/* a6c.boo - A Haunted Letterpress */

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

:root {
    --phantom-ink: #1a1520;
    --vellum-gray: #d4cfc6;
    --gaslight-gold: #c4953a;
    --gaslight-dim: #b8883a;
    --spectre-violet: #6b4c8a;
    --foxing-brown: #8a7056;
    --apparition-white: #f0ece4;
    --spine-width: 3px;
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-paper: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

html, body {
    background: var(--phantom-ink);
    color: var(--apparition-white);
    font-family: 'Lora', Georgia, serif;
    font-size: 18px;
    line-height: 1.7;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

body {
    background:
        radial-gradient(ellipse at 30% 0%, rgba(107, 76, 138, 0.08), transparent 60%),
        radial-gradient(ellipse at 70% 100%, rgba(196, 149, 58, 0.06), transparent 55%),
        var(--phantom-ink);
    min-height: 100vh;
    position: relative;
}

/* ====================================
   PAPER GRAIN OVERLAY
==================================== */
.paper-grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: 0.18;
    background-image:
        radial-gradient(circle at 17% 23%, rgba(212, 207, 198, 0.12) 0.5px, transparent 1px),
        radial-gradient(circle at 67% 53%, rgba(212, 207, 198, 0.08) 0.5px, transparent 1px),
        radial-gradient(circle at 33% 77%, rgba(138, 112, 86, 0.08) 0.5px, transparent 1px),
        radial-gradient(circle at 89% 11%, rgba(212, 207, 198, 0.10) 0.4px, transparent 1px),
        radial-gradient(circle at 11% 91%, rgba(138, 112, 86, 0.07) 0.4px, transparent 1px);
    background-size: 220px 220px, 180px 180px, 240px 240px, 160px 160px, 200px 200px;
    mix-blend-mode: screen;
}

/* ====================================
   SPINE NAVIGATION
==================================== */
.spine {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    height: 80vh;
    z-index: 100;
    pointer-events: none;
}

.spine-bar {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: var(--spine-width);
    height: 100%;
    background: linear-gradient(to bottom,
        transparent 0%,
        var(--gaslight-gold) 8%,
        var(--gaslight-dim) 50%,
        var(--gaslight-gold) 92%,
        transparent 100%);
    box-shadow:
        0 0 8px rgba(196, 149, 58, 0.45),
        0 0 18px rgba(196, 149, 58, 0.18);
    pointer-events: auto;
    cursor: pointer;
    animation: flicker 4.2s ease-in-out infinite;
}

.spine-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(180deg);
    writing-mode: vertical-rl;
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.78rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--gaslight-gold);
    background: var(--phantom-ink);
    padding: 14px 5px;
    border: 1px solid rgba(196, 149, 58, 0.35);
    white-space: nowrap;
    pointer-events: auto;
    cursor: pointer;
    transition: color 0.4s var(--ease-paper), border-color 0.4s var(--ease-paper);
}

.spine-label:hover {
    color: var(--apparition-white);
    border-color: var(--gaslight-gold);
}

.spine-label::after {
    content: attr(data-ghost);
    position: absolute;
    inset: 14px 5px;
    color: var(--spectre-violet);
    opacity: 0.35;
    filter: blur(0.5px);
    transform: translate(2px, -2px);
    transition: transform 0.4s var(--ease-spring), opacity 0.4s ease;
    pointer-events: none;
}

.spine-label:hover::after {
    transform: translate(5px, -5px);
    opacity: 0.55;
}

.spine-flyout {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scaleX(0);
    transform-origin: center center;
    width: min(280px, 70vw);
    max-height: 70vh;
    overflow-y: auto;
    background: linear-gradient(180deg, #221b29 0%, #1a1520 100%);
    border: 1px solid rgba(196, 149, 58, 0.45);
    box-shadow:
        0 24px 60px rgba(0, 0, 0, 0.7),
        0 0 0 1px rgba(212, 207, 198, 0.04) inset;
    padding: 28px 24px;
    pointer-events: none;
    opacity: 0;
    transition:
        transform 320ms var(--ease-spring),
        opacity 220ms ease;
}

