/* =====================================================================
   tanso.biz — An Atlas of Carbon
   Watercolor treatise, monochrome palette, art-deco display typography.
   Palette: Sumi #1A1A1A, Kuro #2A2A2A, Nezumi #6B6B6B, Gin #A8A8A8,
            Hai #D4D4D4, Kami #EDEDED, Shiro #F5F5F3, Kin #B8960C
   ===================================================================== */

:root {
    --sumi: #1A1A1A;
    --kuro: #2A2A2A;
    --suzu: #3D3D3D;
    --nezumi: #6B6B6B;
    --gin: #A8A8A8;
    --hai: #D4D4D4;
    --kami: #EDEDED;
    --shiro: #F5F5F3;
    --kin: #B8960C;

    --font-display: "Poiret One", "Inter", serif;
    --font-label: "Josefin Sans", "Inter", sans-serif;
    --font-body: "Spectral", "Inter", "Times New Roman", serif;

    --grid-max: 1280px;
    --gutter: clamp(1.25rem, 3vw, 2.25rem);

    --ease-quill: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--shiro);
    color: var(--kuro);
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.72;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

.svg-defs {
    position: absolute;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* Paper grain overlay across whole page ------------------------------- */
.paper-grain {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 0.55;
    mix-blend-mode: multiply;
}

/* Floating monogram -------------------------------------------------- */
.monogram {
    position: fixed;
    top: clamp(1.25rem, 2.5vw, 2rem);
    left: clamp(1.25rem, 2.5vw, 2rem);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.7rem;
    color: var(--kin);
    text-decoration: none;
    border: 1px solid rgba(184, 150, 12, 0.55);
    border-radius: 2px;
    background: rgba(245, 245, 243, 0.55);
    backdrop-filter: blur(2px);
    z-index: 100;
    transition: transform 0.4s var(--ease-quill), background 0.4s var(--ease-quill);
}

.monogram::before,
.monogram::after {
    content: "";
    position: absolute;
    inset: 4px;
    border: 1px solid rgba(184, 150, 12, 0.25);
    pointer-events: none;
}

.monogram:hover {
    transform: scale(1.05);
    background: rgba(245, 245, 243, 0.9);
}

/* Index trigger ------------------------------------------------------ */
.index-trigger {
    position: fixed;
    top: clamp(1.4rem, 2.5vw, 2.05rem);
    right: clamp(1.25rem, 2.5vw, 2rem);
    background: transparent;
    border: 0;
    cursor: pointer;
    z-index: 100;
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    padding: 6px 4px;
    color: var(--kuro);
    font-family: var(--font-label);
    font-weight: 400;
    font-size: 0.78rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
}

.index-trigger-rule {
    display: inline-block;
    width: 36px;
    height: 1px;
    background: var(--kuro);
    transition: width 0.4s var(--ease-quill), background 0.4s var(--ease-quill);
}

.index-trigger:hover .index-trigger-rule {
    width: 56px;
    background: var(--kin);
}

/* Index Panel -------------------------------------------------------- */
.index-scrim {
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 26, 0.18);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s var(--ease-quill);
    z-index: 110;
}

.index-scrim.is-open {
    opacity: 1;
    pointer-events: auto;
}

.index-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: min(420px, 92vw);
    height: 100vh;
    background: var(--shiro);
    border-left: 1px solid rgba(42, 42, 42, 0.4);
    box-shadow: -20px 0 60px rgba(26, 26, 26, 0.08);
    transform: translateX(100%);
    transition: transform 0.6s var(--ease-quill);
    z-index: 120;
    overflow-y: auto;
}

.index-panel.is-open {
    transform: translateX(0);
}

.index-panel-inner {
    padding: clamp(2rem, 4vw, 3rem);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.index-header {
    position: relative;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(42, 42, 42, 0.4);
}

.index-eyebrow {
    display: block;
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--kin);
    margin-bottom: 0.5rem;
}

.index-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 2.4rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--sumi);
    line-height: 1.0;
}

.index-close {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 38px;
    height: 38px;
    border: 1px solid rgba(42, 42, 42, 0.4);
    background: transparent;
    color: var(--kuro);
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    transition: color 0.3s var(--ease-quill), border-color 0.3s var(--ease-quill);
}

