/* ==========================================================================
   DIGIFUND home v2 (index.html)
   A dark, hairline-framed page: warm near-black, off-white type, one blue.
   Display: Be Vietnam Pro · Text: Geist · Data: Geist Mono
   ========================================================================== */

:root {
    --bg: #0e0d0c;
    --bg-2: #141210;
    --bg-3: #1c1917;
    --line: rgba(var(--ink-rgb), 0.08);
    --line-2: rgba(var(--ink-rgb), 0.14);
    --text: #f5f4f2;
    --muted: #a6a09b;
    --dim: #8d857f;
    --accent: #3b82f6;
    --accent-ink: #7fb0ff;
    --ink-rgb: 245, 240, 235;        /* hairlines, faint fills */
    --scrim-rgb: 14, 13, 12;         /* photo washes, glass bars */
    --word-dim: #4a4540;             /* unread words in statements */
    --strong: #fff;
    --btn-bg: #f5f4f2; --btn-ink: #0e0d0c; --btn-hover: #fff;
    --thumb: #3a3530;
    --card: rgba(20, 18, 16, 0.86);
    --shadow: rgba(0, 0, 0, 0.85);
    --display: "Be Vietnam Pro", "Geist", system-ui, sans-serif;
    --sans: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
    --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
    --gutter: clamp(20px, 3.6vw, 52px);
    --hdr: 64px;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    color-scheme: dark;
}
:root[data-theme="light"] {
    /* white + DIGIFUND blue: cool white ground, navy ink, blue accents */
    --bg: #f7faff;
    --bg-2: #ffffff;
    --bg-3: #e9f1ff;
    --text: #0b1b3a;
    --muted: #44536b;
    --dim: #56667f;
    --accent: #2563eb;
    --accent-ink: #1d4ed8;
    --ink-rgb: 29, 78, 216;
    --scrim-rgb: 247, 250, 255;
    --word-dim: #bccbe6;
    --strong: #061230;
    --btn-bg: #2563eb; --btn-ink: #ffffff; --btn-hover: #1d4ed8;
    --thumb: #bfd1f2;
    --card: rgba(255, 255, 255, 0.95);
    --shadow: rgba(37, 99, 235, 0.2);
    color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); -webkit-text-size-adjust: 100%; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 400 16px/1.6 var(--sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    caret-color: var(--accent-ink);
    overflow-x: clip;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-color: var(--line-2); text-underline-offset: 0.22em; }
a:hover { text-decoration-color: currentColor; }
p { margin: 0; }
h1, h2, h3 { margin: 0; font-weight: 600; text-wrap: balance; }
ul, ol { margin: 0; padding: 0; list-style: none; }
address { font-style: normal; }

::selection { background: rgba(59, 130, 246, 0.42); color: var(--strong); }
:focus-visible { outline: 2px solid var(--accent-ink); outline-offset: 3px; border-radius: 4px; }
html { scrollbar-color: var(--thumb) var(--bg); scrollbar-width: thin; }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--thumb); border-radius: 10px; border: 2px solid var(--bg); }

.visually-hidden {
    position: absolute !important; width: 1px; height: 1px; overflow: hidden;
    clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}
.skip {
    position: fixed; left: 12px; top: -60px; z-index: 100;
    background: var(--text); color: var(--bg); padding: 10px 14px; border-radius: 8px; font-weight: 600;
}
.skip:focus { top: 12px; }

/* The hairline frame: every section lives between the same two rails. */
.frame {
    width: min(1280px, 100%);
    margin-inline: auto;
    border-inline: 1px solid var(--line);
}
main.frame { position: relative; z-index: 1; }
main > section { border-top: 1px solid var(--line); padding-inline: var(--gutter); position: relative; }

.ico {
    width: 20px; height: 20px; flex: none;
    fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
}

/* ---------- particle canvas (behind content) ---------- */
.fx {
    position: fixed; inset: 0; width: 100vw; height: 100vh;
    z-index: 0; pointer-events: none;
    opacity: 0; transition: opacity 1.2s var(--ease);
}
.fx.is-ready { opacity: 1; }

/* ---------- buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: 40px; padding: 0 16px; border-radius: 8px;
    font: 500 14px/1 var(--sans); text-decoration: none; white-space: nowrap;
    border: 1px solid transparent; cursor: pointer;
    transition: background-color 200ms var(--ease), border-color 200ms var(--ease), color 200ms var(--ease), transform 200ms var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--light { background: var(--btn-bg); color: var(--btn-ink); }
.btn--light:hover { background: var(--btn-hover); }
.btn--dark { background: var(--bg-3); color: var(--text); border-color: var(--line-2); }
.btn--dark:hover { border-color: rgba(var(--ink-rgb), 0.3); }
.btn:disabled { opacity: 0.55; cursor: progress; }

/* ---------- header ---------- */
.hdr {
    position: fixed; inset: 0 0 auto 0; z-index: 20;
    background: rgba(var(--scrim-rgb), 0.8);
    backdrop-filter: blur(14px) saturate(1.2);
    -webkit-backdrop-filter: blur(14px) saturate(1.2);
    border-bottom: 1px solid var(--line);
}
.hdr__in {
    height: var(--hdr);
    display: flex; align-items: center; gap: 36px;
    padding-inline: var(--gutter);
}
.hdr__brand {
    display: inline-flex; align-items: center; gap: 10px;
    font: 700 15px/1 var(--display); letter-spacing: 0.04em; text-decoration: none;
}
.hdr__brand img { width: 28px; height: 28px; object-fit: contain; }
.hdr__nav { display: flex; gap: 28px; margin-right: auto; }
.hdr__nav a { font-size: 14px; color: var(--muted); text-decoration: none; transition: color 200ms; }
.hdr__nav a:hover { color: var(--text); }
.hdr__cta { height: 34px; font-size: 13px; }
.hdr__menu { display: none; }
.mnav { display: none; }

/* ---------- hero ---------- */
.hero {
    min-height: 100svh;
    padding-top: calc(var(--hdr) + clamp(48px, 12vh, 140px));
    display: grid; grid-template-rows: 1fr auto;
    border-top: 0 !important;
}
.hero__copy { max-width: 660px; align-self: center; padding-bottom: 64px; }
.hero__title {
    font: 700 clamp(40px, 5.4vw, 76px)/1.04 var(--display);
    letter-spacing: -0.035em;
    text-wrap: balance;
}
.nw { white-space: nowrap; }
.hero__lead { margin-top: 24px; color: var(--muted); font-size: 17px; max-width: 46ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }
.hero__actions--center { justify-content: center; }

.pillars {
    display: grid; grid-template-columns: repeat(5, 1fr);
    border-top: 1px solid var(--line);
    margin-inline: calc(var(--gutter) * -1);
}
.pillar { padding: 26px clamp(16px, 2vw, 28px) 32px; }
.pillar + .pillar { border-left: 1px solid var(--line); }
.pillar .ico { color: var(--accent-ink); margin-bottom: 16px; }
.pillar__title { font: 600 15px/1.3 var(--sans); }
.pillar p { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* ---------- partners marquee ---------- */
.partners { padding-block: 28px 32px; }
.partners__title { font: 600 clamp(17px, 1.7vw, 22px)/1.35 var(--sans); letter-spacing: -0.01em; color: var(--text); margin-bottom: 24px; }
.partners__title strong { font-weight: 600; color: var(--accent-ink); }
.marquee {
    overflow: hidden;
    -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
            mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.marquee__track {
    display: flex; align-items: center; gap: 16px; width: max-content; padding-right: 16px;
    animation: marquee 38s linear infinite;
}
.marquee__track li {
    display: grid; place-items: center; height: 72px; padding: 0 22px;
    background: #fbfaf8; border-radius: 10px;
    box-shadow: 0 10px 30px -18px var(--shadow); border: 1px solid var(--line);
}
.marquee__track img { height: auto; max-height: 46px; max-width: 150px; width: auto; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- statements (scroll-scrubbed words) ---------- */
.statement { padding-block: clamp(56px, 8vh, 96px); }
.statement__text {
    font: 600 clamp(26px, 3.3vw, 44px)/1.18 var(--sans);
    letter-spacing: -0.022em;
    max-width: 24ch;
    color: var(--text);
}
.statement__text strong { font-weight: 600; }
.statement__text--sm { font-size: clamp(24px, 2.6vw, 34px); max-width: 30ch; }
.statement__text .w { color: var(--word-dim); transition: color 0.15s linear; }
.statement__text .w.is-on { color: var(--muted); }
.statement__text strong .w.is-on { color: var(--text); }

/* ---------- products ---------- */
.products { padding: 0; }
.products__panels { display: grid; }
.pp {
    display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 4fr); gap: clamp(32px, 6vw, 96px);
    align-items: center;
    padding: 96px var(--gutter);
}
.pp + .pp { border-top: 1px solid var(--line); }
.pp__title { font: 600 clamp(26px, 2.6vw, 34px)/1.15 var(--sans); letter-spacing: -0.015em; max-width: 18ch; }
.pp__text { color: var(--muted); margin-top: 16px; max-width: 48ch; }
.facts { margin-top: 28px; display: grid; gap: 12px; }
.facts li { display: flex; gap: 12px; align-items: center; font-size: 14px; }
.facts .ico { color: var(--accent-ink); width: 18px; height: 18px; }
.more {
    display: inline-flex; align-items: center; gap: 10px; margin-top: 32px;
    font-size: 14px; color: var(--text); text-decoration: none;
}
.more svg {
    width: 22px; height: 22px; padding: 4px; border: 1px solid var(--line-2); border-radius: 50%;
    fill: none; stroke: currentColor; stroke-width: 2; transition: transform 250ms var(--ease), border-color 250ms;
}
.more:hover svg { transform: translateX(3px); border-color: var(--text); }

.spec {
    background: var(--card);
    border: 1px solid var(--line-2);
    border-radius: 12px;
    box-shadow: 0 30px 60px -30px var(--shadow);
    font-family: var(--mono);
    font-size: 13px;
    overflow: hidden;
}
.spec__head, .spec__foot {
    display: flex; justify-content: space-between; align-items: center; gap: 12px;
    padding: 12px 16px; color: var(--muted);
}
.spec__head { border-bottom: 1px solid var(--line); }
.spec__foot { border-top: 1px solid var(--line); font-size: 12px; }
.spec__foot a { color: var(--accent-ink); text-decoration: none; }
.spec__foot a:hover { text-decoration: underline; }
.spec__meta { color: var(--dim); }
.spec__rows li {
    display: grid; grid-template-columns: 96px 1fr auto; gap: 12px; align-items: center;
    padding: 10px 16px; border-bottom: 1px solid var(--line);
}
.spec__rows li:last-child { border-bottom: 0; }
.spec__rows b { font-weight: 500; color: var(--text); }
.spec__rows span { color: var(--muted); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18); }

