/* =========================================================
   LLITTL.com — a small collection of large ideas
   Light-academia, asymmetric, epistolary.
   Interaction:** IntersectionObserver with a threshold of 0.15 to trigger animations. Interstitial moments**: Between major sections.
   ========================================================= */

:root {
    /* Palette — from DESIGN.md */
    --c-parchment: #f5f0e8;
    --c-linen: #ece5d5;
    --c-walnut: #3b3228;
    --c-ink-faded: #6b5e50;
    --c-amber: #c4903d;
    --c-blue: #3d6a8c;
    --c-rose: #c9857a;
    --c-straw: #d4c9b8;
    --c-shadow: #1e1a15;

    /* Typography */
    --f-sans: "Commissioner", "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --f-serif: "Cormorant Garamond", "Cormorant", "Lora", Georgia, "Times New Roman", serif;
    --f-mono: "Space Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

    /* Rhythm */
    --ease-vellum: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --measure: 62ch;
    --rail-w: 5.5rem;
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    background: var(--c-parchment);
    color: var(--c-walnut);
    font-family: var(--f-sans);
    font-weight: 400;
    font-size: 1.05rem;
    line-height: 1.72;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-synthesis: none;
}

::selection {
    background: rgba(196, 144, 61, 0.28);
    color: var(--c-shadow);
}

/* -------- Backdrop layers: grid, noise -------- */

.grid-underlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background-image:
        linear-gradient(to right, rgba(212, 201, 184, 0.55) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(212, 201, 184, 0.35) 1px, transparent 1px);
    background-size: 96px 96px, 96px 96px;
    background-position: 0 0, 0 0;
    opacity: 0.22;
    will-change: transform;
    transition: transform 0.6s var(--ease-vellum);
}

.noise-overlay {
    position: fixed;
    inset: -5%;
    pointer-events: none;
    z-index: 2;
    opacity: 0.055;
    mix-blend-mode: multiply;
    will-change: transform;
}
.noise-overlay svg {
    width: 110%;
    height: 110%;
    display: block;
}

/* -------- Masthead -------- */

.masthead {
    position: fixed;
    top: 2rem;
    left: 2.25rem;
    z-index: 20;
    mix-blend-mode: multiply;
}

.wordmark {
    display: inline-flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--c-walnut);
    letter-spacing: 0.42em;
    font-weight: 500;
    font-size: 0.92rem;
    line-height: 1;
    transition: color 0.3s var(--ease-vellum);
}
.wordmark:hover { color: var(--c-amber); }
.wordmark-letters {
    display: inline-block;
}
.wordmark-rule {
    display: block;
    width: 4.25rem;
    height: 1px;
    background: var(--c-ink-faded);
    margin-top: 0.55rem;
    opacity: 0.7;
}
.wordmark-sub {
    font-family: var(--f-serif);
    font-style: italic;
    font-weight: 400;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    color: var(--c-ink-faded);
    margin-top: 0.45rem;
    text-transform: none;
}

/* -------- Rail nav (right edge, vertical) -------- */

.rail-nav {
    position: fixed;
    top: 50%;
    right: 1.6rem;
    transform: translateY(-50%);
    z-index: 20;
    mix-blend-mode: multiply;
}
.rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 1.35rem;
    align-items: flex-end;
}
.rail-list a {
    display: inline-flex;
    align-items: baseline;
    gap: 0.7rem;
    text-decoration: none;
    color: var(--c-ink-faded);
    font-family: var(--f-mono);
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    transition: color 0.3s var(--ease-vellum);
    padding: 0.1rem 0;
}
.rail-list a .rail-num {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 0.9rem;
    letter-spacing: 0;
    color: var(--c-amber);
    opacity: 0.7;
    transition: opacity 0.3s var(--ease-vellum);
}
.rail-list a .rail-label {
    position: relative;
    padding-right: 0.1rem;
}
.rail-list a .rail-label::after {
    content: "";
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--c-blue);
    transition: width 0.3s var(--ease-vellum);
}
.rail-list a:hover { color: var(--c-walnut); }
.rail-list a:hover .rail-num { opacity: 1; }
.rail-list a:hover .rail-label::after { width: 100%; }
.rail-list a.is-active {
    color: var(--c-walnut);
}
.rail-list a.is-active .rail-num { opacity: 1; color: var(--c-amber); }
.rail-list a.is-active .rail-label::after { width: 100%; background: var(--c-amber); }

