/* relativity.studio — kinetic typography performance
   Palette: Stage Black #1A0A2E, Spotlight White #F0E6FF, Lavender Mist #D4C8E8,
            Dusk Violet #8B7AA0, Stage Red #FF3366, Cyclorama Purple #2D1A4E,
            Follow Spot Violet #6B4D8A, Warm Gel #FFB366
   Fonts: Bebas Neue (display), Source Sans 3 (body), Overpass Mono (metadata)
*/

:root {
    --stage-black: #1A0A2E;
    --spotlight-white: #F0E6FF;
    --lavender-mist: #D4C8E8;
    --dusk-violet: #8B7AA0;
    --stage-red: #FF3366;
    --cyclorama: #2D1A4E;
    --follow-spot: #6B4D8A;
    --warm-gel: #FFB366;

    --sidebar-width: 40%;
    --stage-pad: 7vw;

    --font-display: "Bebas Neue", "Inter", "Arial Narrow", sans-serif;
    --font-body: "Source Sans 3", "Inter", "Helvetica Neue", sans-serif;
    --font-mono: "Overpass Mono", "Inter", "Courier New", monospace;
}

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

html, body {
    background-color: var(--stage-black);
    color: var(--lavender-mist);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.75;
    overflow-x: hidden;
}

body {
    min-height: 100vh;
}

/* ── Proscenium curtain line (vertical 2px Stage Red between sidebar and stage) */
.proscenium {
    position: fixed;
    top: 0;
    bottom: 0;
    left: var(--sidebar-width);
    width: 2px;
    background: var(--stage-red);
    z-index: 50;
    box-shadow: 0 0 24px rgba(255, 51, 102, 0.35);
}

/* ── Sidebar — The Director's Notes ─────────────────────────────────────── */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--stage-black);
    border-right: 1px solid var(--cyclorama);
    z-index: 40;
    overflow: hidden;
}

.sidebar-vertical-title {
    position: absolute;
    left: 22px;
    top: 50%;
    transform: translate(-50%, -50%) rotate(-90deg);
    transform-origin: center;
    font-family: var(--font-mono);
    font-size: 14px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--dusk-violet);
    white-space: nowrap;
}

.sidebar-inner {
    position: relative;
    height: 100%;
    padding: 56px 64px 48px 96px;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    margin-bottom: 56px;
}

.brand-mark {
    font-family: var(--font-display);
    font-size: 56px;
    line-height: 0.9;
    letter-spacing: 0.04em;
    color: var(--spotlight-white);
}

.brand-meta {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--dusk-violet);
    margin-top: 14px;
}

/* Acts navigation */
.acts-nav {
    flex: 1 0 auto;
    margin-bottom: 32px;
}

.acts-label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.32em;
    text-transform: uppercase;
    color: var(--dusk-violet);
    margin-bottom: 24px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--cyclorama);
}

.acts-list {
    list-style: none;
}

.act-item {
    display: flex;
    align-items: baseline;
    gap: 18px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(45, 26, 78, 0.6);
    cursor: pointer;
    transition: color 0.4s ease;
    color: var(--dusk-violet);
}

.act-item:hover {
    color: var(--follow-spot);
}

.act-numeral {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    width: 32px;
    flex-shrink: 0;
    color: inherit;
    transition: color 0.4s ease;
}

.act-name {
    font-family: var(--font-display);
    font-size: 32px;
    line-height: 1;
    letter-spacing: 0;
    text-transform: uppercase;
    color: var(--lavender-mist);
    transition: letter-spacing 0.6s ease-in-out, color 0.6s ease-in-out;
    display: inline-block;
}

.act-item.is-active {
    color: var(--stage-red);
}

.act-item.is-active .act-numeral {
    color: var(--stage-red);
}

.act-item.is-active .act-name {
    letter-spacing: 0.5em;
    color: var(--spotlight-white);
}

.sidebar-coords {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 18px;
    padding: 18px 0;
    border-top: 1px solid var(--cyclorama);
    border-bottom: 1px solid var(--cyclorama);
    margin-bottom: 24px;
}

.coord-row {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.04em;
    color: var(--dusk-violet);
}

.coord-key {
    color: var(--dusk-violet);
}

.coord-val {
    color: var(--lavender-mist);
}

.sidebar-footer {
    flex-shrink: 0;
}

.timestamp-label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--dusk-violet);
    margin-bottom: 8px;
    text-transform: uppercase;
}

.timestamp {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 22px;
    letter-spacing: 0.06em;
    color: var(--warm-gel);
    margin-bottom: 14px;
}

.rehearsal {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.28em;
    color: var(--stage-red);
    text-transform: uppercase;
    position: relative;
    padding-left: 18px;
}

