/* Layout: a project collection. A sticky tech-stack filter under the header; one featured wide card
   (DriveAgent) and a two-column grid of project cards with the same anatomy: image, context, what was built,
   results, tech stack (filterable), skills, links. Colours from the DriveAgent map-figure legend; light only. */
:root {
  color-scheme: light;
  --bg: #F2F3F1;        /* crosswalk paper */
  --surface: #FFFFFF;
  --ink: #23272E;       /* asphalt */
  --muted: #5E6670;
  --line: #D9DCD8;
  --track: #E3E5E2;
  --road: #B8BCC2;      /* baselines */
  --walk: #7FB37E;      /* sidewalk green */
  --park: #3A72B8;      /* car-park blue: primary, links, active filter */
  --junction: #C9631C;  /* intersection orange: highlights */
  --park-soft: #E6EEF8;
  --on-park: #FFFFFF;
  --display: "Overpass", "Noto Sans SC", system-ui, "Segoe UI", sans-serif;
  --body: "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "Overpass Mono", ui-monospace, Consolas, Menlo, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16.5px/1.6 var(--body); }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); z-index: 10; background: var(--bg); }
.wrap { max-width: 1140px; margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }
a { color: var(--park); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--junction); }
:focus-visible { outline: 3px solid var(--junction); outline-offset: 2px; border-radius: 3px; }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; color: var(--ink); margin: 0; }
p { margin: 0; }

/* ---------- header */
.hero { padding-block: 32px 28px; }
.langbar { display: flex; justify-content: flex-end; gap: 6px; margin-bottom: 36px; font: 13px var(--mono); }
.langbar a, .langbar span { padding: 4px 10px; border-radius: 3px; text-decoration: none; }
.langbar a { color: var(--muted); }
.langbar a:hover { color: var(--ink); background: var(--track); }
.langbar span { background: var(--ink); color: var(--bg); }
/* kicker (what the page is) → name (largest) → degree line → one-line summary → contact */
.kicker { display: flex; align-items: center; gap: 12px; font: 600 13px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--junction); margin-bottom: 14px; }
.kicker::before { content: ""; width: 34px; height: 4px; background: var(--junction); border-radius: 1px; }
:lang(zh) .kicker { letter-spacing: .12em; }
h1 { font-size: clamp(44px, 7.4vw, 84px); line-height: 1; font-weight: 800; letter-spacing: -.03em; margin-bottom: 14px; }
:lang(zh) h1 { letter-spacing: .02em; }
h1 .alt { font-size: .42em; font-weight: 700; letter-spacing: -.01em; color: var(--muted); margin-left: .25em; white-space: nowrap; }
.role { font-size: 19px; font-weight: 700; color: var(--ink); margin-bottom: 14px; }
.nw { white-space: nowrap; }
.lede { font-size: 17.5px; color: var(--muted); max-width: 720px; margin-bottom: 18px; }
.meta { display: flex; flex-wrap: wrap; gap: 6px 22px; font: 14px var(--mono); color: var(--muted); }
.lane { height: 4px; background: repeating-linear-gradient(90deg, var(--junction) 0 30px, transparent 30px 56px); opacity: .5; }

/* ---------- filter bar */
.filters { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 5; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(6px); border-bottom: 1px solid var(--line); }
.filters .wrap { padding-block: 12px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.filters .label { font: 600 12.5px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); }
:lang(zh) .filters .label { letter-spacing: .02em; }
.chiprow { display: flex; flex-wrap: wrap; gap: 6px; min-width: 0; }
.fchip { font: 13.5px var(--body); color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; cursor: pointer; display: inline-flex; gap: 6px; align-items: center; }
.fchip .n { font: 600 11.5px var(--mono); color: var(--muted); }
.fchip:hover { border-color: var(--park); }
.fchip[aria-pressed="true"] { background: var(--park); border-color: var(--park); color: var(--on-park); }
.fchip[aria-pressed="true"] .n { color: var(--on-park); opacity: .85; }
.status { font: 13px var(--mono); color: var(--muted); margin-left: auto; }

