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

:root {
    --primary-color: #0066cc;
    --secondary-color: #00a651;
    --accent-color: #ff6b35;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: var(--transition);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--bg-white);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
}

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

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

.nav-menu a {
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 0;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 3px 0;
    transition: var(--transition);
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

.btn-primary:hover {
    background-color: #0052a3;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    padding-top: 120px;
    padding-bottom: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    color: white;
    margin-bottom: 1rem;
}

.highlight {
    color: #ffd700;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.375rem);
    color: rgba(255, 255, 255, 0.95);
    max-width: 800px;
    margin: 0 auto;
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: 60px 0;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.alt-bg {
    background-color: var(--bg-light);
}

/* ===================================
   Featured Section
   =================================== */
.featured-section {
    background-color: var(--bg-white);
    padding: 80px 0;
}

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

.featured-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.featured-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.featured-image {
    height: 200px;
    background-size: cover;
    background-position: center;
}

.featured-main .featured-image {
    height: 250px;
}

.featured-content {
    padding: 2rem;
}

.featured-content h3 {
    margin-bottom: 0.75rem;
    font-size: 1.375rem;
}

.featured-content h3 a {
    color: var(--text-dark);
    text-decoration: none;
}

.featured-content h3 a:hover {
    color: var(--primary-color);
}

.featured-content p {
    font-size: 1rem;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

/* ===================================
   Category Tags
   =================================== */
.category {
    display: inline-block;
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
}

.category.marketing {
    background-color: #e3f2fd;
    color: #1565c0;
}

.category.seo {
    background-color: #f3e5f5;
    color: #6a1b9a;
}

.category.business {
    background-color: #fff3e0;
    color: #e65100;
}

.category.technology {
    background-color: #e0f2f1;
    color: #00695c;
}

/* ===================================
   Post Meta
   =================================== */
.post-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.post-meta .date,
.post-meta .read-time {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.post-meta .date::before {
    content: "📅";
}

.post-meta .read-time::before {
    content: "⏱";
}

/* ===================================
   Posts Section
   =================================== */
.posts-section {
    padding: 80px 0;
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.post-card {
    background-color: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.post-image {
    height: 200px;
    background-size: cover;
    background-position: center;
}

.post-content {
    padding: 1.75rem;
}

.post-content h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.post-content h3 a {
    color: var(--text-dark);
}

.post-content h3 a:hover {
    color: var(--primary-color);
}

.post-content p {
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

/* ===================================
   Newsletter Section
   =================================== */
.newsletter-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.newsletter-content h2 {
    color: white;
    margin-bottom: 1rem;
}

.newsletter-content p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.newsletter-form {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto;
    flex-wrap: wrap;
    justify-content: center;
}

.newsletter-form input {
    flex: 1;
    min-width: 250px;
    padding: 1rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
}

.newsletter-form button {
    padding: 1rem 2rem;
}

/* ===================================
   About SEO Section
   =================================== */
.about-seo {
    background-color: var(--bg-light);
    padding: 80px 0;
}

.about-seo h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-content p {
    font-size: 1.0625rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    text-align: justify;
}

/* ===================================
   Article Page Styles
   =================================== */
.article-header {
    padding-top: 120px;
    padding-bottom: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.article-header h1 {
    color: white;
    max-width: 900px;
    margin: 0 auto 1.5rem;
}

.article-meta {
    display: flex;
    gap: 2rem;
    justify-content: center;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

.article-content {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 20px;
}

.article-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.article-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.article-content p {
    margin-bottom: 1.5rem;
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.5rem;
    margin-left: 2rem;
}

.article-content li {
    margin-bottom: 0.75rem;
    line-height: 1.7;
    color: var(--text-dark);
}

.article-content strong {
    color: var(--text-dark);
    font-weight: 600;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-light);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--text-dark);
    color: white;
    padding: 60px 0 30px;
}

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

.footer-section h3,
.footer-section h4 {
    color: white;
    margin-bottom: 1.5rem;
}

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

.footer-section a:hover {
    color: var(--accent-color);
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.flag {
    font-size: 2rem;
    margin-top: 1rem;
}

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

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero {
        padding-top: 100px;
        padding-bottom: 50px;
    }

    section {
        padding: 50px 0;
    }

    .featured-grid,
    .posts-grid {
        grid-template-columns: 1fr;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .newsletter-form input {
        width: 100%;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .featured-content,
    .post-content {
        padding: 1.5rem;
    }
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.8s ease-out;
}

/* ===================================
   Accessibility
   =================================== */
:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}