/* BEconomics: site styles */
:root{
  --petrol:#12303a;      /* brand ground: header, hero, footer */
  --petrol-2:#0d252d;
  --teal:#07b7aa;        /* brand accent from the logo */
  --teal-ink:#05776f;    /* teal dark enough for text on paper */
  --paper:#f3f6f4;
  --surface:#ffffff;
  --ink:#16262b;
  --muted:#53666a;
  --rule:#d3dcd9;
  --on-dark:#e7efec;
  --on-dark-muted:#a9bcb8;
  --serif:"Frank Ruhl Libre",Georgia,serif;
  --sans:"Assistant","Segoe UI",Arial,sans-serif;
  --wrap:1160px;
  --gutter:clamp(16px,4vw,40px);
  --radius:6px;
}
:root:not([data-theme="light"]){color-scheme:light}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0f1f24; --surface:#152a31; --ink:#e4ece9; --muted:#9db1ad; --rule:#28434a; --teal-ink:#3fd2c6;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#0f1f24; --surface:#152a31; --ink:#e4ece9; --muted:#9db1ad; --rule:#28434a; --teal-ink:#3fd2c6;
  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;overflow-x:clip}
body{margin:0;background:var(--paper);color:var(--ink);font:400 18px/1.7 var(--sans);text-rendering:optimizeLegibility}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal-ink);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--teal);outline-offset:3px;border-radius:2px}
.skip{position:absolute;top:8px;inset-inline-start:8px;background:var(--surface);color:var(--ink);padding:8px 14px;z-index:20;clip-path:inset(50%);width:1px;height:1px;overflow:hidden;white-space:nowrap}
.skip:focus{clip-path:none;width:auto;height:auto;overflow:visible}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}

h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.2;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(2.2rem,5.2vw,3.7rem);letter-spacing:-.005em}
h2{font-size:clamp(1.6rem,3.2vw,2.35rem)}
h3{font-size:1.3rem;font-weight:700}
p{margin:0 0 1em}
.lead{font-size:1.22rem;color:var(--muted);max-width:40em}
.prose{max-width:42em}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.4em}
.prose ul,.prose ol{padding-inline-start:1.2em}
.prose li{margin-bottom:.4em}

/* header */
.site-header{background:var(--petrol);color:var(--on-dark);position:sticky;top:0;z-index:10}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:72px}
.brand{display:block;flex:0 0 auto}
.brand img{height:44px;width:auto}
.nav{display:flex;align-items:center;gap:4px}
.nav a{color:var(--on-dark);text-decoration:none;padding:8px 12px;border-radius:var(--radius);font-weight:600;font-size:1rem}
.nav a:hover,.nav a[aria-current="page"]{background:rgba(255,255,255,.08)}
.nav a[aria-current="page"]{box-shadow:inset 0 -2px 0 var(--teal)}
.nav .nav-cta{background:var(--teal);color:#05221f;margin-inline-start:8px}
.nav .nav-cta:hover{background:#2cc8bc}
.menu-btn{display:none;background:none;border:1px solid rgba(255,255,255,.3);color:var(--on-dark);font:600 1rem var(--sans);padding:8px 14px;border-radius:var(--radius);cursor:pointer}
@media (max-width:980px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;inset-inline:0;top:72px;background:var(--petrol-2);flex-direction:column;align-items:stretch;padding:12px var(--gutter) 20px;gap:2px}
  .nav.open{display:flex}
  .nav a{padding:12px}
  .nav .nav-cta{margin:8px 0 0;text-align:center}
}

/* hero */
.hero{background:var(--petrol);color:var(--on-dark);padding:clamp(48px,8vw,96px) 0 clamp(56px,8vw,104px);position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(32px,6vw,80px);align-items:center}
.hero h1{color:#fff;max-width:13em}
.hero .lead{color:var(--on-dark-muted)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-block;font:700 1.02rem var(--sans);padding:13px 22px;border-radius:var(--radius);text-decoration:none;border:2px solid transparent}
.btn-primary{background:var(--teal);color:#05221f}
.btn-primary:hover{background:#2cc8bc}
.btn-ghost{border-color:rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{border-color:#fff}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}}