.index-close:hover {
    color: var(--kin);
    border-color: var(--kin);
}

.index-list {
    list-style: none;
    flex: 1;
}

.index-list li {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 0;
    border-bottom: 1px dotted rgba(107, 107, 107, 0.45);
    cursor: pointer;
    transition: background 0.4s var(--ease-quill), padding 0.4s var(--ease-quill);
}

.index-list li:hover {
    background: rgba(212, 212, 212, 0.35);
    padding-left: 0.75rem;
}

.index-swatch {
    flex-shrink: 0;
    width: 38px;
    height: 30px;
    border-radius: 1px;
    border: 1px solid rgba(42, 42, 42, 0.3);
}

.index-roman {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--kin);
    letter-spacing: 0.1em;
    width: 32px;
    flex-shrink: 0;
}

.index-name {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--sumi);
    flex: 1;
}

.index-name em {
    color: var(--nezumi);
    font-style: italic;
    font-size: 0.85rem;
    display: block;
    margin-top: 2px;
    letter-spacing: 0.02em;
}

.index-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(42, 42, 42, 0.4);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-label);
    font-size: 0.7rem;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--nezumi);
}

/* Hero --------------------------------------------------------------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(6rem, 12vh, 9rem) clamp(1.5rem, 4vw, 4rem) clamp(4rem, 8vh, 6rem);
    overflow: hidden;
}

.hero-wash {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: 0;
    transition: opacity 1.2s var(--ease-quill);
}

.hero-wash.is-revealed {
    opacity: 1;
}

.hero-svg {
    width: 100%;
    height: 100%;
    display: block;
}

.hero-molecule {
    transform-origin: 600px 360px;
    animation: drift 22s ease-in-out infinite alternate;
}

.hero-blob {
    transform-origin: center;
    animation: drift 30s ease-in-out infinite alternate;
}

.hero-blob-2 {
    animation-duration: 36s;
    animation-direction: alternate-reverse;
}

@keyframes drift {
    0%   { transform: translate(0, 0) scale(1); }
    50%  { transform: translate(2.5%, -1.5%) scale(1.02); }
    100% { transform: translate(-1.8%, 1.8%) scale(0.99); }
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 1100px;
}

.hero-eyebrow {
    display: block;
    font-family: var(--font-label);
    font-weight: 300;
    font-size: clamp(0.72rem, 1vw, 0.85rem);
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--nezumi);
    margin-bottom: clamp(1.5rem, 3vh, 2.5rem);
    opacity: 0;
    animation: fadeIn 1.0s var(--ease-quill) 0.3s forwards;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 13vw, 11rem);
    font-weight: 400;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sumi);
    line-height: 1.0;
    display: flex;
    justify-content: center;
    gap: clamp(0.2rem, 1.5vw, 0.8rem);
    text-indent: 0.18em;
}

.t-letter {
    opacity: 0;
    transform: translateY(14px);
    display: inline-block;
}

.t-letter.is-revealed {
    animation: letterIn 0.9s var(--ease-quill) forwards;
}

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

.hero-subtitle {
    font-family: var(--font-label);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.4vw, 1.25rem);
    letter-spacing: 0.42em;
    text-transform: uppercase;
    color: var(--suzu);
    margin-top: clamp(1.5rem, 3vh, 2.25rem);
    overflow: hidden;
    display: inline-block;
    clip-path: inset(0 100% 0 0);
}

.hero-subtitle.is-revealed {
    animation: subtitleReveal 1.6s var(--ease-quill) 1.4s forwards;
}

@keyframes subtitleReveal {
    to { clip-path: inset(0 0 0 0); }
}

.hero-meta {
    margin-top: clamp(2rem, 4vh, 3.25rem);
    display: inline-flex;
    align-items: center;
    gap: clamp(0.75rem, 1.6vw, 1.4rem);
    font-family: var(--font-label);
    font-weight: 300;
    font-size: clamp(0.7rem, 0.9vw, 0.78rem);
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--nezumi);
    opacity: 0;
    animation: fadeIn 1.2s var(--ease-quill) 2.4s forwards;
}

.meta-dot {
    width: 4px;
    height: 4px;
    background: var(--kin);
    border-radius: 50%;
    transform: rotate(45deg);
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.hero-scroll-cue {
    position: absolute;
    bottom: clamp(1.5rem, 4vh, 2.5rem);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--nezumi);
    opacity: 0;
    animation: fadeIn 1.2s var(--ease-quill) 3.0s forwards;
    z-index: 2;
}

