/* ============================================================
   moral.quest — slow ethical wind tunnel
   Strict eight-grey monochrome. Zero hue. Layered Z-depth.
   ============================================================ */

:root {
    /* The eight calibrated greys */
    --vitrine-dark:    #0C0D0F; /* deepest background */
    --graphite-plinth: #15171A; /* base plane the grid is engraved on */
    --haze-mid:        #22262B; /* drifting middle-distance strata */
    --engraved-line:   #3A3F46; /* the luminous grid lattice */
    --caliper-grey:    #6B7178; /* secondary text, labels, coordinate ticks */
    --reading-grey:    #9EA4AB; /* primary body text */
    --bone:            #C9CDD2; /* dilemma headline; brightest type */
    --frost-highlight: #F2F3F4; /* 1px edge highlight + the single filament */

    /* Z-layer offsets (perspective-driven) */
    --z-grid:   -240px;
    --z-haze:   -120px;
    --z-fore:      0px;

    /* glass */
    --glass-fill:        rgba(242, 243, 244, 0.045);
    --glass-fill-hover:  rgba(242, 243, 244, 0.07);
    --glass-border:      rgba(242, 243, 244, 0.10);
    --glass-border-hov:  rgba(242, 243, 244, 0.20);
    --glass-top:         rgba(242, 243, 244, 0.55);
    --glass-shadow:      rgba(0, 0, 0, 0.55);

    --grid-cell: 24px;

    --ease-slow: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);

    --font-mono:   'Space Mono', 'IBM Plex Mono', ui-monospace, monospace;
    --font-micro:  'IBM Plex Mono', ui-monospace, monospace;
    --font-serif:  'Newsreader', Georgia, 'Times New Roman', serif;
    --font-sans:   'Inter', Helvetica, 'Helvetica Neue', Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    background: var(--vitrine-dark);
    color: var(--reading-grey);
    font-family: var(--font-serif);
    font-size: 17.5px;
    line-height: 1.72;
    overflow-x: hidden;
    /* establish 3D context so parallax planes read as distinct depths */
    perspective: 1px;
    perspective-origin: 50% 0%;
}

/* ============================================================
   LAYER -240px : engraved grid plane (fixed, behind everything)
   ============================================================ */
.grid-plane {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: var(--graphite-plinth);
    /* the grid breathes: 0.6% scale oscillation over ~40s */
    animation: gridBreath 40s ease-in-out infinite;
    will-change: transform;
}
.grid-plane::after {
    /* faint plinth vignette so the lattice fades at the edges */
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(130% 110% at 50% 38%,
                rgba(12,13,15,0) 40%,
                rgba(12,13,15,0.55) 78%,
                rgba(12,13,15,0.9) 100%);
}
#gridCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}
@keyframes gridBreath {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.006); }
}

/* coordinate numerals — IBM Plex Mono, etched scale */
.grid-coords {
    position: absolute;
    font-family: var(--font-micro);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--caliper-grey);
    opacity: 0.34;
}
.grid-coords span {
    position: absolute;
    white-space: nowrap;
}
.grid-coords--left {
    top: 0; left: 14px; bottom: 0; width: 56px;
}
.grid-coords--left span { left: 0; transform: translateY(-50%); }
.grid-coords--top {
    left: 0; top: 12px; right: 0; height: 18px;
}
.grid-coords--top span { top: 0; transform: translateX(-50%); }

/* ============================================================
   MID-Z : drifting monochrome haze strata
   ============================================================ */
.haze-field {
    position: fixed;
    inset: -10%;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}
.haze {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    will-change: transform;
}
.haze--1 {
    width: 60vw; height: 60vw;
    left: -12vw; top: 6vh;
    background: radial-gradient(circle, rgba(34,38,43,0.85) 0%, rgba(34,38,43,0) 70%);
    animation: hazeDrift1 64s ease-in-out infinite alternate;
}
.haze--2 {
    width: 52vw; height: 52vw;
    right: -10vw; top: 120vh;
    background: radial-gradient(circle, rgba(34,38,43,0.7) 0%, rgba(34,38,43,0) 72%);
    animation: hazeDrift2 78s ease-in-out infinite alternate;
}
.haze--3 {
    width: 70vw; height: 70vw;
    left: 8vw; top: 280vh;
    background: radial-gradient(circle, rgba(34,38,43,0.6) 0%, rgba(34,38,43,0) 74%);
    animation: hazeDrift3 92s ease-in-out infinite alternate;
}
@keyframes hazeDrift1 {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(5vw, 3vh, 0); }
}
@keyframes hazeDrift2 {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(-4vw, -4vh, 0); }
}
@keyframes hazeDrift3 {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(3vw, -3vh, 0); }
}

