/* Home's editorial structure. Load last; existing product demonstrations retain
   their own styles. No global token or protected-room styling is changed. */
:root {
    --one-page-content-width: 1120px;
    --one-page-gutter: 24px;
    --one-page-nav-height: 76px;
    --one-page-nav-offset: 76px;
}

html:has(body.one-page) {
    scroll-padding-top: calc(var(--one-page-nav-offset) + 16px);
}

body.one-page {
    background: var(--merak-cream);
    color: var(--merak-text-primary);
    font-family: "Hanken Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 17px;
    line-height: 1.6;
}

.one-page *, .one-page *::before, .one-page *::after { box-sizing: border-box; }
.one-page main { min-width: 0; }
.one-page main [id] { scroll-margin-top: 16px; }
.one-page .anchor-alias { display: block; height: 0; margin: 0; padding: 0; }
.one-page .container { width: min(calc(100% - 2 * var(--one-page-gutter)), var(--one-page-content-width)); }

.one-page :where(a, button, summary, [tabindex]):focus-visible {
    outline: 2px solid var(--merak-action-primary);
    outline-offset: 5px;
}

.one-page .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.one-page .skip-link {
    position: fixed;
    z-index: 100;
    inset-block-start: 10px;
    inset-inline-start: var(--one-page-gutter);
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    border-radius: 6px;
    background: var(--merak-action-primary);
    color: var(--merak-on-action-text);
    font-size: 16px;
    font-weight: 700;
    transform: translateY(calc(-100% - 24px));
}
.one-page .skip-link:focus { transform: translateY(0); }

/* A single persistent row provides both orientation and investor access. */
.one-page .site-nav {
    position: sticky;
    inset-block-start: 0;
    z-index: 40;
    min-height: var(--one-page-nav-height);
    padding-inline: var(--one-page-gutter);
    background: var(--merak-cream);
    border-bottom: 1px solid var(--merak-warm-border);
}
.one-page .site-nav__inner {
    width: 100%;
    max-width: var(--one-page-content-width);
    min-height: var(--one-page-nav-height);
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: 30px;
}
.one-page .site-nav .merak-brand { flex-shrink: 0; min-height: 44px; align-items: center; }
.one-page .site-nav__chapters {
    display: flex;
    align-items: center;
    gap: 28px;
    margin-inline-start: auto;
}
.one-page .site-nav__chapters a,
.one-page .site-nav__investor,
.one-page .site-menu summary {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    color: var(--merak-text-primary);
    font: 700 14px/1.3 "Hanken Grotesk", sans-serif;
    white-space: nowrap;
    text-decoration: none;
}
.one-page .site-nav__chapters a { position: relative; padding-block: 12px; }
.one-page .site-nav__chapters a::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: 5px;
    height: 1px;
    background: var(--merak-action-primary);
    transform: scaleX(0);
    transform-origin: left;
}
.one-page .site-nav__chapters a:hover,
.one-page .site-nav__chapters a[aria-current="location"],
.one-page .site-nav__chapters a[aria-current="true"] { color: var(--merak-action-primary); }
.one-page .site-nav__chapters a[aria-current="location"]::after,
.one-page .site-nav__chapters a[aria-current="true"]::after { transform: scaleX(1); }
.one-page .site-nav__investor {
    flex-shrink: 0;
    padding-inline-start: 26px;
    border-inline-start: 1px solid var(--merak-warm-border);
    color: var(--merak-action-primary);
}
.one-page .site-nav__investor:hover { text-decoration: underline; text-underline-offset: 5px; }
.one-page .site-menu { display: none; position: relative; }
.one-page .site-menu summary { cursor: pointer; gap: 10px; list-style: none; }
.one-page .site-menu summary::-webkit-details-marker { display: none; }
.one-page .site-menu summary::after {
    content: "";
    width: 6px;
    height: 6px;
    margin-block-start: -3px;
    border-inline-end: 1.5px solid currentColor;
    border-block-end: 1.5px solid currentColor;
    transform: rotate(45deg);
}
.one-page .site-menu[open] summary::after { margin-block-start: 3px; transform: rotate(225deg); }
.one-page .site-menu__links {
    position: absolute;
    inset-block-start: calc(100% + 10px);
    inset-inline-end: 0;
    width: min(260px, calc(100vw - 32px));
    display: grid;
    gap: 2px;
    padding: 10px;
    border: 1px solid var(--merak-warm-border);
    border-radius: 8px;
    background: var(--merak-surface);
    box-shadow: 0 14px 36px color-mix(in srgb, var(--merak-deep-ink) 12%, transparent);
}
.one-page .site-menu:not([open]) .site-menu__links { display: none; }
.one-page .site-menu__links a {
    display: flex;
    align-items: center;
    min-height: 46px;
    padding: 10px 14px;
    border-radius: 4px;
    color: var(--merak-text-primary);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
}
.one-page .site-menu__links a:hover { background: var(--merak-mist); }

