/*
Theme Name: SEO Theme Đăng Ký XOSO66
Author: AI Generator
Description: SEO Optimized WordPress Theme for XOSO66 Registration
Version: 1.0
Text Domain: seo-theme-dang-ky-xoso66
*/

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo h1 {
    font-size: 32px;
    font-weight: bold;
    margin: 0;
}

.logo h1 a {
    color: #fff;
    text-decoration: none;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.logo h1 a:hover {
    opacity: 0.9;
}

/* Navigation Menu */
nav {
    flex: 1;
    display: flex;
    justify-content: center;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 5px;
    margin: 0;
    padding: 0;
}

nav ul li {
    position: relative;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    padding: 10px 18px;
    border-radius: 5px;
    transition: all 0.3s ease;
    display: block;
    font-size: 15px;
}

nav ul li a:hover,
nav ul li.current-menu-item a,
nav ul li.current_page_item a {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* Dropdown Menu */
nav ul li ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    border-radius: 5px;
    padding: 10px 0;
    min-width: 200px;
    flex-direction: column;
    gap: 0;
    z-index: 999;
}

nav ul li:hover ul {
    display: flex;
}

nav ul li ul li a {
    color: #333;
    padding: 12px 20px;
    font-size: 14px;
}

nav ul li ul li a:hover {
    background: #667eea;
    color: #fff;
}

nav ul li ul li::after {
    display: none;
}

/* Submenu indicator */
nav ul li.menu-item-has-children > a::after {
    content: ' ▼';
    font-size: 10px;
    margin-left: 5px;
}

nav ul li ul li.menu-item-has-children > a::after {
    content: ' ▶';
    float: right;
}

.auth-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    padding: 10px 15px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    display: inline-block;
}

.btn-login {
    background: transparent;
    border: 2px solid #fff;
    color: #fff;
}

.btn-login:hover {
    background: #fff;
    color: #667eea;
}

.btn-register {
    background: #ff6b6b;
    border: 2px solid #ff6b6b;
    color: #fff;
}

.btn-register:hover {
    background: #ff5252;
    border-color: #ff5252;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 100px 0;
    text-align: center;
}

.hero h2 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero .btn-register {
    font-size: 22px;
    padding: 15px 50px;
}

/* Information Section */
.info-section {
    padding: 80px 0;
    background: #fff;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.info-card {
    background: #f9f9f9;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
}

.info-card:hover {
    transform: translateY(-5px);
}

.info-card h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #667eea;
}

/* Content Section */
.content-section {
    padding: 80px 0;
}

.content-section h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 40px;
    color: #667eea;
}

.content-box {
    background: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.content-box h3 {
    font-size: 28px;
    margin: 30px 0 15px;
    color: #764ba2;
}

.content-box p {
    margin-bottom: 20px;
    line-height: 1.8;
}

/* Article List */
.article-list {
    padding: 80px 0;
    background: #fff;
}

.article-list h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 40px;
    color: #667eea;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.article-card {
    background: #f9f9f9;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-card-content {
    padding: 25px;
}

.article-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #667eea;
}

.article-card p {
    color: #666;
    margin-bottom: 20px;
}

.article-card .btn {
    background: #667eea;
    color: #fff;
}

/* Footer */
footer {
    background: #2d3748;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #667eea;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-column ul li a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #4a5568;
    color: #ccc;
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
        position: relative;
    }
    
    .logo {
        width: 100%;
        text-align: center;
    }
    
    nav {
        width: 100%;
        justify-content: center;
    }
    
    nav ul {
        flex-direction: column;
        text-align: center;
        gap: 5px;
        display: block;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    nav ul.active {
        max-height: 500px;
        overflow: visible;
    }
    
    nav ul li a {
        padding: 12px 15px;
    }
    
    nav ul li ul {
        position: static;
        box-shadow: none;
        background: rgba(255,255,255,0.1);
    }
    
    nav ul li ul li a {
        color: #fff;
    }
    
    .auth-buttons {
        width: 100%;
        justify-content: center;
        margin-top: 10px;
    }
    
    /* Mobile Menu Toggle */
    .menu-toggle {
        display: block !important;
        position: absolute;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        background: transparent;
        border: none;
        color: #fff;
        font-size: 24px;
        cursor: pointer;
        padding: 10px;
        z-index: 1001;
    }
    
    .menu-toggle:hover {
        background: rgba(255,255,255,0.1);
        border-radius: 5px;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .info-grid,
    .article-grid,
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* Desktop - hide mobile menu toggle */
@media (min-width: 769px) {
    .menu-toggle {
        display: none !important;
    }
}