/* ============================================================
   Mingrui Ye — portfolio v2
   Modern, professional, clean. Image-forward, minimal copy.
   ============================================================ */

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --ink: #0e0e10;
  --ink-2: #55555e;
  --ink-3: #8e8e98;
  --hairline: #e6e6ea;
  --hairline-2: #d9d9df;
  --accent: #2557d6;
  --green: #0d8a4f;
  --radius: 14px;

  --font: "Instrument Sans", -apple-system, "Helvetica Neue", Arial, sans-serif;

  --w: 1180px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--ink); color: #fff; }

a { color: inherit; text-decoration: none; cursor: pointer; }
img, svg { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }

.wrap { max-width: var(--w); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }

/* ---------- micro type ---------- */

.eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-2);
}
.status .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-3); flex: none; }
.status--live { color: var(--green); }
.status--live .dot { background: var(--green); animation: pulse 2.4s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1 } 50% { opacity: .3 } }

/* ---------- header ---------- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.site-head__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand { font-weight: 700; font-size: 1rem; letter-spacing: -0.01em; }
.brand span { color: var(--ink-3); font-weight: 500; }

.site-nav { display: flex; gap: 1.75rem; align-items: center; font-size: 0.9rem; font-weight: 500; }
.site-nav a { color: var(--ink-2); transition: color .18s; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav .cta {
  color: #fff;
  background: var(--ink);
  padding: 0.5rem 1rem;
  border-radius: 99px;
  transition: transform .2s var(--ease), background .2s;
}
.site-nav .cta:hover { background: #000; color: #fff; transform: translateY(-1px); }

/* ---------- reveal ---------- */

html.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
html.js .reveal.in-view, .reveal.in-view { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .07s; }
.reveal[data-delay="2"] { transition-delay: .14s; }
.reveal[data-delay="3"] { transition-delay: .21s; }

/* ---------- hero ---------- */

.hero { padding-top: clamp(4rem, 9vw, 7.5rem); padding-bottom: clamp(2.5rem, 5vw, 4rem); }
.hero .eyebrow { display: flex; align-items: center; gap: .6rem; margin-bottom: 1.5rem; }
.hero .eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--hairline-2); }
.hero h1 {
  font-size: clamp(2.5rem, 6.5vw, 4.6rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.03;
  max-width: 17ch;
}
.hero h1 .dim { color: var(--ink-3); }
.hero .sub {
  margin-top: 1.5rem;
  font-size: clamp(1.02rem, 1.5vw, 1.18rem);
  color: var(--ink-2);
  max-width: 52ch;
}
.hero .actions { margin-top: 2.2rem; display: flex; gap: 0.8rem; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.72rem 1.4rem;
  border-radius: 99px;
  border: 1px solid transparent;
  transition: transform .2s var(--ease), box-shadow .2s, background .2s, border-color .2s;
}
.btn--primary { background: var(--ink); color: #fff; }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.14); }
.btn--ghost { border-color: var(--hairline-2); color: var(--ink); background: transparent; }
.btn--ghost:hover { border-color: var(--ink); }
.btn .arr { transition: transform .2s var(--ease); }
.btn:hover .arr { transform: translateX(3px); }

/* ---------- metric strip ---------- */

.metrics {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
}
.metrics__inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-top: 1.6rem;
  padding-bottom: 1.6rem;
}
.metric { padding: 0.2rem 1.4rem; border-left: 1px solid var(--hairline); }
.metric:first-child { border-left: none; padding-left: 0; }
.metric .n {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.metric .l { font-size: 0.8rem; color: var(--ink-3); margin-top: 0.1rem; }
@media (max-width: 820px) {
  .metrics__inner { grid-template-columns: 1fr 1fr; row-gap: 1.4rem; }
  .metric:nth-child(3) { border-left: none; padding-left: 0; }
}

/* ---------- section head ---------- */

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2.2rem;
}
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; letter-spacing: -0.03em; }

/* ---------- browser frame ---------- */

.frame {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 2px rgba(14,14,16,.04), 0 12px 40px -12px rgba(14,14,16,.1);
  transition: box-shadow .35s var(--ease), transform .35s var(--ease);
}
a:hover > .frame, a:focus-visible > .frame {
  transform: translateY(-4px);
  box-shadow: 0 2px 4px rgba(14,14,16,.05), 0 24px 60px -16px rgba(14,14,16,.18);
}
.frame__bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--hairline);
  background: #fcfcfd;
}
.frame__dots { display: flex; gap: 5px; }
.frame__dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--hairline-2); }
.frame__url {
  flex: 1;
  max-width: 380px;
  margin: 0 auto;
  text-align: center;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--ink-3);
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 0.22rem 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.frame__img { position: relative; overflow: hidden; aspect-ratio: 16 / 10; background: #f2f2f4; }
.frame__img img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: top center;
  transition: transform 1.2s var(--ease);
}
a:hover .frame__img img { transform: scale(1.025); }

