/* 
構成イメージ

- container
  - overview-container
    - overview-title
    - overview-text
    - overview-sub-text
  - contents-container
    - content-container
      - content-title-container
        - content-title
      - content-title-number (content-title-containerと併用する)
      - content-text
      - content-sub-text
      - content-image
      - content-card-container (中身はcontent-containerと同様に構成する)
*/

:root {
  --font-size-heading-1: 22px;
  --font-size-body-1: 18px;
  --font-size-body-2: 16px;
  --font-size-body-3: 14px;
  --font-size-body-4: 12px;

  --main-color: #40be44;

  --background-color: #ffffff;
  --font-color: #1a1a1a;
  --title-color: var(--main-color);
  --icon-color: var(--main-color);
  --card-color: #fafafa;
}



html {
  line-height: 1.4;
  box-sizing: border-box;
  
  font-size: var(--font-size-body-3);
}

body {
  margin: 0;

  background-color: var(--background-color);
    font-family: Arial, sans-serif;
    color: var(--font-color);
}

*, *::before, *::after {
  box-sizing: inherit;
}

h1,
h2,
h3,
p {
  margin: 0;
  font-weight: normal;
}

a {
  color: inherit;
  text-decoration: underline;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
    
  margin-bottom: 10px;
  font-size: var(--font-size-body-3);
}
li {
  position: relative;
  margin: 0;
  padding: 0;
  padding-left: 1em;
}
li::before {
  content: "・";
  position: absolute;
  left: 0;
}



/* 全体の幅調整用 */
.container {
  display: flex;
  flex-direction: column;
  align-content: center;
  gap: 32px;  
  
  margin: 0 auto;
  padding: 0 16px;
  max-width: 800px;
  min-width: 300px;

}



/* 戻るボタン */
.back-link-container {
  margin-top: 12px;
  margin-bottom: 12px;

  font-size: var(--font-size-body-3);
  text-decoration: none;
}
.back-link {
  position: relative;

  padding-left: 20px;

  color: var(--font-color);
  font-size: var(--font-size-body-3);
  text-decoration: none;
}
.back-link::before {
  position: absolute;
  left: 0;

  width: 16px;
  height: 16px;
  
  content: "";
  background-image: url("/images/icon_back.png");
  background-position: center;
  background-size: contain;
}



/* container内の要素 */
.overview-container {
  display: flex;
  flex-direction: column;
  gap: 8px;

  border-radius: 8px;
  padding: 16px;

  background-color: var(--card-color);
}

.contents-container {
  counter-reset: step;

  display: flex;
  flex-direction: column;
  gap: 32px;
}

.content-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}



/* overview-container内の要素 */
.overview-title {
  font-size: var(--font-size-heading-1);
}

.overview-text {
  font-size: var(--font-size-body-3);
}

.overview-sub-text {
  font-size: var(--font-size-body-4);
}



/* content-container内の要素 */
.content-title-container {
  display: flex;
  flex-direction: row;
  align-items: center;
}
.content-title{
  font-size: var(--font-size-body-1);
}
.content-title-number {
  gap: 8px;
}
.content-title-number::before {
  --size: 24px;
  counter-increment: step;
  content: counter(step);

  display: flex;
  justify-content: center;
  align-items: center;

  width: var(--size);
  height: var(--size);
  border-radius: var(--size);

  font-size: var(--font-size-body-2);
  color: #ffffff;
  background-color: var(--icon-color);
}

.content-text {
  font-size: var(--font-size-body-2);
}

.content-sub-text {
  font-size: var(--font-size-body-4);
}

.content-image {
  display: flex;
  justify-content: center;

  width: 100%;
}
.content-image > img {
  max-width: 400px;
  width: 50%;
  height: auto;
}

.content-card-container {
  display: flex;
  flex-direction: column;
  gap: 8px;

  border-radius: 8px;
  padding: 24px 16px;
  background-color: var(--card-color);
}