/* Duong dan: public/assets/css/web-theme.css
   Giao dien cong khai theo thiet ke thu muc /web (mau do #BA1A1A + vang #FFC107).
   Port tu web/index.html. Chi nap o layout frontend cong khai (KHONG dung admin). */
        :root {
            --primary-dark-red: #8B0000;
            --primary-red: #BA1A1A;
            --primary-gold: #FFC107;
            --primary-light-gold: #FFF8E1;
            --primary-white: #FFFFFF;
            --primary-black: #111827;
            --primary-gray: #F9FAFB;
            --secondary-gray: #4B5563;
            --border-color: #E5E7EB;
            
            --radius-sm: 12px;
            --radius-md: 20px;
            --radius-lg: 32px;
            --radius-pill: 99px;
            
            --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.03);
            --shadow-md: 0 10px 30px rgba(139, 0, 0, 0.08);
            --shadow-lg: 0 20px 40px rgba(139, 0, 0, 0.15);
            --shadow-float: 0 30px 60px rgba(139, 0, 0, 0.2);
            
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            --transition-slow: all 0.5s cubic-bezier(0.25, 0.8, 0.25, 1);
        }
        
        * { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
        html { scroll-behavior: smooth; }

        body {
            font-family: 'Inter', sans-serif;
            color: var(--primary-black);
            line-height: 1.6;
            background-color: var(--primary-gray);
            overflow-x: hidden;
            position: relative;
        }

        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--primary-gray); }
        ::-webkit-scrollbar-thumb { background: var(--primary-red); border-radius: 10px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--primary-dark-red); }

        h1, h2, h3, h4, h5 { font-family: 'Montserrat', sans-serif; color: var(--primary-dark-red); line-height: 1.3; }
        .container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px; position: relative; }

        .reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.8s ease-out, transform 0.8s ease-out; will-change: opacity, transform; }
        .reveal.active { opacity: 1; transform: translateY(0); }
        .reveal-delay-1 { transition-delay: 0.1s; }
        .reveal-delay-2 { transition-delay: 0.2s; }

        .bg-blob { position: fixed; border-radius: 50%; filter: blur(120px); z-index: -1; opacity: 0.5; pointer-events: none; }
        .blob-1 { top: -10%; left: -10%; width: 50vw; height: 50vw; background: var(--primary-light-gold); animation: floatBlob 12s ease-in-out infinite; }
        .blob-2 { bottom: -10%; right: -10%; width: 40vw; height: 40vw; background: rgba(139, 0, 0, 0.08); animation: floatBlob 10s ease-in-out infinite reverse; }
        @keyframes floatBlob { 0%, 100% { transform: translate(0, 0) scale(1); } 50% { transform: translate(30px, -30px) scale(1.1); } }

        .cta-button {
            background: linear-gradient(135deg, var(--primary-red), var(--primary-dark-red)); color: var(--primary-white);
            padding: 18px 42px; border-radius: var(--radius-pill); text-decoration: none; font-family: 'Montserrat', sans-serif;
            font-weight: 700; font-size: 18px; display: inline-flex; align-items: center; justify-content: center;
            border: none; cursor: pointer; box-shadow: 0 10px 20px rgba(139, 0, 0, 0.2); position: relative;
            overflow: hidden; transition: var(--transition); z-index: 1;
        }
        .cta-button::after {
            content: ''; position: absolute; top: 0; left: -100%; width: 50%; height: 100%;
            background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.3) 50%, rgba(255,255,255,0) 100%);
            transform: skewX(-25deg); animation: shine 3s infinite; z-index: -1;
        }
        @keyframes shine { 0% { left: -100%; } 20% { left: 200%; } 100% { left: 200%; } }
        .cta-button:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); color: var(--primary-white); }
        
        .secondary-button {
            background: rgba(255, 255, 255, 0.1); backdrop-filter: blur(10px); color: var(--primary-white);
            border: 1px solid rgba(255, 255, 255, 0.3); padding: 18px 42px; border-radius: var(--radius-pill);
            text-decoration: none; font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 18px; transition: var(--transition);
        }
        .secondary-button:hover { background: var(--primary-white); color: var(--primary-dark-red); transform: translateY(-3px); }

        header { 
            position: fixed; width: 100%; top: 0; z-index: 1000; background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid rgba(255,255,255,0.3); transition: var(--transition); 
        }
        header.scrolled { box-shadow: var(--shadow-soft); background: rgba(255, 255, 255, 0.98); padding: 5px 0; }
        .header-container { display: flex; justify-content: space-between; align-items: center; height: 80px; transition: var(--transition); }
        .logo { display: flex; align-items: center; text-decoration: none; gap: 8px; }
        .logo h1 { font-size: 28px; font-weight: 900; letter-spacing: -1px; }
        .logo span { color: var(--primary-gold); }
        .logo-icon { color: var(--primary-red); font-size: 32px; }
        .logo-img { height: 64px; width: auto; object-fit: contain; transition: var(--transition); }
        .logo:hover .logo-img { transform: scale(1.05); }

        /* Bo cuc thanh dieu huong: menu + nhom nut hanh dong */
        .desktop-nav { display: flex; align-items: center; gap: 28px; }
        .nav-actions { display: flex; align-items: center; gap: 14px; padding-left: 26px; border-left: 1px solid var(--border-color); }
        .nav-icon-btn {
            width: 42px; height: 42px; border-radius: 50%; border: 1.5px solid var(--border-color);
            display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
            color: var(--secondary-gray); font-size: 16px; text-decoration: none; transition: var(--transition);
        }
        .nav-icon-btn:hover { background: var(--primary-dark-red); border-color: var(--primary-dark-red); color: var(--primary-white); transform: translateY(-2px); box-shadow: 0 8px 18px rgba(139,0,0,.2); }
        .nav-cta { padding: 11px 26px; font-size: 14px; gap: 7px; }

        nav ul.main-menu { display: flex; align-items: center; list-style: none; gap: 6px; margin: 0; padding: 0; }
        nav ul.main-menu > li > a {
            text-decoration: none; color: var(--secondary-gray); font-family: 'Montserrat', sans-serif; font-weight: 600;
            font-size: 15px; position: relative; padding: 10px 16px; border-radius: var(--radius-pill); display: flex; align-items: center; gap: 6px; transition: var(--transition);
        }
        nav ul.main-menu > li > a::after {
            content: ''; position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%); width: 0; height: 3px;
            background: var(--primary-gold); border-radius: 3px; transition: var(--transition);
        }
        nav ul.main-menu > li:hover > a { color: var(--primary-dark-red); background: var(--primary-light-gold); }
        nav ul.main-menu > li.active > a { color: var(--primary-dark-red); background: var(--primary-light-gold); }
        nav ul.main-menu > li:hover > a::after, nav ul.main-menu > li.active > a::after { width: 24px; background: var(--primary-dark-red); }

        nav ul.main-menu > li { position: relative; }
        .dropdown-menu {
            position: absolute; top: calc(100% + 15px); left: -20px; background: var(--primary-white); min-width: 260px;
            border-radius: var(--radius-md); box-shadow: var(--shadow-lg); opacity: 0; visibility: hidden; transform: translateY(10px);
            transition: var(--transition); border: 1px solid var(--border-color); padding: 10px; z-index: 100;
        }
        nav ul.main-menu > li::before { content: ''; position: absolute; bottom: -25px; left: 0; width: 100%; height: 25px; }
        nav ul.main-menu > li:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }
        .dropdown-menu li { list-style: none; margin-bottom: 5px; }
        .dropdown-menu a {
            display: flex; align-items: center; padding: 12px 16px; border-radius: var(--radius-sm); text-decoration: none; 
            color: var(--secondary-gray); font-weight: 500; font-size: 14px; transition: var(--transition);
        }
        .dropdown-menu a i { width: 24px; color: var(--primary-red); transition: var(--transition); }
        .dropdown-menu a:hover { background: var(--primary-light-gold); color: var(--primary-dark-red); padding-left: 20px; }

