/* =========================================================
   sora.day — Gilded Atmospheric Archive
   ========================================================= */

:root {
    /* Gilded Atmospherics Palette */
    --dawn-wash:       #F5E6D0;
    --morning-gold:    #C9A84C;
    --zenith-white:    #FFF8F0;
    --dusk-copper:     #D4856A;
    --night-indigo:    #1A1040;
    --night-indigo-l:  #1a1040;
    --text-dark:       #3D3229;
    --text-light:      #E8DFD2;
    --ornament-bronze: #A89070;
    --collage-rose:    #E0A899;
    --collage-amber:   #D9B86C;
    --ripple-gold:     #F0D078;
    --star-silver:     #C8C0D8;

    --ripple-color:    var(--ripple-gold);

    /* Fonts */
    --font-display: "Poiret One", "Cormorant Garamond", serif;
    --font-body:    "Cormorant Garamond", Georgia, serif;
    --font-accent:  "Josefin Sans", "Inter", sans-serif;
}

/* ---------- reset / base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    color: var(--text-dark);
    background: var(--night-indigo);
    overflow-x: hidden;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

button { font-family: inherit; border: none; background: none; padding: 0; cursor: pointer; color: inherit; }

/* ---------- sky canvas (fixed background gradients) ---------- */
.sky-canvas {
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
}
.sky-layer {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 1.2s ease;
}
.sky-layer.active { opacity: 1; }

.sky-vestibule {
    background:
        linear-gradient(180deg, #1A1040 0%, #2a1f55 30%, #6b3a5c 60%, #b87864 80%, #F5E6D0 100%);
}
.sky-dawn {
    background:
        radial-gradient(1200px 800px at 50% 90%, #F5E6D0 0%, #E8C8A0 40%, #C9A099 80%, #6b3a5c 100%),
        linear-gradient(180deg, #6b3a5c 0%, #C9A099 40%, #F5E6D0 100%);
    background-blend-mode: normal;
}
.sky-morning {
    background: linear-gradient(180deg, #F5E6D0 0%, #E8CC8A 35%, #C9A84C 70%, #B89640 100%);
}
.sky-zenith {
    background:
        radial-gradient(1400px 900px at 50% 0%, #FFF8F0 0%, #F8EFE0 50%, #ECDDC4 100%);
}
.sky-dusk {
    background: linear-gradient(180deg, #C9A84C 0%, #D4856A 40%, #A85D5C 75%, #5a2e58 100%);
}
.sky-night {
    background: linear-gradient(180deg, #5a2e58 0%, #2a1f55 35%, #1A1040 100%);
}

/* ---------- ripple stage ---------- */
.ripple-stage {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    overflow: hidden;
}
.ripple {
    position: absolute;
    border-radius: 50%;
    border: 1.5px solid var(--ripple-color);
    transform: translate(-50%, -50%) scale(0);
    pointer-events: none;
    opacity: 0.45;
}
.ripple.run {
    animation: rippleExpand 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes rippleExpand {
    0%   { transform: translate(-50%, -50%) scale(0);   opacity: 0.45; }
    50%  {                                              opacity: 0.30; }
    100% { transform: translate(-50%, -50%) scale(1);   opacity: 0;    }
}

/* ---------- particle field ---------- */
.particle-field {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    opacity: 0;
    transition: opacity 1.5s ease;
}
.particle-field.visible { opacity: 1; }
.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--star-silver) 0%, rgba(200,192,216,0) 70%);
    animation: drift linear infinite, pulseStar ease-in-out infinite alternate;
}
@keyframes drift {
    0%   { transform: translate(0, 0); }
    50%  { transform: translate(40px, -30px); }
    100% { transform: translate(-30px, 40px); }
}
@keyframes pulseStar {
    0%   { opacity: 0.3; transform: scale(1); }
    100% { opacity: 0.75; transform: scale(1.3); }
}

