/* DDAZZL.com — Isometric Aurora Instrument */

:root {
    --void: #0a0e1a;
    --twilight: #141b2d;
    --steel: #1c2541;
    --frost: #e8edf5;
    --mist: #8b95a8;
    --cyan: #5ce1e6;
    --violet: #7b68ee;
    --rose: #c77dff;
    --ice: #00f5d4;
    --ember: #ff6b6b;

    --iso-rotX: 30deg;
    --iso-rotY: 45deg;

    --font-display: 'Commissioner', 'Inter', system-ui, sans-serif;
    --font-mono: 'Space Mono', 'Space Grotesk', ui-monospace, monospace;
}

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

html, body {
    background: var(--void);
    color: var(--frost);
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100%;
    cursor: none;
}

body {
    position: relative;
    perspective: 1600px;
    perspective-origin: 50% 30%;
}

/* ========== AURORA FIELD ========== */
.aurora-field {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
    background:
        radial-gradient(circle at 20% 10%, rgba(123, 104, 238, 0.12), transparent 55%),
        radial-gradient(circle at 80% 80%, rgba(92, 225, 230, 0.10), transparent 60%),
        linear-gradient(180deg, #0a0e1a 0%, #0c1226 50%, #0a0e1a 100%);
}

.aurora-layer {
    position: absolute;
    inset: -20%;
    mix-blend-mode: screen;
    filter: blur(80px);
    opacity: 0.55;
    transform-origin: center;
}
.aurora-layer--cyan {
    background: radial-gradient(ellipse 60% 30% at 30% 40%, rgba(92, 225, 230, 0.55), transparent 70%);
    animation: drift-h 60s ease-in-out infinite alternate;
}
.aurora-layer--violet {
    background: radial-gradient(ellipse 50% 40% at 70% 60%, rgba(123, 104, 238, 0.55), transparent 70%);
    animation: undulate-v 45s ease-in-out infinite alternate;
}
.aurora-layer--rose {
    background: radial-gradient(ellipse 55% 35% at 50% 50%, rgba(199, 125, 255, 0.40), transparent 70%);
    animation: sweep-d 90s linear infinite;
}

@keyframes drift-h {
    0%   { transform: translate3d(-15%, 5%, 0) scale(1.1); }
    100% { transform: translate3d(15%, -5%, 0) scale(1.2); }
}
@keyframes undulate-v {
    0%   { transform: translate3d(5%, -10%, 0) scale(1.0); }
    100% { transform: translate3d(-5%, 10%, 0) scale(1.15); }
}
@keyframes sweep-d {
    0%   { transform: translate3d(-20%, -20%, 0) rotate(0deg); }
    100% { transform: translate3d(20%, 20%, 0) rotate(360deg); }
}

.noise-overlay {
    position: absolute;
    inset: 0;
    opacity: 0.04;
    mix-blend-mode: overlay;
    background-image:
        repeating-radial-gradient(circle at 23% 47%, rgba(232,237,245,0.6) 0px, rgba(232,237,245,0) 1px, rgba(232,237,245,0) 2px),
        repeating-radial-gradient(circle at 71% 19%, rgba(232,237,245,0.5) 0px, rgba(232,237,245,0) 1px, rgba(232,237,245,0) 3px),
        repeating-radial-gradient(circle at 41% 83%, rgba(232,237,245,0.4) 0px, rgba(232,237,245,0) 1px, rgba(232,237,245,0) 2px);
    pointer-events: none;
}

.blueprint-grid {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.10;
    pointer-events: none;
}

/* ========== MAGNETIC CURSOR ========== */
.cursor {
    position: fixed;
    top: 0; left: 0;
    pointer-events: none;
    z-index: 9999;
    mix-blend-mode: screen;
    transform: translate3d(-100px, -100px, 0);
    transition: opacity 0.3s ease;
}
.cursor__dot {
    position: absolute;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--ice);
    transform: translate(-50%, -50%);
    box-shadow: 0 0 12px var(--cyan);
}
.cursor__ring {
    position: absolute;
    width: 36px; height: 36px;
    border: 1px solid rgba(92, 225, 230, 0.55);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.25s ease, height 0.25s ease, border-color 0.25s ease;
}
.cursor.is-magnetic .cursor__ring {
    width: 64px; height: 64px;
    border-color: var(--ice);
}

