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

html{
  scroll-behavior:smooth;
}

body{
  font-family:'Be Vietnam Pro', sans-serif;
  color:#16324f;
  background:
    radial-gradient(circle at 10% 20%, rgba(120, 200, 255, 0.25), transparent 25%),
    radial-gradient(circle at 90% 10%, rgba(90, 150, 255, 0.18), transparent 30%),
    radial-gradient(circle at 50% 90%, rgba(120, 200, 255, 0.15), transparent 25%),
    linear-gradient(180deg, #f7fbff 0%, #eef7ff 50%, #f9fcff 100%);
  overflow-x:hidden;
  position:relative;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  pointer-events:none;
  z-index:-1;

  background-image:
    linear-gradient(rgba(255,255,255,0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.4) 1px, transparent 1px);

  background-size:40px 40px;
  opacity:0.4;
}

body::after{
  content:"";
  position:fixed;
  width:min(280px, 70vw);
  height:min(280px, 70vw);
  background:radial-gradient(circle, rgba(106,182,240,0.25), transparent 70%);
  top:30%;
  left:50%;
  transform:translateX(-50%);
  filter:blur(60px);
  pointer-events:none;
  z-index:-1;
}

img{
  max-width:100%;
  display:block;
  transition:transform 0.5s ease, filter 0.4s ease;
}

a{
  text-decoration:none;
  color:inherit;
}

.container{
  width:min(1180px, calc(100% - 32px));
  margin:0 auto;
}
/* ================= HEADER ================= */
.site-header{
  position:sticky;
  top:0;
  z-index:999;
  background:rgba(255,255,255,0.92);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(78, 143, 233, 0.10);
  box-shadow:0 8px 30px rgba(42, 89, 148, 0.06);
}

.header-inner{
  min-height:88px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}

.site-logo{
  flex-shrink:0;
}

.site-logo img{
  width:120px;
  height:auto;
}

.site-nav{
  display:flex;
  align-items:center;
  gap:16px;   /* giảm từ 20+ xuống */
}
.site-nav > a,
.nav-link{
  display:flex;
  align-items:center;
  gap:6px;

  font-size:13px;       /* nhỏ lại */
  font-weight:600;      /* nhẹ hơn */
  letter-spacing:0.3px; /* gọn chữ */

  color:#2b4666;
  position:relative;
  padding:8px 0;

  transition:0.25s ease;
}
.site-nav > a::after,
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:2px;
  border-radius:999px;
  background:linear-gradient(90deg, #6ab6f0, #2d63c8);
  transition:width 0.3s ease;
}

.site-nav > a:hover,
.nav-link:hover{
  color:#2d63c8;
}

.site-nav > a:hover::after,
.nav-link:hover::after{
  width:100%;
}

.nav-dropdown{
  position:relative;
}

.nav-link i{
  font-size:12px;
  transition:transform 0.25s ease;
}

.nav-dropdown:hover .nav-link i{
  transform:rotate(180deg);
}
.dropdown-menu{
  min-width:220px;
  padding:10px;
}

.dropdown-menu a{
  font-size:13px;
  padding:10px 12px;
}
.dropdown-menu{
  position:absolute;
  top:100%;
  left:0;
  min-width:250px;
  background:#fff;
  border-radius:18px;
  padding:12px;
  border:1px solid rgba(90, 153, 255, 0.14);
  box-shadow:0 20px 40px rgba(53, 96, 158, 0.12);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:0.28s ease;
}

.dropdown-menu a{
  display:block;
  padding:12px 14px;
  border-radius:12px;
  color:#45617f;
  font-size:14px;
  font-weight:500;
  transition:0.25s ease;
}

.dropdown-menu a:hover{
  background:linear-gradient(135deg, rgba(106,182,240,0.12), rgba(45,99,200,0.06));
  color:#2d63c8;
  transform:translateX(4px);
}

.nav-dropdown:hover .dropdown-menu{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