        .mobile-toggle { display: none; background: none; border: none; font-size: 24px; color: var(--primary-black); cursor: pointer; z-index: 1001; }
        .mobile-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); backdrop-filter: blur(5px); z-index: 1000; opacity: 0; visibility: hidden; transition: var(--transition); }
        .mobile-menu { position: fixed; top: 0; right: 0; width: 80%; max-width: 320px; height: 100%; background: var(--primary-white); z-index: 1001; transform: translateX(100%); transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1); box-shadow: -10px 0 30px rgba(0,0,0,0.1); display: flex; flex-direction: column; }
        .mobile-menu.active { transform: translateX(0); }
        .mobile-overlay.active { opacity: 1; visibility: visible; }
        .mobile-menu-header { padding: 25px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
        .mobile-menu-body { padding: 20px; overflow-y: auto; flex-grow: 1; }
        .mobile-nav-list { list-style: none; }
        .mobile-nav-list li { margin-bottom: 10px; }
        .mobile-nav-list a { display: flex; align-items: center; gap: 15px; padding: 15px; border-radius: var(--radius-sm); color: var(--primary-black); text-decoration: none; font-weight: 600; font-size: 16px; transition: var(--transition); }
        .mobile-nav-list a i { font-size: 20px; color: var(--secondary-gray); width: 24px; text-align: center; }
        .mobile-nav-list a.active, .mobile-nav-list a:hover { background: var(--primary-light-gold); color: var(--primary-dark-red); }
        .mobile-nav-list a.active i { color: var(--primary-red); }

        .page-wrapper { margin-top: 80px; }
        .page-content { display: block; animation: fadeIn 0.5s; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
        
        .section-padding { padding: 100px 0; }
        .section-title { text-align: center; margin-bottom: 70px; }
        .section-title h1, .section-title h2 { font-size: 42px; position: relative; display: inline-block; padding-bottom: 20px; }
        .section-title h1::after, .section-title h2::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 80px; height: 4px; background: linear-gradient(90deg, var(--primary-gold), var(--primary-red)); border-radius: var(--radius-pill); }
        .section-title p { max-width: 900px; margin: 20px auto 0; color: var(--secondary-gray); font-size: 26px; font-weight: 500; line-height: 1.6; }

        .breadcrumb { padding: 30px 0 10px; }
        .breadcrumb-container { display: flex; align-items: center; font-weight: 600; font-size: 15px; }
        .breadcrumb a { color: var(--secondary-gray); text-decoration: none; transition: var(--transition); }
        .breadcrumb a:hover { color: var(--primary-dark-red); }
        .breadcrumb span { margin: 0 12px; color: var(--border-color); }
        .breadcrumb .current { color: var(--primary-dark-red); }

        .hero { position: relative; color: var(--primary-white); padding: 160px 0 200px; text-align: center; border-radius: 0 0 40px 40px; overflow: hidden; background: var(--primary-black); }
        .hero-bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: url('../../uploads/web/anh_gioi_thieu/anh_bia.jpg') center/cover no-repeat; animation: zoomBg 25s infinite alternate linear; z-index: 0; }
        @keyframes zoomBg { 0% { transform: scale(1); } 100% { transform: scale(1.1); } }
        .hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(139,0,0,0.85) 0%, rgba(17,24,39,0.7) 100%); z-index: 1; }
        .hero .container { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; }
        .hero h1, .hero h2 { font-size: 56px; font-weight: 900; color: var(--primary-white); margin-bottom: 24px; letter-spacing: -1px; text-shadow: 0 10px 30px rgba(0,0,0,0.5); }
        .hero p { font-size: 26px; font-weight: 500; max-width: 900px; margin: 0 auto 40px; line-height: 1.6; color: rgba(255,255,255,0.9); }
        .hero-buttons { display: flex; gap: 20px; }
        .custom-shape-divider-bottom { position: absolute; bottom: 0; left: 0; width: 100%; overflow: hidden; line-height: 0; transform: rotate(180deg); z-index: 2;}
        .custom-shape-divider-bottom svg { position: relative; display: block; width: calc(100% + 1.3px); height: 60px; }
        .custom-shape-divider-bottom .shape-fill { fill: var(--primary-gray); }

        .stats-wrapper { margin-top: -80px; position: relative; z-index: 10; padding: 0; }
        .stats-bar { background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(20px); border-radius: 0; box-shadow: var(--shadow-lg); display: grid; grid-template-columns: repeat(5, 1fr); padding: 60px 40px; border-top: 1px solid rgba(255,255,255,0.8); border-bottom: 1px solid rgba(255,255,255,0.8); }
        .stat-item { text-align: center; position: relative; }
        .stat-item:not(:last-child)::after { content: ''; position: absolute; right: 0; top: 10%; height: 80%; width: 1px; background: var(--border-color); }
        .stat-item i { font-size: 42px; color: var(--primary-gold); margin-bottom: 18px; }
        .stat-item h3 { font-size: 46px; color: var(--primary-dark-red); margin-bottom: 8px; font-weight: 900; }
        .stat-item p { color: var(--secondary-gray); font-weight: 500; font-size: 26px; letter-spacing: 0.5px; padding: 0 15px; line-height: 1.6; }

        .features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
        .feature-card { background: var(--primary-white); border-radius: var(--radius-lg); padding: 40px 30px 60px; text-align: center; box-shadow: var(--shadow-soft); transition: var(--transition-slow); border: 1px solid transparent; position: relative; z-index: 1; display: flex; flex-direction: column; }
        .feature-card:hover { transform: translateY(-15px); box-shadow: var(--shadow-float); border-color: rgba(139, 0, 0, 0.1); z-index: 2; }
        .feature-img-wrapper { height: 260px; overflow: hidden; border-radius: var(--radius-md); box-shadow: var(--shadow-md); margin-bottom: 0;}
        .feature-img-wrapper img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.8s cubic-bezier(0.25, 0.8, 0.25, 1); cursor: pointer; }
        .feature-card:hover .feature-img-wrapper img { transform: scale(1.1); }
        .feature-icon-wrapper { width: 80px; height: 80px; background: var(--primary-white); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: -40px auto 25px; position: relative; z-index: 2; box-shadow: 0 10px 25px rgba(0,0,0,0.1); border: 4px solid var(--primary-gray); }
        .feature-icon { font-size: 32px; color: var(--primary-red); }
        .feature-card h3 { font-size: 24px; margin-bottom: 15px; }
        .feature-card p { font-size: 17px; line-height: 1.7; color: var(--secondary-gray); font-weight: 500; margin-bottom: 0; }

