/* ========================================================================
   haskell.monster — subaqueous, zen-contemplative, masonry, morph
   Palette: #7fdbda #e8f0ed #f4f9f7 #6b8a85 #2d3436 #8fb8b0 #9b7fb0 #1a1040 #c4a96a
   Fonts:   Nunito Sans (display/body), Fira Code (code), Caveat (annotation)
   ======================================================================== */

:root {
    --sea-foam-mist: #e8f0ed;
    --abyssal-ink: #1a1040;
    --kelp-charcoal: #2d3436;
    --reef-gray: #6b8a85;
    --biolum-teal: #7fdbda;
    --cephalopod-mauve: #9b7fb0;
    --diatom-gold: #c4a96a;
    --plankton-white: #f4f9f7;
    --reef-gray-soft: #8fb8b0;

    /* Scroll-linked morph variables (updated by JS) */
    --scroll-depth: 0;           /* 0 .. 1 through the document */
    --text-color: var(--kelp-charcoal);
    --grid-opacity: 0.2;
    --block-bg: rgba(244, 249, 247, 0.72);
    --block-border: rgba(143, 184, 176, 0.28);

    --display: "Nunito Sans", "Helvetica Neue", Arial, sans-serif;
    --mono: "Fira Code", "JetBrains Mono", Menlo, monospace;
    --hand: "Caveat", "Kalam", cursive;

    --gutter: 2rem;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--display);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.75;
    letter-spacing: 0.01em;
    color: var(--text-color);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    background-color: var(--sea-foam-mist);
    background-image:
        radial-gradient(ellipse 80vw 60vh at 50% 5vh,   var(--plankton-white) 0%, transparent 60%),
        radial-gradient(ellipse 60vw 50vh at 20% 120vh, rgba(127, 219, 218, 0.18) 0%, transparent 70%),
        radial-gradient(ellipse 70vw 60vh at 80% 260vh, rgba(155, 127, 176, 0.14) 0%, transparent 75%),
        radial-gradient(ellipse 90vw 80vh at 30% 450vh, rgba(26, 16, 64, 0.35) 0%, transparent 80%),
        linear-gradient(180deg,
            var(--sea-foam-mist) 0%,
            #dde8e6 12%,
            #b8d3d1 28%,
            #7fa6ad 45%,
            #4a5a7a 62%,
            #2a2655 78%,
            var(--abyssal-ink) 100%);
    background-attachment: fixed, fixed, fixed, fixed, fixed;
    background-size: 100% 100%;
    transition: color 800ms ease;
}

.svg-defs { position: absolute; width: 0; height: 0; }

/* ---------------- Grid overlay ---------------- */
.grid-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    opacity: var(--grid-opacity);
    transition: opacity 600ms ease;
    background-image:
        repeating-linear-gradient(0deg,   rgba(127, 219, 218, 0.9) 0 1px, transparent 1px 60px),
        repeating-linear-gradient(90deg,  rgba(127, 219, 218, 0.9) 0 1px, transparent 1px 60px);
    mix-blend-mode: screen;
    mask-image: linear-gradient(180deg, rgba(0,0,0,0.9), rgba(0,0,0,0.9) 50%, rgba(0,0,0,0.3) 85%, rgba(0,0,0,0.1) 100%);
}

/* ---------------- Bubbles ---------------- */
.bubbles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 2;
    overflow: hidden;
}

.bubble {
    position: absolute;
    left: var(--x, 50%);
    bottom: -40px;
    width: var(--size, 12px);
    height: var(--size, 12px);
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%,
        rgba(255, 255, 255, 0.85) 0%,
        rgba(255, 255, 255, 0.35) 35%,
        rgba(127, 219, 218, 0.15) 70%,
        transparent 100%);
    border: 1px solid rgba(255, 255, 255, 0.25);
    opacity: 0;
    animation: bubble-rise var(--dur, 20s) linear var(--delay, 0s) infinite;
    mix-blend-mode: screen;
    filter: blur(0.4px);
}

@keyframes bubble-rise {
    0%   { transform: translate3d(0, 0, 0) scale(0.6);      opacity: 0;   }
    10%  { opacity: 0.7; }
    50%  { transform: translate3d(var(--drift, 15px), -55vh, 0) scale(1); opacity: 0.55; }
    90%  { opacity: 0.25; }
    100% { transform: translate3d(calc(var(--drift, 15px) * -0.5), -112vh, 0) scale(0.7); opacity: 0; }
}