.products__head { padding: 72px var(--gutter) 0; }
.tabs { display: none; }

/* tabbed mode (desktop, JS): one stage, four panels, the particles change with the tab */
.products.is-tabbed .products__stage { min-height: 100vh; display: grid; grid-template-rows: auto 1fr; }
.products.is-tabbed .products__head { padding: calc(var(--hdr) + 16px) var(--gutter) 0; }
.products.is-tabbed .tabs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 24px; }
.tab {
    position: relative; overflow: hidden; text-align: left;
    display: flex; flex-direction: column; align-items: flex-start; gap: 10px;
    padding: 16px 18px 20px; background: rgba(var(--ink-rgb), 0.02);
    border: 1px solid var(--line-2); border-radius: 12px;
    font: 600 17px/1.25 var(--sans); letter-spacing: -0.01em; color: var(--muted); cursor: pointer;
    transition: color 200ms, background-color 200ms, border-color 200ms, transform 200ms var(--ease);
}
.tab:hover { color: var(--text); border-color: rgba(var(--ink-rgb), 0.3); transform: translateY(-2px); }
.tab[aria-selected="true"] { color: var(--text); background: rgba(59, 130, 246, 0.08); border-color: var(--accent); }
.tab__no { font: 500 12px/1 var(--mono); color: var(--dim); }
.tab[aria-selected="true"] .tab__no { color: var(--accent-ink); }
.tab__bar {
    position: absolute; left: 0; right: 0; bottom: 0; height: 3px; border-radius: 2px;
    background: var(--accent); transform: scaleX(0); transform-origin: 0 50%;
}
.products.is-tabbed .products__panels { grid-template-areas: "p"; align-items: center; }
.products.is-tabbed .pp { grid-area: p; padding-block: 24px 32px; border-top: 0; }
.products.is-tabbed .pp:not(.is-active) { pointer-events: none; }
.products.is-tabbed .pp:not(.is-active) .pp__copy,
.products.is-tabbed .pp:not(.is-active) .pp__side { visibility: hidden; }

/* ---------- shared section type ---------- */
.h2 { font: 600 clamp(26px, 2.6vw, 34px)/1.15 var(--sans); letter-spacing: -0.015em; }
.lead { color: var(--muted); margin-top: 14px; max-width: 52ch; }
.lead a { color: var(--text); }

/* ---------- research ---------- */
.research {
    display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 6fr); gap: clamp(32px, 6vw, 96px);
    padding-block: 64px; align-items: start;
}
.notes { margin-top: 32px; border-top: 1px solid var(--line); }
.notes li { padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.notes li span { display: block; font: 12px/1.4 var(--mono); color: var(--dim); margin-top: 4px; }
.pubs {
    border: 1px solid var(--line-2); border-radius: 12px; background: var(--bg-2); overflow: hidden;
}
.pubs__head {
    display: flex; justify-content: space-between; padding: 12px 18px;
    font: 12px/1 var(--mono); color: var(--dim); border-bottom: 1px solid var(--line);
}
.pub {
    display: grid; grid-template-columns: 44px 1fr auto; gap: 16px; align-items: center;
    padding: 16px 18px; border-bottom: 1px solid var(--line);
    transition: background-color 200ms;
}
.pub:last-child { border-bottom: 0; }
.pub:hover { background: rgba(var(--ink-rgb), 0.025); }
.pub img { width: 44px; height: 58px; object-fit: cover; border-radius: 3px; }
.pub h3 { font: 500 14px/1.4 var(--sans); }
.pub p { font: 12px/1.4 var(--mono); color: var(--dim); margin-top: 4px; }
.pub em { font-style: normal; color: var(--muted); }
.pub__year { font: 500 12px/1 var(--mono); color: var(--accent-ink); }

/* ---------- services: three linked cards, a ⇄ chip on each seam ---------- */
.services { padding-block: 64px; }
.services__head { max-width: 640px; margin-bottom: 32px; }
.svc { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); counter-reset: svc; }
.svc__item { position: relative; display: flex; flex-direction: column; background: var(--bg); padding: 28px 28px 24px; transition: background-color 300ms; }
.svc__item:hover { background: var(--bg-2); }
.svc__item + .svc__item::before {
    content: "⇄"; position: absolute; left: -15px; top: 34px; z-index: 1; width: 28px; height: 28px; border-radius: 50%;
    display: grid; place-items: center; font: 600 14px/1 var(--sans); color: var(--accent-ink);
    background: var(--bg); border: 1px solid var(--line-2);
}
.svc__no { font: 500 12px/1 var(--mono); color: var(--accent-ink); }
.svc .ico { width: 30px; height: 30px; margin-top: 22px; fill: none; stroke: var(--accent-ink); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.svc h3 { font: 700 clamp(18px, 1.6vw, 21px)/1.3 var(--display); color: var(--text); margin-top: 16px; max-width: 18ch; }
.svc .checks { margin-top: 18px; color: var(--muted); }
.svc__link { margin-top: auto; padding-top: 24px; font: 600 14px/1 var(--sans); color: var(--accent-ink); text-decoration: none; }
.svc__link span { display: inline-block; transition: transform 300ms var(--ease); }
.svc__link:hover span { transform: translateX(4px); }
@media (max-width: 900px) {
    .svc { grid-template-columns: 1fr; }
    .svc__item + .svc__item::before { content: "⇅"; left: 28px; top: -15px; }
}

/* ---------- team ---------- */
.team { padding-block: 64px; }
.team__head { max-width: 640px; margin-bottom: 32px; }
.experts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.expert { background: var(--bg); padding: 16px 16px 22px; }
.expert picture { display: block; overflow: hidden; border-radius: 6px; aspect-ratio: 4 / 5; background: var(--bg-3); }
.expert picture img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 900ms var(--ease);
}
.expert:hover picture img { transform: scale(1.03); }
.expert h3 { font: 600 15px/1.3 var(--sans); margin-top: 18px; }
.expert p { font-size: 14px; color: var(--muted); margin-top: 2px; }
.expert .expert__org { font: 12px/1.4 var(--mono); color: var(--dim); margin-top: 8px; }
.expert a {
    display: inline-flex; align-items: center; gap: 6px; margin-top: 14px;
    font-size: 13px; color: var(--accent-ink); text-decoration: none;
}
.expert a svg, .ftr a svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.expert a:hover { text-decoration: underline; }

/* ---------- about + numbers ---------- */
.about { padding-block: 64px 56px; }
.stats-band {
    position: relative; isolation: isolate; overflow: hidden;
    margin: 48px calc(var(--gutter) * -1) 0;
    border-block: 1px solid var(--line);
}
.stats { display: grid; grid-template-columns: repeat(4, 1fr); }
.stats li { padding: 40px var(--gutter) 44px; }
.stats li + li { border-left: 1px solid var(--line); }
.stats .ico { display: block; color: var(--dim); margin-bottom: 28px; }
.stats b {
    font: 700 clamp(40px, 4.4vw, 60px)/1 var(--display); letter-spacing: -0.035em;
    font-variant-numeric: tabular-nums;
}
.stats span { font: 700 clamp(28px, 3vw, 40px)/1 var(--display); color: var(--accent-ink); margin-left: 2px; }
.stats p { color: var(--muted); font-size: 14px; margin-top: 10px; }
.about__body {
    display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 6fr); gap: clamp(32px, 6vw, 96px);
    margin-top: 48px;
}
.about__since { font: 13px/1.4 var(--mono); color: var(--text); margin-top: 14px; }
.about__since span { color: var(--dim); }
.about__text p { color: var(--muted); max-width: 65ch; }
.about__text p + p { margin-top: 16px; }
.checks { margin-top: 28px; display: grid; gap: 10px; }
.checks li { position: relative; padding-left: 26px; font-size: 14px; }
.checks li::before {
    content: ""; position: absolute; left: 2px; top: 0.45em; width: 11px; height: 6px;
    border-left: 1.6px solid var(--accent-ink); border-bottom: 1.6px solid var(--accent-ink);
    transform: rotate(-45deg);
}

/* ---------- FAQ ---------- */
.faq {
    display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 6fr); gap: clamp(32px, 6vw, 96px);
    padding-block: 64px;
}
.faq__list { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
    list-style: none; cursor: pointer; position: relative;
    padding: 22px 44px 22px 0; font: 500 16px/1.4 var(--sans);
    transition: color 200ms;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before, .faq summary::after {
    content: ""; position: absolute; right: 8px; top: 50%; width: 14px; height: 1.5px;
    background: var(--muted); transition: transform 300ms var(--ease);
}
.faq summary::after { transform: rotate(90deg); }
.faq details[open] summary::after { transform: rotate(0deg); }
.faq summary:hover { color: var(--strong); }
.faq details p { color: var(--muted); padding: 0 44px 24px 0; max-width: 65ch; }
.faq details p a { color: var(--text); }

/* ---------- contact ---------- */
.contact { padding-block: 0 64px; }
.contact__hero {
    min-height: 64vh; display: grid; place-content: center; text-align: center;
    padding-block: 64px; justify-items: center;
}
.contact__title {
    font: 700 clamp(40px, 5.6vw, 76px)/1.04 var(--display); letter-spacing: -0.035em;
    max-width: 14ch;
}
.contact__hero .lead { margin-inline: auto; margin-top: 20px; }
.contact__grid {
    display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 4fr); gap: clamp(32px, 5vw, 72px);
    border: 1px solid var(--line-2); border-radius: 14px; background: var(--card);
    padding: clamp(24px, 3vw, 40px);
}
.form { display: grid; gap: 16px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form label { display: grid; gap: 8px; font: 12px/1 var(--mono); color: var(--muted); }
.form input, .form select, .form textarea {
    font: 400 15px/1.4 var(--sans); color: var(--text);
    background: var(--bg); border: 1px solid var(--line-2); border-radius: 8px;
    padding: 11px 12px; width: 100%;
    transition: border-color 200ms, box-shadow 200ms;
}
.form textarea { resize: vertical; min-height: 110px; }
.form input::placeholder, .form textarea::placeholder { color: var(--dim); }
.form input:focus, .form select:focus, .form textarea:focus {
    outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.22);
}
.form input[aria-invalid="true"] { border-color: #e5484d; }
.form__foot { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.form__status { font-size: 14px; color: var(--muted); }
.form__status.is-ok { color: #6ee7a8; }
.form__status.is-error { color: #ff8a8e; }
.info { display: grid; gap: 22px; align-content: start; }
.info span { font: 12px/1 var(--mono); color: var(--dim); }
.info p { margin-top: 8px; font-size: 15px; }
.info a { text-decoration: none; }
.info a:hover { color: var(--accent-ink); }

