/* Dialectic Skills project page.
   Direction: one motif. The mark of dia (two circles and the lens where they meet) runs the page:
   the hero, every picture frame, the speaker dots, the round buttons and the footer. */

@font-face { font-family: 'Libre Franklin'; font-style: normal; font-weight: 700; font-display: swap; src: url(fonts/libre-franklin.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Source Serif 4'; font-style: normal; font-weight: 400 600; font-display: swap; src: url(fonts/source-serif-4.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }
@font-face { font-family: 'Source Serif 4'; font-style: italic; font-weight: 400; font-display: swap; src: url(fonts/source-serif-4-italic.woff2) format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

/* ---------- tokens ---------- */
:root {
  --sky: #cbe4f2;
  --sky-tone: #b6d7ea;
  --sand: #f1e3b5;
  --sand-tone: #e7d49a;
  --ink: #0a0a0a;
  --paper: #f2f2f2;
  --muted: #3c5866;
  --accent: #f59e0b;            /* the lens of the dia mark */
  --accent-strong: #e08a00;
  --accent-ink: #0a0a0a;
  --blue-1: #0e2a3a;
  --blue-2: #1b4660;
  --blue-3: #2c6688;
  --blue-4: #6fa3c3;
  --blue-5: #a3cbe2;

  --bg: var(--sky);
  --tone: var(--sky-tone);
  --pair-b: var(--sand);

  --font-display: 'Libre Franklin', 'Helvetica Neue', Arial, sans-serif;
  --font-text: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-code: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace; /* taste-skill-ignore: used only by code and pre (commands and prompts) */

  --step-small: clamp(0.8125rem, 0.79rem + 0.1vw, 0.875rem);
  --step-body: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  --step-lead: clamp(1.375rem, 1rem + 1.1vw, 1.875rem);
  --step-head: clamp(2rem, 1.3rem + 3.2vw, 4rem);
  --step-display: clamp(2.75rem, 0.6rem + 9vw, 6.75rem);

  --margin: clamp(1rem, 2.2vw, 2rem);
  --gutter: clamp(1rem, 2vw, 2rem);
  --pad: clamp(3.5rem, 6vw, 5.5rem);
  --radius: 28px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.76, 0, 0.24, 1);
  --ease-soft: cubic-bezier(0.33, 1, 0.68, 1);
  --t-press: 140ms;
  --t-hover: 180ms;
  --t-ui: 240ms;
  --t-reveal: 800ms;
  --stagger-item: 70ms;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { margin: 0; background: var(--sky); color: var(--ink); font-family: var(--font-text); font-size: var(--step-body); line-height: 1.55; font-kerning: normal; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
h1, h2, h3, p, figure, ol, ul, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, video, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; }
:target { scroll-margin-top: 2rem; }
::selection { background: var(--accent); color: var(--accent-ink); }
:focus-visible { outline: 3px solid var(--focus, var(--ink)); outline-offset: 3px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; text-wrap: balance; }
.display { font-size: var(--step-display); line-height: 0.92; letter-spacing: -0.035em; text-transform: uppercase; }
.head { font-size: var(--step-head); line-height: 1.02; letter-spacing: -0.03em; }
.lead { font-size: var(--step-lead); line-height: 1.3; }
.small { font-size: var(--step-small); line-height: 1.45; }
.mask { overflow: clip; padding-bottom: 0.1em; margin-bottom: -0.1em; }
.mask > span { display: block; }
p { max-width: 64ch; }
p, li, dd, dt, figcaption, summary { text-wrap: pretty; }
code, pre { font-family: var(--font-code); font-size: 0.86em; }
pre code { font-size: 1em; }
i { font-style: italic; }
strong { font-weight: 600; }

.wrap { padding-inline: var(--margin); }
.field-sand { --bg: var(--sand); --tone: var(--sand-tone); --pair-b: var(--sky); background: var(--sand); }

