/* ==================== */
/* CSS Variables & Reset */
/* ==================== */
:root {
    /* Colors - Blue Theme */
    --primary-gradient: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
    --secondary-gradient: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    --accent-gradient: linear-gradient(135deg, #22d3ee 0%, #06b6d4 100%);
    --dark-bg: #0c1222;
    --card-bg: #131c31;
    --card-hover: #1a2540;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);

    /* Accent colors */
    --accent-blue: #0ea5e9;
    --accent-cyan: #22d3ee;
    --accent-light: #7dd3fc;

    /* 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: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ==================== */
/* Header */
/* ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(12, 18, 34, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 0;
}

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

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

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

/* ==================== */
/* Hero Section */
/* ==================== */
.hero {
    position: relative;
    padding: 8rem var(--spacing-md) 4rem;
    text-align: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, rgba(14, 165, 233, 0.15) 0%, transparent 50%);
    animation: rotate 20s linear infinite;
    pointer-events: none;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    min-width: 120px;
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-glow);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* ==================== */
/* Blog Section */
/* ==================== */
.blog-section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.filter-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tag:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.tag.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.blog-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
}

.blog-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

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

.blog-card:hover::before {
    transform: scaleX(1);
}

.blog-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.3) 0%, rgba(6, 182, 212, 0.3) 100%);
}

.blog-card-content {
    padding: var(--spacing-md);
}

.blog-card-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.blog-card-tag {
    padding: 0.25rem 0.75rem;
    background: rgba(14, 165, 233, 0.2);
    color: #7dd3fc;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.blog-card-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.blog-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.blog-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.blog-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #7dd3fc;
    font-weight: 600;
    text-decoration: none;
    transition: gap 0.3s ease;
}

.blog-card-link:hover {
    gap: 0.75rem;
}

.blog-card-link::after {
    content: '→';
    font-size: 1.25rem;
}

/* ==================== */
/* About Section */
/* ==================== */
.about-section {
    padding: var(--spacing-2xl) 0;
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.about-text {
    margin-bottom: var(--spacing-xl);
}

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

.tech-stack {
    margin-top: var(--spacing-xl);
}

.tech-stack h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.tech-icons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tech-badge {
    padding: 0.75rem 1.5rem;
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.3);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
}

.tech-badge:hover {
    background: rgba(14, 165, 233, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}

/* ==================== */
/* Footer */
/* ==================== */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: #7dd3fc;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

.social-link {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.social-link:hover {
    background: var(--primary-gradient);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* ==================== */
/* Responsive Design */
/* ==================== */
@media (max-width: 768px) {
    .nav {
        gap: var(--spacing-md);
    }

    .hero {
        padding: 6rem var(--spacing-md) 3rem;
    }

    .hero-stats {
        gap: var(--spacing-md);
    }

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

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

    .social-links {
        justify-content: center;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.blog-card {
    animation: fadeInUp 0.6s ease forwards;
}

.blog-card:nth-child(1) {
    animation-delay: 0.1s;
}

.blog-card:nth-child(2) {
    animation-delay: 0.2s;
}

.blog-card:nth-child(3) {
    animation-delay: 0.3s;
}

.blog-card:nth-child(4) {
    animation-delay: 0.4s;
}

.blog-card:nth-child(5) {
    animation-delay: 0.5s;
}

.blog-card:nth-child(6) {
    animation-delay: 0.6s;
}