/* ---------- footer ---------- */
.ftr { position: relative; z-index: 1; border-top: 1px solid var(--line); background: var(--bg); overflow: hidden; }
.ftr__in { padding: 56px var(--gutter) 0; }
.ftr__cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.ftr h2 { font: 600 14px/1 var(--sans); margin-bottom: 18px; }
.ftr__cols a {
    display: flex; align-items: center; gap: 6px; width: fit-content;
    font-size: 14px; color: var(--muted); text-decoration: none; padding: 5px 0;
}
.ftr__cols a:hover { color: var(--text); }
.ftr__bottom {
    display: flex; justify-content: space-between; gap: 16px; margin-top: 64px;
    padding-top: 22px; border-top: 1px solid var(--line); font-size: 13px; color: var(--dim);
}
.ftr__bottom a { text-decoration: none; }
.ftr__bottom a:hover { color: var(--text); }
.ftr__word {
    font: 800 clamp(80px, 19vw, 270px)/0.78 var(--display); letter-spacing: -0.05em;
    color: rgba(var(--ink-rgb), 0.05);
    margin: 40px 0 -0.04em; white-space: nowrap; user-select: none; text-align: center;
}

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
    .experts { grid-template-columns: repeat(2, 1fr); }
    .hdr__nav { gap: 20px; }
}
@media (max-width: 900px) {
    :root { --hdr: 58px; }
    .hdr__nav, .hdr__cta { display: none; }
    .hdr__in { justify-content: space-between; }
    .hdr__menu {
        display: grid; gap: 6px; width: 40px; height: 40px; place-content: center;
        background: transparent; border: 1px solid var(--line-2); border-radius: 8px; cursor: pointer;
    }
    .hdr__menu span { width: 16px; height: 1.5px; background: var(--text); transition: transform 250ms var(--ease); }
    .hdr__menu[aria-expanded="true"] span:first-child { transform: translateY(3.75px) rotate(45deg); }
    .hdr__menu[aria-expanded="true"] span:last-child { transform: translateY(-3.75px) rotate(-45deg); }
    .mnav:not([hidden]) {
        display: grid; padding: 8px var(--gutter) 20px; border-top: 1px solid var(--line);
    }
    .mnav a { padding: 12px 0; font-size: 17px; text-decoration: none; border-bottom: 1px solid var(--line); }

    .pp, .research, .about__body, .faq, .contact__grid { grid-template-columns: 1fr; }
    .pp { padding-block: 56px; }
    .stats { grid-template-columns: 1fr 1fr; }
    .stats li:nth-child(3) { border-left: 0; }
    .stats li:nth-child(n+3) { border-top: 1px solid var(--line); }
    .ftr__cols { grid-template-columns: 1fr 1fr; }
    .research, .team, .faq { padding-block: 48px; }
    .about { padding-block: 48px; }
    .contact__hero { min-height: 56vh; padding-block: 64px; }
}
@media (max-width: 560px) {
    .form__row { grid-template-columns: 1fr; }
    .experts { grid-template-columns: 1fr 1fr; }
    .expert { padding: 10px 10px 18px; }
    .spec__rows li { grid-template-columns: 84px 1fr auto; }
    .pub { grid-template-columns: 36px 1fr; }
    .pub img { width: 36px; height: 48px; }
    .pub__year { grid-column: 2; }
    .ftr__bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
    .marquee__track { animation: none; flex-wrap: wrap; justify-content: center; width: auto; }
    .marquee { -webkit-mask-image: none; mask-image: none; }
    .fx { transition: none; }
    .expert img, .btn, .more svg { transition: none; }
}

main > section, .ftr { scroll-margin-top: var(--hdr); }

/* ---------- background photos ----------
   Dimmed and feathered into the black so the particle field still reads
   through them (the canvas sits behind the page). */
.hero, .contact__hero { position: relative; isolation: isolate; }
.sbg { position: absolute; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.sbg img { width: 100%; height: 100%; object-fit: cover; }
.sbg--hero, .sbg--contact { inset: 0 auto 0 50%; width: 100vw; transform: translateX(-50%); }
.sbg--hero {
    -webkit-mask-image: linear-gradient(180deg, #000 55%, transparent 100%);
            mask-image: linear-gradient(180deg, #000 55%, transparent 100%);
}
.sbg--hero::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(var(--scrim-rgb), 0.84) 0%, rgba(var(--scrim-rgb), 0.42) 45%, rgba(var(--scrim-rgb), 0.08) 100%);
}
.sbg--band img { opacity: 0.3; }
.sbg--band::after {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(var(--scrim-rgb), 0.35), rgba(var(--scrim-rgb), 0.75));
}
.sbg--contact img {
    opacity: 0.16;
    -webkit-mask-image: radial-gradient(ellipse 70% 65% at 50% 50%, #000 30%, transparent 100%);
            mask-image: radial-gradient(ellipse 70% 65% at 50% 50%, #000 30%, transparent 100%);
}

/* ---------- product photo at the head of each panel's copy ---------- */
.pp__img {
    width: 100%; max-width: 520px; aspect-ratio: 4 / 3; object-fit: cover;
    border-radius: 12px; border: 1px solid var(--line-2); margin-bottom: 28px;
}

/* ---------- featured products ---------- */
.gallery { padding-block: 64px; }
.gallery__head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 28px; }
.gallery__head .more { margin-top: 0; }
.gallery__nav { display: flex; align-items: center; gap: 10px; }
.gallery__nav .more { margin-right: 14px; }
.gbtn {
    width: 40px; height: 40px; display: grid; place-items: center; cursor: pointer;
    background: var(--bg-3); color: var(--text); border: 1px solid var(--line-2); border-radius: 50%;
    transition: border-color 200ms, opacity 200ms;
}
.gbtn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.gbtn:hover { border-color: rgba(var(--ink-rgb), 0.35); }
.gbtn:disabled { opacity: 0.35; cursor: default; }
/* autoplaying slider: a transform track, looped with clones */
.slider { overflow: hidden; touch-action: pan-y; border-radius: 12px; }
.slider__track { display: flex; gap: 16px; will-change: transform; cursor: grab; user-select: none; }
.slider__track.is-animating { transition: transform 750ms var(--ease); }
.slider__track.is-dragging { cursor: grabbing; }
.slider__track li { flex: 0 0 calc((100% - 48px) / 4); }
.slider__track img { -webkit-user-drag: none; pointer-events: none; }
.gallery figure { margin: 0; position: relative; overflow: hidden; border-radius: 12px; background: #fff; }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transition: transform 900ms var(--ease); }
.gallery figure:hover img { transform: scale(1.04); }
.gallery figcaption {
    position: absolute; left: 12px; bottom: 12px;
    font: 500 13px/1 var(--sans); color: var(--text);
    background: rgba(var(--scrim-rgb), 0.85); border: 1px solid var(--line-2);
    padding: 9px 12px; border-radius: 8px;
}

/* ---------- about photo ---------- */
.about__img { margin-top: 32px; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 12px; border: 1px solid var(--line); }

@media (max-width: 900px) {
    .gallery { padding-block: 48px; }
    .slider__track { gap: 10px; }
    .slider__track li { flex-basis: calc((100% - 10px) / 2); }
    .pp__img { margin-bottom: 22px; }
    .gallery figcaption { left: 8px; bottom: 8px; font-size: 12px; padding: 7px 9px; }
    .sbg--hero::after { background: linear-gradient(180deg, rgba(var(--scrim-rgb), 0.35) 0%, rgba(var(--scrim-rgb), 0.85) 60%); }
    .marquee__track li { height: 60px; padding: 0 16px; }
    .marquee__track img { max-height: 38px; max-width: 120px; }
}
@media (max-width: 560px) {
    .gallery__head { flex-direction: column; align-items: start; }
}

/* ---------- theme toggle ---------- */
.theme-toggle {
    width: 34px; height: 34px; display: grid; place-items: center; flex: none; cursor: pointer;
    background: transparent; color: var(--muted); border: 1px solid var(--line-2); border-radius: 50%;
    transition: color 200ms, border-color 200ms;
}
.theme-toggle:hover { color: var(--text); border-color: rgba(var(--ink-rgb), 0.3); }
.theme-toggle svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; }
.theme-toggle .i-sun { display: none; }
:root[data-theme="light"] .theme-toggle .i-sun { display: block; }
:root[data-theme="light"] .theme-toggle .i-moon { display: none; }
/* light mode: logo tiles and photos sit on white already; keep them crisp */
:root[data-theme="light"] .marquee__track li { background: #fff; }
:root[data-theme="light"] .sbg--contact img { opacity: 0.12; }
/* keep the contact copy readable over its photo */
.sbg--contact::after {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(ellipse 45% 40% at 50% 50%, rgba(var(--scrim-rgb), 0.7), transparent 100%);
}
:root[data-theme="light"] .sbg--band img { opacity: 0.38; }


/* light mode: secondary buttons read as pale blue chips */
:root[data-theme="light"] .btn--dark { background: #ffffff; color: var(--accent-ink); border-color: rgba(37, 99, 235, 0.35); }
:root[data-theme="light"] .btn--dark:hover { background: var(--bg-3); border-color: var(--accent); }
:root[data-theme="light"] .hdr { background: rgba(247, 250, 255, 0.85); }
:root[data-theme="light"] .experts { background: var(--bg-2); }

