/* Liberty Tutors: one face, Liberty navy and red, hairlines only. */
:root{
  --navy:#0A254E; --navy-2:#16386E; --navy-ink:#0E1C33;
  --red:#C41230; --red-2:#A30F28;
  --ink:#1D2433; --muted:#566074; --line:#D9DEE6; --wash:#F3F5F8; --paper:#FFFFFF;
  --w:1160px; --text:720px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16.5px/1.66 "Public Sans",system-ui,-apple-system,"Segoe UI",Arial,sans-serif}
img{max-width:100%;height:auto}
a{color:var(--navy-2);text-underline-offset:2px}
a:hover{color:var(--red)}
h1,h2,h3,h4{color:var(--navy);line-height:1.22;margin:0 0 .5em;font-weight:700}
h1{font-size:34px;letter-spacing:-.01em}
h2{font-size:24px;margin-top:1.9em}
h3{font-size:18.5px;margin-top:1.4em;color:var(--navy-ink)}
p{margin:0 0 1em}
ul,ol{padding-left:1.25em;margin:0 0 1.1em}
li{margin:.3em 0}
.wrap{max-width:var(--w);margin:0 auto;padding:0 22px}

/* header */
.site-head{background:var(--navy);color:#fff;position:sticky;top:0;z-index:40}
.site-head .wrap{display:flex;align-items:center;gap:26px;height:64px}
.brand{color:#fff;text-decoration:none;font-weight:700;font-size:19px;white-space:nowrap}
.brand:hover{color:#fff}
.nav{display:flex;gap:22px;margin-left:auto}
.nav a{color:#E6EBF3;text-decoration:none;font-size:15px}
.nav a:hover,.nav a[aria-current]{color:#fff;text-decoration:underline;text-underline-offset:6px}
.head-cta{margin-left:4px}
.burger{display:none;background:none;border:1px solid rgba(255,255,255,.45);color:#fff;font-size:15px;padding:6px 12px;border-radius:4px;cursor:pointer;margin-left:auto}

/* buttons */
.btn{display:inline-block;background:var(--red);color:#fff;text-decoration:none;font-weight:600;font-size:15px;padding:10px 18px;border-radius:4px;border:1px solid var(--red);cursor:pointer;font-family:inherit}
.btn:hover{background:var(--red-2);border-color:var(--red-2);color:#fff}
.btn-quiet{background:transparent;color:var(--navy);border-color:var(--navy)}
.btn-quiet:hover{background:var(--navy);color:#fff;border-color:var(--navy)}

/* page frame */
main{padding:22px 0 56px}
.crumbs{font-size:14px;color:var(--muted);margin:4px 0 18px}
.crumbs a{color:var(--muted)}
.crumbs span[aria-hidden]{margin:0 7px;color:#9AA3B2}
.page-head{max-width:860px;margin-bottom:22px}
.byline{color:var(--muted);font-size:14.5px;margin-top:6px}
.layout{display:grid;grid-template-columns:minmax(0,var(--text)) 300px;gap:56px;align-items:start}
.article{min-width:0}
.rail{font-size:15px}
.rail h4{font-size:15px;color:var(--navy);margin:0 0 8px}
.rail .box{border:1px solid var(--line);border-radius:4px;padding:16px 18px;margin-bottom:18px;background:#fff}
.rail ol,.rail ul{list-style:none;padding:0;margin:0}
.rail li{margin:0;border-top:1px solid var(--line)}
.rail li:first-child{border-top:0}
.rail li a{display:block;padding:7px 0;text-decoration:none;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rail li a:hover,.rail li a.is-here{color:var(--red)}
.rail li a.is-on{color:var(--navy);font-weight:600}
@media (max-width:1100px){
  .layout{display:block}
  .rail{position:static;margin-top:36px}
}

/* answer + facts */
.lead-box{background:var(--wash);border:1px solid var(--line);border-radius:4px;padding:18px 20px;margin:0 0 22px}
.lead-box p:last-child{margin:0}
.table-wrap{overflow-x:auto;margin:0 0 1.3em}
table{border-collapse:collapse;width:100%;font-size:15.5px}
th,td{text-align:left;vertical-align:top;padding:9px 12px;border-bottom:1px solid var(--line)}
th{color:var(--navy);font-weight:600;background:var(--wash)}
.facts th{width:34%;background:transparent;font-weight:600}
.facts tr:first-child th,.facts tr:first-child td{border-top:1px solid var(--line)}
td.num,th.num{text-align:right;white-space:nowrap}

/* method */
.steps{padding-left:1.3em}
.steps>li{margin:0 0 14px;padding-left:4px}
.steps>li::marker{color:var(--navy);font-weight:700}
.steps h3{margin:0 0 3px;font-size:17px;display:inline}
.steps h3+p{margin:3px 0 0}

/* worked example */
.model{border:1px solid var(--line);border-radius:4px;margin:0 0 1.2em}
.model-head{padding:10px 18px;border-bottom:1px solid var(--line);font-weight:600;color:var(--navy);font-size:15px}
.model-body{padding:16px 18px;font-family:"Public Sans",system-ui,sans-serif}
.model-body p:last-child{margin:0}
.model sup{color:var(--red);font-weight:700;font-size:12px;margin-left:1px}
.model-notes{margin:0;padding:12px 18px 12px 38px;border-top:1px solid var(--line);background:var(--wash);font-size:15px}
.model-notes li{margin:.35em 0}

.checklist{list-style:none;padding:0}
.checklist li{position:relative;padding-left:28px}
.checklist li::before{content:"";position:absolute;left:2px;top:.45em;width:12px;height:7px;border-left:2px solid var(--navy);border-bottom:2px solid var(--navy);transform:rotate(-45deg)}

