:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #1b2430;
  --muted: #5c6b7a;
  --line: #dce4ee;
  --primary: #0f7bff;
  --primary-2: #06b6d4;
  --shadow: 0 14px 36px rgba(11, 34, 58, 0.12);
  --radius: 18px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Noto Sans JP", "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1000px 480px at 110% -20%, rgba(15,123,255,.16), transparent 60%),
    radial-gradient(900px 420px at -10% -20%, rgba(6,182,212,.16), transparent 55%),
    var(--bg);
  line-height: 1.8;
}
.container { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
.header { padding: 28px 0 14px; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}
.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(20px, 4vw, 34px);
}
.kicker {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  background: rgba(15,123,255,.1);
}
h1 {
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.22;
  margin: 10px 0 14px;
  letter-spacing: .01em;
}
.lead { color: var(--muted); margin: 0; font-size: clamp(16px, 2.2vw, 19px); }
.article {
  margin-top: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(20px, 4vw, 34px);
}
h2 { margin: 28px 0 10px; font-size: clamp(22px, 3vw, 30px); }
h3 { margin: 20px 0 8px; font-size: clamp(18px, 2.5vw, 22px); }
p { margin: 0 0 14px; }
ul, ol { margin: 0 0 14px; padding-left: 1.3rem; }
li { margin-bottom: 6px; }
.card {
  margin: 12px 0 16px;
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
}
.cta {
  margin-top: 26px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  border-radius: 12px;
  padding: 12px 18px;
}
.sub {
  color: var(--muted);
  font-size: 14px;
}
.footer { color: var(--muted); font-size: 13px; padding: 22px 0 30px; }
@media (max-width: 640px) {
  .container { width: min(920px, calc(100% - 20px)); }
  .header { padding-top: 18px; }
}

.brand img { border-radius: 8px; display: block; }


.hero-image-wrap {
  margin: 16px 0 0;
}
.hero-image {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  object-fit: cover;
}

.article-grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.article-card {
  display: block;
  text-decoration: none;
  color: var(--text);
  background: #f8fbff;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
}
.article-card:hover {
  transform: translateY(-3px);
}
.article-card img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.article-card-title {
  display: block;
  padding: 12px 14px 14px;
  font-weight: 700;
  line-height: 1.5;
}
@media (max-width: 760px) {
  .article-grid {
    grid-template-columns: 1fr;
  }
}