html{-webkit-text-size-adjust:100%}
body{margin:0}
img{max-width:100%}
[hidden]{display:none!important}
/* Layout: Research page. A wide intro, a row of six topic buttons that swap the panel below,
   each panel split into the short summary (left) and key findings (right) with a practice box underneath,
   then a clinical bridge, limits, and a request-the-paper form. Same palette as the home page. */
:root{
  --paper:#ECEAE2;
  --paper-2:#E3E0D5;
  --chalk:#F5F3EC;
  --sand:#E9DDC3;
  --sand-dark:#DDCDAA;
  --ink:#171717;
  --soft:#57534C;
  --moss:#445C45;
  --moss-dark:#171717;
  --accent:#171717;
  --accent-hover:#3D3D3D;
  --line:#B9B6A8;
  --display:'Big Shoulders Display', 'Arial Narrow', Impact, sans-serif;
  --serif:'Source Serif 4','Times New Roman', Times, 'Liberation Serif', serif;
  --sans:'Public Sans', system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
  --gutter:clamp(20px, 4.5vw, 72px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--paper); color:var(--ink); font-family:var(--sans); font-size:18px; line-height:1.7; -webkit-font-smoothing:antialiased}
a{color:var(--moss-dark); text-underline-offset:3px}
a:hover{color:var(--soft)}
:focus-visible{outline:3px solid var(--ink); outline-offset:3px}
.wrap{max-width:1520px; margin:0 auto; padding-left:max(var(--gutter), env(safe-area-inset-left, 0px)); padding-right:max(var(--gutter), env(safe-area-inset-right, 0px))}
h1,h2,h3{font-family:var(--serif); font-weight:700; color:inherit; text-wrap:balance; margin:0}
h1{font-family:var(--display); text-transform:uppercase; font-weight:800; font-size:clamp(42px,6.4vw,92px); line-height:1.02; letter-spacing:.01em}
h2{font-family:var(--display); font-weight:800; font-size:clamp(38px,4.6vw,60px); line-height:1.04; letter-spacing:.01em}
h3{font-size:24px; line-height:1.2}
p{margin:0 0 1.1em; max-width:66ch}

/* header and footer, shared with the home page */
.site-header{border-bottom:1px solid var(--line)}
.header-inner{display:flex; align-items:center; justify-content:space-between; gap:14px 32px; flex-wrap:wrap; padding-block:20px}
.brand{font-family:var(--serif); font-weight:700; font-size:23px; letter-spacing:.06em; text-transform:uppercase; text-decoration:none; color:var(--ink); white-space:nowrap}
.brand span{color:var(--moss)}
.site-footer .brand span{color:#A9BFA9}
.brand:hover{color:var(--ink)}
.nav{display:flex; flex-wrap:wrap; align-items:center; gap:6px 28px; list-style:none; margin:0; padding:0}
.nav a{font-size:15.5px; font-weight:500; color:var(--soft); text-decoration:none; padding:4px 0; border-bottom:2px solid transparent}
.nav a:hover{color:var(--ink); border-bottom-color:var(--line)}
.nav a[aria-current="page"]{color:var(--ink); border-bottom-color:var(--ink)}
.site-footer{background:var(--ink); color:var(--chalk); padding-block:44px 36px}
.footer-grid{display:flex; flex-wrap:wrap; justify-content:space-between; gap:20px 32px; align-items:center}
.site-footer .brand{color:var(--chalk)}
.footer-links{display:flex; flex-wrap:wrap; gap:8px 24px; list-style:none; margin:0; padding:0}
.footer-links a{font-size:15px; color:var(--chalk); text-decoration:none}
.footer-links a:hover{color:var(--chalk); text-decoration:underline}
.fine{font-size:14px; color:rgba(245,243,236,.7); margin:24px 0 0; max-width:80ch}

.btn{display:inline-block; font-family:var(--sans); font-size:16px; font-weight:600; padding:14px 26px; border:2px solid var(--ink); color:var(--ink); text-decoration:none; background:transparent; cursor:pointer; transition:background .15s,color .15s,border-color .15s}
.btn:hover{background:var(--ink); color:var(--paper)}
.btn-primary{background:var(--accent); border-color:var(--accent); color:#fff}
.btn-primary:hover{background:var(--accent-hover); border-color:var(--accent-hover); color:#fff}

/* intro */
.intro{padding-block:64px 40px}
.intro .lead{font-size:clamp(19px,1.6vw,23px); line-height:1.6; margin-top:26px; max-width:78ch}
.intro-links{display:flex; flex-wrap:wrap; gap:12px; margin-top:28px}

/* topic buttons */
.explorer{padding-block:24px 80px}
.tabs-label{font-size:15px; font-weight:600; color:var(--soft); margin:0 0 12px}
.tablist{display:flex; flex-wrap:wrap; gap:10px; padding:0; margin:0 0 36px}
.tab{
  font-family:var(--sans); font-size:16px; font-weight:600; color:var(--ink);
  background:var(--sand); border:2px solid var(--ink); padding:12px 20px; cursor:pointer;
  transition:background .15s,color .15s;
}
.tab:hover{background:var(--sand-dark)}
.tab[aria-selected="true"]{background:var(--ink); color:#fff}