/* ---------- work rows ---------- */

.work { padding-top: clamp(3.5rem, 7vw, 6rem); }
.work-list { display: flex; flex-direction: column; gap: clamp(3.5rem, 7vw, 5.5rem); }

.work-row {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(1.8rem, 4vw, 3.6rem);
  align-items: center;
}
.work-row:nth-child(even) .work-row__media { order: 2; }
.work-row__media { min-width: 0; display: block; }
.work-row__body { min-width: 0; }
.work-row__body .idx { font-size: 0.78rem; font-weight: 600; color: var(--ink-3); letter-spacing: .06em; }
.work-row__body h3 {
  margin-top: 0.5rem;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
}
.work-row__body .one-liner { margin-top: 0.7rem; color: var(--ink-2); font-size: 1.02rem; max-width: 40ch; }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.2rem; }
.chip {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.32rem 0.7rem;
  border-radius: 99px;
  background: var(--surface);
  border: 1px solid var(--hairline-2);
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.chip b { color: var(--ink); font-weight: 700; }
.work-row__links { margin-top: 1.5rem; display: flex; gap: 1.4rem; align-items: center; font-weight: 600; font-size: 0.92rem; }
.link-arrow { display: inline-flex; align-items: center; gap: 0.4rem; position: relative; }
.link-arrow::after {
  content: ""; position: absolute; left: 0; bottom: -3px; height: 1.5px; width: 100%;
  background: var(--ink); transform: scaleX(0); transform-origin: right;
  transition: transform .3s var(--ease);
}
.link-arrow:hover::after { transform: scaleX(1); transform-origin: left; }
.link-arrow .arr { transition: transform .2s var(--ease); }
.link-arrow:hover .arr { transform: translateX(3px); }
.link-ext { color: var(--ink-3); font-weight: 500; transition: color .18s; }
.link-ext:hover { color: var(--accent); }

@media (max-width: 900px) {
  .work-row { grid-template-columns: 1fr; gap: 1.4rem; }
  .work-row:nth-child(even) .work-row__media { order: 0; }
}

/* ---------- about teaser / contact ---------- */

.strip {
  margin-top: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--hairline);
  background: var(--surface);
  padding: clamp(3rem, 6vw, 5rem) 0;
}
.strip__inner { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,1fr); gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.strip h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; letter-spacing: -0.03em; max-width: 20ch; }
.strip p { margin-top: 1rem; color: var(--ink-2); max-width: 50ch; }
.cred-list { display: flex; flex-direction: column; }
.cred {
  display: grid; grid-template-columns: 6.2rem 1fr; gap: 1rem;
  padding: 0.85rem 0; border-bottom: 1px solid var(--hairline);
  font-size: 0.94rem;
}
.cred:first-child { border-top: 1px solid var(--hairline); }
.cred .k { color: var(--ink-3); font-size: 0.82rem; font-weight: 600; padding-top: .12rem; }
.cred .v b { font-weight: 600; }
.cred .v span { color: var(--ink-3); }
@media (max-width: 820px) { .strip__inner { grid-template-columns: 1fr; } }

/* ---------- footer ---------- */

.site-foot { border-top: 1px solid var(--hairline); padding: 2.2rem 0 2.6rem; }
.site-foot__inner { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; }
.site-foot .who { font-weight: 600; font-size: 0.95rem; }
.site-foot .who span { color: var(--ink-3); font-weight: 500; }
.foot-links { display: flex; gap: 1.4rem; font-size: 0.9rem; font-weight: 500; color: var(--ink-2); }
.foot-links a:hover { color: var(--ink); }

/* ============================================================
   Case pages
   ============================================================ */

