/* ==========================================================================
   Datum — urban research lab template · archesign.studio
   1. Tokens  2. Base  3. Header  4. Components  5. Pages  6. Footer  7. Responsive
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------- */
:root {
  --paper: #fbfbf8;
  --panel: #ffffff;
  --ink: #0f172a;
  --slate: #475569;
  --mute: #94a3b8;
  --rule: #e2e5ea;
  --blue: #2b59c3;
  --blue-soft: #e6edfa;
  --orange: #ff7a00;
  --teal: #0fa3a3;

  --font-sans: "Fira Sans", "Helvetica Neue", Arial, sans-serif;
  --font-code: "Fira Code", ui-monospace, Menlo, Consolas, monospace;

  --gutter: clamp(16px, 3vw, 44px);
  --max: 1320px;
  --space: clamp(80px, 10vw, 140px);
  --r: 10px;
}

/* 2. Base ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.6 var(--font-sans); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
p { margin: 0 0 1em; }
h1, h2, h3 { margin: 0; font-weight: 500; line-height: 1.1; letter-spacing: -.02em; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
::selection { background: var(--blue-soft); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: var(--space) 0; }
.code { font-family: var(--font-code); font-size: 13px; }
.dim { color: var(--mute); }
.tag { display: inline-block; font: 500 12px var(--font-code); padding: 3px 8px; border-radius: 4px; background: var(--blue-soft); color: var(--blue); }
.tag--o { background: #fff1e3; color: #c25d00; }
.tag--t { background: #e2f6f6; color: #0b7d7d; }
.label { font: 500 12px var(--font-code); color: var(--slate); margin: 0 0 12px; }
.label::before { content: "// "; color: var(--mute); }

/* 3. Header ---------------------------------------------------------------- */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(251, 251, 248, .96); border-bottom: 1px solid var(--rule); }
.header-row { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font: 500 20px var(--font-code); letter-spacing: -.03em; margin-right: auto; }
.logo b { color: var(--blue); font-weight: 500; }
.glyph { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; width: 18px; height: 18px; }
.glyph i { background: var(--ink); }
.glyph i:nth-child(2) { background: var(--blue); }
.glyph i:nth-child(3) { background: var(--orange); }
.glyph i:nth-child(4) { background: var(--teal); }
.site-nav { display: flex; gap: 4px; }
.site-nav a { font: 400 14px var(--font-code); padding: 7px 12px; border-radius: 6px; color: var(--slate); }
.site-nav a:hover { background: var(--blue-soft); color: var(--ink); }
.site-nav a[aria-current="page"] { background: var(--ink); color: #fff; }
.ver { color: var(--mute); border: 1px solid var(--rule); border-radius: 99px; padding: 4px 10px; }
.menu-btn { display: none; }

/* 4. Components ------------------------------------------------------------ */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 18px; border-radius: 8px; border: 1px solid var(--ink); background: var(--ink); color: #fff; font: 500 15px var(--font-sans); cursor: pointer; transition: background .2s, border-color .2s; }
.btn:hover { background: var(--blue); border-color: var(--blue); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--blue-soft); color: var(--ink); border-color: var(--blue); }
.panel { background: var(--panel); border: 1px solid var(--rule); border-radius: var(--r); }
.js .reveal { opacity: 0; transform: translateY(10px); transition: opacity .5s ease, transform .5s ease; }
.js .reveal.is-in { opacity: 1; transform: none; }

/* 5. Pages ----------------------------------------------------------------- */
/* hero */
.hero { padding: clamp(40px, 6vw, 80px) 0 0; }
.hero-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(26px, 4vw, 60px); align-items: start; }
.hero h1 { font-size: clamp(44px, 5.6vw, 84px); font-weight: 300; letter-spacing: -.04em; }
.hero h1 b { font-weight: 500; color: var(--blue); }
.hero .lead { font-size: 19px; color: var(--slate); max-width: 44ch; margin: 22px 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.dash { padding: 14px; display: grid; gap: 12px; }
.dash-head { display: flex; justify-content: space-between; align-items: center; padding: 2px 4px; }
.kpis { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.kpi { padding: 14px; border: 1px solid var(--rule); border-radius: 8px; display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; align-items: end; }
.kpi .k { grid-column: 1 / -1; font: 400 12px var(--font-code); color: var(--slate); }
.kpi b { font-size: 30px; font-weight: 500; letter-spacing: -.03em; }
.kpi .d { font: 500 12px var(--font-code); color: #0b7d7d; }
.kpi .d.neg { color: #c25d00; }
.kpi svg { grid-column: 1 / -1; width: 100%; height: 34px; }
.dash img { border-radius: 8px; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border: 1px solid var(--rule); }

