/* ==========================================================================
   10courses.com — shared design system
   Data-dense education marketplace. Port these tokens into your Tailwind/CSS.
   ========================================================================== */

:root{
  /* brand */
  --brand:#4338ca;          /* indigo 700 */
  --brand-600:#4f46e5;
  --brand-50:#eef2ff;
  --brand-100:#e0e7ff;
  --ink:#0f172a;            /* slate 900 – headings */
  --ink-2:#334155;          /* slate 700 – body */
  --muted:#64748b;          /* slate 500 – secondary */
  --hint:#94a3b8;           /* slate 400 */
  --line:#e2e8f0;           /* slate 200 – borders */
  --line-2:#eef2f6;
  --bg:#f6f7fb;             /* page */
  --card:#ffffff;
  /* semantic */
  --amber:#f59e0b;          /* affiliate / enroll */
  --amber-600:#d97706;
  --green:#16a34a;          /* free / positive */
  --green-50:#f0fdf4;
  --red:#e11d48;            /* bestseller / hot */
  --star:#f59e0b;
  --radius:12px;
  --radius-sm:8px;
  --shadow:0 1px 3px rgba(15,23,42,.08);
  --shadow-md:0 4px 16px rgba(15,23,42,.10);
  --maxw:1240px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
:target{scroll-margin-top:130px}
::selection{background:var(--brand-100);color:var(--ink)}
body{
  margin:0;background:var(--bg);color:var(--ink-2);
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
h1,h2,h3,h4{color:var(--ink);margin:0;line-height:1.2;font-weight:800}
p{margin:0 0 12px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.hint{color:var(--hint)}
.tabnum{font-variant-numeric:tabular-nums}

/* ---------- top strip ---------- */
.tip{background:var(--ink);color:#cbd5e1;font-size:12.5px}
.tip .wrap{display:flex;gap:18px;align-items:center;justify-content:center;height:34px;flex-wrap:wrap}
.tip b{color:#fff}
.tip a{color:#c7d2fe;font-weight:600}

/* ---------- header ---------- */
header.site{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:18px;height:62px}
.logo{font-size:21px;font-weight:900;color:var(--ink);letter-spacing:-.02em;white-space:nowrap}
.logo b{color:var(--brand)}
.logo span{display:inline-block;background:var(--brand);color:#fff;border-radius:7px;padding:1px 7px;margin-right:2px}
.hsearch{flex:1;display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--line);
  border-radius:100px;padding:0 6px 0 16px;height:42px;max-width:520px}
.hsearch:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-50)}
.hsearch input{border:0;background:transparent;flex:1;font-size:14px;outline:none;color:var(--ink)}
input:focus,select:focus{outline:none;border-color:var(--brand)!important;box-shadow:0 0 0 3px var(--brand-50)}
details summary::-webkit-details-marker{display:none}
details summary::after{content:'+';float:right;color:var(--hint);font-weight:800;font-size:18px;line-height:1}
details[open] summary::after{content:'–'}
.hsearch button{border:0;background:var(--brand);color:#fff;height:32px;padding:0 16px;border-radius:100px;
  font-weight:700;font-size:13px;cursor:pointer}
.mainnav{display:flex;gap:20px;align-items:center;font-size:14px;font-weight:600}
.mainnav a{color:var(--ink-2);padding:6px 0;white-space:nowrap}
.mainnav a:hover{color:var(--brand)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border-radius:8px;font-weight:700;
  cursor:pointer;border:1px solid transparent;font-size:14px;padding:9px 16px;transition:transform .1s,opacity .1s;white-space:nowrap}
.btn:active{transform:scale(.97);opacity:.9}
.btn-primary{background:var(--brand);color:#fff}
.btn-amber{background:var(--amber);color:#3a2606}
.btn-amber:hover{background:var(--amber-600);color:#fff}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-block{width:100%}
.btn-sm{padding:7px 12px;font-size:13px}

