:root {
  color-scheme: light;
  --ink: #16202f;
  --muted: #607086;
  --line: #d8e0ea;
  --soft: #f4f7fb;
  --paper: #ffffff;
  --accent: #0b72ff;
  --accent-2: #21c7b7;
  --warm: #ffe8bd;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", Arial, sans-serif;
  line-height: 1.75;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.nav {
  max-width: 1180px;
  margin: 0 auto;
  min-height: 72px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links a[aria-current="page"] {
  color: var(--accent);
  font-weight: 800;
}

.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 86px 24px 70px;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: 44px;
  align-items: center;
}

.eyebrow {
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 14px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.hero h1 {
  font-size: clamp(2.7rem, 6vw, 5.8rem);
  line-height: 1.03;
  letter-spacing: 0;
  margin-bottom: 24px;
}

.hero p {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.12rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
}

.button.secondary {
  background: #e7edf5;
  color: var(--ink);
}

.editor-card {
  background: linear-gradient(145deg, #ffffff, #edf8ff);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 30px;
  box-shadow: 0 24px 60px rgba(31, 58, 90, 0.12);
}

.card-kicker {
  display: block;
  color: var(--accent-2);
  font-weight: 900;
  margin-bottom: 16px;
}

.editor-card strong {
  display: block;
  font-size: 1.7rem;
  line-height: 1.2;
  margin-bottom: 14px;
}

.editor-card p {
  color: var(--muted);
  margin-bottom: 0;
}

.band,
.split-band {
  max-width: 1180px;
  margin: 0 auto 28px;
  padding: 48px 24px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 24px;
}

.section-head h2,
.split-band h2,
.compact h2 {
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1.1;
}

.section-head p {
  max-width: 520px;
  color: var(--muted);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.post-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.post-cover {
  min-height: 210px;
  background:
    radial-gradient(circle at 22% 24%, rgba(33, 199, 183, 0.55), transparent 24%),
    radial-gradient(circle at 78% 18%, rgba(11, 114, 255, 0.45), transparent 28%),
    linear-gradient(135deg, #122033, #f8fbff 64%, #ffe8bd);
}

.post-body {
  padding: 24px;
}

.post-body span {
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 800;
}

.post-body h3 {
  margin: 10px 0 12px;
  font-size: 1.45rem;
  line-height: 1.25;
}

.post-body p {
  color: var(--muted);
}

.post-body a {
  color: var(--accent);
  font-weight: 900;
}

.split-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: stretch;
}

.split-band > div:first-child,
.compact {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 30px;
}

.split-band p {
  color: var(--muted);
}

.ad-slot,
.article-ad {
  min-height: 180px;
  display: grid;
  place-items: center;
  border: 1px dashed #9fb1c8;
  border-radius: 8px;
  color: #7d8da2;
  background: repeating-linear-gradient(135deg, #f1f5fa, #f1f5fa 10px, #e8eef6 10px, #e8eef6 20px);
}

.topic-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.topic-row span {
  padding: 10px 14px;
  background: #e7f0ff;
  border: 1px solid #c8daf5;
  border-radius: 999px;
  font-weight: 800;
  color: #1e5cae;
}

.article-shell {
  max-width: 920px;
  margin: 0 auto;
  padding: 68px 24px;
}

.article {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(24px, 5vw, 54px);
}

.article h1 {
  font-size: clamp(2.2rem, 5vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: 0;
  margin-bottom: 20px;
}

.lead {
  color: var(--muted);
  font-size: 1.14rem;
}

.date {
  color: var(--muted);
  font-weight: 800;
}

.article section {
  margin-top: 34px;
}

.article h2 {
  font-size: 1.7rem;
  line-height: 1.25;
}

.article p {
  color: #334256;
}

.video-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #f8fbff;
}

.video-placeholder {
  aspect-ratio: 16 / 9;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background:
    linear-gradient(135deg, rgba(11, 114, 255, 0.18), rgba(33, 199, 183, 0.2)),
    #102033;
  color: #fff;
  font-weight: 900;
}

.related {
  display: grid;
  gap: 10px;
}

.related a {
  color: var(--accent);
  font-weight: 800;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #fff;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner a {
  color: #3e5068;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 18px;
  }

  .nav-links {
    justify-content: flex-start;
    gap: 12px 16px;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 54px 18px 38px;
  }

  .section-head,
  .split-band {
    display: block;
  }

  .band,
  .split-band,
  .article-shell {
    padding-left: 18px;
    padding-right: 18px;
  }

  .ad-slot {
    margin-top: 18px;
  }
}