/* Reset margin, padding, box-sizing cho toàn bộ trang */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #f5f5f5;
    font-family: Arial, sans-serif;
}

/* Định dạng khung chứa chính */
.container {
    width: 100%;
}

/* Menu full width */
.menu {
    width: 100%;
    background-color: black;
}

.menu-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Header full width */
.container > header {
    background-image: url('IMG/Bookstore_Banner_Template.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 800px;
    width: 100%;
}

/* Slider container full width */
.slider-container {
    width: 100%;
    background: white;
    padding: 20px 0;
    margin-bottom: 20px;
}

.slider-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
    padding: 0 15px;
}

/* Content wrapper cho article và aside */
.content-wrapper {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 20px;
    padding: 0 15px;
}

/* Định dạng article và aside */
.content-wrapper > article {
    flex: 1;
    min-height: 400px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 20px;
    margin-top: 20px;
}

.content-wrapper > aside {
    width: 300px;
    min-height: 400px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 15px;
    margin-top: 20px;
}

/* Footer full width */
.container > footer {
    width: 100%;
    border-top: 5px solid black;
    height: auto;
    min-height: 230px;
    background-color: lightcyan;
    margin-top: 30px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    padding: 20px 15px;
}

/* Định dạng tiêu đề */
h3 {
    text-align: center;
    margin-bottom: 20px;
}

footer h3 {
    text-align: left;
    margin-bottom: 10px;
}

/* Đường ngăn cách */
.divider {
    width: 100%;
    height: 0;
    border-bottom: 2px solid #ccc;
    margin: 0;
}