/* One outer measure, a repeated chapter header, and generous ordinary flow. */
.one-page .hero { padding: 80px var(--one-page-gutter) 88px; }
.one-page .hero .hero-inner { width: 100%; max-width: var(--one-page-content-width); gap: 56px 64px; }
.one-page .hero h1 { font-size: clamp(44px, 5.1vw, 64px); line-height: 1.06; }
.one-page .hero .lede { font-size: 19px; line-height: 1.65; }
.one-page .hero-category { font-size: 14px; }
.one-page .hero-disclosure { max-width: 60ch; font-size: 15px; line-height: 1.6; }
.one-page .hero-tease { font-size: 15px; line-height: 1.6; }

.one-page .chapter,
.one-page .assistant-studio.chapter {
    padding: 96px var(--one-page-gutter);
    border-top: 1px solid var(--merak-warm-border);
}
.one-page .chapter__shell,
.one-page .assistant-studio.chapter .assistant-studio__inner {
    width: 100%;
    max-width: var(--one-page-content-width);
    margin-inline: auto;
    min-width: 0;
}
.one-page .chapter .container { width: 100%; max-width: var(--one-page-content-width); }
.one-page .chapter-header {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 64px;
    margin: 0 0 48px;
    text-align: left;
}
.one-page .chapter-header > * { min-width: 0; }
.one-page .chapter-eyebrow {
    margin: 0 0 18px;
    color: var(--merak-action-primary);
    font: 800 14px/1.4 "Hanken Grotesk", sans-serif;
    letter-spacing: .08em;
    text-transform: uppercase;
}
/* Plain status labels precede every roadmap-only feature heading. */
.one-page .feature-stage {
    display: table;
    width: fit-content;
    margin: 0 0 14px;
    padding: 5px 12px;
    border: 1px solid currentColor;
    border-radius: 999px;
    color: var(--merak-action-primary);
    background: transparent;
    font: 700 16px/1.35 "Hanken Grotesk", sans-serif;
    letter-spacing: .01em;
}
.one-page .chapter--lab .feature-stage { color: var(--merak-ink-accent); }
.one-page .format-teaser__top { display: block; }
.one-page .format-teaser__top .feature-stage { margin-bottom: 12px; }
.one-page .catalogue-note .feature-stage { margin-bottom: 12px; }

.one-page .chapter-header h2 {
    max-width: 18ch;
    margin: 0;
    color: var(--merak-text-primary);
    font: 500 clamp(36px, 3.8vw, 48px)/1.12 "Newsreader", Georgia, serif;
    letter-spacing: -.55px;
    text-wrap: balance;
}
.one-page .chapter-header__intro { padding-block-start: 36px; }
.one-page .chapter-header__intro p {
    max-width: 58ch;
    margin: 0;
    color: var(--merak-text-body);
    font-size: 18px;
    line-height: 1.7;
}
.one-page .chapter-header__intro p + p { margin-block-start: 14px; }
.one-page .chapter-header__intro strong { color: var(--merak-text-primary); font-weight: 700; }

/* Current product: subsections inherit the shell, rather than adding gutters. */
.one-page #product { background: var(--merak-surface); }
.one-page #product .example-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
}
.one-page .catalogue-note {
    max-width: 74ch;
    margin: 32px 0 48px;
    color: var(--merak-text-body);
    font-size: 18px;
    line-height: 1.7;
}
.one-page .product-section {
    padding: 56px 0;
    border-top: 1px solid var(--merak-warm-border);
}
.one-page .product-section .section-head { max-width: 720px; margin: 0 0 32px; text-align: left; }
.one-page .product-section .section-head h3,
.one-page .review-showcase__copy > h3#review-title {
    margin: 10px 0 0;
    color: var(--merak-text-primary);
    font: 500 clamp(30px, 3vw, 38px)/1.16 "Newsreader", Georgia, serif;
    letter-spacing: -.35px;
}
.one-page .product-section .section-sub { margin: 14px 0 0; font-size: 17px; line-height: 1.65; }
.one-page .lesson-grid { gap: 24px; }
.one-page #product .review-showcase {
    padding: 56px 0 0;
    border-top: 1px solid var(--merak-warm-border);
    background: transparent;
}
.one-page #product .review-showcase__inner { max-width: none; gap: 56px; }
.one-page .review-showcase__copy > p:not(.review-showcase__eyebrow) { font-size: 18px; line-height: 1.7; }
.one-page .review-showcase__eyebrow { font-size: 14px; }

