:root{
  --bg:#F7FAFD;
  --paper:#FFFFFF;
  --ink:#16262E;
  --muted:#5A6B73;
  --teal:#1D5FA6;
  --teal-dark:#143F73;
  --coral:#C8391A;
  --peach:#FFE6DA;
  --mint:#DCEBFA;
  --night:#0F2A47;
  --line:#DFE7EF;
  --radius:22px;
  --shadow:0 10px 30px rgba(22,38,46,.08);
  --font-display:"Fraunces",Georgia,"Times New Roman",serif;
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);line-height:1.65;font-size:17px;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:var(--teal);text-underline-offset:3px}
a:hover{color:var(--teal-dark)}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.15;margin:0 0 .5em;font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(2.3rem,5.2vw,3.9rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.4rem)}
h3{font-size:1.3rem}
p{margin:0 0 1em}
.wrap{width:min(1120px,92%);margin-inline:auto}
.narrow{width:min(780px,92%);margin-inline:auto}
section{padding:72px 0}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--teal);background:var(--mint);padding:6px 14px;border-radius:999px;margin-bottom:18px}
.lead{font-size:1.2rem;color:var(--muted);max-width:60ch}
.skip{position:absolute;left:-999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:100;border-radius:8px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(247,250,253,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{font-family:var(--font-display);font-weight:700;font-size:1.35rem;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:10px}
.brand span{color:var(--coral)}
.brand-dot{width:26px;height:26px}
.nav ul{display:flex;gap:6px;list-style:none;margin:0;padding:0;align-items:center}
.nav a.link{color:var(--ink);text-decoration:none;padding:8px 14px;border-radius:999px;font-size:.95rem;font-weight:500}
.nav a.link:hover,.nav a.link[aria-current="page"]{background:var(--peach)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:12px;padding:8px 12px;font:inherit;cursor:pointer}

/* buttons */
.btn{display:inline-block;font-weight:600;text-decoration:none;padding:13px 24px;border-radius:999px;border:2px solid transparent;cursor:pointer;font-family:var(--font-body);font-size:1rem;transition:transform .15s ease, box-shadow .15s ease, background .15s}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--coral);color:#fff;box-shadow:0 8px 20px rgba(200,57,26,.35)}
.btn-primary:hover{background:#A82F14;color:#fff}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-teal{background:var(--teal);color:#fff}
.btn-teal:hover{background:var(--teal-dark);color:#fff}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}

/* hero */
.hero{padding:64px 0 40px;position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1 em{font-style:italic;color:var(--teal)}
.hero-art{position:relative}
.blob{position:absolute;border-radius:50%;filter:blur(2px);z-index:-1}

/* cards */
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.card h3{margin-bottom:.4em}
.card p:last-child{margin-bottom:0}
.door{position:relative;overflow:hidden;padding:36px;text-decoration:none;color:var(--ink);display:block;transition:transform .2s}
.door:hover{transform:translateY(-4px);color:var(--ink)}
.door.public{background:linear-gradient(160deg,var(--peach),#fff 70%)}
.door.research{background:linear-gradient(160deg,var(--mint),#fff 70%)}
.door .go{font-weight:600;color:var(--teal);margin-top:14px;display:inline-block}
.icon{width:46px;height:46px;border-radius:14px;background:var(--mint);display:grid;place-items:center;font-size:1.4rem;margin-bottom:14px}
.icon.warm{background:var(--peach)}
.tag{display:inline-block;font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--mint);color:var(--teal-dark);margin-right:6px}
.tag.soon{background:#E6EDF5;color:var(--muted)}
.tag.warm{background:var(--peach);color:#9a3c20}

.band{background:var(--night);color:#EAF2FA;border-radius:34px;padding:56px;margin:0 auto}
.band h2{color:#fff}
.band p{color:#C3D6EA}
.band .eyebrow{background:rgba(255,255,255,.12);color:#BFDBF7}

/* stripe sections */
.alt{background:#EDF3F9}
.section-head{max-width:680px;margin-bottom:36px}

