/* ===========================
   1. RESET CƠ BẢN
============================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  height: 100%;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f5f5f5;
  color: #333;
}
main a {
  text-decoration: none;
  color: #3905f4;
}
a {
  text-decoration: none;
  color: #333;
}
ul {
  list-style: circle;
  padding-left: 1.2rem;
}
ul li {
  margin-bottom: 0.5rem;
}
ul ul {
  list-style: disc;
  padding-left: 1.5rem;
}
ul ul ul {
  list-style: square;
  padding-left: 2rem;
}
ol {
  padding-left: 1.2rem;
}
ol li {
  margin-bottom: 0.5rem;
}
ol ul {
  list-style: circle;
  padding-left: 1.5rem;
}
li {
  margin-bottom: 0.5rem;
  margin-top: 0.5rem;
}
pre {
  background: #220397;
  padding: 10px;
  overflow-x: auto;
}
pre code {
  padding: 2px 4px;
  font-family: "Times New Roman", Times, serif;
  color: #ffff;
}
li pre code {
  padding: 2px 4px;
  font-family: "Times New Roman", Times, serif;
  color: #ffff;
}
li code {
  padding: 2px 4px;
  font-family: "Times New Roman", Times, serif;
  color: #220397;
  font-weight: bold;
}
p code {
  padding: 2px 4px;
  font-family: "Times New Roman", Times, serif;
  color: #220397;
  font-weight: bold;
}
/* ===========================
   2. HEADER
============================ */
header {
  background-color: #220397;
  color: #fff;
  padding: 0.5rem 1rem;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
}
header .header-container h1 {
  font-size: 1.5rem;
  margin-left: 0.5rem;
}
header .header-container h1 a {
  color: #fff;
}
header .header-container button#menu-toggle {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: #fff;
  cursor: pointer;
}
header .header-container .user-info span {
  color: #fff;
  font-weight: 500;
  margin-right: 1rem;
}
header .header-container .user-info button#logout-btn {
  background-color: #ff4d4f;
  border: none;
  color: #fff;
  padding: 0.4rem 0.8rem;
  border-radius: 4px;
  font-size: 0.9rem;
  cursor: pointer;
}

/* ===========================
   3. BODY LAYOUT CHUNG
============================ */
.container {
  display: flex;
  margin-top: 60px; /* chừa chỗ cho header */
  min-height: calc(100vh - 60px);
  background-color: #fdfdfd;
}

/* ===========================
   4. SIDEBAR (ASIDE)
============================ */
aside#sidebar {
  width: 250px;
  background-color: #ffffff;
  border-right: 1px solid #ddd;
  padding: 1rem;
  overflow-y: auto;
  flex-shrink: 0;
  transition: transform 0.3s ease-in-out;
}
aside .search-box {
  margin-bottom: 1rem;
}
aside input[type="text"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #bbb;
  border-radius: 4px;
}
aside nav ul li {
  margin-bottom: 0.5rem;
}
aside nav ul li a {
  display: block;
  padding: 0.4rem 0.5rem;
  border-radius: 4px;
  transition: background 0.2s;
}
aside nav ul li a:hover {
  background-color: #eef6ff;
}
/* Class để bôi đen link hiện tại */
aside nav ul li a.active-link {
  font-weight: bold;
  background-color: #eef6ff;
  border-radius: 4px;
  padding: 0.2rem 0.4rem;
}

/* ===========================
   5. MAIN CONTENT
============================ */
main#content {
  flex-grow: 1;
  padding: 1.5rem;
}
main article h1 {
  font-size: 2rem;
  color: #220397;
}
main article h2 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
  color: #004080;
}
main article h3 {
  font-size: 1.3rem;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  color: #004080;
}
main article p {
  line-height: 1.6;
  margin-bottom: 1rem;
}
main article pre {
  background-color: #272822;
  color: #f8f8f2;
  padding: 1rem;
  border-radius: 5px;
  overflow-x: auto;
  margin-bottom: 1rem;
}
main article code {
  font-family: "Courier New", Courier, monospace;
  font-size: 0.95rem;
}
main article img {
  max-width: 100%;
  margin: 1rem 0;
  display: block;
}

/* ===========================
   6. FOOTER
============================ */
footer {
  background-color: #220397;
  color: #fff;
  text-align: center;
  padding: 0.8rem 1rem;
  margin-top: 1rem;
}

/* ===========================
   7. RESPONSIVE (Mobile)
============================ */
@media (max-width: 768px) {
  header .header-container {
    flex-direction: row;
    justify-content: space-between;
  }
  header .header-container .user-info {
    display: none; /* ẩn user-info trên mobile nếu muốn */
  }
  aside#sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    height: calc(100% - 60px);
    transform: translateX(-100%);
    z-index: 999;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
  }
  aside#sidebar.open {
    transform: translateX(0);
  }
  .container {
    flex-direction: column;
  }
  main#content {
    padding: 1rem;
    margin-top: 0;
  }
  .ads-section .ad-slot {
    flex: 1 1 100%;
    width: 100%;
  }
}

/* ================================
   Style cho Ads Section
================================ */
.ads-section {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
}
.ads-section .ad-slot {
  flex: 1 1 calc(33.333% - 1rem);
  min-width: 200px;
  background-color: #fafafa;
  border: 1px solid #ddd;
  padding: 0.5rem;
  text-align: center;
  justify-content: center;
}

/* Language selector styling */
.lang-selector {
  margin-left: 1rem;
}
.lang-selector select {
  padding: 0.2rem 0.4rem;
  border: 1px solid #bbb;
  border-radius: 4px;
  background: #fff;
  font-size: 0.9rem;
  cursor: pointer;
}

/* Ẩn banner frame của Google Translate */
.goog-te-banner-frame.skiptranslate {
  display: none;
}
body {
  top: 0;
}

/* Ẩn logo “Powered by Google” và widget gốc */
.goog-logo-link,
.goog-logo-link:hover,
.goog-te-gadget-icon {
  display: none;
}