.spine.open .spine-flyout {
    transform: translate(-50%, -50%) scaleX(1);
    pointer-events: auto;
    opacity: 1;
}

.spine.open .spine-label {
    opacity: 0;
    pointer-events: none;
}

.flyout-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--gaslight-gold);
    text-align: center;
    margin-bottom: 18px;
    letter-spacing: 0.04em;
}

.flyout-list {
    list-style: none;
    border-top: 1px solid rgba(138, 112, 86, 0.4);
    border-bottom: 1px solid rgba(138, 112, 86, 0.4);
    padding: 10px 0;
    margin-bottom: 14px;
}

.flyout-list li {
    margin: 2px 0;
}

.flyout-list a {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    padding: 6px 4px;
    color: var(--apparition-white);
    text-decoration: none;
    font-family: 'Lora', Georgia, serif;
    font-size: 0.95rem;
    border-bottom: 1px dotted rgba(138, 112, 86, 0.25);
    transition: color 0.3s ease, padding-left 0.3s var(--ease-paper);
}

.flyout-list a:last-child { border-bottom: none; }

.flyout-list a:hover {
    color: var(--gaslight-gold);
    padding-left: 8px;
}

.toc-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.toc-page {
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.78rem;
    color: var(--foxing-brown);
    letter-spacing: 0.05em;
}

.flyout-note {
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.7rem;
    text-align: center;
    color: var(--foxing-brown);
    letter-spacing: 0.08em;
    font-style: italic;
}

/* ====================================
   BOOK / SPREADS
==================================== */
.book {
    position: relative;
    z-index: 2;
    scroll-snap-type: y mandatory;
    overflow-y: auto;
    height: 100vh;
}

.spread {
    position: relative;
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spine-width);
    padding: 6vh 5vw;
    scroll-snap-align: start;
    border-bottom: 1px solid rgba(138, 112, 86, 0.18);
    overflow: hidden;
}

.spread::before {
    content: "";
    position: absolute;
    top: 6vh;
    bottom: 6vh;
    left: 50%;
    width: 1px;
    background: linear-gradient(to bottom,
        transparent,
        rgba(138, 112, 86, 0.25) 12%,
        rgba(138, 112, 86, 0.25) 88%,
        transparent);
    transform: translateX(-50%);
    pointer-events: none;
}

/* Folio corners */
.folio-corner {
    position: absolute;
    width: 56px;
    height: 56px;
    fill: none;
    stroke: var(--gaslight-gold);
    stroke-width: 1.4;
    stroke-linecap: square;
    pointer-events: none;
}

.folio-corner path {
    stroke-dasharray: 60;
    stroke-dashoffset: 60;
    transition: stroke-dashoffset 600ms var(--ease-paper);
}

.spread.in-view .folio-corner path {
    stroke-dashoffset: 0;
    animation: corner-settle 800ms var(--ease-spring) 600ms both;
}

.folio-tl {
    top: 22px;
    left: 22px;
}

.folio-br {
    bottom: 22px;
    right: 22px;
}

@keyframes corner-settle {
    0% { transform: scale(1); }
    50% { transform: scale(1.04); }
    100% { transform: scale(1); }
}

/* Pages */
.page {
    position: relative;
    padding: 4vh 4vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 0;
}

.page-left {
    align-items: center;
    border-right: 0;
}

.page-right {
    align-items: flex-start;
}

/* ====================================
   LETTERFORM SPECIMENS
==================================== */
.specimen-wrap {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 24px;
}

.specimen {
    position: relative;
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 900;
    font-size: clamp(8rem, 22vw, 22rem);
    line-height: 0.9;
    user-select: none;
    perspective: 1200px;
    width: clamp(180px, 26vw, 400px);
    height: clamp(180px, 26vw, 400px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.specimen-blackletter {
    transform-style: preserve-3d;
    animation: spin-y 24s linear infinite;
}