/* ---------- diamond rail ---------- */
.rail {
    position: fixed;
    top: 0;
    left: 28px;
    width: 28px;
    height: 100vh;
    z-index: 100;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1.4s ease 1.6s;
}
.rail.shown { opacity: 1; }
.rail-line {
    position: absolute;
    top: 6%;
    bottom: 6%;
    left: 50%;
    width: 1px;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        rgba(168,144,112,0.5) 12%,
        rgba(168,144,112,0.5) 88%,
        transparent 100%
    );
    /* notch decoration via repeating background */
    background-image:
        linear-gradient(to bottom, rgba(168,144,112,0.5), rgba(168,144,112,0.5)),
        repeating-linear-gradient(
            to bottom,
            rgba(168,144,112,0.6) 0px,
            rgba(168,144,112,0.6) 1px,
            transparent 1px,
            transparent 14px
        );
    background-size: 1px 100%, 5px 100%;
    background-position: center, center;
    background-repeat: no-repeat, repeat-y;
    transform: translateX(-50%);
}
.rail-diamond {
    position: absolute;
    left: 50%;
    width: 12px;
    height: 12px;
    transform: translate(-50%, -50%) rotate(45deg);
    border: 1px solid var(--ornament-bronze);
    background: transparent;
    pointer-events: auto;
    transition: background 0.5s ease, border-color 0.4s ease, box-shadow 0.4s ease;
    cursor: pointer;
}
.rail-diamond.active {
    background: linear-gradient(135deg, var(--ripple-gold) 0%, var(--morning-gold) 100%);
    border-color: var(--morning-gold);
    box-shadow: 0 0 14px rgba(240,208,120,0.5);
}
.rail-diamond.passed {
    background: linear-gradient(135deg, var(--ornament-bronze) 0%, var(--morning-gold) 100%);
}
.rail-diamond:hover { box-shadow: 0 0 12px rgba(168,144,112,0.7); }

.rail-tooltip {
    position: absolute;
    left: 22px;
    top: 50%;
    transform: translateY(-50%) rotate(-45deg);
    transform-origin: left center;
    font-family: var(--font-accent);
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--ornament-bronze);
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}
.rail-diamond:hover .rail-tooltip,
.rail-diamond.active .rail-tooltip {
    opacity: 0.9;
}

/* ---------- document/main ---------- */
.document {
    position: relative;
    z-index: 1;
}

/* ---------- chambers ---------- */
.chamber {
    position: relative;
    min-height: 100vh;
    width: 100%;
    padding: 12vh 8vw 12vh 12vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    overflow: hidden;
}
.chamber-inner {
    position: relative;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 32px;
    width: 100%;
    max-width: 1500px;
    margin: 0 auto;
}

/* Chamber header */
.chamber-header {
    position: relative;
    padding: 40px 0 60px;
    grid-column: 1 / -1;
    text-align: center;
}
.chamber-header[data-side="left"]   { text-align: left;   padding-left: 20px; }
.chamber-header[data-side="right"]  { text-align: right;  padding-right: 20px; }
.chamber-header[data-side="center"] { text-align: center; }

.chamber-label {
    display: inline-block;
    font-family: var(--font-accent);
    font-weight: 300;
    font-size: clamp(0.7rem, 1vw, 0.85rem);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--ornament-bronze);
    margin-bottom: 16px;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.chamber-title {
    position: relative;
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(3.5rem, 10vw, 9rem);
    letter-spacing: 0.15em;
    line-height: 1.1;
    text-transform: uppercase;
    margin: 0;
    color: var(--text-dark);
    clip-path: inset(0 0 100% 0);
    transition: clip-path 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.2s,
                color 1.5s ease;
}
.chamber.in-view .chamber-label { opacity: 1; transform: translateY(0); }
.chamber.in-view .chamber-title { clip-path: inset(0 0 0 0); }

/* Per-chamber title color */
.chamber-dawn    .chamber-title { color: #B8965A; }
.chamber-morning .chamber-title { color: var(--morning-gold); }
.chamber-zenith  .chamber-title { color: #5C4A36; }
.chamber-dusk    .chamber-title { color: var(--text-dark); }
.chamber-night   .chamber-title { color: var(--star-silver); }

