ink-sepia);
    max-width: var(--measure);
    line-height: 1.6;
}

.cap-no {
    color: var(--brass-patina);
    margin-right: 0.5rem;
}

/* --- Cipher display (Chapter 2) -------------------------------------- */
.cipher-display {
    margin: 2rem 0;
    padding: 1.2rem 1.4rem;
    background: rgba(61, 48, 36, 0.3);
    border: 1px solid var(--embassy-walnut);
    font-family: "Courier New", monospace;
    overflow: hidden;
}

.cipher-row {
    color: var(--brass-patina);
    font-size: 0.85rem;
    letter-spacing: 0.35em;
    line-height: 2;
    white-space: nowrap;
    overflow: hidden;
}

.cipher-row::before {
    content: attr(data-cipher);
    display: inline-block;
    animation: cipherScroll 40s linear infinite;
    padding-right: 4rem;
}

.cipher-row:nth-child(2)::before { animation-duration: 55s; animation-direction: reverse; color: var(--ink-sepia); }
.cipher-row:nth-child(3)::before { animation-duration: 45s; color: var(--candlelight-amber); opacity: 0.7; }
.cipher-row:nth-child(4)::before { animation-duration: 60s; animation-direction: reverse; color: var(--seal-crimson); opacity: 0.7; }

@keyframes cipherScroll {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

/* --- Network diagram (Chapter 4) ------------------------------------- */
.network-diagram {
    position: relative;
    width: 100%;
    max-width: 460px;
    aspect-ratio: 1 / 1;
    margin: 2.5rem auto;
    border: 1px solid var(--embassy-walnut);
    background: rgba(61, 48, 36, 0.25);
    padding: 1rem;
}

.network-svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.network-svg path {
    fill: none;
    stroke: var(--brass-patina);
    stroke-width: 1;
    stroke-dasharray: 4 3;
    opacity: 0.5;
    animation: pathFlow 6s linear infinite;
}

@keyframes pathFlow {
    to { stroke-dashoffset: -20; }
}

.node {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--seal-crimson);
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(139, 58, 58, 0.25);
    z-index: 2;
    animation: pulse 3s ease-in-out infinite;
}

.node::after {
    content: attr(data-node);
    position: absolute;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.18em;
    font-size: 0.6rem;
    color: var(--ink-sepia);
    white-space: nowrap;
}

.node-n { top: 8%; left: calc(50% - 6px); }
.node-ne { top: 18%; right: 12%; }
.node-e { top: calc(50% - 6px); right: 8%; }
.node-se { bottom: 18%; right: 12%; }
.node-s { bottom: 8%; left: calc(50% - 6px); }
.node-sw { bottom: 18%; left: 12%; }
.node-w { top: calc(50% - 6px); left: 8%; }
.node-nw { top: 18%; left: 12%; }

.node-center {
    top: calc(50% - 10px);
    left: calc(50% - 10px);
    width: 20px;
    height: 20px;
    background: var(--candlelight-amber);
    box-shadow: 0 0 0 4px rgba(212, 164, 74, 0.3);
    animation-duration: 2s;
    color: var(--parchment-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
}

.node-center::after {
    content: "";
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.25); opacity: 0.75; }
}

/* --- Convergence diagram (Chapter 5) --------------------------------- */
.convergence-diagram {
    margin: 2.5rem 0;
    width: 100%;
    max-width: 600px;
}

.convergence-svg {
    width: 100%;
    height: auto;
}

.convergence-svg path {
    fill: none;
    stroke: var(--brass-patina);
    stroke-width: 1.2;
    stroke-dasharray: 5 3;
    opacity: 0.6;
    animation: pathFlow 5s linear infinite;
}

.converge-node {
    fill: var(--candlelight-amber);
    filter: drop-shadow(0 0 6px rgba(212, 164, 74, 0.6));
}

.converge-ring {
    fill: none;
    stroke: var(--seal-crimson);
    stroke-width: 1;
    opacity: 0.6;
    transform-origin: 300px 100px;
    animation: ringExpand 3s ease-out infinite;
}

@keyframes ringExpand {
    0% { r: 10; opacity: 0.7; }
    100% { r: 40; opacity: 0; }
}

