/* ===================================
   MODERN BLOG CSS STYLES
=================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary-color: #4F46E5;
    --primary-dark: #3730A3;
    --primary-light: #6366F1;
    --secondary-color: #06B6D4;
    --accent-color: #F59E0B;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    
    /* Neutrals - Light Theme */
    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    
    /* Dynamic Theme Colors */
    --bg-primary: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-700);
    --text-tertiary: var(--gray-500);
    --border-color: var(--gray-200);
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-heavy: rgba(0, 0, 0, 0.2);
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-secondary: 'Space Grotesk', system-ui, -apple-system, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-medium: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-Index */
    --z-header: 1000;
    --z-modal: 2000;
    --z-toast: 3000;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: var(--gray-900);
    --bg-secondary: var(--gray-800);
    --bg-tertiary: var(--gray-700);
    --text-primary: var(--white);
    --text-secondary: var(--gray-200);
    --text-tertiary: var(--gray-400);
    --border-color: var(--gray-700);
    --shadow-light: rgba(255, 255, 255, 0.05);
    --shadow-medium: rgba(255, 255, 255, 0.1);
    --shadow-heavy: rgba(255, 255, 255, 0.2);
}

/* ===================================
   RESET & BASE STYLES
=================================== */

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-medium), color var(--transition-medium);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-fast);
}

button {
    border: none;
    background: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

/* ===================================
   UTILITY CLASSES
=================================== */

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-medium);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px var(--shadow-medium);
}

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

.btn-secondary:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

/* ===================================
   THEME TOGGLE
=================================== */

.theme-toggle {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 3.5rem;
    height: 3.5rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: all var(--transition-medium);
    box-shadow: 0 4px 20px rgba(79, 70, 229, 0.3);
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: var(--primary-color);
    color: var(--white);
    box-shadow: 0 6px 25px rgba(79, 70, 229, 0.4);
}

.theme-toggle:hover i {
    color: var(--white);
}

.theme-toggle i {
    font-size: 1.3rem;
    transition: all var(--transition-medium);
    color: var(--primary-color);
    position: absolute;
}

.theme-toggle .fa-sun {
    opacity: 0;
    transform: rotate(180deg);
}

.theme-toggle .fa-moon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="dark"] .theme-toggle .fa-moon {
    opacity: 0;
    transform: rotate(180deg);
}

[data-theme="dark"] .theme-toggle .fa-sun {
    opacity: 1;
    transform: rotate(0deg);
}

/* ===================================
   PROGRESS BAR
=================================== */

.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    z-index: var(--z-header);
    transition: width var(--transition-fast);
}

/* ===================================
   BACK TO TOP
=================================== */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 3rem;
    height: 3rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-medium);
    z-index: var(--z-header);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px var(--shadow-medium);
}

/* ===================================
   HEADER
=================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--border-color);
    z-index: var(--z-header);
    transition: all var(--transition-medium);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .header {
    background: rgba(15, 23, 42, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(79, 70, 229, 0.05) 25%, 
        rgba(6, 182, 212, 0.05) 75%, 
        transparent 100%);
    pointer-events: none;
    border-radius: 8px;
}

.nav-brand .brand-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.2rem;
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.1));
    border: 2px solid transparent;
    background-clip: padding-box;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.nav-brand .brand-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.nav-brand .brand-link:hover::before {
    left: 100%;
}

.nav-brand .brand-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.3);
    border-color: var(--primary-color);
}

.nav-brand .brand-name {
    font-family: var(--font-secondary);
    font-weight: 800;
    font-size: 1.2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-brand .brand-subtitle {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .nav-links {
    background: rgba(15, 23, 42, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
}

.nav-link {
    font-weight: 600;
    color: var(--text-secondary);
    position: relative;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all var(--transition-medium);
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
    transform: translateY(-1px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: all var(--transition-medium);
    transform: translateX(-50%);
    border-radius: 1px;
}

.nav-link:hover::after {
    width: 80%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    width: 30px;
    height: 30px;
    justify-content: center;
    align-items: center;
    padding: 5px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-medium);
}

