:root {
  --primary: #84A98C;
  --primary-dark: #5E7A64;
  --primary-light: #A8C4AF;
  --bg: #FFFFFF;
  --surface: #F7F9F8;
  --text-main: #1A202C;
  --text-sub: #718096;
  --border: #E2E8F0;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text-main);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  overflow: hidden;
}

.logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.logo-text {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  gap: 0.25rem;
}

.nav a {
  padding: 0.5rem 1rem;
  text-decoration: none;
  color: var(--text-sub);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.2s ease;
}

.nav a:hover {
  color: var(--primary-dark);
  background: var(--surface);
}

.nav a.active {
  color: var(--primary-dark);
  background: rgba(132, 169, 140, 0.12);
}

/* Hero */
.hero {
  background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero .subtitle {
  color: var(--text-sub);
  font-size: 0.95rem;
}

.hero .updated {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding: 0.5rem 1rem;
  background: white;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--text-sub);
}

.hero .updated::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
}

/* Main Content */
.main {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.section {
  margin-bottom: 3rem;
}

.section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}

.section p {
  color: var(--text-main);
  margin-bottom: 1rem;
}

.section ul {
  list-style: none;
  margin: 1rem 0;
}

.section li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.section li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
}

/* Highlight Box */
.highlight-box {
  background: var(--surface);
  border-left: 4px solid var(--primary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 12px 12px 0;
  margin: 1.5rem 0;
}

.highlight-box p {
  margin: 0;
  font-weight: 500;
}

/* Info Box */
.info-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.info-box p {
  margin: 0;
}

.info-box ul {
  margin: 0.5rem 0 0 0;
}

/* Contact Section */
.contact-section {
  text-align: center;
  padding: 3rem 0;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
}

.contact-section h2 {
  border: none;
  padding: 0;
  margin-bottom: 0.75rem;
}

.contact-section p {
  color: var(--text-sub);
  margin-bottom: 1.5rem;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 600;
  border-radius: 12px;
  transition: all 0.2s ease;
}

.contact-btn:hover {
  background: var(--primary-dark);
}

.contact-btn svg {
  width: 18px;
  height: 18px;
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
}

.footer-inner {
  max-width: 800px;
  margin: 0 auto;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  color: var(--text-main);
}

.footer-logo .logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  overflow: hidden;
}

.footer-logo .logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.footer-logo span {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 600;
  font-size: 1rem;
}

.footer p {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 0.5rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 1rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-sub);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary-dark);
}

/* Mobile */
@media (max-width: 600px) {
  .header-inner {
    padding: 0.875rem 1rem;
  }

  .nav a {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
  }

  .hero {
    padding: 3rem 1rem 2rem;
  }

  .hero h1 {
    font-size: 1.625rem;
  }

  .main {
    padding: 1.5rem 1rem 3rem;
  }

  .section h2 {
    font-size: 1.125rem;
  }
}