:root {
  --c: #0f6e8c;
  --c-dark: #0a5068;
  --bg: #f5f8fa;
  --text: #1d2730;
  --muted: #5d6b77;
  --line: #d9e2e8;
  --ok: #1e7e34;
  --err: #b42318;
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; color: var(--text); background: var(--bg); }
a { color: var(--c); }
.wrap { max-width: 920px; margin: 0 auto; padding: 0 16px; }
.top { background: #fff; border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 60px; gap: 12px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand span { color: var(--c); }
.top nav { display: flex; gap: 14px; align-items: center; }
.top nav a { text-decoration: none; }
main.wrap { padding-top: 24px; padding-bottom: 40px; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: .2em 0 .5em; }
h2 { font-size: 1.3rem; margin: 1.4em 0 .5em; }
h3 { font-size: 1.1rem; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 20px 22px; margin: 0 0 20px; }
.hero { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 28px 24px; margin-bottom: 24px; }
.hero p.lead { font-size: 1.1rem; color: var(--muted); }
.price { font-size: 1.6rem; font-weight: 700; color: var(--c); }
.btn { display: inline-block; background: var(--c); color: #fff; border: 0; border-radius: 8px; padding: 12px 22px; font-size: 1rem; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn:hover { background: var(--c-dark); }
.btn.small { padding: 7px 14px; font-size: .9rem; color: #fff; }
.btn.secondary { background: #fff; color: var(--c); border: 1px solid var(--c); }
.btn.paypal { background: #ffc439; color: #111; }
.btn.paypal:hover { background: #f2b600; }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
label { display: block; font-weight: 600; margin: 12px 0 4px; }
input[type=text], input[type=email], input[type=date], input[type=password], input[type=number], select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font: inherit; background: #fff;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--c); outline-offset: 1px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; }
.check input { margin-top: 5px; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 600px) { .row2 { grid-template-columns: 1fr; } h1 { font-size: 1.5rem; } }
.msg { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; }
.msg.ok { background: #e7f5ea; color: var(--ok); }
.msg.err { background: #fdecea; color: var(--err); }
.hint { background: #eef6f9; border-left: 4px solid var(--c); padding: 10px 14px; border-radius: 4px; }
ul.cols { columns: 2; }
@media (max-width: 600px) { ul.cols { columns: 1; } }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #f0f4f7; font-size: .9rem; }
.table-scroll { overflow-x: auto; }
.steps { display: flex; list-style: none; padding: 0; margin: 0 0 20px; gap: 6px; flex-wrap: wrap; counter-reset: s; }
.steps li { counter-increment: s; background: #e8eef2; color: var(--muted); padding: 6px 12px; border-radius: 20px; font-size: .9rem; }
.steps li::before { content: counter(s) ". "; }
.steps li.active { background: var(--c); color: #fff; }
.steps li.done { background: #d4ece0; color: var(--ok); }
.question { border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; margin: 0 0 14px; background: #fff; }
.question.wrong { border-color: var(--err); background: #fff8f7; }
.question p { margin: 0 0 8px; font-weight: 600; }
.question label { font-weight: 400; margin: 6px 0; display: flex; gap: 8px; align-items: flex-start; }
.question label input { margin-top: 5px; }
details.chapter { background: #fff; border: 1px solid var(--line); border-radius: 8px; margin: 0 0 12px; padding: 0 16px; }
details.chapter summary { cursor: pointer; font-weight: 700; padding: 12px 0; }
.foot { border-top: 1px solid var(--line); background: #fff; padding: 18px 0; font-size: .9rem; }
.foot .wrap { display: flex; gap: 18px; flex-wrap: wrap; }
.foot span { color: var(--muted); }
.admin-nav { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.admin-nav a { padding: 6px 12px; border: 1px solid var(--line); border-radius: 6px; background: #fff; text-decoration: none; }
.admin-nav a.on { background: var(--c); color: #fff; border-color: var(--c); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: .8rem; background: #e8eef2; }
.badge.paid, .badge.done, .badge.free { background: #d4ece0; color: var(--ok); }
.badge.open { background: #fff4d6; color: #8a5b00; }
.card > h2:first-child { margin-top: 0; }