.rehearsal::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 8px;
    height: 8px;
    background: var(--stage-red);
    border-radius: 50%;
    transform: translateY(-50%);
    animation: pulseDot 1.6s ease-in-out infinite;
    box-shadow: 0 0 12px var(--stage-red);
}

@keyframes pulseDot {
    0%, 100% { opacity: 1; transform: translateY(-50%) scale(1); }
    50% { opacity: 0.35; transform: translateY(-50%) scale(0.7); }
}

/* ── Stage — performance area ───────────────────────────────────────────── */
.stage {
    margin-left: var(--sidebar-width);
    width: 60%;
    position: relative;
    background: var(--stage-black);
}

.grid-floor {
    position: fixed;
    top: 0;
    bottom: 0;
    left: var(--sidebar-width);
    right: 0;
    pointer-events: none;
    z-index: 1;
    background-image:
        linear-gradient(to right, rgba(45, 26, 78, 0.55) 0.5px, transparent 0.5px),
        linear-gradient(to bottom, rgba(45, 26, 78, 0.55) 0.5px, transparent 0.5px);
    background-size: 40px 40px;
    background-position: 0 0;
}

.act {
    position: relative;
    min-height: 100vh;
    padding: 14vh var(--stage-pad);
    z-index: 2;
}

.act-marker {
    position: absolute;
    top: 50%;
    right: -6vw;
    transform: translateY(-50%);
    font-family: var(--font-display);
    font-size: clamp(180px, 22vw, 320px);
    line-height: 0.8;
    color: var(--cyclorama);
    opacity: 0.5;
    letter-spacing: 0.02em;
    pointer-events: none;
    z-index: 1;
}

.act-header {
    margin-bottom: 64px;
    max-width: 540px;
    position: relative;
    z-index: 3;
}

.act-label {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.32em;
    color: var(--stage-red);
    text-transform: uppercase;
    margin-bottom: 18px;
}

.act-title {
    font-family: var(--font-display);
    font-size: clamp(56px, 7vw, 112px);
    line-height: 0.95;
    color: var(--spotlight-white);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin-bottom: 24px;
}

.act-direction {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.75;
    color: var(--lavender-mist);
    max-width: 460px;
}

/* ── Prologue ───────────────────────────────────────────────────────────── */
.act-prologue {
    padding-top: 18vh;
    padding-bottom: 12vh;
}

.prologue-body {
    max-width: 640px;
    position: relative;
    z-index: 3;
}

.prologue-meta {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.32em;
    color: var(--dusk-violet);
    margin-bottom: 36px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--cyclorama);
    text-transform: uppercase;
}

.prologue-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(72px, 11vw, 168px);
    line-height: 0.92;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    color: var(--spotlight-white);
    margin-bottom: 56px;
}

.title-line {
    display: block;
}

.title-line-em {
    color: var(--lavender-mist);
    letter-spacing: 0.08em;
    padding-left: 1.6em;
}

.title-line-accent {
    color: var(--stage-red);
    letter-spacing: 0.18em;
    padding-left: 0.4em;
}

.prologue-lede {
    font-size: 18px;
    line-height: 1.7;
    color: var(--lavender-mist);
    max-width: 560px;
    margin-bottom: 64px;
}

.prologue-cue {
    display: inline-flex;
    align-items: center;
    gap: 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--warm-gel);
    text-transform: uppercase;
}

.cue-tick {
    width: 28px;
    height: 1px;
    background: var(--warm-gel);
}

/* ── Act I — Mass ───────────────────────────────────────────────────────── */
.act-mass {
    background: linear-gradient(180deg, transparent 0%, rgba(45, 26, 78, 0.18) 100%);
}

.mass-stage {
    position: relative;
    padding: 60px 0 80px;
    z-index: 3;
}

.mass-word {
    font-family: var(--font-display);
    font-size: clamp(140px, 22vw, 240px);
    line-height: 1;
    color: var(--spotlight-white);
    letter-spacing: 0.04em;
    display: flex;
    align-items: flex-end;
    gap: 0.04em;
}

.mass-letter {
    display: inline-block;
    font-weight: var(--w, 400);
    transform: translateY(0);
    transition: transform 1.2s cubic-bezier(0.22, 1, 0.36, 1), color 1.2s ease;
    will-change: transform;
}

/* When the act is active, sink heavier letters lower */
.act-mass.is-active .mass-letter[data-weight="200"] { transform: translateY(-46px); color: var(--lavender-mist); }
.act-mass.is-active .mass-letter[data-weight="400"] { transform: translateY(-12px); color: var(--lavender-mist); }
.act-mass.is-active .mass-letter[data-weight="700"] { transform: translateY(18px); color: var(--spotlight-white); }
.act-mass.is-active .mass-letter[data-weight="900"] { transform: translateY(58px); color: var(--stage-red); }