/* ========== KICKERS / META ========== */
.kicker {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--mist);
    display: inline-block;
}
.kicker--alt { color: var(--cyan); }

/* ========== NAV ========== */
.iso-nav {
    position: fixed;
    top: 50%;
    left: 28px;
    transform: translateY(-50%) rotateX(0deg) rotateY(0deg);
    z-index: 50;
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding: 24px 14px;
    background: linear-gradient(180deg, rgba(20, 27, 45, 0.55), rgba(10, 14, 26, 0.35));
    border-left: 1px solid rgba(92, 225, 230, 0.25);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transform-origin: left center;
}
.iso-nav__brand {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--frost);
    font-size: 14px;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
}
.iso-nav__list { list-style: none; display: flex; flex-direction: column; gap: 16px; }
.iso-nav__item {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: none;
    color: var(--mist);
    transition: transform 0.4s cubic-bezier(.2,.8,.2,1), color 0.3s ease;
    will-change: transform;
}
.iso-nav__item:hover { color: var(--frost); }
.iso-nav__index {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--cyan);
}
.iso-nav__label {
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0;
    max-width: 0;
    overflow: hidden;
    transition: opacity 0.3s ease, max-width 0.3s ease;
    white-space: nowrap;
}
.iso-nav__item:hover .iso-nav__label,
.iso-nav__item.is-active .iso-nav__label {
    opacity: 1;
    max-width: 120px;
}
.iso-nav__item.is-active { color: var(--ice); }
.iso-nav__meta {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--mist);
    letter-spacing: 0.08em;
}

/* ========== HERO ========== */
.hero {
    position: relative;
    min-height: 100vh;
    padding: 80px 7vw 80px calc(7vw + 80px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    z-index: 2;
}
.hero__meta {
    display: flex;
    gap: 24px;
    align-items: center;
}

.iso-room {
    position: relative;
    flex: 1;
    margin: 60px 0;
    min-height: 60vh;
    transform-style: preserve-3d;
    perspective: 1400px;
    perspective-origin: 50% 50%;
}

.iso-plane {
    position: absolute;
    transform-style: preserve-3d;
    transition: transform 1.2s cubic-bezier(.2,.8,.2,1), opacity 1s ease;
    opacity: 0;
}
.iso-plane.is-set { opacity: 1; }

.iso-plane--floor {
    left: 5%;
    right: 25%;
    bottom: 8%;
    height: 55%;
    transform: rotateX(60deg) rotateZ(-45deg) translateZ(-300px);
    transform-origin: center center;
    background: linear-gradient(135deg, rgba(28, 37, 65, 0.9), rgba(20, 27, 45, 0.65));
    border: 1px solid rgba(92, 225, 230, 0.25);
    box-shadow:
        0 0 60px rgba(92, 225, 230, 0.18),
        inset 0 0 80px rgba(123, 104, 238, 0.10);
    padding: 40px;
    display: flex;
    align-items: flex-end;
}
.iso-plane--floor.is-set {
    transform: rotateX(60deg) rotateZ(-45deg) translateZ(0);
}
.floor-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(0deg, rgba(92, 225, 230, 0.18) 1px, transparent 1px),
        linear-gradient(90deg, rgba(92, 225, 230, 0.18) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    opacity: 0.6;
}

.hero__title {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 0.95;
    font-size: clamp(2.4rem, 6vw, 5.6rem);
    color: var(--frost);
    transform: rotateZ(45deg) rotateX(-60deg);
    transform-origin: bottom left;
    text-shadow: 0 0 40px rgba(92, 225, 230, 0.20);
    font-variation-settings: "wght" 400;
    transition: font-variation-settings 0.6s ease;
}
.hero__title.is-focused { font-variation-settings: "wght" 800; }
.hero__title-line { display: block; }
.hero__title-line:nth-child(2) { color: var(--cyan); }
.hero__title-line:nth-child(3) { color: var(--rose); }

