*{margin:0;padding:0;box-sizing:border-box}
body{font-family:sans-serif;line-height:1.6;color:#333;background-color:#f8f9fa;margin:0 auto}
.hide-on-mobile,.hide-on-desktop{display:none}
@media (min-width: 901px) {.hide-on-mobile{display:block}}
@media (max-width: 900px) {.hide-on-desktop{display:block}}
h1{font-size:1.5em}
h2{font-size:1.3em}
h3{font-size:1.1em}
h4{font-size:1em;text-align:center}
img{display:block;margin:0 auto;max-width:99%;max-height:99%}
a{color:#000;text-decoration:none}
a:hover{color:red}
/* Khung chinh */
#main-content-all{margin:20px auto;background:#F5F5F5;word-wrap:break-word;white-space:normal;padding:0 5px;border:1px solid #dcdcdc;box-shadow:2px 2px 9px rgba(128,128,128,0.3),-2px -2px 9px rgba(128,128,128,0.2);border-radius:10px;overflow:hidden}
.column-right{display:none}
@media (min-width: 901px) {
#main-content-all{display:block;max-width:1139px;margin:35px auto}
.column-container{display:grid;grid-template-columns:1fr 350px}
.column-left{display:block}
.column-right{display:block;border-left:.5px solid rgba(0,0,0,0.1)}
}
/* Logo & Banner */
.skip-link{position:absolute;left:-999px;top:auto;width:1px;height:1px;overflow:hidden;z-index:-99}
.skip-link:focus{position:static;width:auto;height:auto;left:auto;top:auto;z-index:auto;overflow:auto}
.link-kenhvang{color:#A00000;font-weight:700;font-size:18px}
.header-box{display:flex;max-width:1200px;margin:0 auto;padding:1rem;justify-content:center;position:relative}
.header-logo{display:flex;flex-direction:column;align-items:center;text-align:center;justify-content:center;position:relative}
.header-banner{display:none}
@media (min-width: 901px) {
.header-box{justify-content:space-between}
.header-banner{display:flex;align-items:center;gap:1rem}
}
/* Thanh menu */
#main-navigation-bar{background-color:#fff;box-shadow:0 2px 8px rgba(0,0,0,0.1);position:relative;z-index:1000;margin-bottom:6px}
.nav-container{display:flex;justify-content:space-between;align-items:center;padding:0 20px;max-width:1200px;margin:0 auto;height:60px}
.mobile-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;padding:10px;border-radius:8px;transition:all .3s ease;color:#333}
.mobile-toggle:hover{background-color:#f0f8ff;color:#06c}
.menu-close{display:none;background:none;border:none;font-size:39px;cursor:pointer;color:#666;width:40px;height:40px;border-radius:50%;transition:all .3s ease;margin-right:10px;margin-bottom:5px}
.menu-close:hover{background-color:#f0f0f0;color:#333}
.menu-header{display:contents}
.main-menu{display:flex;list-style:none;align-items:center;gap:8px;margin:0;padding:0}
.main-menu > li{position:relative}
.main-menu > li > a{text-decoration:none;color:#333;font-weight:500;padding:12px 16px;border-radius:8px;transition:all .3s ease;display:flex;align-items:center;gap:8px;white-space:nowrap}
.main-menu > li > a:hover{background-color:#f0f8ff;color:#06c;transform:translateY(-2px)}
.has-submenu > a::after{content:'';width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:4px solid currentColor;margin-left:auto;transition:transform .3s ease}
.has-submenu:hover > a::after{transform:rotate(180deg)}
.sub-menu{position:absolute;top:calc(100% + 8px);left:0;background-color:#fff;min-width:260px;box-shadow:0 8px 32px rgba(0,0,0,0.15);border-radius:12px;border:1px solid #e5e7eb;list-style:none;opacity:0;visibility:hidden;transform:translateY(-10px);transition:all .3s cubic-bezier(0.4,0,0.2,1);z-index:1001;margin:0;padding:12px 0}
.has-submenu:hover .sub-menu{opacity:1;visibility:visible;transform:translateY(0)}
.sub-menu li{position:relative}
.sub-menu a{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;text-decoration:none;color:#555;transition:all .3s ease;font-size:14px}
.sub-menu a:hover{background-color:#f0f4f8;color:#06c;padding-left:24px}
.sub-menu .has-submenu > a::after{content:'';width:0;height:0;border-top:4px solid transparent;border-bottom:4px solid transparent;border-left:4px solid currentColor;margin-left:8px}
.sub-menu-level2{position:absolute;top:0;left:calc(100% + 8px);background-color:#fff;min-width:200px;box-shadow:0 8px 32px rgba(0,0,0,0.15);border-radius:12px;border:1px solid #e5e7eb;list-style:none;opacity:0;visibility:hidden;transform:translateX(-10px);transition:all .3s cubic-bezier(0.4,0,0.2,1);z-index:1002;margin:0;padding:12px 0}
