/* ---------------------------------------------------------------
   stay — visual system

   organized as cascade layers so specificity is intentional,
   not accidental. read the layers first; everything else follows.
   --------------------------------------------------------------- */

@layer reset, tokens, base, layout, sections, components, motion, a11y;

/* ----- tokens ---------------------------------------------------- */
@layer tokens {
    :root {
        color-scheme: dark;

        /* — space (perfect-fifth-ish scale) */
        --space-1:  0.25rem;
        --space-2:  0.5rem;
        --space-3:  0.75rem;
        --space-4:  1rem;
        --space-5:  1.5rem;
        --space-6:  2rem;
        --space-7:  3rem;
        --space-8:  4rem;
        --space-9:  6rem;
        --space-10: 8rem;
        --space-11: 12rem;

        /* — ink */
        --ink:       #f2e9ff;
        --ink-dim:   #a89bc8;
        --ink-mute:  #6c5f8c;
        --ink-faint: #3a3159;
        --ink-line:  color-mix(in oklab, var(--ink) 8%, transparent);

        /* — surface */
        --bg:        #08051a;
        --bg-soft:   #0d0824;
        --bg-elev:   #120a2e;

        /* — accent */
        --violet:      #a78bfa;
        --violet-warm: #c4b5fd;
        --violet-deep: #7c3aed;
        --violet-glow: color-mix(in oklab, var(--violet) 55%, transparent);
        --star:        #f3e8ff;
        --amber:       #e9d5a1;

        /* — type */
        --face-display: "UnifrakturCook", "Cormorant Garamond", serif;
        --face-serif:   "EB Garamond", "Iowan Old Style", Georgia, serif;
        --face-sans:    "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
        --face-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

        /* fluid steps — min viewport 375px, max 1440px */
        --step-mega:    clamp(6.5rem, 4rem + 22vw, 18rem);   /* hero "stay" */
        --step-display: clamp(2.75rem, 1.5rem + 5vw,  5.5rem);
        --step-h2:      clamp(2rem,    1.1rem + 3.5vw, 3.75rem);
        --step-h3:      clamp(1.375rem, 1rem + 1.4vw, 1.875rem);
        --step-lede:    clamp(1.0625rem, 0.95rem + 0.5vw, 1.25rem);
        --step-body:    1rem;
        --step-small:   0.8125rem;
        --step-micro:   0.6875rem;

        /* — motion */
        --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
        --ease-in:  cubic-bezier(0.7, 0, 0.84, 0);
        --ease-mid: cubic-bezier(0.65, 0, 0.35, 1);
        --dur-1: 180ms;
        --dur-2: 320ms;
        --dur-3: 520ms;
        --dur-4: 820ms;

        /* — layout */
        --measure: 66ch;
        --container: 76rem;
        --gutter: clamp(1.25rem, 4vw, 2.5rem);
        --rule: 1px solid var(--ink-line);
    }
}

/* ----- reset ----------------------------------------------------- */
@layer reset {
    *, *::before, *::after { box-sizing: border-box; }
    * { margin: 0; padding: 0; }

    html {
        -webkit-text-size-adjust: 100%;
        text-size-adjust: 100%;
        text-rendering: optimizeLegibility;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        scroll-behavior: smooth;
        scroll-padding-top: 96px;
        overflow-x: hidden;
    }

    body {
        min-height: 100dvh;
        line-height: 1.6;
        text-wrap: pretty;
    }

    img, svg, video, canvas { display: block; max-width: 100%; height: auto; }

    button {
        font: inherit;
        background: none;
        border: none;
        color: inherit;
        cursor: pointer;
    }

    a { color: inherit; text-decoration: none; }

    ul, ol { list-style: none; }

    ::selection {
        background: var(--violet);
        color: #0a0512;
    }

    ::-webkit-scrollbar { width: 8px; height: 8px; }
    ::-webkit-scrollbar-track { background: transparent; }
    ::-webkit-scrollbar-thumb {
        background: color-mix(in oklab, var(--violet) 30%, transparent);
        border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
        background: var(--violet);
    }
}

/* ----- base ------------------------------------------------------ */
@layer base {
    body {
        background: var(--bg);
        color: var(--ink);
        font-family: var(--face-sans);
        font-size: var(--step-body);
        font-weight: 400;
        cursor: none;
    }

    /* touch devices get native cursor back */
    @media (hover: none) {
        body { cursor: auto; }
    }

    ::placeholder { color: var(--ink-mute); }

    :focus-visible {
        outline: 2px solid var(--violet);
        outline-offset: 3px;
        border-radius: 2px;
    }

    .num {
        font-family: var(--face-serif);
        font-style: italic;
        font-weight: 500;
        font-feature-settings: "onum", "lnum";
    }
}

/* ----- layout ---------------------------------------------------- */
@layer layout {
    main {
        display: flex;
        flex-direction: column;
    }

    /* container that centers, with fluid gutter */
    .masthead,
    .manifesto,
    .chapter,
    .vitals,
    .ledger-cta,
    .colophon {
        padding-inline: var(--gutter);
        max-width: var(--container);
        margin-inline: auto;
        width: 100%;
    }