/* forms */
.form{display:grid;gap:14px;max-width:520px}
.form label{font-weight:600;font-size:.95rem}
.form input[type=email],.form input[type=text],.form textarea{width:100%;padding:14px 18px;border-radius:14px;border:2px solid var(--line);font:inherit;background:#fff;color:var(--ink)}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--teal)}
.checks{display:grid;gap:8px;border:none;padding:0;margin:0}
.checks legend{font-weight:600;margin-bottom:6px;padding:0}
.checks label{font-weight:400;display:flex;gap:10px;align-items:flex-start}
.checks input{margin-top:6px;accent-color:var(--coral)}
.band .form input[type=email]{border-color:transparent}
.band .checks label,.band .form label{color:#EAF2FA}
.small{font-size:.85rem;color:var(--muted)}
.band .small{color:#9DBBDD}
.hp{position:absolute;left:-9999px}

/* toggle */
.toggle{display:inline-flex;background:#fff;border:1px solid var(--line);border-radius:999px;padding:5px;box-shadow:var(--shadow);position:sticky;top:78px;z-index:20}
.toggle button{border:none;background:transparent;font:inherit;font-weight:600;padding:10px 22px;border-radius:999px;cursor:pointer;color:var(--muted)}
.toggle button[aria-pressed="true"]{background:var(--teal);color:#fff}
.topic{padding:36px 0;border-bottom:1px solid var(--line)}
.topic:last-of-type{border-bottom:none}
.technical{display:none}
body.tech .technical{display:block}
body.tech .simple{display:none}
.callout{background:var(--peach);border-radius:16px;padding:16px 20px;margin:16px 0;font-size:.97rem}
.technical .callout{background:var(--mint)}
dl{margin:0}
dt{font-weight:700;margin-top:14px}
dd{margin:2px 0 0;color:var(--muted)}

/* project */
.project{display:grid;grid-template-columns:.9fr 1.1fr;gap:34px;align-items:center;margin-bottom:40px}
.project .art{background:var(--mint);border-radius:var(--radius);aspect-ratio:4/3;display:grid;place-items:center;padding:20px}
.project:nth-child(even) .art{background:var(--peach)}
.project details{margin-top:12px}
summary{cursor:pointer;font-weight:600;color:var(--teal)}

/* sample issue */
.issue{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
.issue ol{padding-left:1.2em;margin:0}
.issue li{margin-bottom:10px}

/* footer */
footer{background:var(--night);color:#C3D6EA;padding:56px 0 30px;margin-top:40px}
footer a{color:#fff;text-decoration:none}
footer a:hover{text-decoration:underline;color:#fff}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
footer h4{color:#fff;font-family:var(--font-body);font-size:.85rem;letter-spacing:.1em;text-transform:uppercase}
footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.copy{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:20px;font-size:.85rem;color:#9DBBDD}

/* motion */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}
@keyframes sway{0%,100%{transform:rotate(-2deg)}50%{transform:rotate(2.5deg)}}
@keyframes breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.04)}}
.sway{transform-origin:50% 95%;animation:sway 6s ease-in-out infinite}
.breathe{transform-origin:center;animation:breathe 5s ease-in-out infinite}
@media (prefers-reduced-motion:reduce){.sway,.breathe{animation:none}.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

@media (max-width:900px){
  .hero-grid,.project,.g2,.g3,.g4,.foot-grid{grid-template-columns:1fr}
  .band{padding:34px 24px;border-radius:26px}
  section{padding:52px 0}
  .menu-btn{display:block}
  .nav ul{display:none;position:absolute;top:68px;left:0;right:0;background:var(--bg);flex-direction:column;align-items:stretch;padding:14px 4%;border-bottom:1px solid var(--line)}
  .nav ul.open{display:flex}
}