/* -------- Manuscript (main) -------- */

.manuscript {
    position: relative;
    z-index: 5;
}

.scene {
    position: relative;
    min-height: 100vh;
    padding: 8rem 6.5rem 6rem;
    display: flex;
}

/* =========================================================
   OPENING SCENE
   ========================================================= */

.scene--opening {
    flex-direction: column;
    justify-content: center;
    padding-top: 10rem;
    padding-bottom: 8rem;
    overflow: hidden;
}

/* Grid-line cluster behind hero */
.grid-cluster {
    position: absolute;
    top: 14%;
    left: 4%;
    width: 42%;
    height: 70%;
    background-image:
        repeating-linear-gradient(to right, rgba(107, 94, 80, 0.14) 0, rgba(107, 94, 80, 0.14) 1px, transparent 1px, transparent 8px),
        repeating-linear-gradient(to bottom, rgba(107, 94, 80, 0.1) 0, rgba(107, 94, 80, 0.1) 1px, transparent 1px, transparent 8px);
    transform: rotate(-1.5deg);
    opacity: 0.7;
    pointer-events: none;
    mask-image: radial-gradient(ellipse at 40% 40%, black 0%, black 55%, transparent 90%);
    -webkit-mask-image: radial-gradient(ellipse at 40% 40%, black 0%, black 55%, transparent 90%);
}

.opening-stamp {
    position: absolute;
    top: 4.5rem;
    right: 7rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    align-items: flex-end;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    opacity: 0.85;
}
.opening-stamp .stamp-line:first-child {
    color: var(--c-amber);
    font-weight: 500;
}

.opening-body {
    position: relative;
    margin-left: 55%;
    max-width: 40rem;
    transform: translateX(-12%);
    z-index: 3;
}

.opening-eyebrow {
    font-family: var(--f-mono);
    font-size: 0.76rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--c-blue);
    margin: 0 0 2.2rem;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
    opacity: 0;
    transform: translateY(8px);
    animation: fadeRise 1s var(--ease-vellum) 0.2s forwards;
}
.eyebrow-mark {
    width: 2.6rem;
    height: 1px;
    background: var(--c-blue);
    display: inline-block;
    opacity: 0.8;
}

.opening-heading {
    font-family: var(--f-sans);
    font-weight: 300;
    font-size: clamp(2.8rem, 6.2vw, 5.4rem);
    line-height: 1.08;
    letter-spacing: -0.012em;
    color: var(--c-walnut);
    margin: 0;
}
.opening-heading em {
    font-family: var(--f-serif);
    font-style: italic;
    font-weight: 400;
    color: var(--c-amber);
    letter-spacing: 0;
}

.heading-line {
    display: block;
    opacity: 0;
    transform: translateY(18px);
    filter: blur(4px);
    animation: fadeRise 1.2s var(--ease-vellum) forwards;
}
.heading-line:nth-child(1) { animation-delay: 0.55s; }
.heading-line:nth-child(2) { animation-delay: 0.9s; }
.heading-line:nth-child(3) { animation-delay: 1.25s; }
.heading-line--drift { padding-left: 3.5rem; }
.heading-line--quiet {
    color: var(--c-ink-faded);
    padding-left: 0.8rem;
    font-weight: 300;
}

.opening-colophon {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 1.08rem;
    color: var(--c-ink-faded);
    line-height: 1.6;
    max-width: 28rem;
    margin: 3rem 0 0 5rem;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeRise 1s var(--ease-vellum) 1.9s forwards;
    position: relative;
}
.opening-colophon::before {
    content: "";
    position: absolute;
    top: 0.85rem;
    left: -3.5rem;
    width: 2.6rem;
    height: 1px;
    background: var(--c-straw);
}

.opening-aside {
    position: absolute;
    top: 38%;
    left: 7rem;
    width: 16rem;
    z-index: 3;
    opacity: 0;
    transform: translateY(12px);
    animation: fadeRise 1s var(--ease-vellum) 1.6s forwards;
}
.opening-aside .vine {
    width: 3.5rem;
    height: 5.2rem;
    display: block;
    margin-bottom: 1.2rem;
    opacity: 0.75;
}
.aside-note {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 0.98rem;
    color: var(--c-blue);
    line-height: 1.55;
    margin: 0 0 1rem;
}
.aside-meta {
    font-family: var(--f-mono);
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    opacity: 0.7;
    margin: 0;
    line-height: 1.6;
}