.mass-baseline {
    height: 1px;
    background: var(--cyclorama);
    margin-top: 80px;
    position: relative;
}

.mass-baseline::after {
    content: "BASELINE 0.0";
    position: absolute;
    right: 0;
    top: -22px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.24em;
    color: var(--dusk-violet);
}

.mass-annotation {
    display: inline-flex;
    align-items: center;
    gap: 18px;
    margin-top: 36px;
}

.annotation-line {
    width: 64px;
    height: 1px;
    background: var(--warm-gel);
}

.annotation-text {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--warm-gel);
    text-transform: uppercase;
}

.act-readout {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--cyclorama);
    border: 1px solid var(--cyclorama);
    margin-top: 32px;
    max-width: 640px;
}

.readout-row {
    background: var(--stage-black);
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-direction: column;
    gap: 6px;
}

.readout-key {
    font-family: var(--font-display);
    font-size: 28px;
    color: var(--spotlight-white);
    line-height: 1;
}

.readout-val {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--dusk-violet);
    text-transform: uppercase;
}

/* ── Act II — Velocity ──────────────────────────────────────────────────── */
.act-velocity {
    min-height: 140vh;
}

.velocity-stage {
    padding: 40px 0 60px;
    position: relative;
    z-index: 3;
    overflow: visible;
}

.velocity-paragraph {
    font-family: var(--font-body);
    font-size: clamp(20px, 2.4vw, 30px);
    line-height: 1.6;
    color: var(--lavender-mist);
    max-width: 760px;
    word-spacing: 0.1em;
}

.velocity-paragraph .v-word {
    display: inline-block;
    transition: transform 0.18s linear, color 0.6s ease;
    will-change: transform;
    transform: translateX(var(--shear, 0));
}

.velocity-paragraph .v-word.v-emph {
    color: var(--stage-red);
}

.velocity-paragraph .v-word.v-warm {
    color: var(--warm-gel);
}

.velocity-meta {
    display: flex;
    gap: 56px;
    border-top: 1px solid var(--cyclorama);
    padding-top: 24px;
    margin-top: 32px;
}

.meta-block {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.meta-key {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.28em;
    color: var(--dusk-violet);
    text-transform: uppercase;
}

.meta-val {
    font-family: var(--font-mono);
    font-size: 16px;
    color: var(--spotlight-white);
    letter-spacing: 0.04em;
}

/* ── Act III — Acceleration ─────────────────────────────────────────────── */
.act-acceleration {
    background: linear-gradient(180deg, transparent 0%, rgba(45, 26, 78, 0.22) 60%, transparent 100%);
}

.acceleration-stack {
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 40px 0 60px;
    position: relative;
    z-index: 3;
}

.accel-line {
    font-family: var(--font-display);
    text-transform: uppercase;
    color: var(--lavender-mist);
    line-height: 1;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.act-acceleration.is-active .accel-line {
    opacity: 1;
    transform: translateY(0);
}

.act-acceleration.is-active .accel-1 { transition-delay: 0.0s; }
.act-acceleration.is-active .accel-2 { transition-delay: 0.4s; }
.act-acceleration.is-active .accel-3 { transition-delay: 0.8s; }
.act-acceleration.is-active .accel-4 { transition-delay: 1.2s; }
.act-acceleration.is-active .accel-5 { transition-delay: 1.6s; }

.accel-1 { font-size: 14px; font-weight: 300; letter-spacing: 0.4em; color: var(--dusk-violet); }
.accel-2 { font-size: 18px; font-weight: 400; letter-spacing: 0.32em; color: var(--lavender-mist); }
.accel-3 { font-size: 24px; font-weight: 400; letter-spacing: 0.22em; color: var(--lavender-mist); }
.accel-4 { font-size: 36px; font-weight: 500; letter-spacing: 0.12em; color: var(--spotlight-white); }
.accel-5 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--stage-red);
}

.accel-1, .accel-2, .accel-3 {
    font-family: var(--font-body);
}

.accel-4, .accel-5 {
    font-family: var(--font-display);
    font-size: clamp(36px, 5vw, 56px);
}

.accel-5 {
    font-size: clamp(56px, 9vw, 120px);
}

.acceleration-axis {
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--cyclorama);
    padding-top: 18px;
    max-width: 720px;
}

.axis-tick {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--dusk-violet);
}

/* ── Act IV — Curvature ─────────────────────────────────────────────────── */
.act-curvature {
    min-height: 140vh;
}

.curvature-stage {
    position: relative;
    padding: 40px 0 80px;
    z-index: 3;
    min-height: 80vh;
}

.curvature-mass {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 320px;
    pointer-events: none;
    z-index: 1;
}

