/* ============ lduongh v2.0 — editorial minimal ============ */
:root {
  --paper: #fafafa;
  --paper-alt: #f2f2f0;
  --ink: #141414;
  --muted: #6d6d6d;
  --line: #e6e6e3;
  --accent: #bb5c00;
  --accent-deep: #a85400;
  --accent-solid: #bb5c00;
  --btn-bg: #141414;
  --btn-text: #ffffff;
  --on-accent: #ffffff;
  --card: #ffffff;
  --maxw: 1160px;
  --narrow: 820px;
  --display: "Montserrat", -apple-system, "Segoe UI", sans-serif;
  --text: "Lato", -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0c0c0e;
    --paper-alt: #131316;
    --ink: #f4f4f2;
    --muted: #a3a3a3;
    --line: #26262b;
    --accent: #ff9d2e;
    --accent-deep: #ff9d2e;
    --accent-solid: #ff9d2e;
    --btn-bg: #f4f4f2;
    --btn-text: #0c0c0e;
    --on-accent: #0c0c0e;
    --card: #141417;
  }
}
:root[data-theme="dark"] {
  --paper: #0c0c0e;
  --paper-alt: #131316;
  --ink: #f4f4f2;
  --muted: #a3a3a3;
  --line: #26262b;
  --accent: #ff9d2e;
  --accent-deep: #ff9d2e;
  --accent-solid: #ff9d2e;
  --btn-bg: #f4f4f2;
  --btn-text: #0c0c0e;
  --on-accent: #0c0c0e;
  --card: #141417;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--text);
  background: var(--paper);
  color: var(--ink);
  font-size: 18px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-solid); color: var(--on-accent); }

/* Ambient geometric lattice rendered on a fixed canvas behind the page. */
#bgCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
main, .site-footer { position: relative; z-index: 1; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 2rem; }
.wrap.narrow { max-width: var(--narrow); }
.center { text-align: center; }

h1, h2, h3 { font-family: var(--display); line-height: 1.12; letter-spacing: -0.01em; }

section { scroll-margin-top: 84px; }
.section { padding: 7rem 0; }
.section.alt { background: var(--paper-alt); }

.kicker {
  font-family: var(--display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin-bottom: 1.2rem;
}

.section h2 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-weight: 600;
  margin-bottom: 2rem;
}

.section-note {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 620px;
  margin-bottom: 3rem;
}
.center .section-note { margin-left: auto; margin-right: auto; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .work-thumb img, .work-card:hover .work-thumb img { transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- nav ---------- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 72px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.site-nav.scrolled { border-bottom-color: var(--line); }

.nav-logo { display: inline-flex; color: var(--ink); transition: color 0.25s ease; }
.nav-logo:hover { color: var(--accent); }
.logo-light { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .logo-dark { display: none; }
  :root:not([data-theme="light"]) .logo-light { display: inline-block; }
}
:root[data-theme="dark"] .logo-dark { display: none; }
:root[data-theme="dark"] .logo-light { display: inline-block; }

.hero-role .arrow { color: var(--accent); font-weight: 400; }
.nav-actions { display: flex; align-items: center; gap: 1rem; }
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 50%;
  background: transparent; border: 2px solid var(--line);
  color: var(--ink); cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.theme-toggle:hover { border-color: var(--accent-solid); color: var(--accent); transform: translateY(-2px); }
.theme-toggle svg { display: none; }
.theme-toggle[data-state="auto"] .tt-auto { display: block; }
.theme-toggle[data-state="light"] .tt-sun { display: block; }
.theme-toggle[data-state="dark"] .tt-moon { display: block; }

.nav-links { display: flex; gap: 2.2rem; }
.nav-links a {
  color: var(--ink); text-decoration: none;
  font-family: var(--display); font-size: 0.85rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  position: relative;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px; background: var(--accent);
  transition: width 0.25s ease;
}
.nav-links a:hover::after { width: 100%; }

.btn-connect {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--display); font-size: 0.85rem; font-weight: 700;
  letter-spacing: 0.06em; text-decoration: none;
  color: var(--ink); background: transparent;
  border: 2px solid var(--accent-solid);
  padding: 0.55rem 1.2rem; border-radius: 999px;
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}
.btn-connect:hover { background: var(--accent-solid); color: var(--on-accent); border-color: var(--accent-solid); transform: translateY(-1px); }