.em-dash {
    color: var(--c-amber);
    font-style: normal;
    margin-right: 0.25rem;
}

.opening-foot {
    position: absolute;
    bottom: 3.2rem;
    left: 50%;
    transform: translateX(-50%);
    display: inline-flex;
    align-items: center;
    gap: 0.9rem;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    opacity: 0;
    animation: fadeRise 1s var(--ease-vellum) 2.4s forwards, driftDown 2.6s var(--ease-vellum) 3.4s infinite;
}
.foot-mark {
    width: 1px;
    height: 2.2rem;
    background: var(--c-ink-faded);
    display: inline-block;
    opacity: 0.5;
}

@keyframes fadeRise {
    to { opacity: 1; transform: translateY(0); filter: blur(0); }
}
@keyframes driftDown {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, 6px); }
}

/* =========================================================
   LETTER SCENES (Letter 1 & 2)
   ========================================================= */

.scene--letter {
    flex-direction: column;
    padding-top: 11rem;
    padding-bottom: 9rem;
}

.letter-header {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-left: 4rem;
    margin-bottom: 3.2rem;
    max-width: 40rem;
}
.letter-header--right {
    margin-left: auto;
    margin-right: 4rem;
    align-items: flex-end;
    text-align: right;
}
.letter-salutation {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 1.45rem;
    color: var(--c-amber);
    letter-spacing: 0.01em;
}
.letter-dateline {
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
}

.letter-body {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 62%) minmax(0, 38%);
    gap: 3.5rem;
    margin-left: 4rem;
    margin-right: 2rem;
    align-items: start;
}
.letter-body--reversed {
    grid-template-columns: minmax(0, 38%) minmax(0, 62%);
    margin-left: 2rem;
    margin-right: 4rem;
}
.scene--letter-right .letter-body--reversed {
    margin-right: 0;
}

.letter-column {
    max-width: 38rem;
}
.letter-paragraph {
    font-size: 1.12rem;
    line-height: 1.78;
    color: var(--c-walnut);
    margin: 0 0 1.8rem;
    font-weight: 400;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.9s var(--ease-vellum), transform 0.9s var(--ease-vellum);
}
.letter-paragraph::first-line {
    font-variant: small-caps;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--c-shadow);
}
.is-in-view .letter-paragraph {
    opacity: 1;
    transform: translateY(0);
}
.is-in-view .letter-paragraph:nth-child(1) { transition-delay: 0.05s; }
.is-in-view .letter-paragraph:nth-child(2) { transition-delay: 0.2s; }
.is-in-view .letter-paragraph:nth-child(3) { transition-delay: 0.35s; }

.drop-cap {
    font-family: var(--f-serif);
    font-style: italic;
    font-weight: 500;
    font-size: 3.6rem;
    line-height: 0.9;
    color: var(--c-amber);
    float: left;
    margin: 0.35rem 0.5rem 0 0;
    padding-top: 0.1rem;
    position: relative;
}
.drop-cap-vine {
    display: inline-block;
    position: absolute;
    left: 1.6rem;
    top: -1.8rem;
    width: 1.2rem;
    height: 4rem;
    opacity: 0.55;
    pointer-events: none;
}
.drop-cap-vine svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* Marginalia */

.marginalia {
    position: relative;
    padding: 0.5rem 0 0.5rem 1.6rem;
    border-left: 1px dashed rgba(212, 201, 184, 0.9);
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.9s var(--ease-vellum) 0.2s, transform 0.9s var(--ease-vellum) 0.2s;
}
.marginalia--left {
    border-left: none;
    border-right: 1px dashed rgba(212, 201, 184, 0.9);
    padding: 0.5rem 1.6rem 0.5rem 0;
    text-align: right;
}
.is-in-view .marginalia {
    opacity: 1;
    transform: translateY(0);
}

.margin-note {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 0.98rem;
    line-height: 1.55;
    color: var(--c-blue);
    margin: 0 0 1.3rem;
}
.marginalia--left .em-dash { margin-left: 0.25rem; margin-right: 0; }