/* the experiment readout: the one signature element */
.readout{background:var(--petrol-2);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:26px 26px 22px}
.readout-title{font:700 1.05rem var(--sans);color:#fff;margin:0 0 4px}
.readout-sub{font-size:.95rem;color:var(--on-dark-muted);margin:0 0 22px}
.bar{margin:0 0 18px}
.bar-label{display:flex;justify-content:space-between;gap:12px;font-size:.95rem;color:var(--on-dark);margin-bottom:6px}
.bar-label b{font-variant-numeric:tabular-nums;color:#fff}
.bar-track{height:14px;background:rgba(255,255,255,.07);border-radius:3px;overflow:hidden}
.bar-fill{height:100%;width:var(--w);background:var(--on-dark-muted);border-radius:3px;transform-origin:right center}
.bar-fill.is-treat{background:var(--teal)}
.readout-note{font-size:.88rem;color:var(--on-dark-muted);margin:16px 0 0;border-top:1px solid rgba(255,255,255,.1);padding-top:12px}
.readout-note a{color:var(--teal)}
@media (prefers-reduced-motion:no-preference){
  .js .bar-fill{animation:grow 1.1s cubic-bezier(.2,.7,.2,1) both}
  .js .bar:nth-child(2) .bar-fill{animation-delay:.25s}
  .js .bar:nth-child(3) .bar-fill{animation-delay:.5s}
}
@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}

/* sections */
.section{padding:clamp(56px,8vw,96px) 0}
.section-tight{padding:clamp(40px,6vw,64px) 0}
.section-alt{background:var(--surface);border-block:1px solid var(--rule)}
.section-head{max-width:44em;margin-bottom:36px}
.section-head p{color:var(--muted)}

/* pillars */
.pillars{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--rule);border-radius:10px;overflow:hidden;background:var(--surface)}
.pillar{padding:clamp(24px,4vw,44px)}
.pillar+.pillar{border-inline-start:1px solid var(--rule)}
.pillar h3{font-size:1.6rem;font-weight:500;margin-bottom:.4em}
.pillar>p{color:var(--muted)}
.link-list{list-style:none;margin:20px 0 0;padding:0;border-top:1px solid var(--rule)}
.link-list li{border-bottom:1px solid var(--rule)}
.link-list a{display:flex;justify-content:space-between;gap:16px;padding:14px 0;color:var(--ink);text-decoration:none;font-weight:600}
.link-list a span{font-weight:400;color:var(--muted);font-size:.95rem;text-align:start}
.link-list a:hover{color:var(--teal-ink)}
@media (max-width:820px){.pillars{grid-template-columns:1fr}.pillar+.pillar{border-inline-start:0;border-top:1px solid var(--rule)}.link-list a{flex-direction:column;gap:2px}}

/* process: a real sequence, so it is numbered */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,3vw,40px);counter-reset:step}
.steps li{counter-increment:step;border-top:3px solid var(--teal);padding-top:18px}
.steps li::before{content:counter(step);font:500 2.4rem/1 var(--serif);color:var(--teal-ink);display:block;margin-bottom:10px}
.steps h3{margin-bottom:.35em}
.steps p{color:var(--muted);margin:0}
@media (max-width:820px){.steps{grid-template-columns:1fr}}

/* results ledger */
.ledger{border-top:1px solid var(--rule)}
.ledger-row{display:grid;grid-template-columns:200px 1fr 220px;gap:24px;align-items:baseline;padding:22px 0;border-bottom:1px solid var(--rule);color:var(--ink);text-decoration:none}
.ledger-row:hover .ledger-title{color:var(--teal-ink);text-decoration:underline;text-underline-offset:3px}
.ledger-client{font-weight:700}
.ledger-kind{display:block;font-size:.9rem;color:var(--muted);font-weight:400}
.ledger-title{font-family:var(--serif);font-size:1.22rem;line-height:1.35}
.ledger-result{font-weight:700;color:var(--teal-ink);text-align:end}
.ledger-result small{display:block;font-weight:400;color:var(--muted);font-size:.88rem}
@media (max-width:820px){.ledger-row{grid-template-columns:1fr;gap:4px}.ledger-result{text-align:start}}

