/* === style.css の中身 === */

:root {
  --background-color: #fafafa;
  --text-color: #333333;
  --header-color: #1a1a1a;
  --border-color: #dddddd;
  --accent-color: #4caf50;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  font-family:
    system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
}

main {
  width: min(100% - 40px, 800px);
  flex: 1;
  margin: 0 auto;
  padding: 40px 0;
}

.site-header {
  background-color: var(--header-color);
}

.header-container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: min(100% - 40px, 1200px);
  margin: 0 auto;
  padding: 15px 0;
}

.site-name {
  margin: 0;
  color: #ffffff;
  font-size: 1.25rem;
  font-weight: 700;
}

.navigation-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.navigation-list a {
  color: #cccccc;
  text-decoration: none;
}

.navigation-list a:hover,
.navigation-list a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
}

h1 {
  margin-top: 0;
  text-align: center;
}

h2 {
  margin-top: 2.5rem;
}

.accent-line {
  width: min(100%, 420px);
  height: 6px;
  margin: 25px auto;
  background-color: var(--accent-color);
}

.welcome-message {
  width: min(100%, 300px);
  margin: 30px auto;
  padding: 8px 0;
  overflow: hidden;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  background-color: #ffffff;
  white-space: nowrap;
}

.welcome-message__text {
  display: inline-block;
  padding-left: 100%;
  font-weight: 700;
  animation: marquee 10s linear infinite;
}

@keyframes marquee {
  to {
    transform: translateX(-100%);
  }
}

footer {
  padding: 20px;
  color: #666666;
  font-size: 0.875rem;
  text-align: center;
}

footer p {
  margin: 0;
}

@media (prefers-reduced-motion: reduce) {
  .welcome-message__text {
    padding-left: 0;
    animation: none;
  }
}

@media (max-width: 600px) {
  .header-container {
    justify-content: center;
    text-align: center;
  }

  .navigation-list {
    justify-content: center;
  }
}