:root {
  --course-blue: #135ca8;
  --course-blue-dark: #073a72;
  --course-ink: #172a40;
  --course-muted: #66788d;
  --course-border: #dce6f0;
  --course-soft: #f3f7fb;
  --course-width: 1180px;
}

body.course-page {
  margin: 0;
  background: var(--course-soft);
  color: var(--course-ink);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

.course-page *,
.course-page *::before,
.course-page *::after {
  box-sizing: border-box;
}

.course-page a {
  color: inherit;
  text-decoration: none;
}

.course-page #container.course-shell {
  width: 100%;
  max-width: none;
  margin: 0;
  overflow: visible;
  background: var(--course-soft);
}

.course-width {
  width: min(var(--course-width), calc(100% - 48px));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.course-hero {
  position: relative;
  min-height: 300px;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
  background: linear-gradient(90deg, #0A315A 0%, #0B345E 25%, #123E68 42%, #315978 58%, #6B8295 100%);
}

.course-hero::before {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(
      90deg,
      #0A315A 0%,
      #0A315A calc(100% - 760px),
      rgba(10, 49, 90, 0.96) calc(100% - 700px),
      rgba(10, 49, 90, 0.78) calc(100% - 620px),
      rgba(10, 49, 90, 0.52) calc(100% - 540px),
      rgba(10, 49, 90, 0.25) calc(100% - 450px),
      rgba(10, 49, 90, 0) calc(100% - 360px)
    ) 0 0 / 100% 100% no-repeat,
    linear-gradient(rgba(10, 55, 110, 0.18), rgba(10, 55, 110, 0.18)) 0 0 / 100% 100% no-repeat,
    url("../img/banners/course-hero-desktop.webp") right center / auto 110% no-repeat;
  content: "";
}

.course-hero__content {
  position: relative;
  z-index: 1;
  padding-block: 66px;
}

.course-hero__content > p,
.course-section-label {
  margin: 0 0 8px;
  color: #bfe1ff;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.course-hero h1 {
  margin: 0;
  font-size: clamp(36px, 5vw, 54px);
  font-weight: 800;
  line-height: 1.2;
}

.course-hero h1::before {
  content: "";
  width: 52px;
  height: 3px;
  display: block;
  margin-bottom: 16px;
  background: #fff;
}

.course-breadcrumb {
  border-bottom: 1px solid var(--course-border);
  background: #fff;
  color: var(--course-muted);
  font-size: 14px;
}

.course-breadcrumb > div {
  min-height: 60px;
  display: flex;
  align-items: center;
  gap: 10px;
  overflow: hidden;
}

.course-breadcrumb a,
.course-breadcrumb span[aria-hidden="true"] {
  flex: 0 0 auto;
  white-space: nowrap;
}

.course-breadcrumb span:last-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-breadcrumb a:hover {
  color: var(--course-blue);
}

.course-introduction {
  padding-block: 54px;
  border-bottom: 1px solid var(--course-border);
  background: #fff;
}

.course-introduction__inner {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.55fr);
  gap: 64px;
  align-items: center;
}

.course-introduction .course-section-label,
.course-result-heading .course-section-label,
.course-error .course-section-label {
  color: var(--course-blue);
}

.course-introduction h2,
.course-result-heading h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.35;
}

.course-introduction__inner > p {
  margin: 0;
  color: #53677d;
  font-size: 16px;
}

.course-catalog {
  min-height: 520px;
  padding-block: 54px 78px;
}

.course-tools {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 44px;
}

.course-categories {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.course-categories a {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border: 1px solid #cad7e4;
  border-radius: 3px;
  background: #fff;
  color: #30475f;
  font-size: 14px;
  font-weight: 700;
  transition: 0.2s ease;
}

.course-categories a:hover,
.course-categories a.active {
  border-color: var(--course-blue);
  background: var(--course-blue);
  color: #fff;
}

.course-search {
  flex: 0 0 310px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
}

.course-search input,
.course-search button {
  height: 44px;
  border: 1px solid #bdcbd9;
  font: inherit;
}

.course-search input {
  min-width: 0;
  padding: 0 14px;
  border-radius: 3px 0 0 3px;
  background: #fff;
  color: var(--course-ink);
}

.course-search button {
  padding-inline: 20px;
  border-color: var(--course-blue);
  border-radius: 0 3px 3px 0;
  background: var(--course-blue);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.course-search input:focus,
.course-search button:focus-visible,
.course-categories a:focus-visible,
.course-card a:focus-visible,
.course-pagination a:focus-visible {
  outline: 3px solid rgba(19, 92, 168, 0.25);
  outline-offset: 2px;
}

.course-result-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 26px;
}

.course-result-heading > p {
  margin: 0 0 4px;
  color: var(--course-muted);
  font-size: 14px;
}

.course-result-heading strong {
  color: var(--course-blue);
  font-size: 18px;
}

.course-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px 20px;
}

.course-card {
  position: relative;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid #dbe5ef;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 10px 28px rgba(27, 67, 105, 0.06);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.course-card:hover {
  transform: translateY(-3px);
  border-color: #a9c6df;
  box-shadow: 0 16px 34px rgba(25, 65, 104, 0.11);
}

.course-card__cover {
  aspect-ratio: 3 / 2;
  display: block;
  overflow: hidden;
  background: #dce8f3;
}

.course-card__cover img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.course-card:hover .course-card__cover img {
  transform: scale(1.035);
}

