:root {
    --bg: #161616;
    --surface: #1d1d1d;
    --elevated: #252525;
    --soft: #202028;
    --text: #fff;
    --muted: #b3b3c5;
    --neutral: #a7a7a7;
    --accent: #572ffe;
    --accent-soft: #8f74ff;
    --success: #3ddc97;
    --error: #ff6b7a;
    --border: rgba(255, 255, 255, .1);
    --border-subtle: rgba(255, 255, 255, .06);
    --ease: cubic-bezier(.16, 1, .3, 1);
    --sans: 'Montserrat', system-ui, sans-serif;
    --mono: SFMono-Regular, Consolas, Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); }
body { color: var(--text); font-family: var(--sans); -webkit-font-smoothing: antialiased; overflow: hidden; }
button, a { font: inherit; }
button { color: inherit; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent-soft); outline-offset: 3px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.ui-icon { display: block; width: 18px; height: 18px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.machine-grid {
    position: fixed; inset: 0; pointer-events: none; opacity: .38;
    background-image: linear-gradient(rgba(255,255,255,.022) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.022) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: linear-gradient(90deg, #000, transparent 72%);
}
.machine-grid::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 90% 55%, rgba(87,47,254,.075), transparent 27%); }

.experience { position: relative; width: 100%; min-height: 100dvh; overflow: hidden; }
.topbar { position: fixed; left: 0; right: 0; z-index: 4; display: flex; align-items: center; justify-content: space-between; padding-inline: clamp(1rem, 3vw, 3rem); background: rgba(22,22,22,.97); }
.topbar { top: 0; height: 70px; border-bottom: 1px solid var(--border); }
.brand { display: inline-flex; align-items: center; }
.brand img { width: 112px; height: auto; display: block; }
.topbar__navigation { display: flex; align-items: center; gap: clamp(.8rem, 2vw, 1.5rem); }
.back-button { display: inline-flex; align-items: center; gap: .55rem; min-height: 34px; padding: .35rem .65rem; border: 1px solid var(--border); border-radius: 6px; background: transparent; color: var(--muted); font-size: .72rem; cursor: pointer; transition: color 160ms var(--ease), background 160ms var(--ease), border-color 160ms var(--ease), transform 120ms var(--ease); }
.back-button:hover { color: var(--text); border-color: rgba(255,255,255,.18); background: rgba(255,255,255,.035); }
.back-button:active { transform: scale(.97); }
.back-button[hidden] { display: none; }
.step-counter { color: var(--muted); font: 500 .66rem/1 var(--mono); letter-spacing: .05em; }
.step-counter span { color: var(--text); }
.progress-track { position: fixed; top: 69px; left: 0; right: 0; z-index: 5; height: 2px; background: rgba(255,255,255,.035); }
.progress-value { display: block; width: 100%; height: 100%; background: var(--accent); transform: scaleX(.2); transform-origin: left; transition: transform 500ms var(--ease); }

.screen { position: fixed; inset: 72px 0 0; display: none; overflow-y: auto; overscroll-behavior: contain; opacity: 0; transform: translate3d(18px, 0, 0); }
.screen.is-active { display: block; opacity: 1; transform: none; transition: opacity 400ms var(--ease), transform 400ms var(--ease); }
.screen.is-entering { opacity: 0; transform: translate3d(18px, 0, 0); }
.screen.is-leaving { display: block; opacity: 0; transform: translate3d(-12px, 0, 0); transition: opacity 260ms var(--ease), transform 260ms var(--ease); }
.screen.is-entering-back { transform: translate3d(-18px, 0, 0); }
.screen.is-leaving.is-leaving-back { transform: translate3d(12px, 0, 0); }
.screen__content { position: relative; width: min(100%, 1280px); min-height: 100%; margin: 0 auto; padding: clamp(2rem, 6vh, 5.5rem) clamp(1rem, 5vw, 4.5rem); }

