/* About page v5 (20261019): particle portrait, scroll flow, skills board, growing timeline.
   Every selector is scoped under #page-about so the older site-wide rules cannot override it. */

#page-about .ab { --ab-line: var(--studio-line); --ab-blue: var(--studio-blue); --ab-ink: var(--studio-ink); --ab-muted: var(--studio-muted); --ab-ease: cubic-bezier(.22,1,.36,1); --ab-rail-edge: clamp(14px, 2.2vw, 32px); position: relative; padding-block: 120px 96px; }
#page-about .ab-flow-particles { position: fixed; z-index: 7; top: 50%; right: calc(var(--ab-rail-edge) - 22px); left: auto; width: 80px; height: 250px; pointer-events: none; opacity: .78; transform: translateY(-50%); }

/* ---------- Hero ---------- */
#page-about .ab-hero { display: grid; grid-template-columns: minmax(0, .88fr) minmax(0, 1.12fr); align-items: center; gap: clamp(24px, 3.5vw, 56px); min-height: calc(100svh - 140px); padding-block: 24px 56px; }
#page-about .ab-hero__copy { position: relative; z-index: 2; min-width: 0; }
#page-about .ab-eyebrow { display: inline-flex; align-items: center; gap: 12px; margin: 0 0 28px; color: var(--studio-silver); font-size: 14px; line-height: 1.4; letter-spacing: .08em; }
#page-about .ab-eyebrow::before { content: ""; width: 30px; height: 1px; background: var(--studio-silver); opacity: .85; }
#page-about .ab-eyebrow__dot { display: none; }
#page-about .ab-hero__title { margin: 0; color: var(--ab-ink); font-size: clamp(40px, 4.4vw, 60px); font-weight: 600; line-height: 1.18; letter-spacing: -.02em; text-wrap: balance; }
#page-about .ab-hero__name { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 16px; margin: 28px 0 0; }
#page-about .ab-hero__cn { color: var(--ab-ink); font-size: 22px; font-weight: 600; letter-spacing: .04em; }
#page-about .ab-hero__alias { color: var(--ab-muted); font-size: 14px; letter-spacing: .04em; }
#page-about .ab-hero__lead { margin: 18px 0 0; max-width: 32em; color: var(--ab-muted); font-size: 17px; line-height: 1.85; }
#page-about .ab-facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin: 36px 0 0; padding-top: 20px; border-top: 1px solid var(--ab-line); }
#page-about .ab-facts dt { color: var(--ab-muted); font-size: 14px; line-height: 1.5; }
#page-about .ab-facts dd { margin: 6px 0 0; color: var(--ab-ink); font-size: 16px; line-height: 1.5; }
#page-about .ab-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; margin-top: 36px; }
#page-about .ab-jump { display: inline-flex; align-items: center; gap: 12px; min-height: 44px; color: var(--ab-ink); font-size: 16px; text-decoration: none; }
#page-about .ab-jump__line { width: 40px; height: 1px; background: currentColor; transform-origin: left; transition: transform .5s var(--ab-ease); }
#page-about .ab-jump:hover .ab-jump__line, #page-about .ab-jump:focus-visible .ab-jump__line { transform: scaleX(1.6); }

/* Particle portrait */
#page-about .ab-portrait { position: relative; margin: 0; width: 100%; max-width: 760px; justify-self: end; }
#page-about .ab-portrait::before { content: ""; position: absolute; inset: 10% -2% 4% 18%; z-index: -1; background: rgba(111,168,255,.16); filter: blur(56px); pointer-events: none; }
#page-about .ab-portrait__frame { position: relative; aspect-ratio: 3 / 2; overflow: hidden; border: 1px solid var(--ab-line); border-radius: 16px; background: #11151c; }
#page-about .ab-portrait__frame::after { content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none; background: linear-gradient(90deg, rgba(7,11,19,.38), transparent 32%); }
#page-about .ab-portrait__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