.iso-plane--left {
    left: 0%;
    top: 6%;
    width: 28%;
    height: 70%;
    transform: rotateY(45deg) translateX(-200px);
    transform-origin: right center;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 30px 24px;
    background: linear-gradient(180deg, rgba(20, 27, 45, 0.7), rgba(10, 14, 26, 0.4));
    border: 1px solid rgba(123, 104, 238, 0.25);
    box-shadow: -20px 0 60px rgba(123, 104, 238, 0.12);
}
.iso-plane--left.is-set {
    transform: rotateY(45deg) translateX(0);
}

.iso-cube {
    width: 90px; height: 90px;
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(-30deg) rotateY(45deg);
    margin: 30px auto;
    animation: cube-hover 8s ease-in-out infinite alternate;
}
@keyframes cube-hover {
    0%   { transform: rotateX(-30deg) rotateY(45deg) translateY(0); }
    100% { transform: rotateX(-30deg) rotateY(60deg) translateY(-12px); }
}
.cube-face {
    position: absolute;
    inset: 0;
    border: 1px solid rgba(92, 225, 230, 0.5);
    background: linear-gradient(135deg, rgba(92, 225, 230, 0.12), rgba(123, 104, 238, 0.08));
}
.cube-face--top    { transform: rotateX(90deg) translateZ(45px); background: linear-gradient(135deg, rgba(0,245,212,0.2), rgba(92,225,230,0.1)); }
.cube-face--left   { transform: rotateY(-90deg) translateZ(45px); }
.cube-face--right  { transform: translateZ(45px); }

.iso-caption {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--mist);
    text-align: center;
}

.iso-plane--right {
    right: 0%;
    top: 10%;
    width: 38%;
    height: 70%;
    transform: rotateY(-45deg) translateX(200px);
    transform-origin: left center;
    padding: 40px 30px;
    background: linear-gradient(180deg, rgba(28, 37, 65, 0.7), rgba(20, 27, 45, 0.4));
    border: 1px solid rgba(199, 125, 255, 0.25);
    box-shadow: 20px 0 60px rgba(199, 125, 255, 0.10);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 24px;
}
.iso-plane--right.is-set {
    transform: rotateY(-45deg) translateX(0);
}

.hero__lede {
    font-size: clamp(0.95rem, 1.1vw, 1.15rem);
    color: var(--frost);
    font-weight: 300;
}

.iso-platform {
    position: relative;
    width: 140px;
    height: 60px;
    transform-style: preserve-3d;
    transform: rotateX(60deg) rotateZ(-45deg);
    margin: 0 auto;
}
.platform-top {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(199,125,255,0.25), rgba(92,225,230,0.12));
    border: 1px solid rgba(199, 125, 255, 0.4);
}
.platform-left {
    position: absolute; left: 0; top: 100%; width: 100%; height: 18px;
    transform: rotateX(-90deg);
    transform-origin: top;
    background: linear-gradient(180deg, rgba(123,104,238,0.5), rgba(20,27,45,0.6));
}
.platform-right {
    position: absolute; left: 100%; top: 0; height: 100%; width: 18px;
    transform: rotateY(90deg);
    transform-origin: left;
    background: linear-gradient(90deg, rgba(123,104,238,0.4), rgba(20,27,45,0.6));
}

.hero__scroll-cue {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--mist);
}
.scroll-tick {
    width: 60px; height: 1px;
    background: linear-gradient(90deg, var(--cyan), transparent);
    position: relative;
}
.scroll-tick::after {
    content: "";
    position: absolute;
    top: -3px; left: 0;
    width: 8px; height: 8px;
    background: var(--ice);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--cyan);
    animation: tick-slide 3s ease-in-out infinite;
}
@keyframes tick-slide {
    0%, 100% { transform: translateX(0); opacity: 1; }
    50%      { transform: translateX(50px); opacity: 0.3; }
}

/* ========== CHAPTERS ========== */
.narrative {
    position: relative;
    z-index: 2;
}

.chapter {
    position: relative;
    min-height: 100vh;
    padding: 14vh 7vw 14vh calc(7vw + 80px);
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 40px;
    align-items: start;
}
.chapter__rail {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
    padding-top: 12px;
}
.chapter__index {
    font-family: var(--font-mono);
    font-size: 56px;
    color: var(--cyan);
    line-height: 1;
    letter-spacing: -0.02em;
    text-shadow: 0 0 30px rgba(92, 225, 230, 0.4);
}