.faq details{border-top:1px solid var(--line);padding:12px 0}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:600;color:var(--navy-ink)}
.faq details p{margin:.6em 0 0}

.help{border:1px solid var(--line);border-radius:4px;padding:20px 22px;margin:2em 0 0;display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.help h3{margin:0 0 4px}
.help p{margin:0;color:var(--muted);max-width:480px}

.related{list-style:none;padding:0}
.related li{border-top:1px solid var(--line);margin:0}
.related li:last-child{border-bottom:1px solid var(--line)}
.related a{display:block;padding:9px 0;text-decoration:none}

/* forms */
.ask label{display:block;font-size:14px;color:var(--muted);margin:8px 0 3px}
.ask input,.ask textarea{width:100%;font:inherit;font-size:15px;padding:9px 10px;border:1px solid #C3CAD5;border-radius:4px;background:#fff;color:var(--ink)}
.ask textarea{min-height:84px;resize:vertical}
.ask .btn{width:100%;margin-top:12px}
.ask .done{color:var(--navy);font-weight:600}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}

/* catalog + cards */
.filters{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 18px;align-items:center}
.filters input,.filters select{font:inherit;font-size:15px;padding:9px 10px;border:1px solid #C3CAD5;border-radius:4px;background:#fff}
.filters input{flex:1;min-width:220px}
.course-table td:first-child{white-space:nowrap;font-weight:600}
.course-table a{text-decoration:none}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin:0 0 1.4em}
.card{border:1px solid var(--line);border-radius:4px;padding:16px 18px;text-decoration:none;color:var(--ink);display:block}
.card:hover{border-color:var(--navy)}
.card b{display:block;color:var(--navy);font-size:16.5px;margin-bottom:4px}
.card span{color:var(--muted);font-size:15px}
.home-hero{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:48px;align-items:start;padding:18px 0 8px}
.home-hero h1{font-size:38px}
.home-hero .sub{font-size:18px;color:var(--muted);max-width:620px}
.find{display:flex;gap:10px;margin:18px 0 8px;max-width:600px}
.find input{flex:1;font:inherit;padding:11px 12px;border:1px solid #C3CAD5;border-radius:4px}
.cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:30px}
.cols h3{margin-top:0}
.prose{max-width:var(--text)}
@media (max-width:900px){.home-hero{grid-template-columns:1fr}.cols{grid-template-columns:1fr}}

/* footer */
.site-foot{border-top:1px solid var(--line);background:var(--wash);padding:34px 0 22px;font-size:15px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.foot-grid h4{font-size:15px;margin:0 0 8px}
.foot-grid a{display:block;color:var(--ink);text-decoration:none;padding:3px 0}
.foot-grid a:hover{color:var(--red)}
.foot-name{font-weight:700;color:var(--navy);font-size:17px;margin-bottom:6px}
.foot-grid p{color:var(--muted);margin:0}
.foot-base{border-top:1px solid var(--line);margin-top:24px;padding-top:14px;color:var(--muted);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.foot-base a{color:var(--muted)}
@media (max-width:820px){.foot-grid{grid-template-columns:1fr 1fr}}

/* chat */
.chat-launch{position:fixed;right:20px;bottom:20px;z-index:60;width:56px;height:56px;border-radius:50%;background:var(--navy);border:0;color:#fff;cursor:pointer;box-shadow:0 4px 14px rgba(10,37,78,.28);display:flex;align-items:center;justify-content:center}
.chat-launch:hover{background:var(--navy-2)}
.chat-nudge{position:fixed;right:20px;bottom:86px;z-index:60;max-width:260px;background:#fff;border:1px solid var(--line);border-radius:6px;padding:10px 12px;font-size:14.5px;box-shadow:0 4px 14px rgba(0,0,0,.08);display:none;cursor:pointer}
.chat-nudge.is-on{display:block}
.chat-panel{position:fixed;right:20px;bottom:86px;z-index:61;width:350px;max-width:calc(100vw - 24px);height:470px;max-height:calc(100vh - 110px);background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 10px 30px rgba(0,0,0,.14);display:none;flex-direction:column;overflow:hidden}
.chat-panel.is-open{display:flex}
.chat-head{background:var(--navy);color:#fff;padding:12px 14px;display:flex;align-items:center;justify-content:space-between}
.chat-head b{font-size:15.5px}
.chat-head span{display:block;font-size:13px;color:#D5DDEA}
.chat-x{background:none;border:0;color:#fff;font-size:20px;cursor:pointer;line-height:1}
.chat-log{flex:1;overflow-y:auto;padding:12px;background:var(--wash)}
.msg{max-width:84%;padding:8px 11px;border-radius:6px;margin:0 0 8px;font-size:14.5px;line-height:1.45;background:#fff;border:1px solid var(--line)}
.msg.me{margin-left:auto;background:var(--navy);color:#fff;border-color:var(--navy)}
.chat-form{display:flex;border-top:1px solid var(--line)}
.chat-form input{flex:1;border:0;padding:12px;font:inherit;font-size:15px;outline:none}
.chat-form button{border:0;background:var(--red);color:#fff;padding:0 16px;font:inherit;font-weight:600;cursor:pointer}

@media (max-width:860px){
  h1{font-size:28px}
  .home-hero h1{font-size:30px}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:var(--navy);flex-direction:column;gap:0;padding:6px 22px 14px}
  .nav.is-open{display:flex}
  .nav a{padding:9px 0;border-top:1px solid rgba(255,255,255,.12)}
  .burger{display:block}
  .head-cta{display:none}
}