#page-about .ab-portrait__particles { position: absolute; inset: 0; z-index: 2; width: 100%; height: 100%; opacity: 1; touch-action: pan-y; }
#page-about .ab-portrait.is-particles .ab-portrait__img { opacity: 1; filter: none; }
#page-about .ab-portrait.is-particles .ab-portrait__particles { opacity: 1; }
#page-about .ab-corner { position: absolute; width: 22px; height: 22px; border-color: var(--studio-silver); border-style: solid; border-width: 0; opacity: .7; pointer-events: none; }
#page-about .ab-corner--tl { top: 16px; left: 16px; border-top-width: 1px; border-left-width: 1px; }
#page-about .ab-corner--tr { top: 16px; right: 16px; border-top-width: 1px; border-right-width: 1px; }
#page-about .ab-corner--bl { bottom: 16px; left: 16px; border-bottom-width: 1px; border-left-width: 1px; }
#page-about .ab-corner--br { bottom: 16px; right: 16px; border-bottom-width: 1px; border-right-width: 1px; }
#page-about .ab-portrait__bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 14px; color: var(--ab-muted); font-size: 14px; line-height: 1.5; }

/* ---------- Sticky in-page navigation ---------- */
#page-about .ab-subnav { position: fixed; top: 50%; right: var(--ab-rail-edge); left: auto; z-index: 8; width: 36px; margin: 0; padding: 0; border: 0; background: transparent; transform: translateY(-50%); }
#page-about .ab-subnav ol { position: relative; display: flex; flex-direction: column; align-items: center; gap: 20px; margin: 0; padding: 0; list-style: none; overflow: visible; }
#page-about .ab-subnav ol::before { content: ""; position: absolute; top: 16px; bottom: 16px; left: 17px; z-index: -1; width: 1px; background: var(--ab-line); }
#page-about .ab-subnav ol::-webkit-scrollbar { display: none; }
#page-about .ab-subnav a { position: relative; display: grid; place-items: center; width: 32px; height: 32px; padding: 0; border: 1px solid rgba(191,204,230,.26); border-radius: 50%; background: rgba(9,11,16,.9); color: transparent; font-size: 0; text-decoration: none; transition: border-color .24s, background .24s, box-shadow .32s var(--ab-ease), transform .24s var(--ab-ease); }
#page-about .ab-subnav a span { color: var(--studio-silver); font-size: 11px; font-variant-numeric: tabular-nums; }
#page-about .ab-subnav a::after { content: attr(data-label); position: absolute; top: 50%; right: 42px; padding: 7px 10px; border: 1px solid var(--ab-line); border-radius: 8px; background: #0b1019; color: var(--ab-ink); font-size: 13px; line-height: 1.2; white-space: nowrap; opacity: 0; pointer-events: none; transform: translate(8px,-50%); transition: opacity .18s, transform .24s var(--ab-ease); }
#page-about .ab-subnav a:hover::after, #page-about .ab-subnav a:focus-visible::after { opacity: 1; transform: translate(0,-50%); }
#page-about .ab-subnav a:hover { border-color: var(--studio-silver); background: #111925; }
#page-about .ab-subnav a[aria-current="true"] { border-color: #9fc4ff; background: #10213a; box-shadow: -5px 0 16px rgba(111,168,255,.34); transform: scale(1.08); }
#page-about .ab-subnav a[aria-current="true"] span { color: #e7f0ff; }
#page-about .ab-subnav__progress { position: absolute; top: 16px; bottom: 16px; left: 17px; width: 1px; border-radius: 2px; background: linear-gradient(180deg, var(--ab-blue), var(--studio-silver)); transform: scaleY(var(--ab-progress, 0)); transform-origin: top; }

/* ---------- Section frame ---------- */
#page-about .ab-section { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: 24px clamp(32px, 5vw, 80px); padding-block: clamp(80px, 10vw, 140px); border-top: 1px solid var(--ab-line); scroll-margin-top: 150px; outline: none; }