    .chapter,
    .vitals,
    .ledger-cta,
    .manifesto {
        padding-block: clamp(4rem, 6rem + 6vw, 11rem);
    }
}

/* ----- ambient layers -------------------------------------------- */
@layer sections {

    .ambient {
        position: fixed;
        inset: 0;
        z-index: -1;
        pointer-events: none;
    }

    .ambient__stars {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
    }

    /* film grain — svg-based noise, low opacity */
    .ambient__grain {
        position: absolute;
        inset: 0;
        opacity: 0.07;
        mix-blend-mode: overlay;
        background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.55 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
        background-size: 240px 240px;
    }

    .ambient__vignette {
        position: absolute;
        inset: 0;
        background:
            radial-gradient(ellipse at 50% 0%, transparent 20%, color-mix(in oklab, var(--bg) 90%, black) 100%),
            radial-gradient(circle at 12% 8%, color-mix(in oklab, var(--violet-deep) 20%, transparent), transparent 60%),
            radial-gradient(circle at 88% 12%, color-mix(in oklab, var(--violet) 12%, transparent), transparent 55%);
    }
}

/* ----- masthead -------------------------------------------------- */
@layer sections {
    .masthead {
        display: grid;
        grid-template-columns: auto 1fr auto;
        align-items: center;
        gap: var(--space-6);
        padding-block: var(--space-5);
        position: sticky;
        top: 0;
        z-index: 30;
        max-width: none;
        padding-inline: max(var(--gutter), calc(50vw - var(--container) / 2 + var(--gutter)));
        transition: background var(--dur-2) var(--ease-out),
                    border-color var(--dur-2) var(--ease-out);
        border-bottom: 1px solid transparent;
    }
    .masthead[data-scrolled="true"] {
        background: color-mix(in oklab, var(--bg) 78%, transparent);
        backdrop-filter: blur(14px) saturate(140%);
        -webkit-backdrop-filter: blur(14px) saturate(140%);
        border-bottom-color: var(--ink-line);
    }

    .masthead__brand {
        display: inline-flex;
        align-items: center;
        gap: var(--space-3);
    }
    .masthead__logo {
        width: 40px;
        height: 40px;
        border-radius: 10px;
        mix-blend-mode: screen;
        filter: drop-shadow(0 0 12px var(--violet-glow));
    }
    .masthead__word {
        font-family: var(--face-display);
        font-size: 1.75rem;
        line-height: 1;
        letter-spacing: 0.01em;
        color: var(--ink);
        transform: translateY(-1px);
    }

    .masthead__nav {
        justify-self: center;
        display: flex;
        gap: clamp(1rem, 3vw, 2.25rem);
        font-family: var(--face-serif);
        font-size: 1.0625rem;
        color: var(--ink-dim);
    }
    .masthead__nav a {
        display: inline-flex;
        align-items: baseline;
        gap: 0.4em;
        transition: color var(--dur-1) var(--ease-out);
        position: relative;
    }
    .masthead__nav a .num {
        font-size: 0.75em;
        color: var(--violet);
        opacity: 0.9;
    }
    .masthead__nav a::after {
        content: "";
        position: absolute;
        left: 0;
        right: 100%;
        bottom: -4px;
        height: 1px;
        background: var(--violet);
        transition: right var(--dur-2) var(--ease-out);
    }
    .masthead__nav a:hover {
        color: var(--ink);
    }
    .masthead__nav a:hover::after {
        right: 0;
    }

    .masthead__cta {
        display: inline-flex;
        align-items: center;
        gap: var(--space-2);
        padding: 0.6rem 1rem;
        border: 1px solid var(--ink-line);
        border-radius: 999px;
        font-family: var(--face-mono);
        font-size: var(--step-small);
        letter-spacing: 0.06em;
        text-transform: uppercase;
        color: var(--ink-dim);
        transition: color var(--dur-1) var(--ease-out),
                    border-color var(--dur-1) var(--ease-out),
                    background var(--dur-1) var(--ease-out);
    }
    .masthead__cta:hover {
        color: var(--ink);
        border-color: color-mix(in oklab, var(--violet) 55%, transparent);
        background: color-mix(in oklab, var(--violet) 8%, transparent);
    }

    /* small "heartbeat" pulse dot */
    .pulse {
        display: inline-block;
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--violet);
        box-shadow: 0 0 0 0 var(--violet-glow);
        animation: heartbeat 2.4s var(--ease-mid) infinite;
    }
    .pulse--large {
        width: 8px;
        height: 8px;
        transform: translateY(-1px);
    }
    @keyframes heartbeat {
        0%   { box-shadow: 0 0 0 0 var(--violet-glow); }
        70%  { box-shadow: 0 0 0 12px transparent; }
        100% { box-shadow: 0 0 0 0 transparent; }
    }
}

/* ----- hero ------------------------------------------------------ */
@layer sections {