.eyebrow { margin: 0 0 1.2rem; color: var(--accent-soft); font: 600 .68rem/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
h1, h2 { margin: 0; color: var(--text); letter-spacing: -.045em; }
h1 { max-width: 13ch; font-size: clamp(2.65rem, 6.5vw, 6.6rem); line-height: .94; }
h2 { max-width: 18ch; font-size: clamp(2.1rem, 4.6vw, 4.8rem); line-height: .98; }
.lead { margin: 1.5rem 0 0; color: var(--muted); font-size: clamp(1rem, 1.7vw, 1.25rem); line-height: 1.55; }

.primary-action { display: inline-flex; align-items: center; justify-content: space-between; gap: 1.2rem; min-width: 280px; min-height: 48px; padding: .45rem .48rem .45rem 1.05rem; border: 1px solid rgba(255,255,255,.14); border-radius: 8px; background: var(--accent); color: var(--text); font-size: .82rem; font-weight: 600; cursor: pointer; transition: background 170ms var(--ease), border-color 170ms var(--ease), transform 120ms var(--ease); }
.primary-action:hover { background: #4625e0; border-color: rgba(255,255,255,.22); }
.primary-action:active { transform: scale(.98); }
.action-icon { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 6px; background: rgba(255,255,255,.13); transition: transform 180ms var(--ease), background 180ms var(--ease); }
.action-icon .ui-icon { width: 17px; height: 17px; }
.primary-action:hover .action-icon { transform: translateX(2px); background: rgba(255,255,255,.19); }

/* Intro */
.screen__content--intro { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(230px, .5fr); grid-template-rows: 1fr auto; align-items: center; gap: 2rem 6vw; }
.system-readout { position: absolute; top: 2rem; right: clamp(1rem, 5vw, 4.5rem); width: min(31vw, 370px); border-top: 1px solid var(--border); padding-top: .7rem; color: var(--neutral); font: .67rem/1.7 var(--mono); }
.system-readout__label { float: right; color: var(--accent-soft); }
.terminal-lines { display: grid; }
.terminal-lines span { opacity: 0; animation: terminal-line 280ms var(--ease) calc(100ms + var(--line) * 230ms) forwards; }
.terminal-lines .terminal-result { color: var(--error); }
.intro-copy { align-self: center; }
.scoreboard { align-self: center; margin: 3rem 0 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.scoreboard div { display: flex; align-items: baseline; justify-content: space-between; gap: 2rem; padding: 1rem .25rem; border-top: 1px solid var(--border-subtle); }
.scoreboard div:first-child { border-top: 0; }
.scoreboard dt { color: var(--neutral); font: 500 .68rem/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; }
.scoreboard dd { margin: 0; font: 600 1.7rem/1 var(--mono); }
.scoreboard__zero { color: var(--error); }
.screen__content--intro > .primary-action { align-self: end; justify-self: start; }
.reveal-group { opacity: 0; transform: translateY(10px); animation: intro-reveal 520ms var(--ease) .8s forwards; }
.scoreboard.reveal-group { animation-delay: .88s; }
.primary-action.reveal-group { animation-delay: .96s; }

