/* ==============================
   AI168 • ABOUT SECTION
================================ */
.about-ai168-wrapper {
    background: linear-gradient(135deg, #f6f9ff 0%, #edf2ff 45%, #e7f2ff 100%);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

/* VÒNG TRÒN TRANG TRÍ PHONG CÁCH AI */
.about-ai168-wrapper::before,
.about-ai168-wrapper::after {
    content: "";
    position: absolute;
    width: 420px; height: 420px;
    border-radius: 50%;
    background: radial-gradient(circle, #007bff22 0%, transparent 70%);
    z-index: 0;
}
.about-ai168-wrapper::before {
    top: -120px; right: -80px;
}
.about-ai168-wrapper::after {
    bottom: -140px; left: -100px;
}

/* IMAGE GROUP */
.about-photo-group {
    position: relative;
    display: inline-block;
    z-index: 2;
    perspective: 1000px;
}
.photo-main {
    width: 480px;
    border-radius: 24px;
    background: #fff;
    box-shadow: 0 25px 55px rgba(0,0,0,0.20);
    transition: .45s ease;
}
.photo-small {
    position: absolute;
    width: 160px;
    border-radius: 20px;
    box-shadow: 0 18px 45px rgba(0,0,0,0.18);
    transition: .4s ease;
}
.photo-top { top: -40px; right: -40px; }
.photo-bottom { bottom: -40px; left: -40px; }

/* Hover: nổi khối 3D */
.about-photo-group:hover .photo-main {
    transform: translateZ(28px) scale(1.05);
}
.about-photo-group:hover .photo-small {
    transform: translateY(-6px) scale(1.08);
}

/* TEXT */
.about-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 1.28;
    color: #0a1730;
}
.about-subtitle {
    text-transform: uppercase;
    font-size: 14px;
    font-weight: 700;
    color: #0072ff;
    letter-spacing: 1.5px;
}
.about-highlight {
    margin-top: 20px;
    font-size: 18px;
    color: #4e5a6c;
    border-left: 4px solid #007aff;
    padding-left: 14px;
}
.text-primary-strong {
    color: #0073ff;
    font-weight: 800;
}

/* FEATURE CARD */
.feature-card {
    background: #ffffff;
    padding: 20px 24px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.4);
    box-shadow: 0 8px 20px rgba(0, 105, 255, 0.10);
    transition: .32s ease;
}
.feature-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 20px 45px rgba(0,105,255,0.18);
}
.icon-box {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: linear-gradient(135deg, #0057e7, #00b6ff);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 19px;
    margin-bottom: 12px;
}

/* FadeUp Animation */
.fadeUp {
  opacity: 0;
  transform: translateY(90px);
  transition: all 2.2s cubic-bezier(0.15, 0.85, 0.25, 1.10);
}
.fadeUp.active {
  opacity: 1;
  transform: translateY(0);
}

/* ==============================
   RESPONSIVE
================================ */
@media (max-width: 991px) {
    .photo-main { width: 360px; }
    .about-title { font-size: 36px; }
    .photo-top { top: -25px; right: -20px; }
    .photo-bottom { bottom: -25px; left: -20px; }
}
@media (max-width: 575px) {
    .about-ai168-wrapper { padding: 70px 0; }
    .about-photo-group { width: 100%; }
    .photo-main { width: 100%; }
    .photo-top, .photo-bottom { display: none; }
}