    .hero {
        position: relative;
        min-height: 100dvh;
        display: grid;
        place-items: center;
        text-align: center;
        padding: max(6rem, 12vh) var(--gutter) 6rem;
        overflow: clip;
    }

    .hero__meta {
        display: inline-flex;
        align-items: center;
        gap: 0.6em;
        color: var(--ink-mute);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.24em;
        text-transform: uppercase;
        margin-bottom: var(--space-7);
    }
    .hero__meta .num { color: var(--violet); font-style: normal; }

    .hero__wordmark {
        position: relative;
        line-height: 0.9;
        font-weight: 400;
        margin: 0;
    }
    .hero__mark {
        display: inline-block;
        font-family: var(--face-display);
        font-size: var(--step-mega);
        letter-spacing: -0.01em;
        color: var(--ink);
        background: linear-gradient(180deg,
            var(--star) 0%,
            var(--ink) 42%,
            var(--violet-warm) 100%);
        -webkit-background-clip: text;
        background-clip: text;
        color: transparent;
        text-shadow: 0 0 60px color-mix(in oklab, var(--violet) 45%, transparent);
        position: relative;
        z-index: 2;
    }

    /* the violet flame ring behind the wordmark */
    .hero__flame {
        position: absolute;
        left: 50%;
        top: 55%;
        width: min(120%, 1200px);
        aspect-ratio: 1.6 / 1;
        transform: translate(-50%, -50%);
        border-radius: 50%;
        background:
            radial-gradient(ellipse at 50% 50%,
                color-mix(in oklab, var(--violet) 30%, transparent) 0%,
                transparent 55%),
            conic-gradient(from 90deg at 50% 50%,
                transparent 0deg,
                color-mix(in oklab, var(--violet) 60%, transparent) 60deg,
                color-mix(in oklab, var(--violet-deep) 90%, transparent) 120deg,
                transparent 220deg,
                color-mix(in oklab, var(--violet) 50%, transparent) 300deg,
                transparent 360deg);
        filter: blur(48px) saturate(140%);
        opacity: 0.6;
        z-index: 1;
        animation: drift 30s linear infinite;
    }
    @keyframes drift {
        to { transform: translate(-50%, -50%) rotate(360deg); }
    }

    .hero__spec {
        margin-top: var(--space-7);
        display: inline-flex;
        align-items: center;
        gap: 0.9em;
        font-family: var(--face-mono);
        font-size: var(--step-small);
        letter-spacing: 0.32em;
        text-transform: uppercase;
        color: var(--ink-dim);
    }
    .hero__spec em {
        color: var(--violet);
        font-style: normal;
        transform: translateY(-0.1em);
        opacity: 0.75;
    }

    .hero__scroll {
        position: absolute;
        left: 50%;
        bottom: max(2rem, 4vh);
        transform: translateX(-50%);
        display: inline-flex;
        flex-direction: column;
        align-items: center;
        gap: var(--space-3);
        color: var(--ink-mute);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        transition: color var(--dur-2) var(--ease-out);
    }
    .hero__scroll:hover { color: var(--ink); }
    .hero__scroll-line {
        width: 1px;
        height: 42px;
        background: linear-gradient(180deg, var(--ink-mute), transparent);
        position: relative;
        overflow: hidden;
    }
    .hero__scroll-line::before {
        content: "";
        position: absolute;
        left: 0;
        top: -50%;
        width: 100%;
        height: 40%;
        background: linear-gradient(180deg, transparent, var(--violet));
        animation: drop 2.4s var(--ease-mid) infinite;
    }
    @keyframes drop {
        0%   { top: -50%; }
        100% { top: 120%; }
    }
}

/* ----- manifesto ------------------------------------------------- */
@layer sections {

    .manifesto {
        max-width: 60rem;
        text-align: center;
    }
    .manifesto__eyebrow {
        color: var(--ink-mute);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        margin-bottom: var(--space-7);
    }
    .manifesto__eyebrow .num { color: var(--violet); font-style: normal; }

    .manifesto__text {
        font-family: var(--face-serif);
        font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.375rem);
        line-height: 1.35;
        color: var(--ink);
        font-weight: 400;
        letter-spacing: -0.01em;
        text-wrap: balance;
    }
    .manifesto__text em {
        font-style: italic;
        color: var(--violet-warm);
    }
    .manifesto__cite {
        margin-top: var(--space-6);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.2em;
        text-transform: uppercase;
        color: var(--ink-mute);
    }
}

/* ----- chapter (shared header) ----------------------------------- */
@layer sections {

    .chapter__head {
        display: grid;
        grid-template-columns: minmax(6rem, 10rem) 1fr;
        gap: clamp(1.5rem, 4vw, 4rem);
        align-items: start;
        margin-bottom: clamp(3rem, 6vw, 5rem);
        padding-block-end: var(--space-6);
        border-bottom: var(--rule);
    }

    .chapter__num {
        font-family: var(--face-serif);
        font-style: italic;
        font-weight: 500;
        font-feature-settings: "onum";
        font-size: clamp(3rem, 2rem + 3.5vw, 5.25rem);
        line-height: 1;
        color: var(--violet);
        letter-spacing: -0.03em;
    }

