/* 1. Reset & Cơ bản */
* { margin: 0; padding: 0; box-sizing: border-box; }

body { 
    font-family: "Times New Roman", Times, serif; 
    line-height: 1.6;
}

/* 2. Cấu trúc Layout (Gộp Header, Menu, Footer) */
.container { display: flex; flex-direction: column; height: 100vh; }

.header { 
    background: url("images/banner.jpg") no-repeat center / 100% 100%; 
    aspect-ratio: 1500 / 200; width: 100%; flex-shrink: 0; 
}

.menu, .footer { background-color: #253746; color: #ffffff; font-family: Arial, sans-serif; }

.menu { flex: 0 0 50px; display: flex; align-items: center; padding-left: 20px; }
.menu a { padding: 10px 20px; color: #ffffff; text-decoration: none; font-size: 14px; transition: 0.3s; }
.menu a:hover { background-color: #3e5b74; color: #ffd700; }

.content { flex: 1; background-color: #ffffff; overflow: hidden; }
.content iframe { width: 100%; height: 100%; border: 0; }

.footer { flex: 0 0 40px; display: flex; justify-content: center; align-items: center; font-size: 13px; border-top: 1px solid #444; }

/* 3. Nội dung Chương trình (f-classes) */
.f-title { color: #1f4aa8; font-size: 26px; font-weight: bold; text-transform: uppercase; margin-bottom: 20px; text-align: left; }

.f-section { 
    color: tomato; font-size: 18px; font-weight: bold; margin-top: 22px; 
    font-family: Arial, sans-serif; border-left: 4px solid tomato; 
    padding-left: 10px; margin-bottom: 10px ; 
}

.f-text, .f-list { margin-left: 15px ; font-size: 16px; margin-bottom: 8px ; }
.f-text { color: #333; line-height: 1.6; }

.f-list { color: black; list-style-type: circle; margin-left: 45px; }
.f-list li { margin-bottom: 6px; }

.f-ol { list-style-type: upper-alpha; margin-left: 20px; }

/* 4. Phần Giới thiệu cá nhân (Intro) */
.intro-body { padding: 20px; background-color: #f4f7f9; }

.intro-container { display: flex; justify-content: space-between; align-items: flex-start; }
.intro-content { flex: 1; order: 1; }

.intro-image { flex: 0 0 180px; order: 2; }
.intro-image img { 
    width: 100%; height: auto; border-radius: 10px; 
    border: 3px solid #1f4aa8; box-shadow: 0 5px 15px rgba(0,0,0,0.1); 
}