:root {
    --primary-blue: #003366;
    --accent-orange: #f37021;
    --text-dark: #333;
    --text-light: #666;
    --bg-gray: #f8f9fa;
    --white: #ffffff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
}

body {
    line-height: 1.6;
    color: var(--text-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* HEADER */
.header {
    background: #0d1b2a;
    position: sticky;
    top: 0;
    z-index: 999;
  }
  
  .nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
  }
  
  .logo {
    color: #fff;
  }
  
  .menu {
    display: flex;
  }
  
  .menu a {
    color: #fff;
    margin-left: 25px;
    text-decoration: none;
    transition: 0.3s;
  }
  
  .menu a:hover {
    color: #fca311;
  }
  
  .menu-toggle {
    display: none;
    color: #fff;
    font-size: 22px;
    cursor: pointer;
  }
  

/* --- HERO SECTION --- */
.hero {
    background: linear-gradient(rgba(0,51,102,0.8), rgba(0,51,102,0.8)), url('IMG/banner.jpg');
    background-size: cover;
    background-position: center;
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero h1 { font-size: 3rem; margin-bottom: 20px; }
.hero p { font-size: 1.2rem; margin-bottom: 30px; max-width: 800px; margin-left: auto; margin-right: auto; }

/* --- SECTION TITLES --- */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--primary-blue);
    text-transform: uppercase;
    position: relative;
    padding-bottom: 15px;
}

.section-title h2::after {
    content: '';
    width: 60px;
    height: 3px;
    background: var(--accent-orange);
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

/* --- MỤC 4: DỊCH VỤ CỐT LÕI --- */
.services { padding: 80px 0; background: var(--white); }
.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: var(--bg-gray);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    transition: 0.3s;
    border-bottom: 4px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    border-bottom-color: var(--accent-orange);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.service-card img { width: 80px; margin-bottom: 20px; }
.service-card h3 { color: var(--primary-blue); margin-bottom: 15px; }

/* --- MỤC 7 LÝ DO & FORM ĐĂNG KÝ --- */
.reasons-section { padding: 60px 0; background: var(--white); }
.reasons-title {
    text-align: center;
    color: var(--primary-blue);
    margin-bottom: 40px;
    font-size: 24px;
    text-transform: uppercase;
}

.flex-container {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

/* Bên trái: 7 Lý do */
.reasons-left { flex: 1; min-width: 350px; }
.reason-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    position: relative;
}
.reason-number {
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 18px;
    z-index: 2;
    border: 3px solid #eee;
}
.reason-text {
    background: #eef7f9;
    padding: 12px 25px;
    border-radius: 30px;
    margin-left: -20px;
    padding-left: 35px;
    width: 100%;
    color: var(--primary-blue);
    font-weight: bold;
    font-size: 15px;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.05);
}

/* Bên phải: Form đăng ký */
.form-right {
    flex: 1;
    min-width: 350px;
    background: #62b9e6; /* Màu xanh light blue giống ảnh */
    padding: 30px;
    border-radius: 10px;
    color: white;
}
.form-right h3 { text-align: center; margin-bottom: 10px; font-size: 20px; }
.form-right p { font-size: 13px; text-align: center; margin-bottom: 20px; line-height: 1.4; }

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}
.form-group { margin-bottom: 15px; }
.full-width { grid-column: span 2; }

.form-group label { display: block; font-size: 12px; margin-bottom: 5px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
}
.btn-submit {
    grid-column: span 2;
    background: #d90429; /* Đỏ rực */
    color: white;
    border: none;
    padding: 12px;
    font-weight: bold;
    text-transform: uppercase;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}
.btn-submit:hover { background: #b00321; }
/* --- MỤC 5: TIN MỚI NHẤT (TABS) --- */
.news-tabs { padding: 80px 0; background: var(--bg-gray); }
.tabs-header {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.tab-btn {
    padding: 10px 25px;
    border: none;
    background: #ddd;
    cursor: pointer;
    font-weight: bold;
    border-radius: 5px;
    transition: 0.3s;
}

.tab-btn.active { background: var(--primary-blue); color: white; }

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.news-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.news-card img { width: 100%; height: 180px; object-fit: cover; }
.news-card-content { padding: 20px; }
.news-card h4 { font-size: 1.1rem; margin-bottom: 10px; color: var(--primary-blue); }
.news-meta { font-size: 0.8rem; color: #999; }

/* --- MỤC 6: TIN TỨC & SỰ KIỆN --- */
.events { padding: 80px 0; }
.events-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 30px;
}

.featured-event {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
}

.featured-event img { width: 100%; height: 100%; object-fit: cover; }
.featured-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(0,51,102,0.9);
    color: white;
    padding: 20px;
}

.event-item {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
}

.event-item img { width: 100px; height: 70px; object-fit: cover; border-radius: 5px; }

/* --- MỤC 7: ĐỐI TÁC --- */
.partners { padding: 60px 0; text-align: center; background: white; }
.partner-logos {
    display: flex;
    justify-content: space-around;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
    filter: grayscale(100%);
    opacity: 0.6;
}