/* mobile button */
.menu-toggle{
  display:none;
  width:46px;
  height:46px;
  border:none;
  border-radius:14px;
  background:#fff;
  box-shadow:0 10px 20px rgba(52, 98, 180, 0.10);
  cursor:pointer;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
}

.menu-toggle span{
  width:22px;
  height:2px;
  background:#1e426d;
  border-radius:999px;
  transition:0.3s ease;
}

.menu-toggle.active span:nth-child(1){
  transform:translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2){
  opacity:0;
}

.menu-toggle.active span:nth-child(3){
  transform:translateY(-7px) rotate(-45deg);
}

/* wrapper */
.header-cta{
  display:flex;
  align-items:center;
}

/* button */
.cta-btn{
  display:inline-flex;
  align-items:center;
  gap:6px;

  padding:10px 20px;
  border-radius:999px;

  font-size:13px;
  font-weight:600;

  color:#2d63c8;
  background:#fff;

  border:1px solid rgba(45,99,200,0.25);

  text-decoration:none; /* QUAN TRỌNG */
  white-space:nowrap;

  transition:all 0.25s ease;
}

/* hover */
.cta-btn:hover{
  background:#2d63c8;
  color:#fff;
  border-color:#2d63c8;
}

/* icon */
.cta-btn i{
  font-size:12px;
  transition:transform 0.25s ease;
}

.cta-btn:hover i{
  transform:translateX(3px);
}

/* chống dính underline từ nav */
.cta-btn::after{
  display:none !important;
}


/* mobile menu */
.mobile-menu{
  display:none;
  padding:0 16px 18px;
  flex-direction:column;
  gap:12px;
}

.mobile-menu > a,
.mobile-sub-toggle{
  width:100%;
  min-height:50px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 16px;
  border:none;
  border-radius:14px;
  background:#fff;
  color:#27496c;
  font-size:14px;
  font-weight:700;
  box-shadow:0 10px 20px rgba(82, 121, 182, 0.06);
  border:1px solid rgba(90, 153, 255, 0.12);
}

.mobile-sub-toggle{
  cursor:pointer;
  font-family:inherit;
}

.mobile-sub-toggle i{
  transition:transform 0.3s ease;
}

.mobile-group.active .mobile-sub-toggle i{
  transform:rotate(180deg);
}

.mobile-submenu{
  display:none;
  padding-top:8px;
  gap:8px;
  flex-direction:column;
}

.mobile-submenu a{
  display:block;
  padding:12px 16px;
  border-radius:12px;
  background:rgba(255,255,255,0.85);
  border:1px solid rgba(90, 153, 255, 0.10);
  color:#4a6786;
  font-size:14px;
}

.mobile-group.active .mobile-submenu{
  display:flex;
}

.mobile-menu.active{
  display:flex;
}

.nav-toggle-label{
  background:none;
  border:none;
  outline:none;
  cursor:pointer;
  font-family:inherit;
}

.nav-toggle-label:focus{
  outline:none;
  box-shadow:none;
}

.mobile-sub-toggle{
  font-family:inherit;
}


/* ===== Desktop submenu cấp 2 cho Gia sư môn học ===== */
.tutor-dropdown-menu{
  min-width:260px;
}

.dropdown-subgroup{
  position:relative;
}

.dropdown-subtoggle{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 14px;
  border:none;
  background:transparent;
  border-radius:12px;
  color:#45617f;
  font-size:14px;
  font-weight:500;
  font-family:inherit;
  cursor:pointer;
  transition:0.25s ease;
}

.dropdown-subtoggle:hover{
  background:linear-gradient(135deg, rgba(106,182,240,0.12), rgba(45,99,200,0.06));
  color:#2d63c8;
}

.dropdown-subtoggle i{
  font-size:12px;
  transition:0.25s ease;
}

.dropdown-subgroup:hover .dropdown-subtoggle i{
  transform:translateX(2px);
}

.dropdown-submenu{
  position:absolute;
  top:0;
  left:100%;
  min-width:200px;
  background:#fff;
  border-radius:18px;
  padding:12px;
  border:1px solid rgba(90, 153, 255, 0.14);
  box-shadow:0 20px 40px rgba(53, 96, 158, 0.12);
  opacity:0;
  visibility:hidden;
  transform:translateX(12px);
  transition:0.28s ease;
  z-index:20;
}

