* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f4f4f4;
  display: flex;
  flex-direction: column;
  align-items: center;
}

a {
  color: #0359b5;
}

span.highlight-text {
  background-color: #ffcece;
}

.navigate-top {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background-color: #4667a3;
  font-size: 2rem;
  text-decoration: none;
  border-radius: 10px;
  box-shadow: 0px 2px 7px #0000003b;
}

.header {
  background-color: #2d4b81;
  color: white;
  padding-top: 1.5rem;
  padding-bottom: 1.25rem;
  text-align: center;
  width: 100%;
}

.header-title-1 {
  font-size: 2rem;
  line-height: 1;
  font-weight: 600;
}
.header-title-2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.content {
  display: flex;
  flex-direction: column;
  max-width: 750px;
  width: 100%;
  padding: 1rem 1.5rem;
}

.main-image-container {
  display: flex;
  flex-direction: row;
  justify-content: center;
}

.main-image {
  max-height: 60vh;
}

.main-image-tiny {
  max-height: 20vh;
  margin: 2vh 0;
}

.board-image-numbered {
  width: 100%;
}

.h-section {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
}

.h-sub-section {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
}

.h-section,
.h-sub-section {
  transition: all 1s ease-in-out;
}

.h-section-title-2 {
  font-size: 1.3rem;
  font-weight: bold;
  color: #717171;
  border-bottom: 2px solid #bec0c3;
  padding-bottom: 0.3rem;
  margin-bottom: 0.75rem;
}

.h-section-title-4 {
  font-size: 1.05rem;
  font-weight: bold;
  color: #636363;
  border-bottom: 1px solid #bec0c3;
  padding-bottom: 0.1rem;
  margin-bottom: 0.25rem;
}

.h-section-content {
  padding-top: 0.25rem;
  padding-bottom: 0.5rem;
}

.highlights-row {
  display: flex;
  flex-direction: row;
  padding-bottom: 5px;
  padding-left: 1rem;
}

.highlights-row-icon {
  font-size: 1rem;
}

.highlights-row-text {
  padding-left: 0.5rem;
  font-size: 1rem;
  color: #3b3b3b;
}

.chapters-ol {
  font-size: 1.1rem;
  line-height: 2rem;
}

.chapters-ol > li {
  font-size: 1.1rem;
}

.components-row {
  display: flex;
  flex-direction: row;
  padding-bottom: 5px;
  height: 1.6rem;
  align-items: center;
}

.components-row-number {
  font-size: 1.25rem;
  font-weight: bold;
  color: #dd5959;
  font-family: monospace;
  height: 1.65rem;
}

.components-row-text {
  padding-left: 0.25rem;
  font-size: 1rem;
  color: #3b3b3b;
  padding-top: 0.1rem;
}

.content-with-image-img {
  float: left;
  margin-right: 1rem;
  width: 7.5rem;
}

a.button-link-l {
  background-color: #4575cd;
  color: #fff;
  width: 100%;
  display: block;
  text-align: center;
  font-size: 1.2rem;
  text-decoration: none;
  padding: 0.3rem;
  border-radius: 0.3rem;
  font-weight: 500;
  margin: 2rem 0;
}

a.button-link-l.buy-now {
  background-color: #f59914;
  /* color: #000; */
}