@keyframes spin-y {
    0% { transform: rotateY(-6deg); }
    50% { transform: rotateY(6deg); }
    100% { transform: rotateY(-6deg); }
}

.specimen .spec-base,
.specimen .spec-paper,
.specimen .spec-ghost {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    line-height: 1;
}

.specimen .spec-base {
    color: var(--phantom-ink);
    text-shadow:
        0 0 1px rgba(212, 207, 198, 0.5),
        2px 2px 0 rgba(26, 21, 32, 0.9);
    z-index: 2;
}

.specimen .spec-paper {
    color: transparent;
    background:
        radial-gradient(ellipse at 30% 30%, rgba(212, 207, 198, 0.95), rgba(212, 207, 198, 0.6) 50%, rgba(138, 112, 86, 0.4) 100%),
        var(--vellum-gray);
    -webkit-background-clip: text;
    background-clip: text;
    z-index: 3;
    filter: drop-shadow(2px 3px 0 rgba(26, 21, 32, 0.6));
}

.specimen .spec-ghost {
    color: var(--spectre-violet);
    opacity: 0.32;
    filter: blur(0.6px);
    transform: translate(calc(-50% + 4px), calc(-50% - 3px));
    z-index: 1;
    transition: transform 600ms var(--ease-spring), opacity 400ms ease;
}

.specimen:hover .spec-ghost,
.specimen:focus-within .spec-ghost {
    transform: translate(calc(-50% + 9px), calc(-50% - 8px));
    opacity: 0.55;
}

.specimen.snap .spec-ghost {
    transform: translate(-50%, -50%) !important;
    opacity: 0.62 !important;
    transition: transform 180ms ease-out, opacity 180ms ease-out;
}

.specimen-caption {
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.82rem;
    color: var(--foxing-brown);
    letter-spacing: 0.08em;
    text-align: center;
    max-width: 28ch;
    line-height: 1.5;
}

/* Card-flip specimens */
.card-flip {
    cursor: pointer;
    outline: none;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 800ms var(--ease-spring);
}

.card-flip.flipped .card-inner {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-back {
    transform: rotateY(180deg);
    flex-direction: column;
    gap: 14px;
    text-align: center;
    padding: 18px;
    background: linear-gradient(160deg, #211b29 0%, #15101a 100%);
    border: 1px solid rgba(196, 149, 58, 0.35);
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.78rem;
    line-height: 1.55;
    color: var(--apparition-white);
}

.back-codepoint {
    font-size: 0.75rem;
    color: var(--gaslight-gold);
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.back-nato {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: 1.6rem;
    color: var(--apparition-white);
    letter-spacing: 0.04em;
}

.back-bio {
    color: var(--vellum-gray);
    font-style: italic;
    max-width: 26ch;
    margin: 0 auto;
    line-height: 1.6;
}

/* ====================================
   PAGE-RIGHT TYPOGRAPHY
==================================== */
.kicker {
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.78rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--gaslight-gold);
    margin-bottom: 14px;
    animation: flicker 4.6s ease-in-out infinite;
}

.title-row {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 900;
    font-size: clamp(3.4rem, 8vw, 7rem);
    line-height: 0.95;
    color: var(--apparition-white);
    letter-spacing: -0.01em;
    margin-bottom: 26px;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
}

.echo-letter {
    position: relative;
    display: inline-block;
    opacity: 0;
    transform: translateY(8px);
    animation: typewrite 600ms var(--ease-paper) forwards;
    animation-delay: calc(var(--i, 0) * 90ms + 200ms);
}

.echo-letter:nth-child(1) { --i: 0; }
.echo-letter:nth-child(2) { --i: 1; }
.echo-letter:nth-child(3) { --i: 2; }
.echo-letter:nth-child(4) { --i: 3; }
.echo-letter:nth-child(5) { --i: 4; }
.echo-letter:nth-child(6) { --i: 5; }
.echo-letter:nth-child(7) { --i: 6; }