/* findings */
.sec-head { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 30px; }
.sec-head h2 { font-size: clamp(32px, 3.6vw, 52px); font-weight: 400; }
.findings { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.finding { display: flex; flex-direction: column; transition: border-color .2s, box-shadow .2s; }
.finding:hover { border-color: var(--blue); box-shadow: 0 10px 30px -18px rgba(43, 89, 195, .5); }
.finding img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; border-radius: var(--r) var(--r) 0 0; border-bottom: 1px solid var(--rule); }
.finding .body { padding: 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.finding h3 { font-size: 21px; }
.finding p { margin: 0; color: var(--slate); font-size: 15px; }
.finding .meta { margin-top: auto; padding-top: 10px; display: flex; justify-content: space-between; gap: 8px; font: 400 12px var(--font-code); color: var(--mute); }
.big-stat { font-size: 40px; font-weight: 300; letter-spacing: -.04em; color: var(--blue); line-height: 1; }

/* css chart */
.chart-wrap { display: grid; grid-template-columns: 1fr 1.6fr; gap: clamp(26px, 5vw, 70px); align-items: center; }
.chart-wrap h2 { font-size: clamp(30px, 3.4vw, 48px); font-weight: 400; margin-bottom: 14px; }
.chart { padding: 20px; }
.chart .toggle { display: inline-flex; border: 1px solid var(--rule); border-radius: 8px; overflow: hidden; margin-bottom: 18px; }
.chart .toggle label { position: relative; }
.chart .toggle input { position: absolute; opacity: 0; }
.chart .toggle span { display: block; padding: 8px 14px; font: 500 13px var(--font-code); cursor: pointer; color: var(--slate); }
.chart .toggle input:checked + span { background: var(--ink); color: #fff; }
.chart .toggle input:focus-visible + span { outline: 2px solid var(--blue); outline-offset: -2px; }
.bars { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; align-items: end; height: 240px; border-bottom: 1px solid var(--ink); background: repeating-linear-gradient(0deg, transparent 0 47px, var(--rule) 47px 48px); padding: 0 6px; }
.bars .b { position: relative; height: var(--a); background: var(--blue); border-radius: 4px 4px 0 0; transition: height .7s cubic-bezier(.2, .8, .2, 1), background .3s; }
.bars .b span { position: absolute; top: -22px; left: 50%; transform: translateX(-50%); font: 500 12px var(--font-code); white-space: nowrap; }
.bars .b span::after { content: attr(data-a); }
.chart:has(#y26:checked) .b { height: var(--b); background: var(--orange); }
.chart:has(#y26:checked) .b span::after { content: attr(data-b); }
.bar-labels { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; padding: 8px 6px 0; font: 400 12px var(--font-code); color: var(--slate); text-align: center; }
.chart .note { font: 400 12px var(--font-code); color: var(--mute); margin: 14px 0 0; }

/* page head */
.page-head { padding: clamp(50px, 7vw, 100px) 0 clamp(30px, 4vw, 50px); border-bottom: 1px solid var(--rule); margin-bottom: 40px; }
.page-head h1 { font-size: clamp(44px, 6.4vw, 96px); font-weight: 300; letter-spacing: -.045em; }
.page-head h1 b { font-weight: 500; color: var(--blue); }
.page-head p { max-width: 60ch; color: var(--slate); font-size: 18px; margin: 18px 0 0; }
.filters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 20px; }
.filters button { font: 500 13px var(--font-code); background: var(--panel); color: var(--slate); border: 1px solid var(--rule); border-radius: 6px; padding: 7px 12px; cursor: pointer; }
.filters button[aria-pressed="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.pubs { width: 100%; border-collapse: collapse; }
.pubs th { text-align: left; font: 500 12px var(--font-code); color: var(--mute); padding: 10px 14px 10px 0; border-bottom: 1px solid var(--ink); }
.pubs td { padding: 16px 14px 16px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.pubs td:first-child { font: 400 13px var(--font-code); color: var(--slate); white-space: nowrap; }
.pubs a.t { font-weight: 500; font-size: 18px; display: block; }
.pubs a.t:hover { color: var(--blue); text-decoration: underline; }
.pubs .au { font-size: 14px; color: var(--slate); }
.pubs .doi { font: 400 12px var(--font-code); color: var(--mute); white-space: nowrap; }
.pubs tr[hidden] { display: none !important; }
.table-wrap { overflow-x: auto; }