/* ---------- generic bits ---------- */
.chip{display:inline-flex;align-items:center;gap:6px;background:#fff;border:1px solid var(--line);
  border-radius:100px;padding:6px 13px;font-size:13px;font-weight:600;color:var(--ink-2);cursor:pointer}
.chip:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-50)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.pill{display:inline-flex;align-items:center;gap:5px;border-radius:100px;padding:3px 9px;font-size:11.5px;font-weight:700;letter-spacing:.02em}
.pill-free{background:var(--green-50);color:var(--green)}
.pill-best{background:#fff1f2;color:var(--red)}
.pill-new{background:var(--brand-50);color:var(--brand)}
.pill-deg{background:#fffbeb;color:var(--amber-600)}
.label{font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.stars{color:var(--star);letter-spacing:1px;font-size:13px}
.rate{display:inline-flex;align-items:baseline;gap:5px}
.rate b{color:var(--ink);font-weight:800}
.sec{padding:34px 0}
.sec-h{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.sec-h h2{font-size:23px}
.sec-h p{margin:4px 0 0;font-size:13.5px}
.seeall{font-size:13.5px;font-weight:700;color:var(--brand);white-space:nowrap}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
/* clickable cards lift on hover */
a.card{transition:transform .14s ease,box-shadow .14s ease,border-color .14s ease}
a.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--brand-100)}
a.card:active{transform:translateY(-1px)}

/* provider logo badge (monogram) */
.logobadge{position:absolute;bottom:-14px;left:12px;width:38px;height:38px;border-radius:9px;background:#fff;
  border:1px solid var(--line);box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center;
  font-weight:900;font-size:15px;color:var(--ink)}
.thumb{position:relative}
.thumb .ttl{position:absolute;left:12px;bottom:10px;right:12px;color:#fff;font-weight:800;font-size:13px;
  text-shadow:0 1px 8px rgba(0,0,0,.35);line-height:1.25}
/* verified tick + provider row */
.prov{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:var(--muted)}
.prov .dot{width:16px;height:16px;border-radius:5px;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:9px;font-weight:900}
.tick{color:var(--brand);font-size:12px}

/* ---------- breadcrumb ---------- */
.crumb{font-size:12.5px;color:var(--muted);padding:14px 0 0}
.crumb a:hover{color:var(--brand)}
.crumb span{margin:0 6px;color:var(--hint)}

/* ---------- footer ---------- */
footer.site{background:var(--ink);color:#94a3b8;margin-top:40px;padding:44px 0 26px;font-size:13px}
footer.site h4{color:#fff;font-size:13px;letter-spacing:.04em;text-transform:uppercase;margin-bottom:12px}
.fcols{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:28px}
footer.site a{display:block;color:#94a3b8;padding:4px 0}
footer.site a:hover{color:#fff}
.fbot{border-top:1px solid #1e293b;margin-top:28px;padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12px}

/* utility grid */
.g{display:grid;gap:16px}
@media(max-width:900px){
  .fcols{grid-template-columns:1fr 1fr}
  .mainnav,.hsearch{display:none}
}

/* ===== .prose — monolithic editorial content (SEO depth) ===== */
.prose{color:var(--ink-2);font-size:15.5px;line-height:1.75;max-width:760px}
.prose > *:first-child{margin-top:0}
.prose h2{font-size:22px;font-weight:800;color:var(--ink);margin:30px 0 10px;letter-spacing:-.01em;scroll-margin-top:130px}
.prose h3{font-size:18px;font-weight:800;color:var(--ink);margin:22px 0 8px}
.prose h4{font-size:15.5px;font-weight:800;color:var(--ink);margin:18px 0 6px}
.prose p{margin:0 0 14px}
.prose ul,.prose ol{margin:0 0 16px;padding-left:22px}
.prose li{margin:6px 0}
.prose li::marker{color:var(--brand)}
.prose a{color:var(--brand);font-weight:600;text-decoration:underline;text-underline-offset:2px}
.prose strong,.prose b{color:var(--ink);font-weight:700}
.prose blockquote{margin:18px 0;padding:12px 16px;border-left:3px solid var(--brand);background:var(--brand-50);border-radius:0 8px 8px 0;color:var(--ink-2)}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;display:block;overflow-x:auto}
.prose th{background:var(--bg);text-align:left;padding:10px 12px;font-weight:700;color:var(--ink);border:1px solid var(--line)}
.prose td{padding:10px 12px;border:1px solid var(--line)}
.prose tr:nth-child(even) td{background:#fafbfe}
.prose img{border-radius:10px;margin:14px 0}
.prose hr{border:0;border-top:1px solid var(--line);margin:26px 0}
.prose code{background:var(--bg);border:1px solid var(--line);border-radius:5px;padding:1px 6px;font-size:13px}
/* callout box for key takeaways */
.prose .callout{background:var(--green-50);border:1px solid #bbf7d0;border-radius:10px;padding:14px 16px;margin:18px 0}
.prose .callout b{color:var(--green)}
/* on-page table of contents */
.toc{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:0 0 20px}
.toc .label{margin-bottom:8px}
.toc a{display:block;color:var(--ink-2);font-size:13.5px;padding:4px 0;font-weight:600}
.toc a:hover{color:var(--brand)}
/* empty-hub content-first CTA */
.emptybox{background:var(--brand-50);border:1px dashed var(--brand-100);border-radius:12px;padding:22px;text-align:center}