/* ---------------- Compass ---------------- */
.compass {
    position: fixed;
    right: 24px;
    bottom: 24px;
    width: 96px;
    height: 96px;
    z-index: 20;
}

.compass-ring {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background: rgba(232, 240, 237, 0.15);
    border: 1px solid rgba(127, 219, 218, 0.3);
    box-shadow: 0 4px 18px rgba(26, 16, 64, 0.18), inset 0 0 20px rgba(127, 219, 218, 0.08);
    transition: transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.compass-ring:hover { transform: rotate(45deg); }

.compass svg { position: absolute; inset: 0; }
.compass-circle { fill: none; stroke: rgba(127, 219, 218, 0.45); stroke-width: 0.6; }
.compass-inner  { fill: none; stroke: rgba(155, 127, 176, 0.5);  stroke-width: 0.4; stroke-dasharray: 2 2; }
.compass-axis   { stroke: rgba(127, 219, 218, 0.35); stroke-width: 0.3; }
.compass-pivot  { fill: var(--biolum-teal); }

.compass-label {
    position: absolute;
    font-family: var(--hand);
    font-size: 0.78rem;
    color: var(--reef-gray-soft);
    background: transparent;
    border: 0;
    padding: 2px 5px;
    cursor: pointer;
    letter-spacing: 0.02em;
    line-height: 1;
    transition: color 200ms ease, transform 200ms ease;
}
.compass-label:hover { color: var(--biolum-teal); transform: scale(1.08); }

.compass-n { top: -14px;  left: 50%; transform: translateX(-50%); }
.compass-e { right: -12px; top: 50%; transform: translateY(-50%); }
.compass-s { bottom: -14px; left: 50%; transform: translateX(-50%); }
.compass-w { left: -14px; top: 50%; transform: translateY(-50%); }

.compass-n:hover { transform: translateX(-50%) scale(1.1); }
.compass-e:hover { transform: translateY(-50%) scale(1.1); }
.compass-s:hover { transform: translateX(-50%) scale(1.1); }
.compass-w:hover { transform: translateY(-50%) scale(1.1); }

/* ---------------- Zones (general) ---------------- */
.zone {
    position: relative;
    padding: 10vh 6vw 12vh;
    z-index: 5;
}

.zone-surface     { padding: 0; min-height: 100vh; }
.zone-shallows    { min-height: 150vh; }
.zone-thermocline { min-height: 150vh; }
.zone-mesopelagic { min-height: 200vh; }
.zone-abyssal     { min-height: 150vh; color: var(--sea-foam-mist); }

.zone-header {
    display: flex;
    align-items: baseline;
    gap: 1.25rem;
    margin: 0 auto 6vh;
    max-width: 1400px;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(143, 184, 176, 0.25);
}

.zone-header-deep {
    border-bottom-color: rgba(127, 219, 218, 0.25);
}

.zone-index {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--cephalopod-mauve);
    letter-spacing: 0.12em;
}

.zone-title {
    font-family: var(--display);
    font-weight: 200;
    font-size: clamp(1.8rem, 4vw, 3rem);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin: 0;
    flex: 1;
    color: inherit;
}

.zone-depth {
    font-family: var(--hand);
    font-size: 0.95rem;
    color: var(--reef-gray-soft);
    opacity: 0.9;
}

/* ---------------- Surface zone ---------------- */
.surface-inner {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    padding: 10vh 6vw 14vh;
    overflow: hidden;
}

.title {
    margin: 0 0 12vh;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

.title-top {
    font-family: var(--display);
    font-weight: 200;
    font-size: clamp(3rem, 10vw, 7rem);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--kelp-charcoal);
    opacity: 0.6;
    line-height: 1;
    display: inline-flex;
    gap: 0;
}

.title-top .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    animation: letter-settle 900ms cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.title-top .letter:nth-child(1) { animation-delay: 200ms; }
.title-top .letter:nth-child(2) { animation-delay: 280ms; }
.title-top .letter:nth-child(3) { animation-delay: 360ms; }
.title-top .letter:nth-child(4) { animation-delay: 440ms; }
.title-top .letter:nth-child(5) { animation-delay: 520ms; }
.title-top .letter:nth-child(6) { animation-delay: 600ms; }
.title-top .letter:nth-child(7) { animation-delay: 680ms; }