/* --- Interlude (chapter break) --------------------------------------- */
.interlude {
    position: relative;
    height: 70vh;
    min-height: 420px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.interlude-photo {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: sepia(0.3) contrast(1.15) brightness(0.55) saturate(0.6);
    border-top: 3px solid var(--embassy-walnut);
    border-bottom: 3px solid var(--embassy-walnut);
}

.photo-interlude-1 {
    background-image:
        linear-gradient(180deg, rgba(28, 23, 20, 0.55), rgba(28, 23, 20, 0.75)),
        radial-gradient(ellipse 50% 60% at 35% 50%,
            rgba(212, 164, 74, 0.5),
            rgba(61, 48, 36, 0.85) 50%,
            rgba(28, 23, 20, 1) 100%),
        linear-gradient(110deg, #3d3024, #1c1714);
}

.photo-interlude-2 {
    background-image:
        linear-gradient(180deg, rgba(28, 23, 20, 0.55), rgba(28, 23, 20, 0.75)),
        repeating-linear-gradient(75deg,
            rgba(184, 166, 142, 0.06) 0 3px,
            transparent 3px 10px),
        radial-gradient(ellipse 60% 50% at 65% 45%,
            rgba(168, 137, 74, 0.45),
            rgba(42, 33, 24, 0.85) 50%,
            rgba(28, 23, 20, 1) 100%),
        linear-gradient(200deg, #2a2118, #1c1714);
}

.photo-interlude-3 {
    background-image:
        linear-gradient(180deg, rgba(28, 23, 20, 0.5), rgba(28, 23, 20, 0.78)),
        radial-gradient(ellipse 70% 50% at 50% 55%,
            rgba(139, 58, 58, 0.4),
            rgba(61, 48, 36, 0.85) 45%,
            rgba(28, 23, 20, 1) 100%),
        linear-gradient(150deg, #3d3024, #1c1714);
}

.photo-interlude-4 {
    background-image:
        linear-gradient(180deg, rgba(28, 23, 20, 0.6), rgba(28, 23, 20, 0.85)),
        radial-gradient(ellipse 40% 60% at 45% 50%,
            rgba(212, 164, 74, 0.35),
            rgba(42, 33, 24, 0.9) 50%,
            rgba(28, 23, 20, 1) 100%),
        repeating-linear-gradient(90deg,
            rgba(212, 164, 74, 0.05) 0 1px,
            transparent 1px 20px),
        linear-gradient(180deg, #2a2118, #1c1714);
}

.interlude-overlay {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem;
}

/* Wax Seal */
.wax-seal {
    --seal-size: 110px;
    width: var(--seal-size);
    height: var(--seal-size);
    margin: 0 auto 1.8rem;
    position: relative;
    border-radius: 50%;
    background:
        radial-gradient(circle at 35% 30%,
            #c85959 0%,
            var(--seal-crimson) 30%,
            #6a2a2a 70%,
            #4a1c1c 100%);
    box-shadow:
        inset -8px -10px 20px rgba(42, 14, 14, 0.65),
        inset 8px 10px 14px rgba(255, 180, 180, 0.12),
        0 6px 18px rgba(0, 0, 0, 0.55),
        0 0 0 2px rgba(139, 58, 58, 0.25),
        0 0 0 3px rgba(61, 48, 36, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--parchment-dark);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.03em;
    animation: sealRotate 60s linear infinite;
    text-shadow: 0 1px 0 rgba(255, 220, 220, 0.12);
}

.wax-seal.alt {
    background:
        radial-gradient(circle at 35% 30%,
            #e6b95e 0%,
            var(--brass-patina) 30%,
            #6d5528 70%,
            #4a3a1a 100%);
    color: var(--parchment-dark);
    animation-direction: reverse;
}

.wax-seal.small {
    --seal-size: 64px;
    font-size: 1.2rem;
}

.wax-seal::before {
    content: "";
    position: absolute;
    inset: 8%;
    border: 1px dashed rgba(28, 23, 20, 0.35);
    border-radius: 50%;
    pointer-events: none;
}