.case-hero { padding: clamp(3.2rem, 7vw, 5.5rem) 0 clamp(2rem, 4vw, 3rem); }
.case-hero .crumbs { display: flex; align-items: center; gap: 0.6rem; font-size: 0.85rem; font-weight: 500; color: var(--ink-3); margin-bottom: 1.6rem; }
.case-hero .crumbs a:hover { color: var(--ink); }
.case-hero .crumbs .sep { color: var(--hairline-2); }
.case-hero h1 { font-size: clamp(2.2rem, 5.4vw, 3.8rem); font-weight: 700; letter-spacing: -0.035em; line-height: 1.04; }
.case-hero .titlebar { display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }
.case-hero .sub { margin-top: 1.1rem; font-size: clamp(1rem, 1.5vw, 1.15rem); color: var(--ink-2); max-width: 56ch; }
.case-hero .case-actions { margin-top: 1.8rem; display: flex; gap: 0.8rem; flex-wrap: wrap; align-items: center; }

.case-media { margin-top: clamp(1.6rem, 3.5vw, 2.6rem); }
.case-media .frame__img { aspect-ratio: 16 / 9.2; }

.case-metrics {
  margin-top: clamp(2rem, 4.5vw, 3.2rem);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  border-top: 1px solid var(--hairline);
}
.case-metrics .metric { border-left: none; border-right: 1px solid var(--hairline); padding: 1.3rem 1.3rem 1.3rem 0; margin-right: 1.3rem; }
.case-metrics .metric:last-child { border-right: none; }

.case-cols {
  padding: clamp(2.6rem, 5.5vw, 4.2rem) 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: clamp(1.8rem, 4vw, 3rem);
}
.case-col h2 {
  font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em;
  padding-bottom: 0.8rem; margin-bottom: 1rem; border-bottom: 1px solid var(--hairline);
}
.case-col p { color: var(--ink-2); font-size: 0.97rem; }
.case-col p + p { margin-top: 0.8rem; }
.case-col p b, .case-col li b { color: var(--ink); font-weight: 600; }
.case-col ul { list-style: none; }
.case-col li {
  position: relative;
  padding: 0 0 0.85rem 1.15rem;
  color: var(--ink-2);
  font-size: 0.97rem;
}
.case-col li::before {
  content: ""; position: absolute; left: 0; top: 0.55em;
  width: 5px; height: 5px; border-radius: 50%; background: var(--accent);
}

.case-quote {
  margin-top: clamp(2.6rem, 5.5vw, 4rem);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--surface);
  padding: clamp(2rem, 4vw, 3rem) 0;
}
.case-quote blockquote {
  font-size: clamp(1.2rem, 2.4vw, 1.7rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  max-width: 30ch;
}
.case-quote figcaption { margin-top: 0.9rem; font-size: 0.84rem; color: var(--ink-3); font-weight: 500; }

.case-nav { margin-top: clamp(3rem, 6vw, 4.5rem); border-top: 1px solid var(--hairline); display: grid; grid-template-columns: 1fr 1fr; }
.case-nav a { padding: 1.6rem 0.4rem; display: flex; flex-direction: column; gap: 0.3rem; }
.case-nav .lbl { font-size: 0.8rem; font-weight: 600; color: var(--ink-3); }
.case-nav .t { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; transition: color .18s; }
.case-nav a:hover .t { color: var(--accent); }
.case-nav .next { text-align: right; align-items: flex-end; border-left: 1px solid var(--hairline); }

/* ============================================================
   About page
   ============================================================ */

.about { padding-top: clamp(3.2rem, 7vw, 5.5rem); }
.about h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 700; letter-spacing: -0.035em; max-width: 16ch; line-height: 1.05; }
.about .lede { margin-top: 1.4rem; font-size: 1.1rem; color: var(--ink-2); max-width: 56ch; }
.about-grid {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: clamp(1.8rem, 4vw, 3rem);
}
.about-col h2 {
  font-size: 0.82rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase; color: var(--ink-3);
  padding-bottom: 0.8rem; margin-bottom: 0.4rem; border-bottom: 1px solid var(--hairline);
}
.exp { padding: 1rem 0; border-bottom: 1px solid var(--hairline); }
.exp .when { font-size: 0.78rem; font-weight: 600; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.exp h3 { font-size: 1rem; font-weight: 700; margin-top: 0.15rem; }
.exp .where { font-size: 0.88rem; color: var(--ink-2); }
.exp p { font-size: 0.9rem; color: var(--ink-2); margin-top: 0.35rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html.js .reveal, html.js .chips .chip,
  html.js .metrics .metric, html.js .case-metrics .metric { opacity: 1; transform: none; }
  .frame__img img { transform: none !important; }
}

/* ============================================================
   v2.1 — subtle motion + mobile refinements
   ============================================================ */

/* header shadow after scroll */
.site-head { transition: box-shadow .3s var(--ease); }
.site-head.scrolled { box-shadow: 0 1px 14px rgba(14,14,16,.07); }