#page-about .ab-subnav + .ab-section { margin-top: clamp(48px, 7vw, 96px); }
#page-about .ab-section__head { align-self: start; position: sticky; top: 168px; }
#page-about .ab-index { margin: 0; color: transparent; -webkit-text-stroke: 1px rgba(191, 204, 230, .55); font-size: clamp(56px, 7vw, 104px); font-weight: 200; line-height: 1; font-variant-numeric: tabular-nums; }
#page-about .ab-section__head h2 { margin: 16px 0 0; color: var(--ab-ink); font-size: clamp(26px, 2.6vw, 36px); font-weight: 600; line-height: 1.3; letter-spacing: -.01em; }
#page-about .ab-section__note { margin: 12px 0 0; color: var(--ab-muted); font-size: 15px; line-height: 1.7; }
#page-about .ab-section__body { min-width: 0; }
#page-about .ab-section__lead { margin: 0 0 48px; max-width: 30em; color: var(--ab-ink); font-size: clamp(20px, 2vw, 26px); line-height: 1.6; }

/* 01 Story */
#page-about .ab-statement { margin: 0; color: var(--ab-ink); font-size: clamp(22px, 2.4vw, 34px); font-weight: 500; line-height: 1.65; letter-spacing: -.005em; }
#page-about .ab-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }
#page-about .ab-char { opacity: .2; transition: opacity .35s ease; }
#page-about .ab-char.is-lit { opacity: 1; }
#page-about .ab-story__more { margin: 40px 0 0; max-width: 40em; color: var(--ab-muted); font-size: 17px; line-height: 1.9; }
#page-about .ab-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin: 64px 0 0; padding: 0; list-style: none; }
#page-about .ab-stats li { padding-top: 24px; border-top: 1px solid var(--ab-line); }
#page-about .ab-stats__num { display: block; color: #cfe0ff; font-size: clamp(56px, 6.4vw, 88px); font-weight: 300; line-height: 1; font-variant-numeric: tabular-nums; }
#page-about .ab-stats__label { display: block; margin-top: 14px; color: var(--ab-muted); font-size: 15px; line-height: 1.6; }

/* 02 Method */
#page-about .ab-steps { position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; margin: 0; padding: 0; list-style: none; }
#page-about .ab-steps::before, #page-about .ab-steps::after { content: ""; position: absolute; left: 28px; right: 28px; top: 27px; height: 2px; border-radius: 2px; }
#page-about .ab-steps::before { background: var(--ab-line); }
#page-about .ab-steps::after { background: linear-gradient(90deg, var(--ab-blue), var(--studio-silver)); transform: scaleX(var(--ab-steps, 1)); transform-origin: left; transition: transform 1.6s var(--ab-ease); }
#page-about .ab-step { position: relative; z-index: 1; min-width: 0; }
#page-about .ab-step__node { display: grid; place-items: center; width: 56px; height: 56px; border: 1px solid var(--studio-silver); border-radius: 50%; background: #0b1019; color: var(--ab-ink); font-size: 15px; font-variant-numeric: tabular-nums; transition: border-color .5s, box-shadow .5s, background .5s; }
#page-about .ab-step.is-in .ab-step__node { border-color: var(--ab-blue); background: #10213a; box-shadow: 0 0 0 6px rgba(111, 168, 255, .1), 0 0 28px rgba(111, 168, 255, .35); }
#page-about .ab-step h3 { margin: 28px 0 0; color: var(--ab-ink); font-size: 20px; font-weight: 600; line-height: 1.4; }
#page-about .ab-step p { margin: 10px 0 0; color: var(--ab-muted); font-size: 15px; line-height: 1.75; }

/* 03 Skills */
#page-about .ab-filter-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 28px; }
#page-about .ab-filter { display: flex; flex-wrap: wrap; gap: 8px; }
#page-about .ab-filter button { min-height: 44px; padding: 0 18px; border: 1px solid var(--ab-line); border-radius: 999px; background: transparent; color: var(--ab-muted); font: inherit; font-size: 14px; cursor: pointer; transition: background .3s, color .3s, border-color .3s; }
