@import url('https://fonts.googleapis.com/css2?family=Kaisei+Opti:wght@400;500;700&display=swap');


:root {
  --header-height: 70px;
  --page-bg: #f4f4f4;
  --text: #000000;
  --muted: #d8d8d8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--page-bg);
  font-family: 'Kaisei Opti', serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

img,
svg {
  display: block;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  width: 100%;
  height: var(--header-height);
  padding: 0 18px;
  color: #000000;
  background: #ffffff;
}

.brand {
    display: block;
    margin-right: 80px;
}

.brand img {
  width: 194px;
  height: 33px;
}

.nav {
    display: flex;
    align-items: flex-start;
    justify-content:flex-start;
    gap: clamp(1.75rem, 3.2vw, 4rem);
    
}

.nav a {
  color: #000000;
  font-size: 0.93rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.top {
  color: #000000;
  background: var(--page-bg);
}

.intro {
  padding: 3.1rem 1.5rem 3.6rem;
  text-align: center;
  background: #ffffff;
}

.intro p {
  margin: 0;
  color: #000000;
  font-size: clamp(1.1rem, 1.2vw, 1.55rem);
  font-weight: 700;
  line-height: 1.9;
  letter-spacing: 0.08em;
}

.articles {
    padding: 4.2rem 3.8vw 5rem;
    background: var(--page-bg);
    min-height: 60vh;
}

.section-heading {
    max-width: 820px;
    margin: 10px auto 3.2rem;
    text-align: center;
}

.section-heading h2 {
  margin: 0;
  color: #000000;
  font-size: clamp(2.1rem, 2.1vw, 2.9rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.18em;
}

.section-subtitle {
  margin: 1.2rem 0 2rem;
  font-size: 0.86rem;
  font-weight: 900;
  line-height: 1.6;
}

.section-copy p {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.7;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(2rem, 3.8vw, 4.8rem);
  max-width: 1900px;
  margin: 0 auto;
}

.articles-card {
  background: #ffffff;
}

.articles-image {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #d8d8d8;
}

.articles-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.articles-image span {
  position: absolute;
  right: 0;
  bottom: 0;
  padding: 0.25rem 0.45rem;
  color: #ffffff;
  background: rgba(0, 0, 0, 0.45);
  font-size: 0.75rem;
  font-weight: 800;
  line-height: 1;
}

.articles-body {
  min-height: 128px;
  padding: 1.05rem 1.1rem 1rem;
}

.articles-body h3 {
  margin: 0;
  color: #000000;
  font-size: 1rem;
  font-weight: 900;
  line-height: 1.55;
}

.articles-body time {
  display: block;
  margin-top: 2.15rem;
  color: #b8c3c9;
  font-size: 0.76rem;
  font-weight: 600;
}

.site-footer {
  padding: 0;
  color: #ffffff;
  background: #000000;
}

.footer-inner {
  width: min(100%, 1280px);
  margin: 0 auto;
  padding: 3.6rem 1.5rem 3rem;
}

.footer-main {
  display: grid;
  gap: 2.8rem;
}

.footer-brand {
  max-width: 860px;
}

.footer-logo {
  display: block;
  width: 360px;
  max-width: 100%;
  height: auto;
  filter: brightness(0) invert(1);
}

.footer-description {
  display: block;
  margin: 1.6rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.95;
}

.footer-link-area h2 {
  margin: 0 0 1.25rem;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.4;
}

.footer-link-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.8rem;
  max-width: 880px;
}

.footer-links,
.footer-link-descriptions {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: #ffffff;
  font-size: 1rem;
  line-height: 1.35;
}

.footer-links a::before {
  content: "›";
  display: inline-block;
  width: 1.2rem;
  font-weight: 900;
}

.footer-link-descriptions li {
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.5;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 5rem;
  color: var(--muted);
}

.footer-bottom p {
  margin: 0;
  font-size: 0.86rem;
  font-weight: 600;
}

@media (max-width: 900px) {
  :root {
    --header-height: 104px;
  }

  .header {
    height: var(--header-height);
    grid-template-columns: 1fr;
    align-content: center;
    row-gap: 0.8rem;
    padding: 0.8rem 1rem;
  }

    .brand {
        margin-right: 0;
    }

  .nav {
    justify-content: flex-start;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 0.2rem;
  }

  .nav a {
    font-size: 0.75rem;
  }

  .articles {
    padding-inline: 1.25rem;
  }

  .articles-grid {
    grid-template-columns: 1fr;
    gap: 1rem;

  }

  .footer-link-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
    
    .footer-logo {
        width: 240px;
    }
}

.page-section{
    min-height: 80vh;
}

.breadcrumb{
    max-width: 820px;
    padding-inline: 1.25rem;
    margin: 1.5rem auto;
}

.breadcrumb-nav-compact {
    max-width: 920px;
    margin-left: auto;
    margin-right: auto;
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 0.75rem;
    list-style: none;
    padding: 0;
    margin: 0;
    color: #64748b;
    font-size: 0.9rem;
}

.breadcrumb-item {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.breadcrumb-item:not(:last-child)::after {
    content: '/';
    color: #94a3b8;
}

.breadcrumb-item a {
    color: #0f766e;
    text-decoration: none;
}

.breadcrumb-item span[aria-current="page"] {
    color: #334155;
}