.dropdown-submenu a{
  display:block;
  padding:12px 14px;
  border-radius:12px;
  color:#45617f;
  font-size:14px;
  font-weight:500;
  transition:0.25s ease;
}

.dropdown-submenu a:hover{
  background:linear-gradient(135deg, rgba(106,182,240,0.12), rgba(45,99,200,0.06));
  color:#2d63c8;
  transform:translateX(4px);
}

.dropdown-subgroup:hover .dropdown-submenu{
  opacity:1;
  visibility:visible;
  transform:translateX(0);
}

/* ===== Mobile submenu cấp 2 ===== */
.mobile-nested-group{
  display:flex;
  flex-direction:column;
  gap:8px;
}

.mobile-nested-toggle{
  width:100%;
  min-height:46px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:0 14px;
  border:none;
  border-radius:12px;
  background:rgba(255,255,255,0.88);
  border:1px solid rgba(90, 153, 255, 0.10);
  color:#4a6786;
  font-size:14px;
  font-weight:600;
  font-family:inherit;
  cursor:pointer;
}

.mobile-nested-toggle i{
  transition:0.3s ease;
}

.mobile-nested-submenu{
  display:none;
  flex-direction:column;
  gap:8px;
  padding-left:10px;
}

.mobile-nested-submenu a{
  display:block;
  padding:12px 14px;
  border-radius:12px;
  background:rgba(255,255,255,0.82);
  border:1px solid rgba(90, 153, 255, 0.10);
  color:#4a6786;
  font-size:14px;
}

.mobile-nested-group.active .mobile-nested-submenu{
  display:flex;
}

.mobile-nested-group.active .mobile-nested-toggle i{
  transform:rotate(180deg);
}
/* ================= RESPONSIVE ================= */
@media (max-width: 1100px){
  .site-nav{
    gap:14px;
  }

  .site-nav > a,
  .nav-link{
    font-size:13px;
  }

  .dropdown-menu{
    min-width:220px;
  }
}

@media (max-width: 920px){
  .site-nav{
    display:none;
  }

  .menu-toggle{
    display:flex;
  }

  .header-inner{
    min-height:76px;
  }

  .site-logo img{
    width:140px;
  }
}

@media (max-width: 480px){
  .container{
    width:min(1180px, calc(100% - 20px));
  }

  .site-logo img{
    width:128px;
  }

  .menu-toggle{
    width:42px;
    height:42px;
  }
}
/* HERO */
.hero-section{
  position:relative;
  padding:72px 0 48px;
  overflow:hidden;
}

.hero-glow{
  position:absolute;
  border-radius:50%;
  filter:blur(10px);
  pointer-events:none;
}

.hero-glow-1{
  width:360px;
  height:360px;
  top:-120px;
  left:-80px;
  background:radial-gradient(circle, rgba(122, 203, 255, 0.45), transparent 70%);
}

.hero-glow-2{
  width:460px;
  height:460px;
  right:-120px;
  top:40px;
  background:radial-gradient(circle, rgba(90, 153, 255, 0.18), transparent 72%);
}

.hero-grid{
  display:grid;
  grid-template-columns:1.05fr 0.95fr;
  gap:42px;
  align-items:center;
}
.section-label{
  display:inline-block;
  padding:14px 22px; /* to hơn */
  border-radius:999px;
  background:rgba(255,255,255,0.9);
  border:1px solid rgba(90, 153, 255, 0.18);
  color:#2d63c8;
  font-size:18px; /* tăng từ 14 → 18 */
  font-weight:700;
  margin-bottom:20px;
  box-shadow:0 14px 28px rgba(86, 128, 190, 0.12);
  transition:transform 0.3s ease, box-shadow 0.3s ease;
}
.section-label:hover{
  transform:translateY(-2px);
  box-shadow:0 16px 28px rgba(86, 128, 190, 0.12);
}

