body {
  background-color: #0e0b1d;
  color: #eaeaea;
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background-color: rgba(20, 15, 35, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 6px 24px rgba(168, 85, 247, 0.2);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.header select {
  background-color: #342355;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.3rem 0.6rem;
  font-size: 0.875rem;
  transition: all 0.3s ease;
  box-shadow: inset 0 0 0 transparent;
}

.header select:hover {
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.6);
  border: 1px solid #a855f7;
  background-color: #3b2960;
}

.header select:focus {
  outline: none;
  box-shadow: 0 0 0 0.2rem rgba(168, 85, 247, 0.45);
}

.nav-links a {
  margin-right: 1.25rem;
  font-size: 1rem;
  font-weight: bold !important; /* Tô đậm */
  color: #a855f7 !important;     /* Màu tím */
  text-decoration: none !important;
  transition: color 0.3s ease, text-shadow 0.3s ease;
}

.nav-links a:last-child {
  margin-right: 0;
}

.nav-links a:hover {
  color: #c084fc !important;
  text-shadow: 0 0 6px rgba(168, 85, 247, 0.6) !important;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  line-height: 1.7;
}

h1,
h2 {
  color: #c084fc;
}

h1 {
  border-bottom: 2px solid #342355;
  padding-bottom: 10px;
}

ul {
  padding-left: 20px;
}

a {
  color: #a855f7;
}

/* ============================
   FOOTER
   ============================ */
.footer {
  margin-top: 1.5rem;
  background: linear-gradient(180deg, #1a1333 0%, #0e0b1d 100%);
  padding: 2.5rem 2rem 1.5rem;
  color: #d1c5f9;
  border-top: 1px solid rgba(168, 85, 247, 0.3);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.footer-brand img {
  width: 50px;
  height: 50px;
  margin-bottom: 0.75rem;
}

.footer-brand h3 {
  color: #facc15;
  margin: 0 0 0.3rem 0;
}

.footer-brand p {
  font-size: 0.9rem;
  opacity: 0.85;
}

.footer-links,
.footer-legal,
.footer-social {
  min-width: 150px;
}

.footer-links h4,
.footer-legal h4,
.footer-social h4 {
  font-size: 1rem;
  font-weight: bold;
  color: #c084fc;
  margin-bottom: 0.75rem;
}

.footer-links a,
.footer-legal a {
  display: block;
  color: #e5e7eb;
  text-decoration: none;
  margin-bottom: 0.35rem;
  transition: color 0.25s ease;
}

.footer-links a:hover,
.footer-legal a:hover {
  color: #facc15;
}

.social-icons a {
  color: #facc15;
  font-size: 1.4rem;
  margin-right: 0.6rem;
  transition: opacity 0.25s ease, transform 0.25s ease;
  text-decoration: none;
}

.social-icons a:hover {
  opacity: 0.8;
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid rgba(168, 85, 247, 0.3);
  text-align: center;
  padding-top: 1rem;
  opacity: 0.7;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .footer-top {
    flex-direction: column;
    text-align: center;
  }

  .footer-brand img {
    margin: 0 auto 1rem auto;
  }

  .social-icons {
    justify-content: center;
    display: flex;
  }
}