/* ── リセット & ベース ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #f59e0b;
  --text: #1e293b;
  --text-light: #64748b;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', 'Yu Gothic', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ── ユーティリティ ── */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

.section-header { text-align: center; margin-bottom: 56px; }
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
  background: #eff6ff;
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 12px;
}
.section-title { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; margin-bottom: 16px; }
.section-desc { color: var(--text-light); max-width: 560px; margin: 0 auto; }

/* ── ボタン ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 16px rgba(37,99,235,0.35);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.45); }
.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover { background: rgba(255,255,255,0.15); transform: translateY(-2px); }

/* ── ヘッダー ── */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0;
  transition: background var(--transition), box-shadow var(--transition);
}
.header.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 24px rgba(0,0,0,0.08);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1120px;
  margin: 0 auto;
  padding: 20px 24px;
}
.nav-logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  transition: color var(--transition);
}
.header.scrolled .nav-logo { color: var(--text); }

.nav-links {
  display: flex;
  gap: 36px;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-links a:hover::after { transform: scaleX(1); }
.header.scrolled .nav-links a { color: var(--text-light); }
.header.scrolled .nav-links a:hover { color: var(--primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: background var(--transition);
}
.header.scrolled .nav-toggle span { background: var(--text); }

/* ── ヒーロー ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
  overflow: hidden;
  background: linear-gradient(135deg, #1e40af 0%, #1d4ed8 40%, #2563eb 70%, #3b82f6 100%);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(99,179,255,0.15) 0%, transparent 60%),
    url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}
.hero-label {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.75);
  margin-bottom: 16px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.75rem);
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 24px;
}
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.8);
  margin-bottom: 40px;
  line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ── サービス ── */
.services {
  padding: 100px 0;
  background: var(--bg-alt);
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
}
.service-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}
.service-card:hover { transform: translateY(-6px); box-shadow: 0 12px 40px rgba(0,0,0,0.12); }
.service-icon { font-size: 2.5rem; margin-bottom: 20px; }
.service-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 12px; }
.service-card p { color: var(--text-light); font-size: 0.9rem; line-height: 1.75; }

/* ── 会社概要 ── */
.about { padding: 100px 0; background: var(--bg); }
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-text .section-label { margin-bottom: 12px; }
.about-text .section-title { text-align: left; margin-bottom: 20px; }
.about-text > p { color: var(--text-light); margin-bottom: 32px; }

.about-list { display: grid; gap: 12px; }
.about-list li {
  display: flex;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
.about-list li:last-child { border-bottom: none; }
.about-list strong {
  min-width: 80px;
  color: var(--text-light);
  font-weight: 600;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stat-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: transform var(--transition);
}
.stat-card:hover { transform: translateY(-4px); }
.stat-num {
  display: block;
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-num small { font-size: 1.2rem; }
.stat-label { font-size: 0.8rem; color: var(--text-light); font-weight: 600; }

/* ── お問い合わせ ── */
.contact {
  padding: 100px 0;
  background: var(--bg-alt);
}
.contact-form {
  max-width: 720px;
  margin: 0 auto;
  background: #fff;
  border-radius: var(--radius);
  padding: 48px 40px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.form-group label { font-size: 0.875rem; font-weight: 600; color: var(--text); }
.required { color: #ef4444; }
.form-group input,
.form-group textarea {
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-alt);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
  background: #fff;
}
.form-group textarea { resize: vertical; min-height: 140px; }
.form-submit { text-align: center; margin-top: 8px; }
.form-submit .btn { padding: 16px 56px; font-size: 1rem; }
.form-note { text-align: center; margin-top: 16px; font-size: 0.875rem; color: #16a34a; }

/* ── フッター ── */
.footer {
  background: var(--text);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}
.footer-logo { font-size: 1.1rem; font-weight: 800; color: #fff; }
.footer-nav { display: flex; gap: 28px; flex-wrap: wrap; justify-content: center; }
.footer-nav a { font-size: 0.875rem; transition: color var(--transition); }
.footer-nav a:hover { color: #fff; }
.footer-copy { font-size: 0.8rem; }

/* ── レスポンシブ ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; right: 0;
    background: #fff;
    padding: 80px 24px 32px;
    gap: 20px;
    box-shadow: var(--shadow);
    z-index: 99;
  }
  .nav-links.open a { color: var(--text); font-size: 1.1rem; }
  .nav-toggle { display: flex; z-index: 101; }

  .about-inner { grid-template-columns: 1fr; gap: 40px; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 32px 20px; }
  .about-stats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; align-items: center; }
  .about-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card { padding: 20px 12px; }
}