        /* OPEN LETTER SECTION */
        .open-letter-wrapper { display: flex; gap: 40px; background: var(--primary-white); border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); align-items: center; padding: 50px 50px 50px 30px; }
        .open-letter-image { flex: 0 0 48%; position: relative; min-height: 650px; transform: perspective(1000px) rotateY(10deg) scale(1.05) translateX(-15px); box-shadow: -25px 25px 45px rgba(0,0,0,0.25); border-radius: 12px; z-index: 2; transition: all 0.6s cubic-bezier(0.25, 0.8, 0.25, 1); border: 8px solid var(--primary-white); background: var(--primary-white); }
        .open-letter-image:hover { transform: perspective(1000px) rotateY(0deg) scale(1.08) translateX(0); box-shadow: 0 35px 60px rgba(0,0,0,0.3); z-index: 3; }
        .open-letter-image img { width: 100%; height: 100%; object-fit: cover; border-radius: 6px; position: absolute; inset: 0; }
        .open-letter-content { flex: 1; padding: 0 20px 0 0; }
        .letter-title { font-size: 38px; color: var(--primary-dark-red); font-weight: 900; line-height: 1.3; margin-bottom: 35px; position: relative; padding-bottom: 20px; }
        .letter-title::after { content: ''; position: absolute; bottom: 0; left: 0; width: 60px; height: 4px; background: var(--primary-gold); border-radius: var(--radius-pill); }
        .letter-body { color: var(--secondary-gray); font-size: 17px; line-height: 1.8; }
        .letter-body p { margin-bottom: 18px; text-align: justify; }
        .letter-body .greeting { font-weight: 700; color: var(--primary-dark-red); font-size: 19px; margin-bottom: 25px; text-align: left; }
        .letter-body .signature { margin-top: 45px; border-top: 1px solid rgba(0,0,0,0.1); padding-top: 30px; }
        .signature p { margin-bottom: 5px; font-style: italic; text-align: left; }
        .signature h4 { color: var(--primary-dark-red); font-size: 22px; font-weight: 900; margin-bottom: 5px; }
        .signature h5 { color: var(--primary-gold); font-size: 16px; font-weight: 700; text-transform: uppercase; margin-bottom: 0; }

        .progress-track { background-color: var(--primary-white); padding: 50px; border-radius: var(--radius-lg); margin-bottom: 80px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
        .progress-track h3 { text-align: center; margin-bottom: 10px; font-size: 28px; }
        .progress-visual { display: flex; justify-content: space-between; align-items: flex-start; position: relative; margin-top: 40px; }
        .progress-visual::before { content: ''; position: absolute; top: 25px; left: 5%; width: 90%; height: 4px; background: var(--primary-gold); z-index: 1; }
        .progress-step { position: relative; z-index: 2; text-align: center; flex: 1; padding: 0 10px; }
        .step-dot { width: 54px; height: 54px; background: var(--primary-white); border: 4px solid var(--primary-gold); border-radius: 50%; margin: 0 auto 20px; display: flex; align-items: center; justify-content: center; font-weight: 800; color: var(--primary-dark-red); font-size: 18px; box-shadow: 0 0 0 6px rgba(255, 215, 0, 0.2); transition: var(--transition); }
        .progress-step:hover .step-dot { background: var(--primary-gold); color: var(--primary-white); transform: scale(1.1); }
        .step-content strong { display: block; color: var(--primary-dark-red); font-size: 21px; margin-bottom: 8px; font-family: 'Montserrat', sans-serif; text-transform: uppercase; }
        .step-content span { display: block; font-size: 16px; color: var(--secondary-gray); line-height: 1.5; }

        .course-category { margin-bottom: 80px; }
        .course-category-title { display: flex; align-items: center; gap: 15px; font-size: 28px; margin-bottom: 40px; }
        .course-category-title i { width: 50px; height: 50px; background: var(--primary-light-gold); color: var(--primary-dark-red); border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 24px; }
        .course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 30px; }
        .course-card { background: var(--primary-white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-soft); transition: var(--transition); display: flex; flex-direction: column; border: 1px solid var(--border-color); color: inherit; }
        .course-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-md); border-color: rgba(139,0,0,0.2); }
        .course-card-header { padding: 30px 25px 20px; border-bottom: 1px solid var(--primary-gray); position: relative; }
        .course-card-header::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: linear-gradient(90deg, var(--primary-red), var(--primary-gold)); }
        .course-card-header h4 { font-size: 25px; margin-bottom: 12px; font-weight: 800; line-height: 1.4; }
        .course-card-header h4 a { color: var(--primary-black); text-decoration: none; transition: var(--transition); }
        .course-card-header h4 a:hover { color: var(--primary-dark-red); }
        .course-card-title-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
        .course-level { display: inline-block; background: var(--primary-light-gold); color: var(--primary-dark-red); padding: 7px 16px; border-radius: var(--radius-pill); font-size: 14px; font-weight: 700; }
        .course-card-body { padding: 30px; flex-grow: 1; display: flex; flex-direction: column; }
        .course-card-body p { color: var(--secondary-gray); margin-bottom: 25px; font-size: 16px; line-height: 1.6; }
        .course-detail-item { margin-bottom: 15px; display: flex; align-items: center; font-size: 15px; color: var(--primary-black); }
        .course-detail-item i { color: var(--primary-red); width: 26px; font-size: 17px; }
        .course-detail-item .detail-label { font-weight: 700; margin-right: 8px; }
        .course-price { background-color: var(--primary-gray); padding: 15px; border-radius: var(--radius-md); margin-top: auto; border-left: 4px solid var(--primary-gold); display: flex; align-items: center; justify-content: space-between; transition: var(--transition); }
        .price-tag { font-weight: 800; color: var(--primary-dark-red); font-size: 16px; }
        .course-card:hover .course-price { background-color: var(--primary-light-gold); }
        .course-card-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: auto; }
        .course-card-actions .btn-outline-web, .course-card-actions .cta-button { width: 100%; min-height: 44px; padding: 10px 4px; font-size: 13.5px; font-weight: 700; gap: 5px; text-align: center; white-space: nowrap; display: flex; justify-content: center; align-items: center; }
        /* FILTER TABS */
        .course-filter-tabs { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }
        .filter-tab { background-color: var(--primary-white); border: 2px solid var(--primary-gray); padding: 10px 24px; border-radius: var(--radius-pill); cursor: pointer; font-weight: 600; font-family: 'Inter', sans-serif; color: var(--secondary-gray); transition: var(--transition); font-size: 15px; display: flex; gap: 8px; align-items: center; }
        .filter-tab:hover { color: var(--primary-dark-red); border-color: var(--primary-gold); }
        .filter-tab.active { background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); color: var(--primary-white); border-color: transparent; box-shadow: 0 5px 15px rgba(139, 0, 0, 0.2); }

