:root {
  --bg: #ffffff;
  --bg-alt: #f5f9fb;
  --surface: #ffffff;
  --border: #e3edf0;
  --text: #0e2a33;
  --muted: #5f747c;
  --accent: #47bacc;
  --accent-deep: #2f7d96;
  --accent-soft: #eef6f8;
  --gold: #d9ae55;
  --gold-soft: #fff7e6;
  --radius: 18px;
  --maxw: 1100px;
  --font: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP",
    system-ui, -apple-system, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(20px, 5vw, 48px);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--text);
}

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

.brand-light {
  font-weight: 600;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--accent-deep);
}

/* Layout */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 48px);
}

.section {
  padding: clamp(64px, 10vw, 120px) 0;
}

.section-alt {
  position: relative;
}

.section-alt::before {
  content: "";
  position: absolute;
  inset: 0 calc(50% - 50vw);
  background: var(--bg-alt);
  z-index: -1;
}

.section-head {
  max-width: 660px;
  margin-bottom: 48px;
}

.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-deep);
  margin: 0 0 14px;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  line-height: 1.3;
  margin: 0 0 24px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  margin: 0 0 16px;
  font-weight: 800;
}

h3 {
  font-size: 1.12rem;
  margin: 0 0 8px;
  font-weight: 700;
}

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(32px, 6vw, 72px);
  align-items: center;
  padding: clamp(56px, 9vw, 110px) 0 clamp(48px, 8vw, 96px);
}

.lead {
  font-size: clamp(1.02rem, 1.8vw, 1.2rem);
  color: var(--muted);
  max-width: 560px;
  margin: 0 0 36px;
}

.lead strong {
  color: var(--accent-deep);
  font-weight: 700;
}

.section-lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0;
}

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

.hero-visual img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 24px 60px -24px rgba(47, 125, 150, 0.45);
  border: 1px solid var(--border);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  transition: transform 0.15s, background 0.2s, border-color 0.2s, box-shadow 0.2s;
  border: 1px solid transparent;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px -12px rgba(71, 186, 204, 0.9);
}

.btn-primary:hover {
  background: var(--accent-deep);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--accent-deep);
  background: #fff;
}

.btn-ghost:hover {
  border-color: var(--accent);
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -24px rgba(47, 125, 150, 0.4);
}

.card-icon {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  border-radius: 14px;
  background: var(--accent-soft);
  margin-bottom: 16px;
}

.card p {
  color: var(--muted);
  margin: 0;
  font-size: 0.96rem;
}

/* Product */
.product-logo {
  height: 44px;
  width: auto;
  margin: 4px 0 18px;
}

.product-note {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 40px;
  padding: 20px 24px;
  background: var(--gold-soft);
  border: 1px solid #ecd9a8;
  border-radius: var(--radius);
}

.product-note p {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
}

.product-note a {
  color: var(--accent-deep);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.badge {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
  background: #fff;
  border: 1px solid #ecd9a8;
  padding: 5px 12px;
  border-radius: 999px;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.about-grid p {
  margin: 0;
  color: var(--muted);
}

/* Contact */
.contact-box {
  background: linear-gradient(135deg, var(--accent-soft), #fff);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(36px, 5vw, 56px);
  text-align: center;
}

.contact-sub {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px clamp(20px, 5vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.copyright {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 820px) {
  .hero {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    order: -1;
    max-width: 460px;
  }
}

@media (max-width: 560px) {
  .nav {
    display: none;
  }
}