/* image settle-in: starts slightly zoomed, settles when revealed */
.frame__img img { transform: scale(1.05); }
.in-view .frame__img img { transform: scale(1); }
.work-row.in-view .work-row__media:hover .frame__img img { transform: scale(1.02); }

/* gentle stagger inside revealed blocks */
html.js .chips .chip { opacity: 0; transform: translateY(8px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
html.js .in-view .chips .chip, .in-view .chips .chip { opacity: 1; transform: none; }
.in-view .chips .chip:nth-child(1) { transition-delay: .15s; }
.in-view .chips .chip:nth-child(2) { transition-delay: .23s; }
.in-view .chips .chip:nth-child(3) { transition-delay: .31s; }

/* metric numbers get a soft rise */
html.js .metrics .metric, html.js .case-metrics .metric { opacity: 0; transform: translateY(12px); transition: opacity .55s var(--ease), transform .55s var(--ease); }
html.js .metrics.in-view .metric, html.js .case-metrics.in-view .metric { opacity: 1; transform: none; }
.metrics.in-view .metric:nth-child(2), .case-metrics.in-view .metric:nth-child(2) { transition-delay: .08s; }
.metrics.in-view .metric:nth-child(3), .case-metrics.in-view .metric:nth-child(3) { transition-delay: .16s; }
.metrics.in-view .metric:nth-child(4), .case-metrics.in-view .metric:nth-child(4) { transition-delay: .24s; }

/* anchor offset under sticky header */
[id] { scroll-margin-top: 72px; }

/* ---------- mobile ---------- */

@media (max-width: 640px) {
  .site-head__inner { height: 54px; }
  .brand span { display: none; }
  .site-nav { gap: 1.05rem; font-size: 0.86rem; }
  .site-nav .cta { padding: 0.42rem 0.85rem; }

  .hero { padding-top: 3.2rem; padding-bottom: 2.2rem; }
  .hero .sub { font-size: 1rem; }
  .btn { padding: 0.68rem 1.2rem; font-size: 0.9rem; }

  .metrics__inner { padding-top: 1.3rem; padding-bottom: 1.3rem; row-gap: 1.2rem; }
  .metric { padding: 0.1rem 1rem; }
  .metric .n { font-size: 1.45rem; }
  .metric .l { font-size: 0.75rem; }

  .work { padding-top: 3rem; }
  .work-list { gap: 3rem; }
  .work-row__links { gap: 1rem; flex-wrap: wrap; }
  .frame__url { font-size: 0.66rem; }

  .case-hero { padding-top: 2.6rem; }
  .case-hero .case-actions { gap: 0.7rem; }
  .case-metrics { grid-template-columns: 1fr 1fr; }
  .case-metrics .metric {
    border-right: none;
    border-bottom: 1px solid var(--hairline);
    margin-right: 0;
    padding: 1rem 0.5rem 1rem 0;
  }
  .case-metrics .metric:nth-last-child(-n+2) { border-bottom: none; }

  .case-nav a { padding: 1.2rem 0.3rem; }
  .case-nav .t { font-size: 1rem; }
  .case-nav .next { padding-left: 0.8rem; }

  .strip { margin-top: 3rem; }
  .cred { grid-template-columns: 4.6rem 1fr; font-size: 0.88rem; }
}

/* ============================================================
   v2.2 — role strip, interactive flowchart, LinkedIn
   ============================================================ */

/* "What I did" strip in case heroes */
.role-strip {
  margin-top: 1.4rem;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.role-strip .role-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 0.3rem;
}

/* ---------- pipeline flowchart: metro rail ---------- */

.flowpanel {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(14,14,16,.04), 0 12px 40px -12px rgba(14,14,16,.1);
  padding: 1.5rem 1.7rem 1.7rem;
}
.flowpanel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.1rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--hairline);
}
.flowpanel__title { font-weight: 700; font-size: 1rem; letter-spacing: -0.015em; }
.flowpanel__meta { font-size: 0.75rem; color: var(--ink-3); font-weight: 500; margin-top: 0.1rem; }
.flowpanel__hint {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--hairline-2);
  border-radius: 99px;
  padding: 0.45rem 0.95rem;
  transition: border-color .2s, transform .2s var(--ease), box-shadow .2s;
}
.flowpanel__hint svg { width: 13px; height: 13px; stroke: currentColor; }
.flowpanel__hint:hover { border-color: var(--ink); transform: translateY(-1px); box-shadow: 0 6px 16px -8px rgba(14,14,16,.2); }

