/* ============================================
   中世株式会社 CHUSEI Co., Ltd. — Corporate Site
   ============================================ */
:root {
  --primary: #14365c;
  --primary-dark: #0d2540;
  --accent: #c8102e;
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --text: #22292f;
  --text-sub: #5c6672;
  --border: #e3e7ec;
  --radius: 6px;
  --max-width: 1120px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans",
    "Noto Sans JP", "Microsoft YaHei", "PingFang SC", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: 0 2px 16px rgba(13, 37, 64, 0.08); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--primary-dark);
  letter-spacing: 0.04em;
}
.logo-mark {
  width: 34px;
  height: 34px;
  background: var(--primary);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 15px;
  font-weight: 800;
  border-radius: 4px;
  letter-spacing: 0;
}
.logo small { font-size: 10px; font-weight: 500; color: var(--text-sub); display: block; letter-spacing: 0.18em; }

.main-nav ul { display: flex; gap: 30px; }
.main-nav a {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text);
  padding: 8px 0;
  position: relative;
  transition: color 0.25s;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); }
.main-nav a.active::after, .main-nav a:hover::after { width: 100%; }

.lang-switch {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-left: 18px;
}
.lang-switch button {
  border: none;
  background: transparent;
  padding: 5px 10px;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-sub);
  cursor: pointer;
  transition: 0.2s;
}
.lang-switch button + button { border-left: 1px solid var(--border); }
.lang-switch button.active { background: var(--primary); color: #fff; }

.header-cta {
  margin-left: 22px;
  background: var(--accent);
  color: #fff !important;
  padding: 9px 20px !important;
  border-radius: var(--radius);
  font-weight: 700;
}
.header-cta::after { display: none !important; }
.header-cta:hover { filter: brightness(1.1); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
  position: relative;
}
.nav-toggle span {
  position: absolute;
  left: 8px; right: 8px;
  height: 2px;
  background: var(--primary-dark);
  transition: 0.3s;
}
.nav-toggle span:nth-child(1) { top: 13px; }
.nav-toggle span:nth-child(2) { top: 20px; }
.nav-toggle span:nth-child(3) { top: 27px; }
.nav-toggle.open span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

/* ---------- Page hero (sub pages) ---------- */
.page-hero {
  background: linear-gradient(120deg, var(--primary-dark) 0%, var(--primary) 65%, #2a5382 100%);
  color: #fff;
  padding: 72px 0 56px;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute;
  right: -60px; top: -60px;
  width: 320px; height: 320px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
}
.page-hero .en-label {
  font-size: 13px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  opacity: 0.75;
  display: block;
  margin-bottom: 10px;
}
.page-hero h1 { font-size: 34px; letter-spacing: 0.06em; }

/* ---------- Home hero ---------- */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  color: #fff;
  background-size: cover;
  background-position: center;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(10, 28, 50, 0.85) 15%, rgba(10, 28, 50, 0.45) 75%);
}
.hero-inner { position: relative; z-index: 1; padding: 90px 24px; }
.hero-tag {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.22em;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 6px 16px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(30px, 5vw, 50px);
  line-height: 1.3;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}
.hero p {
  font-size: clamp(15px, 2vw, 18px);
  max-width: 640px;
  opacity: 0.92;
  margin-bottom: 34px;
}
.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 15px;
  transition: 0.25s;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.12); transform: translateY(-2px); }
.btn-ghost {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.7);
  margin-left: 12px;
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.14); }
.btn-dark { background: var(--primary); color: #fff; }
.btn-dark:hover { background: var(--primary-dark); }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-alt { background: var(--bg-soft); }

.sec-head { text-align: center; margin-bottom: 52px; }
.sec-head .en-label {
  display: block;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.sec-head h2 {
  font-size: clamp(24px, 3.4vw, 32px);
  color: var(--primary-dark);
  letter-spacing: 0.05em;
}
.sec-head p { color: var(--text-sub); margin-top: 12px; }

/* ---------- Stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 70px;
}
.stat {
  text-align: center;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 12px;
}
.stat .num {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary);
  font-family: Georgia, serif;
}
.stat .num small { font-size: 18px; margin-left: 2px; }
.stat .label { font-size: 13.5px; color: var(--text-sub); margin-top: 6px; }

/* ---------- Cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: 0.3s;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 16px 34px rgba(13, 37, 64, 0.13); }
.card img { height: 190px; width: 100%; object-fit: cover; }
.card-body { padding: 24px; }
.card-body h3 { color: var(--primary-dark); font-size: 19px; margin-bottom: 10px; }
.card-body p { font-size: 14.5px; color: var(--text-sub); }

/* ---------- Strength list ---------- */
.strength-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.strength {
  background: #fff;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 26px 28px;
  box-shadow: 0 4px 18px rgba(13, 37, 64, 0.06);
}
.strength h3 { color: var(--primary-dark); font-size: 18px; margin-bottom: 8px; display: flex; align-items: center; gap: 12px; }
.strength h3 .no {
  color: var(--accent);
  font-family: Georgia, serif;
  font-size: 24px;
  font-weight: 800;
}
.strength p { font-size: 14.5px; color: var(--text-sub); }

