:root {
            --navy:    #0b1f4a;
            --navy-mid: #1a3570;
            --accent:  #f4782a;
            --accent-soft: #fff0e5;
            --gold:    #e8b84b;
            --light:   #f8f9fc;
            --text:    #2c3e50;
            --muted:   #6c7a8a;
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }

        body {
            font-family: 'Times New Roman', Times, serif;
            color: var(--text);
            background: #fff;
            overflow-x: hidden;
        }

        h1, h2, h3, .display-font {
            font-family: 'Times New Roman', Times, serif;
        }

        /* ── TOPBAR ── */
        .topbar {
            background: var(--navy);
            font-size: 0.8rem;
            padding: 6px 0;
        }
        .topbar a { color: #cdd8ef; text-decoration: none; }
        .topbar a:hover { color: var(--accent); }
        .topbar .icon-dot { color: var(--accent); margin-right: 6px; }

        /* ── NAVBAR ── */
        .main-nav {
            background: #fff;
            box-shadow: 0 2px 20px rgba(11,31,74,.08);
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .brand-name { font-family: 'Times New Roman', Times, serif; color: var(--navy); font-size: 1.5rem; font-weight: 900; line-height: 1; }
        .brand-sub  { font-size: 0.65rem; color: #c0392b; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
        .logo-ring  { width: 52px; height: 52px; border-radius: 50%; border: 2.5px solid var(--accent); overflow: hidden; flex-shrink: 0; }
        .logo-ring img { width: 100%; height: 100%; object-fit: cover; }

        .nav-link-custom {
            font-size: 0.78rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--text) !important;
            padding: 6px 14px !important;
            border-radius: 6px;
            transition: color .2s, background .2s;
        }
        .nav-link-custom:hover, .nav-link-custom.active {
            color: var(--accent) !important;
            background: var(--accent-soft);
        }

        /* Make header dropdown items use same accent as index */
        .dropdown-menu .dropdown-item {
            color: var(--text);
            font-weight: 700;
            text-transform: none;
            padding-top: 10px;
            padding-bottom: 10px;
            transition: background .15s, color .15s;
            white-space: normal;
        }
        .dropdown-menu .dropdown-item:hover,
        .dropdown-menu .dropdown-item:focus {
            background: var(--accent-soft);
            color: var(--accent);
        }
        .btn-register {
            background: var(--accent);
            color: #fff !important;
            border-radius: 30px;
            font-size: 0.78rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            padding: 9px 22px;
            transition: background .2s, transform .2s;
            text-decoration: none;
        }
        .btn-register:hover { background: #d8621a; transform: translateY(-1px); }

        /* ── HERO BANNER ── */
        .hero {
            background: linear-gradient(120deg, var(--navy) 55%, #163a80 100%);
            min-height: 420px;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute; inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
        }
        .hero-diagonal {
            position: absolute;
            right: -50px; top: 0; bottom: 0;
            width: 55%;
            background: rgba(255,255,255,.04);
            transform: skewX(-8deg);
            pointer-events: none;
        }
        .hero-title {
            font-family: 'Times New Roman', Times, serif;
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 900;
            color: #fff;
            line-height: 1.1;
        }
        .hero-subtitle {
            font-size: 0.9rem;
            letter-spacing: 0.25em;
            text-transform: uppercase;
            color: var(--gold);
            font-weight: 600;
        }
        .breadcrumb-hero { font-size: 0.8rem; }
        .breadcrumb-hero a, .breadcrumb-hero span { color: rgba(255,255,255,.6); }
        .breadcrumb-hero .active { color: var(--accent); }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(244,120,42,.15);
            border: 1px solid rgba(244,120,42,.4);
            color: var(--accent);
            border-radius: 30px;
            padding: 6px 16px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.04em;
        }

        /* ── SECTION LABELS ── */
        .section-label {
            display: inline-block;
            font-size: 0.7rem;
            letter-spacing: 0.18em;
            text-transform: uppercase;
            font-weight: 700;
            color: var(--accent);
            background: var(--accent-soft);
            padding: 4px 14px;
            border-radius: 20px;
            margin-bottom: 12px;
        }
        .section-title {
            font-family: 'Times New Roman', Times, serif;
            font-size: clamp(1.6rem, 3vw, 2.4rem);
            color: var(--navy);
            font-weight: 900;
            line-height: 1.2;
        }
        .divider-line {
            width: 50px; height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--gold));
            border-radius: 2px;
            margin: 14px 0 0;
        }