/* Fluted columns flanking heading */
.fluted-flank {
    position: absolute;
    top: 30%;
    bottom: 10%;
    width: 16px;
    background-image: repeating-linear-gradient(
        90deg,
        var(--ornament-bronze) 0px,
        var(--ornament-bronze) 1px,
        transparent 1px,
        transparent 5px
    );
    opacity: 0.35;
    pointer-events: none;
}
.fluted-left  { left: -40px; }
.fluted-right { right: -40px; }
.chamber-header[data-side="center"] .fluted-left  { left: calc(50% - 220px); }
.chamber-header[data-side="center"] .fluted-right { right: calc(50% - 220px); }

/* ---------- content frame (deco border) ---------- */
.content-frame {
    position: relative;
    padding: 64px 56px 56px;
    margin: 0 auto;
    border: 1px solid rgba(168,144,112,0.35);
    background: rgba(245,230,208,0.06);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 1s ease, transform 1s ease;
    transition-delay: 0.2s;
}
.chamber.in-view .content-frame { opacity: 1; transform: translateY(0); }

.col-2-4 { grid-column: 2 / span 3; }
.col-3-5 { grid-column: 3 / span 3; }

@media (max-width: 900px) {
    .col-2-4, .col-3-5 { grid-column: 1 / -1; }
    .chamber { padding: 12vh 6vw 12vh 60px; }
}

/* Frame corners — three-stepped L brackets */
.frame-corner {
    position: absolute;
    width: 36px;
    height: 36px;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.7s ease, transform 0.7s ease;
}
.chamber.in-view .frame-corner { opacity: 1; transform: translate(0,0); }
.frame-corner::before,
.frame-corner::after {
    content: "";
    position: absolute;
    background: var(--ornament-bronze);
    opacity: 0.7;
}
/* Top-left */
.frame-corner.tl { top: -1px; left: -1px; transform: translate(-12px, -12px); }
.frame-corner.tl::before { top: 0; left: 0; width: 36px; height: 1px; }
.frame-corner.tl::after  { top: 0; left: 0; width: 1px; height: 36px; }
/* nested step shapes via box-shadow on a child – use second pair */
.frame-corner.tl, .frame-corner.tr, .frame-corner.bl, .frame-corner.br {
    background:
        linear-gradient(to right, var(--ornament-bronze) 0 22px, transparent 22px 100%) top left/100% 1px no-repeat,
        linear-gradient(to bottom, var(--ornament-bronze) 0 22px, transparent 22px 100%) top left/1px 100% no-repeat,
        linear-gradient(to right, var(--ornament-bronze) 0 14px, transparent 14px 100%) 6px 6px/100% 1px no-repeat,
        linear-gradient(to bottom, var(--ornament-bronze) 0 14px, transparent 14px 100%) 6px 6px/1px 100% no-repeat,
        linear-gradient(to right, var(--ornament-bronze) 0 8px, transparent 8px 100%) 12px 12px/100% 1px no-repeat,
        linear-gradient(to bottom, var(--ornament-bronze) 0 8px, transparent 8px 100%) 12px 12px/1px 100% no-repeat;
    opacity: 0.75;
}
.frame-corner.tl::before, .frame-corner.tl::after,
.frame-corner.tr::before, .frame-corner.tr::after,
.frame-corner.bl::before, .frame-corner.bl::after,
.frame-corner.br::before, .frame-corner.br::after { display: none; }

.frame-corner.tr {
    top: -1px; right: -1px;
    transform: translate(12px, -12px) scaleX(-1);
}
.frame-corner.bl {
    bottom: -1px; left: -1px;
    transform: translate(-12px, 12px) scaleY(-1);
}
.frame-corner.br {
    bottom: -1px; right: -1px;
    transform: translate(12px, 12px) scale(-1, -1);
}
.chamber.in-view .frame-corner.tl { transform: translate(0,0); }
.chamber.in-view .frame-corner.tr { transform: translate(0,0) scaleX(-1); }
.chamber.in-view .frame-corner.bl { transform: translate(0,0) scaleY(-1); }
.chamber.in-view .frame-corner.br { transform: translate(0,0) scale(-1,-1); }