/* ---------- header search ---------- */
.search {
    position: relative; display: flex; align-items: center; gap: 8px;
    width: 280px; height: 36px; padding: 0 10px 0 12px;
    background: rgba(var(--ink-rgb), 0.05); border: 1px solid var(--line-2); border-radius: 9px;
    transition: border-color 200ms, background-color 200ms;
}
.search:focus-within { border-color: var(--accent); background: var(--bg-2); }
.search .ico { width: 16px; height: 16px; color: var(--dim); }
.search input {
    flex: 1; min-width: 0; height: 100%; border: 0; outline: 0; background: transparent;
    font: 400 14px/1 var(--sans); color: var(--text);
}
.search input::placeholder { color: var(--dim); }
.search input::-webkit-search-cancel-button { display: none; }
.search kbd {
    font: 500 11px/1 var(--mono); color: var(--dim);
    border: 1px solid var(--line-2); border-radius: 5px; padding: 3px 6px;
}
.search:focus-within kbd { display: none; }
.search__results {
    position: absolute; top: calc(100% + 8px); right: 0; width: min(440px, 92vw);
    max-height: min(70vh, 520px); overflow-y: auto; overscroll-behavior: contain;
    background: var(--bg-2); border: 1px solid var(--line-2); border-radius: 12px;
    box-shadow: 0 24px 60px -20px var(--shadow); padding: 6px;
}
.sr__group { font: 500 11px/1 var(--mono); color: var(--dim); padding: 12px 10px 6px; }
.sr__item {
    display: grid; grid-template-columns: 40px 1fr; gap: 12px; align-items: center;
    padding: 8px 10px; border-radius: 8px; text-decoration: none; color: var(--text);
}
.sr__item[aria-selected="true"], .sr__item:hover { background: rgba(var(--ink-rgb), 0.06); }
.sr__thumb { width: 40px; height: 40px; border-radius: 6px; object-fit: cover; background: #fff; }
.sr__doc { width: 40px; height: 40px; border-radius: 6px; display: grid; place-items: center; background: rgba(var(--ink-rgb), 0.06); color: var(--accent-ink); }
.sr__doc svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.sr__name { display: block; font-size: 14px; font-weight: 500; line-height: 1.3; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sr__meta { display: block; font: 12px/1.4 var(--mono); color: var(--dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sr__item mark { background: rgba(59, 130, 246, 0.28); color: inherit; border-radius: 3px; }
.sr__empty { padding: 18px 12px; font-size: 14px; color: var(--muted); }
.sr__empty a { color: var(--accent-ink); }
.hdr__icon {
    display: none; width: 34px; height: 34px; place-items: center; flex: none; cursor: pointer;
    background: transparent; color: var(--muted); border: 1px solid var(--line-2); border-radius: 50%;
}
.hdr__icon .ico { width: 16px; height: 16px; }
@media (max-width: 1180px) { .search { width: 220px; } }
@media (max-width: 900px) {
    .hdr__search-btn { display: grid; margin-left: auto; }
    .theme-toggle { margin-left: 0; }
    .hdr__in { gap: 10px; }
    .search {
        display: none; position: absolute; left: var(--gutter); right: var(--gutter); top: calc(var(--hdr) + 8px);
        width: auto; height: 44px;
    }
    .hdr.is-searching .search { display: flex; background: var(--bg-2); }
    .search kbd { display: none; }
    .search__results { left: 0; right: 0; width: auto; }
}

/* the chip forms above the contact headline: give it the room */
.contact__hero { padding-top: clamp(200px, 34vh, 340px); }
@media (max-width: 900px) { .contact__hero { padding-top: clamp(180px, 36vh, 300px); } }

.pp__side { display: grid; gap: 14px; }
.more--card { margin-top: 0; justify-self: end; font-weight: 500; }
.more--card:hover { color: var(--accent-ink); }

/* expert cards: the institution's logo in the free bottom-right corner */
.expert { position: relative; }
.expert__logo {
    position: absolute; right: 16px; bottom: 20px;
    height: 36px; width: auto; max-width: 76px; object-fit: contain;
    background: #fff; border-radius: 8px; padding: 4px 6px; border: 1px solid var(--line);
}
.expert a { margin-right: 84px; }
@media (max-width: 1080px) { .products.is-tabbed .tabs { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) {
    .expert__logo { right: 10px; bottom: 16px; height: 28px; max-width: 58px; padding: 3px 5px; }
    .expert a { margin-right: 64px; font-size: 12.5px; }
}

/* ---------- research: products in use (expandable case list) ---------- */
.apps { grid-column: 1 / -1; border: 1px solid var(--line-2); border-radius: 14px; background: var(--card); overflow: hidden; }
.apps__toggle {
    list-style: none; cursor: pointer;
    display: grid; grid-template-columns: 1fr auto auto; grid-template-areas: "label meta chev" "title meta chev";
    column-gap: 20px; row-gap: 6px; align-items: center;
    padding: 20px 22px;
    transition: background-color 200ms;
}
.apps__toggle::-webkit-details-marker { display: none; }
.apps__toggle:hover { background: rgba(var(--ink-rgb), 0.03); }
.apps__label { grid-area: label; font: 500 12px/1 var(--mono); color: var(--accent-ink); }
.apps__title { grid-area: title; font: 600 clamp(17px, 1.6vw, 20px)/1.3 var(--sans); letter-spacing: -0.01em; }
.apps__meta { grid-area: meta; font: 12px/1 var(--mono); color: var(--dim); }
.apps__chev {
    grid-area: chev; width: 40px; height: 40px; display: grid; place-items: center;
    border: 1px solid var(--line-2); border-radius: 50%; color: var(--text);
    transition: border-color 200ms, background-color 200ms;
}
.apps__toggle:hover .apps__chev { border-color: var(--accent); background: rgba(59, 130, 246, 0.1); }
.apps__chev svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.8; transition: transform 300ms var(--ease); }
.apps[open] .apps__chev svg { transform: rotate(180deg); }
.apps[open] .apps__toggle { border-bottom: 1px solid var(--line); }

.case {
    display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: clamp(20px, 3vw, 44px);
    padding: 28px 22px 30px;
}
.case + .case { border-top: 1px solid var(--line); }
.case__no { font: 500 12px/1 var(--mono); color: var(--dim); }
.case__title { font: 600 17px/1.35 var(--sans); letter-spacing: -0.01em; margin-top: 12px; }
.case__org { font: 12px/1.5 var(--mono); color: var(--dim); margin-top: 8px; }
.case__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.case__tags li { font: 12px/1 var(--mono); color: var(--muted); border: 1px solid var(--line-2); border-radius: 999px; padding: 6px 10px; }
.case__sub { font: 500 14px/1.4 var(--sans); color: var(--muted); margin-bottom: 12px; }
.case__sub + .case__strip { margin-bottom: 28px; }
.case__flows .case__strip:last-child { margin-bottom: 0; }

/* images are shown at (or below) their real pixel size: never upscaled */
.case__strip { display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-start; }
.case__fig { margin: 0; width: min-content; display: grid; gap: 10px; }
.case__zoom {
    display: block; padding: 0; border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
    background: #fff; cursor: zoom-in; transition: border-color 200ms, transform 300ms var(--ease);
}
.case__zoom:hover { border-color: var(--accent); transform: translateY(-2px); }
.case__zoom img {
    display: block; height: min(180px, calc(var(--h) * 1px)); width: auto;
    max-width: min(calc(var(--w) * 1px), 100%); object-fit: contain;
}
.case__strip--flow .case__zoom img { height: min(150px, calc(var(--h) * 1px)); }
.case__fig figcaption { font-size: 13px; line-height: 1.5; color: var(--muted); min-width: 150px; }
.case__step { display: block; font: 500 11px/1 var(--mono); color: var(--accent-ink); margin-bottom: 6px; }
.case__arrow { flex: none; align-self: center; margin-top: -40px; width: 20px; height: 20px; fill: none; stroke: var(--dim); stroke-width: 1.6; }

/* lightbox: the photo at its own size */
.lb {
    border: 1px solid var(--line-2); border-radius: 14px; padding: 16px; background: var(--bg-2); color: var(--text);
    max-width: 92vw; max-height: 90vh; box-shadow: 0 40px 90px -30px var(--shadow);
}
.lb::backdrop { background: rgba(var(--scrim-rgb), 0.78); backdrop-filter: blur(6px); }
.lb__img { display: block; margin: 0 auto; max-width: min(100%, 86vw); max-height: 74vh; width: auto; height: auto; background: #fff; border-radius: 8px; }
.lb__cap { font-size: 14px; color: var(--muted); margin-top: 12px; max-width: 60ch; }
.lb__close {
    position: absolute; top: 10px; right: 10px; width: 34px; height: 34px; display: grid; place-items: center;
    background: var(--bg-2); color: var(--text); border: 1px solid var(--line-2); border-radius: 50%; cursor: pointer;
}
.lb__close svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.notes a { color: var(--text); text-decoration: underline; text-decoration-color: var(--line-2); }
.notes a:hover { text-decoration-color: currentColor; }

@media (max-width: 900px) {
    .apps__toggle { grid-template-areas: "label chev" "title chev" "meta chev"; grid-template-columns: 1fr auto; padding: 18px; }
    .case { grid-template-columns: 1fr; padding: 22px 18px; }
    .case__strip--flow { flex-direction: column; flex-wrap: nowrap; }
    .case__arrow { margin: 0 0 0 20px; transform: rotate(90deg); align-self: flex-start; }
    .case__fig { width: auto; }
    .case__fig figcaption { min-width: 0; }
}

.apps__less { display: none; }
.apps[open] .apps__more { display: none; }
.apps[open] .apps__less { display: inline; }
.apps__toggle:hover .apps__meta { color: var(--accent-ink); }

/* ---------- hero: rotating background photos ---------- */
.sbg--hero img {
    position: absolute; inset: 0; width: 100%; height: 100%;
    opacity: 0; transform: scale(1.06);
    transition: opacity 1.6s var(--ease), transform 8s linear;
}
.sbg--hero img.is-on { opacity: 0.42; transform: scale(1); }
:root[data-theme="light"] .sbg--hero img.is-on { opacity: 0.26; }

/* ---------- hero: quick-contact rail (right) ---------- */
.hero { position: relative; }
.qc {
    position: absolute; right: var(--gutter); top: 50%; transform: translateY(-50%); z-index: 2;
    display: grid; gap: 12px;
}
.qc a {
    width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%;
    color: var(--text); background: rgba(var(--scrim-rgb), 0.55);
    border: 1px solid var(--line-2); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
    transition: background-color 200ms, border-color 200ms, color 200ms, transform 200ms var(--ease);
}
.qc a:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-2px); }
.qc svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linejoin: round; }
.qc svg .fill { fill: currentColor; stroke: none; }
.qc .qc__zalo img { width: 26px; height: 26px; border-radius: 7px; }