.chapter__stage {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
}
.chapter--alt .chapter__stage {
    grid-template-columns: 0.9fr 1.1fr;
}
.chapter__stage--observatory {
    grid-template-columns: 1fr 1fr;
}

.chapter__copy {
    max-width: 480px;
}
.chapter__copy--left { order: -1; }

.chapter__title {
    font-family: var(--font-display);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1;
    font-size: clamp(2rem, 4vw, 3.6rem);
    color: var(--frost);
    margin-bottom: 24px;
    font-variation-settings: "wght" 400;
    transition: font-variation-settings 0.6s ease;
}
.chapter__title.is-focused { font-variation-settings: "wght" 800; }
.chapter__copy p {
    color: var(--mist);
    margin-bottom: 18px;
}

.spec-list {
    list-style: none;
    margin-top: 28px;
    border-top: 1px solid rgba(139, 149, 168, 0.25);
}
.spec-list li {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid rgba(139, 149, 168, 0.18);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.05em;
    color: var(--frost);
}
.spec-list li span {
    color: var(--cyan);
}

/* ========== ISO STACK (strata) ========== */
.iso-stack {
    position: relative;
    height: 480px;
    transform-style: preserve-3d;
    perspective: 1200px;
}
.iso-card {
    position: absolute;
    width: 320px;
    padding: 28px 26px;
    background: linear-gradient(135deg, rgba(28, 37, 65, 0.85), rgba(20, 27, 45, 0.55));
    border: 1px solid rgba(92, 225, 230, 0.30);
    box-shadow:
        0 30px 60px rgba(10, 14, 26, 0.6),
        0 0 30px rgba(92, 225, 230, 0.10);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transform-style: preserve-3d;
    transition: transform 0.5s cubic-bezier(.2,.8,.2,1), border-color 0.4s ease;
    will-change: transform;
}
.iso-card h3 {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.02em;
    color: var(--frost);
    margin: 8px 0 10px;
}
.iso-card p {
    color: var(--mist);
    font-size: 0.95rem;
}
.iso-card--a {
    top: 0; left: 0;
    transform: rotateX(20deg) rotateY(-20deg) translateZ(0);
    border-color: rgba(92, 225, 230, 0.4);
}
.iso-card--b {
    top: 110px; left: 80px;
    transform: rotateX(20deg) rotateY(-20deg) translateZ(40px);
    border-color: rgba(123, 104, 238, 0.4);
}
.iso-card--c {
    top: 220px; left: 160px;
    transform: rotateX(20deg) rotateY(-20deg) translateZ(80px);
    border-color: rgba(199, 125, 255, 0.4);
}

/* ========== STAIRCASE ========== */
.iso-staircase {
    position: relative;
    width: 100%;
    height: 420px;
    transform-style: preserve-3d;
    perspective: 1200px;
}
.step {
    position: absolute;
    width: 180px;
    height: 60px;
    background: linear-gradient(135deg, rgba(28,37,65,0.9), rgba(20,27,45,0.6));
    border: 1px solid rgba(92, 225, 230, 0.35);
    transform-style: preserve-3d;
    transform: rotateX(60deg) rotateZ(-45deg);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 40px rgba(0, 245, 212, 0.10);
    transition: transform 0.5s cubic-bezier(.2,.8,.2,1);
    will-change: transform;
}
.step::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0,245,212,0.10), transparent);
}
.step--1 { top: 220px; left: 30px; }
.step--2 { top: 160px; left: 110px; }
.step--3 { top: 100px; left: 190px; }
.step--4 { top: 40px;  left: 270px; border-color: rgba(199, 125, 255, 0.5); }
.step .kicker { color: var(--ice); position: relative; z-index: 1; }