/* rail + stages */
.fp-stage {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  column-gap: 1.1rem;
  padding-bottom: 1.5rem;
}
.fp-stage:last-of-type { padding-bottom: 0.2rem; }
.fp-stage::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 30px;
  bottom: -2px;
  width: 2px;
  background: var(--hairline-2);
}
.fp-stage:last-of-type::before { display: none; }

.fp-marker {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--ink);
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-variant-numeric: tabular-nums;
  position: relative;
  z-index: 1;
}
.fp-stage--gate .fp-marker { background: var(--accent); border-color: var(--accent); color: #fff; }
.fp-stage--go .fp-marker { background: var(--green); border-color: var(--green); color: #fff; }

.fp-stagehead { display: flex; align-items: center; gap: 0.6rem; min-height: 30px; flex-wrap: wrap; }
.fp-stagehead .st { font-weight: 700; font-size: 0.95rem; letter-spacing: -0.01em; }
.fp-time {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--ink-2);
  background: var(--bg);
  border: 1px solid var(--hairline);
  border-radius: 99px;
  padding: 0.14rem 0.55rem;
  font-variant-numeric: tabular-nums;
}
.fp-stage--gate .fp-stagehead .st { color: var(--accent); }
.fp-stage--go .fp-stagehead .st { color: var(--green); }

.fp-cards {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 285px));
  gap: 0.6rem;
}
.fp-card {
  font-family: inherit;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  background: var(--surface);
  border: 1px solid var(--hairline-2);
  border-radius: 12px;
  padding: 0.75rem 0.85rem;
  cursor: pointer;
  transition: border-color .2s, transform .2s var(--ease), box-shadow .25s;
  position: relative;
  overflow: hidden;
}
.fp-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: transparent;
}
.fp-card--gate::before { background: var(--accent); }
.fp-card--go::before { background: var(--green); }
.fp-card:hover, .fp-card:focus-visible {
  border-color: var(--ink);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px -10px rgba(14,14,16,.18);
}
.fp-ic {
  flex: none;
  width: 30px; height: 30px;
  border-radius: 8px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-2);
}
.fp-card--gate .fp-ic { color: var(--accent); background: color-mix(in srgb, var(--accent) 7%, var(--surface)); border-color: color-mix(in srgb, var(--accent) 25%, var(--hairline)); }
.fp-card--go .fp-ic { color: var(--green); background: color-mix(in srgb, var(--green) 8%, var(--surface)); border-color: color-mix(in srgb, var(--green) 25%, var(--hairline)); }
.fp-ic svg { width: 15px; height: 15px; }
.fp-card .t { display: block; font-weight: 650; font-size: 0.86rem; line-height: 1.25; letter-spacing: -0.01em; }
.fp-card .s { display: block; font-size: 0.74rem; color: var(--ink-3); margin-top: 0.18rem; line-height: 1.4; }

.fp-loop {
  margin-top: 1.3rem;
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  border-top: 1px dashed var(--hairline-2);
  padding-top: 1rem;
  font-size: 0.78rem;
  color: var(--ink-2);
  line-height: 1.55;
}
.fp-loop svg { flex: none; width: 15px; height: 15px; color: var(--ink-3); margin-top: 0.1rem; }
.fp-loop b { font-weight: 650; color: var(--ink); }

@media (max-width: 640px) {
  .flowpanel { padding: 1.1rem 1rem 1.3rem; }
  .fp-stage { grid-template-columns: 24px minmax(0,1fr); column-gap: 0.8rem; }
  .fp-marker { width: 24px; height: 24px; font-size: 0.64rem; }
  .fp-stage::before { left: 11px; top: 26px; }
  .fp-cards { grid-template-columns: 1fr; }
}