@keyframes letter-settle {
    to { opacity: 0.6; transform: translateY(0); }
}

.title-rule {
    display: block;
    width: 40vw;
    max-width: 520px;
    height: 1px;
    background: var(--reef-gray);
    opacity: 0;
    animation: rule-draw 700ms cubic-bezier(0.34, 1.56, 0.64, 1) 900ms forwards;
    transform-origin: center;
    transform: scaleX(0);
}

@keyframes rule-draw {
    to { opacity: 0.3; transform: scaleX(1); }
}

.title-bottom {
    font-family: var(--display);
    font-weight: 600;
    font-size: clamp(1.5rem, 4vw, 3rem);
    color: var(--biolum-teal);
    letter-spacing: 0.05em;
    opacity: 0;
    transform: scale(0.8);
    animation: title-bottom-morph 700ms cubic-bezier(0.34, 1.56, 0.64, 1) 1400ms forwards;
    text-shadow: 0 0 30px rgba(127, 219, 218, 0.35);
}

@keyframes title-bottom-morph {
    to { opacity: 1; transform: scale(1); }
}

.surface-caption {
    font-family: var(--hand);
    color: var(--reef-gray-soft);
    font-size: 1.1rem;
    margin: 1rem 0 0;
    opacity: 0;
    animation: caption-in 800ms ease-out 2000ms forwards;
}

@keyframes caption-in { to { opacity: 0.8; } }

.scroll-cue {
    position: absolute;
    bottom: 4vh;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--reef-gray-soft);
    opacity: 0;
    animation: caption-in 800ms ease-out 2400ms forwards;
}

.scroll-arrow {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--biolum-teal), transparent);
    position: relative;
    animation: scroll-pulse 2.4s ease-in-out infinite;
}

@keyframes scroll-pulse {
    0%,100% { transform: scaleY(1); opacity: 0.9; }
    50%     { transform: scaleY(0.5) translateY(20px); opacity: 0.3; }
}

.surface-wash {
    position: absolute;
    inset: auto -10% -10% -10%;
    height: 38vh;
    background: radial-gradient(ellipse at 50% 100%,
        rgba(127, 219, 218, 0.32) 0%,
        rgba(143, 184, 176, 0.18) 40%,
        transparent 75%);
    filter: url(#watercolor-distort);
    pointer-events: none;
}

/* ---------------- Ornament divider ---------------- */
.ornament-divider {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3vh 0 1vh;
    position: relative;
    z-index: 6;
}

.ornament-divider svg {
    animation: ornament-pulse 8s ease-in-out infinite;
}

@keyframes ornament-pulse {
    0%, 100% { opacity: 1; transform: rotate(0deg); }
    50%      { opacity: 0.7; transform: rotate(2deg); }
}

/* ---------------- Type signature ribbons ---------------- */
.ribbon {
    position: relative;
    overflow: hidden;
    padding: 2.5rem 0;
    z-index: 6;
    border-top: 1px solid rgba(143, 184, 176, 0.15);
    border-bottom: 1px solid rgba(143, 184, 176, 0.15);
    margin: 3vh 0;
}

.ribbon-track {
    display: inline-flex;
    gap: 4rem;
    white-space: nowrap;
    font-family: var(--mono);
    font-weight: 300;
    font-size: clamp(1.2rem, 2.2vw, 2.4rem);
    letter-spacing: 0.04em;
    animation: ribbon-flow 60s linear infinite;
    will-change: transform;
}

.ribbon-track.reverse { animation: ribbon-flow-reverse 80s linear infinite; }

@keyframes ribbon-flow {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}
@keyframes ribbon-flow-reverse {
    0%   { transform: translateX(-50%); }
    100% { transform: translateX(0); }
}

.ribbon .sig {
    display: inline-block;
    padding-right: 4rem;
}

.c-teal  { color: var(--biolum-teal); }
.c-mauve { color: var(--cephalopod-mauve); }
.c-reef  { color: var(--reef-gray-soft); }
.c-gold  { color: var(--diatom-gold); }