.scroll-arrow {
    width: 1px;
    height: 32px;
    background: var(--nezumi);
    position: relative;
    animation: scrollPulse 2.4s ease-in-out infinite;
}

.scroll-arrow::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: -3px;
    width: 7px;
    height: 7px;
    border-right: 1px solid var(--nezumi);
    border-bottom: 1px solid var(--nezumi);
    transform: rotate(45deg) translate(-2px, -2px);
}

@keyframes scrollPulse {
    0%, 100% { transform: translateY(0); opacity: 0.6; }
    50%      { transform: translateY(8px); opacity: 1; }
}

/* Diamond divider ---------------------------------------------------- */
.divider {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    max-width: var(--grid-max);
    margin: clamp(2.5rem, 6vh, 4rem) auto;
    padding: 0 clamp(1.5rem, 4vw, 4rem);
}

.rule {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, rgba(168, 168, 168, 0) 0%, var(--gin) 50%, rgba(168, 168, 168, 0) 100%);
}

.diamond {
    width: 10px;
    height: 10px;
    background: var(--kin);
    transform: rotate(45deg);
    flex-shrink: 0;
}

.diamond.small {
    width: 6px;
    height: 6px;
}

/* Plates section ----------------------------------------------------- */
.plates {
    position: relative;
    max-width: var(--grid-max);
    margin: 0 auto;
    padding: clamp(2rem, 5vh, 4rem) clamp(1.5rem, 4vw, 4rem);
    z-index: 2;
}

.plates-intro {
    text-align: center;
    max-width: 720px;
    margin: 0 auto clamp(3rem, 6vh, 5rem);
}

.plates-eyebrow {
    display: block;
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.78rem;
    letter-spacing: 0.36em;
    text-transform: uppercase;
    color: var(--kin);
    margin-bottom: 0.8rem;
}

.plates-heading {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sumi);
    line-height: 1.0;
    margin-bottom: 1.25rem;
}

.plates-lede {
    font-family: var(--font-body);
    font-size: clamp(0.95rem, 1.1vw, 1.05rem);
    line-height: 1.78;
    color: var(--kuro);
    font-style: italic;
}

/* Plate Grid --------------------------------------------------------- */
.plate-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: clamp(1.5rem, 3vw, 2.5rem);
    perspective: 1400px;
}

@media (max-width: 1024px) {
    .plate-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .plate-grid { grid-template-columns: 1fr; }
}

/* Plate Card --------------------------------------------------------- */
.plate {
    aspect-ratio: 4 / 5;
    position: relative;
    cursor: pointer;
    will-change: transform;
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.7s var(--ease-quill), transform 0.7s var(--ease-quill);
}

.plate.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.plate-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.7s var(--ease-quill), box-shadow 0.7s var(--ease-quill);
    box-shadow: 0 4px 12px rgba(26, 26, 26, 0.08);
}

.plate.is-flipped .plate-inner {
    transform: rotateY(180deg);
    box-shadow: 0 2px 8px rgba(26, 26, 26, 0.06);
}

.plate-inner.mid-flip {
    box-shadow: 0 8px 24px rgba(26, 26, 26, 0.15);
}

.plate-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background: radial-gradient(ellipse at 50% 35%, var(--kami) 0%, var(--hai) 100%);
    border: 1px solid rgba(42, 42, 42, 0.45);
    padding: clamp(1rem, 2vw, 1.6rem);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.plate-face::before {
    content: "";
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/><feColorMatrix values='0 0 0 0 0.16  0 0 0 0 0.16  0 0 0 0 0.16  0 0 0 0.05 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
    opacity: 0.5;
    mix-blend-mode: multiply;
    pointer-events: none;
}

.plate-recto {
    transform: rotateY(0deg);
}

.plate-verso {
    transform: rotateY(180deg);
    background: radial-gradient(ellipse at 50% 50%, var(--kami) 0%, var(--shiro) 65%, var(--hai) 100%);
}

/* Corner brackets */
.corner-bracket {
    position: absolute;
    width: 18px;
    height: 18px;
    border: 0 solid rgba(42, 42, 42, 0.32);
    transition: border-color 0.5s var(--ease-quill);
}

.corner-tl { top: 8px; left: 8px; border-top-width: 2px; border-left-width: 2px; }
.corner-tr { top: 8px; right: 8px; border-top-width: 2px; border-right-width: 2px; }
.corner-bl { bottom: 8px; left: 8px; border-bottom-width: 2px; border-left-width: 2px; }
.corner-br { bottom: 8px; right: 8px; border-bottom-width: 2px; border-right-width: 2px; }