    .chapter__label {
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        color: var(--ink-mute);
        margin-bottom: var(--space-4);
    }
    .chapter__title {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: var(--step-h2);
        line-height: 1.04;
        letter-spacing: -0.02em;
        color: var(--ink);
        margin-bottom: var(--space-5);
    }
    .chapter__title em {
        font-style: italic;
        color: var(--violet-warm);
    }
    .chapter__lede {
        max-width: 42rem;
        color: var(--ink-dim);
        font-size: var(--step-lede);
        line-height: 1.6;
    }
}

/* ----- ledger (firmware list) ------------------------------------ */
@layer sections {

    .ledger {
        display: flex;
        flex-direction: column;
    }

    .ledger__row {
        display: grid;
        grid-template-columns: minmax(3.5rem, 5rem) 1fr auto;
        gap: clamp(1rem, 3vw, 2.5rem);
        align-items: start;
        padding-block: clamp(1.75rem, 3vw, 2.75rem);
        border-top: var(--rule);
        position: relative;
        isolation: isolate;
    }
    .ledger__row:last-child { border-bottom: var(--rule); }

    /* hover halo behind the row */
    .ledger__row::before {
        content: "";
        position: absolute;
        inset: -1px calc(-1 * var(--gutter));
        background: linear-gradient(90deg,
            transparent 0%,
            color-mix(in oklab, var(--violet) 6%, transparent) 40%,
            transparent 100%);
        opacity: 0;
        transition: opacity var(--dur-3) var(--ease-out);
        z-index: -1;
    }
    .ledger__row:hover::before { opacity: 1; }

    .ledger__num {
        font-family: var(--face-mono);
        font-size: 0.875rem;
        color: var(--ink-mute);
        letter-spacing: 0.12em;
        padding-top: 0.6rem;
    }

    .ledger__body {
        display: flex;
        flex-direction: column;
        gap: var(--space-3);
        max-width: 44rem;
    }

    .ledger__name {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: var(--step-h3);
        letter-spacing: -0.01em;
        color: var(--ink);
        line-height: 1.1;
        margin-bottom: var(--space-1);
    }
    .ledger__whisper {
        font-style: italic;
        color: var(--ink-mute);
        font-weight: 400;
        font-size: 0.78em;
    }
    .ledger__row--private .ledger__name {
        color: var(--amber);
    }

    .ledger__desc {
        color: var(--ink-dim);
        font-size: 1rem;
        line-height: 1.6;
        max-width: 38rem;
    }

    .ledger__tags {
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem 0.6rem;
        margin-top: var(--space-2);
    }
    .ledger__tags li {
        font-family: var(--face-mono);
        font-size: 0.6875rem;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--ink-dim);
        padding: 0.25rem 0.55rem;
        border: 1px solid var(--ink-line);
        border-radius: 4px;
    }
    .ledger__row--private .ledger__tags li:first-child {
        color: var(--amber);
        border-color: color-mix(in oklab, var(--amber) 30%, transparent);
    }

    .ledger__meta {
        display: flex;
        flex-direction: column;
        align-items: flex-end;
        gap: var(--space-3);
        text-align: right;
        min-width: 8rem;
    }

    .ledger__warranty {
        font-family: var(--face-mono);
        font-size: 0.6875rem;
        letter-spacing: 0.18em;
        text-transform: uppercase;
        color: var(--ink-mute);
        max-width: 12rem;
        text-align: right;
        line-height: 1.5;
    }

    .ledger__price {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: clamp(2rem, 1.4rem + 1.8vw, 2.75rem);
        line-height: 1;
        color: var(--ink);
        font-feature-settings: "lnum", "tnum";
        letter-spacing: -0.02em;
    }
    .ledger__row--private .ledger__price { color: var(--amber); }

    .ledger__cta {
        font-family: var(--face-serif);
        font-style: italic;
        font-size: 1rem;
        color: var(--violet);
        border-bottom: 1px solid transparent;
        padding-bottom: 2px;
        transition: color var(--dur-1) var(--ease-out),
                    border-color var(--dur-1) var(--ease-out),
                    letter-spacing var(--dur-2) var(--ease-out);
    }
    .ledger__cta:hover {
        color: var(--violet-warm);
        border-bottom-color: currentColor;
        letter-spacing: 0.02em;
    }
    .ledger__row--private .ledger__cta { color: var(--amber); }
}

/* ----- variants (RDMA tiers) ------------------------------------- */
@layer sections {

    .variants {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: clamp(0.875rem, 1.5vw, 1.25rem);
        align-items: stretch;
    }

    .variant {
        position: relative;
        padding: clamp(1.75rem, 2.4vw, 2.25rem);
        border: 1px solid var(--ink-line);
        border-radius: 18px;
        background:
            radial-gradient(ellipse at 100% -15%, color-mix(in oklab, var(--violet-deep) 14%, transparent), transparent 55%),
            color-mix(in oklab, var(--bg) 90%, black);
        display: flex;
        flex-direction: column;
        gap: var(--space-4);
        isolation: isolate;
        transition:
            border-color var(--dur-2) var(--ease-out),
            transform var(--dur-2) var(--ease-out);
    }
    .variant:hover {
        border-color: color-mix(in oklab, var(--violet) 40%, transparent);
    }