/* ============================================================
   FOREGROUND : the narrative document
   ============================================================ */
.vitrine {
    position: relative;
    z-index: 2;
}

.station {
    position: relative;
    min-height: 100vh;
    padding: 16vh 6vw 18vh;
    display: flex;
    align-items: center;
}
.station-inner {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    /* content occupies a generous-margin band */
    padding-left: clamp(0px, 6vw, 96px);
    padding-right: clamp(0px, 6vw, 96px);
}
.station-inner--center { text-align: center; max-width: 900px; }
.station-inner--narrow { max-width: 740px; }

/* ----- station plates (the only headers) ----- */
.station-plate {
    font-family: var(--font-micro);
    font-size: 12px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--caliper-grey);
    display: inline-flex;
    align-items: baseline;
    gap: 0.7em;
    padding-bottom: 8px;
    margin-bottom: 4vh;
    border-bottom: 1px solid var(--engraved-line);
}
.station-inner--center .station-plate { margin-left: auto; margin-right: auto; }
.plate-num { color: var(--reading-grey); }
.plate-em-dash { color: var(--engraved-line); }

.station-lede {
    font-family: var(--font-serif);
    font-size: clamp(1.05rem, 1.7vw, 1.32rem);
    color: var(--caliper-grey);
    max-width: 46ch;
    margin-bottom: 6vh;
}
.station-lede em { font-style: italic; }

/* ============================================================
   GLASS PANES — real frosted glass, edge-lit, seated in Z
   ============================================================ */
.pane {
    position: relative;
    background: var(--glass-fill);
    border: 1px solid var(--glass-border);
    border-radius: 3px;
    backdrop-filter: blur(16px) saturate(0);
    -webkit-backdrop-filter: blur(16px) saturate(0);
    box-shadow:
        0 28px 60px -24px var(--glass-shadow),
        0 8px 22px -10px rgba(0,0,0,0.4);
    padding: clamp(28px, 3.6vw, 56px);
    transition:
        transform 480ms var(--ease-slow),
        backdrop-filter 480ms var(--ease-soft),
        box-shadow 480ms var(--ease-soft),
        border-color 480ms var(--ease-soft),
        background 480ms var(--ease-soft);
    will-change: transform;
}
/* 1px inset top highlight in Frost Highlight */
.pane::before {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 0;
    height: 1px;
    background: linear-gradient(90deg,
        rgba(242,243,244,0) 0%,
        var(--glass-top) 18%,
        var(--glass-top) 82%,
        rgba(242,243,244,0) 100%);
    opacity: 0.55;
}
/* fallback hint of grid for no-backdrop-filter browsers */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    .pane {
        background:
            linear-gradient(rgba(34,38,43,0.7), rgba(34,38,43,0.7)),
            repeating-linear-gradient(0deg, rgba(58,63,70,0.18) 0 1px, transparent 1px 24px),
            repeating-linear-gradient(90deg, rgba(58,63,70,0.18) 0 1px, transparent 1px 24px);
    }
}

/* hover/focus: forward in Z, +blur, edge brightens — no color */
.pane:hover {
    transform: translateZ(0) translateY(-4px) scale(1.006);
    backdrop-filter: blur(22px) saturate(0);
    -webkit-backdrop-filter: blur(22px) saturate(0);
    background: var(--glass-fill-hover);
    border-color: var(--glass-border-hov);
    box-shadow:
        0 44px 90px -28px var(--glass-shadow),
        0 14px 34px -12px rgba(0,0,0,0.5);
}
.pane:hover::before { opacity: 0.85; }