.pull-quote {
    margin: 1.8rem 0 1.6rem;
    padding: 0.6rem 0;
    border-top: 1px solid rgba(196, 144, 61, 0.4);
    border-bottom: 1px solid rgba(196, 144, 61, 0.4);
    font-family: var(--f-serif);
    font-style: italic;
    font-weight: 400;
    font-size: 1.15rem;
    line-height: 1.5;
    color: var(--c-walnut);
    position: relative;
}
.pull-quote cite {
    display: block;
    margin-top: 0.6rem;
    font-size: 0.78rem;
    font-family: var(--f-mono);
    font-style: normal;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    opacity: 0.85;
}
.pull-open, .pull-close {
    color: var(--c-amber);
    font-size: 1.6rem;
    line-height: 0;
    position: relative;
    top: 0.3rem;
}
.pull-quote--alt {
    border-top-color: rgba(61, 106, 140, 0.4);
    border-bottom-color: rgba(61, 106, 140, 0.4);
}
.pull-quote--alt .pull-open,
.pull-quote--alt .pull-close { color: var(--c-blue); }

/* Page-corner triangle, top-right of a letter article */
.page-corner {
    position: absolute;
    top: -0.5rem;
    right: -0.5rem;
    width: 2.4rem;
    height: 2.4rem;
    background:
        linear-gradient(225deg, var(--c-linen) 50%, transparent 50%);
    filter: drop-shadow(-2px 2px 3px rgba(30, 26, 21, 0.12));
    pointer-events: none;
    opacity: 0.8;
}

/* =========================================================
   INTERLUDE
   ========================================================= */

.scene--interlude {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 8rem;
    padding-bottom: 8rem;
    background:
        radial-gradient(ellipse at 50% 50%, rgba(236, 229, 213, 0.55) 0%, transparent 65%);
}
.scene--interlude::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' seed='9' stitchTiles='stitch'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.6'/></svg>");
    opacity: 0.08;
    mix-blend-mode: multiply;
    pointer-events: none;
}

.interlude-rule {
    width: 68%;
    height: 1px;
    background-image: linear-gradient(to right, transparent, rgba(107, 94, 80, 0.5) 20%, rgba(107, 94, 80, 0.5) 80%, transparent);
    margin: 2rem auto;
    opacity: 0;
    transform: scaleX(0.4);
    transform-origin: center;
    transition: opacity 0.9s var(--ease-vellum), transform 1.1s var(--ease-vellum);
}
.interlude-rule--lower {
    background-image: linear-gradient(to right, transparent, rgba(196, 144, 61, 0.5) 20%, rgba(196, 144, 61, 0.5) 80%, transparent);
}
.is-in-view .interlude-rule {
    opacity: 1;
    transform: scaleX(1);
}
.is-in-view .interlude-rule--lower { transition-delay: 0.3s; }

.interlude-figure {
    max-width: 58rem;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    position: relative;
    z-index: 2;
}

.interlude-quote {
    font-family: var(--f-serif);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(1.4rem, 2.6vw, 2.3rem);
    line-height: 1.45;
    color: var(--c-amber);
    margin: 0;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 1.1s var(--ease-vellum) 0.15s, transform 1.1s var(--ease-vellum) 0.15s;
}
.interlude-quote p { margin: 0; }
.is-in-view .interlude-quote { opacity: 1; transform: translateY(0); }

.interlude-attrib {
    margin-top: 1.4rem;
    font-family: var(--f-mono);
    font-size: 0.76rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.9s var(--ease-vellum) 0.45s, transform 0.9s var(--ease-vellum) 0.45s;
}
.is-in-view .interlude-attrib { opacity: 1; transform: translateY(0); }

/* =========================================================
   LEDGER (skeleton loader items)
   ========================================================= */

.scene--ledger {
    flex-direction: column;
    padding-top: 10rem;
}

.ledger-header {
    margin-left: 6rem;
    max-width: 42rem;
    margin-bottom: 3.5rem;
}
.ledger-eyebrow {
    font-family: var(--f-mono);
    font-size: 0.76rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--c-blue);
    display: block;
    margin-bottom: 0.9rem;
}
.ledger-title {
    font-family: var(--f-sans);
    font-weight: 500;
    font-size: clamp(1.8rem, 3.2vw, 2.6rem);
    line-height: 1.2;
    color: var(--c-walnut);
    margin: 0;
    letter-spacing: -0.008em;
}
.ledger-title-accent {
    font-family: var(--f-serif);
    font-style: italic;
    font-weight: 400;
    color: var(--c-amber);
}

.ledger-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0;
    counter-reset: ledger;
    margin-left: 6rem;
    max-width: 58rem;
}

