:root {
  --navy: #1e2c43;
  --navy-deep: #152033;
  --navy-soft: #2a3d5c;
  --navy-line: #3a4e6d;
  --paper: #f3f5f8;
  --paper-dark: #e7ebf1;
  --white: #ffffff;
  --ink: #1f2733;
  --ink-soft: #5b6472;
  --gold: #c4a574;
  --border: #d8dee8;
  --shadow: 0 10px 30px rgba(21, 32, 51, 0.08);
  --max: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.8;
  font-size: 15px;
}

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

img {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 2px 12px rgba(21, 32, 51, 0.18);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-right: 24px;
}

.brand img {
  width: 50px;
  height: 50px;
  object-fit: cover;
  border-radius: 50%;
}

.brand-name {
  color: var(--white);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1;
}

.main-nav {
  background: var(--navy);
}

.nav-inner {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 72px;
}

.nav-list {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav-list a {
  display: block;
  padding: 14px 22px;
  color: var(--white);
  font-size: 15px;
  letter-spacing: 0.16em;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-list a:hover,
.nav-list a.current {
  background: var(--navy-soft);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 0;
  background: transparent;
  cursor: pointer;
  margin-left: auto;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--white);
}

.hero {
  background:
    linear-gradient(120deg, rgba(21, 32, 51, 0.92) 0%, rgba(30, 44, 67, 0.88) 55%, rgba(42, 61, 92, 0.86) 100%),
    radial-gradient(circle at 80% 20%, #3a4e6d 0, transparent 42%);
  background-color: var(--navy);
  color: var(--white);
  padding: 108px 0 96px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -120px;
  width: 420px;
  height: 420px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.hero-kicker {
  color: var(--gold);
  letter-spacing: 0.28em;
  font-size: 13px;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: 46px;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.35;
  margin-bottom: 18px;
}

.hero-lead {
  max-width: 720px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.86);
  margin-bottom: 36px;
}

.btn {
  display: inline-block;
  min-width: 140px;
  text-align: center;
  padding: 12px 28px;
  border: 1px solid transparent;
  letter-spacing: 0.12em;
  font-size: 14px;
  transition: 0.2s ease;
}

.btn-primary {
  background: var(--white);
  color: var(--navy);
}

.btn-primary:hover {
  background: var(--gold);
  color: var(--navy-deep);
}

.btn-ghost {
  border-color: rgba(255, 255, 255, 0.55);
  color: var(--white);
  margin-left: 12px;
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-navy {
  background: var(--navy);
  color: var(--white);
}

.btn-navy:hover {
  background: var(--navy-soft);
}

.page-banner {
  background: linear-gradient(120deg, var(--navy-deep), var(--navy) 50%, var(--navy-soft));
  color: var(--white);
  padding: 56px 0;
}

.page-banner h1 {
  font-size: 32px;
  letter-spacing: 0.2em;
  margin-bottom: 8px;
}

.page-banner p {
  color: rgba(255, 255, 255, 0.72);
  letter-spacing: 0.18em;
  font-size: 13px;
}

.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--paper);
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  font-size: 28px;
  letter-spacing: 0.18em;
  color: var(--navy);
  margin-bottom: 12px;
}

.section-title span {
  display: inline-block;
  width: 42px;
  height: 3px;
  background: var(--gold);
  margin-bottom: 12px;
}

.section-title p {
  color: var(--ink-soft);
  max-width: 760px;
  margin: 0 auto;
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 24px;
}

.grid-2 {
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 28px 24px;
}

.card h3 {
  color: var(--navy);
  font-size: 18px;
  letter-spacing: 0.08em;
  margin: 12px 0 10px;
}

.card p {
  color: var(--ink-soft);
  font-size: 14px;
}

.card-index {
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.2em;
}

.intro-text h2 {
  font-size: 28px;
  letter-spacing: 0.12em;
  color: var(--navy);
  margin-bottom: 8px;
}

.intro-text .en {
  color: var(--gold);
  letter-spacing: 0.16em;
  font-size: 12px;
  margin-bottom: 18px;
}