/* ---------- About teaser ---------- */
.about-teaser { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.about-teaser img { border-radius: var(--radius); box-shadow: 0 14px 34px rgba(13, 37, 64, 0.14); }
.about-teaser h2 { color: var(--primary-dark); font-size: 28px; margin-bottom: 16px; }
.about-teaser p { color: var(--text-sub); margin-bottom: 26px; }

/* ---------- News list ---------- */
.news-list { max-width: 860px; margin: 0 auto; }
.news-item {
  display: flex;
  gap: 28px;
  align-items: baseline;
  padding: 20px 6px;
  border-bottom: 1px solid var(--border);
}
.news-item time { font-weight: 700; color: var(--primary); white-space: nowrap; font-size: 14.5px; }
.news-item .cat {
  font-size: 12px;
  font-weight: 700;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 1px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.news-item p { font-size: 15px; }
.news-more { text-align: center; margin-top: 36px; }

/* ---------- CTA ---------- */
.cta-band {
  background: linear-gradient(115deg, var(--primary-dark), var(--primary));
  color: #fff;
  text-align: center;
  padding: 70px 0;
}
.cta-band h2 { font-size: 28px; margin-bottom: 12px; letter-spacing: 0.05em; }
.cta-band p { opacity: 0.88; margin-bottom: 30px; }

/* ---------- Table (company profile) ---------- */
.profile-table {
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  border-collapse: collapse;
  background: #fff;
  border: 1px solid var(--border);
}
.profile-table th, .profile-table td {
  border: 1px solid var(--border);
  padding: 16px 22px;
  text-align: left;
  font-size: 15px;
}
.profile-table th {
  background: var(--bg-soft);
  color: var(--primary-dark);
  font-weight: 700;
  width: 220px;
  white-space: nowrap;
}

/* ---------- Greeting / detail sections ---------- */
.detail-block { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; margin-bottom: 64px; }
.detail-block:last-child { margin-bottom: 0; }
.detail-block img { border-radius: var(--radius); box-shadow: 0 14px 34px rgba(13, 37, 64, 0.12); }
.detail-block h2 {
  color: var(--primary-dark);
  font-size: 24px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}
.detail-block p { color: var(--text-sub); font-size: 15px; }

/* ---------- History ---------- */
.history { max-width: 760px; margin: 0 auto; position: relative; padding-left: 26px; }
.history::before {
  content: "";
  position: absolute;
  left: 5px; top: 6px; bottom: 6px;
  width: 2px;
  background: var(--border);
}
.history li { position: relative; padding-bottom: 28px; }
.history li::before {
  content: "";
  position: absolute;
  left: -26px; top: 8px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--accent);
}
.history time { font-weight: 800; color: var(--primary); font-size: 17px; display: block; }
.history p { color: var(--text-sub); font-size: 14.5px; }

/* ---------- Contact ---------- */
.contact-wrap { max-width: 720px; margin: 0 auto; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 44px; }
.form-row { margin-bottom: 22px; }
.form-row label { display: block; font-weight: 700; font-size: 14.5px; margin-bottom: 7px; color: var(--primary-dark); }
.form-row label .req { color: var(--accent); font-size: 12px; margin-left: 6px; }
.form-row input, .form-row textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  transition: border 0.2s;
  background: var(--bg-soft);
}
.form-row input:focus, .form-row textarea:focus { outline: none; border-color: var(--primary); background: #fff; }
.form-success {
  display: none;
  background: #e8f6ee;
  border: 1px solid #7cc79b;
  color: #1d6b40;
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-bottom: 22px;
  font-size: 14.5px;
}
.map-embed { width: 100%; height: 340px; border: 0; border-radius: var(--radius); }
.contact-info { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 40px; }
.info-box { background: var(--bg-soft); border-radius: var(--radius); padding: 22px 24px; }
.info-box h3 { color: var(--primary-dark); font-size: 15.5px; margin-bottom: 6px; }
.info-box p { font-size: 14.5px; color: var(--text-sub); }

/* ---------- Footer ---------- */
.site-footer { background: var(--primary-dark); color: rgba(255, 255, 255, 0.85); padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 44px; padding-bottom: 44px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 14px; letter-spacing: 0.08em; }
.footer-grid p, .footer-grid a { font-size: 14px; opacity: 0.85; }
.footer-grid li { margin-bottom: 9px; }
.footer-grid a:hover { color: #fff; opacity: 1; }
.footer-brand { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  padding: 18px 0;
  font-size: 12.5px;
  opacity: 0.7;
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .card-grid { grid-template-columns: 1fr; }
  .strength-grid, .about-teaser, .detail-block, .contact-info { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }

  .nav-toggle { display: block; }
  .main-nav {
    position: fixed;
    top: 68px;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    box-shadow: 0 12px 24px rgba(13, 37, 64, 0.1);
  }
  .main-nav.open { max-height: 420px; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 12px 24px 20px; }
  .main-nav a { display: block; padding: 13px 0; border-bottom: 1px solid var(--border); }
  .header-cta { display: none; }
}