/* ---------------- Masonry ---------------- */
.masonry {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 10px;
    gap: var(--gutter);
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
}

.masonry-dense { gap: 1.6rem; }
.masonry-overlap { gap: 1.2rem; }

/* column grouping for cascade delays */
.block[data-col="left"]   { --col-delay: 0ms;   }
.block[data-col="center"] { --col-delay: 100ms; }
.block[data-col="right"]  { --col-delay: 200ms; }

/* span heights */
.b-row-10 { grid-row-end: span 22; }
.b-row-11 { grid-row-end: span 25; }
.b-row-12 { grid-row-end: span 28; }
.b-row-13 { grid-row-end: span 31; }
.b-row-14 { grid-row-end: span 33; }
.b-row-15 { grid-row-end: span 36; }
.b-row-16 { grid-row-end: span 39; }
.b-row-17 { grid-row-end: span 42; }
.b-row-18 { grid-row-end: span 45; }
.b-row-19 { grid-row-end: span 47; }
.b-row-20 { grid-row-end: span 50; }
.b-row-22 { grid-row-end: span 55; }
.b-row-24 { grid-row-end: span 60; }

/* widths via column-span */
.block-wide   { grid-column: span 2; }
.block-medium { grid-column: span 1; }
.block-narrow { grid-column: span 1; }
.block-small  { grid-column: span 1; }
.block-tall   { grid-column: span 1; }

.offset-down { margin-top: 3rem; }

/* ---------------- Block ---------------- */
.block {
    position: relative;
    padding: 1.6rem 1.6rem 1.8rem;
    background: var(--block-bg);
    border: 1px solid var(--block-border);
    border-radius: 2px;
    isolation: isolate;
    overflow: visible;
    opacity: 0;
    transform: scale(0.92);
    filter: blur(4px);
    transition:
        opacity 600ms cubic-bezier(0.34, 1.56, 0.64, 1) var(--col-delay, 0ms),
        transform 600ms cubic-bezier(0.34, 1.56, 0.64, 1) var(--col-delay, 0ms),
        filter 600ms ease var(--col-delay, 0ms),
        background 600ms ease,
        border-color 600ms ease;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    box-shadow:
        0 1px 0 rgba(255,255,255,0.3) inset,
        0 8px 24px rgba(26, 16, 64, 0.06),
        0 2px 6px rgba(26, 16, 64, 0.04);
}

.block.revealed {
    opacity: 1;
    transform: scale(1);
    filter: blur(0);
}

/* Watercolor wash behind each block */
.block::before {
    content: "";
    position: absolute;
    inset: -20px;
    border-radius: 40% 60% 55% 45% / 50% 40% 60% 50%;
    background: radial-gradient(ellipse at center,
        rgba(127, 219, 218, 0.28) 0%,
        rgba(127, 219, 218, 0.1) 40%,
        transparent 70%);
    filter: url(#watercolor-distort);
    opacity: 0.55;
    pointer-events: none;
    z-index: -1;
}

/* wash color variations by zone */
.zone-shallows    .block::before { background: radial-gradient(ellipse at 40% 50%, rgba(127, 219, 218, 0.32) 0%, rgba(143, 184, 176, 0.12) 40%, transparent 72%); }
.zone-thermocline .block::before { background: radial-gradient(ellipse at 60% 40%, rgba(155, 127, 176, 0.3) 0%, rgba(127, 219, 218, 0.14) 45%, transparent 72%); filter: url(#watercolor-distort-b); }
.zone-mesopelagic .block::before { background: radial-gradient(ellipse at 50% 60%, rgba(155, 127, 176, 0.35) 0%, rgba(26, 16, 64, 0.25) 45%, transparent 75%); filter: url(#watercolor-distort-c); }
.zone-abyssal     .block::before { background: radial-gradient(ellipse at 50% 40%, rgba(127, 219, 218, 0.32) 0%, rgba(26, 16, 64, 0.4) 45%, transparent 80%); filter: url(#watercolor-distort-b); }

/* Clip-path notches — the monster's bite */
.notch-tr { clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%); }
.notch-tl { clip-path: polygon(28px 0, 100% 0, 100% 100%, 0 100%, 0 28px); }
.notch-br { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%); }
.notch-bl { clip-path: polygon(0 0, 100% 0, 100% 100%, 28px 100%, 0 calc(100% - 28px)); }