.course-card__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 20px;
}

.course-card__category {
  align-self: flex-start;
  margin-bottom: 10px;
  padding: 3px 9px;
  border-radius: 2px;
  background: #eaf3fb;
  color: #0d5a9f;
  font-size: 12px;
  font-weight: 750;
}

.course-card h2 {
  min-height: 3.05em;
  margin: 0 0 16px;
  color: var(--course-ink);
  font-size: 17px;
  font-weight: 750;
  line-height: 1.52;
}

.course-card h2 a {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.course-card h2 a::after {
  content: "";
  position: absolute;
  inset: 0;
}

.course-card__facts {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 14px 0;
  border-top: 1px solid #e6edf4;
  color: var(--course-muted);
  font-size: 13px;
}

.course-card__facts div {
  min-width: 0;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 8px;
}

.course-card__facts dt,
.course-card__facts dd {
  margin: 0;
}

.course-card__facts dt {
  color: #8291a2;
}

.course-card__facts dd {
  overflow-wrap: anywhere;
  color: #425970;
}

.course-card__more {
  margin-top: auto;
  padding-top: 2px;
  color: var(--course-blue);
  font-size: 13px;
  font-weight: 750;
}

.course-card__more b {
  margin-left: 4px;
}

.course-pagination {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 48px;
}

.course-pagination a,
.course-pagination span {
  min-width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding-inline: 10px;
  border: 1px solid #cad7e4;
  border-radius: 3px;
  background: #fff;
  color: #385069;
  font-weight: 700;
}

.course-pagination a:hover,
.course-pagination .active {
  border-color: var(--course-blue);
  background: var(--course-blue);
  color: #fff;
}

.course-pagination .course-pagination__direction {
  min-width: 78px;
}

.course-pagination .disabled {
  opacity: 0.45;
}

.course-pagination .course-pagination__ellipsis {
  min-width: 28px;
  padding: 0;
  border-color: transparent;
  background: transparent;
}

.course-empty,
.course-error .course-width {
  padding: 64px 28px;
  border: 1px solid var(--course-border);
  background: #fff;
  text-align: center;
}

.course-empty h2,
.course-error h1 {
  margin: 0 0 10px;
  font-size: clamp(25px, 4vw, 38px);
}

.course-empty p,
.course-error p {
  margin: 0 0 24px;
  color: var(--course-muted);
}

.course-empty a,
.course-error a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding: 9px 20px;
  border-radius: 3px;
  background: var(--course-blue);
  color: #fff;
  font-weight: 700;
}

.course-error {
  min-height: 570px;
  padding-block: 90px;
}

@media (max-width: 1040px) {
  .course-tools {
    display: grid;
  }

  .course-search {
    width: min(100%, 430px);
    flex-basis: auto;
  }

  .course-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .course-width {
    width: min(var(--course-width), calc(100% - 28px));
  }

  .course-hero {
    min-height: 230px;
    background: #135ca8;
  }

  .course-hero::before {
    inset: 0;
    background:
      linear-gradient(rgba(10, 55, 110, 0.24), rgba(10, 55, 110, 0.24)),
      url("../img/banners/course-hero.jpg") center / cover no-repeat;
    -webkit-mask-image: none;
    mask-image: none;
  }

  .course-hero__content {
    padding-block: 48px;
  }

  .course-hero h1 {
    font-size: 34px;
  }

  .course-breadcrumb > div {
    min-height: 52px;
  }

  .course-introduction {
    padding-block: 38px;
  }

  .course-introduction__inner {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .course-introduction h2,
  .course-result-heading h2 {
    font-size: 24px;
  }

  .course-introduction__inner > p {
    font-size: 14px;
  }

  .course-catalog {
    padding-block: 36px 56px;
  }

  .course-tools {
    gap: 18px;
    margin-bottom: 34px;
  }

  .course-categories {
    flex-wrap: nowrap;
    margin-inline: -14px;
    padding-inline: 14px;
    overflow-x: auto;
    scrollbar-width: thin;
  }

  .course-categories a {
    min-height: 40px;
    flex: 0 0 auto;
    padding-inline: 15px;
  }

  .course-search {
    width: 100%;
  }

  .course-result-heading {
    display: block;
    margin-bottom: 20px;
  }

  .course-result-heading > p {
    margin-top: 8px;
  }

  .course-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px 10px;
  }

  .course-card {
    border-radius: 4px;
  }

  .course-card__body {
    padding: 11px;
  }

  .course-card__category {
    max-width: 100%;
    margin-bottom: 7px;
    padding: 2px 6px;
    overflow: hidden;
    font-size: 10px;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .course-card h2 {
    min-height: 3em;
    margin-bottom: 10px;
    font-size: 14px;
    line-height: 1.5;
  }

  .course-card__facts {
    gap: 5px;
    padding: 9px 0;
    font-size: 11px;
  }

  .course-card__facts div {
    grid-template-columns: 29px minmax(0, 1fr);
    gap: 3px;
  }

  .course-card__more {
    font-size: 11px;
  }

  .course-pagination {
    gap: 5px;
    margin-top: 36px;
  }

  .course-pagination a,
  .course-pagination span {
    min-width: 38px;
    height: 38px;
    padding-inline: 7px;
    font-size: 13px;
  }

  .course-pagination .course-pagination__direction {
    min-width: 62px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .course-card,
  .course-card__cover img,
  .course-categories a {
    transition: none;
  }
}