.ledger-item {
    position: relative;
    padding: 1.6rem 0 1.8rem 4.5rem;
    border-bottom: 1px dashed rgba(212, 201, 184, 0.9);
    counter-increment: ledger;
    transition: background 0.3s var(--ease-vellum);
}
.ledger-item:first-child { border-top: 1px dashed rgba(212, 201, 184, 0.9); }

.ledger-item::before {
    content: counter(ledger, decimal-leading-zero);
    position: absolute;
    left: 0;
    top: 1.85rem;
    font-family: var(--f-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    color: var(--c-amber);
    opacity: 0.8;
}

.ledger-item:hover { background: rgba(236, 229, 213, 0.35); }

.ledger-item .ledger-date {
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    display: block;
    margin-bottom: 0.5rem;
}
.ledger-item .ledger-entry-title {
    font-family: var(--f-sans);
    font-weight: 500;
    font-size: 1.32rem;
    color: var(--c-walnut);
    margin: 0 0 0.5rem;
    line-height: 1.25;
    position: relative;
    display: inline-block;
}
.ledger-item .ledger-entry-title::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 1px;
    background: var(--c-blue);
    transition: width 0.35s var(--ease-vellum);
}
.ledger-item:hover .ledger-entry-title::after { width: 100%; }
.ledger-item .ledger-excerpt {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 1.02rem;
    color: var(--c-ink-faded);
    margin: 0;
    line-height: 1.55;
    max-width: 46rem;
}

/* Skeleton placeholder state */
.skeleton-line {
    display: block;
    height: 0.85rem;
    border-radius: 2px;
    background: linear-gradient(
        90deg,
        var(--c-straw) 0%,
        var(--c-linen) 40%,
        var(--c-straw) 80%
    );
    background-size: 240% 100%;
    animation: skelShimmer 1.8s ease-in-out infinite;
    margin-bottom: 0.8rem;
    opacity: 0.55;
}
.skeleton-line--sm { width: 28%; height: 0.6rem; }
.skeleton-line--lg { width: 72%; height: 1.4rem; margin-top: 0.2rem; }
.skeleton-line--md { width: 88%; height: 0.7rem; }
.ledger-item.is-loaded .skeleton-line { display: none; }

@keyframes skelShimmer {
    0% { background-position: 120% 0; opacity: 0.42; }
    50% { opacity: 0.7; }
    100% { background-position: -20% 0; opacity: 0.42; }
}

.ledger-aside {
    margin-left: 6rem;
    margin-top: 2.8rem;
    max-width: 40rem;
}

/* =========================================================
   ENVOI
   ========================================================= */

.scene--envoi {
    flex-direction: column;
    justify-content: center;
    padding-top: 9rem;
    padding-bottom: 5rem;
}
.envoi-inner {
    max-width: 36rem;
    margin-left: 22%;
    position: relative;
}
.envoi-inner::before {
    content: "";
    position: absolute;
    top: -1rem;
    left: -4rem;
    width: 3rem;
    height: 1px;
    background: var(--c-amber);
    opacity: 0.7;
}
.envoi-eyebrow {
    font-family: var(--f-mono);
    font-size: 0.76rem;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--c-blue);
    margin: 0 0 1.6rem;
}
.envoi-dash { color: var(--c-amber); }
.envoi-body {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: clamp(1.3rem, 2.3vw, 1.85rem);
    line-height: 1.5;
    color: var(--c-walnut);
    margin: 0 0 2.4rem;
}
.envoi-signature {
    margin: 0 0 3rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.signature-line {
    font-family: var(--f-sans);
    font-weight: 400;
    font-size: 1rem;
    color: var(--c-ink-faded);
    letter-spacing: 0.02em;
}
.signature-mark {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 1.9rem;
    color: var(--c-amber);
    letter-spacing: 0.04em;
}