    .variant--faceit {
        border-color: color-mix(in oklab, var(--violet) 22%, transparent);
        background:
            radial-gradient(ellipse at 100% -15%, color-mix(in oklab, var(--violet) 22%, transparent), transparent 55%),
            color-mix(in oklab, var(--bg) 88%, black);
    }
    .variant--faceit:hover {
        border-color: color-mix(in oklab, var(--violet) 55%, transparent);
    }

    .variant--whql {
        border-color: color-mix(in oklab, var(--amber) 32%, transparent);
        background:
            radial-gradient(ellipse at 100% -15%, color-mix(in oklab, var(--amber) 16%, transparent), transparent 55%),
            color-mix(in oklab, var(--bg) 86%, black);
    }
    .variant--whql:hover {
        border-color: color-mix(in oklab, var(--amber) 55%, transparent);
    }

    /* corner ribbon — only used on the flagship */
    .variant__ribbon {
        position: absolute;
        top: 16px;
        right: 16px;
        padding: 0.35rem 0.75rem;
        font-family: var(--face-mono);
        font-size: 0.625rem;
        letter-spacing: 0.2em;
        text-transform: uppercase;
        color: color-mix(in oklab, var(--amber) 90%, white);
        border: 1px solid color-mix(in oklab, var(--amber) 50%, transparent);
        background: color-mix(in oklab, var(--amber) 10%, transparent);
        border-radius: 999px;
    }

    .variant__head {
        display: flex;
        flex-direction: column;
        gap: var(--space-2);
        padding-bottom: var(--space-4);
        border-bottom: var(--rule);
    }
    .variant__meta {
        font-family: var(--face-mono);
        font-size: 0.6875rem;
        letter-spacing: 0.24em;
        text-transform: uppercase;
        color: var(--violet);
        display: inline-flex;
        align-items: baseline;
    }
    .variant__meta .num {
        font-size: 0.9em;
        margin-right: 0.15em;
        color: var(--violet);
    }
    .variant--whql .variant__meta,
    .variant--whql .variant__meta .num { color: var(--amber); }

    .variant__name {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: clamp(1.5rem, 1.15rem + 1.1vw, 2.125rem);
        line-height: 1.05;
        letter-spacing: -0.02em;
        color: var(--ink);
    }
    .variant__name em {
        font-style: italic;
        color: var(--violet-warm);
    }
    .variant--whql .variant__name em { color: var(--amber); }

    .variant__phrase {
        font-family: var(--face-mono);
        font-size: 0.6875rem;
        letter-spacing: 0.2em;
        text-transform: uppercase;
        color: var(--ink-mute);
    }

    .variant__desc {
        color: var(--ink-dim);
        font-size: 0.9375rem;
        line-height: 1.65;
        max-width: 30rem;
    }

    .variant__badges {
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem;
    }
    .variant__badges li {
        font-family: var(--face-mono);
        font-size: 0.625rem;
        letter-spacing: 0.16em;
        text-transform: uppercase;
        color: var(--amber);
        padding: 0.4rem 0.6rem;
        border: 1px solid color-mix(in oklab, var(--amber) 40%, transparent);
        border-radius: 999px;
        background: color-mix(in oklab, var(--amber) 6%, transparent);
    }

    .variant__coverage {
        display: flex;
        flex-wrap: wrap;
        gap: 0.35rem 0.4rem;
    }
    .variant__coverage li {
        font-family: var(--face-mono);
        font-size: 0.6875rem;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--ink-dim);
        padding: 0.25rem 0.55rem;
        border: 1px solid var(--ink-line);
        border-radius: 4px;
    }
    .variant__star {
        color: var(--amber) !important;
        border-color: color-mix(in oklab, var(--amber) 40%, transparent) !important;
    }

    .variant__menu {
        margin-top: auto;
        display: flex;
        flex-direction: column;
        border-top: var(--rule);
    }
    .variant__row {
        display: grid;
        grid-template-columns: minmax(4.5rem, auto) 1fr auto auto;
        align-items: baseline;
        gap: var(--space-3);
        padding-block: var(--space-4);
        border-bottom: var(--rule);
        transition: background var(--dur-2) var(--ease-out);
    }
    .variant__row:last-child { border-bottom: none; padding-bottom: 0; }
    .variant__row:hover { background: color-mix(in oklab, var(--violet) 5%, transparent); }
    .variant--whql .variant__row:hover { background: color-mix(in oklab, var(--amber) 6%, transparent); }

    .variant__dur {
        font-family: var(--face-serif);
        font-style: italic;
        font-size: clamp(1.125rem, 0.9rem + 0.6vw, 1.375rem);
        color: var(--ink);
        line-height: 1;
    }