/* ---------- floating contact (bottom-left) ---------- */
.fab { position: fixed; left: 20px; bottom: 20px; z-index: 30; }
.fab__dock {
    display: grid; gap: 8px; padding: 6px;
    background: rgba(var(--scrim-rgb), 0.72); border: 1px solid var(--line-2); border-radius: 999px;
    backdrop-filter: blur(14px) saturate(1.2); -webkit-backdrop-filter: blur(14px) saturate(1.2);
    box-shadow: 0 16px 40px -18px var(--shadow);
}
.fab__btn {
    position: relative; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%; cursor: pointer;
    transition: background-color 200ms, border-color 200ms, transform 200ms var(--ease);
}
.fab__btn:hover { transform: scale(1.06); }
.fab__zalo { background: rgba(var(--ink-rgb), 0.05); border: 1px solid var(--line-2); }
.fab__zalo:hover { border-color: #0068ff; background: rgba(0, 104, 255, 0.12); }
.fab__zalo img { width: 30px; height: 30px; border-radius: 8px; display: block; }
.fab__chat { background: var(--accent); color: #fff; border: 0; }
.fab__chat:hover { background: #1d4ed8; }
.fab__chat svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linejoin: round; stroke-linecap: round; }
.fab__chat .i-close, .fab__chat[aria-expanded="true"] .i-chat { display: none; }
.fab__chat[aria-expanded="true"] .i-close { display: block; }
/* label on hover / keyboard focus */
.fab__btn::after {
    content: attr(data-tip); position: absolute; left: calc(100% + 14px); top: 50%;
    transform: translate(-6px, -50%); opacity: 0; pointer-events: none; white-space: nowrap;
    font: 500 13px/1 var(--sans); color: var(--text); padding: 8px 11px; border-radius: 8px;
    background: var(--bg-2); border: 1px solid var(--line-2); box-shadow: 0 10px 24px -12px var(--shadow);
    transition: opacity 180ms, transform 180ms var(--ease);
}
.fab__btn:hover::after, .fab__btn:focus-visible::after { opacity: 1; transform: translate(0, -50%); }
.fab__chat[aria-expanded="true"]::after { display: none; }
.fab .chat {
    position: absolute; left: 0; bottom: calc(100% + 12px); width: min(340px, calc(100vw - 40px));
    background: var(--bg-2); border: 1px solid var(--line-2); border-radius: 14px; padding: 18px;
    box-shadow: 0 30px 70px -24px var(--shadow);
}
.chat__title { font: 600 16px/1.3 var(--sans); }
.chat__lead { font-size: 13px; color: var(--muted); margin: 4px 0 14px; }
.fab .form { gap: 12px; }
.fab .form textarea { min-height: 80px; }
.fab { transition: opacity 300ms, visibility 300ms, transform 300ms var(--ease); }
@media (max-width: 900px) {
    .fab { left: 14px; bottom: 16px; }
    .fab__btn { width: 42px; height: 42px; }
    .fab__btn::after { display: none; }
    /* as on the live site: out of the way while the hero is on screen */
    .fab.is-hidden { opacity: 0; visibility: hidden; transform: translateY(14px); pointer-events: none; }
}
@media (prefers-reduced-motion: reduce) { .sbg--hero img { transition: opacity 0.4s; transform: none !important; } }

/* ---------- product titles link to their group page ---------- */
.pp__link { color: inherit; text-decoration: none; }
.pp__link:hover { color: var(--accent-ink); }

/* ================= phones ================= */
@media (max-width: 900px) {
    /* hero: compact, copy first, wafer tucked top-right behind it */
    .hero { min-height: 0; padding-top: calc(var(--hdr) + 150px); grid-template-rows: auto auto; }
    .hero__copy { padding-bottom: 28px; }
    .hero__title { font-size: clamp(34px, 10vw, 44px); }
    .hero__lead { font-size: 15px; margin-top: 16px; }
    .hero__actions { margin-top: 22px; }
    .hero__actions .btn { flex: 1 1 0; }
    .qc {
        position: static; transform: none; display: flex; gap: 10px;
        margin: 0 0 28px;
    }
    .qc a { width: 44px; height: 44px; }
    .pillars { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; scrollbar-width: none; }
    .pillars::-webkit-scrollbar { display: none; }
    .pillar { flex: 0 0 36%; scroll-snap-align: start; padding: 18px 12px 20px; }
    .pillar + .pillar { border-top: 0; border-left: 1px solid var(--line); }
    .pillar .ico { margin-bottom: 10px; }
    .pillar__title { font-size: 13px; }
    .pillar p { display: none; }

    /* products: a 2 x 2 grid of cards; details stay on desktop */
    .products__head { padding-top: 48px; }
    .products__panels { grid-template-columns: 1fr 1fr; gap: 12px; padding: 20px var(--gutter) 48px; }
    .pp {
        position: relative; display: block; padding: 0; border: 1px solid var(--line-2) !important;
        border-radius: 12px; overflow: hidden; background: var(--card);
    }
    .pp + .pp { border-top: 1px solid var(--line-2); }
    .pp__img { max-width: none; aspect-ratio: 4 / 3; border: 0; border-radius: 0; margin: 0; }
    .pp__title { font-size: 15px; line-height: 1.3; padding: 12px 12px 14px; max-width: none; }
    .pp__link::after { content: ""; position: absolute; inset: 0; }   /* whole card is the tap target */
    .pp__text, .facts, .pp__side { display: none; }
}
@media (max-width: 380px) { .pp__title { font-size: 14px; } }

/* featured products: a continuous strip, like the partner logos */
.marquee--products { margin-inline: calc(var(--gutter) * -1); }
.marquee__track--products { gap: 16px; animation-duration: 55s; }
.marquee__track--products li {
    flex: none; width: clamp(200px, 22vw, 290px); height: auto; padding: 0;
    background: none; box-shadow: none; border: 0; border-radius: 12px; display: block;
}
.marquee__track--products img { max-height: none; max-width: none; width: 100%; }
@media (max-width: 900px) { .marquee__track--products li { width: 46vw; } }
@media (prefers-reduced-motion: reduce) {
    .marquee--products { overflow-x: auto; }
    .marquee__track--products { flex-wrap: nowrap; justify-content: flex-start; width: max-content; }
}

/* ======================================================================
   Light mode, option A: the page reads light, but the three sections that
   carry the particle field (hero, product groups, contact) are deep navy
   "ink" bands. The page ground is navy; every reading section paints its
   own full-bleed light background, so the particles only show in the bands.
   ====================================================================== */
:root[data-theme="light"] { --navy: #142a5e; }
:root[data-theme="light"], :root[data-theme="light"] body { background: var(--navy); }
:root[data-theme="light"] main > section:not(.hero):not(.statement--sm):not(.products):not(.partners):not(.research):not(.faq):not(.chain):not(.contact) {
    background: var(--bg);
    box-shadow: 0 0 0 100vmax var(--bg);
    clip-path: inset(0 -100vmax);
}
:root[data-theme="light"] :is(.hero, .statement--sm, .products, .partners, .research, .faq, .contact) {
    --bg: #142a5e;
    --bg-2: #19326c;
    --bg-3: #203c7c;
    --text: #f3f6ff;
    --muted: #aab5cd;
    --dim: #8a97b3;
    --accent: #3b82f6;
    --accent-ink: #8cb6ff;
    --ink-rgb: 225, 232, 255;
    --scrim-rgb: 20, 42, 94;
    --word-dim: #4a5c88;
    --strong: #fff;
    --btn-bg: #ffffff; --btn-ink: #142a5e; --btn-hover: #e6edff;
    --card: rgba(25, 50, 108, 0.9);
    --shadow: rgba(0, 0, 0, 0.6);
    color: var(--text);
    color-scheme: dark;
}
:root[data-theme="light"] :is(.hero, .statement--sm, .products, .partners, .research, .faq, .contact) .btn--dark {
    background: var(--bg-3); color: var(--text); border-color: var(--line-2);
}
:root[data-theme="light"] :is(.hero, .statement--sm, .products, .partners, .research, .faq, .contact) .btn--dark:hover { background: var(--bg-3); border-color: rgba(var(--ink-rgb), 0.3); }
:root[data-theme="light"] .hero .sbg--hero img.is-on { opacity: 0.4; }
:root[data-theme="light"] .contact .sbg--contact img { opacity: 0.16; }
/* the navy ground shows between the frame rails; keep the rails subtle */
:root[data-theme="light"] main.frame { border-inline-color: rgba(225, 232, 255, 0.08); }

/* ======================================================================
   Slide edits 09/2026
   ====================================================================== */
.eyebrow { font: 500 12px/1 var(--mono); color: var(--accent-ink); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 14px; }

/* ---------- hero: one slide per product group ---------- */
.hs { display: grid; }
.hs__slide { grid-area: 1 / 1; opacity: 0; visibility: hidden; transition: opacity 600ms var(--ease), visibility 600ms; }
.hs__slide.is-on { opacity: 1; visibility: visible; }
.hs__kicker { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; font: 500 13px/1 var(--mono); color: var(--accent-ink); letter-spacing: 0.02em; }
.hs__kicker span { color: var(--text); padding-right: 12px; border-right: 1px solid var(--line-2); }
.btn--ghost { background: transparent; color: var(--text); border-color: rgba(var(--ink-rgb), 0.4); }
.btn--ghost:hover { border-color: var(--text); background: rgba(var(--ink-rgb), 0.06); }
.hs__nav { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin-top: 40px; }
.hs__nav button {
    position: relative; display: grid; gap: 6px; text-align: left; cursor: pointer;
    padding: 12px 0 0; background: none; border: 0; border-top: 1px solid var(--line-2);
    font: 500 12.5px/1.3 var(--sans); color: var(--dim); transition: color 200ms;
}
.hs__nav button span { font: 500 11px/1 var(--mono); }
.hs__nav button:hover, .hs__nav button[aria-current="true"] { color: var(--text); }
.hs__nav button[aria-current="true"] span { color: var(--accent-ink); }
.hs__nav i { position: absolute; left: 0; right: 0; top: -1px; height: 2px; background: var(--accent); transform: scaleX(0); transform-origin: 0 50%; }
.hs__nav button[aria-current="true"] i { transform: scaleX(1); }
@media (max-width: 560px) {
    .hs__nav { gap: 6px; margin-top: 28px; }
    .hs__nav button { font-size: 0; }
    .hs__nav button span { font-size: 12px; }
    .hs__kicker { font-size: 11.5px; }
}