/* ---------- hero ---------- */
.hero {
  min-height: 100svh;
  display: flex; flex-direction: column; justify-content: center;
  padding: 9rem 0 4rem; position: relative; overflow: hidden;
}
.hero-grid {
  display: grid; grid-template-columns: 7fr 5fr;
  gap: 4rem; align-items: stretch; position: relative;
}
.hero-mark { margin-bottom: 1.6rem; }
.eyebrow {
  font-family: var(--display); font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 1.4rem;
}
.eyebrow::before {
  content: ""; display: inline-block; width: 2.2rem; height: 2px;
  background: var(--accent); vertical-align: middle; margin-right: 0.8rem;
}
.hero h1 {
  font-size: clamp(3.8rem, 10vw, 7.5rem);
  font-weight: 600; letter-spacing: -0.03em; line-height: 0.98;
  margin-bottom: 1.4rem;
}
.hero-role {
  font-family: var(--display); font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  font-weight: 600; margin-bottom: 1.4rem;
}
.hero-role .amp { color: var(--accent-deep); font-weight: 400; }
.hero-lede { color: var(--muted); font-size: 1.1rem; max-width: 34rem; margin-bottom: 2.2rem; }

.hero-socials { display: flex; gap: 0.8rem; }
.hero-socials a {
  width: 46px; height: 46px; border-radius: 50%;
  background: transparent; color: var(--ink);
  border: 2px solid var(--accent-solid);
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.25s ease;
}
.hero-socials a:hover { background: var(--accent-solid); color: var(--on-accent); border-color: var(--accent-solid); transform: translateY(-2px); }

.hero-photo { display: flex; }
.hero-photo img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  clip-path: polygon(12% 0, 100% 0, 100% 88%, 88% 100%, 0 100%, 0 12%);
  filter: grayscale(18%);
}

.scroll-cue {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2px solid var(--muted);
  border-radius: 14px; display: block; opacity: 0.7;
}
.scroll-cue span {
  display: block; width: 4px; height: 8px; border-radius: 2px;
  background: var(--accent); margin: 7px auto 0;
  animation: cue 1.8s ease-in-out infinite;
}
@keyframes cue { 0%,100% { transform: translateY(0); opacity: 1; } 50% { transform: translateY(10px); opacity: 0.3; } }

/* ---------- about ---------- */
.about-body p { margin-bottom: 1.4rem; color: var(--ink); font-size: 1.08rem; }
.about-body p:first-child { font-size: 1.25rem; }
.fact-row {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
  margin-top: 3rem; padding-top: 2.2rem; border-top: 1px solid var(--line);
}
.fact-row dt {
  font-family: var(--display); font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent-deep); margin-bottom: 0.4rem;
}
.fact-row dd { font-weight: 700; font-size: 1.02rem; }

/* ---------- expertise ---------- */
.expert-list {
  list-style: none; margin-top: 1rem;
  display: grid; grid-template-columns: 1fr 1fr; column-gap: 3rem;
  border-bottom: 1px solid var(--line);
}
.expert-list li {
  display: grid; grid-template-columns: 56px 1fr; gap: 1.2rem;
  padding: 2rem 0; border-top: 1px solid var(--line);
  transition: padding 0.25s ease;
}
.expert-list li:hover { padding-left: 0.6rem; }
.expert-list .num {
  font-family: var(--display); font-weight: 300; font-size: 1rem;
  color: var(--accent-deep); letter-spacing: 0.1em; padding-top: 0.35rem;
}
.expert-list h3 {
  font-size: 1.35rem; font-weight: 600; margin-bottom: 0.5rem;
}
.expert-list p { color: var(--muted); max-width: 640px; }

/* ---------- timeline ---------- */
.timeline { position: relative; margin-top: 1rem; padding-left: 2px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 12px; bottom: 12px;
  width: 2px; background: var(--line);
}
.t-row { position: relative; padding-left: 2.6rem; margin-bottom: 0.4rem; }
.t-toggle {
  width: 100%; background: none; border: none; cursor: pointer;
  display: grid; grid-template-columns: 1fr auto auto; gap: 1.4rem;
  align-items: baseline; text-align: left; padding: 1.3rem 0;
  font-family: var(--text); color: var(--ink);
}
.t-dot {
  position: absolute; left: 2px; top: 1.75rem;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--paper); border: 3px solid var(--accent);
  transition: background 0.25s ease;
}
.t-row:first-child .t-dot { background: var(--accent); box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 18%, transparent); }
.t-main strong { display: block; font-family: var(--display); font-size: 1.2rem; font-weight: 600; }
.t-co { color: var(--muted); font-size: 0.98rem; }
.t-date {
  font-family: var(--display); font-size: 0.78rem; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted); white-space: nowrap;
}
.t-plus {
  font-size: 1.6rem; font-weight: 300; color: var(--accent-deep);
  line-height: 1; transition: transform 0.25s ease;
}
.t-toggle[aria-expanded="true"] .t-plus { transform: rotate(45deg); }
.t-toggle:hover .t-main strong { color: var(--accent-deep); }
.t-detail { max-height: 0; overflow: hidden; transition: max-height 0.45s ease; }
.t-detail p { color: var(--muted); margin-bottom: 0.7rem; padding-right: 2rem; }
.t-detail ul { list-style: disc; padding: 0 2rem 1.6rem 1.3rem; color: var(--muted); }
.t-detail li { margin-bottom: 0.4rem; }