/* report */
.report { display: grid; grid-template-columns: 1fr 300px; gap: clamp(30px, 5vw, 70px); align-items: start; }
.abstract { font-size: 20px; color: var(--slate); border-left: 3px solid var(--blue); padding-left: 20px; margin-bottom: 40px; }
.keys { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 40px; }
.keys div { padding: 16px; }
.keys b { display: block; font-size: 36px; font-weight: 300; letter-spacing: -.04em; color: var(--blue); }
.keys span { font-size: 14px; color: var(--slate); }
.fig { margin: 0 0 34px; }
.fig img, .fig svg { width: 100%; border-radius: var(--r); border: 1px solid var(--rule); background: var(--panel); }
.fig figcaption { font-size: 14px; color: var(--slate); margin-top: 10px; }
.fig figcaption b { font-family: var(--font-code); font-weight: 500; color: var(--ink); }
.prose h2 { font-size: 28px; font-weight: 500; margin: 10px 0 14px; }
.prose p { color: #334155; }
.side { position: sticky; top: 90px; display: grid; gap: 14px; }
.side .panel { padding: 16px; }
.downloads { list-style: none; padding: 0; margin: 0; }
.downloads li { display: flex; justify-content: space-between; gap: 10px; padding: 9px 0; border-top: 1px solid var(--rule); font-size: 14px; }
.downloads a { color: var(--blue); font-family: var(--font-code); font-size: 13px; }
.cite { font: 400 12px/1.6 var(--font-code); background: var(--ink); color: #cbd5e1; padding: 14px; border-radius: 8px; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; }

/* lab */
.members { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.member { padding: 14px; display: grid; grid-template-columns: 72px 1fr; gap: 14px; align-items: center; }
.member img { border-radius: 50%; aspect-ratio: 1; object-fit: cover; }
.member h3 { font-size: 18px; }
.member p { margin: 2px 0 0; font-size: 14px; color: var(--slate); }
.member .code { color: var(--mute); font-size: 11px; }
.partners { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.partners div { padding: 20px; font-weight: 500; color: var(--slate); text-align: center; }

/* services */
.offers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.offer { padding: 22px; display: flex; flex-direction: column; gap: 10px; }
.offer h3 { font-size: 24px; }
.offer p { margin: 0; color: var(--slate); }
.offer ul { list-style: none; padding: 0; margin: 6px 0 0; font: 400 13px var(--font-code); color: var(--slate); }
.offer li { padding: 6px 0; border-top: 1px dashed var(--rule); }
.offer li::before { content: "→ "; color: var(--blue); }
.pipeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: s; }
.pipeline div { counter-increment: s; padding: 18px 18px 0 0; border-top: 2px solid var(--ink); }
.pipeline div::before { content: "0" counter(s); font: 500 12px var(--font-code); color: var(--blue); display: block; margin-bottom: 8px; }
.pipeline b { display: block; font-size: 19px; font-weight: 500; margin-bottom: 4px; }
.pipeline span { font-size: 15px; color: var(--slate); }
.faq { max-width: 860px; }
.faq details { border-bottom: 1px solid var(--rule); padding: 16px 0; }
.faq summary { display: block; position: relative; padding-right: 40px; cursor: pointer; list-style: none; font-weight: 500; font-size: 18px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "[+]"; position: absolute; right: 0; top: 2px; font: 400 13px var(--font-code); color: var(--blue); }
.faq details[open] summary::after { content: "[−]"; }
.faq details p { margin: 10px 0 0; color: var(--slate); }