/* ---------- key applications ---------- */
.domains { padding-block: 56px 20px; }
.domains__head { margin-bottom: 28px; }
.marquee--domains { margin-inline: calc(var(--gutter) * -1); }
.marquee__track--domains { gap: 16px; animation-duration: 42s; }
.marquee__track--domains li {
    flex: none; width: clamp(220px, 23vw, 300px); height: auto; padding: 0; display: block;
    background: none; box-shadow: none; border: 0; border-radius: 14px;
}
.domain { margin: 0; overflow: hidden; border: 1px solid var(--line-2); border-radius: 14px; background: var(--card); }
.marquee__track--domains img {
    width: 100%; max-width: none; max-height: none; aspect-ratio: 4 / 3; object-fit: cover; background: #fff;
    transition: transform 900ms var(--ease);
}
.marquee__track--domains img[data-fit="contain"] { object-fit: contain; padding: 14px; }
.domain:hover img { transform: scale(1.04); }
.domain figcaption { display: grid; gap: 4px; padding: 14px 16px 16px; }
.domain b { font: 600 16px/1.3 var(--sans); color: var(--text); }
.domain span { font-size: 13px; color: var(--muted); }
@media (max-width: 900px) { .marquee__track--domains li { width: 62vw; } }

/* statement: smaller, centred under the applications */
.statement--sm { padding-block: 28px 72px; }
.statement--sm .statement__text {
    font-size: clamp(18px, 1.65vw, 23px); line-height: 1.55; letter-spacing: -0.01em;
    max-width: 64ch; margin-inline: auto; text-align: center;
}

/* ---------- value chain ----------
   Wide + WebGL: a 3D fab line (value-chain-3d.js) with the captions below laid
   over the canvas (.vc--gl), alternating above / below the line. Otherwise: the
   CSS 3D floor, and on phones a list. The band is its own deep blue in both
   themes, matching the canvas clear colour. */
.chain {
    --bg: #0f2150; --bg-2: #13295e; --text: #f3f6ff; --muted: #b3c0dc; --dim: #8fa0c4;
    --accent-ink: #8cb6ff; --ink-rgb: 225, 232, 255; --scrim-rgb: 15, 33, 80; --line-2: rgba(225, 232, 255, 0.16);
    color: var(--text);
    padding-block: 64px 24px; overflow: hidden;
    background: var(--bg); box-shadow: 0 0 0 100vmax var(--bg); clip-path: inset(0 -100vmax);
}
.chain__head { text-align: center; max-width: 760px; margin-inline: auto; }

/* captions (shared) */
.vc__card {
    width: max-content; max-width: 190px; text-align: center; padding: 9px 13px 10px; border-radius: 10px;
    background: rgba(12, 27, 66, 0.9); border: 1px solid rgba(143, 184, 255, 0.32);
    transition: border-color 300ms, background-color 300ms, box-shadow 300ms, opacity 600ms var(--ease);
}
.vc__no { display: block; font: 500 11px/1 var(--mono); color: var(--accent-ink); margin-bottom: 5px; }
.vc__card h3 { font: 700 15px/1.2 var(--sans); color: var(--text); white-space: nowrap; }
.vc__vi { font: 11.5px/1.3 var(--mono); color: var(--dim); margin-top: 3px; white-space: nowrap; }
.vc__prod {
    display: flex; align-items: center; justify-content: center; gap: 6px;
    margin-top: 8px; padding-top: 7px; border-top: 1px solid rgba(143, 184, 255, 0.22);
    font: 600 12.5px/1.3 var(--sans); color: #cfe0ff;
}
.vc__prod img { width: 14px; height: 14px; object-fit: contain; flex: none; }
.vc__step--end .vc__card { border-color: rgba(143, 184, 255, 0.6); background: rgba(37, 99, 235, 0.28); }
.vc__step.is-active .vc__card { border-color: #8cb6ff; background: rgba(29, 78, 216, 0.55); box-shadow: 0 0 26px rgba(59, 130, 246, 0.45); }

/* CSS 3D floor (fallback without WebGL) */
.vc { --rx: 56deg; --rz: -5deg; position: relative; height: 470px; margin-top: 24px; perspective: 1500px; perspective-origin: 50% 0%; }
.vc__scene { position: absolute; left: 1%; right: 1%; top: 50px; height: 440px; transform-style: preserve-3d; transform: rotateX(var(--rx)) rotateZ(var(--rz)); }
.vc__floor {
    position: absolute; inset: -12% -8%;
    background:
        linear-gradient(rgba(59, 130, 246, 0.22) 1px, transparent 1px) 0 0 / 200px 200px,
        linear-gradient(90deg, rgba(59, 130, 246, 0.22) 1px, transparent 1px) 0 0 / 200px 200px,
        linear-gradient(rgba(225, 232, 255, 0.07) 1px, transparent 1px) 0 0 / 40px 40px,
        linear-gradient(90deg, rgba(225, 232, 255, 0.07) 1px, transparent 1px) 0 0 / 40px 40px;
    -webkit-mask-image: radial-gradient(ellipse 58% 55% at 50% 42%, #000 35%, transparent 78%);
            mask-image: radial-gradient(ellipse 58% 55% at 50% 42%, #000 35%, transparent 78%);
}
.vc__rail {
    position: absolute; left: 3%; right: 1%; top: 40%; height: 6px; margin-top: -3px; border-radius: 3px; overflow: hidden;
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.15), rgba(59, 130, 246, 0.85));
    box-shadow: 0 0 22px rgba(59, 130, 246, 0.55); transform: translateZ(1px);
}
.vc__rail i {
    position: absolute; top: 0; bottom: 0; left: 0; width: 18%;
    background: linear-gradient(90deg, transparent, #d6e7ff, transparent); animation: vc-pulse 3.6s linear infinite;
}
@keyframes vc-pulse { from { transform: translateX(-100%); } to { transform: translateX(560%); } }
.vc__steps { position: absolute; inset: 0; transform-style: preserve-3d; }
.vc__step { position: absolute; top: 40%; left: calc(6% + var(--i) * 14.6%); width: 0; height: 0; transform-style: preserve-3d; }
.vc__pad { position: absolute; left: -42px; top: -42px; width: 84px; height: 84px; transform-style: preserve-3d; }
.vc__pad i { position: absolute; display: block; transition: background-color 500ms, box-shadow 500ms, border-color 500ms; }
.vc__top { inset: 0; transform: translateZ(18px); border-radius: 6px; background: rgba(59, 130, 246, 0.14); border: 1px solid rgba(127, 176, 255, 0.45); box-shadow: inset 0 0 20px rgba(59, 130, 246, 0.25); }
.vc__front { left: 0; right: 0; bottom: 0; height: 18px; transform-origin: 50% 100%; transform: rotateX(-90deg); background: rgba(37, 99, 235, 0.32); border: 1px solid rgba(127, 176, 255, 0.35); }
.vc__side { top: 0; bottom: 0; right: 0; width: 18px; transform-origin: 100% 50%; transform: rotateY(90deg); background: rgba(29, 78, 216, 0.4); border: 1px solid rgba(127, 176, 255, 0.25); }
.vc__step--low::after { content: ""; position: absolute; left: -1px; top: 42px; width: 2px; height: 92px; background: repeating-linear-gradient(180deg, rgba(127, 176, 255, 0.8) 0 6px, transparent 6px 11px); }
.vc__card { position: absolute; left: 0; top: 0; transform-origin: 50% 100%; }
.vc__step--high .vc__card { transform: translate(-50%, -100%) translateZ(26px) rotateZ(calc(var(--rz) * -1)) rotateX(calc(var(--rx) * -1)); }
.vc__step--low .vc__card { transform: translate(-50%, -100%) translateY(210px) translateZ(2px) rotateZ(calc(var(--rz) * -1)) rotateX(calc(var(--rx) * -1)); }
/* reveal: opacity only (no CSS filters over the WebGL canvas) */
.vc.is-armed .vc__card { opacity: 0; }
.vc.is-live .vc__card { opacity: 1; transition-delay: 0s, 0s, 0s, calc(var(--i) * 140ms); }
.vc.is-live .vc__top { background: rgba(59, 130, 246, 0.34); border-color: #7fb0ff; box-shadow: inset 0 0 22px rgba(127, 176, 255, 0.45), 0 0 26px rgba(59, 130, 246, 0.45); transition-delay: calc(var(--i) * 140ms); }

/* WebGL mode: the canvas is the stage, captions are placed by JS.
   Nothing over the canvas uses mask-image, filter or backdrop-filter: on Intel/D3D11
   those re-composite the live canvas and can flash it black. */
.vc__gl { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; display: block; outline: none; }
.vc--gl { -webkit-user-select: none; user-select: none; -webkit-tap-highlight-color: transparent; }
.vc--gl::after {
    content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
    background:
        linear-gradient(180deg, var(--bg) 0, transparent 10%, transparent 84%, var(--bg) 100%),
        linear-gradient(90deg, var(--bg) 0, transparent 9%, transparent 91%, var(--bg) 100%);
}
@media (min-width: 901px) {
    .vc.vc--gl { height: clamp(400px, 37vw, 480px); perspective: none; margin-inline: calc(var(--gutter) * -1); margin-top: 8px; }
    .vc--gl .vc__scene { inset: 0; z-index: 2; height: auto; transform: none; pointer-events: none; }
    .vc--gl .vc__floor, .vc--gl .vc__rail, .vc--gl .vc__pad, .vc--gl .vc__step::after { display: none; }
    .vc--gl .vc__step { position: static; width: auto; height: auto; }
    .vc--gl .vc__card { transform-origin: 0 0; }
}
/* the fixed header and contact dock lose their backdrop blur while the stage is on screen */
.vc-onscreen .hdr, .vc-onscreen .fab__dock { -webkit-backdrop-filter: none; backdrop-filter: none; }
.vc-onscreen .hdr { background: rgba(var(--scrim-rgb), 0.97); }
:root[data-theme="light"].vc-onscreen .hdr { background: rgba(247, 250, 255, 0.98); }
.vc-onscreen .fab__dock { background: rgba(var(--scrim-rgb), 0.95); }
@media (max-width: 1180px) {
    .vc__card h3 { font-size: 13.5px; }
    .vc__prod { font-size: 11.5px; }
    .vc__card { max-width: 160px; }
}

/* phones: a vertical list */
@media (max-width: 900px) {
    .chain { padding-block: 48px; }
    .vc { height: auto; perspective: none; margin-top: 28px; }
    .vc__gl { display: none; }
    .vc__scene { position: relative; inset: auto; height: auto; transform: none; }
    .vc__floor, .vc__rail, .vc__pad, .vc__step::after { display: none; }
    .vc__steps { position: relative; display: grid; gap: 12px; padding-left: 22px; }
    .vc__steps::before { content: ""; position: absolute; left: 5px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(180deg, rgba(59, 130, 246, 0.3), #3b82f6); }
    .vc__step { position: relative; top: auto; left: auto; width: auto; height: auto; }
    .vc__step::before { content: ""; position: absolute; left: -22px; top: 50%; width: 12px; height: 12px; margin-top: -6px; border-radius: 50%; background: #3b82f6; box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.25); }
    .vc__card, .vc__step--high .vc__card, .vc__step--low .vc__card { position: static; transform: none; width: auto; max-width: none; text-align: left; }
    .vc__card h3, .vc__vi { white-space: normal; }
    .vc__prod { justify-content: flex-start; }
}
@media (prefers-reduced-motion: reduce) { .vc__rail i { animation: none; display: none; } }