.mobile-menu-toggle:hover {
    background: var(--bg-tertiary);
}

.mobile-menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-medium);
    border-radius: 1px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ===================================
   HERO SECTION
=================================== */

.hero {
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(79, 70, 229, 0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero-title {
    font-family: var(--font-secondary);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    min-height: 4.2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.typing-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-height: 1.2em;
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

.fun-facts {
    background: var(--bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.fun-facts h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-secondary);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-container {
    position: relative;
    width: 300px;
    height: 300px;
}

.data-visualization {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-primary) 100%);
    border-radius: 50%;
    border: 4px solid var(--white);
    box-shadow: 0 20px 40px var(--shadow-medium);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.chart-container {
    position: relative;
    width: 80%;
    height: 80%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 60px;
}

.bar {
    width: 8px;
    background: linear-gradient(to top, var(--primary-color), var(--secondary-color));
    border-radius: 4px 4px 0 0;
    animation: grow 2s ease-out infinite alternate;
}

.bar:nth-child(2n) {
    animation-delay: 0.3s;
}

.bar:nth-child(3n) {
    animation-delay: 0.6s;
}

.chart-lines {
    width: 100%;
    height: 40px;
}

.line-chart {
    width: 100%;
    height: 100%;
}

.floating-icons {
    position: absolute;
    width: 100%;
    height: 100%;
}

.floating-icons i {
    position: absolute;
    font-size: 1.2rem;
    color: var(--primary-color);
    animation: float 3s ease-in-out infinite;
}

.icon-1 {
    top: 20%;
    left: 15%;
    animation-delay: 0s;
}

.icon-2 {
    top: 15%;
    right: 20%;
    animation-delay: 0.7s;
}

.icon-3 {
    bottom: 25%;
    left: 20%;
    animation-delay: 1.4s;
}

.icon-4 {
    bottom: 20%;
    right: 15%;
    animation-delay: 2.1s;
}

@keyframes grow {
    0% { transform: scaleY(0.7); }
    100% { transform: scaleY(1); }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.7;
    }
    50% {
        transform: translateY(-10px) rotate(5deg);
        opacity: 1;
    }
}

.image-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 320px;
}

.pulse-ring {
    width: 100%;
    height: 100%;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: pulse 2s infinite;
    opacity: 0.6;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.3;
    }
    100% {
        transform: scale(1);
        opacity: 0.6;
    }
}

/* ===================================
   ARTICLES SECTION
=================================== */

.articles-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-family: var(--font-secondary);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   SEARCH FEATURE
=================================== */

.search-container {
    max-width: 600px;
    margin: 0 auto var(--spacing-xl) auto;
    padding: 0 var(--spacing-md);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: all var(--transition-medium);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.search-box:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 4px 25px rgba(79, 70, 229, 0.2);
    transform: translateY(-2px);
}

.search-icon {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-right: var(--spacing-md);
    transition: color var(--transition-medium);
}

.search-box:focus-within .search-icon {
    color: var(--primary-color);
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    padding: 0;
}

.search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.search-clear {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: 50%;
    transition: all var(--transition-medium);
    margin-left: var(--spacing-sm);
}

.search-clear:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: scale(1.1);
}

.search-results-count {
    text-align: center;
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

.filter-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
}

.filter-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all var(--transition-medium);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-3xl);
    padding: 0 var(--spacing-md);
}

.article-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 4px 20px var(--shadow-light);
    transition: all var(--transition-medium);
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px var(--shadow-medium);
}

.article-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-image {
    transform: scale(1.05);
}

.article-content {
    padding: var(--spacing-xl);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

.article-tag {
    background: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

.article-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    line-height: 1.3;
}

.article-excerpt {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.article-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.read-more {
    color: var(--primary-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.read-more:hover {
    gap: var(--spacing-md);
}

.reading-time {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

.load-more-section {
    text-align: center;
}

/* ===================================
   ABOUT SECTION
=================================== */

.about-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.about-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.skill-tag {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.skill-tag:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

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

.social-link {
    width: 3rem;
    height: 3rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-medium);
    border: 1px solid var(--border-color);
}

.social-link:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
}

.quote-widget {
    background: var(--bg-tertiary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    position: relative;
}

