/* JS Testing Academy – Free QA Demo Site. Plain CSS, no frameworks, stable class names. */
:root{
  --brand:#2441e7; --brand-dark:#1a2fb0; --ink:#0f1633; --ink-2:#3b4262; --muted:#6b7190;
  --bg:#f6f7fc; --card:#ffffff; --line:#e3e7f5; --accent:#ff5a1f; --ok:#12a150; --err:#b4232a;
  --radius:12px; --shadow:0 8px 24px rgba(20,32,90,.07);
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink-2);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}
a{color:var(--brand)}
h1,h2,h3{color:var(--ink);line-height:1.25;margin:0 0 10px}
h1{font-size:30px}h2{font-size:21px}h3{font-size:17px}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}

/* header */
.site-head{background:#0c1230;color:#fff;padding:14px 0}
.site-head .wrap{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.site-head .brand{font-weight:800;color:#fff;text-decoration:none;font-size:18px}
.site-head .brand span{color:#8ea0ff}
.site-head nav{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.site-head nav a{color:#c9cfee;text-decoration:none;padding:7px 12px;border-radius:999px;font-size:14px;font-weight:600}
.site-head nav a:hover,.site-head nav a.on{background:#1d2760;color:#fff}

/* layout */
.page{display:grid;grid-template-columns:240px 1fr;gap:24px;padding:24px 0 48px}
.side{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px;height:max-content}
.side h4{margin:6px 8px 8px;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.side a{display:block;padding:9px 10px;border-radius:8px;color:var(--ink-2);text-decoration:none;font-size:14.5px}
.side a:hover{background:var(--bg)}
.side a.on{background:var(--brand);color:#fff;font-weight:600}
.main{min-width:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin-bottom:20px}

/* forms */
label{display:block;font-weight:600;color:var(--ink);margin:14px 0 6px;font-size:14.5px}
input[type=text],input[type=email],input[type=number],input[type=password],input[type=date],input[type=file],select,textarea{
  width:100%;max-width:520px;padding:11px 13px;border:1px solid var(--line);border-radius:9px;font:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(36,65,231,.12)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:16px}
.btn{display:inline-block;padding:10px 18px;border-radius:999px;border:2px solid transparent;background:var(--brand);color:#fff;
  font:600 15px/1.2 inherit;cursor:pointer}
.btn:hover{background:var(--brand-dark)}
.btn.sec{background:#fff;color:var(--brand);border-color:var(--line)}
.btn.warn{background:var(--accent)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.inline{display:inline-flex;align-items:center;gap:8px;margin:6px 18px 6px 0;font-weight:500;color:var(--ink-2)}
.inline input{width:auto;max-width:none}

/* output / messages */
.output{background:#f4f6fe;border:1px solid var(--line);border-radius:10px;padding:14px;margin-top:16px;font-size:14.5px}
.output:empty{display:none}
.output b{color:var(--ink)}
.msg{font-weight:700;margin-top:12px}
.msg.ok{color:var(--ok)}.msg.err{color:var(--err)}
code,kbd{background:#eef1fb;border-radius:5px;padding:2px 6px;font:13px ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--ink)}
pre{background:#0c1230;color:#dbe1ff;border-radius:10px;padding:14px;overflow:auto;font:13px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
pre .c{color:#8ea0ff}

/* tables */
table{border-collapse:collapse;width:100%;font-size:14.5px;background:#fff}
th,td{border:1px solid var(--line);padding:9px 11px;text-align:left}
th{background:#f4f6fe;color:var(--ink);font-weight:700}
tbody tr:hover{background:#fafbff}

/* practice box */
.practice{border:1px solid #f5d38a;background:#fff8ea;border-radius:var(--radius);padding:18px 22px;margin-bottom:20px}
.practice h3{color:#8a5a00}
.practice ol{margin:8px 0 0;padding-left:20px}
.practice li{margin-bottom:5px}
details{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin-bottom:20px}
details summary{cursor:pointer;font-weight:700;color:var(--ink)}
details[open] summary{margin-bottom:12px}
.tabs{display:flex;gap:6px;margin-bottom:10px}
.tabs button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;cursor:pointer;font:600 13.5px inherit;color:var(--ink-2)}
.tabs button.on{background:var(--brand);border-color:var(--brand);color:#fff}

/* home grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.grid a.tile{display:block;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-decoration:none;box-shadow:var(--shadow);transition:.15s}
.grid a.tile:hover{transform:translateY(-3px);border-color:var(--brand)}
.grid .tile h3{margin-bottom:6px}
.grid .tile p{margin:0;color:var(--muted);font-size:14.5px}
.hero{background:linear-gradient(135deg,#0c1230,#15206b 60%,#2441e7 130%);color:#d6dcff;padding:44px 0}
.hero h1{color:#fff;font-size:34px;max-width:760px}
.hero p{max-width:720px;color:#c7cff7;margin:0}
.hero .row{margin-top:20px}
.tag{display:inline-block;background:#1d2760;color:#c9d2ff;border-radius:999px;padding:4px 12px;font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;margin-bottom:12px}

/* footer */
.site-foot{background:#0c1230;color:#aab3e0;padding:28px 0;font-size:14.5px}
.site-foot a{color:#fff}
.site-foot .wrap{display:flex;gap:18px;flex-wrap:wrap;align-items:center;justify-content:space-between}

@media (max-width:860px){.page{grid-template-columns:1fr}.side{order:2}}
.table-wrap{overflow-x:auto;margin-top:18px;border-radius:10px}
.table-wrap table{min-width:720px}