/* ---------- products: five groups, bigger tabs with a cover ---------- */
.products.is-tabbed .tabs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.tab { min-height: 96px; padding: 16px 64px 20px 18px; font: 700 17px/1.25 var(--sans); color: var(--text); opacity: 0.72; }
.tab:hover, .tab[aria-selected="true"] { opacity: 1; }
.tab__no { font-size: 13px; }
.tab__cover {
    position: absolute; top: 12px; right: 12px; width: 44px; height: 44px; object-fit: cover;
    border-radius: 8px; border: 1px solid var(--line-2); background: #fff;
}
@media (max-width: 1080px) { .products.is-tabbed .tabs { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.pp__img[data-fit="contain"] { object-fit: contain; background: #fff; }
.pp__title { display: flex; align-items: center; gap: 16px; max-width: none; }
.pp__link { max-width: 20ch; }
.pp__no { color: var(--accent-ink); }
.pp__tap {
    flex: none; width: 46px; height: 38px; fill: none; stroke: var(--accent-ink); stroke-width: 1.7;
    stroke-linecap: round; stroke-linejoin: round;
    animation: pp-tap 1.4s var(--ease) infinite;
}
@keyframes pp-tap { 0%, 100% { translate: 0 0; } 50% { translate: -8px 0; } }
.spec { font-family: var(--sans); font-size: 14px; }
.spec__head { font: 600 13px/1 var(--sans); color: var(--text); }
.spec__meta { font: 500 12px/1 var(--mono); }
.spec__rows li { display: grid; grid-template-columns: 1fr; gap: 8px; padding: 12px 16px; }
.spec__cat { font: 600 13.5px/1.3 var(--sans); color: var(--text); }
.spec__items { display: flex; flex-wrap: wrap; gap: 6px; }
.spec__items em {
    font-style: normal; font-size: 12.5px; line-height: 1.3; color: var(--muted);
    padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line-2); background: rgba(var(--ink-rgb), 0.03);
}
@media (max-width: 900px) {
    .pp:first-child { grid-column: 1 / -1; }
    .pp:first-child .pp__img { aspect-ratio: 4 / 3; }
    .pp__title { display: block; }
    .pp__tap { display: none; }
    .pp__img[data-fit="contain"] { padding: 10px; }
}
@media (prefers-reduced-motion: reduce) { .pp__tap { animation: none; } }

/* ---------- team: field and institution, big, bold, blue ---------- */
.expert .expert__field { font: 700 17px/1.35 var(--sans); color: var(--accent-ink); margin-top: 6px; }
.expert .expert__org { font: 700 13px/1.4 var(--mono); color: var(--accent-ink); margin-top: 6px; }
.partners { padding-block: 40px 44px; }

/* ---------- research: four large journal covers ---------- */
.research { grid-template-columns: minmax(0, 1fr); }
.research__copy { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); column-gap: clamp(32px, 6vw, 96px); align-items: start; }
.research__copy .h2, .research__copy .lead { grid-column: 1; }
.research__copy .notes { grid-column: 2; grid-row: 1 / span 2; margin-top: 0; }
.pubs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(16px, 2vw, 28px); border: 0; border-radius: 0; background: none; overflow: visible; }
.pub { display: flex; flex-direction: column; gap: 14px; padding: 0; border: 0; background: none; }
.pub:hover { background: none; }
.pub img {
    width: 100%; height: auto; aspect-ratio: 202 / 270; object-fit: cover; border-radius: 8px;
    border: 1px solid var(--line-2); box-shadow: 0 26px 50px -26px var(--shadow);
    transition: transform 400ms var(--ease);
}
.pub:hover img { transform: translateY(-4px); }
.pub h3 { font: 600 15px/1.4 var(--sans); }
.pub__year { display: block; margin-bottom: 8px; }
@media (max-width: 900px) {
    .research__copy { grid-template-columns: 1fr; }
    .research__copy .notes { grid-column: 1; grid-row: auto; margin-top: 28px; }
    .pubs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) { .pub img { width: 100%; height: auto; } }

/* tabbed stage: keep the tallest group (6 categories) inside one screen */
.products.is-tabbed .tab { min-height: 84px; }
.products.is-tabbed .pp__img { aspect-ratio: auto; height: clamp(240px, 46vh, 430px); margin-bottom: 22px; }
.pp__img[src*="anhdaidien_binhphanung"] { object-position: 50% 0; }   /* keep the digifund logo (top-left) in frame */
.products.is-tabbed .pp__text { margin-top: 12px; }
.products.is-tabbed .facts { margin-top: 18px; gap: 8px; }
.products.is-tabbed .spec__rows li { padding: 9px 16px; gap: 6px; }
.pp__img[data-fit="contain"], .marquee__track--domains img[data-fit="contain"], .tab__cover[src*="app-packaging"] { background: #000; }

/* ======================================================================
   Consistency pass (team → footer), 09/2026
   ====================================================================== */
/* team: name leads, field in blue, institution quiet; links and logos share one baseline */
.expert { display: flex; flex-direction: column; }
.expert h3 { font: 700 18px/1.3 var(--sans); color: var(--text); margin-top: 18px; }
.expert .expert__field { font: 600 15px/1.4 var(--sans); color: var(--accent-ink); margin-top: 4px; }
.expert .expert__org { font: 13px/1.4 var(--sans); color: var(--dim); margin: 4px 0 16px; }
.expert > a { margin-top: auto; }
@media (max-width: 560px) {
    .expert h3 { font-size: 16px; }
    .expert .expert__field { font-size: 14px; }
}

/* the About statement matches the one under Key Applications */
.statement__text--sm {
    font-size: clamp(18px, 1.65vw, 23px); line-height: 1.55; letter-spacing: -0.01em;
    max-width: 64ch; margin-inline: auto; text-align: center;
}

/* partners: a regular section heading */
.partners__head { max-width: 780px; margin-bottom: 24px; }

/* journal covers: never wider than the source images (~200 px) */
.pubs { grid-template-columns: repeat(4, minmax(0, 220px)); justify-content: space-between; }
.pub img { max-width: 220px; }
@media (max-width: 900px) { .pubs { grid-template-columns: repeat(2, minmax(0, 220px)); justify-content: space-around; } }

/* featured products: whole photo on white (the catalog shots carry a logo in the corner) */
.gallery img { aspect-ratio: 1 / 1; object-fit: contain; background: #fff; }

/* contact headline is longer now */
.contact__title { max-width: 18ch; }

/* journal covers, layout A: 2 x 2 citation cards, cover left (never upscaled) */
.pubs { grid-template-columns: repeat(2, minmax(0, 1fr)); justify-content: stretch; gap: 16px; }
.pub {
    display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 22px; align-items: center;
    padding: 16px; border: 1px solid var(--line-2); border-radius: 12px; background: var(--bg-2);
    transition: border-color 250ms, box-shadow 250ms;
}
.pub:hover { background: var(--bg-2); border-color: rgba(59, 130, 246, 0.55); box-shadow: 0 24px 50px -30px var(--shadow); }
.pub img { width: 150px; max-width: none; height: auto; aspect-ratio: 202 / 270; box-shadow: 0 16px 30px -18px var(--shadow); }
.pub:hover img { transform: none; }
.pub h3 { font: 600 16px/1.45 var(--sans); }
.pub p { margin-top: 8px; }
@media (max-width: 900px) { .pubs { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 560px) {
    .pub { grid-template-columns: 92px minmax(0, 1fr); gap: 14px; padding: 12px; }
    .pub img { width: 92px; }
    .pub h3 { font-size: 14.5px; }
}

/* ======================================================================
   Light mode: alternating bands. Navy: hero, the wafer statement, product
   groups, featured products, about + numbers, contact. White: everything
   else, including the value-chain stage (pale, so the models stand out).
   ====================================================================== */
.statement--sm { padding-block: 64px; }
:root[data-theme="light"] .chain {
    --bg: #f7faff; --bg-2: #ffffff; --text: #0b1b3a; --muted: #44536b; --dim: #56667f;
    --accent-ink: #1d4ed8; --ink-rgb: 29, 78, 216; --scrim-rgb: 247, 250, 255; --line-2: rgba(29, 78, 216, 0.14);
}
:root[data-theme="light"] .vc__card {
    background: #e3edff; border-color: rgba(29, 78, 216, 0.28);
    box-shadow: 0 16px 34px -20px rgba(15, 33, 80, 0.35);
}
:root[data-theme="light"] .vc__card h3 { color: #0b1b3a; }
:root[data-theme="light"] .vc__vi { color: #56667f; }
:root[data-theme="light"] .vc__no { color: #1d4ed8; }
:root[data-theme="light"] .vc__prod { color: #1e3a8a; border-top-color: rgba(29, 78, 216, 0.15); }
:root[data-theme="light"] .vc__step--end .vc__card { background: #d6e4ff; border-color: rgba(29, 78, 216, 0.45); }
:root[data-theme="light"] .vc__step.is-active .vc__card { background: #1d4ed8; border-color: #1d4ed8; box-shadow: 0 16px 34px -14px rgba(29, 78, 216, 0.6); }
:root[data-theme="light"] .vc__step.is-active :is(h3, .vc__vi, .vc__no, .vc__prod) { color: #ffffff; }
:root[data-theme="light"] .vc__step.is-active .vc__prod { border-top-color: rgba(255, 255, 255, 0.3); }
/* the logo mark sits on a small white chip so it still reads on the active blue card (no CSS filters over the canvas) */
:root[data-theme="light"] .vc__step.is-active .vc__prod img { background: #ffffff; border-radius: 4px; padding: 1px; box-sizing: content-box; }