        /* ── HISTORY TIMELINE ── */
        .timeline { position: relative; padding-left: 0; }
        .timeline::before {
            content: '';
            position: absolute;
            left: 20px; top: 0; bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, var(--accent), var(--gold), transparent);
        }
        .tl-item {
            display: flex;
            gap: 24px;
            margin-bottom: 40px;
            position: relative;
        }
        .tl-dot {
            flex-shrink: 0;
            width: 42px; height: 42px;
            background: var(--navy);
            border: 3px solid var(--accent);
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 700;
            position: relative;
            z-index: 1;
        }
        .tl-content { flex: 1; padding-top: 8px; }
        .tl-year {
            font-size: 0.72rem;
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.1em;
        }
        .tl-content h5 { font-weight: 700; color: var(--navy); margin: 4px 0 6px; font-size: 1rem; }
        .tl-content p { font-size: 0.88rem; color: var(--muted); line-height: 1.7; margin: 0; }

        /* ── STAT CARDS ── */
        .stat-card {
            background: var(--navy);
            border-radius: 16px;
            padding: 28px 20px;
            text-align: center;
            position: relative;
            overflow: hidden;
            transition: transform .3s;
        }
        .stat-card::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent), var(--gold));
        }
        .stat-card:hover { transform: translateY(-5px); }
        .stat-number {
            font-family: 'Times New Roman', Times, serif;
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--gold);
            line-height: 1;
        }
        .stat-unit { font-size: 1.2rem; color: var(--accent); }
        .stat-label { font-size: 0.78rem; color: rgba(255,255,255,.7); text-transform: uppercase; letter-spacing: 0.1em; margin-top: 6px; }

        /* ── TEACHER CARD ── */
        .teacher-wrap {
            background: var(--light);
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 16px 60px rgba(11,31,74,.1);
        }
        .teacher-img-col {
            position: relative;
            background: linear-gradient(160deg, var(--navy-mid), var(--navy));
            min-height: 380px;
            display: flex; align-items: flex-end;
        }
        .teacher-img-col img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.85;
            mix-blend-mode: luminosity;
        }
        .teacher-exp-badge {
            position: absolute;
            top: 20px; right: -14px;
            background: var(--accent);
            color: #fff;
            border-radius: 12px 0 0 12px;
            padding: 12px 20px 12px 16px;
            font-weight: 700;
            font-size: 0.8rem;
            box-shadow: -4px 4px 16px rgba(244,120,42,.4);
        }
        .teacher-exp-badge span { display: block; font-size: 1.8rem; font-family: 'Times New Roman', Times, serif; line-height: 1; }
        .cert-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 1.5px solid #e8edf5;
            border-radius: 10px;
            padding: 10px 14px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text);
            transition: border-color .2s, box-shadow .2s;
        }
        .cert-badge:hover { border-color: var(--accent); box-shadow: 0 4px 14px rgba(244,120,42,.12); }
        .cert-badge i { color: var(--accent); font-size: 1rem; }
        .quote-block {
            background: linear-gradient(135deg, var(--navy) 0%, var(--navy-mid) 100%);
            border-radius: 16px;
            padding: 28px;
            position: relative;
        }
        .quote-block::before {
            content: '"';
            font-family: 'Times New Roman', Times, serif;
            font-size: 5rem;
            color: rgba(244,120,42,.3);
            position: absolute;
            top: -10px; left: 20px;
            line-height: 1;
        }
        .quote-text { color: rgba(255,255,255,.9); font-style: italic; line-height: 1.7; font-size: 0.95rem; padding-top: 10px; }
        .quote-author { color: var(--gold); font-weight: 700; font-size: 0.82rem; margin-top: 12px; }