.quote-content {
    text-align: center;
}

.quote-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.quote-text {
    font-style: italic;
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.quote-refresh {
    background: var(--primary-color);
    color: var(--white);
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    transition: all var(--transition-medium);
}

.quote-refresh:hover {
    transform: rotate(180deg);
}

/* ===================================
   CONTACT SECTION
=================================== */

.contact-section {
    padding: var(--spacing-3xl) 0;
    background: var(--bg-primary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
}

.contact-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.contact-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-medium);
}

.contact-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.1);
    border-color: var(--primary-color);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    min-width: 2rem;
}

.contact-item h4 {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.contact-item p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.contact-form-container {
    background: var(--bg-tertiary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.contact-form .form-group {
    margin-bottom: var(--spacing-lg);
}

.contact-form .form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.contact-form .form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-medium);
    box-sizing: border-box;
}

.contact-form .form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.contact-form .form-textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

.contact-form .contact-submit {
    width: 100%;
    justify-content: center;
    font-size: 1.1rem;
    padding: var(--spacing-md) var(--spacing-xl);
}

.form-status {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-status.success {
    background: rgba(34, 197, 94, 0.1);
    color: #059669;
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.form-status.error {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ===================================
   NEWSLETTER SECTION
=================================== */

.newsletter-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
}

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

.newsletter-title {
    font-family: var(--font-secondary);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.newsletter-subtitle {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.9;
}

.newsletter-form {
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    gap: var(--spacing-md);
    max-width: 400px;
    margin: 0 auto;
}

.form-input {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--white);
    color: var(--text-primary);
}

.form-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.newsletter-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ===================================
   FOOTER
=================================== */

.footer {
    background: var(--bg-tertiary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-title {
    font-family: var(--font-secondary);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.footer-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

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

.footer-social-link {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-medium);
    border: 1px solid var(--border-color);
}

.footer-social-link:hover {
    background: var(--primary-color);
    color: var(--white);
}

.footer-section-title {
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-link {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-contact p {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

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

/* ===================================
   ARTICLE PAGE STYLES
=================================== */

.article-header {
    padding: 6rem var(--spacing-lg) 2rem;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    text-align: center;
}

.article-header-title {
    font-family: var(--font-secondary);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.2;
}

.article-header-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.article-body h2 {
    font-size: 2rem;
    font-weight: 600;
    margin: var(--spacing-2xl) 0 var(--spacing-lg);
    color: var(--text-primary);
}

.article-body h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: var(--spacing-xl) 0 var(--spacing-md);
    color: var(--text-primary);
}

.article-body p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    color: var(--text-secondary);
}

.article-body code {
    background: var(--bg-tertiary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    color: var(--primary-color);
}

.article-body pre {
    background: var(--bg-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
    border: 1px solid var(--border-color);
}

.article-body blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    font-style: italic;
    color: var(--text-secondary);
}

/* ===================================
   RESPONSIVE DESIGN
=================================== */

/* Large tablets and small desktops */
@media (max-width: 1200px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .hero-content {
        gap: var(--spacing-2xl);
    }
    
    .articles-grid {
        grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    }
}

/* Tablets */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-2xl);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .filter-tabs {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }
    
    .filter-tabs::-webkit-scrollbar {
        height: 4px;
    }
    
    .filter-tabs::-webkit-scrollbar-track {
        background: var(--bg-tertiary);
    }
    
    .filter-tabs::-webkit-scrollbar-thumb {
        background: var(--primary-color);
        border-radius: 2px;
    }
}

/* Mobile landscape and small tablets */
@media (max-width: 768px) {
    .nav-brand .brand-name {
        font-size: 1.1rem;
    }
    
    .nav-brand .brand-subtitle {
        font-size: 1rem;
    }
    
    .nav-brand .brand-link {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--bg-primary);
        border-right: 1px solid var(--border-color);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding: var(--spacing-2xl) 0;
        transition: left var(--transition-medium);
        z-index: 999;
        border-radius: 0;
        backdrop-filter: blur(20px);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-link {
        padding: var(--spacing-lg);
        font-size: 1.1rem;
        width: 100%;
        text-align: center;
        border-bottom: 1px solid var(--border-color);
        margin: var(--spacing-sm) 0;
        border-radius: var(--radius-lg);
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .about-title {
        font-size: 2rem;
    }
    