.intro-text p {
  margin-bottom: 14px;
  color: var(--ink-soft);
}

.stat-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-item {
  background: var(--navy);
  color: var(--white);
  padding: 28px 22px;
}

.stat-item strong {
  display: block;
  font-size: 22px;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.stat-item span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.info-table th,
.info-table td {
  border: 1px solid var(--border);
  padding: 14px 18px;
  text-align: left;
  font-size: 14px;
}

.info-table th {
  width: 180px;
  background: var(--paper);
  color: var(--navy);
  font-weight: 600;
}

.scope-box {
  background: var(--navy);
  color: var(--white);
  padding: 36px 40px;
}

.scope-box h3 {
  letter-spacing: 0.16em;
  margin-bottom: 12px;
}

.scope-box p {
  color: rgba(255, 255, 255, 0.86);
}

.step-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.step-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--white);
  border-top: 3px solid var(--navy);
}

.step-item strong {
  display: block;
  color: var(--gold);
  letter-spacing: 0.18em;
  margin-bottom: 10px;
}

.step-item h3 {
  color: var(--navy);
  margin-bottom: 8px;
  font-size: 18px;
}

.step-item p {
  color: var(--ink-soft);
  font-size: 14px;
}

.note {
  margin-top: 28px;
  padding: 16px 18px;
  background: #f8f4ec;
  border-left: 3px solid var(--gold);
  color: var(--ink-soft);
  font-size: 13px;
}

.article {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 28px 30px;
  margin-bottom: 20px;
}

.article-meta {
  color: var(--ink-soft);
  font-size: 13px;
  margin-bottom: 8px;
}

.article h3 {
  color: var(--navy);
  font-size: 20px;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}

.article p {
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.case-block {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 0;
  background: var(--white);
  border: 1px solid var(--border);
  margin-bottom: 24px;
}

.case-side {
  background: var(--navy);
  color: var(--white);
  padding: 32px 24px;
}

.case-side span {
  display: block;
  color: var(--gold);
  letter-spacing: 0.18em;
  font-size: 13px;
  margin-bottom: 12px;
}

.case-body {
  padding: 32px 28px;
}

.case-body h3 {
  color: var(--navy);
  margin-bottom: 12px;
}

.case-body p {
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.contact-card {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
}

.contact-card h3 {
  color: var(--navy);
  margin-bottom: 12px;
  letter-spacing: 0.1em;
}

.contact-card p,
.contact-card a {
  color: var(--ink-soft);
}

.contact-card a:hover {
  color: var(--navy);
}

.mail-action {
  margin-top: 18px;
}

.cta-bar {
  background: var(--navy-deep);
  color: var(--white);
  padding: 48px 0;
  text-align: center;
}

.cta-bar h2 {
  letter-spacing: 0.16em;
  margin-bottom: 12px;
}

.cta-bar p {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 22px;
}

.site-footer {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.82);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.3fr;
  gap: 40px;
  padding: 56px 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.footer-brand img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.footer-brand strong {
  display: block;
  color: var(--white);
  letter-spacing: 0.12em;
}

.site-footer h3 {
  color: var(--white);
  font-size: 16px;
  letter-spacing: 0.14em;
  margin-bottom: 16px;
}

.site-footer li {
  margin-bottom: 8px;
}

.site-footer a:hover {
  color: var(--gold);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  padding: 18px 16px 24px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
}

.footer-bottom a:hover {
  color: var(--white);
}

@media (max-width: 960px) {
  .nav-toggle {
    display: block;
  }

  .nav-inner {
    justify-content: space-between;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--navy-deep);
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list a {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .hero h1 {
    font-size: 32px;
  }

  .grid-2,
  .grid-3,
  .grid-4,
  .step-list,
  .footer-grid,
  .case-block {
    grid-template-columns: 1fr;
  }

  .stat-list {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 72px 0 64px;
  }

  .hero h1 {
    font-size: 26px;
    letter-spacing: 0.1em;
  }

  .btn-ghost {
    margin: 12px 0 0;
  }

  .section {
    padding: 56px 0;
  }

  .stat-list {
    grid-template-columns: 1fr;
  }
}