/* ===== CSS-only "read more" (server-side, no JS) ===== */
.rm-toggle{position:absolute;opacity:0;pointer-events:none}
.rm-body{position:relative;max-height:132px;overflow:hidden;transition:max-height .2s}
.rm-body::after{content:"";position:absolute;left:0;right:0;bottom:0;height:56px;background:linear-gradient(transparent,#fff)}
.rm-toggle:checked ~ .rm-body{max-height:4000px}
.rm-toggle:checked ~ .rm-body::after{display:none}
.rm-label{display:inline-flex;align-items:center;gap:4px;margin-top:10px;color:var(--brand);font-weight:700;font-size:13.5px;cursor:pointer;user-select:none}
.rm-label .less{display:none}
.rm-toggle:checked ~ .rm-label .more{display:none}
.rm-toggle:checked ~ .rm-label .less{display:inline}

/* ---- search typeahead ---- */
.sugg{position:absolute;top:calc(100% + 6px);left:0;right:0;background:#fff;border:1px solid var(--line);
  border-radius:12px;box-shadow:var(--shadow-md);z-index:60;overflow:hidden;max-height:70vh;overflow-y:auto}
.sugg-i{display:flex;gap:10px;align-items:center;padding:9px 13px;text-decoration:none;border-bottom:1px solid var(--line-2)}
.sugg-i:last-child{border-bottom:0}
.sugg-i:hover,.sugg-i.on{background:var(--brand-50)}
.sugg-ic{width:26px;height:26px;border-radius:6px;background:var(--bg);display:flex;align-items:center;
  justify-content:center;font-size:14px;flex:none;overflow:hidden}
.sugg-ic img{width:100%;height:100%;object-fit:contain;background:#fff;padding:3px}
.sugg-t{font-size:13.5px;font-weight:700;color:var(--ink);line-height:1.25;min-width:0}
.sugg-m{display:block;font-size:11.5px;font-weight:500;color:var(--muted);margin-top:1px}

/* ---- CSS-only tabs (server-rendered, no JS; every pane stays in the HTML for crawlers) ---- */
.tabs{position:relative}
.tabin{position:absolute;opacity:0;pointer-events:none}
.tabbar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:4px}
.tablab{display:inline-flex;gap:6px;align-items:center;padding:8px 14px;border:1px solid var(--line);
  border-radius:999px;background:#fff;font-size:13.5px;font-weight:700;color:var(--ink-2);cursor:pointer;
  user-select:none;transition:.15s}
.tablab:hover{border-color:var(--brand-100);color:var(--brand)}
.tabpane{display:none;margin-top:6px}
/* pane N shows when radio N is checked — panes carry an explicit .p{N} index class */
.tabin:nth-of-type(1):checked ~ .tabbar .tablab:nth-of-type(1),
.tabin:nth-of-type(2):checked ~ .tabbar .tablab:nth-of-type(2),
.tabin:nth-of-type(3):checked ~ .tabbar .tablab:nth-of-type(3),
.tabin:nth-of-type(4):checked ~ .tabbar .tablab:nth-of-type(4),
.tabin:nth-of-type(5):checked ~ .tabbar .tablab:nth-of-type(5),
.tabin:nth-of-type(6):checked ~ .tabbar .tablab:nth-of-type(6){background:var(--brand);border-color:var(--brand);color:#fff}
.tabin:nth-of-type(1):checked ~ .p1,
.tabin:nth-of-type(2):checked ~ .p2,
.tabin:nth-of-type(3):checked ~ .p3,
.tabin:nth-of-type(4):checked ~ .p4,
.tabin:nth-of-type(5):checked ~ .p5,
.tabin:nth-of-type(6):checked ~ .p6{display:block}
@media(max-width:640px){.tabbar{overflow-x:auto;flex-wrap:nowrap;padding-bottom:4px}.tablab{white-space:nowrap}}