#page-about .ab-filter button:hover { color: var(--ab-ink); border-color: var(--studio-silver); }
#page-about .ab-filter button[aria-pressed="true"] { background: var(--studio-silver); border-color: var(--studio-silver); color: #0a0e15; }
#page-about .ab-filter__count { margin: 0; color: var(--ab-muted); font-size: 14px; font-variant-numeric: tabular-nums; }
#page-about .ab-tools { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; padding: 0; list-style: none; }
#page-about .ab-tool { --dot: #bfcce6; position: relative; isolation: isolate; display: inline-flex; align-items: center; gap: 12px; min-height: 56px; padding: 12px 22px 12px 18px; overflow: hidden; border: 1px solid var(--ab-line); border-radius: 999px; background: rgba(191, 204, 230, .04); transition: border-color .45s, transform .45s var(--ab-ease), opacity .45s, background .45s, box-shadow .45s; }
#page-about .ab-tool[data-cat="make"] { --dot: #6fa8ff; }
#page-about .ab-tool[data-cat="express"] { --dot: #9fe0ff; }
#page-about .ab-tool[data-cat="ai"] { --dot: #d6e4ff; }
#page-about .ab-tool::before { content: ""; position: absolute; inset: 0; z-index: -1; background: radial-gradient(160px circle at var(--mx, 50%) var(--my, 50%), rgba(111, 168, 255, .3), transparent 70%); opacity: 0; transition: opacity .4s; }
#page-about .ab-tool::after { content: ""; flex: none; order: -1; width: 10px; height: 10px; border-radius: 50%; background: var(--dot); }
#page-about .ab-tool:hover { border-color: rgba(111, 168, 255, .6); transform: translateY(-3px); }
#page-about .ab-tool:hover::before { opacity: 1; }
#page-about .ab-tool__cat { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
#page-about .ab-tool__name { color: var(--ab-ink); font-size: 17px; font-weight: 500; line-height: 1.4; white-space: nowrap; }
#page-about .ab-tools.is-filtered .ab-tool { opacity: .28; transform: scale(.97); }
#page-about .ab-tools.is-filtered .ab-tool.is-match { opacity: 1; transform: translateY(-2px); border-color: var(--dot); background: rgba(111, 168, 255, .1); box-shadow: 0 0 24px -6px var(--dot); }
#page-about .ab-filter button[data-ab-filter]::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; vertical-align: 1px; background: var(--dot, transparent); }
#page-about .ab-filter button[data-ab-filter="all"]::before { display: none; }
#page-about .ab-filter button[data-ab-filter="research"] { --dot: #bfcce6; }
#page-about .ab-filter button[data-ab-filter="make"] { --dot: #6fa8ff; }
#page-about .ab-filter button[data-ab-filter="express"] { --dot: #9fe0ff; }
#page-about .ab-filter button[data-ab-filter="ai"] { --dot: #d6e4ff; }

#page-about .ab-ai { margin-top: 64px; padding: clamp(24px, 3.5vw, 40px); border: 1px solid rgba(111, 168, 255, .3); border-radius: 16px; background: linear-gradient(135deg, rgba(32,73,119,.28), rgba(9,13,20,.72) 52%); }
#page-about .ab-ai__head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 24px; margin-bottom: 28px; }
#page-about .ab-ai__head h3 { margin: 0; color: var(--ab-ink); font-size: clamp(22px, 2.2vw, 28px); font-weight: 600; }
#page-about .ab-ai__head p { margin: 0; max-width: 28em; color: var(--ab-muted); font-size: 15px; line-height: 1.7; }
#page-about .ab-ai__tools { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); margin: 0; padding: 22px 0; border-block: 1px solid var(--ab-line); list-style: none; }
#page-about .ab-ai__tools li { display: grid; grid-template-columns: 42px minmax(0,1fr); gap: 2px 14px; align-items: center; padding: 0 22px; border-right: 1px solid var(--ab-line); }
#page-about .ab-ai__tools li:first-child { padding-left: 0; }