        /* ── VISION MISSION ── */
        .vm-card {
            border-radius: 20px;
            padding: 32px 28px;
            height: 100%;
            position: relative;
            overflow: hidden;
            transition: transform .3s, box-shadow .3s;
        }
        .vm-card:hover { transform: translateY(-6px); box-shadow: 0 20px 50px rgba(11,31,74,.14); }
        .vm-card.navy { background: var(--navy); color: #fff; }
        .vm-card.orange { background: var(--accent); color: #fff; }
        .vm-card.white { background: #fff; border: 2px solid #e8edf5; }
        .vm-icon {
            width: 64px; height: 64px;
            border-radius: 16px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
        }
        .navy .vm-icon { background: rgba(255,255,255,.1); color: var(--gold); }
        .orange .vm-icon { background: rgba(255,255,255,.2); color: #fff; }
        .white .vm-icon { background: var(--accent-soft); color: var(--accent); }
        .vm-card h4 { font-weight: 800; font-size: 1.05rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 14px; }
        .vm-card p { font-size: 0.88rem; line-height: 1.75; opacity: 0.88; margin: 0; }
        .vm-card.white h4 { color: var(--navy); }
        .vm-card.white p { color: var(--muted); }

        /* ── WHY CHOOSE ── */
        .why-item {
            display: flex;
            gap: 18px;
            align-items: flex-start;
            padding: 22px 20px;
            border-radius: 14px;
            background: #fff;
            border: 1.5px solid #e8edf5;
            transition: border-color .25s, box-shadow .25s, transform .25s;
        }
        .why-item:hover {
            border-color: var(--accent);
            box-shadow: 0 8px 30px rgba(244,120,42,.1);
            transform: translateY(-3px);
        }
        .why-icon {
            flex-shrink: 0;
            width: 50px; height: 50px;
            background: var(--accent-soft);
            border-radius: 12px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.2rem;
            color: var(--accent);
        }
        .why-item h6 { font-weight: 700; color: var(--navy); margin: 0 0 4px; font-size: 0.92rem; }
        .why-item p { font-size: 0.82rem; color: var(--muted); margin: 0; line-height: 1.6; }

        /* ── TESTIMONIALS ── */
        .review-card {
            background: #fff;
            border-radius: 18px;
            padding: 28px;
            border: 1.5px solid #e8edf5;
            box-shadow: 0 4px 20px rgba(11,31,74,.05);
            height: 100%;
            transition: box-shadow .25s;
        }
        .review-card:hover { box-shadow: 0 12px 40px rgba(11,31,74,.1); }
        .star { color: var(--gold); font-size: 0.85rem; }
        .reviewer-name { font-weight: 700; color: var(--navy); font-size: 0.92rem; }
        .reviewer-meta { font-size: 0.75rem; color: var(--muted); }
        .review-text { font-size: 0.87rem; color: var(--text); line-height: 1.7; font-style: italic; }
        .reviewer-av {
            width: 44px; height: 44px;
            border-radius: 50%;
            background: var(--navy);
            display: flex; align-items: center; justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            flex-shrink: 0;
        }

        /* ── CTA BAND ── */
        .cta-band {
            background: linear-gradient(120deg, var(--navy) 0%, #1a3a80 50%, #0e2558 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-band::before {
            content: '';
            position: absolute;
            width: 500px; height: 500px;
            background: radial-gradient(circle, rgba(244,120,42,.15) 0%, transparent 70%);
            right: -100px; top: 50%;
            transform: translateY(-50%);
        }
        .btn-cta-main {
            background: var(--accent);
            color: #fff;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 14px 36px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: background .2s, transform .2s;
        }
        .btn-cta-main:hover { background: #d8621a; color: #fff; transform: translateY(-2px); }
        .btn-cta-outline {
            border: 2px solid rgba(255,255,255,.35);
            color: #fff;
            border-radius: 50px;
            font-weight: 700;
            font-size: 0.9rem;
            padding: 12px 28px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: background .2s, border-color .2s;
        }
        .btn-cta-outline:hover { background: rgba(255,255,255,.08); border-color: #fff; color: #fff; }