        .about-tabs { display: flex; justify-content: center; margin-bottom: 50px; flex-wrap: wrap; gap: 10px; background: rgba(255,255,255,0.7); backdrop-filter: blur(10px); padding: 8px; border-radius: var(--radius-pill); box-shadow: var(--shadow-soft); width: fit-content; margin-inline: auto; border: 1px solid var(--primary-white); }
        .about-tab { background-color: transparent; border: none; padding: 12px 28px; border-radius: var(--radius-pill); cursor: pointer; font-weight: 600; font-family: 'Inter', sans-serif; color: var(--secondary-gray); transition: var(--transition); font-size: 15px; display: flex; gap: 8px; align-items: center; }
        .about-tab:hover { color: var(--primary-dark-red); background: rgba(0,0,0,0.03); }
        .about-tab.active { background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); color: var(--primary-white); box-shadow: 0 10px 20px rgba(139, 0, 0, 0.2); }
        .about-content { background-color: var(--primary-white); border-radius: var(--radius-lg); padding: 50px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
        .about-tab-content { display: none; animation: fadeIn 0.4s ease-out forwards; }
        .about-tab-content.active { display: block; }
        .about-tab-content h3 { font-size: 32px; margin-bottom: 20px; display: flex; align-items: center; gap: 15px; }
        .about-tab-content h3::before { content: ''; display: block; width: 6px; height: 30px; background: var(--primary-gold); border-radius: 4px; }

        .teachers-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; margin-top: 30px; }
        .teacher-card { background-color: var(--primary-gray); border-radius: var(--radius-md); overflow: hidden; transition: var(--transition); border: 1px solid var(--border-color); text-align: center; }
        .teacher-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-md); border-color: rgba(139,0,0,0.2); background: var(--primary-white); }
        .teacher-img { height: 280px; overflow: hidden; }
        .teacher-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; cursor: pointer;}
        .teacher-card:hover .teacher-img img { transform: scale(1.08); }
        .teacher-info { padding: 25px 20px; }
        .teacher-info h4 { font-size: 20px; margin-bottom: 5px; }
        .teacher-position { color: var(--primary-red); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; display: block; }
        .teacher-qualification { color: var(--secondary-gray); font-size: 14px; margin-bottom: 10px; display: block; }
        .teacher-experience { margin-top: 15px; padding-top: 15px; border-top: 1px dashed var(--border-color); color: var(--primary-black); font-weight: 600; font-size: 14px;}

        .certificates-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 40px; }
        .certificate-item-vertical, .certificate-item-horizontal { border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-soft); transition: var(--transition); border: 1px solid var(--border-color); background: var(--primary-gray); }
        .certificate-item-vertical:hover, .certificate-item-horizontal:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
        .certificate-img-vertical { height: 240px; }
        .certificate-img-horizontal { width: 350px; }
        .certificate-img-vertical img, .certificate-img-horizontal img { width: 100%; height: 100%; object-fit: cover; cursor: pointer;}
        .certificate-name { padding: 15px; text-align: center; font-weight: 600; font-size: 14px; }
        .certificate-item-horizontal { display: flex; height: 220px; }
        .certificate-info-horizontal { padding: 30px; display: flex; flex-direction: column; justify-content: center; }

        .bento-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: 250px 250px; gap: 20px; margin-bottom: 30px; }
        .bento-item { border-radius: var(--radius-lg); overflow: hidden; position: relative; box-shadow: var(--shadow-soft); transition: var(--transition); }
        .bento-item:hover { transform: scale(1.02); z-index: 2; box-shadow: var(--shadow-md); }
        .bento-item img { width: 100%; height: 100%; object-fit: cover; cursor: pointer; }
        .bento-large { grid-row: span 2; }

        .timeline-container { position: relative; padding-left: 40px; border-left: 3px solid var(--primary-gold); margin-top: 30px;}
        .timeline-item { margin-bottom: 30px; position: relative; }
        .timeline-dot { position: absolute; left: -49px; top: 0; width: 16px; height: 16px; background: var(--primary-dark-red); border-radius: 50%; border: 3px solid white; box-shadow: 0 0 0 3px var(--primary-gold); }
        .timeline-item h4 { font-size: 20px; margin-bottom: 8px;}
        .timeline-item p { color: var(--secondary-gray); }

        /* Giao diện hiển thị thông tin 2 Nhà phát triển */
        .dev-container { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
        .dev-card { background: var(--primary-white); border-radius: var(--radius-lg); padding: 50px 40px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); text-align: center; transition: var(--transition); }
        .dev-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-md); border-color: rgba(139,0,0,0.2); }
        
        /* Cập nhật CSS cho ô chứa Logo dạng ảnh */
        .dev-logo { 
            width: 120px; height: 120px; border-radius: 50%; margin: 0 auto 30px; 
            position: relative; overflow: hidden; background: var(--primary-white);
            display: flex; align-items: center; justify-content: center;
        }
        .dev-logo img { width: 100%; height: 100%; object-fit: contain; padding: 5px; } /* Đảm bảo ảnh không bị méo */
        .logo-nxs { box-shadow: 0 10px 25px rgba(17, 24, 39, 0.15); border: 2px solid var(--border-color); }
        .logo-avec { box-shadow: 0 10px 25px rgba(139, 0, 0, 0.15); border: 2px solid var(--border-color); }
        
        .dev-card h3 { font-size: 28px; color: var(--primary-black); margin-bottom: 10px; }
        .dev-card .role { color: var(--primary-red); font-weight: 700; margin-bottom: 20px; font-size: 14px; text-transform: uppercase; letter-spacing: 1px; }
        .dev-card p.desc { color: var(--secondary-gray); margin-bottom: 30px; font-size: 15px; }
        .dev-social a { width: 45px; height: 45px; border-radius: 50%; background: var(--primary-gray); display: inline-flex; align-items: center; justify-content: center; color: var(--secondary-gray); transition: var(--transition); margin: 0 5px; font-size: 18px; }
        .dev-social a:hover { background: var(--primary-gold); color: var(--primary-dark-red); transform: translateY(-3px); }

        /* CSS cho phần thông tin liên hệ Nhà phát triển mới thêm */
        .dev-contact-info { text-align: left; margin-bottom: 25px; padding-top: 20px; border-top: 1px dashed var(--border-color); }
        .dev-contact-item { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 12px; font-size: 14px; color: var(--secondary-gray); line-height: 1.5; }
        .dev-contact-item i { color: var(--primary-red); font-size: 16px; margin-top: 3px; width: 20px; text-align: center; }
        .dev-contact-item strong { color: var(--primary-black); display: inline-block; min-width: 60px; }

