/* ===== CSS RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --accent-color: #3b82f6;
    --background: #ffffff;
    --surface: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

/* ===== HERO SECTION ===== */
.hero {
    padding: calc(80px + var(--spacing-2xl)) 0 var(--spacing-2xl);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

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

/* ===== SECTIONS ===== */
section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

/* ===== ABOUT SECTION ===== */
.about {
    background-color: var(--surface);
}

.about .container {
    max-width: 95%;
}

.about-content {
    max-width: 100%;
    margin: 0 auto;
    text-align: center;
}

.about-intro {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl) auto;
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

/* ===== BLOG SECTION ===== */
/* Blog Header */
.blog-header {
    text-align: center;
    margin-bottom: 4rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 2.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 1rem 0;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.7;
    font-weight: 400;
}

/* Blog Category Section */
.blog-category {
    margin-bottom: 4rem;
}

/* Category Header Wrapper */
.category-header-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.category-title-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-icon {
    font-size: 1.75rem;
    line-height: 1;
}

.category-name {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    letter-spacing: -0.01em;
}

.category-count {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: var(--surface);
    padding: 0.375rem 0.875rem;
    border-radius: 2rem;
    letter-spacing: 0.02em;
}

/* Posts List */
.posts-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* Post Item */
.post-item {
    position: relative;
    background-color: white;
    border-radius: 0.75rem;
    padding: 2rem 2rem 2rem 2.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.post-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.06);
    border-color: var(--primary-color);
}

/* Post Indicator */
.post-indicator {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.post-item:hover .post-indicator {
    width: 6px;
}

/* Post Content */
.post-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Post Header */
.post-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.25rem;
}

.post-title {
    font-size: 1.375rem;
    font-weight: 700;
    margin: 0;
    line-height: 1.4;
    letter-spacing: -0.01em;
    flex: 1;
}

.post-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.2s ease;
    display: inline;
    background-image: linear-gradient(transparent calc(100% - 2px), var(--primary-color) 2px);
    background-repeat: no-repeat;
    background-size: 0% 100%;
    transition: background-size 0.3s ease, color 0.3s ease;
}

.post-title a:hover {
    color: var(--primary-color);
    background-size: 100% 100%;
}

/* Post Badge */
.post-badge {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.375rem 0.75rem;
    border-radius: 0.375rem;
    white-space: nowrap;
    flex-shrink: 0;
}

.post-badge:contains("Featured") {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* Since CSS doesn't support :contains, we'll use a general style */
.post-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

/* Post Summary */
.post-summary {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
    margin: 0;
}

/* Post Meta */
.post-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.meta-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.post-date,
.reading-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
}

.post-date svg,
.reading-time svg {
    flex-shrink: 0;
    opacity: 0.7;
}

/* Read More Link */
.read-more-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    white-space: nowrap;
}

.read-more-link svg {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.read-more-link:hover {
    color: var(--primary-dark);
}

.read-more-link:hover svg {
    transform: translateX(4px);
}

/* View All Posts */
.view-all-posts {
    text-align: center;
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 2px solid var(--border-color);
}

.view-all-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    border-radius: 0.75rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    letter-spacing: 0.01em;
}

.view-all-btn svg {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.view-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
}

.view-all-btn:hover svg {
    transform: translateX(4px);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .category-header-wrapper {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .category-name {
        font-size: 1.5rem;
    }
    
    .post-item {
        padding: 1.5rem 1.5rem 1.5rem 2rem;
    }
    
    .post-header {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .post-title {
        font-size: 1.25rem;
    }
    
    .post-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .meta-left {
        gap: 1rem;
    }
    
    .view-all-btn {
        padding: 0.875rem 2rem;
        font-size: 1rem;
    }
}

/* ===== CONTACT SECTION ===== */
.contact {
    background-color: var(--surface);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.social-link {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
}

.social-link:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--text-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.footer p {
    opacity: 0.8;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        right: -100%;
        flex-direction: column;
        background-color: white;
        width: 100%;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: right 0.3s ease;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hero {
        min-height: 60vh;
    }

    .category-header {
        font-size: 1.5rem;
    }

    .category-icon {
        font-size: 1.25rem;
    }

    .post-item {
        padding: var(--spacing-md);
    }

    .post-title {
        font-size: 1.25rem;
    }

    .post-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }

    .category-header {
        font-size: 1.25rem;
    }

    .post-title {
        font-size: 1.125rem;
    }

    .post-summary {
        font-size: 0.9375rem;
    }

    .post-item:hover {
        transform: translateX(4px);
    }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-content,
.about-content {
    animation: fadeIn 0.6s ease-out;
}

.post-item {
    animation: slideInLeft 0.5s ease-out;
}

.blog-category:nth-child(1) .post-item { animation-delay: 0.1s; }
.blog-category:nth-child(2) .post-item { animation-delay: 0.15s; }
.blog-category:nth-child(3) .post-item { animation-delay: 0.2s; }
.blog-category:nth-child(4) .post-item { animation-delay: 0.25s; }
.blog-category:nth-child(5) .post-item { animation-delay: 0.3s; }
.blog-category:nth-child(6) .post-item { animation-delay: 0.35s; }
.blog-category:nth-child(7) .post-item { animation-delay: 0.4s; }
/* ===== EXPERTISE GRID (About Section) ===== */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

@media (max-width: 992px) {
    .expertise-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .expertise-grid {
        grid-template-columns: 1fr;
    }
}

.expertise-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: left;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.expertise-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.expertise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-color);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.expertise-card:hover::before {
    opacity: 1;
}

.expertise-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    display: inline-block;
}

.expertise-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.expertise-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0; /* Override previous p margin */
}