/* ============================================================
   STATION 01 — THE CASE
   ============================================================ */
.pane--headline {
    max-width: 820px;
    margin: 0 auto;
    padding: clamp(40px, 6vw, 84px) clamp(32px, 6vw, 90px);
}
.case-statement {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: clamp(2.1rem, 5.4vw, 5.2rem);
    line-height: 1.18;
    letter-spacing: 0.02em;
    color: var(--bone);
    text-wrap: balance;
}
.koan {
    margin-top: 3.4em;
    font-family: var(--font-serif);
    font-style: italic;
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--caliper-grey);
    letter-spacing: 0.01em;
}
.koan--shadow { margin-top: 2.6em; }

.scroll-hint {
    margin-top: 9vh;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    font-family: var(--font-micro);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--caliper-grey);
    opacity: 0.6;
}
.hint-tick {
    width: 1px; height: 46px;
    background: linear-gradient(var(--engraved-line), rgba(58,63,70,0));
    animation: hintPulse 6s ease-in-out infinite;
}
@keyframes hintPulse {
    0%, 100% { opacity: 0.4; transform: scaleY(0.8); }
    50%      { opacity: 1;   transform: scaleY(1); }
}

/* ============================================================
   STATION 02 — THE FRAMES (staggered, overlapping panes)
   ============================================================ */
.frames-stack {
    position: relative;
    margin: 2vh 0 8vh;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    /* overlap by pulling rows up via negative margins */
}
.pane--frame {
    grid-row: 1;
    align-self: start;
    border-radius: 3px;
}
/* deliberate stagger + 12-18% pane-on-pane overlap, each a different Z seat */
.pane--frame[data-frame="1"] {
    grid-column: 1 / span 6;
    margin-top: 0;
    z-index: 5;
    transform: translateY(0);
}
.pane--frame[data-frame="2"] {
    grid-column: 5 / span 6;
    margin-top: 5.5rem;
    z-index: 4;
    box-shadow: 0 30px 70px -22px var(--glass-shadow), 0 10px 26px -10px rgba(0,0,0,0.42);
}
.pane--frame[data-frame="3"] {
    grid-column: 2 / span 6;
    margin-top: 11rem;
    z-index: 3;
    box-shadow: 0 34px 84px -22px var(--glass-shadow), 0 12px 30px -10px rgba(0,0,0,0.46);
}
.pane--frame[data-frame="4"] {
    grid-column: 6 / span 6;
    margin-top: 16.5rem;
    z-index: 2;
    box-shadow: 0 38px 96px -22px var(--glass-shadow), 0 14px 34px -10px rgba(0,0,0,0.5);
}
.pane--frame[data-frame="5"] {
    grid-column: 3 / span 6;
    margin-top: 22rem;
    z-index: 1;
    box-shadow: 0 42px 110px -22px var(--glass-shadow), 0 16px 40px -10px rgba(0,0,0,0.54);
}
/* hover: bring forward; neighbours recede slightly (handled in JS too) */
.pane--frame:hover { z-index: 9; }
.frames-stack.has-focus .pane--frame:not(:hover) {
    transform: translateY(0) translateZ(0) scale(0.985);
    opacity: 0.82;
}

.frame-tag {
    display: inline-block;
    font-family: var(--font-micro);
    font-size: 10.5px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--caliper-grey);
    margin-bottom: 1.4em;
}
.frame-title {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: clamp(1.5rem, 2.4vw, 2.2rem);
    line-height: 1.16;
    letter-spacing: 0.02em;
    color: var(--bone);
    margin-bottom: 0.7em;
}
.frame-body {
    font-family: var(--font-serif);
    color: var(--reading-grey);
    max-width: 40ch;
}
.frames-foot {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--caliper-grey);
    max-width: 44ch;
}

/* ============================================================
   STATION 03 — THE WEIGHING (two equal-Z panes + drawn beam)
   ============================================================ */
.weigh-rig {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3.4rem;
    align-items: center;
    margin: 3vh 0 6vh;
}
@media (min-width: 920px) {
    .weigh-rig {
        grid-template-columns: 1fr minmax(220px, 0.85fr) 1fr;
        gap: 2.6rem;
    }
}
.pane--weigh { align-self: stretch; }
.weigh-tag {
    display: inline-block;
    font-family: var(--font-micro);
    font-size: 10.5px;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--caliper-grey);
    margin-bottom: 1.3em;
}
.weigh-body {
    font-family: var(--font-serif);
    color: var(--reading-grey);
    margin-bottom: 1.1em;
}
.weigh-cost {
    font-family: var(--font-micro);
    font-size: 11.5px;
    letter-spacing: 0.06em;
    line-height: 1.7;
    color: var(--caliper-grey);
    border-top: 1px solid var(--engraved-line);
    padding-top: 1em;
}

