/* Shared masthead for all four labs: fixed geometry prevents wrapping jumps. */
.top,body.range-page header{position:sticky;top:0;z-index:50;box-sizing:border-box}
.top .nav,body.range-page header .nav{width:min(1500px,96%);height:68px;min-height:68px;box-sizing:border-box;display:flex;flex-direction:row;flex-wrap:nowrap;align-items:center;justify-content:space-between;gap:16px;padding:0;overflow:hidden}
.top .brand,body.range-page header .brand{display:block;flex:0 0 auto;min-width:154px;white-space:nowrap;line-height:1.15}
.top .brand small{display:none}
.top .navlinks,body.range-page header .nav nav{display:flex;flex:1 1 auto;min-width:0;height:42px;align-items:center;justify-content:flex-end;gap:7px;flex-wrap:nowrap;overflow-x:auto;overflow-y:hidden;white-space:nowrap;scrollbar-width:thin;scrollbar-color:#2b647c #07111d}
.top .navlinks a,body.range-page header .nav nav a{display:inline-flex;flex:0 0 auto;align-items:center;min-height:34px;padding:6px 7px;font-size:12px;line-height:1.1;white-space:nowrap}
.top .navlinks a:focus-visible,body.range-page header .nav nav a:focus-visible{outline:2px solid #6ce8ff;outline-offset:-2px;border-radius:6px}
@media(max-width:900px){
 .top .nav,body.range-page header .nav{height:92px;min-height:92px;flex-direction:column;align-items:stretch;justify-content:center;gap:3px;padding:7px 0}
 .top .brand,body.range-page header .brand{min-height:24px}
 .top .navlinks,body.range-page header .nav nav{flex:0 0 40px;height:40px;justify-content:flex-start;gap:7px}
}
@media(max-width:540px){
 .top .nav,body.range-page header .nav{height:94px;min-height:94px}
 .top .navlinks a,body.range-page header .nav nav a{font-size:12px;padding:6px 8px}
}