:root {
  --color-white: #eeeeee;
  --color-black: #000000; }

* {
  margin: 0;
  padding: 0;
  color: var(--color-white);
  box-sizing: border-box; }

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
  font-style: italic;
  background-repeat: no-repeat;
  background-size: cover;
  shape-margin: 0.75rem; }

ul {
  list-style: none; }

.main-area {
  background-color: var(--color-black);
  padding-top: 45px; }
  .main-area > * + * {
    padding-bottom: 100px; }

.inner {
  width: 80%;
  margin: 0 auto; }

.site-header {
  background-color: #fff;
  display: flex;
  align-items: center;
  position: fixed;
  z-index: 100;
  width: 100%;
  height: 45px; }
  .site-header .header-inner {
    width: 90%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between; }
    .site-header .header-inner .xiroku-logo {
      width: 80px; }
  .site-header ul {
    display: flex;
    font-size: 12px;
    font-weight: bold; }
    .site-header ul .site-link {
      margin-right: 40px; }
      .site-header ul .site-link:last-child {
        margin-right: 0; }
      .site-header ul .site-link li {
        color: var(--color-black); }
        .site-header ul .site-link li span {
          color: var(--color-black);
          margin-right: 5px; }

.page-title {
  margin-bottom: 100px; }
  .page-title .title {
    width: 100%;
    position: relative;
    max-height: 200px;
    overflow: hidden; }
  .page-title img {
    width: 100%; }
  .page-title h1 {
    color: var(--color-black);
    font-size: 48px;
    font-weight: bold;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    width: 100%;
    text-align: center; }

.section-title {
  font-size: 36px;
  text-align: center;
  margin-bottom: 55px; }
  .section-title.small {
    font-size: 24px;
    text-align: left;
    margin-bottom: 15px; }

.proportion .container {
  width: 700px;
  margin: 0 auto; }

.case-study ul > * + * {
  margin-top: 15px; }
.case-study ul li {
  height: 330px;
  display: flex;
  align-items: center;
  border: 1px solid var(--color-white); }
  .case-study ul li .text-box, .case-study ul li .img-box {
    width: 50%;
    height: inherit; }
  .case-study ul li .text-box {
    height: auto;
    font-weight: 600; }
    .case-study ul li .text-box .wrapper {
      width: 90%;
      margin: 0 auto; }
      .case-study ul li .text-box .wrapper .title {
        font-size: 24px;
        text-align: center;
        margin-bottom: 15px; }
  .case-study ul li .img-box {
    border-left: 1px solid var(--color-white); }
    .case-study ul li .img-box img {
      width: 100%;
      height: inherit;
      object-fit: cover; }

.other-case-study .wrapper {
  display: grid;
  grid-template-columns: 45% 10% 45%; }
  .other-case-study .wrapper .center-line {
    content: "";
    width: 1px;
    height: 100%;
    background-color: var(--color-white);
    margin: 0 auto; }
  .other-case-study .wrapper ul > * + * {
    margin-top: 20px; }
  .other-case-study .wrapper ul .title {
    font-weight: bold;
    margin-bottom: 5px; }