#page-about .ab-ai__tools li:last-child { border-right: 0; }
#page-about .ab-ai__tools li > span { grid-row: 1 / 3; display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid rgba(111,168,255,.45); border-radius: 50%; color: #cfe0ff; font-size: 11px; letter-spacing: .08em; }
#page-about .ab-ai__tools strong { color: var(--ab-ink); font-size: 16px; font-weight: 600; }
#page-about .ab-ai__tools small { color: var(--ab-muted); font-size: 13px; line-height: 1.5; }
#page-about .ab-ai__flow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 28px; margin: 32px 0 0; padding: 0; list-style: none; counter-reset: none; }
#page-about .ab-ai__flow li { position: relative; display: grid; gap: 7px; min-width: 0; }
#page-about .ab-ai__flow li:not(:last-child)::after { content: ""; position: absolute; top: 16px; left: 46px; right: -16px; height: 1px; background: linear-gradient(90deg, rgba(111,168,255,.7), rgba(191,204,230,.2)); }
#page-about .ab-ai__flow span { position: relative; z-index: 1; display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid var(--ab-blue); border-radius: 50%; background: #0c1625; color: #d9e7ff; font-size: 12px; }
#page-about .ab-ai__flow strong { color: var(--ab-ink); font-size: 16px; font-weight: 600; }
#page-about .ab-ai__flow small { max-width: 16em; color: var(--ab-muted); font-size: 13px; line-height: 1.55; }
#page-about .ab-ai__applications { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; margin-top: 32px; }
#page-about .ab-ai__applications article { padding: 20px 22px; border-top: 1px solid var(--ab-line); background: rgba(191,204,230,.025); }
#page-about .ab-ai__applications h4 { margin: 0; color: var(--ab-ink); font-size: 17px; font-weight: 600; }
#page-about .ab-ai__applications p { margin: 9px 0 0; color: var(--ab-muted); font-size: 15px; line-height: 1.75; }
#page-about .ab-ai__grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; }
#page-about .ab-ai__card { position: relative; display: flex; flex-direction: column; min-width: 0; padding: 22px 20px 20px; border: 1px solid var(--ab-line); border-radius: 18px; background: rgba(191, 204, 230, .03); transition: border-color .4s, transform .4s var(--ab-ease), background .4s; }
#page-about .ab-ai__card:hover { transform: translateY(-4px); border-color: rgba(111, 168, 255, .6); background: rgba(111, 168, 255, .07); }
#page-about .ab-ai__card.is-confirmed { border-color: rgba(111, 168, 255, .5); }
#page-about .ab-ai__mono { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(140deg, #1d3a63, #0d1626); border: 1px solid rgba(111, 168, 255, .45); color: #cfe0ff; font-size: 15px; font-weight: 600; }
#page-about .ab-ai__card h4 { margin: 18px 0 0; color: var(--ab-ink); font-size: 20px; font-weight: 600; line-height: 1.3; }
#page-about .ab-ai__maker { margin: 6px 0 0; color: var(--ab-muted); font-size: 14px; line-height: 1.5; }
#page-about .ab-ai__use { flex: 1; margin: 14px 0 18px; color: var(--ab-ink); font-size: 15px; line-height: 1.7; }
#page-about .ab-ai__tag { align-self: flex-start; padding: 4px 12px; border-radius: 999px; background: rgba(111, 168, 255, .18); color: #cfe0ff; font-size: 14px; line-height: 1.5; }
#page-about .ab-ai__tag.is-pending { background: transparent; border: 1px dashed rgba(191, 204, 230, .5); color: var(--ab-muted); }

/* 04 Experience timeline */
#page-about .ab-timeline { --ab-date: 150px; --ab-gap: 56px; position: relative; margin: 0; padding: 0; list-style: none; }
#page-about .ab-timeline::before, #page-about .ab-timeline::after { content: ""; position: absolute; top: 10px; bottom: 10px; left: calc(var(--ab-date) + var(--ab-gap) / 2); width: 2px; margin-left: -1px; border-radius: 2px; }