.echo-letter::after {
    content: attr(data-char);
    position: absolute;
    top: 0;
    left: 0;
    color: var(--spectre-violet);
    opacity: 0.35;
    filter: blur(0.6px);
    transform: translate(2px, 3px);
    pointer-events: none;
    animation: ghost-drift 6s ease-in-out infinite;
}

.echo-letter.dot {
    color: var(--gaslight-gold);
}

@keyframes typewrite {
    0% { opacity: 0; transform: translateY(8px); }
    60% { opacity: 1; transform: translateY(-1px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes ghost-drift {
    0%, 100% { transform: translate(2px, 3px); opacity: 0.32; }
    50% { transform: translate(3px, 2px); opacity: 0.45; }
}

.lede {
    font-family: 'Lora', Georgia, serif;
    font-size: 1.15rem;
    line-height: 1.75;
    color: var(--vellum-gray);
    margin-bottom: 22px;
    max-width: 48ch;
    font-style: italic;
}

.chapter-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3.4rem);
    line-height: 1.1;
    color: var(--gaslight-gold);
    margin-bottom: 22px;
    letter-spacing: -0.005em;
    max-width: 18ch;
}

.body-text {
    font-family: 'Lora', Georgia, serif;
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--vellum-gray);
    margin-bottom: 18px;
    max-width: 52ch;
}

.emph {
    font-weight: 600;
    color: var(--apparition-white);
    font-style: italic;
}

.ink-link {
    color: var(--gaslight-gold);
    text-decoration: none;
    background-image: linear-gradient(var(--gaslight-gold), var(--gaslight-gold));
    background-size: 0% 2px;
    background-position: left bottom;
    background-repeat: no-repeat;
    transition: background-size 400ms var(--ease-paper), color 400ms ease;
    padding-bottom: 2px;
    position: relative;
}

.ink-link:hover {
    background-size: 100% 2px;
    color: var(--apparition-white);
}

.ink-link::after {
    content: attr(data-ghost);
    position: absolute;
    left: 0;
    top: 0;
    color: var(--spectre-violet);
    opacity: 0.3;
    filter: blur(0.5px);
    transform: translate(2px, -2px);
    pointer-events: none;
    transition: transform 400ms var(--ease-spring);
}

.ink-link:hover::after {
    transform: translate(5px, -5px);
}

.meta-line {
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--foxing-brown);
    letter-spacing: 0.12em;
    margin-top: 14px;
}

.meta-key {
    color: var(--gaslight-gold);
    text-transform: uppercase;
    letter-spacing: 0.18em;
}

/* ====================================
   INK-BLEED RULE
==================================== */
.rule-bleed {
    width: 100%;
    max-width: 360px;
    margin: 22px 0 18px;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 600ms ease 400ms, transform 600ms var(--ease-paper) 400ms;
}

.spread.in-view .rule-bleed {
    opacity: 1;
    transform: translateY(0);
}

.rule-bleed svg {
    width: 100%;
    height: 24px;
    overflow: visible;
}

.rule-bleed path {
    stroke: var(--foxing-brown);
    stroke-width: 1.2;
    fill: none;
    opacity: 0.55;
    filter: drop-shadow(0 0.5px 0 rgba(138, 112, 86, 0.3));
}

/* ====================================
   MARGINALIA
==================================== */
.marginalia {
    position: absolute;
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.82rem;
    color: var(--foxing-brown);
    letter-spacing: 0.04em;
    background: rgba(212, 207, 198, 0.04);
    padding: 4px 10px;
    border-left: 2px solid rgba(196, 149, 58, 0.4);
    overflow: hidden;
    white-space: nowrap;
    width: 0;
    max-width: 30ch;
    transition: width 1200ms steps(28, end);
    pointer-events: none;
}

.spread.in-view .marginalia {
    width: 30ch;
}

.margin-top-right {
    top: 12%;
    right: 4%;
    transform: rotate(3deg);
    transform-origin: right top;
}