.hero-content h1{
  font-size:clamp(2.3rem, 4vw, 4rem);
  line-height:1.08;
  letter-spacing:-0.03em;
  margin-bottom:16px;
}

.hero-content h2{
  font-size:1.2rem;
  color:#2d63c8;
  line-height:1.5;
  margin-bottom:22px;
  font-weight:700;
}

.hero-content > p{
  font-size:1rem;
  line-height:1.9;
  color:#4c6888;
  margin-bottom:20px;
}

.hero-list{
  display:grid;
  gap:14px;
  margin-bottom:30px;
}

.hero-list-item{
  padding:18px 20px;
  background:rgba(255,255,255,0.72);
  border:1px solid rgba(90, 153, 255, 0.12);
  border-radius:20px;
  box-shadow:0 14px 28px rgba(80, 117, 173, 0.08);
  transition:transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.hero-list-item:hover{
  transform:translateY(-6px);
  box-shadow:0 18px 34px rgba(80, 117, 173, 0.14);
  border-color:rgba(45, 99, 200, 0.22);
  background:rgba(255,255,255,0.92);
}

.hero-list-item strong{
  display:block;
  color:#18375a;
  margin-bottom:6px;
  font-size:15px;
}

.hero-list-item span{
  color:#5a7391;
  line-height:1.75;
  font-size:15px;
}

.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
}

.btn-primary,
.btn-secondary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
  padding:0 24px;
  border-radius:999px;
  font-weight:700;
  transition:transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease, filter 0.25s ease;
}

.btn-primary{
  background:linear-gradient(135deg, #6ab6f0, #2d63c8);
  color:#fff;
  box-shadow:0 14px 28px rgba(45, 99, 200, 0.18);
}

.btn-primary:hover{
  transform:translateY(-3px) scale(1.02);
  box-shadow:0 18px 34px rgba(45, 99, 200, 0.24);
  filter:brightness(1.05);
}

.btn-secondary{
  background:#fff;
  color:#2d63c8;
  border:1px solid rgba(45, 99, 200, 0.14);
}

.btn-secondary:hover{
  transform:translateY(-3px);
  background:#2d63c8;
  color:#fff;
  box-shadow:0 14px 28px rgba(45, 99, 200, 0.16);
}

.hero-visual{
  position:relative;
  min-height:620px;
}

.hero-main-image,
.hero-small-card,
.intro-image,
.trust-image{
  transition:transform 0.35s ease, box-shadow 0.35s ease;
}

.hero-main-image:hover,
.hero-small-card:hover,
.intro-image:hover,
.trust-image:hover{
  transform:translateY(-6px);
  box-shadow:0 28px 56px rgba(61, 102, 161, 0.20);
}

.hero-main-image:hover img,
.hero-small-card:hover img,
.intro-image:hover img,
.trust-image:hover img{
  transform:scale(1.05);
}

.hero-main-image{
  position:absolute;
  top:0;
  right:0;
  width:100%;
  max-width:470px;
  border-radius:34px;
  overflow:hidden;
  box-shadow:0 26px 60px rgba(61, 102, 161, 0.18);
  border:10px solid rgba(255,255,255,0.74);
  background:#fff;
}

.hero-main-image img{
  width:100%;
  height:560px;
  object-fit:cover;
}

.hero-small-card{
  position:absolute;
  width:180px;
  border-radius:24px;
  overflow:hidden;
  border:8px solid rgba(255,255,255,0.90);
  box-shadow:0 18px 36px rgba(61, 102, 161, 0.14);
  background:#fff;
}

.hero-small-card img{
  width:100%;
  height:180px;
  object-fit:cover;
}

.hero-small-card-1{
  left:10px;
  bottom:70px;
}

.hero-small-card-2{
  left:150px;
  bottom:-10px;
}


@media (max-width: 860px){
  .hero-section{
    padding:20px 0 32px;
  }

  .hero-grid{
    display:flex;
    flex-direction:column;
    gap:20px;
  }

  .hero-visual{
    order:1;
    width:100%;
    min-height:auto;
    max-width:100%;
    margin:0;
  }