/* Question */
.screen__content--question { display: grid; grid-template-columns: minmax(300px, .82fr) minmax(390px, 1.18fr); align-items: center; gap: 7vw; padding-top: max(5rem, 9vh); }
.question-copy { padding-top: 2rem; }
.question-copy h2 { max-width: 14ch; }
.prompt { max-width: 22ch; margin: clamp(2rem, 5vh, 4rem) 0 0; color: var(--text); font-size: clamp(1.15rem, 2vw, 1.55rem); font-weight: 600; line-height: 1.25; }
.choice-list { border-top: 1px solid var(--border); }
.choice { width: 100%; display: grid; grid-template-columns: 36px 1fr 28px; align-items: center; gap: 1rem; min-height: 76px; padding: .85rem 1rem; border: 0; border-bottom: 1px solid var(--border); background: transparent; text-align: left; cursor: pointer; transition: background 160ms var(--ease), color 160ms var(--ease); }
.choice:hover { background: rgba(255,255,255,.04); }
.choice:active { background: var(--soft); }
.choice__code { color: var(--neutral); font: .72rem/1 var(--mono); }
.choice > span:nth-child(2) { font-size: clamp(.9rem, 1.6vw, 1.08rem); font-weight: 500; line-height: 1.4; }
.choice__arrow { color: var(--muted); transform: translate3d(0, 0, 0); transition: transform 180ms var(--ease), color 180ms var(--ease); }
.choice:hover .choice__arrow { color: var(--text); transform: translate3d(3px, -3px, 0); }

/* Dynamic response */
.screen__content--response { display: grid; grid-template-columns: minmax(0, 820px); grid-template-rows: 1fr auto; align-items: center; align-content: center; gap: 2rem; padding-top: max(5.2rem, 10vh); }
.screen__content--response > .primary-action { justify-self: start; }
.diagnostic-stamp { position: absolute; top: 3rem; right: clamp(1rem, 5vw, 4.5rem); display: flex; align-items: center; gap: .55rem; color: var(--success); font: 500 .65rem/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; }
.diagnostic-stamp__mark { width: 8px; height: 8px; border: 1px solid var(--success); border-radius: 2px; background: rgba(61,220,151,.16); }
.response-copy { max-width: 780px; }
.response-copy h2 { max-width: 19ch; }
.response-body { max-width: 55ch; margin-top: 2rem; color: var(--muted); font-size: clamp(.93rem, 1.5vw, 1.07rem); line-height: 1.7; }
.response-body p { margin: .8rem 0; }
.response-body strong { color: var(--text); }
.response-body ul { display: flex; flex-wrap: wrap; gap: .45rem; margin: 1.2rem 0; padding: 0; list-style: none; }
.response-body li { padding: .35rem .6rem; border: 1px solid var(--border); border-radius: 4px; color: var(--neutral); font: .73rem/1.2 var(--mono); }
.response-body .response-punchline { margin-top: 1.5rem; padding-left: 1rem; border-left: 2px solid var(--accent); color: var(--text); font-weight: 600; }
.response-question { color: var(--text); font-size: 1.15em; font-weight: 600; }

/* Brand reveal */
.screen__content--reveal { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(350px, .85fr); grid-template-rows: 1fr auto; align-items: center; gap: 2rem 8vw; padding-top: max(5.2rem, 9vh); }
.reveal-heading h2 { max-width: 18ch; }
.reveal-heading h2 span { color: var(--accent-soft); }
.not-slide { margin: 1.4rem 0 0; color: var(--text); font-size: 1rem; font-weight: 600; }
.capability-list { border-top: 1px solid var(--border); }
.capability-list div { display: grid; grid-template-columns: 34px 1fr; gap: 1rem; align-items: baseline; padding: .8rem .2rem; border-bottom: 1px solid var(--border); }
.capability-list span { color: var(--accent-soft); font: .63rem/1 var(--mono); }
.capability-list p { margin: 0; color: var(--muted); font-size: .86rem; font-weight: 500; line-height: 1.35; }
blockquote { display: flex; align-items: center; gap: 1rem; margin: 0; color: var(--text); }
blockquote img { width: 36px; height: 36px; object-fit: contain; }
blockquote p { margin: 0; font-size: clamp(1rem, 1.8vw, 1.3rem); font-weight: 600; line-height: 1.15; letter-spacing: -.02em; }
.screen__content--reveal > .primary-action { justify-self: end; }