.mass-orbit {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 1px dashed rgba(139, 122, 160, 0.35);
    animation: spin 60s linear infinite;
}

.mass-orbit-2 {
    inset: 30px;
    border-color: rgba(255, 51, 102, 0.25);
    animation-duration: 40s;
    animation-direction: reverse;
}

.mass-core {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle at 30% 30%, var(--stage-red), var(--cyclorama) 60%, transparent 75%);
    box-shadow: 0 0 60px rgba(255, 51, 102, 0.4), inset -10px -10px 30px rgba(26, 10, 46, 0.6);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.curvature-shape {
    float: left;
    width: 320px;
    height: 320px;
    margin: 40px 40px 40px 0;
    shape-outside: circle(160px at 160px 160px);
    -webkit-shape-outside: circle(160px at 160px 160px);
    visibility: hidden;
}

.curvature-text {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.85;
    color: var(--lavender-mist);
    text-align: justify;
    position: relative;
    z-index: 2;
}

.curvature-text::first-letter {
    font-family: var(--font-display);
    font-size: 84px;
    line-height: 0.9;
    float: left;
    padding: 6px 14px 0 0;
    color: var(--stage-red);
}

/* ── Act V — Equivalence ────────────────────────────────────────────────── */
.act-equivalence {
    min-height: 110vh;
    padding-bottom: 20vh;
}

.equivalence-stage {
    position: relative;
    height: 60vh;
    min-height: 480px;
    z-index: 3;
    margin-top: 40px;
    border: 1px solid var(--cyclorama);
    background: rgba(45, 26, 78, 0.12);
}

.equation {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.04em;
}

.eq-letter {
    position: absolute;
    font-family: var(--font-display);
    font-size: clamp(96px, 16vw, 200px);
    line-height: 0.9;
    color: var(--spotlight-white);
    transition: transform 3s cubic-bezier(0.25, 0.1, 0.25, 1), opacity 1.6s ease;
    transform: translate(var(--rx, 0px), var(--ry, 0px)) rotate(var(--rr, 0deg));
    opacity: 0.55;
    will-change: transform, opacity;
}

.eq-letter.eq-op {
    color: var(--stage-red);
}

.eq-letter.eq-sup {
    color: var(--warm-gel);
    font-size: clamp(48px, 8vw, 110px);
    align-self: flex-start;
}

.eq-letter.is-resolved {
    opacity: 1;
}

.equivalence-caption {
    position: absolute;
    bottom: 24px;
    left: 24px;
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--dusk-violet);
    text-transform: uppercase;
    z-index: 4;
}

.caption-line {
    width: 32px;
    height: 1px;
    background: var(--warm-gel);
}

.equivalence-coda {
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid var(--cyclorama);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--dusk-violet);
    text-transform: uppercase;
}

.coda-button {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.32em;
    color: var(--stage-red);
    background: transparent;
    border: 1px solid var(--stage-red);
    padding: 14px 22px;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.4s ease, color 0.4s ease, letter-spacing 0.4s ease;
}

.coda-button:hover {
    background: var(--stage-red);
    color: var(--stage-black);
    letter-spacing: 0.4em;
}

/* ── Footer ─────────────────────────────────────────────────────────────── */
.stage-footer {
    padding: 80px var(--stage-pad) 64px;
    border-top: 1px solid var(--cyclorama);
    background: var(--stage-black);
    position: relative;
    z-index: 2;
}

.footer-line {
    height: 1px;
    background: linear-gradient(90deg, var(--stage-red) 0%, var(--cyclorama) 30%, transparent 100%);
    margin-bottom: 48px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 24px;
    margin-bottom: 56px;
}

.footer-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-key {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.32em;
    color: var(--dusk-violet);
    text-transform: uppercase;
}

.footer-val {
    font-family: var(--font-display);
    font-size: 22px;
    color: var(--spotlight-white);
    letter-spacing: 0.04em;
}

.footer-tagline {
    font-family: var(--font-display);
    font-size: clamp(36px, 5vw, 64px);
    line-height: 1;
    color: var(--lavender-mist);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/* ── Responsive: collapse sidebar on narrow viewports ───────────────────── */
@media (max-width: 900px) {
    :root {
        --sidebar-width: 100%;
    }

    .sidebar {
        position: relative;
        height: auto;
        border-right: none;
        border-bottom: 2px solid var(--stage-red);
    }

    .sidebar-vertical-title {
        display: none;
    }

    .sidebar-inner {
        padding: 32px 24px;
    }

    .proscenium {
        display: none;
    }

    .stage {
        margin-left: 0;
        width: 100%;
    }

    .grid-floor {
        left: 0;
    }

    .acts-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0 16px;
    }

    .act {
        padding: 8vh 6vw;
    }

    .act-marker {
        right: -10vw;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}