:root{
  --bg:#E9ECE8; --surface:#F7F8F5; --ink:#1F252B; --muted:#5B636B; --line:#C9CEC9;
  --panel:#363C43; --panel-edge:#23282D; --legend-off:#8D959C;
  --amber:#E3A33A; --green:#3E9E4F; --red:#C43A2F; --white-lt:#F2F2EA; --focus:#2F6FB5;
  --display:"Barlow Condensed","Arial Narrow",Arial,sans-serif;
  --body:"Source Serif 4",Georgia,"Times New Roman",serif;
  box-sizing:border-box;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#1A1F24; --surface:#232930; --ink:#E6E8E4; --muted:#A3AAB0; --line:#3A4148;
  --panel:#2C3238; --panel-edge:#14181B; --legend-off:#6F777E; --focus:#7FB0E8;}}
*,*::before,*::after{box-sizing:inherit}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.6}
a{color:inherit} a:hover{text-decoration-thickness:2px}
.wrap{max-width:900px;margin:0 auto;padding:24px 18px 72px}
h1,h2,h3{font-family:var(--display);font-weight:700;line-height:1.08;letter-spacing:.01em}
h1{font-size:clamp(2.2rem,6.5vw,3.6rem);margin:0 0 10px}
h2{font-size:2rem;margin:0 0 10px}
h3{font-size:1.35rem;margin:26px 0 8px}
p,li{max-width:68ch}
.muted{color:var(--muted)}
button,input,select{font:inherit}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}

/* Top bar */
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 18px;max-width:900px;margin:0 auto}
.brand{font-family:var(--display);font-weight:700;font-size:1.25rem;text-decoration:none}
.brand small{display:block;font-weight:500;font-size:.85rem;color:var(--muted)}
.top nav{display:flex;gap:14px;align-items:center;font-family:var(--display);font-size:1.05rem}

/* Buttons */
.btn{display:inline-block;background:var(--panel);color:var(--white-lt);border:0;border-radius:4px;padding:11px 20px;
  font-family:var(--display);font-size:1.2rem;font-weight:600;cursor:pointer;text-decoration:none}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.btn.ghost{background:none;color:var(--ink);border:1px solid var(--line)}
.btn.small{font-size:1rem;padding:6px 12px}

/* Annunciator panel */
.panel{background:var(--panel);border:6px solid var(--panel-edge);border-radius:10px;padding:14px;
  display:grid;grid-template-columns:repeat(auto-fill,minmax(122px,1fr));gap:8px}
.cell{position:relative;min-height:70px;border:2px solid #1B1F23;border-radius:3px;background:#181C20;color:var(--legend-off);
  font-family:var(--display);font-weight:600;font-size:1.02rem;line-height:1.05;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;padding:6px 4px;cursor:pointer}
.cell:hover{filter:brightness(1.25)}
.cell small{display:block;font-size:.74rem;font-weight:500;margin-top:4px;opacity:.85}
.cell.done{background:#1E3A23;color:#B9F2C2;box-shadow:0 0 14px rgba(62,158,79,.55);border-color:#2D5A35}
.cell.warn{background:#4A3410;color:#FFD99A;box-shadow:0 0 14px rgba(227,163,58,.5);border-color:#6E4E17}
.cell.locked{cursor:not-allowed;opacity:.55}
.cell.cert{background:#F2F2EA;color:#1F252B;border-color:#BDBDB0}
.legend{display:flex;flex-wrap:wrap;gap:16px;margin:10px 2px 0;color:var(--muted);font-size:.9rem}
.legend span::before{content:"";display:inline-block;width:12px;height:12px;border-radius:2px;margin-right:6px;vertical-align:-1px;background:#181C20;border:1px solid #555}
.legend .lg::before{background:var(--green)} .legend .la::before{background:var(--amber)}

/* Sheets, forms */
.sheet{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:22px}
.sheet table{border-collapse:collapse;width:100%;font-size:.95rem;margin:10px 0 16px}
.tablewrap{overflow-x:auto}
td,th{border-bottom:1px solid var(--line);padding:7px 8px;text-align:left;vertical-align:top}
th{font-family:var(--display);font-size:1.05rem}
label{display:block;font-family:var(--display);font-size:1.05rem;margin:12px 0 4px}
input[type=text],input[type=email],input[type=password]{width:100%;max-width:420px;padding:9px 11px;border:1px solid var(--line);
  border-radius:4px;background:var(--bg);color:var(--ink)}
.msg{margin:12px 0;padding:10px 12px;border-radius:4px;border:1px solid var(--line);background:var(--bg)}
.msg.err{border-color:var(--red)} .msg.ok{border-color:var(--green)}
.bar{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}

/* Exam */
.q{border-top:1px solid var(--line);padding:16px 0}
.q .prompt{font-weight:600}
.opt{display:block;width:100%;text-align:left;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:4px;
  padding:9px 12px;margin:6px 0;font-family:var(--body);font-size:1rem;cursor:pointer}
.opt[aria-pressed="true"]{border:2px solid var(--ink);padding:8px 11px}
.opt.right{background:rgba(62,158,79,.18);border-color:var(--green)}
.opt.wrong{background:rgba(196,58,47,.15);border-color:var(--red)}
.why{font-size:.96rem;color:var(--muted);margin-top:6px}
.score{font-family:var(--display);font-size:1.8rem;margin:6px 0 12px}
.score.ok{color:var(--green)} .score.no{color:var(--red)}
.missed{border-left:4px solid var(--amber);padding-left:14px}
.ack{display:flex;gap:8px;align-items:flex-start;margin-top:8px;font-size:.96rem}
.ack input{margin-top:5px}

/* Flash card */
.card{border:1px solid var(--line);background:var(--bg);border-radius:6px;padding:22px;text-align:center;margin:14px 0}
.card .sys{color:var(--muted);font-family:var(--display);font-size:1.05rem}
.card .item{font-size:1.35rem;font-weight:600;margin:6px 0 14px}
.card .val{font-family:var(--display);font-size:1.7rem;min-height:2.2rem}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}

/* Landing */
.hero{padding:30px 0 10px}
.hero p.lead{font-size:1.2rem;max-width:58ch}
.steps{counter-reset:s;list-style:none;padding:0;display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.steps li{counter-increment:s;background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:16px}
.steps li::before{content:counter(s);font-family:var(--display);font-weight:700;font-size:2rem;display:block;line-height:1}
.price{display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.price .amt{font-family:var(--display);font-weight:700;font-size:3.4rem;line-height:1}
footer{margin-top:56px;padding-top:16px;border-top:1px solid var(--line);font-size:.9rem;color:var(--muted)}
.hidden{display:none!important}
@media print{.top,.panel,.bar,footer,button{display:none!important}}