.plate:hover .corner-bracket,
.plate.is-flipped .corner-bracket {
    border-color: var(--kin);
}

/* Plate number (roman) */
.plate-number {
    position: absolute;
    top: 18px;
    left: 26px;
    font-family: var(--font-display);
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--kin);
    letter-spacing: 0.16em;
    padding-bottom: 2px;
    border-bottom: 1px solid var(--kin);
    line-height: 1;
    z-index: 4;
}

.plate-recto-content {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    z-index: 2;
}

.plate-illustration {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1.6rem 0 0.8rem;
    min-height: 0;
}

.plate-illustration svg {
    width: 78%;
    height: 78%;
    max-height: 60%;
}

.plate-text {
    text-align: center;
    padding-top: 0.5rem;
    border-top: 1px solid rgba(168, 168, 168, 0.5);
    margin: 0 6%;
}

.plate-title {
    font-family: var(--font-display);
    font-size: clamp(1rem, 1.6vw, 1.4rem);
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--sumi);
    line-height: 1.05;
    margin: 0.7rem 0 0.4rem;
}

.plate-subtitle {
    font-family: var(--font-label);
    font-weight: 300;
    font-size: clamp(0.65rem, 0.85vw, 0.78rem);
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--nezumi);
    margin-bottom: 0.4rem;
}

/* Verso content */
.plate-verso-content {
    position: relative;
    flex: 1;
    overflow-y: auto;
    z-index: 2;
    padding: 0.4rem 0.2rem;
}

.plate-verso-content::-webkit-scrollbar {
    width: 4px;
}
.plate-verso-content::-webkit-scrollbar-thumb {
    background: rgba(107, 107, 107, 0.3);
    border-radius: 2px;
}

.verso-eyebrow {
    display: block;
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.65rem;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--kin);
    margin: 1.6rem 0 0.5rem;
}

.verso-title {
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 400;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--sumi);
    margin-bottom: 0.9rem;
    line-height: 1.0;
}

.verso-body {
    font-family: var(--font-body);
    font-size: 0.86rem;
    line-height: 1.7;
    color: var(--kuro);
    margin-bottom: 0.7rem;
    text-align: justify;
    hyphens: auto;
}

.verso-body sup {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.65rem;
    color: var(--nezumi);
    margin-left: 1px;
    vertical-align: super;
    line-height: 0;
}

/* Drop cap on first verso paragraph */
.verso-body.first-para::first-letter {
    font-family: var(--font-display);
    font-size: 3em;
    line-height: 0.85;
    float: left;
    padding: 0.05em 0.12em 0 0;
    color: var(--sumi);
    background: linear-gradient(135deg, rgba(212, 212, 212, 0.4) 0%, rgba(212, 212, 212, 0) 70%);
}

.verso-data {
    margin: 0.85rem 0;
    padding: 0.7rem 0;
    border-top: 1px solid rgba(168, 168, 168, 0.55);
    border-bottom: 1px solid rgba(168, 168, 168, 0.55);
}

.verso-data-label {
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.62rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--nezumi);
    margin-bottom: 0.4rem;
}

.verso-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 36px;
}

.verso-bar {
    flex: 1;
    background: linear-gradient(to top, var(--sumi), var(--nezumi));
    opacity: 0.78;
    border-radius: 1px 1px 0 0;
    filter: url(#watercolor-light);
    transition: transform 0.4s var(--ease-quill);
}

.verso-bar:hover {
    transform: scaleY(1.06);
    opacity: 1;
}

.verso-footnotes {
    border-top: 1px dotted rgba(107, 107, 107, 0.55);
    padding-top: 0.6rem;
    margin-top: 0.5rem;
}

.verso-footnotes p {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.7rem;
    line-height: 1.55;
    color: var(--nezumi);
    margin-bottom: 0.3rem;
}

.verso-footnotes sup {
    font-style: normal;
    color: var(--kin);
    margin-right: 3px;
}

.plate-illustration .ink {
    fill: var(--sumi);
    opacity: 0.62;
}

.plate-illustration .ink-stroke {
    fill: none;
    stroke: var(--sumi);
    stroke-width: 1.6;
    opacity: 0.65;
}