/* Handoff */
.screen__content--handoff { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(310px, .72fr); grid-template-rows: auto 1fr auto; align-items: start; gap: 1.6rem 7vw; padding-top: max(5rem, 8vh); }
.screen__content--handoff.is-fallback { grid-template-columns: 1fr; grid-template-rows: 1fr; align-items: center; }
.handoff-copy { grid-column: 1; }
.handoff-copy h2 { max-width: 17ch; font-size: clamp(2rem, 4vw, 4.25rem); }
.human-line { margin: 1.2rem 0 0; color: var(--accent-soft); font-size: clamp(1rem, 1.7vw, 1.3rem); font-weight: 600; }
.diagnosis-panel { grid-column: 2; grid-row: 1 / span 2; align-self: center; padding: 1.1rem; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.diagnosis-panel__top { display: flex; justify-content: space-between; padding-bottom: .9rem; border-bottom: 1px solid var(--border-subtle); color: var(--neutral); font: .65rem/1 var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.diagnosis-status { color: var(--success); }
.diagnosis-status i { display: inline-block; width: 5px; height: 5px; margin-right: .25rem; border-radius: 50%; background: var(--success); }
.diagnosis-panel strong { display: block; margin: 1.2rem 0 .55rem; color: var(--text); font-size: clamp(1.15rem, 2vw, 1.45rem); line-height: 1.2; }
.diagnosis-panel p { margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.55; }
.instruction { grid-column: 1; align-self: end; }
.instruction > p { margin: .4rem 0; color: var(--muted); font-size: .82rem; }
.instruction > strong { display: inline-block; margin: .2rem 0 .5rem; font: 700 clamp(1.65rem, 3vw, 2.8rem)/1 var(--sans); letter-spacing: -.04em; }
.phrase { display: flex; align-items: center; gap: .7rem; width: max-content; max-width: 100%; margin: .8rem 0; padding: .85rem 1rem; border-left: 2px solid var(--accent); background: rgba(87,47,254,.08); color: var(--text); font-size: clamp(.9rem, 1.5vw, 1.05rem); font-weight: 600; }
.inline-emoji { display: inline-block; white-space: nowrap; font-family: 'Segoe UI Emoji', 'Apple Color Emoji', sans-serif; font-size: .82em; font-weight: 400; line-height: 1; letter-spacing: 0; vertical-align: .06em; }
.instruction small { color: var(--neutral); font-size: .72rem; }
.final-actions { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; padding-top: .2rem; }
.secondary-action { display: inline-flex; align-items: center; justify-content: space-between; gap: 1.5rem; min-height: 42px; padding: .55rem .75rem .55rem .9rem; border: 1px solid var(--border); border-radius: 7px; background: rgba(255,255,255,.025); color: var(--text); font-size: .78rem; font-weight: 500; cursor: pointer; transition: background 160ms var(--ease), border-color 160ms var(--ease), transform 120ms var(--ease); }
.final-actions .secondary-action { width: 230px; }
.secondary-action:hover { background: rgba(255,255,255,.05); border-color: rgba(255,255,255,.19); }
.secondary-action:active { transform: scale(.98); }
.secondary-action .ui-icon { width: 16px; height: 16px; color: var(--neutral); transition: color 160ms var(--ease), transform 180ms var(--ease); }
.secondary-action:hover .ui-icon { color: var(--text); transform: translateX(2px); }
.is-dismissed { pointer-events: none; opacity: 0; transform: translateY(-8px); transition: opacity 220ms var(--ease), transform 220ms var(--ease); }
.fallback-card { grid-column: 1 / -1; width: min(100%, 840px); align-self: center; justify-self: center; padding: clamp(1.3rem, 3vw, 2.2rem); border: 1px solid var(--border); border-radius: 8px; background: var(--surface); text-align: left; opacity: 0; transform: translateY(10px); }
.fallback-card.is-visible { opacity: 1; transform: none; transition: opacity 380ms var(--ease), transform 380ms var(--ease); }
.fallback-card h2 { max-width: 22ch; font-size: clamp(1.7rem, 4vw, 3.25rem); }
.show-this { margin: 0 0 1rem; color: var(--muted); font-size: clamp(.9rem, 1.5vw, 1.05rem); }
.handoff-command { margin: 1.3rem 0 0; color: var(--accent-soft); font-weight: 600; }
.contact-card > p:not(.eyebrow) { max-width: 48ch; margin: 1.2rem 0 1.5rem; color: var(--muted); font-size: .9rem; line-height: 1.6; }
.contact-links { display: grid; border-top: 1px solid var(--border); }
.contact-links a { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem .2rem; border-bottom: 1px solid var(--border); color: var(--text); font-size: .85rem; font-weight: 600; text-decoration: none; transition: padding 180ms var(--ease), background 180ms var(--ease); }
.contact-links a:hover { padding-inline: .65rem; background: rgba(255,255,255,.035); }
.contact-links a .ui-icon { color: var(--accent-soft); transition: transform 180ms var(--ease); }
.contact-links a:hover .ui-icon { transform: translate(2px, -2px); }