.bt{font-weight:inherit}

/* Research atlas */
.atlas{display:grid;grid-template-columns:minmax(260px,380px) 1fr;gap:26px;align-items:start}
.atlas-map{padding:20px;text-align:center}
#body{width:100%;max-height:640px;margin:0 auto}
#body .figure ellipse,#body .figure rect,#body .figure path:not(.limb){fill:#EADFD2}
#body .figure .limb{fill:none;stroke:#EADFD2;stroke-width:34;stroke-linecap:round}
.zone{cursor:pointer;outline:none}
.zone *{fill:#F7FAFD;stroke:#9DB4CC;stroke-width:2;transition:fill .2s,stroke .2s}
.zone.has *{fill:#BFD9F2;stroke:var(--teal)}
.zone:hover *,.zone.active *,.zone:focus-visible *{fill:var(--coral);stroke:#8E2A12}
.zone .line{fill:none!important;stroke:#9DB4CC}
.zone.has .line{stroke:var(--teal)}
.zone:hover .line,.zone.active .line{stroke:#fff}
.zone:focus-visible *{stroke-width:3.5}
.legend{display:flex;gap:16px;justify-content:center;align-items:center;margin:8px 0 0}
.dot{display:inline-block;width:12px;height:12px;border-radius:50%;background:#F7FAFD;border:2px solid #9DB4CC;margin-right:6px;vertical-align:-1px}
.dot.has{background:#BFD9F2;border-color:var(--teal)}
.atlas-panel{min-height:380px}
.atlas-panel h2{margin-top:10px}
.robot-card{background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:20px;margin-top:14px}
.robot-card h3{margin:.5em 0 .3em}
.robot-card.empty{border-style:dashed;background:transparent}
.chips{list-style:none;padding:0;margin:22px 0 0;display:flex;flex-wrap:wrap;gap:10px}
.chip{font:inherit;font-size:.92rem;font-weight:500;padding:8px 16px;border-radius:999px;border:1.5px solid var(--line);background:#fff;color:var(--ink);cursor:pointer}
.chip.has{border-color:var(--teal);background:var(--mint)}
.chip:hover{border-color:var(--coral)}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.project{scroll-margin-top:90px}
@media (max-width:900px){.atlas{grid-template-columns:1fr}#body{max-height:520px}.atlas-panel{min-height:0}}
#body .figure{pointer-events:none}

/* Atlas v2: front and back views */
.atlas{grid-template-columns:minmax(320px,540px) 1fr}
.views{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.view{margin:0}
.view svg{width:100%;height:auto;max-height:none}
.view figcaption{font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:4px}
.view .figure path{fill:url(#bodyG);stroke:#D8C6B0;stroke-width:2}
.viewswitch{display:none;background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px;margin:0 auto 12px;width:fit-content}
.viewswitch button{border:none;background:transparent;font:inherit;font-weight:600;padding:8px 20px;border-radius:999px;cursor:pointer;color:var(--muted)}
.viewswitch button[aria-pressed="true"]{background:var(--teal);color:#fff}
@media (max-width:900px){
  .atlas{grid-template-columns:1fr}
  .viewswitch{display:flex}
  .views{grid-template-columns:1fr}
  .view:not(.on){display:none}
  .view svg{max-height:560px}
}

/* Atlas robot cards: paper link only */
.robot-card .btn{padding:9px 20px;font-size:.92rem;margin-top:4px}
.robot-card .pending{color:var(--muted);font-size:.9rem;margin:4px 0 0}

/* Reading lists on the researcher hub */
.papers{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:12px}
.papers:empty::before{content:"Reading list coming soon";display:inline-block;font-size:.75rem;font-weight:600;padding:3px 10px;border-radius:999px;background:#E6EDF5;color:var(--muted)}
.papers li{font-size:.95rem;line-height:1.45;padding-left:14px;border-left:3px solid var(--mint)}
.papers li a{font-weight:600}
.papers li a::after{content:" \2197";font-weight:400}
.papers li span{display:block;color:var(--muted);font-size:.85rem;margin-top:2px}
.papers:empty{display:block}

/* Form selects */
.form select{width:100%;padding:14px 18px;border-radius:14px;border:2px solid var(--line);font:inherit;background:#fff;color:var(--ink)}
.form select:focus{outline:none;border-color:var(--teal)}
.form input[type=url]{width:100%;padding:14px 18px;border-radius:14px;border:2px solid var(--line);font:inherit;background:#fff;color:var(--ink)}
.form input[type=url]:focus{outline:none;border-color:var(--teal)}
.form .small{margin:0}