.partner-logos img { max-width: 150px; }

/* --- FOOTER --- */
footer {
    background: var(--primary-blue);
    color: white;
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    margin-bottom: 20px;
    border-left: 3px solid var(--accent-orange);
    padding-left: 10px;
}

.footer-col p { font-size: 0.9rem; margin-bottom: 10px; opacity: 0.8; }
.copyright { text-align: center; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.8rem; }

/* Responsive */
@media (max-width: 768px) {
    .events-container { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}
.about-overview { padding: 80px 0; }
        .flex-row { display: flex; align-items: center; gap: 50px; flex-wrap: wrap; }
        .flex-row div { flex: 1; min-width: 300px; }
        .about-overview h2 { color: var(--primary-blue); font-size: 28px; margin-bottom: 20px; border-left: 5px solid var(--accent-orange); padding-left: 15px; }
        .about-overview p { line-height: 1.8; color: var(--text-dark); margin-bottom: 15px; text-align: justify; }
        .about-img img { width: 100%; border-radius: 10px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); }

        /* --- TẦM NHÌN - SỨ MỆNH --- */
        .vision-mission { background: var(--bg-light); padding: 80px 0; }
        .grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card-box {
            background: var(--white);
            padding: 40px;
            text-align: center;
            border-radius: 8px;
            transition: 0.3s;
            border-top: 5px solid var(--primary-blue);
        }
        .card-box:hover { transform: translateY(-10px); box-shadow: 0 15px 35px rgba(0,0,0,0.1); }
        .card-box h3 { color: var(--accent-orange); margin-bottom: 15px; text-transform: uppercase; }
        .card-box p { font-size: 15px; color: #666; }

        /* --- CON SỐ ẤN TƯỢNG --- */
        .stats { background: var(--primary-blue); color: white; padding: 60px 0; text-align: center; }
        .stats-grid { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 30px; }
        .stat-item h2 { font-size: 40px; color: var(--accent-orange); }
        .stat-item p { text-transform: uppercase; font-size: 14px; letter-spacing: 1px; }

        /* --- MẠNG LƯỚI TOÀN CẦU --- */
        .global-network { padding: 80px 0; text-align: center; }
        .global-network h2 { margin-bottom: 40px; color: var(--primary-blue); }
        .location-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; }
        .location-card {
            background: #fff;
            border: 1px solid #eee;
            padding: 20px;
            border-radius: 8px;
        }
        .location-card h4 { color: var(--accent-orange); margin-bottom: 10px; }

        @media (max-width: 768px) {
            .flex-row { flex-direction: column; }
        }
        /* --- CONTACT HERO --- */
        .contact-hero {
            background: linear-gradient(rgba(0,51,102,0.8), rgba(0,51,102,0.8)), url('IMG/banner.jpg');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 60px 0;
            text-align: center;
        }
        .contact-hero h1 { font-size: 32px; text-transform: uppercase; margin-bottom: 10px; }

        /* --- CONTACT INFO CARDS --- */
        .info-section { padding: 60px 0; background: var(--bg-gray); }
        .info-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }
        .info-card {
            background: var(--white);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border-top: 4px solid var(--accent-orange);
            transition: 0.3s;
        }
        .info-card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0,0,0,0.1); }
        .info-card h3 { color: var(--primary-blue); margin-bottom: 15px; display: flex; align-items: center; gap: 10px; }
        .info-card p { font-size: 14px; color: #555; margin-bottom: 8px; line-height: 1.6; }
        .info-card strong { color: var(--text-dark); }

        /* --- FORM & MAP SECTION --- */
        .form-map-section { padding: 60px 0; background: var(--white); }
        .flex-row { display: flex; gap: 40px; flex-wrap: wrap; }
        .contact-form { flex: 1; min-width: 350px; }
        .contact-map { flex: 1.5; min-width: 350px; border-radius: 10px; overflow: hidden; border: 1px solid #ddd; }

        .form-group { margin-bottom: 20px; }
        .form-group label { display: block; font-size: 14px; font-weight: bold; margin-bottom: 8px; color: var(--primary-blue); }
        .form-group input, .form-group textarea {
            width: 100%;
            padding: 12px;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 14px;
        }
        .form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--accent-orange); }
        
        .btn-send {
            background: var(--primary-blue);
            color: white;
            padding: 12px 30px;
            border: none;
            border-radius: 5px;
            font-weight: bold;
            text-transform: uppercase;
            cursor: pointer;
            transition: 0.3s;
        }
        .btn-send:hover { background: var(--accent-orange); }

        /* --- SOCIAL LINKS --- */
        .social-contact { margin-top: 30px; text-align: center; }
        .social-icons a {
            display: inline-block;
            margin: 0 10px;
            text-decoration: none;
            color: var(--primary-blue);
            font-weight: bold;
            border: 1px solid var(--primary-blue);
            padding: 10px 20px;
            border-radius: 25px;
            transition: 0.3s;
        }
        .social-icons a:hover { background: var(--primary-blue); color: white; }

        @media (max-width: 768px) {
            .flex-row { flex-direction: column; }
            .contact-map { height: 300px; }
        }