        /* Modals & Lightbox */
        .modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.6); backdrop-filter: blur(8px); display: none; justify-content: center; align-items: center; z-index: 2000; padding: 20px; opacity: 0; transition: opacity 0.3s ease; }
        .modal-overlay.active { display: flex; opacity: 1; }
        .modal-content { background-color: var(--primary-white); border-radius: var(--radius-lg); width: 100%; max-width: 850px; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-float); transform: scale(0.95); transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1); }
        .modal-overlay.active .modal-content { transform: scale(1); }
        .modal-header { background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); padding: 25px 30px; display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; z-index: 10; }
        .modal-header h3 { color: var(--primary-white); font-size: 24px; margin: 0; }
        .close-modal { background: rgba(255,255,255,0.2); border: none; color: var(--primary-white); width: 36px; height: 36px; border-radius: 50%; font-size: 18px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: var(--transition); }
        .close-modal:hover { background: var(--primary-white); color: var(--primary-dark-red); transform: rotate(90deg); }
        .modal-body { padding: 30px; }
        .modal-course-details { display: grid; grid-template-columns: 1.5fr 1fr; gap: 30px; margin-bottom: 30px; }
        .modal-course-info { background-color: var(--primary-gray); padding: 25px; border-radius: var(--radius-md); border: 1px solid var(--border-color); }
        .modal-course-info h4 { color: var(--primary-black); margin-bottom: 15px; padding-bottom: 15px; border-bottom: 1px solid var(--border-color); font-size: 18px; }
        .modal-course-info ul { padding-left: 20px; margin-top: 10px; }
        .modal-course-info li { margin-bottom: 8px; }
        .modal-price { background: var(--primary-light-gold); padding: 20px; border-radius: var(--radius-md); margin-top: 20px; text-align: center; }
        .modal-price .price-tag { font-size: 22px; color: var(--primary-dark-red); margin: 10px 0; display: block; font-weight: 800;}
        .modal-footer { padding: 0 30px 30px; text-align: center; }

        .lightbox-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.9); backdrop-filter: blur(10px); display: none; justify-content: center; align-items: center; z-index: 3000; padding: 20px; opacity: 0; transition: opacity 0.3s; }
        .lightbox-overlay.active { display: flex; opacity: 1; }
        .lightbox-content { position: relative; max-width: 90vw; max-height: 90vh; }
        .lightbox-img { max-width: 100%; max-height: 90vh; object-fit: contain; border-radius: var(--radius-sm); box-shadow: 0 10px 40px rgba(0,0,0,0.5); }
        .lightbox-close { position: absolute; top: -50px; right: 0; background: none; border: none; color: white; font-size: 36px; cursor: pointer; transition: 0.3s; }
        .lightbox-close:hover { color: var(--primary-gold); transform: rotate(90deg); }
        .lightbox-nav { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); backdrop-filter: blur(5px); color: white; width: 50px; height: 50px; border-radius: 50%; font-size: 24px; cursor: pointer; display: flex; justify-content: center; align-items: center; transition: 0.3s; }
        .lightbox-nav:hover { background: var(--primary-gold); color: var(--primary-dark-red); }
        .lightbox-prev { left: -70px; }
        .lightbox-next { right: -70px; }
        .lightbox-counter { position: absolute; bottom: -40px; left: 0; width: 100%; text-align: center; color: white; font-weight: 600; letter-spacing: 2px; }

        footer { background: var(--primary-black); color: rgba(255,255,255,0.7); padding: 100px 0 30px; border-radius: 60px 60px 0 0; margin-top: 60px; position: relative; overflow: hidden;}
        .footer-container { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 60px; margin-bottom: 50px; }
        .footer-logo h3 { color: var(--primary-white); font-size: 32px; margin-bottom: 20px; }
        .footer-logo span { color: var(--primary-gold); }
        .footer-logo-img { height: 100px; width: auto; object-fit: contain; margin-bottom: 20px; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.3)); }
        .footer-links h4, .footer-social h4 { color: var(--primary-white); margin-bottom: 25px; font-size: 18px; text-transform: uppercase; letter-spacing: 1px; }
        .footer-links ul { list-style: none; }
        .footer-links ul li { margin-bottom: 12px; }
        .footer-links ul li a { color: inherit; text-decoration: none; transition: var(--transition); display: inline-block; }
        .footer-links ul li a:hover { color: var(--primary-gold); transform: translateX(5px); }
        .social-icons { display: flex; gap: 15px; }
        .social-icons a { width: 45px; height: 45px; background: rgba(255,255,255,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--primary-white); transition: var(--transition); }
        .social-icons a:hover { background: var(--primary-gold); color: var(--primary-dark-red); transform: translateY(-5px); }
        .copyright { text-align: center; padding-top: 30px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 14px; }

        /* Nut lien he noi kieu AssistiveTouch */
        .floating-contact {
            position: fixed;
            right: max(20px, env(safe-area-inset-right));
            bottom: max(24px, env(safe-area-inset-bottom));
            z-index: 999;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 14px;
        }
        .floating-contact__button {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 58px;
            height: 58px;
            border: 3px solid rgba(255,255,255,.96);
            border-radius: 50%;
            color: #fff;
            text-decoration: none;
            box-shadow: 0 8px 24px rgba(17,24,39,.24), inset 0 0 0 1px rgba(255,255,255,.18);
            isolation: isolate;
            transition: transform .25s ease, box-shadow .25s ease;
        }
        .floating-contact__button::before {
            content: '';
            position: absolute;
            inset: -7px;
            z-index: -1;
            border: 2px solid currentColor;
            border-radius: inherit;
            opacity: .22;
            animation: floatingContactPulse 2.4s ease-out infinite;
        }
        .floating-contact__button--facebook { background: linear-gradient(145deg, #2d88ff, #0b5dcc); }
        .floating-contact__button--zalo { background: linear-gradient(145deg, #0b8cff, #0059d9); }
        .floating-contact__icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 100%;
            border-radius: inherit;
            font-size: 27px;
        }
        .floating-contact__icon--zalo {
            font-family: Arial, sans-serif;
            font-size: 13px;
            font-weight: 800;
            letter-spacing: -.4px;
        }
        .floating-contact__label {
            position: absolute;
            right: calc(100% + 12px);
            top: 50%;
            padding: 7px 11px;
            border-radius: 8px;
            background: rgba(17,24,39,.94);
            color: #fff;
            font-size: 13px;
            font-weight: 700;
            line-height: 1.2;
            white-space: nowrap;
            box-shadow: 0 6px 18px rgba(17,24,39,.16);
            opacity: 0;
            pointer-events: none;
            transform: translate(8px, -50%);
            transition: opacity .2s ease, transform .2s ease;
        }
        .floating-contact__button:hover,
        .floating-contact__button:focus-visible {
            color: #fff;
            transform: translateY(-3px) scale(1.06);
            box-shadow: 0 12px 28px rgba(17,24,39,.3), inset 0 0 0 1px rgba(255,255,255,.25);
        }
        .floating-contact__button:hover .floating-contact__label,
        .floating-contact__button:focus-visible .floating-contact__label {
            opacity: 1;
            transform: translate(0, -50%);
        }
        .floating-contact__button:focus-visible { outline: 3px solid var(--primary-gold); outline-offset: 5px; }
        @keyframes floatingContactPulse {
            0% { transform: scale(.86); opacity: .32; }
            75%, 100% { transform: scale(1.18); opacity: 0; }
        }
        @media (max-width: 575px) {
            .floating-contact { right: max(14px, env(safe-area-inset-right)); bottom: max(18px, env(safe-area-inset-bottom)); gap: 12px; }
            .floating-contact__button { width: 54px; height: 54px; }
            .floating-contact__label { display: none; }
        }
        @media (prefers-reduced-motion: reduce) {
            .floating-contact__button::before { animation: none; }
        }