/* panel */
.panel-grid{display:grid; grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr); gap:clamp(32px,5vw,88px); align-items:start}
.panel-main h2{margin-bottom:22px}
.panel-main p{font-size:19px; line-height:1.7}
.findings{background:var(--sand); color:var(--ink); border:2px solid var(--ink); padding:34px clamp(24px,3vw,40px) 18px}
@media (min-width:861px){ .findings{position:sticky; top:24px} }
.findings h3{font-family:var(--display); text-transform:uppercase; font-weight:800; font-size:34px; letter-spacing:.02em; line-height:1; margin-bottom:10px}
.findings ul{list-style:none; margin:0; padding:0}
.findings li{position:relative; padding:20px 0 20px 28px; border-top:1px solid rgba(23,23,23,.35); font-size:19.5px; line-height:1.55}
.findings li::before{content:""; position:absolute; left:0; top:31px; width:10px; height:10px; background:var(--ink)}
.practice{margin-top:44px; background:var(--chalk); border:1px solid var(--line); padding:32px clamp(20px,3vw,44px); font-size:19px}
.practice .label{font-size:15px; font-weight:600; letter-spacing:.04em; text-transform:uppercase; color:var(--soft); margin:0 0 10px}
.practice p:last-child{margin-bottom:0; max-width:90ch}
.panel-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:28px}

/* beyond the sport and limits */
.pair{padding-block:72px; background:var(--sand); border-block:1px solid var(--line)}
.pair-grid{display:grid; grid-template-columns:minmax(0,.7fr) minmax(0,1.3fr); gap:clamp(32px,5vw,88px); align-items:start}
.pair p{font-size:19px}

/* request form */
.request{padding-block:80px 88px}
.request-grid{display:grid; grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr); gap:clamp(32px,5vw,88px); align-items:start}
.form{max-width:640px}
.field{margin-bottom:20px}
label{display:block; font-size:15px; font-weight:600; margin-bottom:6px}
input[type=text], input[type=email], select, textarea{
  width:100%; font-family:var(--sans); font-size:17px; color:var(--ink);
  background:var(--chalk); border:2px solid var(--ink); border-radius:0; padding:12px 14px;
}
textarea{min-height:110px; resize:vertical}
.hp{position:absolute; left:-9999px; height:0; overflow:hidden}
.form-status{margin-top:16px; padding:12px 16px; border-left:4px solid var(--ink); background:var(--chalk); display:none; max-width:640px}
.form-status.show{display:block}

@media (max-width:860px){
  .intro{padding-block:40px 28px}
  .panel-grid, .pair-grid, .request-grid{grid-template-columns:minmax(0,1fr)}
  .explorer{padding-block:16px 56px}
  .pair{padding-block:52px}
  .request{padding-block:56px 64px}
}
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} .btn,.tab{transition:none} }

/* citations, evidence labels, unknowns, sources */
.cite{font-size:.62em; line-height:0; vertical-align:super; font-weight:600; margin-left:1px}
.cite a{color:var(--ink); text-decoration:none; border-bottom:1px solid var(--ink)}
.cite a:hover{background:var(--sand)}
.etype{display:inline-block; font-family:var(--sans); font-size:12px; font-weight:600; letter-spacing:.07em; text-transform:uppercase; border:1.5px solid var(--ink); background:var(--chalk); padding:3px 8px; margin:0 0 8px}
.findings li .etype{display:table}
.basis{margin:26px 0 0; font-size:15.5px; line-height:1.55; color:var(--soft); border-left:4px solid var(--ink); padding:2px 0 2px 16px; max-width:64ch}
.basis b{color:var(--ink)}
.unknown{margin-top:28px; background:var(--chalk); border:2px solid var(--ink); padding:28px clamp(20px,3vw,44px)}
.unknown h3{font-family:var(--display); text-transform:uppercase; font-weight:800; font-size:30px; letter-spacing:.02em; line-height:1; margin-bottom:12px}
.unknown p{font-size:18px; line-height:1.65; margin:0 0 12px; max-width:90ch}
.unknown p:last-child{margin-bottom:0}
.sources{margin-top:28px; border-top:2px solid var(--ink)}
.sources summary{cursor:pointer; list-style:none; padding:16px 0; font-weight:600; font-size:17px; display:flex; justify-content:space-between; gap:12px}
.sources summary::-webkit-details-marker{display:none}
.sources summary::after{content:"Show"; font-size:13px; letter-spacing:.07em; text-transform:uppercase; color:var(--soft)}
.sources[open] summary::after{content:"Hide"}
.sources summary:focus-visible, .cite a:focus-visible{outline:3px solid var(--ink); outline-offset:3px}
.sources ol{margin:0 0 8px; padding-left:28px; display:grid; gap:12px; font-size:15.5px; line-height:1.55; color:var(--soft)}
.sources li{padding-left:4px}
.sources li:target{background:var(--sand); outline:6px solid var(--sand)}
.sources .refnote{font-size:14px; color:var(--soft); margin:0 0 18px; max-width:70ch}
.soon{display:inline-block; font-family:var(--display); font-weight:700; font-size:18px; letter-spacing:.1em; text-transform:uppercase; background:var(--sand); border:2px solid var(--ink); padding:4px 14px; margin:0 0 16px}

.privacy-note{font-size:14px; line-height:1.5; color:var(--soft); margin:12px 0 0; max-width:60ch}
.privacy-note a{color:inherit}