:root {
  --fog: #E7ECEE;
  --ink: #0E1A22;
  --steel: #5A707C;
  --concrete: #B8C0C2;
  --amber: #E3A13A;
  --serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --num: "Big Shoulders Display", "Arial Narrow", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --pad: clamp(20px, 5vw, 72px);
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--fog);
  color: var(--ink);
  font: 400 16px/1.8 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--fog); padding: 8px 14px; z-index: 20; }
.skip:focus { left: 8px; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px var(--pad);
  background: color-mix(in srgb, var(--fog) 88%, transparent);
  backdrop-filter: blur(8px);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 900 19px/1 var(--serif); letter-spacing: .12em; }
.brand svg { width: 34px; fill: none; stroke: var(--ink); stroke-width: 2; }
.nav nav { display: flex; gap: clamp(14px, 3vw, 40px); align-items: center; font-size: 15px; }
.nav nav a { text-decoration: none; }
.nav nav a:hover { color: var(--steel); }
.nav .nav-cta { border: 1.5px solid var(--ink); padding: 6px 16px; }
.nav .nav-cta:hover { background: var(--ink); color: var(--fog); }

/* hero */
.hero { position: relative; min-height: calc(100svh - 70px); display: flex; flex-direction: column; justify-content: space-between; overflow: hidden; }
.hero-copy { padding: clamp(32px, 7vh, 90px) var(--pad) 0; position: relative; z-index: 1; }
.tag { font: 500 12px/1 var(--mono); letter-spacing: .14em; color: var(--steel); margin-bottom: 28px; }
h1 {
  font: 900 clamp(48px, 9vw, 148px)/1.08 var(--serif);
  letter-spacing: -.02em;
}
.lede { max-width: 30em; margin-top: 28px; font-size: clamp(16px, 1.4vw, 19px); color: #2c3b44; }

.bridge { margin-top: 2vw; }
.bridge svg { display: block; width: 100%; height: auto; }
.bridge svg path { fill: none; stroke: var(--ink); vector-effect: non-scaling-stroke; }
.bridge .water path { stroke: var(--concrete); stroke-width: 1; }
.bridge .tower path { stroke-width: 2; }
.bridge .deck { stroke-width: 3; }
.bridge svg .cable { stroke-width: 1.6; vector-effect: none; }
.bridge .hangers path { stroke: var(--steel); stroke-width: .8; }
.bridge .dim path { stroke: var(--amber); stroke-width: 1.2; }
.bridge .dim rect { fill: var(--fog); }
.bridge .dim text { font: 500 15px var(--mono); fill: #a76a10; text-anchor: middle; }
.bridge .dim text.v { text-anchor: start; writing-mode: vertical-rl; letter-spacing: .1em; }
.bridge figcaption { font: 400 11px var(--mono); letter-spacing: .1em; color: var(--steel); padding: 12px var(--pad) 20px; text-align: right; }

/* load sequence */
.js .cable { stroke-dasharray: 1; stroke-dashoffset: 1; animation: draw 1.8s cubic-bezier(.6,0,.2,1) .3s forwards; }
.js .hangers path { transform-box: fill-box; transform-origin: bottom; transform: scaleY(0); animation: rise .5s ease-out forwards; }
.js .dim { opacity: 0; animation: fade .8s ease 2.6s forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes rise { to { transform: scaleY(1); } }
@keyframes fade { to { opacity: 1; } }

/* sections */
section:not(.hero) { padding: clamp(80px, 12vw, 160px) var(--pad); }
h2 { font: 900 clamp(34px, 4.6vw, 64px)/1.15 var(--serif); letter-spacing: -.01em; }

/* projects */
.projects { background: var(--ink); color: var(--fog); }
.projects .head { display: flex; justify-content: space-between; align-items: end; gap: 24px; flex-wrap: wrap; margin-bottom: 64px; }
.projects .head p { color: var(--concrete); max-width: 22em; }
.span-list { list-style: none; padding: 0; }
.span-list li { padding: 28px 0; border-top: 1px solid #22323c; }
.span-list li:last-child { border-bottom: 1px solid #22323c; }
.row { display: grid; grid-template-columns: 1fr auto; gap: 8px 24px; align-items: baseline; }
.row h3 { font: 600 clamp(20px, 2vw, 26px)/1.3 var(--serif); }
.row .meta { grid-column: 1; font: 400 12px var(--mono); letter-spacing: .06em; color: var(--concrete); }
.row .len { grid-row: 1 / 3; grid-column: 2; font: 800 clamp(40px, 5vw, 72px)/1 var(--num); color: var(--fog); }
.row .len small { font: 500 14px var(--mono); color: var(--concrete); margin-left: 4px; }
.dimline { position: relative; height: 14px; margin-top: 18px; width: var(--w); transform-origin: left; transform: scaleX(0); transition: transform 1.1s cubic-bezier(.3,0,.1,1); }
.dimline::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1.5px; background: var(--amber); }
.dimline::after { content: ""; position: absolute; inset: 0; border-left: 1.5px solid var(--amber); border-right: 1.5px solid var(--amber); }
.in .dimline { transform: scaleX(1); }
.span-list li:hover .len { color: var(--amber); }

/* services */
.services { display: grid; grid-template-columns: minmax(260px, 1fr) 2fr; gap: 48px clamp(40px, 6vw, 120px); }
.svc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 56px 48px; }
.svc-grid h3 { font: 600 22px/1.4 var(--serif); padding-top: 18px; border-top: 2px solid var(--ink); margin-bottom: 12px; }
.svc-grid p { color: #33434c; }

/* about */
.about { border-top: 1px solid var(--concrete); }
blockquote p { font: 600 clamp(26px, 3.6vw, 52px)/1.45 var(--serif); max-width: 22em; text-wrap: balance; }
blockquote cite { display: block; margin-top: 28px; font: normal 400 14px var(--sans); color: var(--steel); }
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; margin-top: 88px; }
.facts dt { font: 500 12px var(--mono); letter-spacing: .14em; color: var(--steel); margin-bottom: 8px; }
.facts dd { font-size: 17px; }

/* contact */
.contact { background: var(--ink); color: var(--fog); }
.contact h2 { font-size: clamp(44px, 7vw, 112px); }
.contact > p { margin-top: 20px; color: var(--concrete); font-size: 18px; }
.contact-rows { margin-top: 64px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #22323c; }
.contact-rows > * { padding: 24px 24px 0 0; text-decoration: none; font-size: 18px; display: block; }
.contact-rows span { display: block; font: 500 12px var(--mono); letter-spacing: .14em; color: var(--amber); margin-bottom: 6px; }
.contact-rows a:hover { text-decoration: underline; text-underline-offset: 6px; }

.foot { display: flex; justify-content: space-between; padding: 24px var(--pad); background: var(--ink); color: var(--steel); font: 400 12px var(--mono); border-top: 1px solid #22323c; }

/* responsive */
@media (max-width: 860px) {
  .services { grid-template-columns: 1fr; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .contact-rows { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav nav a:not(.nav-cta) { display: none; }
  .svc-grid { grid-template-columns: 1fr; gap: 40px; }
  .bridge { margin-top: 24px; }
  .bridge .dim text { font-size: 30px; }
  .foot { flex-direction: column; gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .cable, .js .hangers path, .js .dim { animation: none; stroke-dashoffset: 0; transform: none; opacity: 1; }
  .dimline { transition: none; transform: none; }
}