/* Thiết lập chung */
:root {
    --primary-red: #c62828; /* Đỏ đun - Màu may mắn */
    --secondary-green: #2e7d32; /* Xanh lá - Màu bánh Tét */
    --gold: #ffb300; /* Vàng - Hoa mai */
    --bg-light: #fff9e6;
    --text-color: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: #fff;
    color: var(--text-color);
    line-height: 1.6;
}

/* Header & Menu */
header {
    background-color: var(--primary-red);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 10px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 10px 15px;
    font-weight: bold;
    border-radius: 5px;
    transition: 0.3s;
}

nav a:hover,
nav a.active {
    background-color: var(--gold);
    color: var(--primary-red);
}

/* Các Section chung */
section {
    padding: 60px 20px;
    max-width: 1100px;
    margin: auto;
}

.bg-light {
    background-color: var(--bg-light);
    border-radius: 10px;
}

h2 {
    color: var(--primary-red);
    text-align: center;
    margin-bottom: 30px;
    text-transform: uppercase;
    font-size: 2em;
}

h2::before { content: '🌸 '; }
h2::after { content: ' 🌸'; }

.content-box {
    text-align: justify;
    font-size: 1.1em;
    padding: 20px;
    background: white;
    border-left: 5px solid var(--secondary-green);
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    border-radius: 5px;
}

/* Banner Trang chủ */
.banner {
    max-width: 100%;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(rgba(198, 40, 40, 0.7), rgba(46, 125, 50, 0.7)), url('https://via.placeholder.com/1200x800/c62828/fff?text=Anh+Nen+Tet') no-repeat center center/cover;
    color: white;
}

.banner h1 {
    font-size: 3.5em;
    color: var(--gold);
    text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
    margin-bottom: 20px;
}

.banner p { font-size: 1.2em; }
.banner .quote { font-style: italic; margin-top: 20px; font-weight: 300; }

/* Lưới hiển thị (Grid) */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-top: 4px solid var(--gold);
}

.card h3 { color: var(--secondary-green); margin-bottom: 10px; border-bottom: 1px dashed #ccc; padding-bottom: 5px;}
.card ul { padding-left: 20px; }
.card li { margin-bottom: 8px; }

/* Ẩm thực */
.food-item {
    text-align: center;
    background: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.food-item:hover { transform: translateY(-5px); }
.food-item img { width: 100%; height: 200px; object-fit: cover; }
.food-item h3 { color: var(--primary-red); margin: 15px 0 5px; }
.food-item p { padding: 0 15px 15px; font-size: 0.95em; }

/* Media/Hình ảnh */
.media-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 10px;
    border: 3px solid var(--gold);
}

/* Liên hệ */
.contact-container {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.contact-form, .map-container { flex: 1; min-width: 300px; }
input, textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    background-color: var(--primary-red);
    color: white;
    border: none;
    padding: 12px 20px;
    font-size: 1.1em;
    cursor: pointer;
    border-radius: 5px;
    font-weight: bold;
    width: 100%;
    transition: 0.3s;
}

button:hover { background-color: var(--secondary-green); }

/* Footer */
footer {
    background-color: var(--primary-red);
    color: white;
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
}

.student-info {
    max-width: 400px;
    margin: auto;
    background: rgba(255,255,255,0.1);
    padding: 20px;
    border-radius: 10px;
    border: 1px solid var(--gold);
    text-align: left;
}
.student-info p { margin-bottom: 5px; }
.student-info strong { color: var(--gold); }