.envoi-form {
    border-top: 1px solid rgba(212, 201, 184, 0.9);
    padding-top: 1.6rem;
    margin-top: 1rem;
}
.envoi-label {
    display: block;
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    margin-bottom: 0.8rem;
}
.envoi-input-row {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    border-bottom: 1px solid var(--c-ink-faded);
    padding-bottom: 0.3rem;
}
.envoi-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 1.25rem;
    color: var(--c-walnut);
    padding: 0.5rem 0;
    caret-color: var(--c-amber);
}
.envoi-input::placeholder {
    color: rgba(107, 94, 80, 0.5);
    font-style: italic;
}
.envoi-submit {
    background: transparent;
    border: 1px solid var(--c-walnut);
    color: var(--c-walnut);
    font-family: var(--f-mono);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    padding: 0.6rem 1.3rem;
    cursor: pointer;
    transition: background 0.3s var(--ease-vellum), color 0.3s var(--ease-vellum), border-color 0.3s var(--ease-vellum);
}
.envoi-submit:hover {
    background: var(--c-amber);
    color: var(--c-parchment);
    border-color: var(--c-amber);
}
.envoi-hint {
    font-family: var(--f-serif);
    font-style: italic;
    font-size: 0.92rem;
    color: var(--c-ink-faded);
    margin: 0.8rem 0 0;
    min-height: 1.4rem;
    transition: color 0.3s var(--ease-vellum);
}
.envoi-hint.is-success { color: var(--c-blue); }
.envoi-hint.is-error { color: var(--c-rose); }

.colophon {
    margin-top: 5rem;
    padding-top: 1.4rem;
    border-top: 1px dashed rgba(212, 201, 184, 0.9);
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem 0.9rem;
    font-family: var(--f-mono);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-ink-faded);
    opacity: 0.85;
    margin-left: 22%;
    max-width: 36rem;
}
.colophon-sep { opacity: 0.55; }

/* =========================================================
   Anchor links: underline draw on hover
   ========================================================= */

a { color: var(--c-blue); text-decoration: none; }
.letter-column a,
.interlude-figure a,
.envoi-inner a {
    position: relative;
    color: var(--c-blue);
}
.letter-column a::after,
.interlude-figure a::after,
.envoi-inner a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 1px;
    background: var(--c-blue);
    transition: width 0.3s var(--ease-vellum);
}
.letter-column a:hover::after,
.interlude-figure a:hover::after,
.envoi-inner a:hover::after { width: 100%; }

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

@media (max-width: 1100px) {
    .scene { padding: 7rem 3rem 5rem; }
    .opening-body { margin-left: 40%; transform: translateX(0); }
    .opening-aside { left: 3rem; top: 32%; width: 13rem; }
    .opening-stamp { right: 3rem; }
    .letter-body,
    .letter-body--reversed {
        grid-template-columns: 1fr;
        margin: 0 2rem;
        gap: 2.5rem;
    }
    .marginalia {
        border-left: 1px dashed rgba(212, 201, 184, 0.9);
        padding-left: 1.4rem;
        padding-right: 0;
        text-align: left;
    }
    .marginalia--left {
        border-right: none;
        border-left: 1px dashed rgba(212, 201, 184, 0.9);
        padding-left: 1.4rem;
        padding-right: 0;
        text-align: left;
    }
    .letter-header, .letter-header--right {
        margin-left: 2rem;
        margin-right: 2rem;
        text-align: left;
        align-items: flex-start;
    }
    .ledger-header, .ledger-list, .ledger-aside { margin-left: 2rem; }
    .envoi-inner, .colophon { margin-left: 2rem; }
    .rail-nav { right: 0.7rem; }
    .rail-list a .rail-label { display: none; }
}

@media (max-width: 720px) {
    .masthead { top: 1.2rem; left: 1.2rem; }
    .wordmark { font-size: 0.82rem; letter-spacing: 0.35em; }
    .wordmark-sub { font-size: 0.72rem; }
    .scene { padding: 6.5rem 1.4rem 4rem; }
    .opening-body { margin-left: 0; }
    .opening-stamp { top: 3rem; right: 1.2rem; }
    .opening-aside { position: static; margin-top: 2.4rem; width: auto; }
    .heading-line--drift { padding-left: 1rem; }
    .opening-colophon { margin-left: 0; }
    .opening-colophon::before { display: none; }
    .opening-foot { display: none; }
    .rail-nav {
        top: auto;
        bottom: 0.8rem;
        right: 50%;
        transform: translateX(50%);
        background: rgba(245, 240, 232, 0.85);
        border: 1px solid rgba(212, 201, 184, 0.6);
        padding: 0.5rem 0.9rem;
        border-radius: 2px;
    }
    .rail-list {
        flex-direction: row;
        gap: 0.9rem;
    }
    .rail-list a .rail-label { display: none; }
    .letter-header, .letter-header--right,
    .ledger-header, .ledger-list, .ledger-aside,
    .envoi-inner, .colophon {
        margin-left: 1rem;
        margin-right: 1rem;
    }
    .ledger-item { padding-left: 3rem; }
    .colophon { margin-right: 1rem; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}