        /* ── FOOTER ── */
        footer { background: #07152e; color: rgba(255,255,255,.75); }
        footer h6 { color: var(--accent); font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.78rem; border-bottom: 1px solid rgba(255,255,255,.08); padding-bottom: 10px; margin-bottom: 18px; }
        footer a { color: rgba(255,255,255,.65); text-decoration: none; font-size: 0.85rem; display: block; margin-bottom: 9px; transition: color .2s; }
        footer a:hover { color: var(--accent); }
        footer .footer-info li { font-size: 0.85rem; margin-bottom: 12px; display: flex; gap: 10px; align-items: flex-start; }
        footer .footer-info i { color: var(--accent); margin-top: 2px; flex-shrink: 0; font-size: 0.9rem; }
        .footer-copy { border-top: 1px solid rgba(255,255,255,.07); font-size: 0.78rem; color: rgba(255,255,255,.35); text-align: center; padding-top: 20px; margin-top: 40px; }

        /* ── FLOATING ── */
        .floats { position: fixed; bottom: 20px; right: 20px; z-index: 1050; display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
        .zalo-btn { width: 48px; height: 48px; border-radius: 50%; background: #fff; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 20px rgba(0,0,0,.2); transition: transform .2s; }
        .zalo-btn:hover { transform: scale(1.1); }
        .zalo-btn img { width: 32px; border-radius: 50%; }
        .phone-btn {
            display: flex; align-items: center; gap: 10px;
            background: var(--accent);
            color: #fff;
            border-radius: 30px;
            padding: 6px 8px 6px 18px;
            font-weight: 700;
            font-size: 0.82rem;
            text-decoration: none;
            box-shadow: 0 6px 24px rgba(244,120,42,.45);
            transition: background .2s;
        }
        .phone-btn:hover { background: #d8621a; color: #fff; }
        .phone-btn .phone-circle { width: 36px; height: 36px; background: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
        .phone-btn .phone-circle i { color: var(--accent); font-size: 0.9rem; animation: ring 1.5s infinite; }
        @keyframes ring { 0%,100%{transform:rotate(0)} 15%{transform:rotate(15deg)} 30%{transform:rotate(-10deg)} 45%{transform:rotate(10deg)} 60%{transform:rotate(-5deg)} }

        /* ── MISC ── */
        section { padding-top: 80px; padding-bottom: 80px; }
        .bg-light-custom { background: var(--light); }
        .text-accent { color: var(--accent); }
        .text-navy { color: var(--navy); }
        .fw-800 { font-weight: 800; }

        /* Mobile nav */
        .navbar-toggler { border: 1.5px solid var(--navy); padding: 6px 10px; }
        .navbar-toggler-icon { background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%230b1f4a' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e"); }

        @media (max-width: 767px) {
            section { padding-top: 54px; padding-bottom: 54px; }
            .timeline::before { left: 18px; }
            .teacher-img-col { min-height: 260px; }
            .stat-number { font-size: 2.2rem; }
        }

        /*Nhấn mạnh để ảnh có màu */
        /* Loại bỏ mọi bộ lọc màu có thể đang áp dụng lên ảnh */
        .teacher-img-col img {
            filter: none !important;
            mix-blend-mode: normal !important;
            opacity: 1 !important;
        }

        /* Nếu có lớp phủ màu giả lập phía trên ảnh, hãy ẩn nó đi */
        .teacher-img-col::before, 
        .teacher-img-col::after {
            display: none !important;
        }


        /* Căn chỉnh các icon kích thước bằng nhau */
        .float-icon-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff !important;
            font-size: 20px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            transition: transform 0.3s ease;
            text-decoration: none;
        }

        .float-icon-btn:hover {
            transform: scale(1.1);
            color: #fff;
        }

        /* Màu riêng cho từng nút */
        .maps-btn {
            background: #dc3545; /* Đỏ Google */
            border: 3px solid #f8d7da;
        }

        .messenger-btn {
            background: #0084ff; /* Xanh Messenger */
            border: 3px solid #cce6ff;
        }

        /* Tùy chỉnh thêm cho cụm floats nếu cần */
       .floats {
        display: flex;
        flex-direction: column;
        align-items: flex-end;
        gap: 12px;
        position: fixed;
        bottom: 20px;
        right: 15px; /* Giảm một chút để an toàn trên màn hình nhỏ */
        z-index: 9999; /* Đảm bảo luôn nằm trên cùng */
        pointer-events: auto;
    }