/* navy reading bands are opaque: the particle field only shows in hero, statement, products and contact */
:root[data-theme="light"] :is(.partners, .research, .faq, .ftr) { background: var(--bg); box-shadow: 0 0 0 100vmax var(--bg); clip-path: inset(0 -100vmax); }
/* featured products on a white band: the white photo cards need an edge */
:root[data-theme="light"] .gallery figure { border: 1px solid rgba(29, 78, 216, 0.14); box-shadow: 0 18px 36px -26px rgba(15, 33, 80, 0.35); }
/* research band is navy in light mode: the case-study panel is a white sheet on it */
:root[data-theme="light"] .research .apps {
    --text: #0b1b3a; --muted: #44536b; --dim: #56667f; --strong: #061230;
    --accent-ink: #1d4ed8; --ink-rgb: 29, 78, 216; --scrim-rgb: 247, 250, 255;
    --line: rgba(29, 78, 216, 0.1); --line-2: rgba(29, 78, 216, 0.18);
    --card: #ffffff; --bg: #f7faff; --bg-2: #ffffff;
    color: var(--text); border-color: transparent;
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.55);
}
/* light mode: contact form is a white sheet on the navy band; footer wordmark sits on a navy band */
:root[data-theme="light"] .contact__grid {
    --bg: #f7faff; --bg-2: #ffffff; --bg-3: #e9f1ff;
    --text: #0b1b3a; --muted: #44536b; --dim: #56667f; --strong: #061230;
    --accent: #2563eb; --accent-ink: #1d4ed8; --ink-rgb: 29, 78, 216; --scrim-rgb: 247, 250, 255;
    --line: rgba(29, 78, 216, 0.1); --line-2: rgba(29, 78, 216, 0.18);
    --btn-bg: #2563eb; --btn-ink: #ffffff; --btn-hover: #1d4ed8;
    background: #ffffff; color: var(--text); border-color: transparent; color-scheme: light;
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.55);
}
:root[data-theme="light"] .contact__grid .form__status.is-ok { color: #15803d; }
:root[data-theme="light"] .contact__grid .form__status.is-error { color: #dc2626; }
:root[data-theme="light"] .ftr__word {
    color: rgba(225, 232, 255, 0.12); background: #142a5e; padding-top: 0.12em;
    box-shadow: 0 0 0 100vmax #142a5e; clip-path: inset(0 -100vmax);
}
/* contact card: two tones, a pale form sheet and a blue info panel, so the white doesn't glare */
:root[data-theme="light"] .contact__grid { background: #eef4ff; padding: 0; gap: 0; overflow: hidden; }
:root[data-theme="light"] .contact__grid .form { padding: clamp(24px, 3vw, 40px); }
:root[data-theme="light"] .contact__grid .form :is(input, select, textarea) { background: #ffffff; border-color: rgba(29, 78, 216, 0.22); }
:root[data-theme="light"] .contact__grid .info {
    --text: #ffffff; --muted: #dbe6ff; --dim: #b9cbf5; --accent-ink: #ffffff;
    background: #1e3a8a; color: var(--text); padding: clamp(24px, 3vw, 40px);
}
:root[data-theme="light"] .contact__grid .info a:hover { text-decoration: underline; }

/* ---------- autoplay pause toggle (hero slides, product tabs) ---------- */
.ap {
    display: inline-grid; place-items: center; width: 34px; height: 34px; flex: none; cursor: pointer;
    border-radius: 999px; border: 1px solid var(--line-2); background: transparent; color: var(--muted);
    transition: color 200ms, border-color 200ms;
}
.ap:hover { color: var(--text); border-color: rgba(var(--ink-rgb), 0.4); }
.ap svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.ap .ap__play { fill: currentColor; stroke: none; }
.ap .ap__play, .ap[aria-pressed="true"] .ap__pause { display: none; }
.ap[aria-pressed="true"] .ap__play { display: block; }
.ap[hidden] { display: none; }
.hs__nav { grid-template-columns: repeat(5, minmax(0, 1fr)) auto; }
.hs__nav button.ap {   /* out-rank the .hs__nav button tab styling */
    display: inline-grid; align-self: end; gap: 0; padding: 0; border: 1px solid var(--line-2); border-radius: 999px; color: var(--muted);
}
.hs__nav button.ap:hover { color: var(--text); }
.products__head > .ap { display: none; }
.products.is-tabbed .products__head { position: relative; }
.products.is-tabbed .products__head > .ap:not([hidden]) { display: inline-grid; position: absolute; right: var(--gutter); top: calc(var(--hdr) + 16px); }

/* forms: required marker */
.req { color: #e5484d; }

/* ======================================================================
   Phones (≤560px): the floating dock becomes a bottom action bar —
   Gọi ngay · Nhắn Zalo · Gửi yêu cầu — with visible labels.
   ====================================================================== */
.fab__call { display: none; }
@media (max-width: 560px) {
    body { padding-bottom: calc(64px + env(safe-area-inset-bottom)); }
    .fab { left: 0; right: 0; bottom: 0; }
    .fab__dock {
        grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: 8px;
        padding: 8px 12px calc(8px + env(safe-area-inset-bottom));
        border-radius: 0; border-width: 1px 0 0;
    }
    .fab__btn {
        width: auto; height: 46px; border-radius: 10px; display: flex; align-items: center; justify-content: center; gap: 7px;
        text-decoration: none; color: var(--text);
    }
    .fab__btn:hover { transform: none; }
    .fab__btn::after {
        display: block; position: static; content: attr(data-tip); opacity: 1; transform: none;
        padding: 0; border: 0; background: none; box-shadow: none; color: inherit;
        font: 600 13.5px/1 var(--sans); white-space: nowrap;
    }
    .fab__chat[aria-expanded="true"]::after { display: block; content: "Đóng"; }
    .fab__call { display: flex; background: rgba(var(--ink-rgb), 0.05); border: 1px solid var(--line-2); }
    .fab__call svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linejoin: round; }
    .fab__zalo img { width: 22px; height: 22px; border-radius: 6px; }
    .fab__chat { color: #fff; }
    .fab__chat svg { width: 18px; height: 18px; }
    .fab .chat { left: 12px; right: 12px; width: auto; bottom: calc(100% + 10px); }
    /* the bar slides away instead of fading while the hero is on screen */
    .fab.is-hidden { transform: translateY(100%); }
}
@media (max-width: 360px) {
    .fab__dock { gap: 6px; padding-inline: 8px; }
    .fab__btn { gap: 5px; }
    .fab__btn::after { font-size: 12.5px; }
    .fab__call svg, .fab__chat svg { display: none; }
}
@media (max-width: 560px) {
    .ftr__word { font-size: 18vw; }   /* the 80px floor overflows narrow phones */
}
/* phones & tablets: the menu is a full-screen sheet under the header, CTA pinned last */
@media (max-width: 900px) {
    .menu-open, .menu-open body { overflow: hidden; }
    .menu-open .hdr { background: var(--bg); }
    .menu-open .fab { visibility: hidden; }
    .mnav:not([hidden]) {
        height: calc(100dvh - var(--hdr)); overflow-y: auto; overscroll-behavior: contain;
        align-content: start; background: var(--bg);
    }
    .mnav a:last-child {
        margin-top: 20px; border: 0; border-radius: 10px; text-align: center; font-weight: 600;
        background: var(--btn-bg); color: var(--btn-ink);
    }
}

/* ---------- product groups (wide screens): photo on the left at full height; title, copy,
   the "see all products" link and the catalogue card stacked on the right ---------- */
.products.is-tabbed .pp {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: clamp(32px, 4vw, 64px); row-gap: 0;
    grid-template-areas: "img title" "img text" "img facts" "img more" "img spec";
    grid-template-rows: auto auto auto auto 1fr; align-items: start;
}
.products.is-tabbed .pp__copy, .products.is-tabbed .pp__side { display: contents; }
.products.is-tabbed .pp__img {
    grid-area: img; align-self: stretch; width: 100%; max-width: none; height: auto; min-height: 300px; margin: 0;
    contain: size;   /* the photo takes the right column's height instead of driving it */
}
.products.is-tabbed .pp__title { grid-area: title; }
.products.is-tabbed .pp__text { grid-area: text; margin-top: 10px; }
.products.is-tabbed .facts { grid-area: facts; display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 14px; }
.products.is-tabbed .more--card {
    grid-area: more; justify-self: start; margin-top: 18px; padding: 10px 16px 10px 18px; border-radius: 999px;
    background: var(--btn-bg); color: var(--btn-ink); font-weight: 600; position: relative; z-index: 2;
}
.products.is-tabbed .more--card:hover { background: var(--btn-hover); color: var(--btn-ink); }
.products.is-tabbed .more--card svg { border-color: currentColor; }
.products.is-tabbed .spec { grid-area: spec; margin-top: 18px; }
/* the catalogue card reads as one row per category so the tallest group still fits one screen */
.products.is-tabbed .spec__rows li { grid-template-columns: minmax(120px, 34%) minmax(0, 1fr); align-items: center; column-gap: 14px; padding: 8px 16px; }
.products.is-tabbed .spec__cat { font-size: 13px; }
.products.is-tabbed .spec__items em { padding: 3px 9px; font-size: 12px; }
.products.is-tabbed .spec__foot { display: none; }
/* show the whole photo (several carry the digifund logo in a corner): no crop, padded with the photo's own ground */
.products.is-tabbed .pp__img { object-fit: contain; object-position: 50% 50%; background: #fff; }
.products.is-tabbed .pp__img[src*="app-packaging"] { background: #020409; }

/* founding year stands out */
.about__since .about__year { color: var(--accent-ink); font-weight: 700; font-size: 1.15em; }
/* VI / EN switch, same chip as the theme toggle */
.lang-switch {
    width: 34px; height: 34px; display: grid; place-items: center; flex: none; border-radius: 50%;
    border: 1px solid var(--line-2); color: var(--muted); text-decoration: none;
    font: 600 11.5px/1 var(--mono); letter-spacing: 0.04em; transition: color 200ms, border-color 200ms;
}
.lang-switch:hover { color: var(--text); border-color: rgba(var(--ink-rgb), 0.3); }
/* the header got one more chip (VI/EN): keep nav labels on one line and give them a little less air */
.hdr__nav a { white-space: nowrap; }
@media (max-width: 1480px) { .hdr__nav { gap: 22px; } .search { width: 240px; } }
@media (max-width: 1280px) { .hdr__nav { gap: 16px; } .search { width: 200px; } }
/* small laptops / tablets landscape: the search field folds into its icon button, as on phones */
@media (min-width: 901px) and (max-width: 1120px) {
    .hdr__search-btn { display: grid; }
    .search {
        display: none; position: absolute; left: var(--gutter); right: var(--gutter); top: calc(var(--hdr) + 8px);
        width: auto; height: 44px;
    }
    .hdr.is-searching .search { display: flex; background: var(--bg-2); }
    .search__results { left: 0; right: 0; width: auto; }
}