#page-about .ab-timeline::before { background: var(--ab-line); }
#page-about .ab-timeline::after { background: linear-gradient(180deg, var(--ab-blue), var(--studio-silver)); transform: scaleY(var(--ab-fill, 1)); transform-origin: top; }
#page-about .ab-entry { position: relative; display: grid; grid-template-columns: var(--ab-date) minmax(0, 1fr); column-gap: var(--ab-gap); padding-block: 0 48px; }
#page-about .ab-entry:last-child { padding-bottom: 0; }
#page-about .ab-entry::before { content: ""; position: absolute; z-index: 1; top: 6px; left: calc(var(--ab-date) + var(--ab-gap) / 2 - 7px); width: 14px; height: 14px; border: 2px solid var(--studio-silver); border-radius: 50%; background: #0b1019; transition: border-color .4s, background .4s, box-shadow .4s; }
#page-about .ab-entry.is-passed::before { border-color: var(--ab-blue); background: var(--ab-blue); box-shadow: 0 0 0 5px rgba(111, 168, 255, .15), 0 0 18px rgba(111, 168, 255, .6); }
#page-about .ab-entry__date { margin: 0; padding-top: 2px; color: var(--studio-silver); font-size: 15px; line-height: 1.6; text-align: right; font-variant-numeric: tabular-nums; }
#page-about .ab-entry__body { padding: 0 0 0; transition: transform .4s var(--ab-ease); }
#page-about .ab-entry:hover .ab-entry__body { transform: translateX(6px); }
#page-about .ab-entry h3 { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 0; color: var(--ab-ink); font-size: 22px; font-weight: 600; line-height: 1.4; }
#page-about .ab-entry__now { padding: 2px 10px; border-radius: 999px; background: var(--ab-blue); color: #06101f; font-size: 14px; font-weight: 600; line-height: 1.5; }
#page-about .ab-entry__org { margin: 6px 0 0; color: var(--studio-silver); font-size: 15px; line-height: 1.6; }
#page-about .ab-entry__body > p:not(.ab-entry__org) { margin: 14px 0 0; max-width: 40em; color: var(--ab-muted); font-size: 16px; line-height: 1.8; }
#page-about .ab-entry ul { display: grid; gap: 8px; margin: 16px 0 0; padding: 0; list-style: none; }
#page-about .ab-entry ul li { position: relative; padding-left: 20px; color: var(--ab-muted); font-size: 16px; line-height: 1.75; }
#page-about .ab-entry ul li::before { content: ""; position: absolute; left: 0; top: .8em; width: 8px; height: 1px; background: var(--ab-blue); }
#page-about .ab-entry.is-current .ab-entry__body { padding: 24px; margin-top: -24px; border: 1px solid rgba(111, 168, 255, .35); border-radius: 18px; background: rgba(111, 168, 255, .06); }

/* 05 Learning */
#page-about .ab-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
#page-about .ab-card { padding: 28px 24px; border: 1px solid var(--ab-line); border-radius: 20px; background: rgba(191, 204, 230, .03); transition: border-color .4s, transform .4s var(--ab-ease); }
#page-about .ab-card:hover { border-color: rgba(111, 168, 255, .5); transform: translateY(-3px); }
#page-about .ab-card h3 { margin: 0 0 8px; color: var(--studio-silver); font-size: 18px; font-weight: 600; }
#page-about .ab-card ul { margin: 0; padding: 0; list-style: none; }
#page-about .ab-card li { display: grid; gap: 4px; padding-block: 16px; border-bottom: 1px solid var(--ab-line); }
#page-about .ab-card li:last-child { border-bottom: 0; padding-bottom: 0; }
#page-about .ab-card strong { color: var(--ab-ink); font-size: 16px; font-weight: 500; line-height: 1.6; }
#page-about .ab-card li > span { color: var(--ab-muted); font-size: 15px; line-height: 1.6; }
#page-about .ab-meter { display: flex; gap: 4px; margin-top: 6px; }
#page-about .ab-meter i { width: 28px; height: 4px; border-radius: 4px; background: var(--ab-line); }