/* ========== OBSERVATORY ========== */
.iso-observatory {
    position: relative;
    height: 420px;
    transform-style: preserve-3d;
    perspective: 1200px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.dome {
    position: relative;
    width: 200px; height: 100px;
    transform-style: preserve-3d;
    transform: rotateX(60deg) rotateZ(-45deg);
}
.dome__top {
    position: absolute; inset: 0;
    border-radius: 50%;
    background: radial-gradient(ellipse at 50% 30%, rgba(0,245,212,0.6), rgba(92,225,230,0.15) 70%, transparent);
    border: 1px solid rgba(0,245,212,0.5);
    box-shadow: 0 0 60px rgba(0,245,212,0.4);
}
.dome__left, .dome__right {
    position: absolute;
    background: linear-gradient(180deg, rgba(20,27,45,0.9), rgba(10,14,26,0.6));
    border: 1px solid rgba(92,225,230,0.3);
}
.dome__left  { left: 0; top: 100%; width: 100%; height: 30px; transform: rotateX(-90deg); transform-origin: top; }
.dome__right { left: 100%; top: 0; height: 100%; width: 30px; transform: rotateY(90deg); transform-origin: left; }

.readouts {
    position: absolute;
    right: 5%;
    top: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.readout {
    padding: 14px 18px;
    background: linear-gradient(135deg, rgba(20,27,45,0.85), rgba(10,14,26,0.5));
    border: 1px solid rgba(139,149,168,0.25);
    min-width: 110px;
    transition: transform 0.4s cubic-bezier(.2,.8,.2,1), border-color 0.3s ease;
    will-change: transform;
}
.readout:hover { border-color: var(--cyan); }
.readout__value {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.4rem;
    color: var(--frost);
    margin-top: 6px;
    letter-spacing: 0.02em;
}

/* ========== BREATH (hex pulses) ========== */
.breath {
    height: 40vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.hex-pulse {
    width: 240px;
    height: 240px;
    overflow: visible;
}
.hex {
    fill: none;
    stroke: rgba(92, 225, 230, 0.4);
    stroke-width: 1;
    transform-origin: center;
}
.hex--1 { animation: hex-pulse 4s ease-in-out infinite; }
.hex--2 { animation: hex-pulse 4s ease-in-out infinite 0.6s; stroke: rgba(123,104,238,0.4); }
.hex--3 { animation: hex-pulse 4s ease-in-out infinite 1.2s; stroke: rgba(199,125,255,0.4); }
@keyframes hex-pulse {
    0%, 100% { transform: scale(0.8); opacity: 0.3; }
    50%      { transform: scale(1.15); opacity: 1; }
}

/* ========== SIGNAL FORM ========== */
.iso-beacon {
    position: relative;
    height: 380px;
    display: flex;
    align-items: center;
    justify-content: center;
    transform-style: preserve-3d;
    perspective: 1000px;
}
.beacon-ring {
    position: absolute;
    border: 1px solid rgba(0,245,212,0.4);
    border-radius: 50%;
    transform: rotateX(70deg);
    animation: beacon-pulse 5s ease-in-out infinite;
}
.beacon-ring--1 { width: 140px; height: 140px; }
.beacon-ring--2 { width: 220px; height: 220px; animation-delay: 0.8s; border-color: rgba(123,104,238,0.35); }
.beacon-ring--3 { width: 320px; height: 320px; animation-delay: 1.6s; border-color: rgba(199,125,255,0.3); }
@keyframes beacon-pulse {
    0%, 100% { transform: rotateX(70deg) scale(0.95); opacity: 0.35; }
    50%      { transform: rotateX(70deg) scale(1.1); opacity: 1; }
}
.beacon-core {
    width: 60px; height: 60px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--ice), var(--cyan) 60%, transparent 80%);
    box-shadow: 0 0 60px var(--cyan), 0 0 120px rgba(123,104,238,0.4);
    animation: beacon-glow 3s ease-in-out infinite alternate;
}
@keyframes beacon-glow {
    0%   { transform: scale(1); }
    100% { transform: scale(1.15); }
}