/* Depth indicator bar on left edge */
.depth-bar {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg,
        color-mix(in oklab, var(--biolum-teal) calc((1 - var(--bar)) * 100%), var(--abyssal-ink)),
        color-mix(in oklab, var(--biolum-teal) calc((1 - var(--bar)) * 80%),  var(--abyssal-ink)));
    border-radius: 0 2px 2px 0;
    box-shadow: 0 0 8px rgba(127, 219, 218, 0.25);
}

.block-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--reef-gray);
    margin-bottom: 1.2rem;
    padding-bottom: 0.6rem;
    border-bottom: 1px dashed rgba(143, 184, 176, 0.3);
}

.block-kind { color: var(--cephalopod-mauve); }
.block-id   { color: var(--diatom-gold); }

.block h3 {
    font-family: var(--display);
    font-weight: 200;
    font-size: clamp(1.4rem, 2.4vw, 2rem);
    line-height: 1.2;
    letter-spacing: 0.04em;
    margin: 0 0 1rem;
    color: inherit;
}

.block h4 {
    font-family: var(--display);
    font-weight: 400;
    font-size: 1.1rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: 0 0 0.8rem;
    color: var(--cephalopod-mauve);
}

.block p {
    margin: 0 0 1rem;
    color: inherit;
    opacity: 0.92;
}

.block p.handwritten {
    font-family: var(--hand);
    font-size: 1.15rem;
    color: var(--reef-gray-soft);
    opacity: 0.85;
    line-height: 1.4;
}

/* ---------------- Code blocks ---------------- */
.code {
    font-family: var(--mono);
    font-weight: 400;
    font-size: clamp(0.82rem, 1vw, 0.98rem);
    line-height: 1.6;
    letter-spacing: 0.04em;
    padding: 0.4rem 0 0.4rem 1rem;
    margin: 0 0 1rem;
    border-left: 2px solid var(--biolum-teal);
    background: transparent;
    white-space: pre;
    overflow-x: auto;
    color: inherit;
}

.sig-block { font-size: 0.85rem; line-height: 1.75; }

/* ---------------- Lambdas ---------------- */
.lambda {
    position: absolute;
    font-family: var(--mono);
    font-weight: 300;
    color: var(--cephalopod-mauve);
    opacity: 0.22;
    pointer-events: none;
    user-select: none;
    animation: drift 6s ease-in-out infinite;
    will-change: transform;
}

.lambda-a { top: 10px; right: 14px; font-size: 2.2rem; animation-duration: 5s; }
.lambda-b { bottom: 18px; right: 18px; font-size: 3.5rem; animation-duration: 7s; opacity: 0.15; }
.lambda-c { top: 24px; right: 20px; font-size: 4rem; animation-duration: 8s; opacity: 0.18; }
.lambda-d { bottom: 14px; left: 26px; font-size: 1.6rem; animation-duration: 4s; opacity: 0.3; }
.lambda-e { bottom: 12px; right: 12px; font-size: 2rem; animation-duration: 5.5s; }
.lambda-f { top: 14px; right: 14px; font-size: 3rem; animation-duration: 6.5s; }
.lambda-g { bottom: 18px; right: 20px; font-size: 2.4rem; animation-duration: 5s; }
.lambda-h { top: 10px; right: 18px; font-size: 1.8rem; animation-duration: 7s; }
.lambda-deep {
    bottom: 14px;
    right: 16px;
    font-size: 3.5rem;
    animation-duration: 9s;
    opacity: 0.4;
}

@keyframes drift {
    0%,100% { transform: translateY(0) rotate(0deg); }
    50%     { transform: translateY(-15px) rotate(5deg); }
}

/* Bioluminescent glow variants (deep zones) */
.block.glow {
    background: rgba(26, 16, 64, 0.38);
    border-color: rgba(127, 219, 218, 0.28);
    color: var(--sea-foam-mist);
    box-shadow:
        0 0 0 1px rgba(127, 219, 218, 0.05) inset,
        0 0 24px rgba(127, 219, 218, 0.12),
        0 6px 30px rgba(0, 0, 0, 0.35);
}