/* ---- home course-finder module (progressive screens) ---- */
.ffind{padding:16px 18px}
.ffind-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap}
.ffind-title{font-weight:900;color:var(--ink);font-size:16.5px}
.ffind-sub{color:var(--muted);font-size:12.5px;margin-top:2px}
.ffind-dots{display:flex;gap:6px;align-items:center;padding-top:6px}
.ffdot{width:7px;height:7px;border-radius:50%;background:var(--line);transition:.2s}
.ffdot.on{background:var(--brand);transform:scale(1.25)}
.ffdot.done{background:var(--brand-100)}
.ffind-body{margin-top:12px}
.ffscreen{border:0;padding:0;margin:0 0 14px}
.ffq{font-weight:800;color:var(--ink);font-size:14.5px;padding:0;display:block;margin-bottom:9px}
.ffhint{display:block;font-weight:500;font-size:12.5px;color:var(--muted);margin-top:2px}
.ffopts{display:flex;gap:8px;flex-wrap:wrap}
.ffopt{position:relative;display:inline-flex}
.ffopt input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}
.ffopt span{display:inline-block;padding:8px 14px;border:1px solid var(--line);border-radius:999px;
  font-size:13.5px;font-weight:600;color:var(--ink-2);background:#fff;transition:.15s;cursor:pointer}
.ffopt:hover span{border-color:var(--brand-100);color:var(--brand)}
.ffopt input:checked + span{background:var(--brand);border-color:var(--brand);color:#fff}
.ffopt input:focus-visible + span{outline:2px solid var(--brand);outline-offset:2px}
.ffopt-alt span{background:var(--brand-50);border-color:var(--brand-100)}
.ffcert{display:inline-flex;gap:8px;align-items:center;margin-top:11px;font-size:13px;color:var(--ink-2);cursor:pointer}
.ffind-foot{display:flex;gap:10px;align-items:center;flex-wrap:wrap;border-top:1px solid var(--line-2);padding-top:12px;margin-top:2px}
.ffskip{font-size:12.5px;color:var(--brand);font-weight:600;margin-left:auto}
/* JS mode: one screen at a time */
.ffind [hidden]{display:none!important}   /* .btn sets display, which beats the UA [hidden] rule */
.ffind.js .ffscreen{display:none}
.ffind.js .ffscreen.on{display:block;animation:ffin .18s ease-out}
@keyframes ffin{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}

/* ---- course-finder filter rail (collapsed groups) ---- */
.ffgrp{border-bottom:1px solid var(--line-2)}
.ffgrp:last-child{border-bottom:0}
.ffgrp>summary{list-style:none;cursor:pointer;padding:11px 16px;display:flex;justify-content:space-between;
  align-items:center;gap:10px;transition:.15s}
.ffgrp>summary::-webkit-details-marker{display:none}
.ffgrp>summary:hover{background:var(--bg)}
.ffgrp>summary::after{content:'▾';color:var(--muted);font-size:12px;line-height:1;transition:.2s}
.ffgrp[open]>summary::after{content:'▴';color:var(--brand)}
.ffgrp.set>summary{background:var(--brand-50)}
.ffgrp.set .ffgrp-t{color:var(--brand)}
.ffgrp-t{font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--muted)}
.ffgrp-v{margin-left:auto;font-size:13px;font-weight:700;color:var(--ink);text-align:right;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:130px}
.ffgrp-b{padding:2px 8px 10px}
.ffrow{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:7px 8px;border-radius:8px;
  text-decoration:none;font-size:13.5px;color:var(--ink-2)}
.ffrow:hover{background:var(--brand-50);color:var(--brand)}
.ffrow.on{background:var(--brand);color:#fff;font-weight:700}
.ffrow b{font-size:12px;font-weight:700;color:var(--muted)}
.ffrow.on b,.ffrow:hover b{color:inherit;opacity:.85}