*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
  color: #222;
  background: #fafafa;
}

.hero {
  text-align: center;
  padding: 1.5rem 1rem 2rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(180deg, #e8f5e9 0%, #fafafa 100%);
  border-radius: 12px;
}

.app-icon {
  display: block;
  margin: 0 auto 1rem;
  border-radius: 22%;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.hero h1 {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

.hero-tagline {
  font-size: 1.05rem;
  font-weight: 600;
  color: #2e7d32;
  margin: 0;
}

.hero-tagline-en {
  font-size: 0.95rem;
  color: #555;
  margin: 0.35rem 0 0;
}

.hero-platform {
  display: inline-block;
  margin: 1rem 0 0;
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #1b5e20;
  background: #c8e6c9;
  border-radius: 999px;
}

.content-section {
  margin-top: 2rem;
}

.content-section h2:first-child {
  margin-top: 0;
}

.feature-list li {
  margin: 0.5rem 0;
}

.contact-section {
  padding: 1.25rem 1rem;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.developer-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
}

.contact-email {
  margin: 0.5rem 0 1.5rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.contact-email a {
  word-break: break-all;
}

.site-header {
  padding: 1.5rem 0 1rem;
  border-bottom: 1px solid #ddd;
  margin-bottom: 1.5rem;
}

.site-header a {
  color: inherit;
  text-decoration: none;
}

.site-header a:hover {
  text-decoration: underline;
}

.app-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.app-subtitle {
  font-size: 0.9rem;
  color: #555;
  margin: 0.25rem 0 0;
}

main h1 {
  font-size: 1.4rem;
  margin-top: 0;
}

main h2 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  border-bottom: 1px solid #ccc;
  padding-bottom: 0.25rem;
}

.lang-divider {
  margin: 2rem 0;
  border: none;
  border-top: 1px solid #ccc;
}

a {
  color: #1a5fb4;
}

a:hover {
  color: #0d3d7a;
}

ul {
  padding-left: 1.25rem;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.link-list li {
  margin: 0.75rem 0;
}

.link-list a {
  display: block;
  padding: 0.85rem 1rem;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

.link-list a:hover {
  border-color: #1a5fb4;
  background: #f0f6ff;
}

.credits-block {
  white-space: pre-line;
}

.site-footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  font-size: 0.85rem;
  color: #555;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
}

.footer-nav a {
  color: #555;
}

.footer-nav a:hover {
  color: #1a5fb4;
}