/* logos */
.logos{display:grid;grid-template-columns:repeat(8,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule);border-radius:10px;overflow:hidden}
.logos li{list-style:none;background:#fff;display:flex;align-items:center;justify-content:center;padding:22px 18px;min-height:110px}
.logos img{max-height:58px;width:auto;object-fit:contain;filter:grayscale(1);opacity:.78;transition:filter .2s,opacity .2s}
.logos li:hover img{filter:none;opacity:1}
@media (max-width:1100px){.logos{grid-template-columns:repeat(4,1fr)}}
@media (max-width:520px){.logos{grid-template-columns:repeat(2,1fr)}.logos li{min-height:90px;padding:16px 12px}}
.logos-note{font-size:.9rem;color:var(--muted);margin-top:12px}

/* about teaser / person */
.person{display:grid;grid-template-columns:300px 1fr;gap:clamp(28px,5vw,64px);align-items:start}
.person img{border-radius:8px;aspect-ratio:6/7;object-fit:cover;width:100%}
.facts{list-style:none;padding:0;margin:20px 0;display:grid;gap:10px}
.facts li{padding-inline-start:18px;position:relative}
.facts li::before{content:"";position:absolute;inset-inline-start:0;top:.7em;width:7px;height:7px;background:var(--teal);border-radius:50%}
@media (max-width:760px){.person{grid-template-columns:1fr}.person img{max-width:320px}}

.experts{display:grid;grid-template-columns:repeat(2,1fr);gap:28px 40px}
.expert{display:grid;grid-template-columns:96px 1fr;gap:18px;align-items:start}
.expert img{border-radius:50%;width:96px;height:96px;object-fit:cover}
.expert h3{margin:0 0 2px;font-size:1.2rem}
.expert .role{color:var(--teal-ink);font-weight:600;font-size:.95rem;margin:0 0 6px}
.expert p{font-size:.98rem;color:var(--muted);margin:0}
@media (max-width:760px){.experts{grid-template-columns:1fr}}

/* page header for inner pages */
.page-head{background:var(--petrol);color:var(--on-dark);padding:clamp(40px,6vw,72px) 0 clamp(36px,5vw,56px)}
.page-head h1{color:#fff;font-size:clamp(2rem,4.4vw,3.1rem);max-width:18em}
.page-head .lead{color:var(--on-dark-muted);margin:0}
.crumbs{font-size:.92rem;margin-bottom:14px;color:var(--on-dark-muted)}
.crumbs a{color:var(--on-dark-muted)}
.crumbs a:hover{color:#fff}

/* inner layout */
.cols{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:clamp(32px,5vw,72px);align-items:start}
.aside{position:sticky;top:96px;background:var(--surface);border:1px solid var(--rule);border-radius:10px;padding:22px}
.aside h2{font:700 1.05rem var(--sans);margin:0 0 10px}
.aside ul{list-style:none;padding:0;margin:0}
.aside li{border-top:1px solid var(--rule)}
.aside li a{display:block;padding:9px 0;text-decoration:none;color:var(--ink);font-size:.98rem}
.aside li a[aria-current="page"]{color:var(--teal-ink);font-weight:700}
.aside li a:hover{color:var(--teal-ink)}
@media (max-width:900px){.cols{grid-template-columns:1fr}.aside{position:static}}

/* case study */
.case-meta{display:flex;flex-wrap:wrap;gap:8px 24px;margin:18px 0 0;padding:0;list-style:none;font-size:.95rem;color:var(--on-dark-muted)}
.case-meta b{color:#fff;font-weight:600}
.case-block{padding:22px 0;border-top:1px solid var(--rule)}
.case-block:first-child{border-top:0;padding-top:0}
.case-block h2{font:700 1.08rem var(--sans);color:var(--teal-ink);margin:0 0 8px}
.case-block p:last-child{margin-bottom:0}
.result-box{background:var(--surface);border:1px solid var(--rule);border-inline-start:4px solid var(--teal);border-radius:6px;padding:18px 22px;margin-top:8px}
.result-box p{margin:0}

