*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:    #2AABEE;
  --dark:    #17212B;
  --mid:     #232e3c;
  --light-bg:#f4f8fb;
  --text:    #222;
  --muted:   #6b7c93;
  --radius:  12px;
}

body {
  font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.6;
}

/* ── NAV ─────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  height: 60px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.nav-logo svg { width: 34px; height: 34px; }
.nav-logo span {
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .03em;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: rgba(255,255,255,.75);
  text-decoration: none;
  font-size: .92rem;
  transition: color .2s;
}
.nav-links a:hover { color: #fff; }

/* ── HERO ────────────────────────────────────────────── */
.hero {
  background: linear-gradient(145deg, var(--dark) 0%, #1a2b3e 60%, #1f3a54 100%);
  color: #fff;
  text-align: center;
  padding: 100px 5vw 90px;
}
.hero-icon { margin-bottom: 28px; }
.hero-icon svg { width: 96px; height: 96px; filter: drop-shadow(0 8px 24px rgba(42,171,238,.5)); }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 16px;
}
.hero h1 span { color: var(--blue); }
.hero p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,.7);
  max-width: 560px;
  margin: 0 auto 42px;
}

.dl-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 26px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.3); }
.btn-primary {
  background: var(--blue);
  color: #fff;
}
.btn-secondary {
  background: rgba(255,255,255,.1);
  color: #fff;
  border: 1px solid rgba(255,255,255,.25);
}
.btn svg { width: 20px; height: 20px; flex-shrink: 0; }

.dl-note {
  margin-top: 18px;
  font-size: .82rem;
  color: rgba(255,255,255,.45);
}
.dl-note a { color: var(--blue); text-decoration: none; }
.dl-note a:hover { text-decoration: underline; }

/* ── FEATURES SECTION ────────────────────────────────── */
.features {
  background: var(--light-bg);
  padding: 80px 5vw;
  text-align: center;
}
.section-label {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 10px;
}
.section-sub {
  color: var(--muted);
  max-width: 520px;
  margin: 0 auto 52px;
  font-size: 1rem;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px 26px;
  text-align: left;
  box-shadow: 0 2px 14px rgba(0,0,0,.06);
  transition: transform .2s, box-shadow .2s;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 8px 28px rgba(0,0,0,.1); }
.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #e8f6fd, #c7e9fb);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.feature-icon svg { width: 26px; height: 26px; color: var(--blue); }
.feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: .9rem; color: var(--muted); line-height: 1.55; }

/* ── NEWS SECTION ────────────────────────────────────── */
.news {
  padding: 80px 5vw;
  background: #fff;
  text-align: center;
}
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.news-card {
  background: var(--light-bg);
  border-radius: var(--radius);
  padding: 24px;
  text-align: left;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: box-shadow .2s;
}
.news-card:hover { box-shadow: 0 6px 22px rgba(0,0,0,.09); }
.news-date { font-size: .78rem; color: var(--blue); font-weight: 600; margin-bottom: 8px; }
.news-card h4 { font-size: .97rem; font-weight: 700; line-height: 1.45; }

/* ── CTA BANNER ──────────────────────────────────────── */
.cta-banner {
  background: linear-gradient(135deg, var(--dark), #1c3550);
  color: #fff;
  text-align: center;
  padding: 80px 5vw;
}
.cta-banner h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; margin-bottom: 14px; }
.cta-banner p { color: rgba(255,255,255,.65); margin-bottom: 36px; max-width: 480px; margin-left: auto; margin-right: auto; }

/* ── FOOTER ──────────────────────────────────────────── */
footer {
  background: var(--dark);
  color: rgba(255,255,255,.5);
  text-align: center;
  padding: 36px 5vw;
  font-size: .86rem;
}
footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
}
footer a { color: rgba(255,255,255,.55); text-decoration: none; transition: color .2s; }
footer a:hover { color: #fff; }

/* ── RESPONSIVE ──────────────────────────────────────── */
@media (max-width: 600px) {
  .nav-links { display: none; }
  .dl-grid { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 320px; justify-content: center; }
}