.one-page .timeline .time-copy p { font-size: 17px; line-height: 1.65; }

/* The lab is the deliberate ink chapter; its method reads as an editorial loop. */
.one-page .chapter--lab {
    background: var(--merak-deep-ink);
    color: var(--merak-cream);
    border-color: var(--merak-deep-ink);
}
.one-page .chapter--lab .chapter-eyebrow { color: var(--merak-ink-accent); }
.one-page .chapter--lab .chapter-header h2,
.one-page .chapter--lab .chapter-header__intro strong { color: var(--merak-cream); }
.one-page .chapter--lab .chapter-header__intro p,
.one-page .chapter--lab .lab-loop p,
.one-page .chapter--lab .lab-status,
.one-page .chapter--lab .lab-team { color: color-mix(in srgb, var(--merak-cream) 84%, var(--merak-deep-ink)); }
.one-page .chapter--lab a { color: var(--merak-ink-accent); text-underline-offset: 4px; }
.one-page .chapter--lab :where(a, button, summary, [tabindex]):focus-visible { outline-color: var(--merak-ink-accent); }
.one-page .lab-definition { max-width: 76ch; margin: 0 0 30px; color: var(--merak-cream); font-size: 18px; line-height: 1.7; }
.one-page .lab-loop {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 64px;
    list-style: none;
    padding: 0;
    margin: 0;
}
.one-page .lab-loop > li {
    min-width: 0;
    padding: 30px 0 34px;
    border-top: 1px solid color-mix(in srgb, var(--merak-cream) 22%, var(--merak-deep-ink));
}
.one-page .lab-step-number { color: var(--merak-ink-accent); font-size: 14px; font-weight: 700; letter-spacing: .07em; }
.one-page .lab-loop h3 { margin: 14px 0 12px; color: var(--merak-cream); font: 500 29px/1.2 "Newsreader", Georgia, serif; }
.one-page .lab-loop p { max-width: 54ch; margin: 0; font-size: 17px; line-height: 1.7; }
.one-page .lab-loop p + p { margin-top: 12px; }
.one-page .lab-status {
    max-width: 76ch;
    margin: 22px 0 0;
    padding: 28px 0 0;
    border-top: 1px solid color-mix(in srgb, var(--merak-cream) 22%, var(--merak-deep-ink));
    font-size: 18px;
    line-height: 1.7;
}
.one-page .lab-status p { margin: 0; }
.one-page .lab-status p + p { margin-top: 14px; }
.one-page .lab-status strong, .one-page .lab-team strong { color: var(--merak-cream); font-weight: 700; }
.one-page .lab-team { max-width: 76ch; margin: 22px 0 0; font-size: 16px; line-height: 1.7; }
.one-page .lab-team p { margin: 0; }
.one-page .lab-team p + p { margin-top: 24px; }

/* Teaching and assistants keep their original demos inside the common frame. */
.one-page #models .format-teasers { margin: 0; padding: 0; border: 0; }
.one-page #models .format-teasers__grid { margin-top: 0; }
.one-page .model-direction { max-width: 76ch; margin: 0 0 36px; color: var(--merak-text-body); font-size: 18px; line-height: 1.7; }
.one-page .assistant-studio.chapter { background: var(--merak-cream); }
.one-page .assistant-studio.chapter .assistant-studio__grid,
.one-page .assistant-studio.chapter .assistant-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 64px;
    min-width: 0;
}
.one-page .assistant-studio.chapter .assistant-story { padding-top: 0; }
.one-page .assistant-studio.chapter .assistant-demo { justify-self: center; }
.one-page .assistant-studio.chapter .assistant-studio__note { max-width: 76ch; margin-top: 32px; }
.one-page .device-gallery-hint { display: none; }