  .hero-content{
    order:2;
  }

  .hero-main-image{
    position:relative;
    top:auto;
    right:auto;
    max-width:100%;
    width:100%;
    border-radius:26px;
    border:8px solid rgba(255,255,255,0.78);
    box-shadow:0 18px 40px rgba(61, 102, 161, 0.14);
  }

  .hero-main-image img{
    width:100%;
    height:240px;
    object-fit:cover;
    object-position:center;
  }

  .hero-small-card{
    width:110px;
    border-width:6px;
    border-radius:18px;
  }

  .hero-small-card img{
    height:110px;
  }

  .hero-small-card-1{
    left:8px;
    bottom:-14px;
  }

  .hero-small-card-2{
    right:8px;
    left:auto;
    bottom:-14px;
  }

  .hero-content h1{
    font-size:2rem;
    line-height:1.15;
    margin-bottom:12px;
  }

  .hero-content h2{
    font-size:1rem;
    margin-bottom:14px;
  }

  .hero-content > p{
    font-size:0.98rem;
    line-height:1.8;
    margin-bottom:16px;
  }

  .hero-list{
    gap:12px;
    margin-bottom:20px;
  }

  .hero-list-item{
    padding:16px 16px;
    border-radius:18px;
  }

  .hero-actions{
    flex-direction:column;
    gap:10px;
  }

  .btn-primary,
  .btn-secondary{
    width:100%;
  }
}

/* INTRO */
.intro-section{
  padding:40px 0 84px;
}

.intro-wrap{
  display:grid;
  grid-template-columns:0.95fr 1.05fr;
  gap:38px;
  align-items:center;
  background:rgba(255,255,255,0.62);
  border:1px solid rgba(90, 153, 255, 0.12);
  box-shadow:0 18px 40px rgba(82, 121, 182, 0.08);
  border-radius:34px;
  padding:28px;
}

.intro-image{
  border-radius:28px;
  overflow:hidden;
}

.intro-image img{
  width:100%;
  height:420px;
  object-fit:cover;
}

.intro-content h2{
  font-size:clamp(1.8rem, 3vw, 2.8rem);
  line-height:1.2;
  letter-spacing:-0.03em;
  margin-bottom:18px;
}

.intro-content p{
  color:#5b7694;
  line-height:1.9;
  font-size:1rem;
}




/* SECTION HEADING */
.section-heading{
  text-align:center;
  max-width:760px;
  margin:0 auto 32px;
}

.section-heading h2{
  font-size:clamp(1.9rem, 3vw, 2.8rem);
  line-height:1.2;
  letter-spacing:-0.03em;
}

/* FEATURES */
.features-section{
  padding:0 0 90px;
}

.feature-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:22px;
}


.feature-icon{
  width:60px;
  height:60px;
  border-radius:18px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:18px;

  font-size:22px;

  background:linear-gradient(135deg, rgba(106,182,240,0.2), rgba(45,99,200,0.1));
  color:#2d63c8;

  transition:all 0.3s ease;
}

.feature-card:hover .feature-icon{
  transform:scale(1.1) rotate(-6deg);
  background:linear-gradient(135deg, #6ab6f0, #2d63c8);
  color:#fff;
}

/* icon bên trong */
.feature-icon i{
  transition:transform 0.3s ease;
}

.feature-card:hover .feature-icon i{
  transform:scale(1.1);
}

.feature-card{
  position:relative;
  padding:30px 28px;
  background:rgba(255,255,255,0.78);
  border:1px solid rgba(90, 153, 255, 0.12);
  border-radius:28px;
  box-shadow:0 18px 36px rgba(82, 121, 182, 0.08);
  transition:transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  overflow:hidden;
}

.feature-card::before{
  content:"";
  position:absolute;
  top:0;
  left:-120%;
  width:70%;
  height:100%;
  background:linear-gradient(90deg, transparent, rgba(255,255,255,0.45), transparent);
  transform:skewX(-20deg);
  transition:left 0.7s ease;
}