/* ---------- flow modal ---------- */

.flow-modal {
  position: fixed;
  inset: 0;
  z-index: 300;
  display: none;
  overflow-y: auto;
  background: color-mix(in srgb, var(--ink) 34%, transparent);
  backdrop-filter: blur(7px);
  -webkit-backdrop-filter: blur(7px);
  padding: clamp(1rem, 4vw, 3rem);
}
.flow-modal.open { display: block; }
.flow-modal__panel {
  max-width: 860px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: 0 30px 90px -20px rgba(14,14,16,.35);
  padding: clamp(1.5rem, 3.4vw, 2.6rem);
  animation: modal-in .35s var(--ease);
}
@keyframes modal-in { from { opacity: 0; transform: translateY(16px); } }
.flow-modal__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.2rem;
  margin-bottom: 1.6rem;
  border-bottom: 1px solid var(--hairline);
}
.flow-modal__title { font-weight: 700; font-size: 1.2rem; letter-spacing: -0.02em; }
.flow-modal__close {
  border: 1px solid var(--hairline-2);
  background: var(--surface);
  border-radius: 99px;
  width: 36px; height: 36px;
  font-size: 1rem;
  line-height: 1;
  color: var(--ink-2);
  transition: border-color .2s, color .2s, transform .2s var(--ease);
  flex: none;
}
.flow-modal__close:hover { border-color: var(--ink); color: var(--ink); transform: rotate(90deg); }

.flow-modal .fp-cards { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.flow-modal .fp-card { cursor: default; flex-direction: column; }
.flow-modal .fp-card:hover { transform: none; border-color: var(--hairline-2); box-shadow: none; }
.flow-modal .fp-card--gate:hover { border-color: color-mix(in srgb, var(--accent) 30%, var(--hairline-2)); }
.flow-modal .fp-card .d { font-size: 0.85rem; color: var(--ink-2); margin-top: 0.55rem; line-height: 1.55; }
.flow-modal .fp-card.flash { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.flow-modal .fp-cardhead { display: flex; align-items: center; gap: 0.65rem; }

body.flow-modal-open { overflow: hidden; }

/* footer LinkedIn icon link */
.foot-links .ext-ic { display: inline-flex; align-items: center; gap: 0.35rem; }
.foot-links .ext-ic svg { width: 13px; height: 13px; fill: currentColor; }

/* ============================================================
   v2.3 — hero portrait + research section
   ============================================================ */

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(240px, 26vw, 330px);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
}
.portrait {
  border-radius: 18px;
  border: 1px solid var(--hairline);
  box-shadow: 0 1px 2px rgba(14,14,16,.04), 0 18px 50px -16px rgba(14,14,16,.16);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: #f2f2f4;
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 820px) {
  .hero__inner { grid-template-columns: 1fr; gap: 2rem; }
  .portrait { max-width: 270px; }
}

.photo-card {
  border-radius: var(--radius);
  border: 1px solid var(--hairline);
  box-shadow: 0 1px 2px rgba(14,14,16,.04), 0 12px 40px -12px rgba(14,14,16,.1);
  overflow: hidden;
  aspect-ratio: 16 / 11;
  background: #f2f2f4;
}
.photo-card img { width: 100%; height: 100%; object-fit: cover; }

.research { padding-top: clamp(4rem, 8vw, 6.5rem); }

/* ============================================================
   v2.4 — hero balance + layered portrait + research list
   ============================================================ */

.hero h1 { text-wrap: balance; }

.portrait-wrap { position: relative; margin-right: 14px; }
.portrait-wrap::before {
  content: "";
  position: absolute;
  top: 16px; right: -14px; bottom: -14px; left: 16px;
  border-radius: 20px;
  border: 1px solid var(--hairline-2);
  background: var(--surface);
}
.portrait-wrap .portrait { position: relative; }
.portrait-wrap .caption {
  position: relative;
  margin-top: 1.4rem;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-3);
}
@media (max-width: 820px) {
  .portrait-wrap { max-width: 280px; margin-right: 10px; }
  .portrait-wrap::before { top: 12px; right: -10px; bottom: -10px; left: 12px; }
}

.research-note {
  margin-top: clamp(2rem, 4vw, 2.8rem);
  border: 1px dashed var(--hairline-2);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1rem 1.3rem;
  font-size: 0.9rem;
  color: var(--ink-2);
  line-height: 1.6;
}
.research-note b { color: var(--ink); font-weight: 650; }

/* ============================================================
   v2.5 — touch target sizing (visual design unchanged)
   ============================================================ */

@media (pointer: coarse) {
  .site-nav a:not(.cta) { padding: 0.7rem 0.2rem; margin: -0.2rem 0; }
  .site-nav .cta { padding: 0.62rem 1.1rem; }
  .foot-links a { padding: 0.65rem 0.15rem; }
  .link-arrow, .link-ext { padding: 0.55rem 0; }
  .crumbs a { padding: 0.55rem 0.2rem; margin: -0.35rem 0; }
  .flowpanel__hint { padding: 0.62rem 1.05rem; }
  .brand { padding: 0.6rem 0; }
  .about .exp a, .site-foot .who { padding: 0.3rem 0; }
}