/* contact */
.contact { display: grid; grid-template-columns: 1.4fr 1fr; gap: clamp(24px, 5vw, 70px); align-items: start; }
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: clamp(16px, 3vw, 28px); }
.form > *, .field { min-width: 0; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field--full, .actions, .form-note { grid-column: 1 / -1; }
.field label { font: 500 12px var(--font-code); color: var(--slate); }
.field input, .field select, .field textarea { font: 400 16px var(--font-sans); color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 8px; padding: 11px 12px; min-width: 0; max-width: 100%; }
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-soft); }
.form-note { margin: 0; padding: 12px 14px; border-radius: 8px; background: #e2f6f6; color: #0b5f5f; font: 400 13px var(--font-code); }
.info { padding: 20px; }
.info dl { margin: 0; }
.info div { display: grid; grid-template-columns: 90px 1fr; gap: 10px; padding: 10px 0; border-top: 1px solid var(--rule); font-size: 15px; }
.info dt { font: 400 12px var(--font-code); color: var(--mute); padding-top: 3px; }
.info dd { margin: 0; }

/* 6. Footer ---------------------------------------------------------------- */
.site-footer { margin-top: var(--space); background: var(--ink); color: #cbd5e1; padding: clamp(56px, 7vw, 100px) 0 24px; }
.f-top { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 40px; align-items: end; padding-bottom: 40px; border-bottom: 1px solid #263046; }
.f-top .code { grid-column: 1 / -1; margin: 0; color: #7dd3fc; }
.f-top h2 { color: #fff; font-size: clamp(30px, 3.6vw, 52px); font-weight: 300; }
.sub { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.sub input { font: 400 16px var(--font-sans); background: #18223a; border: 1px solid #263046; color: #fff; border-radius: 8px; padding: 12px 14px; min-width: 0; }
.sub input:focus { outline: none; border-color: #7dd3fc; }
.sub .btn { background: var(--orange); border-color: var(--orange); color: var(--ink); }
.sub .form-note { grid-column: 1 / -1; }
.f-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--gutter); padding: 36px 0 24px; font-size: 15px; }
.f-grid .code { margin-bottom: 8px; }
.f-logo { font: 500 20px var(--font-code); color: #fff; margin: 0 0 8px; }
.f-logo b { color: #7dd3fc; font-weight: 500; }
.f-grid a:hover { color: #fff; text-decoration: underline; }
.f-base { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin: 0; padding-top: 16px; border-top: 1px solid #263046; color: #64748b; }

/* 7. Responsive ------------------------------------------------------------ */
@media (max-width: 1100px) {
  .findings, .offers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .members { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .partners { grid-template-columns: repeat(2, 1fr); }
  .ver { display: none; }
}
@media (max-width: 860px) {
  .menu-btn { display: inline-block; margin-left: auto; position: relative; z-index: 60; font: 500 14px var(--font-code); background: var(--ink); color: #fff; border: 0; border-radius: 6px; padding: 8px 14px; cursor: pointer; }
  .site-nav { position: fixed; inset: 0; z-index: 55; flex-direction: column; justify-content: center; gap: 6px; padding: 0 var(--gutter); background: var(--paper); background-image: linear-gradient(var(--rule) 1px, transparent 1px), linear-gradient(90deg, var(--rule) 1px, transparent 1px); background-size: 32px 32px; opacity: 0; visibility: hidden; transition: opacity .2s, visibility .2s; }
  .site-nav a { font: 400 36px var(--font-code); letter-spacing: -.04em; color: var(--ink); background: var(--paper); padding: 6px 10px; width: fit-content; }
  .menu-open .site-nav { opacity: 1; visibility: visible; }
  .menu-open { overflow: hidden; }
  .hero-grid, .chart-wrap, .report, .contact, .form, .f-top { grid-template-columns: 1fr; }
  .side { position: static; }
  .pipeline { grid-template-columns: 1fr 1fr; row-gap: 20px; }
  .f-grid { grid-template-columns: 1fr 1fr; }
  .f-grid > :first-child { grid-column: 1 / -1; }
  .sec-head { flex-direction: column; align-items: flex-start; }
  .pubs .doi, .pubs th:last-child { display: none; }
}
@media (max-width: 560px) {
  .findings, .offers, .members { grid-template-columns: 1fr; }
  .keys { grid-template-columns: 1fr; }
  .bars, .bar-labels { gap: 6px; }
  .bars { height: 200px; }
  .bar-labels { font-size: 10px; }
  .pubs td:first-child { display: none; }
  .pubs th:first-child { display: none; }
  .sub { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}