.block.glow h4 { color: var(--biolum-teal); }
.block.glow .block-head { color: var(--reef-gray-soft); border-bottom-color: rgba(127, 219, 218, 0.18); }
.block.glow .block-kind { color: var(--cephalopod-mauve); }
.block.glow .block-id   { color: var(--diatom-gold); }
.block.glow p.handwritten { color: var(--biolum-teal); opacity: 0.75; }
.block.glow .code { border-left-color: var(--biolum-teal); color: var(--sea-foam-mist); }

.glow-lambda {
    color: var(--biolum-teal);
    opacity: 0.7;
    text-shadow: 0 0 12px var(--biolum-teal), 0 0 24px rgba(127, 219, 218, 0.4);
}

/* ---------------- Abyssal stage ---------------- */
.abyssal-stage {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 2rem;
    padding-top: 4vh;
    align-items: start;
}

.leviathan-wrap {
    grid-column: 1 / -1;
    padding: 6vh 0 4vh;
}

.leviathan-sig {
    font-family: var(--mono);
    font-weight: 300;
    font-size: clamp(1.4rem, 3.2vw, 3rem);
    line-height: 1.4;
    letter-spacing: 0.04em;
    color: var(--biolum-teal);
    text-shadow: 0 0 30px rgba(127, 219, 218, 0.25);
    margin: 0;
    opacity: 0.95;
}

.sig-line { display: block; }
.sig-line.indent { padding-left: 2.5em; }

.deep-block {
    grid-column: span 1 !important;
}

.abyssal-footer {
    max-width: 1400px;
    margin: 10vh auto 0;
    padding: 3rem 0 4rem;
    text-align: center;
    border-top: 1px solid rgba(127, 219, 218, 0.15);
}

.colophon {
    font-family: var(--mono);
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    color: var(--reef-gray-soft);
    opacity: 0.7;
    margin: 0;
}

/* ---------------- Scroll-linked zone background variables applied via body data-zone ---------------- */
body[data-zone="0"] { --grid-opacity: 0.2; --text-color: var(--kelp-charcoal); --block-bg: rgba(244, 249, 247, 0.72); --block-border: rgba(143, 184, 176, 0.28); }
body[data-zone="1"] { --grid-opacity: 0.18; --text-color: var(--kelp-charcoal); --block-bg: rgba(244, 249, 247, 0.68); --block-border: rgba(143, 184, 176, 0.3); }
body[data-zone="2"] { --grid-opacity: 0.13; --text-color: var(--kelp-charcoal); --block-bg: rgba(232, 240, 237, 0.55); --block-border: rgba(155, 127, 176, 0.3); }
body[data-zone="3"] { --grid-opacity: 0.08; --text-color: var(--sea-foam-mist); --block-bg: rgba(26, 16, 64, 0.4); --block-border: rgba(127, 219, 218, 0.22); }
body[data-zone="4"] { --grid-opacity: 0.05; --text-color: var(--sea-foam-mist); --block-bg: rgba(26, 16, 64, 0.55); --block-border: rgba(127, 219, 218, 0.25); }

/* ---------------- Responsive ---------------- */
@media (max-width: 900px) {
    .masonry {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.4rem;
    }
    .block-wide { grid-column: span 2; }
    .abyssal-stage { grid-template-columns: 1fr; }
    .compass { width: 78px; height: 78px; right: 16px; bottom: 16px; }
    .compass-label { font-size: 0.7rem; }
}

@media (max-width: 600px) {
    .masonry { grid-template-columns: 1fr; gap: 1.2rem; }
    .block-wide, .block-medium, .block-narrow, .block-small, .block-tall { grid-column: span 1; }
    .block[data-col="left"]   { margin-left: 0;     }
    .block[data-col="center"] { margin-left: 1rem;  }
    .block[data-col="right"]  { margin-left: 0;     }
    .zone { padding: 6vh 5vw 8vh; }
    .ribbon-track { font-size: 1.1rem; }
    .leviathan-sig { font-size: 1.15rem; }
    .sig-line.indent { padding-left: 1em; }
}

/* ---------------- Reduced motion ---------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 200ms !important;
    }
    .bubble { display: none; }
    .ribbon-track { animation: none; }
    .lambda { animation: none; }
    .block { opacity: 1; transform: none; filter: none; }
}