* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  min-height: 100vh;
  background: #fafafa;
  color: #333;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
}

/* ===== 引导页 ===== */
.navi { text-align: center; }

.navi-title {
  font-size: 44px;
  font-weight: 600;
  letter-spacing: 10px;
  color: #222;
  margin-bottom: 44px;
}

.navi-btn {
  display: inline-block;
  padding: 13px 36px;
  border-radius: 6px;
  background: #222;
  color: #fafafa;
  text-decoration: none;
  font-size: 15px;
  letter-spacing: 2px;
  transition: all .2s ease;
}

.navi-btn:hover {
  background: #555;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .15);
}

.navi-mail {
  display: block;
  margin-top: 26px;
  color: #888;
  font-size: 14px;
  letter-spacing: 1px;
  text-decoration: none;
  transition: color .2s;
}

.navi-mail:hover { color: #222; text-decoration: underline; }

.navi-foot {
  margin-top: 80px;
  color: #bbb;
  font-size: 13px;
  letter-spacing: 1px;
}

/* ===== 文章页(备用) ===== */
.post { max-width: 640px; width: 100%; }
.post-title { font-size: 26px; margin-bottom: 8px; }
.post-date { color: #999; font-size: 13px; }
.post-content { margin-top: 24px; line-height: 1.9; font-size: 15px; }
.post-content img { max-width: 100%; height: auto; border-radius: 6px; }