:root {
  --blue: #007aff;
  --blue-deep: #004691;
  --yellow: #ffc107;
  --ink: #2d3748;
  --ink-soft: #5b6678;
  --line: #e3e8f0;
  --bg: #ffffff;
  --bg-tint: #f4f7fb;
  --radius: 14px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Poppins", "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--yellow); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 1040px; margin-inline: auto; padding-inline: 20px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 10px; }
.brand img { height: 44px; width: 44px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 600; }
nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 22px; flex-wrap: wrap; }
nav a { color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 500; }
nav a:hover { color: var(--blue); }

/* Type */
.eyebrow { font-size: 12px; letter-spacing: 0.22em; text-transform: uppercase; color: var(--blue); font-weight: 600; margin: 0 0 12px; }
h1, h2, h3 { line-height: 1.35; text-wrap: balance; margin: 0; }
h2 { font-size: clamp(24px, 4vw, 32px); font-weight: 600; margin-bottom: 20px; }
h3 { font-size: 18px; font-weight: 600; }
p { margin: 0 0 1em; }

section { padding-block: 72px; }
.tint { background: var(--bg-tint); }

/* Hero */
.hero { padding-block: 72px 56px; }
.hero .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); font-weight: 600; letter-spacing: 0.02em; }
.hero h1 em { font-style: normal; color: var(--blue); }
.hero .sub { color: var(--ink-soft); margin-top: 20px; }
.hero .tag { font-size: 12px; letter-spacing: 0.22em; color: var(--ink-soft); margin-top: 28px; }
.hero img { width: min(100%, 360px); margin-inline: auto; }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: 999px;
  background: var(--blue); color: #fff; text-decoration: none; font-weight: 600; font-size: 15px;
  transition: background 0.15s;
}
.btn:hover { background: var(--blue-deep); }

/* Product card */
.product {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg);
  padding: 24px; text-decoration: none; color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}
.product:hover { border-color: var(--blue); transform: translateY(-2px); }
.product .icon {
  width: 72px; height: 72px; border-radius: 18px; flex: none;
  background: var(--blue); color: #fff; display: grid; place-items: center;
  font-size: 30px; font-weight: 700;
}
.product .body { flex: 1 1 240px; }
.product .body p { margin: 4px 0 0; color: var(--ink-soft); font-size: 14px; }
.product .go { color: var(--blue); font-weight: 600; font-size: 14px; }

/* Concept */
.concept img { border: 1px solid var(--line); border-radius: var(--radius); width: 100%; }
.palette { display: flex; gap: 20px; flex-wrap: wrap; margin-top: 24px; font-size: 13px; color: var(--ink-soft); }
.palette span { display: inline-flex; align-items: center; gap: 8px; }
.palette i { width: 16px; height: 16px; border-radius: 50%; display: inline-block; }

/* Support page */
.page-head { padding-block: 56px 40px; }
.page-head h1 { font-size: clamp(28px, 5vw, 40px); font-weight: 600; }
.page-head p { color: var(--ink-soft); max-width: 40em; margin-top: 12px; }
.crumb { font-size: 13px; color: var(--ink-soft); margin-bottom: 16px; }
.crumb a { color: var(--ink-soft); }

.links { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.links a {
  display: block; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg); color: var(--ink); text-decoration: none;
}
.links a:hover { border-color: var(--blue); }
.links b { display: block; color: var(--blue); margin-bottom: 4px; }
.links span { font-size: 14px; color: var(--ink-soft); }

details { border-bottom: 1px solid var(--line); }
details:first-of-type { border-top: 1px solid var(--line); }
summary { cursor: pointer; padding: 18px 4px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--blue); font-size: 20px; line-height: 1.4; }
details[open] summary::after { content: "−"; }
details .ans { padding: 0 4px 20px; color: var(--ink-soft); }

.contact-box {
  background: var(--ink); color: #fff; border-radius: var(--radius);
  padding: 32px; display: flex; gap: 24px; justify-content: space-between; align-items: center; flex-wrap: wrap;
}
.contact-box h2 { margin: 0 0 6px; font-size: 22px; }
.contact-box p { margin: 0; color: #cfd6e2; font-size: 14px; }
.contact-box .btn { background: var(--yellow); color: var(--ink); }
.contact-box .btn:hover { background: #ffd54f; }

/* Footer */
footer { border-top: 1px solid var(--line); padding-block: 32px; font-size: 13px; color: var(--ink-soft); }
footer .wrap { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
footer .tag { letter-spacing: 0.18em; font-size: 11px; }

@media (max-width: 720px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero img { order: -1; width: 180px; margin-inline: 0; }
  section { padding-block: 52px; }
  nav ul { gap: 14px; }
}

/* Support: steps & table */
.steps { list-style: none; counter-reset: s; margin: 0 0 20px; padding: 0; display: grid; gap: 14px; }
.steps li { counter-increment: s; position: relative; padding-left: 52px; }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 2px; width: 34px; height: 34px; border-radius: 50%;
  background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 600; font-size: 15px;
}
.steps b { display: block; margin-bottom: 2px; }
.note { color: var(--ink-soft); font-size: 14px; }
.table-scroll { overflow-x: auto; margin-top: 32px; }
table { border-collapse: collapse; width: 100%; min-width: 480px; font-size: 14px; background: var(--bg); }
caption { text-align: left; font-size: 13px; color: var(--ink-soft); padding-bottom: 8px; }
th, td { text-align: left; padding: 10px 12px; border: 1px solid var(--line); }
th { background: var(--bg-tint); font-weight: 600; }