/* ---------- controls ---------- */
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 3.25rem; padding: 0 1.6rem; border-radius: 999px; background: var(--accent); color: var(--accent-ink); font-family: var(--font-display); font-weight: 700; font-size: var(--step-body); letter-spacing: -0.01em; text-decoration: none; white-space: nowrap; transition: transform var(--t-press) var(--ease-out), background-color var(--t-hover) ease, color var(--t-hover) ease; }
.button:active { transform: scale(0.96); }
.button--ink { background: var(--ink); color: var(--paper); }
.button--tone { background: var(--tone); color: var(--ink); }
.button--small { min-height: 2.75rem; padding: 0 1.25rem; }
.link { text-decoration: underline; text-decoration-color: transparent; text-underline-offset: 0.22em; text-decoration-thickness: 0.08em; transition: text-decoration-color var(--t-hover) ease; }
.link--plain, .link-plain { text-decoration: underline; text-underline-offset: 0.2em; text-decoration-thickness: 0.07em; transition: text-decoration-color var(--t-hover) ease; }
@media (hover: hover) and (pointer: fine) {
  .button:hover { background: var(--accent-strong); }
  .button--ink:hover { background: var(--blue-1); }
  .button--tone:hover { background: var(--ink); color: var(--paper); }
  .link:hover { text-decoration-color: currentColor; }
  .link--plain:hover, .link-plain:hover { text-decoration-color: var(--accent-strong); }
}

/* ---------- the motif: two circles and the lens ---------- */
.pair { position: relative; }
.pair__art { position: relative; aspect-ratio: 3 / 2; }
.pair__a, .pair__b { position: absolute; top: 0; width: 66.667%; height: 100%; border-radius: 50%; }
.pair__a { left: 0; object-fit: cover; filter: grayscale(1) contrast(1.06) brightness(var(--lift, 1)); background: var(--tone); }
.pair__b { left: 33.333%; background: var(--pair-b); }
.pair__lens { position: absolute; inset: 0; width: 100%; height: 100%; mix-blend-mode: multiply; pointer-events: none; }
.pair__lens path { fill: var(--accent); }
.pair figcaption { margin-top: 1rem; color: var(--muted); max-width: 46ch; }

.pair--diag .pair__art { aspect-ratio: 1; }
.pair--diag .pair__a, .pair--diag .pair__b { width: 73.87%; height: 73.87%; }
.pair--diag .pair__a { left: 0; top: 0; }
.pair--diag .pair__b { left: 26.13%; top: 26.13%; }
.pair--diag.pair--flip .pair__a { left: 26.13%; }
.pair--diag.pair--flip .pair__b { left: 0; }

.m-a { fill: var(--sand); }
.m-b { fill: var(--ink); }
.m-lens { fill: var(--accent); }

.dot { flex: none; width: 1rem; height: 1rem; border-radius: 50%; background: var(--ink); }

/* ---------- hero ---------- */
.hero { position: relative; min-height: 100svh; overflow: clip; --pair-b: var(--ink); --tone: var(--sky-tone); }
.nav { position: absolute; z-index: 3; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; align-items: center; padding: 1.25rem var(--margin); font-family: var(--font-display); font-weight: 700; }
.wordmark { display: inline-flex; align-items: center; gap: 0.6rem; font-size: var(--step-lead); letter-spacing: -0.03em; text-decoration: none; }
.wordmark__mark { width: 2.4rem; height: 1.6rem; }
.nav__links { display: flex; gap: clamp(1rem, 2.4vw, 2.25rem); font-size: var(--step-body); }
.nav__links a { display: inline-block; padding-block: 0.6rem; }

.hero__copy { position: relative; z-index: 2; min-height: 100svh; width: min(50%, 46rem); display: flex; flex-direction: column; justify-content: center; padding: 7rem var(--margin) 5rem; }
.hero__lead { margin-top: 2.25rem; max-width: 24em; }
.hero .display { font-size: min(var(--step-display), calc((min(50vw, 46rem) - 2 * var(--margin)) / 5.4)); }
.hero__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.75rem; margin-top: 2.25rem; }
.lines .line { display: block; overflow: hidden; padding-bottom: 0.08em; margin-bottom: -0.08em; }
.lines [data-line] { display: block; }

.hero__pair { --R: min(40svh, 27vw); position: absolute; z-index: 1; width: calc(var(--R) * 3); left: calc(100% - var(--margin) - var(--R) * 2); top: calc(54% - var(--R)); }
.hero__pair .pair__a { object-position: 50% 22%; }
.hero__pair figcaption { position: absolute; left: 0; top: calc(100% + 0.75rem); width: calc(var(--R) * 2); }
@media (min-width: 900px) and (max-width: 1239.98px) { .hero__pair { --R: min(40svh, 24vw); } }