.sub-menu .has-submenu:hover .sub-menu-level2{opacity:1;visibility:visible;transform:translateX(0)}
.search-container{display:flex;align-items:center}
.search-wrapper{display:flex;align-items:center;background-color:#f8f9fa;border-radius:30px;padding:4px;transition:all .3s ease;border:1px solid #ddd}
.search-wrapper:focus-within{border-color:#06c;box-shadow:0 0 0 4px rgba(0,102,204,0.1);background-color:#fff}
#search-mobile-desktop{border:none;background:none;padding:10px 16px;outline:none;width:250px;font-size:14px;color:#333}
#search-mobile-desktop::placeholder{color:#999}
.search-wrapper button{background-color:#06c;color:#fff;border:none;padding:10px 12px;border-radius:50%;cursor:pointer;font-size:16px;transition:all .3s ease;margin-left:4px;min-width:40px;height:40px;display:flex;align-items:center;justify-content:center}
.search-wrapper button:hover{background-color:#0056b3;transform:scale(1.05)}
.search-wrapper button:active{transform:scale(0.95)}
@media (max-width: 900px) {
.nav-container{padding:0 12px;height:60px}
.mobile-toggle{display:block;order:1}
.search-container{order:3;margin-left:auto}
.menu-close{display:block}
.menu-header{display:flex;align-items:center;justify-content:space-between;width:100%;border-bottom:1px solid #f1f3f5;padding:0}
.menu-header a{flex:1}
.main-menu{position:fixed;top:0;left:-100%;width:280px;height:100vh;background-color:#fff;flex-direction:column;align-items:stretch;padding:70px 0 20px;transition:left .3s cubic-bezier(0.4,0,0.2,1);overflow-y:auto;box-shadow:2px 0 24px rgba(0,0,0,0.15);gap:0;z-index:1001}
.main-menu.active{left:0}
.main-menu > li{width:100%;border-bottom:1px solid #f1f3f5}
.main-menu > li:last-child{border-bottom:none}
.main-menu > li > a{padding:18px 24px;border-radius:0;width:100%;justify-content:space-between;font-size:16px}
.main-menu > li > a:hover{background-color:#f8fafc;transform:none}
.has-submenu > a::after{border-top:5px solid currentColor;border-left:5px solid transparent;border-right:5px solid transparent;transition:transform .3s ease}
.has-submenu.active > a::after{transform:rotate(180deg)}
.sub-menu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;background-color:#f8fafc;max-height:0;overflow:hidden;transition:max-height .3s cubic-bezier(0.4,0,0.2,1);margin:0;padding:0;border-radius:0;border:none}
.has-submenu.active .sub-menu{max-height:500px}
.sub-menu a{padding:16px 48px;font-size:15px;border-bottom:1px solid #e9ecef}
.sub-menu a:hover{background-color:#e9ecef;padding-left:52px}
.sub-menu li:last-child a{border-bottom:none}
.sub-menu-level2{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;background-color:#e9ecef;max-height:0;overflow:hidden;transition:max-height .3s cubic-bezier(0.4,0,0.2,1);border-radius:0;border:none;margin:0;padding:0}
.sub-menu .has-submenu.active .sub-menu-level2{max-height:300px}
.sub-menu-level2 a{padding:14px 72px;font-size:14px;background-color:#e9ecef}
.sub-menu-level2 a:hover{background-color:#dee2e6;padding-left:76px}
#search-mobile-desktop{width:160px;font-size:14px;padding:8px 12px}
.search-wrapper{border-radius:25px;border:1px solid #ddd}
.search-wrapper button{padding:8px 10px;font-size:14px;min-width:36px;height:36px}
}
@media (max-width: 480px) {
.nav-container{padding:0 12px}
#search-mobile-desktop{width:120px;font-size:13px;padding:8px 12px}
.search-wrapper button{padding:6px 8px;min-width:32px;height:32px}
.main-menu{width:280px}
}
.menu-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100vh;background-color:rgba(0,0,0,0.5);z-index:1000;opacity:0;transition:opacity .3s ease;backdrop-filter:blur(4px)}
.menu-overlay.active{display:block;opacity:1}
.main-menu::-webkit-scrollbar{width:6px}
.main-menu::-webkit-scrollbar-track{background:#f1f1f1}
.main-menu::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:3px}
.main-menu::-webkit-scrollbar-thumb:hover{background:#a8a8a8}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
/* Thanh breadcrumb */
.breadcrumb{color:#666;border-bottom:.5px solid #ccc;padding:10px 0 10px 20px;font-weight:700}
.breadcrumb a{text-decoration:none;color:#007cba}
.breadcrumb a:hover{text-decoration:underline}