.plate-illustration .ink-light {
    fill: var(--nezumi);
    opacity: 0.4;
}

.plate-illustration .gold {
    fill: var(--kin);
    opacity: 0.72;
}

/* Marginalia (wide screens only) ------------------------------------ */
.marginalia {
    display: none;
}

@media (min-width: 1500px) {
    .marginalia {
        display: block;
        position: fixed;
        right: clamp(0.5rem, 2vw, 1.5rem);
        top: 50%;
        transform: translateY(-50%);
        max-width: 180px;
        z-index: 5;
        pointer-events: none;
    }

    .margin-note {
        margin-bottom: 2rem;
        padding-left: 14px;
        border-left: 1px solid rgba(168, 168, 168, 0.55);
        position: relative;
    }

    .margin-note::before {
        content: "";
        position: absolute;
        left: -1px;
        top: 6px;
        width: 8px;
        height: 1px;
        background: var(--kin);
    }

    .margin-num {
        display: block;
        font-family: var(--font-display);
        font-size: 0.9rem;
        color: var(--kin);
        letter-spacing: 0.1em;
        margin-bottom: 0.3rem;
    }

    .margin-note p {
        font-family: var(--font-body);
        font-style: italic;
        font-size: 0.7rem;
        line-height: 1.6;
        color: var(--nezumi);
    }
}

/* Colophon ---------------------------------------------------------- */
.colophon {
    position: relative;
    background: var(--kami);
    border-top: 1px solid rgba(42, 42, 42, 0.4);
    margin-top: clamp(3rem, 8vh, 6rem);
    padding: clamp(3rem, 8vh, 6rem) clamp(1.5rem, 4vw, 4rem) clamp(2rem, 4vh, 3rem);
    z-index: 2;
}

.colophon::before {
    content: "";
    position: absolute;
    top: -1px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 12px;
    height: 12px;
    background: var(--kin);
}

.colophon-inner {
    max-width: var(--grid-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
}

@media (max-width: 720px) {
    .colophon-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .colophon-seal {
        margin: 0 auto;
    }
}

.colophon-seal {
    width: 200px;
    height: 200px;
    flex-shrink: 0;
}

.colophon-seal svg {
    width: 100%;
    height: 100%;
}

.colophon-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--sumi);
    line-height: 1.0;
    margin-bottom: 1.5rem;
}

.colophon-body {
    font-family: var(--font-body);
    font-size: clamp(0.9rem, 1.05vw, 1rem);
    line-height: 1.78;
    color: var(--kuro);
    margin-bottom: 1.25rem;
    text-align: justify;
    hyphens: auto;
}

.colophon-body em {
    font-style: italic;
    color: var(--suzu);
}

.dropcap {
    font-family: var(--font-display);
    font-size: 3.6em;
    line-height: 0.85;
    float: left;
    padding: 0.05em 0.18em 0 0;
    color: var(--sumi);
    background: linear-gradient(135deg, rgba(212, 212, 212, 0.55) 0%, rgba(212, 212, 212, 0) 70%);
    margin-right: 4px;
}

.colophon-meta {
    list-style: none;
    margin-top: 2rem;
    padding-top: 1.25rem;
    border-top: 1px solid rgba(168, 168, 168, 0.55);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.8rem 2rem;
}

@media (max-width: 480px) {
    .colophon-meta { grid-template-columns: 1fr; }
}

.colophon-meta li {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.meta-key {
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.66rem;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--kin);
}

.meta-val {
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.92rem;
    color: var(--kuro);
}

.colophon-footer {
    margin-top: clamp(2.5rem, 5vh, 4rem);
    padding-top: 1.5rem;
    border-top: 1px solid rgba(42, 42, 42, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    font-family: var(--font-label);
    font-weight: 300;
    font-size: 0.72rem;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--nezumi);
}

/* Mobile tweaks ----------------------------------------------------- */
@media (max-width: 768px) {
    .hero-eyebrow,
    .hero-meta {
        font-size: 0.66rem;
        letter-spacing: 0.28em;
    }
    .index-trigger-text { display: none; }
    .index-trigger-rule { width: 24px; }
    .index-trigger:hover .index-trigger-rule { width: 38px; }
}

@media (prefers-reduced-motion: reduce) {
    .hero-molecule,
    .hero-blob,
    .scroll-arrow {
        animation: none;
    }

    .plate.is-visible,
    .t-letter.is-revealed {
        opacity: 1;
        transform: none;
    }

    .hero-subtitle.is-revealed { clip-path: inset(0 0 0 0); }
}