/* ---------- intro ---------- */
.intro { padding-block: var(--pad); }
.intro__title { margin-bottom: 2.5rem; }
.statement { font-size: var(--step-lead); line-height: 1.3; max-width: 32em; font-weight: 400; }
.thumb { display: inline-block; vertical-align: -0.32em; width: 1.4em; height: 1.4em; margin-inline: 0.14em; border-radius: 50%; object-fit: cover; filter: grayscale(1) contrast(1.06); background: var(--tone); }
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gutter); margin-top: clamp(3rem, 6vw, 5rem); }
.fact { max-width: 36ch; }
.fact__title { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em; }

/* ---------- skills ---------- */
.skills__head { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); row-gap: 2.5rem; padding-block: var(--pad); }
.skills__intro { grid-column: 1 / span 5; }
.skills__intro p { margin-top: 1.5rem; }
.wants { grid-column: 7 / -1; align-self: end; }
.wants a { display: flex; align-items: baseline; gap: 0.75rem; min-height: 2.75rem; padding-block: 0.45rem; text-decoration: none; }
/* The dot sits on the first line of the goal, also when the goal wraps (and, on phones, when the name drops below it). */
.wants .dot { align-self: flex-start; margin-top: calc((1.55em - 1rem) / 2); background: var(--accent); }
.wants__goal { flex: 1; }
.wants code { flex: none; color: var(--ink); font-size: var(--step-body); font-variant-numeric: tabular-nums; }
@media (hover: hover) and (pointer: fine) {
  .wants a .wants__goal { text-decoration: underline; text-decoration-color: transparent; text-underline-offset: 0.22em; transition: text-decoration-color var(--t-hover) ease; }
  .wants a:hover .wants__goal { text-decoration-color: currentColor; }
}

.switch { display: none; }
.js .switch { display: block; position: sticky; top: 0; z-index: 5; background: var(--ink); color: var(--paper); --focus: var(--accent); }
.switch__in { display: flex; align-items: center; gap: 0.5rem 1.25rem; min-height: 3.75rem; padding: 0.5rem var(--margin); font-family: var(--font-display); font-weight: 700; }
.switch__label { flex: none; }
.switch .surfaces { flex: 1; gap: 0.25rem; }
.switch .surface { padding: 0 0.9rem; border-radius: 999px; color: var(--blue-5); }
.switch .surface::before { display: none; }
.switch .surface[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
@media (hover: hover) and (pointer: fine) { .switch .surface:not([aria-pressed="true"]):hover { color: var(--paper); } }
.switch__pick { display: none; align-items: center; gap: 0.6rem; flex: 1; min-width: 0; }
.switch__select { appearance: none; -webkit-appearance: none; flex: 1; min-width: 0; max-width: 15rem; min-height: 2.75rem; padding: 0 2.4rem 0 1rem; border: 0; border-radius: 999px; font: inherit; color: var(--accent-ink); background: var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%230a0a0a' stroke-width='2'/%3E%3C/svg%3E") no-repeat right 1rem center / 0.75rem; cursor: pointer; }
.switch__go { flex: none; margin-left: auto; }

.plate { scroll-margin-top: 1rem; }
.plate { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: calc(var(--gutter) * 2); align-items: start; min-height: 88svh; padding: var(--pad) var(--margin); background: var(--bg); }
.plate__pic { position: sticky; top: max(8svh, 5.5rem); padding-inline: clamp(0rem, 2vw, 2.5rem); }
.plate--flip .plate__pic { order: 2; }
.plate__text { display: flex; flex-direction: column; gap: 1.5rem; max-width: 42rem; }
.plate__name { margin-top: 0; }
.plate__text > .lead { margin-top: -0.5rem; }

.surfaces { display: flex; flex-wrap: wrap; gap: 0 1.1rem; font-family: var(--font-display); font-weight: 700; }
.surfaces:empty { display: none; }
.surface { display: inline-flex; align-items: center; gap: 0.45rem; min-height: 2.75rem; color: var(--muted); transition: color var(--t-hover) ease; }
.surface::before { content: ""; flex: none; width: 0.6rem; height: 0.6rem; border-radius: 50%; background: var(--tone); transform: scale(0.75); transition: background-color var(--t-ui) ease, transform var(--t-ui) var(--ease-out); }
.surface[aria-pressed="true"] { color: var(--ink); }
.surface[aria-pressed="true"]::before { transform: none; background: var(--accent); }
@media (hover: hover) and (pointer: fine) { .surface:hover { color: var(--ink); } }