    .skills-tags {
        justify-content: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .hero {
        padding: 5rem 0 3rem;
        min-height: auto;
    }
    
    .hero-content {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .btn {
        width: 100%;
        max-width: 250px;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .fun-facts {
        padding: var(--spacing-lg);
    }
    
    .filter-tabs {
        gap: var(--spacing-sm);
        flex-wrap: nowrap;
    }
    
    .filter-btn {
        white-space: nowrap;
        min-width: auto;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.9rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .article-card {
        margin: 0 auto;
        max-width: 100%;
    }
    
    .form-group {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .form-input {
        width: 100%;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .contact-form .form-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .contact-form-container {
        padding: var(--spacing-lg);
    }
    
    .search-container {
        padding: 0 var(--spacing-sm);
    }
    
    .search-box {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    
    .theme-toggle,
    .back-to-top {
        width: 3rem;
        height: 3rem;
    }
    
    .theme-toggle {
        top: var(--spacing-lg);
        right: var(--spacing-lg);
        border: 2px solid var(--primary-color);
        background: var(--bg-primary);
        box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
    }
    
    .image-container {
        width: 280px;
        height: 280px;
    }
    
    .image-overlay {
        width: 300px;
        height: 300px;
    }
}

/* Mobile portrait */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-brand .brand-name {
        font-size: 1rem;
    }
    
    .nav-brand .brand-subtitle {
        font-size: 0.9rem;
    }
    
    .nav-brand .brand-link {
        font-size: 0.9rem;
        padding: var(--spacing-xs);
    }
    
    .hero-title {
        font-size: 2rem;
        line-height: 1.1;
        min-height: 2.4rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        line-height: 1.5;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .about-title {
        font-size: 1.8rem;
    }
    
    .about-description {
        font-size: 1rem;
    }
    
    .skill-tag {
        font-size: 0.8rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .social-link {
        width: 3rem;
        height: 3rem;
        font-size: 1.1rem;
    }
    
    .image-container {
        width: 220px;
        height: 220px;
    }

    .chart-bars {
        height: 40px;
    }

    .bar {
        width: 6px;
    }

    .floating-icons i {
        font-size: 1rem;
    }
    
    .image-overlay {
        width: 240px;
        height: 240px;
    }
    
    .fun-facts h3 {
        font-size: 1rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .stat-label {
        font-size: 0.8rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .footer-social,
    .social-links {
        justify-content: center;
    }
    
    .skills-tags {
        justify-content: center;
    }
    
    .about-title {
        font-size: 2rem;
    }
    
    .newsletter-title {
        font-size: 2rem;
    }
    
    .newsletter-subtitle {
        font-size: 1rem;
    }
    
    .theme-toggle {
        top: var(--spacing-md);
        right: var(--spacing-md);
        width: 2.8rem;
        height: 2.8rem;
        border: 2px solid var(--primary-color);
        background: var(--bg-primary);
        box-shadow: 0 3px 12px rgba(79, 70, 229, 0.4);
    }
    
    .back-to-top {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 2rem;
        height: 2rem;
    }
}

/* Very small screens */
@media (max-width: 360px) {
    .hero-title {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .filter-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.8rem;
    }
    
    .article-title {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.9rem;
    }
}

/* ===================================
   ANIMATION CLASSES
=================================== */

.fade-in {
    opacity: 0;
    animation: fadeIn 0.6s ease-out forwards;
}

.slide-up {
    transform: translateY(30px);
    opacity: 0;
    animation: slideUp 0.6s ease-out forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

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

/* ===================================
   LOADING STATES
=================================== */

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===================================
   FOCUS STYLES
=================================== */

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

.btn:focus,
.theme-toggle:focus,
.back-to-top:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.3);
}

/* ===================================
   PRINT STYLES
=================================== */

@media print {
    .header,
    .theme-toggle,
    .back-to-top,
    .progress-bar,
    .newsletter-section,
    .footer {
        display: none;
    }
    
    .article-body {
        max-width: none;
        padding: 0;
    }
}