        /* Responsive Overrides */
        @media (max-width: 1024px) {
            .open-letter-wrapper { flex-direction: column; padding: 30px; gap: 20px; }
            .open-letter-image { flex: 0 0 500px; transform: none; box-shadow: var(--shadow-md); min-height: 500px; margin-bottom: 20px; width: 100%; border-width: 4px; }
            .open-letter-image:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
            .open-letter-content { padding: 20px; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-bar { grid-template-columns: repeat(2, 1fr); gap: 20px; padding: 30px; }
            .stat-item:nth-child(2)::after { display: none; }
            .stat-item::after { display: none; }
            .modal-course-details { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .mobile-toggle { display: block; }
            nav.desktop-nav { display: none; }

            .hero { padding: 120px 0 160px; border-radius: 0 0 24px 24px; }
            .hero h1, .hero h2 { font-size: 40px; }
            .hero-buttons { flex-direction: column; width: 100%; padding: 0 20px; }
            .cta-button, .secondary-button { width: 100%; text-align: center; }
            
            .section-padding { padding: 80px 0; }
            .open-letter-content { padding: 30px 20px; }
            .letter-title { font-size: 32px; }
            .stats-wrapper { margin-top: -60px; }
            .features-grid { grid-template-columns: 1fr; }
            
            .progress-visual { flex-direction: column; gap: 30px; }
            .progress-visual::before { display: none; }
            .progress-step { display: flex; align-items: center; gap: 20px; text-align: left; width: 100%; }
            .step-dot { margin: 0; flex-shrink: 0; }
            
            .about-content { padding: 30px 20px; }
            .bento-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
            .bento-large { grid-row: auto; height: 300px; }
            .bento-item { height: 250px; }
            .certificate-item-horizontal { flex-direction: column; height: auto; }
            .certificate-img-horizontal { width: 100%; height: 200px; }
            .certificates-grid { grid-template-columns: 1fr 1fr; }
            
            .dev-container { grid-template-columns: 1fr; gap: 30px; }
            
            footer { border-radius: 30px 30px 0 0; }
            .footer-container { grid-template-columns: 1fr; gap: 40px; text-align: center; }
            .social-icons { justify-content: center; }
            .footer-links h4::after { left: 50%; transform: translateX(-50%); }
        }
        @media (max-width: 576px) {
            .certificates-grid { grid-template-columns: 1fr; }
            .modal-content { padding: 0; }
            .modal-header { padding: 20px; }
            .modal-body { padding: 20px; }
        }

        /* ===== Bo sung cho frontend dong AVEC (trang Khoa hoc / Chi tiet) ===== */
        .course-search { display: flex; align-items: center; gap: 10px; max-width: 620px; margin: 0 auto 50px; background: var(--primary-white); border: 1px solid var(--border-color); border-radius: var(--radius-pill); padding: 8px 8px 8px 22px; box-shadow: var(--shadow-soft); }
        .course-search i { color: var(--primary-red); }
        .course-search input { flex: 1; border: none; outline: none; font-family: 'Inter', sans-serif; font-size: 15px; background: transparent; color: var(--primary-black); }
        .course-search .cta-button { padding: 10px 26px; flex-shrink: 0; }
        .course-empty { text-align: center; padding: 80px 20px; color: var(--secondary-gray); background: var(--primary-white); border-radius: var(--radius-lg); border: 1px dashed var(--border-color); }
        .course-empty i { font-size: 48px; color: var(--primary-gold); margin-bottom: 16px; }
        .course-pagination { margin-top: 50px; display: flex; justify-content: center; }
        .course-pagination .pagination { margin-bottom: 0; }
        .course-catalog-page { padding-top: 50px; }
        .course-muted { text-align: center; color: var(--secondary-gray); }
        .course-filter-panel { margin-bottom: 34px; }
        .course-filter-panel .course-search { margin-bottom: 18px; }
        .course-filter-row { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr) auto; gap: 14px; align-items: end; max-width: 900px; margin: 0 auto; background: var(--primary-white); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 18px; box-shadow: var(--shadow-soft); }
        .course-filter-label { display: block; font-weight: 700; color: var(--primary-black); font-size: 13px; margin-bottom: 6px; }
        .course-filter-select { width: 100%; border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 11px 14px; background: var(--primary-white); color: var(--primary-black); font-family: 'Inter', sans-serif; }
        .course-filter-select:focus { border-color: var(--primary-red); outline: 0; box-shadow: 0 0 0 3px rgba(186,26,26,.12); }
        .course-filter-actions { display: flex; align-items: center; gap: 12px; }
        .course-filter-actions .btn-outline-web { min-width: 110px; gap: 7px; }
        .course-reset-link { color: var(--primary-dark-red); font-weight: 700; font-size: 14px; text-decoration: none; white-space: nowrap; }
        .course-reset-link:hover { text-decoration: underline; }
        .course-category-pills { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 0 0 28px; }
        .course-category-pills a { display: inline-flex; align-items: center; gap: 8px; padding: 9px 16px; border-radius: var(--radius-pill); background: var(--primary-white); border: 1px solid var(--border-color); color: var(--secondary-gray); text-decoration: none; font-weight: 700; font-size: 13px; transition: var(--transition); }
        .course-category-pills a:hover { color: var(--primary-dark-red); border-color: rgba(186,26,26,.35); transform: translateY(-2px); }
        .course-category-pills a.active { background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); color: #fff; border-color: transparent; box-shadow: 0 10px 20px rgba(139,0,0,.16); }
        .course-catalog-note { background: var(--primary-light-gold); border-left: 4px solid var(--primary-gold); border-radius: var(--radius-sm); color: var(--primary-black); font-size: 14px; line-height: 1.6; padding: 14px 16px; margin: 0 auto 28px; max-width: 900px; }