/* Practical questions and direct contact have a quieter closing rhythm. */
.one-page .story-faq { padding: 80px var(--one-page-gutter); border-top: 1px solid var(--merak-warm-border); }
.one-page .story-faq__inner { max-width: var(--one-page-content-width); }
.one-page .story-faq h2 { max-width: 22ch; margin: 12px 0 32px; font-size: 40px; line-height: 1.15; }
.one-page .story-faq details, .one-page .story-faq__note { max-width: 840px; }
.one-page .story-faq summary { min-height: 60px; padding-block: 20px; font-size: 18px; line-height: 1.45; }
.one-page .story-faq details p { font-size: 17px; line-height: 1.7; }
.one-page .story-faq__note { font-size: 15px; }
.one-page .investor-strip {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: center;
    gap: 28px 64px;
    padding-block: 44px;
    padding-inline: max(var(--one-page-gutter), calc(50% - 560px));
    border-top: 1px solid var(--merak-warm-border);
    background: var(--merak-cream);
}
.one-page .investor-strip > * { min-width: 0; }
.one-page .investor-strip :is(h2, h3) { margin: 0 0 8px; font: 500 30px/1.2 "Newsreader", Georgia, serif; }
.one-page .investor-strip p { max-width: 58ch; margin: 0; color: var(--merak-text-body); font-size: 16px; line-height: 1.65; }
.one-page .investor-strip__links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 8px 28px; }
.one-page .investor-strip__links a { display: inline-flex; align-items: center; min-height: 44px; font-size: 16px; font-weight: 700; text-underline-offset: 5px; }
.one-page .footer { padding: 56px var(--one-page-gutter) 40px; }
.one-page .footer .container { width: 100%; max-width: var(--one-page-content-width); }
.one-page .footer h2 { max-width: 26ch; margin-inline: auto; font-size: clamp(30px, 3vw, 38px); line-height: 1.2; }
.one-page .footer-links { gap: 0 24px; margin-top: 20px; }
.one-page .footer-links a { display: inline-flex; align-items: center; min-height: 44px; }

@media (max-width: 1120px) {
    .one-page .hero .hero-inner { gap: 40px; }
    .one-page #product .review-showcase__inner { grid-template-columns: minmax(0, 1fr); gap: 32px; }
    .one-page #product .rv-pair { width: min(100%, 650px); margin-inline: auto; }
}

@media (max-width: 900px) {
    :root { --one-page-nav-height: 68px; --one-page-nav-offset: 68px; }
    .one-page .site-nav__inner { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 24px; }
    .one-page .site-nav__chapters { display: none; }
    .one-page .site-menu { display: block; position: static; }
    .one-page .site-menu__links { inset-block-start: calc(100% + 1px); }
    .one-page .site-nav__investor { padding-inline-start: 0; border: 0; }
    .one-page .chapter-header { grid-template-columns: minmax(0, 1fr); gap: 24px; margin-bottom: 40px; }
    .one-page .chapter-header h2 { max-width: 22ch; }
    .one-page .chapter-header__intro { padding-block-start: 0; }
    .one-page .chapter-header__intro p { max-width: 66ch; }
    .one-page #product .example-grid { grid-template-columns: minmax(0, 1fr); gap: 36px; }
    .one-page #product .path-card { max-width: 600px; }
    .one-page .assistant-studio.chapter .assistant-studio__grid,
    .one-page .assistant-studio.chapter .assistant-layout { grid-template-columns: minmax(0, 1fr); gap: 36px; }
    .one-page .assistant-studio.chapter .assistant-story h3 { max-width: 24ch; }
    .one-page .assistant-studio.chapter .assistant-demo { width: 100%; }
    .one-page .investor-strip { grid-template-columns: minmax(0, 1fr); gap: 18px; }
    .one-page .investor-strip__links { justify-content: flex-start; }
}