.margin-top-left {
    top: 14%;
    left: 4%;
    transform: rotate(-2deg);
    transform-origin: left top;
}

.margin-mid-right {
    top: 50%;
    right: 4%;
    transform: rotate(2deg);
    transform-origin: right center;
}

.margin-mid-left {
    top: 52%;
    left: 4%;
    transform: rotate(-3deg);
    transform-origin: left center;
}

.margin-bottom-right {
    bottom: 14%;
    right: 4%;
    transform: rotate(-2deg);
    transform-origin: right bottom;
}

.margin-bottom-left {
    bottom: 12%;
    left: 4%;
    transform: rotate(3deg);
    transform-origin: left bottom;
}

.folio-num {
    position: absolute;
    bottom: 4vh;
    right: 4vw;
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--foxing-brown);
    letter-spacing: 0.18em;
}

/* ====================================
   COLOPHON
==================================== */
.spread.colophon {
    grid-template-columns: 1fr;
    background:
        radial-gradient(ellipse at center, rgba(196, 149, 58, 0.05), transparent 70%),
        linear-gradient(180deg, #1f1827 0%, #15101a 100%);
}

.spread.colophon::before {
    display: none;
}

.colophon-inner {
    margin: 0 auto;
    max-width: 560px;
    text-align: center;
    padding: 0 24px;
    color: var(--vellum-gray);
}

.colophon-mark {
    font-size: 2.4rem;
    color: var(--gaslight-gold);
    margin-bottom: 18px;
    animation: flicker 4s ease-in-out infinite;
}

.colophon-title {
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3rem);
    color: var(--apparition-white);
    margin-bottom: 28px;
    letter-spacing: 0.02em;
}

.colophon-line {
    font-family: 'Lora', Georgia, serif;
    font-size: 1rem;
    line-height: 1.85;
    color: var(--foxing-brown);
    margin-bottom: 14px;
}

.colophon-line em {
    color: var(--gaslight-gold);
    font-style: italic;
}

.roman {
    font-family: 'Playfair Display', Georgia, serif;
    color: var(--apparition-white);
    letter-spacing: 0.08em;
}

.colophon-rule {
    margin: 26px auto;
}

.colophon-sign {
    font-family: 'Special Elite', 'Courier New', monospace;
    font-size: 0.85rem;
    letter-spacing: 0.18em;
    color: var(--gaslight-gold);
    margin-top: 18px;
}

/* ====================================
   FLICKER (gaslight)
==================================== */
@keyframes flicker {
    0%   { opacity: 1;    filter: hue-rotate(0deg); }
    23%  { opacity: 0.94; filter: hue-rotate(-3deg); }
    48%  { opacity: 0.98; filter: hue-rotate(1deg); }
    71%  { opacity: 0.91; filter: hue-rotate(-2deg); }
    100% { opacity: 1;    filter: hue-rotate(0deg); }
}

/* ====================================
   RESPONSIVE
==================================== */
@media (max-width: 900px) {
    .spread {
        grid-template-columns: 1fr;
        padding: 4vh 6vw;
    }
    .spread::before { display: none; }
    .page-left { padding-bottom: 2vh; }
    .page-right { padding-top: 2vh; }
    .specimen { font-size: clamp(7rem, 32vw, 14rem); width: clamp(160px, 60vw, 320px); height: clamp(160px, 60vw, 320px); }
    .marginalia { display: none; }
    .spine { display: none; }
}

@media (max-width: 540px) {
    html { font-size: 16px; }
    .title-row { font-size: clamp(2.6rem, 14vw, 4rem); }
    .chapter-title { font-size: clamp(1.6rem, 7vw, 2.4rem); }
    .folio-corner { width: 40px; height: 40px; }
    .folio-tl { top: 14px; left: 14px; }
    .folio-br { bottom: 14px; right: 14px; }
}

/* ====================================
   REDUCED MOTION
==================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
    .echo-letter { opacity: 1; transform: none; }
}