        .course-detail-page > .container { max-width: 1520px; padding-left: clamp(18px, 3vw, 44px); padding-right: clamp(18px, 3vw, 44px); }
        .course-detail-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 32px; align-items: start; min-width: 0; }
        .course-detail-main { background: var(--primary-white); border-radius: var(--radius-lg); padding: 48px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); min-width: 0; }
        .course-detail-title { font-size: 38px; margin: 14px 0 18px; }
        .course-meta { display: flex; flex-wrap: wrap; gap: 24px; padding-bottom: 22px; margin-bottom: 22px; border-bottom: 1px solid var(--border-color); color: var(--secondary-gray); font-weight: 600; font-size: 15px; }
        .course-meta i { color: var(--primary-red); margin-right: 6px; }
        .course-minimum-summary { display: flex; flex-wrap: wrap; gap: 14px 28px; margin: 0 0 16px; padding: 14px 16px; border-left: 4px solid var(--primary-gold); border-radius: var(--radius-md); background: var(--primary-light-gold); color: var(--secondary-gray); }
        .course-minimum-summary i { color: var(--primary-red); margin-right: 6px; }
        .course-detail-body { color: var(--secondary-gray); font-size: 17px; line-height: 1.85; min-width: 0; }
        .course-detail-body .lead-text { font-size: 19px; color: var(--primary-black); font-weight: 500; margin-bottom: 18px; }
        .course-sec-title { font-size: 22px; margin: 30px 0 14px; display: flex; align-items: center; gap: 10px; }
        .course-sec-title i { color: var(--primary-gold); }
        .course-detail-section { margin-top: 28px; }
        .course-tuition-scroll { overflow-x: auto; max-width: 100%; border: 1px solid var(--border-color); border-radius: var(--radius-md); background: var(--primary-white); }
        .course-tuition-scroll:focus { outline: 3px solid rgba(186,26,26,.14); outline-offset: 3px; }
        .course-tuition-table { width: 100%; min-width: 840px; border-collapse: collapse; font-size: 15.5px; color: var(--primary-black); }
        .course-tuition-table caption { caption-side: top; padding: 14px 18px; color: var(--secondary-gray); text-align: left; font-weight: 600; }
        .course-tuition-table th, .course-tuition-table td { padding: 17px 18px; border-top: 1px solid var(--border-color); vertical-align: top; }
        .course-tuition-table thead th { background: var(--primary-gray); color: var(--primary-dark-red); font-family: 'Montserrat', sans-serif; line-height: 1.35; white-space: normal; }
        .course-tuition-table thead th:nth-child(-n+2) { white-space: nowrap; }
        .course-tuition-table thead th:nth-child(2), .course-tuition-table tbody td:nth-child(2) { min-width: 118px; }
        .course-tuition-table thead th:nth-child(n+3), .course-tuition-table tbody td:nth-child(n+3) { min-width: 150px; }
        .course-tuition-table tbody th { width: 24%; min-width: 170px; font-weight: 800; }
        .course-tuition-table tbody th span { display: block; margin-top: 6px; font-weight: 600; font-size: 13.5px; line-height: 1.55; color: var(--secondary-gray); }
        .course-tuition-table td { white-space: nowrap; font-weight: 700; }
        .course-schedule-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
        .course-schedule-card { background: var(--primary-gray); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 20px; color: var(--primary-black); }
        .course-schedule-card h4 { font-size: 17px; margin-bottom: 8px; }
        .course-schedule-card p { margin-bottom: 10px; font-weight: 700; color: var(--primary-dark-red); }
        .course-schedule-card p i { margin-right: 6px; color: var(--primary-red); }
        .course-schedule-card ul { list-style: none; padding: 0; margin: 0; color: var(--secondary-gray); font-size: 14px; }
        .course-schedule-card li + li { margin-top: 8px; }

        .course-detail-aside { position: sticky; top: 100px; }
        .course-price-card { background: var(--primary-white); border-radius: var(--radius-lg); padding: 30px; box-shadow: var(--shadow-md); border: 1px solid var(--border-color); border-top: 5px solid var(--primary-red); }
        .cpc-label { color: var(--secondary-gray); font-size: 14px; font-weight: 600; }
        .cpc-price { font-family: 'Montserrat', sans-serif; font-weight: 800; font-size: 30px; color: var(--primary-dark-red); margin: 4px 0 20px; }
        .cpc-offers { background: var(--primary-light-gold); border-radius: var(--radius-md); padding: 18px 20px; margin-bottom: 22px; }
        .cpc-offers-title { font-weight: 700; color: var(--primary-dark-red); margin-bottom: 10px; }
        .cpc-offers ul { list-style: none; padding: 0; margin: 0; font-size: 14px; }
        .cpc-offers li { display: flex; gap: 10px; align-items: center; margin-bottom: 8px; color: var(--primary-black); }
        .cpc-offers li i { color: #10B981; }
        .course-confirm-box li { align-items: flex-start; }
        .course-sidebar-button { width: 100%; margin-bottom: 12px; display: flex; align-items: center; justify-content: center; gap: 8px; }
        .btn-outline-web { display: flex; align-items: center; justify-content: center; width: 100%; padding: 13px; border-radius: var(--radius-pill); border: 2px solid var(--primary-red); color: var(--primary-dark-red); background: transparent; font-family: 'Montserrat', sans-serif; font-weight: 600; text-decoration: none; transition: var(--transition); }
        .btn-outline-web:hover { background: var(--primary-red); color: #fff; }
        .cpc-hotline { text-align: center; margin-top: 18px; font-size: 14px; color: var(--secondary-gray); }
        .cpc-hotline i { color: var(--primary-red); margin-right: 6px; }
        .cpc-hotline a { color: var(--primary-dark-red); font-weight: 700; text-decoration: none; }
        .related-courses { margin-top: 70px; }
        .related-title { font-size: 28px; margin-bottom: 30px; }

        /* Tin tuc (news) + bai viet */
        .news-cat-filter { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-bottom: 40px; }
        .news-cat-filter a { padding: 8px 20px; border-radius: var(--radius-pill); background: var(--primary-white); border: 1px solid var(--border-color); color: var(--secondary-gray); text-decoration: none; font-weight: 600; font-size: 14px; transition: var(--transition); }
        .news-cat-filter a:hover { border-color: var(--primary-red); color: var(--primary-dark-red); }
        .news-cat-filter a.active { background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); color: #fff; border-color: transparent; }
        .news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 30px; }
        .news-card { background: var(--primary-white); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); transition: var(--transition); display: flex; flex-direction: column; }
        .news-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-md); border-color: rgba(139,0,0,0.2); }
        .news-card-img { height: 200px; overflow: hidden; }
        .news-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
        .news-card:hover .news-card-img img { transform: scale(1.08); }
        .news-card-body { padding: 24px; flex-grow: 1; display: flex; flex-direction: column; }
        .news-meta { font-size: 13px; color: var(--secondary-gray); margin-bottom: 10px; }
        .news-meta i { color: var(--primary-red); margin-right: 4px; }
        .news-meta .news-cat { color: var(--primary-dark-red); font-weight: 700; }
        .news-card-body h3 { font-size: 19px; margin-bottom: 10px; line-height: 1.4; }
        .news-card-body h3 a { color: var(--primary-black); text-decoration: none; transition: var(--transition); }
        .news-card-body h3 a:hover { color: var(--primary-dark-red); }
        .news-card-body p { color: var(--secondary-gray); font-size: 14px; flex-grow: 1; margin-bottom: 16px; }
        .news-readmore { color: var(--primary-dark-red); font-weight: 700; font-size: 14px; text-decoration: none; }
        .news-readmore i { transition: var(--transition); }
        .news-readmore:hover i { transform: translateX(4px); }

        .article-wrap { display: grid; grid-template-columns: 1fr 320px; gap: 40px; align-items: start; }
        .article-main { background: var(--primary-white); border-radius: var(--radius-lg); padding: 45px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }
        .article-main h1 { font-size: 34px; margin-bottom: 14px; }
        .article-meta { font-size: 14px; color: var(--secondary-gray); padding-bottom: 20px; margin-bottom: 24px; border-bottom: 1px solid var(--border-color); }
        .article-meta i { color: var(--primary-red); margin-right: 4px; }
        .article-cover { width: 100%; max-height: 420px; object-fit: cover; border-radius: var(--radius-md); margin-bottom: 24px; }
        .article-body { color: var(--secondary-gray); font-size: 16px; line-height: 1.85; }
        .article-aside .article-related-card { background: var(--primary-white); border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); position: sticky; top: 100px; }
        .article-related-card h4 { font-size: 18px; margin-bottom: 18px; }
        .article-related-card ul { list-style: none; padding: 0; margin: 0; }
        .article-related-card li { padding: 12px 0; border-bottom: 1px dashed var(--border-color); }
        .article-related-card li:last-child { border-bottom: 0; }
        .article-related-card a { color: var(--primary-black); text-decoration: none; font-weight: 600; font-size: 14px; transition: var(--transition); }
        .article-related-card a:hover { color: var(--primary-dark-red); }
        .article-related-card .ar-date { display: block; font-size: 12px; color: var(--secondary-gray); margin-top: 4px; }
        @media (max-width: 992px) { .article-wrap { grid-template-columns: 1fr; } .article-aside .article-related-card { position: static; } .article-main { padding: 30px 22px; } }