    .variant__leader {
        min-width: 1.5rem;
        height: 1px;
        background-image: radial-gradient(circle, var(--ink-mute) 1px, transparent 1px);
        background-size: 6px 6px;
        background-position: 0 50%;
        background-repeat: repeat-x;
        opacity: 0.5;
        transform: translateY(-0.35em);
    }

    .variant__price {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: clamp(1.125rem, 0.9rem + 0.6vw, 1.375rem);
        color: var(--ink);
        font-feature-settings: "lnum", "tnum";
        letter-spacing: -0.01em;
    }
    .variant--whql .variant__price { color: var(--amber); }

    .variant__cta {
        display: inline-grid;
        place-items: center;
        width: 32px;
        height: 32px;
        border-radius: 50%;
        border: 1px solid var(--ink-line);
        color: var(--violet);
        font-size: 1rem;
        transition:
            color var(--dur-1) var(--ease-out),
            border-color var(--dur-1) var(--ease-out),
            background var(--dur-1) var(--ease-out),
            transform var(--dur-2) var(--ease-out);
    }
    .variant__cta:hover {
        color: var(--bg);
        background: var(--violet);
        border-color: var(--violet);
        transform: rotate(-45deg);
    }
    .variant--whql .variant__cta { color: var(--amber); }
    .variant--whql .variant__cta:hover {
        color: var(--bg);
        background: var(--amber);
        border-color: var(--amber);
    }
}

/* ----- vitals ---------------------------------------------------- */
@layer sections {

    .vitals {
        max-width: 66rem;
        text-align: center;
    }

    .vitals__eyebrow {
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        color: var(--ink-mute);
        margin-bottom: var(--space-8);
        display: inline-flex;
        align-items: baseline;
        gap: 0.6em;
    }
    .vitals__eyebrow .chapter__num {
        font-size: 1rem;
        color: var(--violet);
    }

    .vitals__list {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: clamp(1.5rem, 3vw, 3rem);
        border-block: var(--rule);
        padding-block: clamp(2rem, 4vw, 3.5rem);
    }

    .vitals__pair {
        display: flex;
        flex-direction: column;
        gap: var(--space-3);
        align-items: center;
    }

    .vitals__pair dt {
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.24em;
        text-transform: uppercase;
        color: var(--ink-mute);
        order: 2;
    }
    .vitals__pair dd {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: clamp(2rem, 1.4rem + 2vw, 3rem);
        color: var(--ink);
        line-height: 1;
        letter-spacing: -0.02em;
        display: inline-flex;
        align-items: baseline;
        gap: 0.15em;
        order: 1;
    }
    .vitals__plus {
        font-size: 0.6em;
        color: var(--violet);
        transform: translateY(-0.55em);
    }

    .vitals__footnote {
        margin-top: var(--space-6);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.22em;
        text-transform: uppercase;
        color: var(--ink-mute);
    }
}

/* ----- interview (FAQ) ------------------------------------------- */
@layer sections {

    .chapter--interview .interview {
        display: grid;
        gap: var(--space-9);
    }

    .interview__qa {
        display: grid;
        grid-template-columns: minmax(0, 22rem) 1fr;
        gap: clamp(1.5rem, 4vw, 4rem);
        align-items: baseline;
        padding-bottom: var(--space-7);
        border-bottom: var(--rule);
    }
    .interview__qa:last-child { border-bottom: none; padding-bottom: 0; }

    .interview__q {
        font-family: var(--face-serif);
        font-style: italic;
        font-weight: 500;
        font-size: clamp(1.375rem, 1rem + 1vw, 1.75rem);
        line-height: 1.25;
        color: var(--ink);
        letter-spacing: -0.01em;
    }
    .interview__q em {
        color: var(--violet-warm);
    }

    .interview__a {
        font-size: var(--step-lede);
        line-height: 1.6;
        color: var(--ink-dim);
        max-width: 42rem;
    }
}

/* ----- ledger-cta ------------------------------------------------ */
@layer sections {

    .ledger-cta {
        text-align: center;
        max-width: 46rem;
        padding-bottom: clamp(6rem, 10vw, 10rem);
    }

    .ledger-cta__eyebrow {
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        color: var(--ink-mute);
        margin-bottom: var(--space-6);
        display: inline-flex;
        align-items: baseline;
        gap: 0.6em;
    }
    .ledger-cta__eyebrow .chapter__num {
        font-size: 1rem;
        color: var(--violet);
    }

    .ledger-cta__title {
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: clamp(2.25rem, 1.4rem + 4vw, 4rem);
        line-height: 1.02;
        letter-spacing: -0.02em;
        margin-bottom: var(--space-6);
    }
    .ledger-cta__title em {
        font-style: italic;
        color: var(--violet-warm);
    }

    .ledger-cta__body {
        color: var(--ink-dim);
        font-size: var(--step-lede);
        line-height: 1.65;
        margin-bottom: var(--space-8);
        max-width: 34rem;
        margin-inline: auto;
    }

    .ledger-cta__actions {
        display: flex;
        gap: var(--space-4);
        justify-content: center;
        flex-wrap: wrap;
        margin-bottom: var(--space-6);
    }

