:root {
  --color-bg: #f5f7f6;
  --color-text: #1c2b2a;
  --color-accent: #0b7285;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Hiragino Sans", "Yu Gothic", "Segoe UI", system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

.site-header {
  position: relative;
  padding: 3rem 1rem 1.5rem;
  text-align: center;
}

.lang-toggle {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: #fff;
  border: 1px solid #cdd7d5;
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  font-size: 0.78rem;
  color: var(--color-accent);
  cursor: pointer;
}

.site-header h1 {
  margin: 0 0 0.4rem;
  font-size: 1.8rem;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  color: #4b5f5c;
  font-size: 0.95rem;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

h2 {
  font-size: 1.05rem;
  color: #334;
  margin: 2rem 0 0.75rem;
}

.project-card {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: #fff;
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s ease;
}

.project-card:last-child {
  margin-bottom: 0;
}

.project-card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.14);
}

.project-icon {
  font-size: 1.8rem;
  line-height: 1;
}

.project-body h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  color: var(--color-text);
}

.project-body p {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  color: #445;
}

.project-link {
  display: flex;
  gap: 0.9rem;
  font-size: 0.82rem;
  color: var(--color-accent);
  font-weight: bold;
}

.project-link a {
  color: inherit;
}

.about {
  font-size: 0.88rem;
  color: #445;
}

.about a {
  color: var(--color-accent);
}

.site-footer {
  text-align: center;
  font-size: 0.8rem;
  color: #778;
  padding: 1.5rem 1rem;
}

.site-footer a {
  color: inherit;
}