.start { display: flex; flex-wrap: wrap; gap: 0.35rem 0.6rem; align-items: baseline; }
.plate__text p code { white-space: nowrap; }
.start__how { flex-basis: 100%; }
.start__code { display: inline-block; padding: 0.2em 0.7em; border-radius: 999px; background: var(--tone); color: var(--ink); font-size: 1em; }
.start__note { flex-basis: 100%; color: var(--muted); }
.start__note:empty { display: none; }
.start__code.is-new { animation: pop 420ms var(--ease-out); }
@keyframes pop { from { transform: translateY(6px); opacity: 0.2; } to { transform: none; opacity: 1; } }

pre { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.5; }
.try pre { padding: 1.1rem 1.4rem; border-radius: var(--radius); background: var(--tone); font-family: var(--font-text); font-size: 1em; line-height: 1.45; }
.try code { font-family: inherit; }
.try__label { font-family: var(--font-display); font-weight: 700; margin-bottom: 0.4rem; }
.skip { position: absolute; left: var(--margin); top: 0.75rem; z-index: 100; padding: 0.7rem 1.2rem; border-radius: 999px; background: var(--ink); color: var(--paper); font-family: var(--font-display); font-weight: 700; transform: translateY(-200%); }
.skip:focus { transform: none; }
#main:focus { outline: none; }

.talk { display: grid; gap: 0.9rem; }
.talk__turn { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); column-gap: 1rem; }
.talk__turn b { display: flex; align-items: center; gap: 0.5rem; align-self: start; font-family: var(--font-display); font-weight: 700; line-height: 1.55; }
.talk__turn b::before { content: ""; flex: none; width: 0.75rem; height: 0.75rem; border-radius: 50%; background: var(--ink); }
.talk__turn.is-you b::before { background: var(--blue-3); }
.talk__turn.is-gap { color: var(--muted); }

.output { display: grid; gap: 0.3rem; }
.output dt { font-family: var(--font-display); font-weight: 700; margin-top: 0.6rem; }
.output dt:first-child { margin-top: 0; }

.plate__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 0.5rem; }
/* The session or output sits behind a native disclosure, closed by default, so a plate reads in one screen.
   The toggle is a pill like the buttons, with the plus/minus of the question tiles; open, it turns amber. */
.session > summary { position: relative; display: flex; align-items: center; width: fit-content; min-height: 3.25rem; padding: 0 3.6rem 0 1.6rem; border-radius: 999px; background: var(--tone); color: var(--ink); list-style: none; cursor: pointer; font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em; transition: transform var(--t-press) var(--ease-out), background-color var(--t-hover) ease, color var(--t-hover) ease; }
.session > summary::-webkit-details-marker { display: none; }
.session > summary:active { transform: scale(0.96); }
.session > summary::before, .session > summary::after { content: ""; position: absolute; right: 1.5rem; top: 50%; width: 0.9rem; height: 3px; margin-top: -1.5px; border-radius: 999px; background: currentColor; transition: transform var(--t-ui) var(--ease-out); }
.session > summary::after { transform: rotate(90deg); }
.session[open] > summary { background: var(--accent); color: var(--accent-ink); }
.session[open] > summary::after { transform: rotate(0deg); }
.session__body { display: grid; gap: 1.5rem; padding-top: 1.75rem; }
/* Closed means not laid out at all: Chrome's native closed state only skips painting, and the skipped session still
   reports geometry over the next plate to layout probes. The cost is that find-in-page no longer opens a session. */
.session:not([open]) > .session__body { display: none; }
@media (hover: hover) and (pointer: fine) { .session:not([open]) > summary:hover { background: var(--ink); color: var(--paper); } }