    .ledger-cta__url {
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.24em;
        text-transform: uppercase;
        color: var(--ink-mute);
    }
}

/* ----- colophon (footer) ----------------------------------------- */
@layer sections {

    .colophon {
        padding-block: clamp(4rem, 6vw, 6rem);
        border-top: var(--rule);
    }

    .colophon__mark {
        display: inline-flex;
        align-items: center;
        gap: var(--space-3);
        margin-bottom: var(--space-6);
    }
    .colophon__logo {
        width: 36px;
        height: 36px;
        border-radius: 9px;
        mix-blend-mode: screen;
    }
    .colophon__word {
        font-family: var(--face-display);
        font-size: 1.5rem;
        line-height: 1;
        color: var(--ink);
    }

    .colophon__legend {
        font-family: var(--face-serif);
        font-style: italic;
        font-size: 1.125rem;
        line-height: 1.55;
        color: var(--ink-dim);
        max-width: 36rem;
        margin-bottom: var(--space-9);
    }

    .colophon__cols {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: clamp(2rem, 4vw, 4rem);
        padding-bottom: var(--space-7);
        border-bottom: var(--rule);
    }
    .colophon__cols h4 {
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        color: var(--ink-mute);
        font-weight: 500;
        margin-bottom: var(--space-4);
    }
    .colophon__cols ul {
        display: flex;
        flex-direction: column;
        gap: var(--space-3);
    }
    .colophon__cols a {
        font-family: var(--face-serif);
        font-size: 1rem;
        color: var(--ink);
        transition: color var(--dur-1) var(--ease-out);
    }
    .colophon__cols a:hover { color: var(--violet); }

    .colophon__bottom {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding-top: var(--space-6);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.22em;
        text-transform: uppercase;
        color: var(--ink-mute);
        flex-wrap: wrap;
        gap: var(--space-4);
    }
    .colophon__bottom .pulse {
        margin-right: var(--space-2);
        transform: translateY(-1px);
    }
}

/* ----- components ------------------------------------------------ */
@layer components {

    /* buttons */
    .button {
        display: inline-flex;
        align-items: center;
        gap: 0.6em;
        padding: 0.85rem 1.5rem;
        border-radius: 999px;
        font-family: var(--face-sans);
        font-size: 0.9375rem;
        font-weight: 500;
        letter-spacing: 0.01em;
        border: 1px solid transparent;
        transition: transform var(--dur-2) var(--ease-out),
                    background var(--dur-2) var(--ease-out),
                    color var(--dur-2) var(--ease-out),
                    border-color var(--dur-2) var(--ease-out),
                    box-shadow var(--dur-2) var(--ease-out);
    }
    .button--primary {
        background: linear-gradient(180deg, var(--violet), var(--violet-deep));
        color: var(--star);
        box-shadow:
            0 1px 0 color-mix(in oklab, var(--star) 20%, transparent) inset,
            0 20px 40px -12px var(--violet-glow);
    }
    .button--primary:hover {
        transform: translateY(-1px);
        box-shadow:
            0 1px 0 color-mix(in oklab, var(--star) 20%, transparent) inset,
            0 30px 60px -12px var(--violet-glow);
    }
    .button--ghost {
        color: var(--ink-dim);
        border-color: var(--ink-line);
        background: transparent;
    }
    .button--ghost:hover {
        color: var(--ink);
        border-color: var(--ink);
    }
    .button--full {
        width: 100%;
        justify-content: center;
    }

    /* modal (native <dialog>) */
    .ticket {
        border: none;
        outline: none;
        padding: 0;
        max-width: 32rem;
        width: min(92vw, 32rem);
        border-radius: 20px;
        background:
            radial-gradient(ellipse at 50% -10%, color-mix(in oklab, var(--violet) 20%, transparent), transparent 60%),
            var(--bg-elev);
        color: var(--ink);
        text-align: center;
        margin: auto;
    }
    .ticket[open] {
        animation: ticketIn var(--dur-3) var(--ease-out);
    }
    .ticket::backdrop {
        background: color-mix(in oklab, var(--bg) 85%, black);
        backdrop-filter: blur(10px) saturate(130%);
        -webkit-backdrop-filter: blur(10px) saturate(130%);
        animation: backdropIn var(--dur-2) var(--ease-out);
    }
    @keyframes ticketIn {
        from { opacity: 0; transform: translateY(24px) scale(0.97); }
        to   { opacity: 1; transform: none; }
    }
    @keyframes backdropIn {
        from { opacity: 0; }
        to   { opacity: 1; }
    }

    .ticket > * { padding-inline: clamp(1.5rem, 4vw, 2.75rem); }
    .ticket__eyebrow {
        padding-top: clamp(2.25rem, 5vw, 3rem);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.28em;
        text-transform: uppercase;
        color: var(--ink-mute);
    }
    .ticket__eyebrow .num { color: var(--violet); font-style: normal; }

