* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --orange-main: #ff6600;
    --orange-dark: #cc5200;
    --orange-light: #ff8533;
    --orange-bg: #fff4ed;
    --text-dark: #333;
    --text-light: #666;
    --white: #ffffff;
    --border: #e0e0e0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

header {
    background-color: var(--orange-main);
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    flex-wrap: wrap;
    align-items: center;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
    padding: 0.5rem 0;
}

.nav-links a:hover {
    opacity: 0.8;
    border-bottom: 2px solid var(--white);
}

.dropdown {
    position: relative;
}

.dropdown-btn {
    background-color: transparent;
    border: none;
    color: var(--white);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 0.5rem 0;
    font-family: inherit;
    transition: opacity 0.3s ease;
}

.dropdown-btn:hover {
    opacity: 0.8;
    border-bottom: 2px solid var(--white);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--white);
    list-style: none;
    min-width: 180px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 4px;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-dark);
    text-decoration: none;
    transition: background-color 0.2s ease;
    border-bottom: none;
}

.dropdown-menu a:hover {
    background-color: var(--orange-bg);
    color: var(--orange-main);
    opacity: 1;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    padding: 4rem 2rem;
    background-color: var(--orange-bg);
    border-radius: 8px;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--orange-main);
    margin-bottom: 2rem;
    text-align: center;
}

.hero .content {
    max-width: 800px;
    margin: 0 auto;
}

.hero .content p {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.hero .content ul {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.hero .content li {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.hero .content li strong {
    color: var(--orange-main);
}

.article-page {
    max-width: 900px;
    margin: 0 auto;
}

.article-page h1 {
    font-size: 2.5rem;
    color: var(--orange-main);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--orange-main);
}

.article-page h2 {
    font-size: 1.8rem;
    color: var(--orange-main);
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.article-page h3 {
    font-size: 1.4rem;
    color: var(--orange-main);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article-page p {
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.article-page ul, .article-page ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.article-page li {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
    line-height: 1.8;
}

.article-page code {
    background-color: var(--orange-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    color: var(--orange-dark);
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--orange-main);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.back-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.article-card {
    background-color: var(--white);
    border: 2px solid var(--orange-main);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(255, 102, 0, 0.2);
}

.article-card h3 {
    color: var(--orange-main);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.article-card p {
    color: var(--text-light);
    line-height: 1.8;
}

footer {
    background-color: var(--orange-main);
    color: var(--white);
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
        justify-content: center;
    }

    .dropdown-menu {
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
    }

    .dropdown:hover .dropdown-menu {
        transform: translateX(-50%) translateY(0);
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero .content p,
    .hero .content li {
        font-size: 1rem;
    }

    .article-grid {
        grid-template-columns: 1fr;
    }

    main {
        padding: 1rem;
    }

    .article-page h1 {
        font-size: 2rem;
    }

    .article-page h2 {
        font-size: 1.5rem;
    }

    .article-page h3 {
        font-size: 1.2rem;
    }
}