/* Sunburst fan at frame top */
.frame-fan {
    position: absolute;
    top: -32px;
    left: 50%;
    width: 120px;
    height: 60px;
    transform: translateX(-50%);
    pointer-events: none;
}
.frame-fan line, .frame-fan path {
    stroke: var(--ornament-bronze);
    stroke-width: 1;
    fill: none;
    opacity: 0.6;
    transform-origin: 60px 60px;
    transform: rotate(0deg);
    transition: transform 0.9s ease, opacity 0.9s ease;
}
.frame-fan line {
    stroke-dasharray: 60;
    stroke-dashoffset: 60;
    transition: stroke-dashoffset 0.9s ease 0.3s, opacity 0.9s ease;
}
.chamber.in-view .frame-fan line { stroke-dashoffset: 0; }
.frame-fan path { stroke-width: 0.8; }

/* Block typography */
.block-heading {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.6rem, 3vw, 2.6rem);
    letter-spacing: 0.12em;
    line-height: 1.2;
    text-transform: uppercase;
    margin: 0 0 24px;
    color: var(--text-dark);
}
.block-body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.4vw, 1.18rem);
    line-height: 1.75;
    letter-spacing: 0.02em;
    color: var(--text-dark);
    margin: 0 0 24px;
}

/* Mini chevron divider */
.mini-chevron {
    width: 60%;
    height: 8px;
    margin: 28px auto 28px;
    background-image: repeating-linear-gradient(
        135deg,
        var(--ornament-bronze) 0px,
        var(--ornament-bronze) 1px,
        transparent 1px,
        transparent 6px
    ),
    repeating-linear-gradient(
        45deg,
        var(--ornament-bronze) 0px,
        var(--ornament-bronze) 1px,
        transparent 1px,
        transparent 6px
    );
    opacity: 0.4;
    background-size: 12px 100%, 12px 100%;
    background-repeat: repeat-x, repeat-x;
}

/* Ornament cluster (stepped ziggurat shapes) */
.ornament-cluster {
    grid-column: span 2;
    align-self: center;
    position: relative;
    height: 220px;
    opacity: 0;
    transition: opacity 1s ease 0.4s;
}
.chamber.in-view .ornament-cluster { opacity: 1; }
.ornament-cluster[data-side="left"]  { grid-column: 1 / span 1; justify-self: start; }
.ornament-cluster[data-side="right"] { grid-column: 6 / span 1; justify-self: end; }
.stepped-shape {
    position: absolute;
    border: 1px solid var(--ornament-bronze);
    background: rgba(168,144,112,0.06);
    opacity: 0.5;
}
.stepped-shape.step-1 { width: 90px; height: 90px; left: 0; top: 0; }
.stepped-shape.step-2 { width: 70px; height: 70px; left: 20px; top: 50px; }
.stepped-shape.step-3 { width: 50px; height: 50px; left: 40px; top: 90px; }

/* ---------- chevron rules (used in vestibule) ---------- */
.chevron-rule {
    width: 280px;
    height: 12px;
    margin: 18px auto;
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 1s ease 1.3s;
}
.chevron-rule.draw { transform: scaleX(1); }
.chevron-rule svg {
    width: 100%;
    height: 100%;
    stroke: var(--ripple-gold);
    stroke-width: 1.4;
    fill: none;
    opacity: 0.7;
}

/* ============= VESTIBULE ============= */
.chamber-vestibule {
    min-height: 100vh;
    padding: 0;
    align-items: center;
    justify-content: center;
}
.vestibule-frame {
    position: relative;
    width: min(1100px, 86vw);
    margin: 0 auto;
    text-align: center;
    padding: 80px 40px;
}
.deco-sunburst {
    position: absolute;
    width: 300px;
    height: 150px;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 1.6s ease 1s;
}
.deco-sunburst.shown { opacity: 0.7; }
.deco-sunburst line {
    stroke: var(--ripple-gold);
    stroke-width: 1.2;
    fill: none;
    transform-origin: 100px 100px;
}
.deco-sunburst path {
    stroke: var(--ripple-gold);
    stroke-width: 1.4;
    fill: none;
}