.feature-card:hover{
  transform:translateY(-8px);
  box-shadow:0 24px 44px rgba(82, 121, 182, 0.14);
  border-color:rgba(45, 99, 200, 0.18);
}

.feature-card:hover::before{
  left:140%;
}

.feature-number{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:56px;
  height:56px;
  border-radius:18px;
  margin-bottom:18px;
  background:linear-gradient(135deg, rgba(106,182,240,0.18), rgba(45,99,200,0.10));
  color:#2d63c8;
  font-size:20px;
  font-weight:800;
  transition:transform 0.3s ease, background 0.3s ease, color 0.3s ease;
}

.feature-card:hover .feature-number{
  transform:scale(1.08) rotate(-4deg);
  background:linear-gradient(135deg, #6ab6f0, #2d63c8);
  color:#fff;
}

.feature-card h3{
  font-size:1.18rem;
  margin-bottom:14px;
  color:#173454;
}

.feature-card ul{
  padding-left:18px;
}

.feature-card li{
  color:#587290;
  line-height:1.85;
  margin-bottom:8px;
}

/* TRUST */
.trust-section{
  padding:0 0 90px;
}

.trust-box{
  display:grid;
  grid-template-columns:1.02fr 0.98fr;
  gap:30px;
  align-items:center;
  background:linear-gradient(135deg, #67b3ef, #2d63c8);
  border-radius:36px;
  padding:34px;
  overflow:hidden;
  box-shadow:0 30px 60px rgba(52, 98, 180, 0.20);
}

.light-label{
  background:rgba(255,255,255,0.16);
  border:1px solid rgba(255,255,255,0.16);
  color:#fff;
}

.trust-content h2{
  font-size:clamp(2rem, 3vw, 3rem);
  line-height:1.18;
  color:#fff;
  margin-bottom:16px;
}

.trust-content p{
  color:rgba(255,255,255,0.92);
  line-height:1.9;
  font-size:1rem;
}

.trust-image{
  border-radius:28px;
  overflow:hidden;
  border:8px solid rgba(255,255,255,0.18);
}

.trust-image img{
  width:100%;
  height:380px;
  object-fit:cover;
}
/* ===== FOOTER ĐẬM HƠN ===== */
.site-footer{
  margin-top:60px;
  padding-top:50px;
  background:
    radial-gradient(circle at 10% 10%, rgba(80,130,255,0.15), transparent 30%),
    linear-gradient(180deg, #0f1f3a 0%, #0a1428 100%);
  color:#c9d6ea;
}

/* layout */
.footer-inner{
  display:flex;
  justify-content:space-between;
  gap:40px;
  flex-wrap:wrap;
  padding-bottom:32px;
}

/* LOGO */
.footer-logos{
  display:flex;
  align-items:center;
  gap:18px; /* khoảng cách giữa 2 logo */
}

/* nếu muốn logo đều nhau */
.footer-logos img{
  height:90px;
  object-fit:contain;
}

 
.footer-brand p{
  color:#9fb4d1;
  margin-top:10px;
}

/* TITLE */
.footer-contact h4{
  color:#ffffff;
  font-size:1.1rem;
  margin-bottom:16px;
}

/* CONTACT */
.footer-contact-list a{
  color:#9fb4d1;
  transition:0.25s ease;
}

.footer-contact-list a i{
  color:#4ea3ff;
}

.footer-contact-list a:hover{
  color:#ffffff;
  transform:translateX(4px);
}

/* SOCIAL */
.footer-social{
  margin-top:16px;
  display:flex;
  gap:12px;
}

.social-btn{
  width:44px;
  height:44px;
  border-radius:14px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(255,255,255,0.05);
  border:1px solid rgba(255,255,255,0.08);
  color:#9fb4d1;
  font-size:16px;
  transition:0.3s ease;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-100px;
  left:50%;
  transform:translateX(-50%);
  width:500px;
  height:200px;
  background:radial-gradient(circle, rgba(80,130,255,0.25), transparent 70%);
  filter:blur(40px);
}
.footer-logos img:hover{
  filter:brightness(1.4) drop-shadow(0 0 10px rgba(80,130,255,0.6));
}
/* FB hover */
.social-btn:hover{
  background:#1877f2;
  color:#fff;
  transform:translateY(-4px);
  box-shadow:0 12px 24px rgba(24,119,242,0.4);
}

