/* Refs box (nổi bật trên nền ảnh) */
.refs-box {
  margin: 28px auto 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(6px);
  padding: 22px;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.6);
  text-align: left;
}
.refs-box h2 {
  margin: 0 0 12px 0;
  font-size: 1.25rem;
  color: #ffd97a;
}
.refs-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.refs-list li {
  padding: 10px 12px;
  background: rgba(255,255,255,0.03);
  border-left: 4px solid rgba(212,175,55,0.95);
  border-radius: 8px;
  transition: transform 0.2s ease, background 0.2s ease;
}
.refs-list li:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.06);
}
.refs-list strong { display:block; color:#fff; margin-bottom:4px; font-weight:700; }
.refs-list a {
  color: #ffd97a;
  text-decoration: underline;
  word-break: break-all;
}
.refs-note {
  margin-top: 10px;
  color: #e0d9c2;
  font-size: 0.95rem;
}

/* =============================
   MOBILE OPTIMIZATION - NGUON
   ============================= */

/* Tablet */
@media (max-width: 992px) {
  .refs-section {
    padding: 60px 5%;
  }

  .refs-box {
    padding: 20px;
    margin: 25px auto 0;
  }

  .refs-box h2 {
    font-size: 1.2rem;
  }

  .refs-list {
    gap: 10px;
  }

  .refs-list li {
    padding: 10px;
  }

  .refs-list strong {
    font-size: 0.95rem;
  }

  .refs-list a {
    font-size: 0.9rem;
  }

  .refs-note {
    font-size: 0.9rem;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .refs-section {
    padding: 50px 4%;
  }

  .refs-box {
    padding: 18px;
    margin: 20px auto 0;
    border-radius: 10px;
  }

  .refs-box h2 {
    font-size: 1.15rem;
    margin-bottom: 15px;
  }

  .refs-list {
    gap: 10px;
  }

  .refs-list li {
    padding: 10px 12px;
    border-left-width: 3px;
    border-radius: 6px;
  }

  .refs-list strong {
    font-size: 0.9rem;
    margin-bottom: 5px;
  }

  .refs-list a {
    font-size: 0.85rem;
    line-height: 1.5;
  }

  .refs-note {
    font-size: 0.85rem;
    margin-top: 12px;
  }

  /* Hero section cho nguon page */
  .hero-section {
    padding: 120px 15px 60px;
    min-height: 500px;
  }

  .hero-inner {
    padding: 0 10px;
  }

  .hero-inner h1 {
    font-size: clamp(2rem, 8vw, 3.5rem);
  }

  .hero-subtitle {
    font-size: 0.85rem;
    letter-spacing: 1.5px;
  }
}

/* Mobile nhỏ */
@media (max-width: 576px) {
  .refs-section {
    padding: 40px 3%;
  }

  .refs-box {
    padding: 15px;
    margin: 18px auto 0;
    border-radius: 8px;
  }

  .refs-box h2 {
    font-size: 1.05rem;
    margin-bottom: 12px;
  }

  .refs-list {
    gap: 8px;
  }

  .refs-list li {
    padding: 8px 10px;
    border-left-width: 3px;
  }

  .refs-list strong {
    font-size: 0.85rem;
    margin-bottom: 4px;
  }

  .refs-list a {
    font-size: 0.8rem;
    line-height: 1.4;
    word-break: break-word;
  }

  .refs-note {
    font-size: 0.8rem;
    margin-top: 10px;
    line-height: 1.5;
  }

  /* Hero section compact */
  .hero-section {
    padding: 100px 10px 50px;
    min-height: 450px;
  }

  .hero-inner h1 {
    font-size: clamp(1.8rem, 10vw, 2.5rem);
  }

  .hero-subtitle {
    font-size: 0.75rem;
    letter-spacing: 1px;
  }
}

/* Touch optimization */
@media (hover: none) and (pointer: coarse) {
  /* Links touch-friendly */
  .refs-list a {
    display: inline-block;
    padding: 4px 0;
    min-height: 24px;
  }

  /* Disable hover effects */
  .refs-list li:hover {
    transform: none;
  }

  .refs-list li:active {
    transform: translateY(-1px);
    background: rgba(255, 255, 255, 0.08);
  }
}