/* ---------- cards */
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; padding-block: 28px 12px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; display: flex; flex-direction: column; min-width: 0; }
.card[hidden] { display: none !important; }
.card { scroll-margin-top: 160px; }  /* #card links land below the sticky filter bar */
.card .thumb { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; object-position: top; background: #fff; border-bottom: 1px solid var(--line); }
.card .thumb.contain { object-fit: contain; padding: 10px; }
.card .body { padding: 20px 22px 22px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.ctx { font: 600 12px var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
:lang(zh) .ctx { letter-spacing: .02em; }
.card h2 { font-size: 23px; line-height: 1.2; font-weight: 800; }
.what { color: var(--muted); }
.results { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.results li { padding-left: 18px; position: relative; }
.results li::before { content: ""; position: absolute; left: 0; top: .62em; width: 8px; height: 8px; border-radius: 2px; background: var(--junction); }
.results b { font-family: var(--mono); font-weight: 700; color: var(--park); }
.tags { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 8px 12px; align-items: baseline; margin: 4px 0 0; padding-top: 12px; border-top: 1px dashed var(--line); }
.tags dt { font: 600 11.5px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); white-space: nowrap; }
:lang(zh) .tags dt { letter-spacing: .02em; font-size: 12.5px; }
.tags dd { margin: 0; display: flex; flex-wrap: wrap; gap: 5px; }
.tech { font: 12.5px var(--mono); color: var(--ink); background: var(--track); border-radius: 3px; padding: 2px 8px; }
.tech.on { background: var(--park); color: var(--on-park); }
.skill { font: 13px var(--body); color: var(--park); background: var(--park-soft); border-radius: 3px; padding: 2px 8px; }
.links { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: auto; padding-top: 4px; }
.links a { font-size: 14.5px; text-decoration: none; border-bottom: 2px solid var(--track); padding-bottom: 1px; }
.links a::after { content: " \2192"; }
.links a:hover { border-color: var(--junction); }
.cap { font-size: 13px; color: var(--muted); padding: 8px 22px 0; }

/* featured card: one column, top to bottom (title, description, figure, chart, results, tags, links) */
.card.featured { grid-column: 1 / -1; }
.card.featured .body { padding: 26px 30px 28px; gap: 14px; }
.card.featured h2 { font-size: clamp(26px, 3vw, 32px); }
.fig { margin: 6px 0; border: 1px solid var(--line); border-radius: 6px; background: #fff; overflow: hidden; }
.fig .thumb { aspect-ratio: auto; height: auto; border-bottom: 0; object-fit: contain; }
.fig .cap { padding: 8px 14px 10px; border-top: 1px solid var(--line); }
.badge { align-self: flex-start; font: 700 11.5px var(--mono); letter-spacing: .07em; text-transform: uppercase; background: var(--junction); color: #fff; padding: 3px 8px; border-radius: 3px; }

/* mini bar chart in the featured card */
.mini { display: grid; gap: 7px; padding: 14px 16px; background: var(--bg); border-radius: 6px; }
.mini .t { font: 700 13.5px var(--display); }
.row { display: grid; grid-template-columns: 150px minmax(0, 1fr) 42px; gap: 10px; align-items: center; font-size: 13.5px; color: var(--muted); }
.track { height: 12px; background: var(--track); border-radius: 2px; overflow: hidden; }
.fill { height: 100%; width: var(--w); border-radius: 2px; }
.fill.road { background: var(--road); } .fill.walk { background: var(--walk); } .fill.park { background: var(--park); }
.val { text-align: right; font: 700 13.5px var(--mono); color: var(--ink); font-variant-numeric: tabular-nums; }
.motion .grow .fill { width: 0; transition: width 1s cubic-bezier(.2, .7, .2, 1); }
.motion .grow .row:nth-of-type(2) .fill { transition-delay: .15s; }
.motion .grow .row:nth-of-type(3) .fill { transition-delay: .3s; }
.motion .grow.in .fill { width: var(--w); }

.empty { padding: 40px 0; color: var(--muted); }
footer { padding-block: 28px 56px; font: 13px var(--mono); color: var(--muted); }
footer p { margin-top: 18px; }

@media (max-width: 900px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .card.featured .body { padding: 20px 18px 22px; }
  .status { margin-left: 0; width: 100%; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .card .body { padding: 18px 16px 20px; }
  .row { grid-template-columns: minmax(0, 1fr) 42px; }
  .row .lt { grid-column: 1 / -1; margin-bottom: -4px; }
  .tags { grid-template-columns: minmax(0, 1fr); }
  .langbar { margin-bottom: 24px; }
  /* one scrollable chip row so the sticky bar stays short on phones */
  .filters .wrap { gap: 6px 10px; padding-block: 10px; }
  .chiprow { flex-wrap: nowrap; overflow-x: auto; width: 100%; scrollbar-width: none; padding-bottom: 2px;
    mask-image: linear-gradient(90deg, #000 88%, transparent); }
  .chiprow::-webkit-scrollbar { display: none; }
  .fchip { flex: none; }
  .filters .label { display: none; }
  .card { scroll-margin-top: 96px; }
  .status { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) { .motion .grow .fill { width: var(--w); transition: none; } }