:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-2: #eef3fb;
  --text: #183153;
  --muted: #5f6f85;
  --primary: #175cd3;
  --primary-2: #0f4ab8;
  --accent: #12b76a;
  --border: #d8e2f0;
  --shadow: 0 10px 30px rgba(15, 35, 95, 0.08);
  --radius: 18px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: linear-gradient(180deg, #edf3fb 0%, #f7f9fc 100%);
  color: var(--text);
  font-family: 'Inter', Arial, sans-serif;
}
a { color: var(--primary); }
a:hover, a:focus { color: var(--primary-2); text-decoration: none; }
.site-shell { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.site-header-wrap { padding-top: 18px; }
.card-surface, #header, #body_block, .container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
#header {
  width: 100%;
  min-height: 96px;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-brand {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.site-tagline { color: var(--muted); margin-top: 4px; }
.site-header__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.lang-switcher { display: flex; gap: 10px; font-size: 13px; }
.lang-switcher a { padding: 6px 10px; border-radius: 999px; background: var(--surface-2); }
.profile-chip {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 999px; background: var(--surface-2);
}
.auth-links { display: flex; gap: 8px; }
.site-nav.navbar { margin: 16px auto 0; border: 0; border-radius: 16px; background: #0e2a47; box-shadow: var(--shadow); }
.site-nav .navbar-brand, .site-nav .navbar-nav > li > a { color: #fff !important; }
.site-nav .navbar-nav > li.active > a,
.site-nav .navbar-nav > li > a:hover,
.site-nav .navbar-nav > li > a:focus,
.site-nav .navbar-brand:hover { background: rgba(255,255,255,0.08) !important; }
.site-nav .dropdown-menu { border-radius: 12px; overflow: hidden; }
#body_block {
  width: 100%;
  min-height: calc(100vh - 180px);
  padding: 22px;
  margin: 16px auto 24px;
}
.page-header-block { margin-bottom: 18px; }
.page-title { margin: 0 0 6px; font-size: 28px; font-weight: 700; }
.page-subtitle { margin: 0; color: var(--muted); }
.portal-toolbar { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; align-items: center; }
.portal-toolbar .form-control { max-width: 320px; }
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.resource-card, .video_block, .articles_ss, .links_block {
  width: 100% !important;
  height: auto !important;
  min-height: 220px;
  margin: 0;
  padding: 18px;
  float: none;
  overflow: hidden;
  background: linear-gradient(180deg, #fff 0%, #f8fbff 100%);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}
.resource-card h3, .resource-card h4, .video_block h4, .articles_ss h4, .links_block h4 { margin-top: 0; font-size: 18px; font-weight: 700; }
.resource-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.resource-list li a,
.video_block a,
.articles_ss a,
.links_block a { display: inline-block; line-height: 1.45; }
#accordion > h3 {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  background: var(--surface-2);
  font-weight: 700;
}
#accordion > div {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 14px;
  background: #fff;
}
.topic-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}
.topic-card h4 { margin-top: 0; }
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.stat-card {
  background: linear-gradient(135deg, #0f4ab8, #175cd3);
  color: #fff;
  border-radius: 18px;
  padding: 18px;
  box-shadow: var(--shadow);
}
.stat-card__label { opacity: 0.85; font-size: 13px; }
.stat-card__value { font-size: 28px; font-weight: 700; margin-top: 6px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 20px;
  align-items: stretch;
}
.hero-card { padding: 22px; border-radius: 18px; background: linear-gradient(135deg, #0d2440, #175cd3); color: #fff; box-shadow: var(--shadow); }
.hero-card h2 { margin-top: 0; font-size: 32px; }
.hero-card p { opacity: 0.92; }
.quick-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.quick-link {
  display: block; padding: 14px 16px; border-radius: 14px;
  background: #fff; border: 1px solid var(--border); box-shadow: var(--shadow);
  color: var(--text);
}
.quick-link strong { display: block; margin-bottom: 4px; }
.quick-link span { color: var(--muted); font-size: 13px; }
.carousel,
.carousel-inner,
.carousel-inner > .item > img {
  border-radius: 18px;
}
.carousel-inner { height: 420px; }
.carousel-inner > .item > img { width: 100%; height: 420px; object-fit: cover; }
.auth-page {
  max-width: 460px; margin: 48px auto; padding: 24px;
  background: #fff; border-radius: 20px; border: 1px solid var(--border); box-shadow: var(--shadow);
}
.auth-page .form-control { height: 44px; }
.auth-page__title { margin: 0 0 6px; font-size: 28px; font-weight: 700; }
.auth-page__subtitle { margin: 0 0 18px; color: var(--muted); }
.site-footer { padding: 0 0 24px; }
.site-footer__inner {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 14px 18px; color: var(--muted);
}
#test_block { background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); padding: 24px !important; }
#test_line_hor, #test_line_bot { background: #d92d20 !important; color: transparent !important; }
#test_line_ver { background-color: #d92d20 !important; }
.test-topbar {
  position: sticky; top: 10px; z-index: 10; display: flex; justify-content: space-between; gap: 12px;
  margin-bottom: 16px; padding: 12px 16px; border-radius: 14px; background: var(--surface-2); border: 1px solid var(--border);
}
.olympiad-card {
  background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow);
  padding: 18px; margin-bottom: 16px;
}
.olympiad-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px; margin: 14px 0; }
.badge-soft { display: inline-block; padding: 6px 10px; border-radius: 999px; background: #ecfdf3; color: #027a48; font-weight: 600; }
.table-responsive-card { overflow-x: auto; background: #fff; border: 1px solid var(--border); border-radius: 18px; box-shadow: var(--shadow); padding: 16px; }
@media (max-width: 992px) {
  .hero-grid { grid-template-columns: 1fr; }
  .quick-links { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  #header { padding: 18px; }
  .site-brand { font-size: 26px; }
  #body_block { padding: 16px; }
  .quick-links { grid-template-columns: 1fr; }
  .carousel-inner, .carousel-inner > .item > img { height: 260px; }
  .profile-chip { width: 100%; justify-content: space-between; }
  .auth-page { margin: 24px 12px; }
}