#page-about .ab-meter i.on { background: var(--ab-blue); }
#page-about .ab-meter i.half { background: linear-gradient(90deg, var(--ab-blue) 50%, var(--ab-line) 50%); }

/* Closing */
#page-about .ab-closing { position: relative; isolation: isolate; overflow: hidden; margin-top: clamp(40px, 6vw, 80px); padding: clamp(48px, 8vw, 112px) clamp(28px, 6vw, 80px); border: 1px solid var(--ab-line); border-radius: 28px; background: #070b13; }
#page-about .ab-closing::before { content: ""; position: absolute; inset: 0; z-index: -2; background: url("image/KMARE-jellyfish-oblique.webp") right -6% center / auto 135% no-repeat; opacity: .85; }
#page-about .ab-closing::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, #070b13 22%, rgba(7, 11, 19, .7) 52%, rgba(7, 11, 19, .1)); }
#page-about .ab-closing h2 { margin: 0; color: var(--ab-ink); font-size: clamp(32px, 3.6vw, 52px); font-weight: 600; line-height: 1.3; letter-spacing: -.01em; }
#page-about .ab-closing .ab-actions { margin-top: 40px; }

/* Scroll reveal: content is only hidden once the script has confirmed it can reveal it again. */
#page-about .ab.ab-ready [data-ab-reveal] { opacity: 0; transform: translateY(28px); transition: opacity .9s var(--ab-ease), transform .9s var(--ab-ease); }
#page-about .ab.ab-ready [data-ab-reveal].is-in { opacity: 1; transform: none; }
#page-about .ab.ab-ready .ab-step { opacity: 0; transform: translateY(20px); transition: opacity .7s var(--ab-ease), transform .7s var(--ab-ease); }
#page-about .ab.ab-ready .ab-step.is-in { opacity: 1; transform: none; }
#page-about .ab.ab-ready .ab-step:nth-child(2) { transition-delay: .15s; }
#page-about .ab.ab-ready .ab-step:nth-child(3) { transition-delay: .3s; }
#page-about .ab.ab-ready .ab-step:nth-child(4) { transition-delay: .45s; }

/* Focus */
#page-about .ab a:focus-visible, #page-about .ab button:focus-visible { outline: 2px solid var(--ab-blue); outline-offset: 3px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  #page-about .ab-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #page-about .ab-ai__flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #page-about .ab-ai__flow li:nth-child(2)::after { display: none; }
}
@media (max-width: 900px) {
  #page-about .ab-hero { grid-template-columns: minmax(0, 1fr); min-height: 0; padding-top: 8px; }
  #page-about .ab-portrait { justify-self: stretch; max-width: none; }
  #page-about .ab-flow-particles { display: none; }
  #page-about .ab-subnav { position: sticky; top: 72px; right: auto; left: auto; width: 100%; max-width: 100%; margin: 24px auto 0; padding: 6px; border: 1px solid var(--ab-line); border-radius: 16px; background: rgba(9,11,16,.9); backdrop-filter: blur(16px); transform: none; }
  #page-about .ab-subnav ol { flex-direction: row; gap: 4px; overflow-x: auto; }
  #page-about .ab-subnav ol::before { display: none; }
  #page-about .ab-subnav a { display: inline-flex; width: auto; min-width: 56px; height: 44px; padding: 0 14px; border: 0; border-radius: 10px; color: var(--ab-muted); font-size: 14px; white-space: nowrap; }
  #page-about .ab-subnav a::after { display: none; }
  #page-about .ab-subnav a span { margin-right: 6px; }
  #page-about .ab-subnav a[aria-current="true"] { background: var(--studio-silver); color: #0a0e15; box-shadow: none; }
  #page-about .ab-subnav a[aria-current="true"] span { color: #1d3a63; }
  #page-about .ab-subnav__progress { top: auto; right: 14px; bottom: -1px; left: 14px; width: auto; height: 2px; transform: scaleX(var(--ab-progress, 0)); transform-origin: left; }
