/* Страницы задач и номеров для поисковиков (platform/seo_pages.js): фон сайта, белая «бумага» для чтения */
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; padding: 16px 12px 70px; color: #2d3436; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6; background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #6c5ce7 100%) fixed; }
.wrap { max-width: 820px; margin: 0 auto; }
.crumbs { color: #dfe6e9; font-size: 14px; margin: 4px 4px 12px; }
.crumbs a, footer a { color: #ffeaa7; }
.card { background: #fff; border-radius: 18px; padding: 22px; margin-bottom: 14px; box-shadow: 0 10px 30px rgba(0,0,0,.2); overflow-wrap: break-word; }
h1 { font-size: 22px; line-height: 1.3; margin: 0 0 8px; }
h2 { font-size: 18px; margin: 22px 0 8px; }
h2 small { font-weight: 400; color: #636e72; }
.meta { font-size: 14px; color: #636e72; margin-bottom: 14px; }
.q, .sol { font-size: 17px; overflow-x: auto; }
.q img, .sol img { max-width: 100%; height: auto; }
.q table, .sol table { border-collapse: collapse; max-width: 100%; }
.btn { display: inline-block; margin: 14px 0 4px; padding: 11px 20px; border-radius: 12px; font-weight: 700; color: #fff; text-decoration: none;
    background: linear-gradient(135deg, #00b894, #00cec9); }
details { margin-top: 14px; border-top: 1px solid #dfe6e9; padding-top: 12px; }
summary { cursor: pointer; font-weight: 700; color: #2a5298; font-size: 17px; }
.ans { margin: 14px 0 4px; padding: 10px 14px; border-radius: 12px; background: #e8f8f2; font-size: 18px; }
.more { display: flex; flex-wrap: wrap; gap: 8px; justify-content: space-between; margin-bottom: 14px; }
.more a { color: #fff; padding: 8px 14px; border-radius: 12px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.3); text-decoration: none; font-size: 15px; }
.cta { font-size: 16px; }
.list { padding-left: 20px; margin: 6px 0; }
.list li { margin: 7px 0; }
.list a { color: #2a5298; text-decoration: none; }
.list a:hover { text-decoration: underline; }
.list.nums { list-style: none; padding: 0; }
.list.nums li { padding: 9px 0; border-bottom: 1px solid #eef0f3; }
footer { text-align: center; font-size: 14px; color: #dfe6e9; margin-top: 18px; }