/* ===========================
   CSS Variables & Reset
=========================== */
:root {
  --color-main: #1A6FBF;
  --color-main-dark: #145a9e;
  --color-accent: #D4A017;
  --color-accent-dark: #b88a12;
  --color-text: #1a1a1a;
  --color-text-sub: #555;
  --color-bg: #ffffff;
  --color-bg-gray: #f5f6f8;
  --color-bg-dark: #0d1a2b;
  --color-border: #e0e4ea;
  --font-serif: 'Noto Serif JP', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --radius: 8px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.15);
  --transition: 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); color: var(--color-text); background: var(--color-bg); line-height: 1.7; font-size: 15px; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===========================
   Typography
=========================== */
.sec-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}
.sec-subtitle {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-main);
  margin-bottom: 0.5rem;
}
.sec-desc { color: var(--color-text-sub); margin-top: 1rem; font-size: 0.95rem; }

/* ===========================
   Layout
=========================== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1.25rem; }
.section { padding: 80px 0; }
.section--gray { background: var(--color-bg-gray); }
.section--dark { background: var(--color-bg-dark); color: #fff; }
.section-head { text-align: center; margin-bottom: 3rem; }
.section-head .sec-title { margin-bottom: 0.5rem; }

/* ===========================
   Buttons
=========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  font-family: var(--font-sans);
}
.btn-primary { background: var(--color-main); color: #fff; border-color: var(--color-main); }
.btn-primary:hover { background: var(--color-main-dark); border-color: var(--color-main-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,111,191,0.35); }
.btn-accent { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }
.btn-accent:hover { background: var(--color-accent-dark); border-color: var(--color-accent-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(212,160,23,0.35); }
.btn-outline { background: transparent; color: var(--color-main); border-color: var(--color-main); }
.btn-outline:hover { background: var(--color-main); color: #fff; transform: translateY(-2px); }
.btn-outline-white { background: transparent; color: #fff; border-color: rgba(255,255,255,0.7); }
.btn-outline-white:hover { background: rgba(255,255,255,0.15); border-color: #fff; }

/* ===========================
   Header / Nav
=========================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.1); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  padding: 0 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}
.site-logo { display: flex; align-items: center; gap: 0.75rem; }
.site-logo svg { width: 36px; height: 36px; flex-shrink: 0; }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-text .company-name { font-family: var(--font-serif); font-size: 1rem; font-weight: 700; color: var(--color-main); }
.logo-text .company-name-sub { font-size: 0.65rem; color: var(--color-text-sub); letter-spacing: 0.05em; }
.site-nav { display: flex; align-items: center; gap: 2rem; }
.site-nav a { font-size: 0.85rem; font-weight: 500; color: var(--color-text); transition: color var(--transition); position: relative; }
.site-nav a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--color-main); transition: width var(--transition); }
.site-nav a:hover { color: var(--color-main); }
.site-nav a:hover::after, .site-nav a.active::after { width: 100%; }
.site-nav a.active { color: var(--color-main); }
.header-contact-btn { padding: 0.55rem 1.25rem; font-size: 0.85rem; }

/* Hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition); }
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu { display: none; position: fixed; top: 68px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--color-border); padding: 1.5rem; z-index: 999; flex-direction: column; gap: 1rem; }
.mobile-menu.open { display: flex; }
.mobile-menu a { font-size: 1rem; font-weight: 500; padding: 0.6rem 0; border-bottom: 1px solid var(--color-border); color: var(--color-text); }
.mobile-menu a:last-child { border-bottom: none; }

/* ===========================
   Page Hero (sub pages)
=========================== */
.page-hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1A3A5C 100%);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(26,111,191,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero-eyebrow { display: inline-block; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--color-accent); border: 1px solid var(--color-accent); padding: 0.25rem 0.75rem; border-radius: 2px; margin-bottom: 1rem; }
.page-hero h1 { font-family: var(--font-serif); font-size: clamp(1.8rem, 4.5vw, 3rem); font-weight: 700; color: #fff; line-height: 1.3; margin-bottom: 0.75rem; }
.page-hero p { color: rgba(255,255,255,0.7); font-size: 0.95rem; max-width: 540px; }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 0.5rem; margin-top: 1.5rem; }
.breadcrumb a, .breadcrumb span { font-size: 0.8rem; color: rgba(255,255,255,0.5); }
.breadcrumb a:hover { color: rgba(255,255,255,0.85); }
.breadcrumb .sep { color: rgba(255,255,255,0.3); }
.breadcrumb .current { color: rgba(255,255,255,0.8); }

/* ===========================
   Accent decorations
=========================== */
.accent-line { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.accent-line::before { content: ''; display: block; width: 32px; height: 2px; background: var(--color-accent); }

/* ===========================
   Contact CTA (shared)
=========================== */
.contact-cta { background: var(--color-bg-gray); padding: 80px 0; }
.contact-cta-inner { text-align: center; max-width: 640px; margin: 0 auto; }
.contact-cta-inner .sec-title { margin-bottom: 1rem; }
.contact-cta-inner p { color: var(--color-text-sub); margin-bottom: 2rem; line-height: 1.9; }
.contact-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.contact-tel-block { display: flex; flex-direction: column; align-items: center; gap: 0.25rem; margin-top: 2rem; }
.contact-tel-label { font-size: 0.75rem; color: var(--color-text-sub); letter-spacing: 0.08em; }
.contact-tel-number { font-family: var(--font-serif); font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 700; color: var(--color-main); letter-spacing: 0.05em; }
.contact-tel-time { font-size: 0.75rem; color: var(--color-text-sub); }

/* ===========================
   Footer
=========================== */
.site-footer { background: #0a1520; color: rgba(255,255,255,0.75); padding: 60px 0 30px; }
.footer-inner { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-brand .logo-text .company-name { color: #fff; }
.footer-desc { font-size: 0.85rem; line-height: 1.85; color: rgba(255,255,255,0.55); margin-top: 1rem; }
.footer-nav-title { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: rgba(255,255,255,0.45); margin-bottom: 1rem; }
.footer-nav ul { display: flex; flex-direction: column; gap: 0.65rem; }
.footer-nav ul li a { font-size: 0.85rem; color: rgba(255,255,255,0.7); transition: color var(--transition); }
.footer-nav ul li a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding-top: 1.5rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.footer-bottom small { font-size: 0.75rem; color: rgba(255,255,255,0.35); }
.footer-address { font-size: 0.8rem; color: rgba(255,255,255,0.5); line-height: 1.7; margin-top: 1rem; }

/* ===========================
   Scroll animations
=========================== */
.fade-up { opacity: 0; transform: translateY(30px); transition: opacity 0.65s ease, transform 0.65s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }

/* ===========================
   Responsive
=========================== */
@media (max-width: 1024px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .site-nav, .header-contact-btn { display: none; }
  .hamburger { display: flex; }
  .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .page-hero { padding: 120px 0 60px; }
}