        /* ===== Nut & Form theo tong web (cho cac component dung Bootstrap) ===== */
        .btn-avec-primary, .btn-web-primary {
            background: linear-gradient(135deg, var(--primary-red), var(--primary-dark-red)); color: #fff !important;
            border: none; padding: 13px 30px; border-radius: var(--radius-pill); font-family: 'Montserrat', sans-serif;
            font-weight: 600; box-shadow: 0 10px 20px rgba(139,0,0,.18); transition: var(--transition);
        }
        .btn-avec-primary:hover, .btn-web-primary:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); color: #fff !important; }
        .btn-outline-avec-primary { border: 2px solid var(--primary-red); color: var(--primary-dark-red); background: transparent; border-radius: var(--radius-pill); font-weight: 600; padding: 11px 26px; }
        .btn-outline-avec-primary:hover { background: var(--primary-red); color: #fff; }
        .web-form .form-label { font-weight: 600; color: var(--primary-black); font-size: 14px; margin-bottom: 6px; }
        .web-form .form-control, .web-form .form-select { border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 12px 16px; font-family: 'Inter', sans-serif; font-size: 15px; background: var(--primary-white); }
        .web-form .form-control:focus, .web-form .form-select:focus { border-color: var(--primary-red); box-shadow: 0 0 0 3px rgba(186,26,26,.12); outline: none; }
        .web-card { background: var(--primary-white); border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-soft); border: 1px solid var(--border-color); }

        /* ===== Lien he ===== */
        .contact-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 40px; align-items: start; }
        .contact-grid > * { min-width: 0; }
        .contact-info-item { display: flex; gap: 16px; margin-bottom: 22px; }
        .contact-info-item .ci-icon { width: 48px; height: 48px; flex-shrink: 0; border-radius: 14px; background: var(--primary-light-gold); color: var(--primary-dark-red); display: flex; align-items: center; justify-content: center; font-size: 20px; }
        .contact-info-item h4 { font-size: 16px; margin-bottom: 2px; color: var(--primary-black); }
        .contact-info-item p, .contact-info-item a { color: var(--secondary-gray); font-size: 15px; text-decoration: none; }
        .contact-info-item a:hover { color: var(--primary-dark-red); }
        .contact-map { border: 0; width: 100%; height: 260px; border-radius: var(--radius-md); margin-top: 10px; }
        .campus-map-list { display: grid; gap: 18px; margin-bottom: 26px; }
        .campus-map-card { overflow: hidden; border: 1px solid var(--border-color); border-radius: var(--radius-md); background: var(--primary-white); box-shadow: 0 8px 24px rgba(33, 37, 41, 0.07); }
        .campus-map-header { display: flex; align-items: flex-start; gap: 12px; padding: 16px 16px 14px; }
        .campus-map-header > div { min-width: 0; }
        .campus-map-badge { flex: 0 0 auto; min-width: 44px; padding: 6px 9px; border-radius: 999px; background: var(--primary-dark-red); color: var(--primary-white); font-size: 12px; font-weight: 800; line-height: 1; text-align: center; letter-spacing: 0.03em; }
        .campus-map-header h4 { margin: 0 0 5px; color: var(--primary-dark-red); font-size: 17px; }
        .campus-map-header p { margin: 0; color: var(--secondary-gray); font-size: 14px; line-height: 1.55; overflow-wrap: anywhere; }
        .campus-map-phone { display: inline-flex; align-items: center; gap: 7px; margin-top: 8px; color: var(--primary-dark-red); font-size: 14px; font-weight: 700; text-decoration: none; }
        .campus-map-phone:hover { color: var(--primary-red); text-decoration: underline; }
        .campus-mini-map { display: block; width: 100%; height: 185px; border: 0; border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }
        .campus-map-footer { padding: 11px 16px 13px; }
        .campus-map-footer a { display: inline-flex; align-items: center; gap: 7px; color: var(--primary-dark-red); font-size: 13px; font-weight: 700; text-decoration: none; }
        .campus-map-footer a:hover { color: var(--primary-red); text-decoration: underline; }
        @media (max-width: 992px) { .contact-grid { grid-template-columns: minmax(0, 1fr); } }
        @media (max-width: 575px) { .contact-grid .web-card { padding: 24px; } .campus-mini-map { height: 165px; } .campus-map-header { padding: 14px; } }

        /* ===== Trang phap ly / FAQ / Gallery / Tim kiem ===== */
        .legal-content { color: var(--secondary-gray); font-size: 16px; line-height: 1.85; }
        .legal-content h2 { font-size: 20px; margin: 26px 0 10px; }
        .web-accordion .accordion-item { border: 1px solid var(--border-color); border-radius: var(--radius-md) !important; margin-bottom: 14px; overflow: hidden; }
        .web-accordion .accordion-button { font-family: 'Montserrat', sans-serif; font-weight: 600; color: var(--primary-dark-red); background: var(--primary-white); }
        .web-accordion .accordion-button:not(.collapsed) { color: #fff; background: linear-gradient(135deg, var(--primary-dark-red), var(--primary-red)); box-shadow: none; }
        .web-accordion .accordion-button:focus { box-shadow: 0 0 0 3px rgba(255,193,7,.4); }
        .web-accordion .accordion-button:not(.collapsed)::after { filter: brightness(0) invert(1); }
        .gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
        .gallery-grid a { display: block; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-soft); aspect-ratio: 4/3; }
        .gallery-grid img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
        .gallery-grid a:hover img { transform: scale(1.08); }
        .search-block { margin-bottom: 50px; }
        .search-block h3 { font-size: 22px; margin-bottom: 20px; padding-bottom: 10px; border-bottom: 2px solid var(--primary-light-gold); }

        @media (max-width: 1180px) {
            .course-detail-grid { grid-template-columns: 1fr; }
            .course-detail-aside { position: static; }
            .course-price-card { max-width: 100%; }
        }
        @media (max-width: 992px) {
            .course-detail-main { padding: 30px 22px; }
            .course-filter-row { grid-template-columns: 1fr; }
            .course-filter-actions { align-items: stretch; }
            .course-filter-actions .btn-outline-web { width: auto; flex: 1; }
            .course-card-actions { grid-template-columns: 1fr; }
            .course-card-title-row { flex-direction: column; align-items: flex-start; }
            .course-tuition-table { min-width: 780px; font-size: 15px; }
        }
        @media (max-width: 576px) {
            .course-search { border-radius: var(--radius-md); flex-wrap: wrap; padding: 12px; }
            .course-search input { min-width: 0; flex-basis: calc(100% - 32px); }
            .course-search .cta-button { width: 100%; }
            .course-filter-actions { flex-direction: column; }
            .course-filter-actions .btn-outline-web, .course-reset-link { width: 100%; justify-content: center; text-align: center; }
            .course-category-pills { justify-content: flex-start; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 6px; }
            .course-category-pills a { white-space: nowrap; }
        }