.title-sora {
    position: relative;
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(5rem, 18vw, 16rem);
    letter-spacing: 0.18em;
    line-height: 1;
    text-transform: uppercase;
    color: var(--dawn-wash);
    margin: 60px 0 30px;
    display: flex;
    justify-content: center;
    gap: 0.05em;
}
.title-sora .ch {
    position: relative;
    display: inline-block;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.7s ease, transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}
.title-sora .ch.shown { opacity: 1; transform: translateY(0); }
.title-sora .ch-glyph {
    position: relative;
    z-index: 2;
    color: var(--dawn-wash);
    text-shadow: 0 0 30px rgba(245,230,208,0.25);
}
/* hairline stroke bisecting each character */
.title-sora .ch-bar {
    position: absolute;
    top: 8%;
    bottom: 8%;
    left: 50%;
    width: 1px;
    background: var(--morning-gold);
    transform-origin: top;
    transform: translateX(-50%) scaleY(0);
    transition: transform 1s ease 1.6s;
    opacity: 0.55;
    z-index: 3;
}
.title-sora .ch.shown .ch-bar { transform: translateX(-50%) scaleY(1); }

.title-day {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.4rem, 3.5vw, 2.6rem);
    letter-spacing: 0.6em;
    text-transform: uppercase;
    color: var(--dawn-wash);
    margin: 0 0 0 0.6em;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.9s ease 1.2s, transform 0.9s ease 1.2s;
}
.title-day.shown { opacity: 0.9; transform: translateY(0); }

.vestibule-caption {
    margin-top: 50px;
    font-family: var(--font-accent);
    font-weight: 300;
    font-size: clamp(0.75rem, 1.1vw, 0.95rem);
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--ornament-bronze);
    opacity: 0;
    transition: opacity 1s ease 2.2s;
}
.vestibule-caption.shown { opacity: 0.85; }

.scroll-cue {
    margin-top: 80px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    font-family: var(--font-accent);
    font-weight: 300;
    font-size: 0.7rem;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--ornament-bronze);
    opacity: 0;
    transition: opacity 1.2s ease 2.6s;
}
.scroll-cue.shown { opacity: 0.7; }
.scroll-cue-line {
    display: block;
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--ornament-bronze), transparent);
    animation: scrollPulse 2.4s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%, 100% { transform: scaleY(0.4); transform-origin: top; opacity: 0.5; }
    50%      { transform: scaleY(1);   transform-origin: top; opacity: 1; }
}

/* ============= COLLAGE STRIPS ============= */
.collage-strip {
    position: relative;
    width: 100%;
    height: 260px;
    overflow: hidden;
    pointer-events: none;
}
.cshape {
    position: absolute;
    left: var(--x);
    top: var(--y);
    background: var(--c, var(--collage-rose));
    opacity: var(--o, 0.5);
    transform: translate(-50%, -50%) translateY(var(--ty, 0px));
    pointer-events: auto;
    transition: transform 0.4s ease, filter 0.4s ease;
    will-change: transform;
}
.cshape.c-circle {
    width: var(--s, 100px);
    height: var(--s, 100px);
    border-radius: 50%;
    mix-blend-mode: multiply;
}
.cshape.c-rect {
    width: var(--w, 100px);
    height: var(--h, 60px);
    border: 1px solid rgba(61,50,41,0.3);
    mix-blend-mode: multiply;
}
.cshape.c-tri {
    width: 0;
    height: 0;
    border-left: calc(var(--s, 100px) / 2) solid transparent;
    border-right: calc(var(--s, 100px) / 2) solid transparent;
    border-bottom: var(--s, 100px) solid var(--c, var(--collage-rose));
    background: transparent;
    mix-blend-mode: screen;
}
.cshape:hover { filter: brightness(1.08); transform: translate(-50%, -50%) translateY(var(--ty, 0px)) scale(1.08); }

/* ============= CIRCUIT UNDERLAY ============= */
.circuit-underlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}
.circuit-underlay svg {
    width: 100%;
    height: 100%;
    display: block;
}
.circuit-lines path {
    fill: none;
    stroke: var(--text-dark);
    stroke-width: 1;
    opacity: 0.05;
}
.circuit-lines circle {
    fill: var(--text-dark);
    opacity: 0.06;
}
.chamber-night .circuit-lines path,
.chamber-night .circuit-lines circle {
    stroke: var(--star-silver);
    fill: var(--star-silver);
    opacity: 0.08;
}