  #page-about .ab-section { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  #page-about .ab-section__head { position: static; display: flex; align-items: flex-end; flex-wrap: wrap; gap: 4px 20px; }
  #page-about .ab-section__head h2 { margin: 0 0 6px; }
  #page-about .ab-section__note { flex-basis: 100%; }
  #page-about .ab-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 40px; }
  #page-about .ab-steps::before, #page-about .ab-steps::after { display: none; }
}
@media (max-width: 768px) {
  #page-about .ab { padding-block: 96px 64px; }
  #page-about .ab-facts { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  #page-about .ab-facts div { display: flex; gap: 16px; }
  #page-about .ab-facts dd { margin: 0; }
  #page-about .ab-stats { grid-template-columns: minmax(0, 1fr); gap: 0; margin-top: 48px; }
  #page-about .ab-stats li { display: flex; align-items: baseline; gap: 20px; padding-block: 20px; }
  #page-about .ab-stats__label { margin: 0; }
  #page-about .ab-timeline { --ab-date: 0px; --ab-gap: 0px; padding-left: 32px; }
  #page-about .ab-timeline::before, #page-about .ab-timeline::after { left: 7px; }
  #page-about .ab-entry { grid-template-columns: minmax(0, 1fr); row-gap: 6px; }
  #page-about .ab-entry::before { left: -32px; top: 4px; }
  #page-about .ab-entry__date { text-align: left; padding: 0; }
  #page-about .ab-entry.is-current .ab-entry__body { padding: 18px; margin-top: 8px; }
  #page-about .ab-cards, #page-about .ab-ai__applications { grid-template-columns: minmax(0, 1fr); }
  #page-about .ab-ai__tools { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  #page-about .ab-ai__tools li { padding: 0 0 16px; border-right: 0; border-bottom: 1px solid var(--ab-line); }
  #page-about .ab-ai__tools li:last-child { padding-bottom: 0; border-bottom: 0; }
  #page-about .ab-closing::before { background-position: center bottom; background-size: 150% auto; opacity: .45; }
  #page-about .ab-closing::after { background: linear-gradient(180deg, #070b13 30%, rgba(7, 11, 19, .55)); }
}
@media (max-width: 480px) {
  #page-about .ab { width: calc(100% - 40px); }
  #page-about .ab-hero__copy, #page-about .ab-hero__lead { min-width: 0; width: 100%; max-width: 100%; }
  #page-about .ab-hero__title { font-size: 33px; text-wrap: initial; }
  #page-about .ab-hero__lead, #page-about .ab-facts dd { overflow-wrap: anywhere; }
  #page-about .ab-actions { display: grid; grid-template-columns: minmax(0, 1fr); justify-items: start; gap: 12px; }
  #page-about .ab-actions .studio-button, #page-about .ab-jump { max-width: 100%; }
  #page-about .ab-jump__line { width: 32px; }
  #page-about .ab-steps { grid-template-columns: minmax(0, 1fr); row-gap: 28px; }
  #page-about .ab-ai__flow { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  #page-about .ab-ai__flow li::after { display: none !important; }
  #page-about .ab-tool { min-height: 48px; padding: 10px 16px 10px 14px; gap: 10px; }
  #page-about .ab-tool__name { font-size: 15px; }
  #page-about .ab-portrait__bar { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  #page-about .ab *, #page-about .ab *::before, #page-about .ab *::after { animation: none !important; transition: none !important; }
  #page-about .ab-flow-particles { opacity: .42; }
  #page-about .ab.ab-ready [data-ab-reveal], #page-about .ab.ab-ready .ab-step { opacity: 1; transform: none; }
  #page-about .ab-char { opacity: 1; }
  #page-about .ab-tool:hover, #page-about .ab-ai__card:hover, #page-about .ab-card:hover, #page-about .ab-entry:hover .ab-entry__body { transform: none; }
}
@media (forced-colors: active) {
  #page-about .ab-index { color: CanvasText; -webkit-text-stroke: 0; }
  #page-about .ab-char { opacity: 1; }
}