html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  vertical-align: baseline;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  scroll-behavior: smooth;
}

/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
  display: block;
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

li {
  list-style-type: none;
}

blockquote,
q {
  quotes: none;
}

blockquote:before,
blockquote:after,
q:before,
q:after {
  content: "";
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

button {
  background-color: transparent;
  border: none;
  cursor: pointer;
  outline: none;
  padding: 0;
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
}

html {
  font-family: "Noto Sans JP", sans-serif;
  font-size: 62.5%;
  letter-spacing: 0.05em;
}

p {
  font-size: 16px;
  line-height: 2;
  letter-spacing: 0.05em;
}

.single-page {
  padding-top: 90px;
  padding-bottom: 100px;
  min-height: 100vh;
}
.single-page .single-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

.single-article {
  border-radius: 24px;
  overflow: hidden;
  margin-bottom: 60px;
}
.single-article .article-header {
  padding: 80px 80px 50px;
}
.single-article .article-header .article-meta {
  margin-bottom: 32px;
}
.single-article .article-header .article-meta .article-date {
  color: #001733;
  font-size: 14px;
  font-weight: 600;
}
.single-article .article-header .article-title {
  font-size: 32px;
  font-weight: 800;
  color: #33302B;
  line-height: 1.3;
  margin: 0 0 40px 0;
  letter-spacing: -0.02em;
}
.single-article .article-header .article-excerpt {
  font-size: 20px;
  color: #4a5568;
  line-height: 1.6;
  margin: 0;
  padding: 24px;
  background: rgba(255, 255, 255, 0.8);
  border-left: 4px solid #001733;
  border-radius: 0 12px 12px 0;
  -webkit-backdrop-filter: blur(10px);
          backdrop-filter: blur(10px);
  -webkit-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
          box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.single-article .article-header .article-featured-image {
  border-radius: 4px;
  overflow: hidden;
}
.single-article .article-header .article-featured-image img {
  width: 100%;
  height: auto;
  display: block;
  -webkit-transition: -webkit-transform 0.3s ease;
  transition: -webkit-transform 0.3s ease;
  transition: transform 0.3s ease;
  transition: transform 0.3s ease, -webkit-transform 0.3s ease;
}
.single-article .article-content {
  padding: 30px 80px;
  line-height: 1.8;
}
.single-article .article-content h2 {
  font-size: 28px;
  font-weight: 700;
  color: #33302B;
  margin: 50px 0 24px 0;
  padding-bottom: 16px;
  border-bottom: 3px solid #001733;
  position: relative;
  letter-spacing: -0.01em;
}
.single-article .article-content h2::before {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 40px;
  height: 3px;
  background: -webkit-gradient(linear, left top, right top, from(#001733), to(#004599));
  background: linear-gradient(90deg, #001733 0%, #004599 100%);
  border-radius: 2px;
}
.single-article .article-content h3 {
  font-size: 22px;
  font-weight: 600;
  color: #33302B;
  margin: 40px 0 20px 0;
  letter-spacing: -0.01em;
}
.single-article .article-content p {
  font-size: 17px;
  color: #2d3748;
  margin: 0 0 24px 0;
  line-height: 1.7;
}
.single-article .article-content ul, .single-article .article-content ol {
  margin: 24px 0;
  padding-left: 24px;
}
.single-article .article-content ul li, .single-article .article-content ol li {
  font-size: 17px;
  color: #2d3748;
  margin-bottom: 12px;
  line-height: 1.6;
}
.single-article .article-content blockquote {
  background: linear-gradient(135deg, rgba(0, 23, 51, 0.05) 0%, rgba(0, 23, 51, 0.08) 100%);
  border-left: 4px solid #001733;
  padding: 24px;
  margin: 40px 0;
  border-radius: 0 12px 12px 0;
  -webkit-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
          box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.single-article .article-content blockquote p {
  margin: 0;
  font-style: italic;
  color: #4a5568;
  font-size: 18px;
}
.single-article .article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 32px 0;
  -webkit-box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
          box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  -webkit-transition: -webkit-transform 0.3s ease;
  transition: -webkit-transform 0.3s ease;
  transition: transform 0.3s ease;
  transition: transform 0.3s ease, -webkit-transform 0.3s ease;
}
.single-article .article-content img:hover {
  -webkit-transform: scale(1.02);
          transform: scale(1.02);
}
.single-article .article-content a {
  color: #001733;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  -webkit-transition: all 0.3s ease;
  transition: all 0.3s ease;
  font-weight: 500;
}
.single-article .article-content a:hover {
  color: black;
  border-bottom-color: #001733;
}

.back-button-wrapper {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  margin-bottom: 80px;
}
@media (max-width: 960px) {
  .single-page {
    padding-top: 100px;
    padding-bottom: 60px;
  }
  .single-page .single-inner {
    padding: 0 16px;
  }
  .single-article {
    margin-bottom: 40px;
    border-radius: 20px;
  }
  .single-article .article-header {
    padding: 60px 40px 40px;
  }
  .single-article .article-header .article-title {
    font-size: 28px;
  }
  .single-article .article-header .article-excerpt {
    font-size: 18px;
    padding: 20px;
  }
  .single-article .article-header .article-featured-image {
    margin: 20px 0;
    border-radius: 8px;
  }
  .single-article .article-content {
    padding: 40px;
  }
  .single-article .article-content h2 {
    font-size: 24px;
  }
  .single-article .article-content h3 {
    font-size: 20px;
  }
  .single-article .article-content p {
    font-size: 16px;
  }
  .back-button-wrapper {
    margin-bottom: 60px;
  }
}
@media (max-width: 480px) {
  .single-page {
    padding-top: 80px;
    padding-bottom: 40px;
  }
  .single-page .single-inner {
    padding: 0;
  }
  .single-article {
    border-radius: 16px;
  }
  .single-article .article-header {
    padding: 40px 20px 30px;
  }
  .single-article .article-header .article-title {
    font-size: 24px;
  }
  .single-article .article-header .article-excerpt {
    font-size: 16px;
    padding: 16px;
  }
  .single-article .article-header .article-featured-image {
    margin: 16px 0;
    border-radius: 6px;
  }
  .single-article .article-content {
    padding: 20px;
  }
  .single-article .article-content h2 {
    font-size: 20px;
  }
  .single-article .article-content h3 {
    font-size: 18px;
  }
  .single-article .article-content p {
    font-size: 15px;
  }
  .back-button-wrapper {
    margin-bottom: 40px;
  }
}