.chamber-inner { z-index: 1; }
.chamber-header { z-index: 2; }
.content-frame { z-index: 2; }

/* ============= NIGHT CHAMBER ============= */
.chamber-night {
    color: var(--text-light);
}
.chamber-night .chamber-label  { color: var(--star-silver); opacity: 0.7; }
.chamber-night .block-heading  { color: var(--star-silver); }
.chamber-night .block-body     { color: var(--text-light); }
.chamber-night .content-frame  {
    background: rgba(26,16,64,0.35);
    border-color: rgba(200,192,216,0.25);
}
.chamber-night .frame-corner {
    background:
        linear-gradient(to right, var(--star-silver) 0 22px, transparent 22px 100%) top left/100% 1px no-repeat,
        linear-gradient(to bottom, var(--star-silver) 0 22px, transparent 22px 100%) top left/1px 100% no-repeat,
        linear-gradient(to right, var(--star-silver) 0 14px, transparent 14px 100%) 6px 6px/100% 1px no-repeat,
        linear-gradient(to bottom, var(--star-silver) 0 14px, transparent 14px 100%) 6px 6px/1px 100% no-repeat,
        linear-gradient(to right, var(--star-silver) 0 8px, transparent 8px 100%) 12px 12px/100% 1px no-repeat,
        linear-gradient(to bottom, var(--star-silver) 0 8px, transparent 8px 100%) 12px 12px/1px 100% no-repeat;
    opacity: 0.55;
}
.chamber-night .frame-fan line,
.chamber-night .frame-fan path {
    stroke: var(--star-silver);
    opacity: 0.55;
}
.chamber-night .mini-chevron {
    background-image: repeating-linear-gradient(
        135deg,
        var(--star-silver) 0 1px, transparent 1px 6px
    ),
    repeating-linear-gradient(
        45deg,
        var(--star-silver) 0 1px, transparent 1px 6px
    );
    opacity: 0.4;
}
.chamber-night .fluted-flank {
    background-image: repeating-linear-gradient(
        90deg,
        var(--star-silver) 0px,
        var(--star-silver) 1px,
        transparent 1px,
        transparent 5px
    );
    opacity: 0.3;
}

/* ---------- coda ---------- */
.coda {
    position: relative;
    margin: 14vh auto 8vh;
    text-align: center;
    grid-column: 1 / -1;
}
.coda-text {
    font-family: var(--font-accent);
    font-weight: 300;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    letter-spacing: 0.4em;
    color: var(--star-silver);
    margin: 0;
    opacity: 0.85;
}
.coda-dot {
    position: relative;
    display: inline-block;
    width: 0.5em;
    text-align: center;
    color: var(--ripple-gold);
}
.coda-dot::before,
.coda-dot::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 6px;
    border: 1px solid var(--ripple-gold);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0.6;
    pointer-events: none;
    animation: codaRipple 4s ease-out infinite;
}
.coda-dot::after { animation-delay: 2s; }
@keyframes codaRipple {
    0%   { transform: translate(-50%, -50%) scale(0.5); opacity: 0.6; }
    100% { transform: translate(-50%, -50%) scale(8);   opacity: 0;   }
}
.coda-sub {
    margin-top: 18px;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 0.95rem;
    color: rgba(200,192,216,0.55);
    letter-spacing: 0.04em;
}

/* ---------- responsive tweaks ---------- */
@media (max-width: 700px) {
    .rail { left: 14px; width: 22px; }
    .rail-tooltip { display: none; }
    .vestibule-frame { padding: 60px 20px; }
    .ornament-cluster { display: none; }
    .chamber-header[data-side="center"] .fluted-left,
    .chamber-header[data-side="center"] .fluted-right { display: none; }
    .fluted-flank { display: none; }
    .content-frame { padding: 48px 28px 36px; }
    .chamber { padding: 14vh 6vw 14vh 50px; }
    .collage-strip { height: 200px; }
}