/* ---------- education ---------- */
.edu-block { margin-top: 4.5rem; }
.edu-block h3 { font-size: 1.5rem; font-weight: 600; margin-bottom: 1.4rem; }
.edu-list { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.edu-list li {
  display: flex; gap: 1.2rem; align-items: baseline;
  padding: 0.8rem 0; border-top: 1px solid var(--line);
}
.edu-list li span {
  font-family: var(--display); font-size: 0.8rem; font-weight: 700;
  color: var(--accent-deep); min-width: 64px;
}

/* ---------- selected work ---------- */
.work-grid {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem; margin-top: 1rem;
}
.work-card {
  border: 1px solid var(--line); border-radius: 14px;
  padding: 0 0 2rem; background: var(--card); overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease;
  display: block; color: inherit; text-decoration: none;
}
.work-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.work-thumb { display: block; overflow: hidden; aspect-ratio: 16/10; border-bottom: 1px solid var(--line); }
.work-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: left center; display: block; transition: transform 0.4s ease; }
.work-card:hover .work-thumb img { transform: scale(1.04); }
.work-card .work-arrow { color: var(--accent-deep); font-weight: 400; }

/* ---------- case study pages ---------- */
.case-hero { padding: 9rem 0 3rem; }
.case-hero h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); margin-bottom: 1.4rem; max-width: 900px; }
.case-lede { font-size: 1.25rem; color: var(--muted); max-width: 820px; line-height: 1.65; }
.case-meta {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem;
  margin: 3rem 0 0; padding: 2rem 0 0; border-top: 1px solid var(--line);
}
.case-meta h2 { font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent-deep); margin-bottom: 0.6rem; }
.case-meta p { font-size: 0.98rem; line-height: 1.6; }
.case-body { padding: 0 0 6rem; }
.case-body h2 { font-size: clamp(1.7rem, 3vw, 2.2rem); margin: 4.5rem 0 1.2rem; }
.case-body h3 { font-size: 1.35rem; margin: 2.8rem 0 0.9rem; }
.case-body p { max-width: 760px; margin-bottom: 1.2rem; }
.case-body ul { max-width: 760px; margin: 0 0 1.2rem 1.4rem; }
.case-body li { margin-bottom: 0.5rem; }
.case-figure { margin: 2.2rem 0 2.8rem; }
.case-figure img { width: 100%; height: auto; display: block; border: 1px solid var(--line); border-radius: 14px; }
.case-figure figcaption { color: var(--muted); font-size: 0.92rem; margin-top: 0.7rem; text-align: center; }
.case-screens { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; margin: 2.2rem 0 2.8rem; }
.case-screens.four { grid-template-columns: repeat(4, 1fr); }
.case-screens figure { margin: 0; }
.case-screens img { width: 100%; height: auto; display: block; border: 1px solid var(--line); border-radius: 14px; }
.case-screens figcaption { color: var(--muted); font-size: 0.88rem; margin-top: 0.6rem; text-align: center; }
.case-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; margin: 2.2rem 0 2.8rem; max-width: 760px; }
.case-stats.three { grid-template-columns: repeat(3, 1fr); }
.case-stats.four { grid-template-columns: repeat(4, 1fr); }
.case-stat { border: 1px solid var(--line); border-radius: 14px; padding: 1.8rem; background: var(--card); }
.case-stat .num { font-family: var(--display); font-size: 2.4rem; font-weight: 700; color: var(--accent-deep); line-height: 1.1; }
.case-stat p { margin: 0.5rem 0 0; font-size: 0.98rem; color: var(--muted); }
.scenario-card { border: 1px solid var(--line); border-radius: 14px; padding: 2rem; background: var(--card); margin: 0 0 1.5rem; display: grid; grid-template-columns: 360px 1fr; gap: 0.25rem 2rem; align-items: start; }