/* Navigation: keep links on one line, collapse to a menu on smaller screens */
.nav a.link{white-space:nowrap;padding:8px 12px}
@media (max-width:1100px){
  .menu-btn{display:block}
  .nav ul{display:none;position:absolute;top:68px;left:0;right:0;background:var(--bg);flex-direction:column;align-items:stretch;padding:14px 4%;border-bottom:1px solid var(--line)}
  .nav ul.open{display:flex}
}

/* Core topics accordion */
.topic-list{display:grid;gap:14px}
.topic-acc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.topic-acc summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:14px;padding:22px 28px;font-family:var(--font-display);font-size:1.3rem;font-weight:600;color:var(--ink)}
.topic-acc summary::-webkit-details-marker{display:none}
.topic-acc summary .t-name{flex:1}
.topic-acc summary::after{content:"";width:10px;height:10px;border-right:2.5px solid var(--teal);border-bottom:2.5px solid var(--teal);transform:rotate(45deg);transition:transform .2s;margin:0 4px 4px 0}
.topic-acc[open] summary::after{transform:rotate(-135deg);margin-bottom:-4px}
.topic-acc summary:hover{background:var(--bg);border-radius:var(--radius)}
.topic-acc summary:focus-visible{outline:3px solid var(--coral);outline-offset:2px}
.t-count{font-family:var(--font-body);font-size:.78rem;font-weight:600;padding:3px 12px;border-radius:999px;background:var(--mint);color:var(--teal-dark)}
.t-count.soon{background:#E6EDF5;color:var(--muted)}
.t-body{padding:0 28px 26px}
.t-body > p{color:var(--muted);margin-bottom:6px}
.t-papers .pending{color:var(--muted);font-size:.9rem;margin:10px 0 0}
.year{font-family:var(--font-display);font-size:1.5rem;color:var(--teal);margin:20px 0 6px;padding-bottom:6px;border-bottom:1px solid var(--line)}
.cta-add{margin-top:26px;display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--peach);border-color:#F5CDB9}
.cta-add h3{margin-bottom:.2em}
.cta-add p{margin:0;color:#5b3a2e}
@media (max-width:700px){.cta-add{flex-direction:column;align-items:flex-start}.topic-acc summary{padding:18px 20px;font-size:1.15rem}.t-body{padding:0 20px 22px}}
.cta-add .btn{white-space:nowrap;flex-shrink:0}

/* Privacy policy page */
.policy h2{font-size:1.5rem;margin:2em 0 .5em;scroll-margin-top:90px}
.policy h2:first-child{margin-top:0}
.policy ul{padding-left:1.2em}
.policy li{margin-bottom:.5em}
.policy-summary{margin:24px 0}
.policy-summary h2,.policy-toc h2{font-size:1.25rem;margin-bottom:.5em}
.policy-summary ul{margin:0;padding-left:1.2em}
.policy-summary li{margin-bottom:.4em}
.policy-toc{margin-bottom:10px}
.policy-toc ol{columns:2;column-gap:28px;margin:0;padding-left:1.4em}
.policy-toc li{margin-bottom:.35em;break-inside:avoid}
.table-wrap{overflow-x:auto;margin:16px 0 20px;border:1px solid var(--line);border-radius:16px;background:#fff}
.policy table{border-collapse:collapse;width:100%;min-width:560px;font-size:.95rem}
.policy th,.policy td{text-align:left;vertical-align:top;padding:12px 16px;border-bottom:1px solid var(--line)}
.policy th{background:var(--mint);color:var(--teal-dark);font-weight:600}
.policy tr:last-child td{border-bottom:none}
.policy td:first-child{font-weight:600;white-space:nowrap}
@media (max-width:700px){.policy-toc ol{columns:1}.policy td:first-child{white-space:normal}}

/* Technical lists on the Learn page */
.tech-list{padding-left:1.2em;margin:.6em 0 1em}
.tech-list li{margin-bottom:.8em}