@media (max-width: 620px) {
    :root { --one-page-gutter: 16px; }
    .one-page { font-size: 16px; }
    .one-page .site-nav__inner { gap: 18px; }
    .one-page .site-nav__investor, .one-page .site-menu summary { font-size: 14px; }
    .one-page .hero { padding: 56px var(--one-page-gutter) 64px; }
    .one-page .hero .hero-inner { gap: 36px; }
    .one-page .hero .hero-copy { width: 100%; }
    .one-page .hero .lede { font-size: 17px; line-height: 1.65; }
    .one-page .hero .testflight { width: 100%; }
    .one-page .chapter, .one-page .assistant-studio.chapter { padding: 64px var(--one-page-gutter); }
    .one-page .chapter-header { gap: 22px; margin-bottom: 36px; }
    .one-page .chapter-eyebrow { margin-bottom: 14px; }
    .one-page .chapter-header h2 { max-width: 20ch; font-size: 36px; }
    .one-page .chapter-header__intro p { font-size: 17px; line-height: 1.7; }
    .one-page .catalogue-note { margin: 28px 0 36px; font-size: 17px; }
    .one-page .product-section { padding: 40px 0; }
    .one-page .product-section .section-head { margin-bottom: 28px; }
    .one-page .product-section .section-head h3,
    .one-page .review-showcase__copy > h3#review-title { font-size: 32px; }
    .one-page .product-section .section-sub { font-size: 16px; }
    .one-page .lesson-grid { grid-template-columns: minmax(0, 1fr); gap: 20px; }
    .one-page #product .review-showcase { padding: 40px 0 0; }
    .one-page .review-showcase__copy > p:not(.review-showcase__eyebrow) { font-size: 17px; }
    .one-page .lab-loop { grid-template-columns: minmax(0, 1fr); }
    .one-page .lab-loop > li { padding: 26px 0 28px; }
    .one-page .lab-loop h3 { font-size: 28px; }
    .one-page .lab-loop p { font-size: 16px; }
    .one-page .lab-definition, .one-page .model-direction { font-size: 17px; }
    .one-page .lab-status { margin-top: 8px; padding-top: 26px; font-size: 17px; }
    .one-page .lab-team { font-size: 16px; }
    .one-page .story-faq { padding: 64px var(--one-page-gutter); }
    .one-page .story-faq h2 { font-size: 36px; }
    .one-page .story-faq summary { font-size: 17px; }
    .one-page .story-faq details p { font-size: 16px; }
    .one-page .investor-strip { padding-block: 32px; }
    .one-page .footer { padding-block: 40px 28px; }
    .one-page .footer-links { gap: 0 18px; }

    /* Native galleries preserve readable device sizes and expose both examples.
       The browser owns scrolling; these are not scripted or auto-advancing. */
    .one-page .hero-product { max-width: 100%; }
    .one-page .hp-pair, .one-page .rv-phones {
        display: flex;
        align-items: flex-start;
        gap: 20px;
        width: 100%;
        max-width: 100%;
        min-width: 0;
        margin: 0;
        padding: 4px 4px 20px;
        overflow-x: auto;
        scroll-snap-type: x proximity;
        scroll-padding-inline: 4px;
        overscroll-behavior-x: contain;
        scrollbar-width: auto;
        scrollbar-color: var(--merak-text-secondary) var(--merak-warm-border);
    }
    .one-page .hp-pair > .hp-figure, .one-page .rv-phones > .rv-figure {
        flex: 0 0 min(300px, calc(100vw - 64px));
        min-width: 0;
        scroll-snap-align: start;
    }
    .one-page .hp-pair .hp-device, .one-page .rv-phones .rv-device { max-width: 100%; }
    .one-page #product .rv-pair { width: 100%; max-width: 100%; }
    .one-page .hp-disclosure, .one-page .rv-disclosure { max-width: 65ch; margin-inline: 0; text-align: left; }
    .one-page .device-gallery-hint { display: block; margin: 12px 0 0; color: var(--merak-text-secondary); font-size: 14px; line-height: 1.5; }
}

@media (max-width: 360px) {
    .one-page .site-nav__inner { gap: 12px; }
    .one-page .site-nav .merak-brand__name { font-size: 25px; }
}

/* A fixed row must not consume a short or heavily zoomed viewport. */
@media (max-height: 520px) {
    :root { --one-page-nav-offset: 0px; }
    .one-page .site-nav { position: static; }
}

@media (prefers-reduced-motion: reduce) {
    html:has(body.one-page) { scroll-behavior: auto; }
    .one-page .hp-pair, .one-page .rv-phones { scroll-snap-type: none; }
}

/* Teaching research remains a planned program. */
.lab-cycle-label { margin-top: 28px; margin-bottom: 16px; }
.lab-version-gate { margin: 28px 0 0; padding-top: 24px; border-top: 1px solid rgba(251,248,242,.22); max-width: 820px; font-size: 18px; line-height: 1.6; }
.lab-version-gate strong { display: block; margin-bottom: 8px; font: 500 27px/1.2 "Newsreader", Georgia, serif; }