/* the balance beam — the one line that draws itself */
.beam-housing {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    transition: transform 700ms var(--ease-slow);
    will-change: transform;
}
.beam-svg {
    width: 100%;
    max-width: 320px;
    height: 120px;
    overflow: visible;
}
.beam-path {
    fill: none;
    stroke: var(--frost-highlight);
    stroke-width: 1.1;
    stroke-linecap: round;
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    opacity: 0;
    filter: drop-shadow(0 0 4px rgba(242,243,244,0.25));
}
.beam-path.drawn {
    opacity: 0.92;
    transition: stroke-dashoffset 2400ms var(--ease-slow), opacity 800ms ease;
    stroke-dashoffset: 0;
}
.beam-fulcrum { fill: var(--caliper-grey); }
.beam-stand {
    stroke: var(--engraved-line);
    stroke-width: 1;
    fill: none;
}
.beam-readout {
    margin-top: 6px;
    font-family: var(--font-micro);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--caliper-grey);
    opacity: 0.7;
}
.weigh-foot {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--caliper-grey);
    max-width: 52ch;
}

/* ============================================================
   STATION 04 — THE SHADOW (darkest; grid recedes furthest)
   ============================================================ */
.station--shadow { background: rgba(12,13,15,0.55); }
.pane--shadow {
    backdrop-filter: blur(20px) saturate(0);
    -webkit-backdrop-filter: blur(20px) saturate(0);
    background: rgba(242,243,244,0.035);
    padding: clamp(34px, 5vw, 72px);
}
.shadow-body {
    font-family: var(--font-serif);
    font-size: 16px;
    line-height: 1.85;
    color: var(--reading-grey);
    margin-bottom: 1.5em;
}
.shadow-body--quiet { color: var(--caliper-grey); }

/* ============================================================
   STATION 05 — THE WALK-AROUND (propositions along a center axis)
   ============================================================ */
.walk-axis {
    position: relative;
    margin: 3vh 0 4vh;
    padding: 2vh 0;
}
.walk-spine {
    position: absolute;
    left: 50%;
    top: 0; bottom: 0;
    width: 1px;
    background: linear-gradient(var(--engraved-line), rgba(58,63,70,0.15) 90%, rgba(58,63,70,0));
    transform: translateX(-50%);
}
.pane--prop {
    width: min(46%, 480px);
    margin-bottom: 3.4rem;
    padding: clamp(22px, 2.4vw, 36px);
}
.pane--prop-left  { margin-right: auto; }
.pane--prop-right { margin-left: auto; }
@media (max-width: 720px) {
    .walk-spine { left: 12px; transform: none; }
    .pane--prop { width: calc(100% - 24px); margin-left: auto; margin-right: 0; }
}
.prop-mark {
    display: inline-block;
    font-family: var(--font-micro);
    font-size: 12px;
    letter-spacing: 0.18em;
    color: var(--caliper-grey);
    margin-bottom: 0.7em;
}
.prop-text {
    font-family: var(--font-serif);
    color: var(--reading-grey);
}