/* ---------- install ---------- */
.install { padding-block: var(--pad); }
.install__intro { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: start; }
.install__intro h2 { grid-column: 1 / span 5; }
.install__intro p { grid-column: 7 / -1; }
.stages { margin-top: 4rem; border-radius: var(--radius); overflow: clip; }
.stage { background: var(--stage); color: var(--stage-ink); --focus: var(--stage-ink); }
.stage__name { font-size: var(--step-lead); letter-spacing: -0.02em; line-height: 1.15; }
.stage__btn { display: block; width: 100%; text-align: left; padding: 1.5rem 2rem 0; font-weight: 700; }
.stage__body { padding: 1.5rem 2rem 2.25rem; }
.steps { list-style: decimal; padding-left: 1.4em; display: grid; gap: 1rem; max-width: 46rem; }
.steps li::marker { font-family: var(--font-display); font-weight: 700; }
.code { position: relative; margin-block: 0.6rem; display: flex; flex-wrap: wrap; align-items: stretch; gap: 0.5rem; }
.code pre { flex: 1 1 15rem; padding: 0.9rem 1.2rem; border-radius: var(--radius); background: color-mix(in srgb, var(--stage-ink) 8%, transparent); }
.copy { flex: none; min-width: 5.5rem; min-height: 2.75rem; padding: 0 1.1rem; border-radius: 999px; background: var(--stage-ink); color: var(--stage); font-family: var(--font-display); font-weight: 700; font-size: var(--step-small); transition: transform var(--t-press) var(--ease-out), opacity var(--t-hover) ease; }
.copy:active { transform: scale(0.95); }
.notes { display: grid; gap: 0.6rem; margin-top: 1.5rem; max-width: 46rem; }
.notes li { position: relative; padding-left: 1.4em; }
.notes li::before { content: ""; position: absolute; left: 0; top: 0.55em; width: 0.6em; height: 0.6em; border-radius: 50%; background: currentColor; }
.stage code { overflow-wrap: break-word; }
.nobr { white-space: nowrap; }

@media (min-width: 900px) {
  .js .stages { display: flex; min-height: 600px; }
  .js .stage { position: relative; flex: 1 1 0; min-width: 0; }
  .js .stage.is-open { flex: 0 0 60%; }
  .js .stage:not(.is-open) .stage__body { display: none; }
  .js .stage:not(.is-open) .stage__btn { position: absolute; inset: 0; padding: 0; }
  .js .stage:not(.is-open) .stage__btn span { position: absolute; left: 1.1rem; top: 1.5rem; writing-mode: vertical-rl; white-space: nowrap; font-size: var(--step-body); }
  .js .stage.is-open .stage__btn { cursor: default; }
  @media (hover: hover) and (pointer: fine) {
    .js .stage:not(.is-open) .stage__btn span { transition: transform var(--t-ui) var(--ease-out); }
    .js .stage:not(.is-open) .stage__btn:hover span { transform: translateY(0.4rem); }
  }
}
@media (max-width: 899.98px) {
  .js .stage:not(.is-open) .stage__body { display: none; }
  .js .stage__btn { position: relative; min-height: 4rem; padding: 1.1rem 3.75rem 1.1rem 1.25rem; font-size: var(--step-body); }
  .js .stage:not(.is-open) .stage__btn::before, .js .stage:not(.is-open) .stage__btn::after { content: ""; position: absolute; right: 1.5rem; top: 50%; width: 1rem; height: 3px; margin-top: -1.5px; border-radius: 999px; background: currentColor; }
  .js .stage:not(.is-open) .stage__btn::after { transform: rotate(90deg); }
  .js .stage.is-open .stage__btn { font-size: var(--step-lead); padding-top: 1.5rem; }
  .stage__body { padding: 0.75rem 1.25rem 1.75rem; }
}

/* ---------- invoke ---------- */
.invoke { padding-block: var(--pad); }
.invoke__grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: start; }
.invoke__list { grid-column: 1 / span 6; }
.invoke__list > p { margin-top: 1.5rem; }
.rows__group { font-size: var(--step-body); color: var(--muted); margin-top: 2.5rem; margin-bottom: 0.4rem; }
.rows li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.25rem 0.75rem; min-height: 2.75rem; padding-block: 0.45rem; }
.rows .dot { align-self: flex-start; margin-top: calc((1.55em - 0.75rem) / 2); width: 0.75rem; height: 0.75rem; background: var(--blue-3); }
.rows__name { flex: 1 1 14rem; }
.rows__value { display: flex; flex-wrap: wrap; gap: 0.35rem 0.75rem; justify-content: flex-end; text-align: right; font-variant-numeric: tabular-nums; }
.invoke__note { margin-top: 2.5rem; }
.invoke__note code, .rows__name code { white-space: nowrap; }
.invoke__film { grid-column: 8 / -1; position: sticky; top: 12svh; --pair-b: var(--sky); }
.invoke__film .pair__a { object-position: 46% 50%; }
.film__caption { display: flex; align-items: center; gap: 0.75rem; }
.film__toggle { flex: none; min-height: 2.75rem; padding: 0 1.1rem; border-radius: 999px; background: var(--tone); color: var(--ink); font-family: var(--font-display); font-weight: 700; font-size: var(--step-small); transition: background-color var(--t-hover) ease, color var(--t-hover) ease; }
@media (hover: hover) and (pointer: fine) { .film__toggle:hover { background: var(--ink); color: var(--paper); } }