/* cards list (projects, articles) */
.grid-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.tile{display:flex;flex-direction:column;height:100%;background:var(--surface);border:1px solid var(--rule);border-radius:8px;padding:22px;color:var(--ink);text-decoration:none}
.tile:hover{border-color:var(--teal)}
.tile .kind{font-size:.88rem;color:var(--teal-ink);font-weight:700;margin-bottom:6px}
.tile h3{font-size:1.25rem;font-weight:500;margin:0 0 8px}
.tile p{color:var(--muted);font-size:.98rem;margin:0}
.tile .logo-slot{height:56px;margin-bottom:16px;display:flex;align-items:center}
.tile .logo-slot img{max-height:52px;width:auto;max-width:180px;object-fit:contain}
.group-title{margin:48px 0 18px}
.group-title:first-child{margin-top:0}

/* method box (event study) */
.method{background:var(--surface);border:1px solid var(--rule);border-radius:8px;padding:clamp(20px,3vw,32px);margin:24px 0}
.method dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:10px 18px}
.method dt{font-weight:700}
.method dd{margin:0;color:var(--muted)}
.formula{direction:ltr;text-align:left;font-family:var(--serif);font-size:1.12rem;background:var(--paper);border-radius:6px;padding:12px 16px;margin:12px 0;overflow-x:auto}
@media (max-width:640px){.method dl{grid-template-columns:1fr}.method dd{margin-bottom:8px}}

/* faq */
.faq details{border-bottom:1px solid var(--rule)}
.faq details:first-of-type{border-top:1px solid var(--rule)}
.faq summary{cursor:pointer;list-style:none;padding:18px 0;font:500 1.2rem/1.4 var(--serif);display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:400 1.5rem/1 var(--sans);color:var(--teal-ink);flex:0 0 auto}
.faq details[open] summary::after{content:"−"}
.faq .answer{padding:0 0 20px;color:var(--ink);max-width:42em}

/* lectures */
.talk{padding:28px 0;border-top:1px solid var(--rule)}
.talk:first-child{border-top:0;padding-top:0}
.talk dl{display:flex;flex-wrap:wrap;gap:6px 28px;margin:6px 0 12px;font-size:.95rem}
.talk dt{color:var(--muted);display:inline}
.talk dd{display:inline;margin:0 0 0 0;font-weight:600}
.talk dl div{display:flex;gap:6px}

/* references */
.refs{direction:ltr;text-align:left;padding-left:1.4em}
.refs li{margin-bottom:.7em;font-size:.98rem}

/* contact */
.contact{background:var(--petrol);color:var(--on-dark)}
.contact .wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(32px,6vw,80px)}
.contact h2{color:#fff}
.contact p{color:var(--on-dark-muted)}
.contact-lines{list-style:none;padding:0;margin:24px 0 0;display:grid;gap:12px}
.contact-lines a{color:#fff;font-weight:600}
.contact-lines span{display:block;font-size:.9rem;color:var(--on-dark-muted)}
form .field{margin-bottom:14px}
form label{display:block;font-weight:600;margin-bottom:6px;color:#fff}
form input,form textarea{width:100%;font:inherit;font-size:1rem;color:var(--ink);background:#fff;border:1px solid transparent;border-radius:var(--radius);padding:12px 14px}
form textarea{min-height:130px;resize:vertical}
form input:focus,form textarea:focus{outline:3px solid var(--teal);outline-offset:1px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-status{margin-top:12px;font-weight:600;min-height:1.5em}
.form-status.ok{color:var(--teal)}
.form-status.err{color:#ffb4a8}
.hp{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);opacity:0}
@media (max-width:820px){.contact .wrap,.form-row{grid-template-columns:1fr}}

/* footer */
.site-footer{background:var(--petrol-2);color:var(--on-dark-muted);padding:48px 0 32px;font-size:.95rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.site-footer h2{font:700 1rem var(--sans);color:#fff;margin:0 0 12px}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.site-footer a{color:var(--on-dark-muted);text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.site-footer .brand img{height:38px;margin-bottom:14px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:36px;padding-top:18px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
@media (max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.footer-grid{grid-template-columns:1fr}}

.theme-toggle{background:none;border:1px solid rgba(255,255,255,.25);color:var(--on-dark-muted);border-radius:var(--radius);padding:4px 10px;font:inherit;font-size:.9rem;cursor:pointer}
@media print{.site-header,.contact,.site-footer,.aside{display:none}body{background:#fff;color:#000}}