.scenario-card h3 { margin-top: 0; margin-bottom: 0; grid-column: 2; grid-row: 1; }
.scenario-card .scenario-lines { grid-column: 2; grid-row: 2 / span 3; }
.scenario-card .scenario-lines p { margin: 0 0 0.6rem; }
.scenario-card .scenario-lines p:last-child { margin-bottom: 0; }
.scenario-card .scenario-data-head { margin-top: 2.2rem; font-weight: 700; }
.scenario-card li strong { color: var(--ink); }
.scenario-video { display: block; width: 100%; max-width: 360px; border: 1px solid var(--line); border-radius: 14px; grid-column: 1; grid-row: 1 / span 4; }
.case-cta { margin-top: 4.5rem; padding: 2.8rem 2rem; border: 1px solid var(--line); border-radius: 14px; background: var(--card); text-align: center; }
.case-cta p { font-size: 1.4rem; font-weight: 600; margin: 0 0 1.4rem; }
.case-cta .btn-connect { font-size: 0.95rem; padding: 0.7rem 1.5rem; }
.case-icon-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2.5rem; margin: 2.5rem 0 3rem; text-align: center; }
.case-icon-row.two { grid-template-columns: repeat(2, 1fr); }
.case-icon-row.four { grid-template-columns: repeat(4, 1fr); }
.case-icon-row svg { width: 56px; height: 56px; margin-bottom: 1.2rem; }
.case-icon-row h3 { font-size: 1.25rem; margin: 0 0 0.6rem; }
.case-icon-row p { margin: 0; font-size: 1rem; line-height: 1.65; }
.case-callout { background: var(--paper-alt); padding: 3rem 2rem; text-align: center; margin: 2.5rem 0; font-size: 1.15rem; line-height: 1.6; }
.case-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; flex-wrap: wrap; }
.case-nav a { color: var(--accent-deep); text-decoration: none; font-weight: 700; }
.case-nav a:hover { text-decoration: underline; }
@media (max-width: 900px) {
  .case-meta { grid-template-columns: repeat(2, 1fr); }
  .case-screens { grid-template-columns: repeat(2, 1fr); }
  .case-screens.four { grid-template-columns: repeat(2, 1fr); }
  .case-stats { grid-template-columns: 1fr; }
  .case-stats.three, .case-stats.four { grid-template-columns: repeat(2, 1fr); }
  .case-icon-row { grid-template-columns: 1fr; gap: 2rem; }
  .case-icon-row.two, .case-icon-row.four { grid-template-columns: repeat(2, 1fr); }
  .scenario-card { grid-template-columns: 1fr; }
  .scenario-card h3 { grid-column: 1; grid-row: 1; }
  .scenario-card .scenario-video { grid-column: 1; grid-row: 2; }
  .scenario-card .scenario-lines { grid-column: 1; grid-row: 3; }
}
@media (max-width: 560px) {
  .case-meta { grid-template-columns: 1fr; }
  .case-stats.three, .case-stats.four { grid-template-columns: 1fr; }
}
.work-card h3 { font-size: 1.3rem; font-weight: 600; margin: 1.6rem 0 0.5rem; padding: 0 2rem; }
.work-card p { color: var(--muted); padding: 0 2rem; }

/* ---------- kind words ---------- */
.quotes-grid { display: grid; grid-template-columns: 1fr; gap: 1.6rem; margin-bottom: 2.5rem; }
.quote-card {
  border: 1px solid var(--line); border-radius: 14px;
  padding: 2.4rem 2rem; background: var(--card);
  display: flex; flex-direction: column; justify-content: space-between;
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.quote-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.quote-card blockquote {
  font-family: var(--display); font-size: 1.28rem; font-weight: 600;
  line-height: 1.45; letter-spacing: -0.01em; margin-bottom: 1.8rem;
}
.quote-card blockquote::before {
  content: "\201C"; display: block;
  font-size: 3.2rem; line-height: 1; color: var(--accent);
  margin-bottom: 0.6rem; font-weight: 700;
}
.quote-card figcaption strong { display: block; font-family: var(--display); font-size: 1rem; font-weight: 700; }
.quote-card figcaption span { color: var(--muted); font-size: 0.88rem; }
.quotes-note { color: var(--muted); }
.quotes-note a { color: var(--accent-deep); }

