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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f9fafb;
    --white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
}

/* Header */
.site-header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo span {
    color: var(--accent-color);
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.main-nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 20px;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 20px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 3rem;
}

/* Articles */
.articles-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.article-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.article-image {
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 3rem;
}

.article-content {
    padding: 2rem;
}

.article-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.article-category {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    text-decoration: none;
}

.article-card h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.article-card h2 a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s;
}

.article-card h2 a:hover {
    color: var(--primary-color);
}

.article-excerpt {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.read-more {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.3s;
}

.read-more:hover {
    color: var(--secondary-color);
}

/* Sidebar */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.sidebar-widget {
    background: var(--white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.widget-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.category-list {
    list-style: none;
}

.category-list li {
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
}

.category-list li:last-child {
    border-bottom: none;
}

.category-list a {
    color: var(--text-color);
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color 0.3s;
}

.category-list a:hover {
    color: var(--primary-color);
}

.category-count {
    background: var(--bg-color);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.875rem;
    color: var(--text-light);
}

/* Ad Container */
.ad-container {
    background: var(--white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
    min-height: 280px;
}

.ad-label {
    font-size: 0.75rem;
    color: var(--text-light);
    text-transform: uppercase;
    margin-bottom: 1rem;
    letter-spacing: 1px;
}

/* Footer */
.site-footer {
    background: var(--text-color);
    color: var(--white);
    padding: 3rem 20px;
    margin-top: 5rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* Article Page */
.article-full {
    background: var(--white);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: var(--shadow);
}

.article-full h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.article-full-content {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-color);
}

.article-full-content h2 {
    font-size: 1.75rem;
    margin: 2rem 0 1rem;
    color: var(--text-color);
}

.article-full-content h3 {
    font-size: 1.375rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-color);
}

.article-full-content p {
    margin-bottom: 1.5rem;
}

.article-full-content ul,
.article-full-content ol {
    margin: 1rem 0 1.5rem 2rem;
}

.article-full-content li {
    margin-bottom: 0.5rem;
}

.article-full-content code {
    background: var(--bg-color);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    font-family: "Courier New", monospace;
}

.article-full-content pre {
    background: var(--text-color);
    color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1.5rem 0;
}

.article-full-content pre code {
    background: none;
    padding: 0;
    color: var(--white);
}

/* Contact Form */
.contact-form {
    max-width: 600px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
    }

    .article-full {
        padding: 1.5rem;
    }

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