.pineai-site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  width: 100%;
  padding: 14px 0 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.96) 0%, rgba(6, 8, 20, 0.78) 100%);
}

.pineai-site-header .header-inner {
  width: min(1330px, calc(100% - 24px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 78px;
  position: relative;
}

.pineai-site-header .header-left {
  display: flex;
  align-items: center;
  gap: 24px;
  min-width: 0;
  flex: 1 1 auto;
}

.pineai-site-header .brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.pineai-site-header .brand img {
  width: 128px;
  height: auto;
  display: block;
}

.pineai-site-header nav {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.pineai-site-header nav ul {
  list-style: none;
  margin: 0;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-radius: 999px;
  background: rgba(14, 16, 28, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.28);
}

.pineai-site-header nav li {
  margin: 0;
}

.pineai-site-header nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border-radius: 999px;
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: background-color 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.pineai-site-header nav a:hover {
  background: rgba(255, 255, 255, 0.08);
  opacity: 1;
}

.pineai-site-header .header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 18px;
  flex-shrink: 0;
  margin-left: auto;
}

.pineai-site-header .theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 18px 34px;
  border-radius: 14px;
  background: linear-gradient(180deg, #7d72ff 0%, #6458f2 100%);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 14px 28px rgba(101, 88, 242, 0.28);
}

.pineai-site-header .sidebar__toggle {
  display: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

@media (max-width: 1100px) {
  .pineai-site-header nav {
    position: static;
    transform: none;
    margin-left: auto;
    margin-right: auto;
  }

  .pineai-site-header .header-inner {
    flex-wrap: wrap;
    justify-content: center;
    padding-bottom: 10px;
  }

  .pineai-site-header .header-right {
    width: 100%;
  }
}

@media (max-width: 767px) {
  .pineai-site-header {
    padding-top: 10px;
  }

  .pineai-site-header .header-inner {
    width: min(100% - 16px, 1330px);
    gap: 12px;
  }

  .pineai-site-header .header-left {
    width: 100%;
    flex-wrap: wrap;
    justify-content: space-between;
  }

  .pineai-site-header nav {
    width: 100%;
    margin-top: 4px;
  }

  .pineai-site-header nav ul {
    width: 100%;
    justify-content: center;
    gap: 8px;
    padding: 8px;
  }

  .pineai-site-header nav a {
    font-size: 14px;
    padding: 10px 14px;
  }

  .pineai-site-header .brand img {
    width: 108px;
  }

  .pineai-site-header .theme-btn {
    padding: 14px 18px;
    font-size: 15px;
  }
}