.wax-seal::after {
    content: "";
    position: absolute;
    inset: 18%;
    border: 1px solid rgba(28, 23, 20, 0.28);
    border-radius: 50%;
    pointer-events: none;
}

.seal-mono {
    position: relative;
    z-index: 2;
    transform: rotate(0);
}

@keyframes sealRotate {
    from { transform: rotate(0); }
    to { transform: rotate(360deg); }
}

.interlude-caption {
    font-family: var(--font-display);
    font-size: clamp(1.1rem, 1.8vw, 1.5rem);
    color: var(--vellum-cream);
    max-width: 40ch;
    margin: 0 auto;
    line-height: 1.4;
}

/* --- Footer ---------------------------------------------------------- */
.site-footer {
    padding: clamp(4rem, 8vh, 6rem) clamp(1rem, 4vw, 3rem) 3rem;
    background: var(--treaty-umber);
    border-top: 1px solid var(--embassy-walnut);
    position: relative;
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: 2rem;
    align-items: center;
}

.footer-rule {
    grid-column: 1 / -1;
    border-top: 1px solid var(--embassy-walnut);
    border-bottom: 1px solid var(--embassy-walnut);
    height: 5px;
    position: relative;
    margin-bottom: 1rem;
}

.footer-rule::before {
    content: attr(data-ornament);
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: var(--treaty-umber);
    padding: 0 0.8rem;
    color: var(--seal-crimson);
    font-size: 0.9rem;
}

.footer-brand-big {
    display: block;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2.4rem;
    color: var(--candlelight-amber);
    line-height: 1;
}

.footer-brand-sub {
    display: block;
    margin-top: 0.4rem;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.9rem;
    color: var(--ink-sepia);
}

.footer-meta {
    margin-top: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    font-family: var(--font-body);
    font-variant: small-caps;
    letter-spacing: 0.18em;
    font-size: 0.68rem;
    color: var(--ink-sepia);
}

/* --- Ripple layer (global click ripples) ----------------------------- */
#ripple-layer {
    position: fixed;
    inset: 0;
    z-index: 999;
    pointer-events: none;
    overflow: hidden;
}

.click-ripple {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: radial-gradient(circle,
        rgba(139, 58, 58, 0.45) 0%,
        rgba(139, 58, 58, 0.2) 40%,
        transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    animation: clickRipple 0.8s ease-out forwards;
    pointer-events: none;
}

@keyframes clickRipple {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(18); opacity: 0; }
}

/* --- Section reveal animation ---------------------------------------- */
.reveal-clip {
    clip-path: circle(0% at 50% 50%);
    transition: clip-path 1.2s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.reveal-clip.revealed {
    clip-path: circle(150% at 50% 50%);
}

/* --- Responsive ------------------------------------------------------ */
@media (max-width: 960px) {
    .nav-inner {
        grid-template-columns: 1fr auto;
    }

    .nav-links {
        grid-column: 1 / -1;
        order: 3;
        justify-content: flex-start;
        gap: 0.6rem 1.2rem;
        padding-top: 0.6rem;
        border-top: 1px solid var(--embassy-walnut);
    }

    .nav-date {
        display: none;
    }

    .chapter-grid,
    .prologue-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .chapter-marginalia,
    .prologue-margin {
        grid-column: 1 / -1;
        justify-content: flex-start;
    }

    .rotated-label {
        writing-mode: horizontal-tb;
        transform: none;
        border-left: none;
        border-bottom: 1px solid var(--embassy-walnut);
        padding: 0.25rem 0.5rem;
    }

    .chapter-body {
        grid-column: 1 / -1;
    }

    .chapter-aside {
        grid-column: 1 / -1;
    }

    .aside-sticky {
        position: static;
    }

    .two-column {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .opening-content {
        grid-column: 1 / -1;
        padding: 2rem clamp(1rem, 4vw, 3rem);
    }
}

@media (max-width: 600px) {
    .nav-links a {
        font-size: 0.62rem;
    }

    .opening-title {
        font-size: clamp(3rem, 18vw, 6rem);
    }

    .chapter-title {
        font-size: clamp(2rem, 9vw, 3.4rem);
    }
}

/* --- Reduce motion --------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}