@keyframes terminal-line { to { opacity: 1; } }
@keyframes intro-reveal { to { opacity: 1; transform: none; } }

@media (max-width: 760px) {
    .topbar { height: 62px; }.progress-track { top: 61px; }.brand img { width: 99px; }
    .screen { inset: 64px 0 0; }
    .screen__content { min-height: auto; padding: 4.5rem 1rem 2rem; }
    h1 { font-size: clamp(2.45rem, 12vw, 4rem); } h2 { font-size: clamp(2rem, 9.5vw, 3.25rem); }
    .question-copy h2 { font-size: clamp(1.9rem, 8.45vw, 3rem); }
    .primary-action { width: 100%; min-width: 0; }
    .screen__content--intro, .screen__content--question, .screen__content--response, .screen__content--reveal, .screen__content--handoff { display: grid; grid-template-columns: 1fr; grid-template-rows: auto; gap: 2rem; align-content: center; }
    .screen__content--intro { padding-top: 7.5rem; align-content: start; }
    .system-readout { top: 1.5rem; left: 1rem; right: 1rem; width: auto; }
    .scoreboard { display: grid; grid-template-columns: 1fr 1fr; margin: 0; }.scoreboard div { display: grid; gap: .8rem; }.scoreboard div + div { border-top: 0; border-left: 1px solid var(--border); padding-left: 1rem; }
    .screen__content--intro > .primary-action { align-self: auto; justify-self: stretch; }
    .screen__content--question { align-content: start; }.question-copy { padding-top: 0; }.prompt { margin-top: 1.8rem; }.choice { min-height: 65px; padding-inline: .65rem; grid-template-columns: 24px 1fr 20px; gap: .7rem; }
    .screen__content--response { align-content: start; }.diagnostic-stamp { top: 1.2rem; right: 1rem; }.screen__content--response > .primary-action { order: 4; }
    .screen__content--reveal { align-content: start; }.capability-list div { padding-block: .68rem; }.screen__content--reveal > .primary-action { justify-self: stretch; }
    blockquote { padding: .8rem 0; border-top: 1px solid var(--border-subtle); }
    .screen__content--handoff { align-content: start; }.handoff-copy, .diagnosis-panel, .instruction, .final-actions, .fallback-card { grid-column: 1; grid-row: auto; }.diagnosis-panel { align-self: auto; }.final-actions { flex-direction: column; align-items: stretch; gap: .35rem; }.final-actions .secondary-action { width: 100%; }
}

@media (max-height: 720px) and (min-width: 761px) {
    .screen__content { padding-top: 4rem; padding-bottom: 2rem; }
    h1 { font-size: clamp(3rem, 6vw, 5rem); } h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
    .choice { min-height: 62px; }.capability-list div { padding-block: .57rem; }.response-body { margin-top: 1.3rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
    .reveal-group, .terminal-lines span { opacity: 1; transform: none; }
}