/* ---------- credo ---------- */
/* Corner triangles are painted to match the neighboring sections
   (kind words above uses --paper, contact below uses --paper) so the
   45 degree cuts blend seamlessly instead of showing the page bg. */
.credo {
  background:
    linear-gradient(to bottom right, var(--paper) 50%, transparent 50%) top left / 84px 84px no-repeat,
    linear-gradient(to bottom right, transparent 50%, var(--paper) 50%) bottom right / 84px 84px no-repeat,
    repeating-linear-gradient(45deg, rgba(22,22,22,0.05) 0 2px, transparent 2px 18px),
    var(--accent);
  color: #fff;
  padding: clamp(5rem, 11vw, 8rem) 0;
}
.credo-kicker {
  font-family: var(--display); font-size: 0.8rem; font-weight: 700;
  letter-spacing: 0.28em; text-transform: uppercase;
  color: #fff; margin-bottom: 1.2rem;
}
.credo-line {
  font-family: var(--display);
  font-size: clamp(2.1rem, 5.4vw, 3.9rem);
  font-weight: 600; line-height: 1.16; letter-spacing: -0.02em;
}
.credo-line mark {
  background: #fff; color: var(--accent);
  padding: 0.03em 0.3em;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .credo,
  :root:not([data-theme="light"]) .credo-kicker { color: #000; }
  :root:not([data-theme="light"]) .credo-line mark { background: #000; }
}
:root[data-theme="dark"] .credo,
:root[data-theme="dark"] .credo-kicker { color: #000; }
:root[data-theme="dark"] .credo-line mark { background: #000; }

/* ---------- contact ---------- */
#contactForm { max-width: 560px; margin: 0 auto; text-align: left; }
.field { margin-bottom: 1.8rem; }
.field label {
  display: block; font-family: var(--display); font-size: 0.75rem;
  font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 0.5rem;
}
.field input, .field textarea {
  width: 100%; background: transparent; border: none;
  border-bottom: 2px solid var(--line);
  padding: 0.7rem 0.1rem; font-family: var(--text); font-size: 1.05rem;
  color: var(--ink); transition: border-color 0.25s ease; border-radius: 0;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field textarea:focus { outline: none; border-bottom-color: var(--accent-deep); }
#contactForm button {
  display: inline-flex; align-items: center; gap: 0.6rem;
  background: transparent; color: var(--ink);
  border: 2px solid var(--accent-solid); cursor: pointer;
  font-family: var(--display); font-weight: 700; font-size: 1rem;
  letter-spacing: 0.04em; padding: 0.9rem 2.3rem; border-radius: 999px;
  transition: transform 0.25s ease, background 0.25s ease, color 0.25s ease;
}
#contactForm button:hover { background: var(--accent-solid); color: var(--on-accent); border-color: var(--accent-solid); transform: translateY(-2px); }
.form-status { margin-top: 1.2rem; min-height: 1.6em; color: var(--muted); }

.socials { display: flex; gap: 0.9rem; justify-content: center; margin-top: 3.5rem; }
.socials a {
  width: 46px; height: 46px; border-radius: 50%;
  background: transparent; color: var(--ink);
  border: 2px solid var(--accent-solid);
  display: inline-flex; align-items: center; justify-content: center;
  transition: all 0.25s ease;
}
.socials a:hover { background: var(--accent-solid); color: var(--on-accent); border-color: var(--accent-solid); transform: translateY(-3px); }

/* ---------- external link indicator (HDN pattern, brand colors) ---------- */
.ext-icon { flex-shrink: 0; width: 9px; height: 9px; }
/* Superscript position next to inline text links. */
.quotes-note a .ext-icon { vertical-align: super; margin-left: 0.22em; }


/* ---------- keyboard focus ---------- */
:focus-visible { outline: 2px solid var(--accent-deep); outline-offset: 3px; border-radius: 6px; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 2.5rem 0; }
.site-footer > .wrap { max-width: none; }
.foot-logo { display: flex; justify-content: center; margin-bottom: 1.6rem; color: var(--ink); transition: color 0.25s ease; }
.foot-logo:hover { color: var(--accent); }
.foot-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.site-footer p { color: var(--muted); font-size: 0.92rem; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 3rem; }
  .hero-photo { max-width: none; }
  .hero-photo img { height: auto; aspect-ratio: 1 / 1; }
  .hero { padding-top: 7.5rem; }
  .fact-row { grid-template-columns: 1fr; gap: 1.2rem; }
  .expert-list { grid-template-columns: 1fr; }
  .expert-list li { grid-template-columns: 56px 1fr; gap: 1.2rem; }
  .work-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .section { padding: 4.5rem 0; }
  .t-date { display: none; }
  .t-toggle { grid-template-columns: 1fr auto; }
  .edu-list { grid-template-columns: 1fr; }
  .scroll-cue { display: none; }
  .foot-row { flex-direction: column; text-align: center; gap: 0.4rem; }
}