:root {
  --brand: #0B5FFF;
  --ink: #14213d;
  --muted: #5c6475;
  --line: #e3e6ec;
  --bg: #f6f7fa;
  --card: #ffffff;
  --ok: #1a7f4b;
  --warn: #b25e00;
  --bad: #b3261e;
  --radius: 12px;
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
a { color: var(--brand); }
header.top { background: var(--card); border-bottom: 1px solid var(--line); }
header.top .wrap { display: flex; align-items: center; gap: 16px; padding: 12px 20px; max-width: 1080px; margin: 0 auto; }
.brand { font-weight: 700; text-decoration: none; color: var(--ink); display: flex; align-items: center; gap: 10px; }
.brand .dot { width: 14px; height: 14px; border-radius: 4px; background: var(--brand); }
.brand img { height: 50px; width: auto; display: block; }
.brand .client-name { font-size: .95rem; }
.login-logo { display: block; width: 100%; max-width: 360px; height: auto; margin: 0 auto 18px; }
nav { margin-left: auto; display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
nav a { text-decoration: none; color: var(--muted); }
nav form { margin: 0; }
main { max-width: 1080px; margin: 0 auto; padding: 28px 20px 60px; }
h1 { font-size: 1.7rem; margin: 0 0 6px; }
h2 { font-size: 1.2rem; margin: 28px 0 12px; }
.sub { color: var(--muted); margin: 0 0 24px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.lesson-card { display: flex; flex-direction: column; gap: 8px; }
.lesson-card h3 { margin: 0; font-size: 1.05rem; }
.lesson-card .meta { color: var(--muted); font-size: .9rem; }
.lesson-card .actions { margin-top: auto; }
.pill { display: inline-block; font-size: .78rem; padding: 2px 10px; border-radius: 999px; background: #eef1f6; color: var(--muted); }
.pill.ok { background: #e3f4ea; color: var(--ok); }
.pill.warn { background: #fff1de; color: var(--warn); }
.pill.bad { background: #fde7e6; color: var(--bad); }
.btn { display: inline-block; background: var(--brand); color: #fff; border: 0; border-radius: 8px; padding: 9px 16px; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn.secondary { background: transparent; color: var(--brand); border: 1px solid var(--brand); }
.btn.link { background: none; color: var(--muted); padding: 0; font-weight: 400; }
.progress { height: 10px; background: #e6e9ef; border-radius: 999px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--brand); }
.stats { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); margin-bottom: 8px; }
.stat .num { font-size: 1.8rem; font-weight: 700; }
.stat .label { color: var(--muted); font-size: .9rem; }
table { width: 100%; border-collapse: collapse; background: var(--card); }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .85rem; color: var(--muted); font-weight: 600; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
video { width: 100%; border-radius: var(--radius); background: #000; }
.video-placeholder { aspect-ratio: 16/9; border-radius: var(--radius); background: #e9ecf2; display: grid; place-items: center; color: var(--muted); text-align: center; padding: 20px; }
.points { white-space: pre-line; }
.question { margin: 0 0 18px; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.question legend { font-weight: 600; padding: 0 4px; }
.question label { display: flex; gap: 10px; align-items: flex-start; padding: 6px 0; cursor: pointer; }
.question.right { border-color: var(--ok); }
.question.wrong { border-color: var(--bad); }
.explain { margin-top: 8px; color: var(--muted); font-size: .95rem; }
.messages { list-style: none; padding: 0; margin: 0 0 20px; }
.messages li { padding: 10px 14px; border-radius: 8px; margin-bottom: 8px; background: #eef1f6; }
.messages .success { background: #e3f4ea; }
.messages .warning { background: #fff1de; }
.messages .error { background: #fde7e6; }
form p { margin: 0 0 14px; }
input[type=text], input[type=email], input[type=password], input[type=date], select, input[type=file] { width: 100%; max-width: 420px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; font: inherit; background: #fff; }
.helptext { display: block; color: var(--muted); font-size: .85rem; }
.errorlist { color: var(--bad); padding-left: 18px; margin: 4px 0; }
.login { max-width: 420px; margin: 40px auto; }
footer { text-align: center; color: var(--muted); font-size: .85rem; padding: 24px; }
@media (max-width: 600px) {
  header.top .wrap { flex-wrap: wrap; }
  nav { margin-left: 0; }
}