/* ===== Reset & Base ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: #818cf8; text-decoration: none; transition: color 0.2s; }
a:hover { color: #a5b4fc; }

/* ===== Header ===== */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: #1e293b;
  border-bottom: 1px solid #334155;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #f1f5f9;
}
.site-title a { color: inherit; }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #e2e8f0;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.25rem;
}
.site-nav { display: flex; gap: 1.5rem; }
.site-nav a {
  color: #94a3b8;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.site-nav a:hover,
.site-nav a.active {
  color: #e2e8f0;
  border-bottom-color: #818cf8;
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #1e293b;
    border-bottom: 1px solid #334155;
    padding: 1rem 2rem;
    gap: 0.75rem;
  }
  .site-nav.open { display: flex; }
}

/* ===== Main content ===== */
.main { flex: 1; padding: 2rem; max-width: 800px; width: 100%; margin: 0 auto; }

/* ===== Home card ===== */
.home-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.card {
  background: #1e293b;
  border-radius: 16px;
  padding: 3rem;
  max-width: 480px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}
.card h1 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.card .role { color: #94a3b8; margin-bottom: 1.5rem; }
.card .bio { color: #cbd5e1; line-height: 1.8; margin-bottom: 2rem; font-size: 0.95rem; }
.card .links { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.card .links a {
  padding: 0.5rem 1rem;
  border: 1px solid #334155;
  border-radius: 8px;
  font-size: 0.9rem;
}
.card .links a:hover { background: #334155; border-color: #818cf8; }

/* ===== Article list ===== */
.article-list { list-style: none; display: flex; flex-direction: column; gap: 1rem; }
.article-list li a {
  display: block;
  background: #1e293b;
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid #334155;
  transition: all 0.2s;
}
.article-list li a:hover { border-color: #818cf8; background: #253348; }
.article-list .article-title { font-size: 1.1rem; color: #f1f5f9; margin-bottom: 0.5rem; }
.article-list .article-date { font-size: 0.85rem; color: #64748b; }
.article-list .article-summary { font-size: 0.9rem; color: #94a3b8; margin-top: 0.5rem; }

/* ===== Article page ===== */
.article { line-height: 1.9; }
.article h1 { font-size: 1.6rem; margin-bottom: 0.5rem; }
.article .meta { color: #64748b; font-size: 0.85rem; margin-bottom: 2rem; }
.article h2 { font-size: 1.25rem; margin: 2rem 0 0.75rem; color: #f1f5f9; border-bottom: 1px solid #334155; padding-bottom: 0.4rem; }
.article h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; color: #e2e8f0; }
.article p { margin-bottom: 1rem; color: #cbd5e1; }
.article ul, .article ol { margin: 0 0 1rem 1.5rem; color: #cbd5e1; }
.article li { margin-bottom: 0.4rem; }
.article code {
  background: #334155;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}
.article pre {
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1rem;
}
.article pre code { background: none; padding: 0; }
.article strong { color: #f1f5f9; }

/* ===== Footer ===== */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: #475569;
  font-size: 0.85rem;
  border-top: 1px solid #1e293b;
}