/* Đảm bảo nút Phone không quá dài trên điện thoại cực nhỏ */
        @media (max-width: 360px) {
            .phone-btn span {
                display: none; /* Chỉ hiện icon phone nếu màn hình quá bé */
            }
            .phone-btn {
                padding: 8px;
                width: 48px;
                height: 48px;
                justify-content: center;
            }
        }



        /* ─── BỔ SUNG CHỨC NĂNG RESPONSIVE (PHONE - TABLET - PC) ─── */

        /* 1. Tối ưu hình ảnh không bị vỡ/méo */
        img {
            max-width: 100%;
            height: auto;
            object-fit: cover;
        }
        /* Chống tràn tuyệt đối */
        html, body {
            max-width: 100%;
            overflow-x: hidden;
            position: relative;
        }

        /* Fix lỗi các phần tử có width 100% cộng thêm padding/margin */
        .row {
            margin-left: 0;
            margin-right: 0;
        }

        /* Fix lỗi ảnh hoặc iframe bản đồ vượt quá màn hình */
        img, iframe {
            max-width: 100%;
            height: auto;
        }

        /* 2. Điều chỉnh cho màn hình lớn (PC/Laptop lớn) */
        @media (min-width: 1400px) {
            .container { max-width: 1320px; }
            .hero-title { font-size: 4rem; }
        }

        /* 3. Điều chỉnh cho Laptop và Tablet (992px - 1199px) */
        @media (max-width: 1199px) {
            .nav-link-custom { padding: 6px 8px !important; font-size: 0.7rem; }
            .teacher-img-col { min-height: 450px; }
        }

        /* 4. Điều chỉnh cho Tablet và điện thoại xoay ngang (768px - 991px) */
        @media (max-width: 991px) {
            .hero { min-height: 350px; text-align: center; }
            .hero-diagonal { width: 0; } /* Ẩn vệt chéo để tránh đè chữ trên mobile */
            .breadcrumb-hero { justify-content: center; display: flex; }
            .teacher-img-col { min-height: 400px; }
            .stat-card { padding: 20px 10px; }
            .stat-number { font-size: 2rem; }
            
            /* Navbar Mobile */
            .navbar-collapse {
                background: #fff;
                padding: 20px;
                border-radius: 10px;
                box-shadow: 0 10px 30px rgba(0,0,0,0.1);
                margin-top: 10px;
            }
        }

        /* 5. Điều chỉnh cho Điện thoại (Dưới 767px) */
        @media (max-width: 767px) {
            section { padding-top: 40px; padding-bottom: 40px; }
            
            /* Hero Mobile */
            .hero-title { font-size: 1.8rem; }
            .hero-badge { font-size: 0.7rem; padding: 4px 12px; }

            /* Tránh vỡ Stats */
            .stat-card { margin-bottom: 10px; }
            .stat-number { font-size: 1.8rem; }
            
            /* Timeline Mobile */
            .timeline::before { left: 15px; }
            .tl-dot { width: 32px; height: 32px; font-size: 0.7rem; }
            .tl-item { gap: 15px; }

            /* Giảng viên & Quote */
            .teacher-img-col { min-height: 300px; }
            .quote-block { padding: 20px; }
            .quote-text { font-size: 0.85rem; }

            /* Floating Buttons Mobile */
            .phone-btn span { display: none; } /* Chỉ hiện icon tròn trên mobile nhỏ */
            .phone-btn { padding: 8px; border-radius: 50%; width: 48px; height: 48px; justify-content: center; }
            .floats { right: 10px; bottom: 10px; gap: 8px; }
            
            /* Review Card */
            .review-card { padding: 20px; }
        }

        /* 6. Tối ưu cho điện thoại siêu nhỏ (iPhone SE, etc.) */
        @media (max-width: 375px) {
            .brand-name { font-size: 1.2rem; }
            .hero-title { font-size: 1.5rem; }
            .btn-cta-main, .btn-cta-outline { width: 100%; justify-content: center; }
        }

        .tiktok-btn {
        background: #010101; /* Đen TikTok */
        border: 3px solid #e0e0e0;
}