/*
Theme Name: Simple Archive
Theme URI: https://example.com/
Author: Symbian Archive Team
Author URI: https://example.com/
Description: A clean, lightweight, sidebar-free WordPress theme designed for archives, documentation, and technical knowledge bases.
Version: 1.0.0
License: GNU General Public License v2 or later
Text Domain: simple-archive
*/

/* Reset cơ bản */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  background-color: #f4f4f4;
  color: #222222;
}

/* Header màu nền trắng nhạt */
.header-top {
  background-color: #f2f2f2;
  padding: 35px 20px;
  text-align: center;
  border-bottom: 1px solid #e0e0e0;
}

/* Container xếp ngang logo và title, căn giữa header */
.brand-container {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.brand-container a {
  text-decoration: none;
  color: inherit;
  display: inline-flex;
  align-items: center;
  gap: 16px;
}

/* Style cho Logo PNG */
.brand-logo {
  height: 55px;
  width: auto;
  display: block;
  object-fit: contain;
}

/* Hero Title */
.hero-title {
  font-size: 46px;
  font-weight: 800;
  color: #111111;
  letter-spacing: -1px;
  line-height: 1;
  white-space: nowrap;
}

.hero-title a {
  color: #111111;
  text-decoration: none;
}

/* Main Navigation bar - Căn giữa & Hỗ trợ Dropdown Submenu */
.main-nav {
  background: linear-gradient(180deg, #2c2c2c 0%, #1a1a1a 100%);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: 1px solid #3d3d3d;
  border-bottom: 1px solid #000000;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 999;
}

.menu-list {
  display: flex;
  list-style: none;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 0;
}

.menu-list li {
  position: relative;
}

.menu-list li a {
  display: block;
  padding: 16px 22px;
  color: #ffffff;
  text-decoration: none;
  font-size: 17px;
  font-weight: 600;
  transition: background-color 0.2s ease, color 0.2s ease;
  white-space: nowrap;
}

.menu-list li a:hover,
.menu-list li.current-menu-item > a,
.menu-list li.current-menu-ancestor > a {
  background-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

/* ==========================================
   NÂNG CẤP XỔ RA SANG BÊN TRÁI VÔ HẠN DÀNH CHO SUBITEMS
   ========================================== */

/* Submenu Cấp 1 (mặc định sổ thẳng xuống dưới) */
.menu-list ul.sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #1a1a1a;
  min-width: 220px;
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid #3d3d3d;
  border-top: 2px solid #0066cc;
  box-shadow: 0 5px 12px rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.2s ease-in-out;
  z-index: 1000;
}

/* Tất cả Submenu từ Cấp 2 trở đi (sổ sang bên TRÁI vô hạn) */
.menu-list ul.sub-menu ul.sub-menu {
  top: 0;
  left: auto;
  right: 100%;
  border-top: 1px solid #3d3d3d;
  transform: translateX(-10px);
}

/* Kích hoạt hiển thị khi Hover vào Item cha */
.menu-list li:hover > ul.sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) translateX(0);
}

.menu-list ul.sub-menu li {
  width: 100%;
  border-bottom: 1px solid #2a2a2a;
}

.menu-list ul.sub-menu li:last-child {
  border-bottom: none;
}

.menu-list ul.sub-menu li a {
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 500;
  color: #dddddd;
  text-align: left;
}

.menu-list ul.sub-menu li a:hover {
  background-color: #333333;
  color: #ffffff;
}

/* Mũi tên chỉ hướng Submenu cấp 1 (trỏ xuống) */
.menu-list li.menu-item-has-children > a::after {
  content: ' ▾';
  font-size: 12px;
  margin-left: 5px;
  display: inline-block;
}

/* Đổi mũi tên chỉ sang TRÁI đối với menu con cấp trong */
.menu-list ul.sub-menu li.menu-item-has-children > a::before {
  content: '◂ ';
  float: left;
  margin-right: 5px;
}

.menu-list ul.sub-menu li.menu-item-has-children > a::after {
  content: ''; /* Xóa mũi tên bên phải ở sub-menu */
}

/* Khung tìm kiếm tích hợp gọn ở thanh menu */
.search-box {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 20px;
  padding: 10px 0;
}

.search-box form {
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-box input[type="search"],
.search-box input[type="text"] {
  padding: 8px 12px;
  border: 1px solid #444;
  border-radius: 4px;
  background-color: #111111;
  color: #ffffff;
  outline: none;
  font-size: 15px;
}

.search-box input::placeholder {
  color: #888888;
}

.search-box button,
.search-box input[type="submit"] {
  padding: 8px 14px;
  border: 1px solid #555;
  border-radius: 4px;
  background-color: #3a3a3a;
  color: #ffffff;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.2s ease;
}

.search-box button:hover,
.search-box input[type="submit"]:hover {
  background-color: #555555;
}

/* Nội dung trang - Mở rộng chiều rộng (Béo hơn) */
.main-content {
  max-width: 1150px;
  margin: 40px auto;
  padding: 40px;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.section-title {
  font-size: 30px;
  font-weight: 800;
  color: #111111;
  margin-bottom: 15px;
  margin-top: 25px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eaeaea;
}

.section-title:first-of-type {
  margin-top: 0;
}

.section-title a {
  color: #111111;
  text-decoration: none;
}

.section-title a:hover {
  color: #0066cc;
}

.sub-title {
  font-size: 22px;
  font-weight: 700;
  color: #222222;
  margin: 18px 0 8px 0;
}

/* Đã tăng cỡ chữ văn bản chính */
.content-text,
.main-content p {
  line-height: 1.7;
  color: #444444;
  font-size: 18px; 
  margin-bottom: 15px;
}

.content-text a,
.main-content p a {
  color: #0066cc;
  text-decoration: none;
}

.content-text a:hover,
.main-content p a:hover {
  text-decoration: underline;
}

.main-content ul, 
.main-content ol {
  margin-bottom: 15px;
  padding-left: 25px;
  font-size: 18px;
  color: #444444;
  line-height: 1.7;
}

/* Responsive cơ bản */
@media (max-width: 900px) {
  .main-nav {
    flex-direction: column;
    padding: 10px;
  }
  .search-box {
    margin-left: 0;
    margin-top: 10px;
    width: 100%;
    justify-content: center;
  }
  .hero-title {
    font-size: 32px;
    white-space: normal;
  }
  .main-content {
    margin: 20px 15px;
    padding: 20px;
  }
}