* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f4f7f2;
  color: #1f2933;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

a {
  color: #0f766e;
}

a:hover {
  color: #134e4a;
}

.site-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.page-header,
.page-footer {
  background: #ffffff;
  border: 1px solid #d8d6cc;
  border-radius: 8px;
  padding: 18px 22px;
}

.course-index {
  padding-bottom: 36px;
}

.page-header {
  margin-bottom: 20px;
}

.page-footer {
  margin-top: 24px;
}

.course-title,
.page-title {
  margin: 0 0 14px;
  line-height: 1.2;
}

.page-title {
  font-size: 1.7rem;
}

.course-title {
  max-width: 760px;
  color: #12343b;
  font-size: clamp(2rem, 5vw, 3.3rem);
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(170px, 260px);
  gap: clamp(18px, 4vw, 36px);
  align-items: center;
  border: 1px solid #bedcc8;
  border-radius: 8px;
  background: #ffffff;
  padding: clamp(18px, 4vw, 34px);
  overflow: hidden;
}

.hero-copy {
  width: 100%;
}

.course-image {
  width: min(100%, 210px);
  aspect-ratio: 1 / 1;
  justify-self: end;
  border: 4px solid #ffffff;
  border-radius: 8px;
  box-shadow: 0 12px 32px rgba(18, 52, 59, 0.18);
  object-fit: cover;
}

.welcome-card {
  margin: 18px 0 0;
  border: 1px solid #d6e0d7;
  border-radius: 8px;
  background: #ffffff;
  padding: 18px 20px;
}

.welcome-card h2,
.course-note h2 {
  margin: 0 0 8px;
  color: #12343b;
  font-size: 1.3rem;
}

.welcome-card p,
.course-note p {
  margin: 0;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.page-nav a,
.page-nav span {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  border-radius: 6px;
  padding: 7px 10px;
}

.page-nav a {
  background: #0f766e;
  color: #ffffff;
  text-decoration: none;
}

.page-nav a:hover {
  background: #134e4a;
  color: #ffffff;
}

.page-nav span {
  color: #697586;
  background: #ece9df;
}

.canvas-content {
  overflow-x: auto;
}

.canvas-content div,
.canvas-content section,
.canvas-content article {
  max-width: 100% !important;
}

.canvas-content [style*="width"] {
  max-width: 100% !important;
}

.canvas-content p,
.canvas-content li,
.canvas-content td,
.canvas-content th,
.canvas-content span,
.canvas-content blockquote {
  overflow-wrap: break-word;
}

.canvas-content img,
.canvas-content video,
.canvas-content iframe {
  max-width: 100%;
}

.canvas-content img,
.canvas-content video {
  height: auto !important;
}

.canvas-content pre {
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

.canvas-content table {
  max-width: 100%;
}

.canvas-content td,
.canvas-content th {
  vertical-align: top;
}

.manual-instruction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 22px auto;
  max-width: 980px;
  text-align: left;
}

.manual-instruction-card {
  border: 1px solid #d8d6cc;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  padding: 16px;
}

.manual-instruction-card h3 {
  margin: 0 0 12px;
  border-radius: 6px;
  background: #ffc857;
  color: #12343b;
  padding: 10px 12px;
  text-align: center;
}

.manual-instruction-card p,
.manual-instruction-card li {
  font-size: 1.05rem;
}

.manual-video-link {
  margin: 24px 0;
  text-align: center;
}

.manual-video-link a {
  color: #ba372a;
  font-size: 1.2rem;
  font-weight: 700;
}

.index-list {
  display: block;
  margin: 12px 0 26px;
  padding-left: 1.6rem;
}

.index-list li {
  margin: 8px 0;
  padding-left: 4px;
}

.index-list a {
  display: block;
  min-height: 100%;
  border: 1px solid #d6e0d7;
  border-left: 5px solid #2a9d8f;
  border-radius: 8px;
  background: #ffffff;
  padding: 12px 14px;
  text-decoration: none;
}

.index-list a:hover {
  border-color: #0f766e;
  background: #f8fffb;
}

.module-title {
  margin: 34px 0 0;
  border-top: 2px solid #c7d7ca;
  padding-top: 22px;
  color: #12343b;
  font-size: 1.55rem;
}

.course-note + .module-title {
  margin-top: 28px;
}

.course-note {
  margin: 18px 0 0;
  border-radius: 8px;
  padding: 16px 18px;
}

.course-note {
  border: 2px solid #ffc857;
  border-left: 8px solid #ba372a;
  background: #fff8df;
  box-shadow: 0 10px 24px rgba(186, 55, 42, 0.12);
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 18px;
  }

  .page-header,
  .page-footer {
    padding: 14px;
  }

  .page-nav {
    align-items: stretch;
    flex-direction: column;
  }

  .page-nav a,
  .page-nav span {
    justify-content: center;
  }

  .home-hero {
    grid-template-columns: 1fr;
  }

  .course-image {
    justify-self: start;
    max-width: 180px;
  }

  .canvas-content {
    overflow-x: hidden;
  }

  .canvas-content div[style*="width"],
  .canvas-content section[style*="width"],
  .canvas-content article[style*="width"],
  .canvas-content table[style*="width"] {
    width: 100% !important;
  }

  .canvas-content [style*="padding: 0 30px"],
  .canvas-content [style*="padding: 0px 30px"],
  .canvas-content [style*="padding: 0 25px"] {
    padding-left: 12px !important;
    padding-right: 12px !important;
  }

  .canvas-content td,
  .canvas-content th {
    width: auto !important;
    height: auto !important;
    padding-left: 8px !important;
    padding-right: 8px !important;
  }

  .canvas-content iframe {
    width: 100% !important;
  }

  .manual-instruction-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .canvas-content [style*="font-size: 36pt"] {
    font-size: 20pt !important;
  }

  .canvas-content [style*="font-size: 24pt"] {
    font-size: 17pt !important;
  }

  .canvas-content [style*="font-size: 18pt"] {
    font-size: 15pt !important;
  }
}