.signal-form {
    margin-top: 28px;
    display: grid;
    gap: 18px;
}
.signal-form__row {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.signal-form__row input,
.signal-form__row textarea {
    background: rgba(20, 27, 45, 0.55);
    border: 1px solid rgba(139,149,168,0.3);
    color: var(--frost);
    padding: 12px 14px;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.04em;
    border-radius: 0;
    transition: border-color 0.3s ease, background 0.3s ease;
    cursor: none;
    resize: vertical;
}
.signal-form__row input:hover,
.signal-form__row textarea:hover { border-color: var(--cyan); background: rgba(28,37,65,0.6); }
.signal-form__row input:focus,
.signal-form__row textarea:focus {
    outline: none;
    border-color: var(--ice);
    background: rgba(28,37,65,0.7);
}
.signal-form__send {
    align-self: flex-start;
    background: transparent;
    color: var(--frost);
    border: 1px solid var(--cyan);
    padding: 14px 28px;
    font-family: var(--font-mono);
    font-size: 13px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: none;
    display: inline-flex;
    align-items: center;
    gap: 14px;
    position: relative;
    transition: background 0.3s ease, color 0.3s ease, transform 0.4s cubic-bezier(.2,.8,.2,1);
    overflow: hidden;
    will-change: transform;
}
.signal-form__send::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(92,225,230,0.20), rgba(123,104,238,0.20));
    opacity: 0;
    transition: opacity 0.3s ease;
}
.signal-form__send:hover { background: rgba(92,225,230,0.10); color: var(--ice); border-color: var(--ice); }
.signal-form__send:hover::before { opacity: 1; }
.signal-form__send span { position: relative; }
.send-tick {
    width: 24px; height: 1px;
    background: var(--cyan);
    position: relative;
}
.send-tick::after {
    content: "";
    position: absolute;
    right: -2px; top: -3px;
    border: 4px solid transparent;
    border-left-color: var(--cyan);
}
.signal-form__status {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--ice);
    min-height: 1em;
    letter-spacing: 0.05em;
}

/* ========== SIGNOFF ========== */
.signoff {
    padding: 14vh 7vw 80px calc(7vw + 80px);
    position: relative;
}
.signoff__rule {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(92,225,230,0.6), transparent);
    margin-bottom: 60px;
}
.signoff__cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
}
.signoff__cols p {
    color: var(--mist);
    margin-top: 10px;
    font-size: 0.95rem;
}
.signoff__mark {
    display: block;
    margin-top: 60px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--ember);
    opacity: 0.7;
}
#sessionClock {
    font-family: var(--font-mono);
    color: var(--cyan);
}

/* ========== REVEAL STATES ========== */
.reveal {
    opacity: 0;
    transform: translate3d(0, 30px, 0);
    transition: opacity 0.9s ease, transform 0.9s cubic-bezier(.2,.8,.2,1);
}
.reveal.is-visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 960px) {
    body { cursor: auto; }
    .cursor { display: none; }
    .iso-nav { left: 8px; padding: 14px 8px; gap: 18px; }
    .iso-nav__brand { font-size: 11px; }
    .hero { padding: 60px 6vw 60px 60px; }
    .iso-room { min-height: 70vh; }
    .iso-plane--floor { left: 0; right: 5%; }
    .iso-plane--left  { width: 32%; }
    .iso-plane--right { width: 50%; }
    .chapter { grid-template-columns: 50px 1fr; padding: 10vh 6vw 10vh 60px; }
    .chapter__index { font-size: 36px; }
    .chapter__stage,
    .chapter--alt .chapter__stage,
    .chapter__stage--observatory {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .chapter__copy--left { order: 0; }
    .iso-stack { height: 420px; }
    .iso-card { width: 86%; }
    .iso-card--a { left: 0; }
    .iso-card--b { left: 7%; }
    .iso-card--c { left: 14%; }
    .signoff__cols { grid-template-columns: 1fr; gap: 30px; }
    .signoff { padding: 10vh 6vw 60px 60px; }
    .readouts { position: static; margin-top: 30px; }
}

@media (max-width: 540px) {
    .iso-nav__list { gap: 10px; }
    .hero__title { font-size: clamp(2rem, 9vw, 3rem); }
    .iso-plane--floor { transform: rotateX(50deg) rotateZ(-30deg); }
    .iso-plane--left  { transform: rotateY(30deg); width: 38%; }
    .iso-plane--right { transform: rotateY(-30deg); width: 60%; }
}