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

:root {
    --primary: #dc2626;
    --primary-dark: #991b1b;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-gray: #f3f4f6;
    --border: #e5e7eb;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family:
        "Inter",
        -apple-system,
        BlinkMacSystemFont,
        sans-serif;
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.6;
}

/* Header */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-dark);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 18px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.nav-menu a {
    color: var(--text-gray);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s;
}

.nav-menu a:hover {
    color: var(--text-dark);
}

.nav-menu .active {
    color: var(--primary);
}

.search-button {
    padding: 8px 16px;
    background: var(--bg-gray);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.search-button:hover {
    background: var(--bg-light);
    border-color: var(--text-gray);
}

/* Hero Section */
.hero {
    background: linear-gradient(
        180deg,
        var(--bg-gray) 0%,
        var(--bg-white) 100%
    );
    padding: 80px 24px;
}

.hero-content {
    max-width: 1280px;
    margin: 0 auto;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    font-size: 15px;
    transition: all 0.2s;
    display: inline-block;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-dark);
    border-color: var(--border);
}

.btn-secondary:hover {
    background: var(--bg-gray);
}

/* Main Content */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 60px 24px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 48px;
}

/* Article List */
.section-header {
    margin-bottom: 40px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.filter-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 8px 16px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-tab:hover {
    background: var(--bg-gray);
}

.filter-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Article Cards */
.articles-grid {
    display: grid;
    gap: 32px;
}

.article-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.article-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-image i {
    font-size: 48px;
    color: white;
    opacity: 0.9;
}

.article-content {
    padding: 24px;
}

.article-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--text-gray);
}

.article-category {
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
}

.article-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.3;
    color: var(--text-dark);
}

.article-excerpt {
    color: var(--text-gray);
    margin-bottom: 16px;
    line-height: 1.6;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.article-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-gray);
    font-size: 14px;
    font-weight: 600;
}

.author-name {
    font-size: 14px;
    color: var(--text-gray);
}

.read-more {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 88px;
    height: fit-content;
}

.widget {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.widget-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.search-box {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 10px 40px 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--bg-white);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
}

.search-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-gray);
}

/* Categories */
.category-list {
    list-style: none;
}

.category-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.category-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.category-link {
    color: var(--text-dark);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.2s;
}

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

.category-count {
    background: var(--bg-gray);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    color: var(--text-gray);
}

/* Popular Posts */
.popular-post {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.popular-post:last-child {
    margin-bottom: 0;
}

.popular-number {
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.popular-content h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.4;
}

.popular-content span {
    font-size: 12px;
    color: var(--text-gray);
}

/* Newsletter */
.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.newsletter-input {
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
}

.newsletter-button {
    padding: 10px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
}

.newsletter-button:hover {
    background: var(--primary-dark);
}

/* Footer */
footer {
    background: var(--text-dark);
    color: white;
    padding: 48px 24px 24px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 48px;
    margin-bottom: 32px;
}

.footer-section h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-section p {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 14px;
}

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

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--text-light);
    font-size: 14px;
}

/* Mobile */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hero h1 {
        font-size: 32px;
    }

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

    .sidebar {
        position: static;
    }
}