/* ZALO riêng */
.social-btn.zalo:hover{
  background:#0084ff;
  box-shadow:0 12px 24px rgba(0,132,255,0.4);
}

/* BOTTOM */
.footer-bottom{
  border-top:1px solid rgba(255,255,255,0.08);
  padding:18px 0;
  text-align:center;
}

.footer-bottom p{
  color:#7f97b5;
  font-size:14px;
}

/* RESPONSIVE */
@media (max-width:768px){
  .footer-inner{
    flex-direction:column;
    gap:26px;
  }
}

/* RESPONSIVE */
@media (max-width: 1100px){
  .hero-grid,
  .intro-wrap,
  .trust-box{
    grid-template-columns:1fr;
  }

  .feature-grid{
    grid-template-columns:1fr;
  }

  .hero-visual{
    max-width:520px;
    width:100%;
    margin:0 auto;
  }

  .hero-main-image{
    position:relative;
  }
}

@media (max-width: 860px){
  .site-nav,
  .header-btn{
    display:none;
  }

  .hero-section{
    padding-top:42px;
  }

  .hero-visual{
    min-height:560px;
  }

  .hero-main-image img{
    height:460px;
  }

  .hero-small-card{
    width:150px;
  }

  .hero-small-card img{
    height:150px;
  }

  .hero-small-card-1{
    left:0;
    bottom:80px;
  }

  .hero-small-card-2{
    left:auto;
    right:0;
    bottom:0;
  }

  .footer-inner{
    flex-direction:column;
  }
}

@media (max-width: 640px){
  .container{
    width:min(1180px, calc(100% - 22px));
  }

  .header-inner{
    min-height:76px;
  }

  .site-logo img{
    width:145px;
  }

  .hero-content h1{
    font-size:2rem;
  }

  .hero-content h2{
    font-size:1rem;
  }

  .hero-actions{
    flex-direction:column;
  }

  .btn-primary,
  .btn-secondary{
    width:100%;
  }

  .hero-main-image img{
    height:400px;
  }

  .intro-wrap,
  .feature-card,
  .trust-box{
    padding:22px;
  }

  .intro-image img,
  .trust-image img{
    height:300px;
  }
}


/* ===== FIX PAGE OVERFLOW X NGANG TRÊN MOBILE ===== */
html,
body{
  max-width:100%;
  overflow-x:hidden;
}

body{
  position:relative;
}

/* khóa mọi section chính khỏi lòi ngang */
.site-header,
.hero-section,
.intro-section,
.features-section,
.trust-section,
.site-footer,
main,
section{
  max-width:100%;
  overflow-x:clip;
}

/* khối glow nền toàn trang dễ gây tràn trên mobile */
body::after{
  width:min(280px, 70vw);
  height:min(280px, 70vw);
  left:50%;
  transform:translateX(-50%);
}

/* footer pseudo đang rất dễ lòi ngang */
.site-footer{
  position:relative;
  overflow:hidden;
}

.site-footer::before{
  left:50%;
  transform:translateX(-50%);
  max-width:100%;
}

/* ảnh và block tuyệt đối không được vượt khung */
img,
.hero-main-image,
.hero-small-card,
.intro-image,
.trust-image{
  max-width:100%;
}

/* mobile fix thêm */
@media (max-width: 860px){
  .hero-visual,
  .hero-main-image,
  .intro-wrap,
  .trust-box,
  .feature-grid,
  .footer-inner{
    max-width:100%;
    overflow-x:hidden;
  }

  .hero-small-card{
    display:none;
  }
}

@media (max-width: 480px){
  body::after{
    width:220px;
    height:220px;
  }
}