/* ---------- questions ---------- */
.faq { padding-block: var(--pad); }
.faq__grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); align-items: start; }
.faq__head { grid-column: 1 / span 4; position: sticky; top: 6rem; }
.faq__head p { margin-top: 1.5rem; }
.faq__list { grid-column: 5 / -1; display: grid; gap: 0.5rem; }
.tile { border-radius: var(--radius); background: var(--tone); transition: background-color var(--t-ui) ease; }
.tile summary { position: relative; display: flex; align-items: center; min-height: 4.5rem; padding: 1.1rem 4.5rem 1.1rem 1.6rem; list-style: none; cursor: pointer; font-family: var(--font-display); font-weight: 700; font-size: var(--step-body); letter-spacing: -0.01em; }
.tile summary::-webkit-details-marker { display: none; }
.tile summary code { white-space: nowrap; }
.tile summary::before, .tile summary::after { content: ""; position: absolute; right: 1.75rem; top: 50%; width: 1rem; height: 3px; margin-top: -1.5px; border-radius: 999px; background: currentColor; transition: transform var(--t-ui) var(--ease-out); }
.tile summary::after { transform: rotate(90deg); }
.tile[open] { background: var(--accent); color: var(--accent-ink); }
.tile[open] summary::after { transform: rotate(0deg); }
.tile__body { padding: 0 1.6rem 1.5rem; }
/* Closed tiles are not laid out, like closed sessions: the last tile's hidden answer otherwise reports geometry
   above the footer word mark, where layout probes read it as an eyebrow. */
.tile:not([open]) > .tile__body { display: none; }
.tile__body p { max-width: 52ch; }
@media (hover: hover) and (pointer: fine) { .tile:not([open]) summary:hover { background: color-mix(in srgb, var(--ink) 6%, transparent); border-radius: var(--radius); } }

/* ---------- footer ---------- */
.footer { background: var(--ink); color: var(--paper); padding-block: var(--pad) 2rem; --focus: var(--accent); }
.footer .m-a { fill: var(--sand); }
.footer .m-b { fill: var(--sky); }
.footer .m-lens { fill: var(--accent); stroke: var(--ink); stroke-width: 4px; vector-effect: non-scaling-stroke; }
.footer__mark { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--gutter); }
.footer__pair { width: auto; height: clamp(9rem, 34svh, 22rem); aspect-ratio: 3 / 2; }
.footer__word { font-family: var(--font-display); font-weight: 700; font-size: var(--step-display); line-height: 0.92; letter-spacing: -0.035em; text-transform: uppercase; text-align: right; max-width: none; }
.footer__cols { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); row-gap: 2rem; margin-top: 3.5rem; }
.footer__links { grid-column: span 2; display: grid; gap: 0.25rem; align-content: start; }
.footer__links a { display: inline-block; padding-block: 0.35rem; }
.footer__credits { grid-column: 7 / -1; color: var(--paper); font-size: var(--step-small); }
.footer__credits a { text-underline-offset: 0.2em; }
.footer__last { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 1rem; margin-top: 3rem; }
.footer .button { background: var(--accent); color: var(--accent-ink); }

