:root {
  --ink: #17202a;
  --muted: #5e6a75;
  --line: #d9e1e8;
  --panel: #f4f7f9;
  --accent: #0f766e;
  --accent-dark: #0a5d55;
  --ok: #e4f6ee;
  --bad: #fff1f1;
  --white: #fff;
  --shadow: 0 14px 36px rgba(27,42,55,.12);
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; color: var(--ink); background: #fff; line-height: 1.55; }
a { color: inherit; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.topbar { border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); position: sticky; top: 0; z-index: 10; }
.nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 700; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border: 2px solid var(--accent); color: var(--accent); font-weight: 800; }
.menu { display: flex; align-items: center; gap: 18px; font-size: 14px; color: #33404a; }
.menu a { text-decoration: none; }
.page { padding: 46px 0 72px; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 28px; align-items: start; }
.panel, .card { border: 1px solid var(--line); background: var(--white); box-shadow: var(--shadow); }
.panel { padding: 28px; }
.card { padding: 22px; }
h1 { font-size: clamp(32px, 4vw, 48px); line-height: 1.08; margin: 0 0 16px; }
h2 { font-size: 24px; line-height: 1.18; margin: 0 0 14px; }
h3 { font-size: 18px; margin: 0 0 8px; }
.lead { color: var(--muted); font-size: 18px; max-width: 780px; }
.muted { color: var(--muted); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }
.stat { border: 1px solid var(--line); background: var(--panel); padding: 18px; }
.stat strong { display: block; color: var(--accent); font-size: 28px; line-height: 1.1; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 12px 18px; border: 1px solid var(--accent); background: var(--accent); color: #fff; text-decoration: none; font-weight: 700; cursor: pointer; }
.btn:hover { background: var(--accent-dark); }
.btn.secondary { background: #fff; color: var(--accent); }
.btn.secondary:hover { background: #eef8f6; }
.btn.small { min-height: 38px; padding: 9px 14px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.form { display: grid; gap: 14px; }
.form label { display: grid; gap: 6px; font-weight: 700; }
.form input, .form textarea, .form select { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #bdc9d2; background: #fff; font: inherit; }
.form textarea { min-height: 120px; resize: vertical; }
.checkline { display: flex !important; grid-template-columns: auto 1fr; align-items: flex-start; gap: 10px !important; }
.checkline input { width: auto; min-height: auto; margin-top: 5px; }
.alert { border: 1px solid #efb4b4; background: #fff5f5; color: #8a1f1f; padding: 12px 14px; margin-bottom: 14px; }
.success { border-color: #a8d8c1; background: var(--ok); color: #135d3a; }
.section-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.section-head h2 { margin: 0; }
.attempts { width: 100%; border-collapse: collapse; margin-top: 16px; }
.attempts th, .attempts td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; vertical-align: top; }
.attempts th { color: var(--muted); font-size: 13px; }
.attempts a { color: var(--accent); font-weight: 800; text-decoration: none; }
.badge { display: inline-flex; align-items: center; min-height: 24px; padding: 3px 8px; background: var(--panel); border: 1px solid var(--line); font-size: 13px; }
.badge.ok { background: var(--ok); border-color: #add9c6; }
.badge.bad { background: var(--bad); border-color: #e8b7b7; }
.trainer-layout { display: grid; grid-template-columns: 300px minmax(0,1fr); gap: 22px; margin-top: 28px; }
.question-card { border: 1px solid var(--line); background: #fff; box-shadow: var(--shadow); }
.question-head { padding: 20px 22px; border-bottom: 1px solid var(--line); background: #fbfcfd; }
.question-meta { color: var(--muted); font-size: 14px; margin-bottom: 10px; }
.question-text { font-size: 22px; line-height: 1.28; font-weight: 800; }
.answers { display: grid; gap: 10px; padding: 22px; }
.answer { width: 100%; text-align: left; border: 1px solid var(--line); background: #fff; padding: 14px 16px; font: inherit; cursor: pointer; }
.answer:hover { border-color: var(--accent); }
.answer.selected { outline: 2px solid var(--accent); }
.answer.correct { background: var(--ok); border-color: #95d4c3; }
.answer.wrong { background: var(--bad); border-color: #e7b1b1; }
.explain { margin: 0 22px 22px; padding: 18px; border: 1px solid var(--line); background: var(--panel); }
.refs { margin: 10px 0 0; padding-left: 20px; color: #33404a; }
.answer-log { display: grid; gap: 14px; margin-top: 16px; }
.answer-row { border: 1px solid var(--line); padding: 16px; background: #fff; }
.answer-row.is-bad { border-color: rgba(185, 28, 28, .22); background: #fffafa; }
.answer-row-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.answer-row p { margin: 10px 0 0; color: var(--ink); }
.progress { height: 12px; background: var(--panel); border: 1px solid var(--line); overflow: hidden; }
.progress span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s ease; }
.side-note { font-size: 14px; color: var(--muted); margin-top: 12px; }
.split.wide { grid-template-columns: minmax(0, 1fr) 420px; }
.module-hero { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.module-list { display: grid; gap: 16px; margin-top: 24px; }
.module-card { display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; gap: 18px; align-items: center; border: 1px solid var(--line); padding: 20px; background: #fff; box-shadow: var(--shadow); }
.module-card.is-locked { opacity: .68; background: var(--panel); box-shadow: none; }
.module-number { width: 54px; height: 54px; display: grid; place-items: center; border: 2px solid var(--accent); color: var(--accent); font-size: 22px; font-weight: 800; }
.module-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; color: var(--muted); font-size: 14px; }
.module-action { min-width: 150px; text-align: right; }
.topic-list { padding-left: 22px; }
.topic-list li { margin: 8px 0; }
.message-layout { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 18px; }
.message-users, .message-thread { border: 1px solid var(--line); background: #fff; }
.message-users { padding: 16px; }
.message-users a { display: block; padding: 9px 10px; text-decoration: none; border-bottom: 1px solid var(--line); }
.message-users a:hover { background: var(--panel); }
.message-thread { padding: 20px; }
.message-list { display: grid; gap: 10px; max-height: 520px; overflow-y: auto; margin: 18px 0; padding: 4px; }
.message { max-width: 78%; padding: 12px 14px; border: 1px solid var(--line); background: var(--panel); }
.message.mine { justify-self: end; background: var(--ok); border-color: #add9c6; }
.message small { display: block; color: var(--muted); margin-top: 6px; }
.inline-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.inline-actions form { margin: 0; }
.legal-page section { margin-top: 20px; }
.legal-page h2 { margin-top: 28px; }
.acts-nav { display: grid; gap: 8px; padding-left: 20px; }
code { overflow-wrap: anywhere; }
@media (max-width: 900px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .menu { flex-wrap: wrap; justify-content: flex-start; }
  .split, .split.wide, .trainer-layout, .grid, .message-layout { grid-template-columns: 1fr; }
  .module-card { grid-template-columns: 54px minmax(0, 1fr); }
  .module-action { grid-column: 1 / -1; text-align: left; }
}
@media (max-width: 560px) {
  .container { width: min(100% - 20px, 1120px); }
  .menu { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 14px; width: 100%; }
  .page { padding: 34px 0 52px; }
  .panel, .card { padding: 18px; }
  .btn { width: 100%; }
  .section-head { align-items: flex-start; flex-direction: column; }
  .attempts { font-size: 14px; }
  .question-text { font-size: 18px; }
  .module-hero { flex-direction: column; }
  .module-card { grid-template-columns: 1fr; }
  .module-action { grid-column: auto; }
  .message { max-width: 94%; }
}