    .ticket__title {
        margin-block: var(--space-4);
        font-family: var(--face-serif);
        font-weight: 500;
        font-size: clamp(1.5rem, 1rem + 1.6vw, 2rem);
        line-height: 1.15;
        letter-spacing: -0.01em;
    }
    .ticket__title em {
        font-style: italic;
        color: var(--violet-warm);
    }

    .ticket__body {
        color: var(--ink-dim);
        font-size: 1rem;
        line-height: 1.6;
        margin-bottom: var(--space-6);
    }

    .ticket .button {
        margin-bottom: var(--space-5);
    }

    .ticket__url {
        padding-bottom: clamp(1.75rem, 4vw, 2.5rem);
        font-family: var(--face-mono);
        font-size: var(--step-micro);
        letter-spacing: 0.24em;
        text-transform: uppercase;
        color: var(--ink-mute);
    }

    .ticket__close {
        position: absolute;
        top: 12px;
        right: 12px;
        width: 32px;
        height: 32px;
        border-radius: 50%;
        display: inline-grid;
        place-items: center;
        color: var(--ink-mute);
        font-size: 1.25rem;
        line-height: 1;
        border: 1px solid var(--ink-line);
        transition: color var(--dur-1), border-color var(--dur-1), transform var(--dur-2);
    }
    .ticket__close:hover {
        color: var(--ink);
        border-color: var(--ink);
        transform: rotate(90deg);
    }

    /* custom cursor */
    .cursor {
        position: fixed;
        top: 0;
        left: 0;
        pointer-events: none;
        z-index: 9999;
        mix-blend-mode: difference;
    }
    .cursor__dot {
        position: absolute;
        left: -3px;
        top: -3px;
        width: 6px;
        height: 6px;
        border-radius: 50%;
        background: var(--star);
        transition: transform var(--dur-1) var(--ease-out),
                    opacity var(--dur-1) var(--ease-out);
    }
    .cursor__ring {
        position: absolute;
        left: -18px;
        top: -18px;
        width: 36px;
        height: 36px;
        border-radius: 50%;
        border: 1px solid var(--star);
        opacity: 0.35;
        transition: width var(--dur-2) var(--ease-out),
                    height var(--dur-2) var(--ease-out),
                    left var(--dur-2) var(--ease-out),
                    top var(--dur-2) var(--ease-out),
                    opacity var(--dur-2) var(--ease-out);
    }
    .cursor[data-hover="true"] .cursor__dot { opacity: 0; }
    .cursor[data-hover="true"] .cursor__ring {
        width: 56px;
        height: 56px;
        left: -28px;
        top: -28px;
        opacity: 0.7;
    }
    @media (hover: none) {
        .cursor { display: none; }
    }
}

/* ----- motion ---------------------------------------------------- */
@layer motion {
    [data-reveal] {
        opacity: 0;
        transform: translateY(18px);
        transition:
            opacity var(--dur-4) var(--ease-out),
            transform var(--dur-4) var(--ease-out);
        will-change: opacity, transform;
    }
    [data-reveal].is-visible {
        opacity: 1;
        transform: none;
    }
}

/* ----- a11y overrides ------------------------------------------- */
@layer a11y {
    .skip {
        position: absolute;
        left: 1rem;
        top: -3rem;
        padding: 0.5rem 1rem;
        background: var(--ink);
        color: var(--bg);
        border-radius: 6px;
        font-size: 0.875rem;
        font-weight: 500;
        z-index: 100;
        transition: top var(--dur-2) var(--ease-out);
    }
    .skip:focus {
        top: 1rem;
    }

    @media (prefers-reduced-motion: reduce) {
        *, *::before, *::after {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
            scroll-behavior: auto !important;
        }
        [data-reveal] { opacity: 1; transform: none; }
        .cursor { display: none; }
        body { cursor: auto; }
    }
}

/* ----- responsive ----------------------------------------------- */
@media (max-width: 900px) {
    .masthead {
        grid-template-columns: auto 1fr;
        gap: var(--space-4);
    }
    .masthead__nav { display: none; }

    .chapter__head {
        grid-template-columns: auto 1fr;
    }

    .ledger__row {
        grid-template-columns: 3rem 1fr;
    }
    .ledger__meta {
        grid-column: 1 / -1;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        text-align: left;
        padding-top: var(--space-3);
        border-top: 1px dashed var(--ink-line);
    }
    .ledger__warranty { text-align: left; }

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

    .vitals__list { grid-template-columns: 1fr 1fr; gap: var(--space-6); }

    .interview__qa {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .colophon__cols { grid-template-columns: 1fr; gap: var(--space-6); }
    .colophon__bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 1100px) {
    .variants { grid-template-columns: 1fr; max-width: 42rem; margin-inline: auto; }
}

@media (max-width: 560px) {
    .hero__spec { flex-wrap: wrap; justify-content: center; letter-spacing: 0.24em; }
    .variant__row { grid-template-columns: auto 1fr auto auto; }
    .variant__leader { display: none; }
    .ledger__num { display: none; }
    .ledger__row { grid-template-columns: 1fr; }
}