/* ---------- phone and tablet ---------- */
@media (max-width: 899.98px) {
  .hero { display: flex; flex-direction: column; min-height: 100svh; }
  .hero__copy { width: 100%; min-height: 0; justify-content: flex-start; padding: max(6rem, 15svh) var(--margin) 2.5rem; }
  .hero .display { font-size: var(--step-display); }
  .hero__pair { --R: 33vw; position: relative; left: auto; top: auto; flex: none; align-self: center; margin: auto 0 calc(var(--R) * -0.4); }
  .hero__pair figcaption { display: none; }
  .skills__intro, .wants, .install__intro h2, .install__intro p, .invoke__list, .invoke__film, .faq__head, .faq__list { grid-column: 1 / -1; }
  .install__intro p { margin-top: 1.5rem; }
  .switch__label, .switch .surfaces { display: none; }
  .switch__pick { display: flex; }
  .invoke__film { position: relative; top: 0; margin-top: 3rem; }
  .faq__head { position: static; margin-bottom: 2rem; }
  .plate { grid-template-columns: 1fr; row-gap: 1.5rem; }
  .plate__text { display: contents; }
  .plate__name { order: 1; margin-top: 0; }
  .plate__text > .lead { order: 2; margin-top: -0.75rem; }
  .plate__pic, .plate--flip .plate__pic { order: 3; margin-block: 1rem; }
  .plate__text > :not(.plate__name):not(.lead) { order: 4; }
  .plate__text > :not(p) { max-width: 42rem; }
  .plate__pic { position: relative; top: 0; padding-inline: 0; width: min(64%, 30rem); }
  .plate--flip .plate__pic { justify-self: end; }
  .plate--flip .plate__pic figcaption { margin-left: auto; text-align: right; }
  .facts { grid-template-columns: 1fr; gap: 2rem; }
  .footer__links { grid-column: span 4; }
  .footer__credits { grid-column: 1 / -1; }
}
@media (max-width: 599.98px) {
  .plate__pic { width: 58%; }
  .nav__wide { display: none; }
  .hero__copy { padding-top: 15svh; }
  .hero__pair { --R: 43.3vw; }
  .talk__turn { grid-template-columns: 1fr; row-gap: 0.15rem; }
  .talk__turn.is-gap > span { display: none; }
  .rows__value { flex-basis: 100%; justify-content: flex-start; text-align: left; padding-left: 1.5rem; }
  .footer__links { grid-column: 1 / -1; }
  .footer__mark { flex-direction: column; align-items: flex-start; gap: 1.5rem; }
  .footer__word { text-align: left; }
  .footer__pair { height: auto; width: 100%; }
  .wants a { flex-wrap: wrap; }
  .wants code { flex-basis: 100%; padding-left: 1.75rem; }
  .switch__in { gap: 0.5rem 0.75rem; }
  .switch__more { display: none; }
  .switch__select { font-size: 0.9375rem; padding: 0 2.1rem 0 0.9rem; background-position: right 0.85rem center; }
}

/* ---------- motion (content stays visible without JavaScript and under reduced motion) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js .hero [data-line] { transform: translateY(105%); animation: line-up 900ms var(--ease-expo) forwards; animation-delay: calc(120ms + var(--i) * 110ms); }
  .js .hero [data-load] { opacity: 0; transform: translateY(14px); animation: rise 600ms var(--ease-out) forwards; animation-delay: var(--d); }
  .js .hero [data-open] .pair__art { clip-path: inset(0 0 0 100%); animation: shutter 1100ms var(--ease-in-out) 150ms forwards; }
  .js .hero [data-open] .pair__a { transform: scale(1.12); animation: settle 1500ms var(--ease-soft) 150ms forwards; }
  .js .hero [data-open] figcaption { opacity: 0; animation: rise 600ms var(--ease-out) 1000ms forwards; }

  .js [data-reveal] { transform: translateY(28px); transition: transform 900ms var(--ease-expo); transition-delay: calc(var(--i, 0) * var(--stagger-item)); }
  .js [data-reveal].is-in { transform: none; }
  .js .mask[data-reveal] { transform: none; }
  .js .mask[data-reveal] > span { transform: translateY(108%); transition: transform 900ms var(--ease-expo); transition-delay: calc(var(--i, 0) * var(--stagger-item)); }
  .js .mask[data-reveal].is-in > span { transform: none; }
  .js .pair[data-reveal] { transform: none; }
  .js .pair[data-reveal] .pair__a { transform: scale(0.9); transition: transform 1100ms var(--ease-expo); }
  .js .pair[data-reveal] .pair__b { transform: translate(-8%, -8%); transition: transform 1100ms var(--ease-expo) 80ms; }
  .js .pair--flip[data-reveal] .pair__b { transform: translate(8%, -8%); }
  .js .invoke__film[data-reveal] .pair__b { transform: translateX(-12%); }
  .js .pair[data-reveal].is-in .pair__a, .js .pair[data-reveal].is-in .pair__b { transform: none; }

  .tile[open] .tile__body { animation: rise 420ms var(--ease-out); }
  .session[open] .session__body { animation: rise 420ms var(--ease-out); }
  .js .stage.is-open .stage__body { animation: rise 500ms var(--ease-out); }
}
@keyframes line-up { to { transform: none; } }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes shutter { to { clip-path: inset(0 0 0 0); } }
@keyframes settle { to { transform: none; } }