/* ============================================================
   STATION 06 — THE OPEN DOOR (panes thin; grid brightens; filament)
   ============================================================ */
.station--door { padding-bottom: 12vh; }
.station--door.door-open .grid-coords { opacity: 0.5; }
.pane--door {
    max-width: 720px;
    margin: 0 auto 6vh;
    background: rgba(242,243,244,0.03);
    backdrop-filter: blur(14px) saturate(0);
    -webkit-backdrop-filter: blur(14px) saturate(0);
    box-shadow: 0 24px 56px -26px var(--glass-shadow);
    text-align: left;
}
.horizon-svg {
    display: block;
    width: 100%;
    height: 40px;
    margin-bottom: 1.6em;
    overflow: visible;
}
.horizon-path {
    fill: none;
    stroke: var(--frost-highlight);
    stroke-width: 1;
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    opacity: 0;
    filter: drop-shadow(0 0 5px rgba(242,243,244,0.3));
}
.horizon-path.drawn {
    opacity: 0.9;
    transition: stroke-dashoffset 3200ms var(--ease-slow), opacity 1000ms ease;
    stroke-dashoffset: 0;
}
.door-line {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: clamp(1.2rem, 2vw, 1.7rem);
    line-height: 1.4;
    letter-spacing: 0.02em;
    color: var(--bone);
}
.door-link-wrap { margin-top: 2vh; }
.door-link {
    font-family: var(--font-micro);
    font-size: 11px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--caliper-grey);
    text-decoration: none;
    border-bottom: 1px solid var(--engraved-line);
    padding-bottom: 4px;
    transition: color 480ms var(--ease-soft), border-color 480ms var(--ease-soft);
}
.door-link:hover {
    color: var(--reading-grey);
    border-bottom-color: var(--caliper-grey);
}
.wordmark {
    margin-top: 14vh;
    font-family: var(--font-micro);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--caliper-grey);
    opacity: 0.5;
}

/* ============================================================
   NEAR LAYER — floating station index (fades in after first scroll)
   ============================================================ */
.station-index {
    position: fixed;
    top: 50%;
    right: clamp(14px, 2.4vw, 34px);
    transform: translateY(-50%) translateX(14px);
    z-index: 20;
    display: flex;
    flex-direction: column;
    gap: 18px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 900ms var(--ease-soft), transform 900ms var(--ease-slow);
}
.station-index.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) translateX(0);
}
.station-index a {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-family: var(--font-micro);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--caliper-grey);
    opacity: 0.5;
    transition: opacity 360ms var(--ease-soft), color 360ms var(--ease-soft);
}
.station-index a:hover { opacity: 1; color: var(--reading-grey); }
.station-index a.active { opacity: 1; color: var(--bone); }
.si-num { min-width: 1.6em; text-align: right; }
.si-tick {
    width: 18px; height: 1px;
    background: var(--engraved-line);
    transition: width 360ms var(--ease-slow), background 360ms var(--ease-soft);
}
.station-index a.active .si-tick { width: 34px; background: var(--caliper-grey); }
@media (max-width: 720px) {
    .station-index { display: none; }
}

/* ============================================================
   NEAR LAYER — thin progress filament + readout (moves slightly faster)
   ============================================================ */
.progress-rail {
    position: fixed;
    left: clamp(10px, 1.6vw, 22px);
    top: 14vh;
    bottom: 14vh;
    width: 1px;
    z-index: 19;
    background: rgba(58,63,70,0.35);
    will-change: transform;
}
.progress-fill {
    position: absolute;
    left: 0; top: 0;
    width: 1px;
    height: 0%;
    background: linear-gradient(var(--caliper-grey), var(--engraved-line));
}
.progress-readout {
    position: absolute;
    left: 8px;
    top: 0;
    transform: translateY(-50%);
    font-family: var(--font-micro);
    font-size: 10px;
    letter-spacing: 0.14em;
    color: var(--caliper-grey);
    opacity: 0.55;
    white-space: nowrap;
}
@media (max-width: 720px) {
    .progress-rail { display: none; }
}

/* ============================================================
   SCROLL-TRIGGERED REVEALS
   ============================================================ */
[data-reveal] {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 620ms var(--ease-slow), transform 620ms var(--ease-slow);
}
[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}
/* panes keep their layout transforms even before reveal — only fade/slide via wrapper-less approach:
   since panes carry their own transforms (frames stagger uses translateY in CSS already),
   reveal additively shifts. To avoid conflict, frame panes reveal via opacity only. */
.pane--frame[data-reveal] { transform: translateY(28px); }
.pane--frame[data-reveal].revealed { transform: translateY(0); }

/* ============================================================
   prefers-reduced-motion : flatten parallax, kill oscillation
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .grid-plane,
    .haze, .haze--1, .haze--2, .haze--3 { animation: none !important; }
    .hint-tick { animation: none; }
    [data-reveal] { opacity: 1; transform: none; transition: none; }
    .pane { transition: none; }
    .beam-path.drawn, .horizon-path.drawn { transition: none; stroke-dashoffset: 0; }
}