:root {
  --primary-color: #75050e;
  --secondary-color: #FFFFFF;
  --text-color: #333333;
  --font: 'Noto Sans JP', sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: var(--font); color: var(--text-color); background: var(--secondary-color); line-height: 1.6; }
.container { width: 90%; max-width: 1000px; margin: auto; padding: 2rem 0; }
header { background: var(--secondary-color); box-shadow: 0 2px 4px rgba(0,0,0,0.1); position: fixed; width: 100%; top: 0; z-index: 100; }
header .container { display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 700; color: var(--primary-color); font-size: 1.5rem; }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; }
.nav-list { list-style: none; display: flex; }
.nav-list li { margin-left: 1.5rem; }
.nav-list a { text-decoration: none; color: var(--text-color); font-weight: 500; }
#hero { background: var(--primary-color); color: var(--secondary-color); height: 60vh; display: flex; align-items: center; justify-content: center; margin-top: 60px; }
.hero-content { text-align: center; }
#about, #works, #contact { margin-top: 4rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; }
.card { background: var(--secondary-color); border: 2px solid var(--primary-color); padding: 1rem; text-align: center; border-radius: 8px; }
footer { text-align: center; padding: 1rem 0; background: var(--secondary-color); margin-top: 4rem; border-top: 2px solid #ddd; position: relative; bottom: 0; width: 100%; }

@media (max-width: 768px) {
  .nav-list { display: none; flex-direction: column; background: var(--secondary-color); position: absolute; top: 100%; left: 0; right: 0; }
  .nav-list.show { display: flex; }
  .nav-toggle { display: block; }
  .hamburger { width: 25px; height: 3px; background: var(--text-color); display: block; position: relative; }
  .hamburger::after, .hamburger::before { content: ''; width: 25px; height: 3px; background: var(--text-color); position: absolute; left: 0; }
  .hamburger::before { top: -8px; }
  .hamburger::after { top: 8px; }
}

/* Blog-specific */
.post-date {
  color: #777;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Blog two-column layout */
.content{
  flex: 1 1 auto;
}

.content-area {
  display: flex;
  gap: 1rem;
  height: calc(100vh - 240px);
  margin-top: 100px;
}
.sidebar {
  flex: 0 0 240px;
}
.sidebar-list {
  list-style: none;
  padding: 0;
}
.sidebar-list li {
  margin-bottom: 0.75rem;
}
.sidebar-list li a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
}
.content iframe {
  flex: 1;
  width: 100%;
  height: calc(100vh - 245px);
  border-left: 2px solid #ddd;
  border-right: none;
  border-top: none;
  border-bottom: none;
}