/* ============================================
   AJINKYA RATHOD - PERSONAL WEBSITE
   Modern, Responsive CSS with Dark Mode Support
   ============================================ */

/* ============================================
   ROOT VARIABLES & THEME CONFIGURATION
   ============================================ */
:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent-color: #f59e0b;
    --accent-light: #fbbf24;
    
    /* Text Colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #f3f4f6;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-dark: #111827;
    
    /* Border Colors */
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    /* Shadow */
    --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);
    
    /* 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;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Ubuntu Mono', 'Consolas', 'source-code-pro', monospace;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-light: #1f2937;
    
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --bg-dark: #0f172a;
    
    --border-color: #374151;
    --border-light: #1f2937;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

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

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: none;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 1rem;
}

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

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

/* Ensure button text remains visible in all states (visited/focus/active) */
.btn,
.btn:visited,
.btn:hover,
.btn:focus,
.btn:active {
    color: white !important;
    -webkit-text-fill-color: initial !important;
    text-decoration: none !important;
}

/* Prevent accidental text transparency from background-clip or other effects */
.btn {
    -webkit-background-clip: border-box !important;
    background-clip: border-box !important;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

.btn:active {
    transform: translateY(0) !important;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    position: sticky;
    top: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.navbar {
    padding: var(--spacing-lg) 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

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

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

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
}

.hero-avatar {
    flex: 0 0 auto;
}

.avatar-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 0 2px #d1b8a2, var(--shadow-xl);
    animation: fadeInUp 0.8s ease-out;
}

.hero-text {
    flex: 1;
    min-width: 300px;
}

.hero-title {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.hero-tagline {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   SECTIONS
   ============================================ */
section {
    padding: var(--spacing-3xl) 0;
    border-bottom: 1px solid var(--border-color);
}

section:last-of-type {
    border-bottom: none;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-cta {
    text-align: center;
    margin-top: var(--spacing-2xl);
}

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

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

.about-text p {
    margin-bottom: var(--spacing-lg);
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-text strong {
    color: var(--primary-color);
}

.about-links h3 {
    margin-bottom: var(--spacing-lg);
    font-size: 1.25rem;
}

.quick-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.quick-links li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.quick-links li a:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateX(5px);
    border-color: var(--primary-color);
}

.quick-links li a i {
    font-size: 1.25rem;
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */
.experience {
    background-color: var(--bg-primary);
}

.experience-timeline {
    position: relative;
    padding: var(--spacing-2xl) 0;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    left: 40px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

.experience-item {
    display: flex;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.experience-item:last-child {
    margin-bottom: 0;
}

.experience-marker {
    flex: 0 0 auto;
    width: 80px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: var(--spacing-md);
}

.marker-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    border: 4px solid var(--primary-color);
    position: relative;
    z-index: 1;
}

.marker-dot.current-marker {
    background-color: var(--primary-color);
    box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.1);
}

.experience-content {
    flex: 1;
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.experience-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(5px);
}

.experience-header {
    margin-bottom: var(--spacing-md);
}

.experience-title {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.experience-company {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
}

.experience-period {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.experience-period i {
    margin-right: var(--spacing-sm);
    color: var(--accent-color);
}

.experience-description {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   ARTICLES SECTION
   ============================================ */
.articles {
    background-color: var(--bg-secondary);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.article-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    height: 100%;
}

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

.article-header {
    margin-bottom: var(--spacing-lg);
}

.article-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.article-title a {
    transition: color var(--transition-normal);
}

.article-title a:hover {
    color: var(--primary-dark);
}

.article-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
    line-height: 1.7;
}

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

.article-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.article-link {
    color: var(--primary-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
}

.article-link:hover {
    gap: var(--spacing-md);
}

/* ============================================
   VIDEOS SECTION
   ============================================ */
.videos {
    background-color: var(--bg-primary);
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.video-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

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

.video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    background-color: #000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-info {
    padding: var(--spacing-lg);
}

.video-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.video-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.video-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-color);
    font-weight: 600;
    transition: all var(--transition-normal);
}

.video-link:hover {
    gap: var(--spacing-md);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects {
    background-color: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.project-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

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

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.project-title {
    font-size: 1.25rem;
    margin: 0;
    flex: 1;
}

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

.project-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.project-links a:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    flex-grow: 1;
    line-height: 1.7;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.tag {
    display: inline-block;
    background-color: var(--bg-secondary);
    color: var(--primary-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    border: 1px solid var(--primary-color);
    transition: all var(--transition-normal);
}

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

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact {
    background-color: var(--bg-primary);
    text-align: center;
}

.contact-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 900;
    transition: all var(--transition-normal);
    background-color: var(--primary-color);
    color: white;
    border: 2px solid var(--primary-color);
}

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

.social-icon.linkedin:hover {
    background-color: #0a66c2;
    border-color: #0a66c2;
    color: white;
}

.social-icon.twitter:hover {
    background-color: #000;
    border-color: #000;
    color: white;
}

.social-icon.instagram:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: #764ba2;
    color: white;
}

.social-icon.github:hover {
    background-color: #333;
    border-color: #333;
    color: white;
}

.social-icon.email:hover {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.social-icon.medium:hover {
    background-color: #000;
    border-color: #000;
    color: white;
}

.social-icon.stackoverflow:hover {
    background-color: #f48024;
    border-color: #f48024;
    color: white;
}

.social-icon.youtube:hover {
    background-color: #ff0000;
    border-color: #ff0000;
    color: white;
}

.contact-outro {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-text i {
    color: #ef4444;
}

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

/* Tablets (768px and up) */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .nav-menu {
        gap: var(--spacing-lg);
        font-size: 0.95rem;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-2xl);
    }

    .hero-avatar {
        flex: 0 0 auto;
    }

    .avatar-image {
        width: 150px;
        height: 150px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-tagline {
        font-size: 1.25rem;
    }

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

    .experience-timeline::before {
        left: 30px;
    }

    .experience-marker {
        width: 60px;
    }

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

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

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

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

/* Mobile (480px and below) */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 1rem;
        --spacing-xl: 1.25rem;
        --spacing-2xl: 1.5rem;
        --spacing-3xl: 2rem;
    }

    section {
        padding: var(--spacing-2xl) 0;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    h3 {
        font-size: 1rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .navbar .container {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }

    .nav-menu {
        width: 100%;
        flex-wrap: wrap;
        gap: var(--spacing-md);
        order: 3;
        justify-content: center;
    }

    .hero-content {
        gap: var(--spacing-lg);
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-tagline {
        font-size: 1rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .avatar-image {
        width: 120px;
        height: 120px;
    }

    .about-text p {
        font-size: 0.95rem;
    }

    .quick-links {
        gap: var(--spacing-sm);
    }

    .quick-links li a {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }

    .experience-timeline::before {
        left: 25px;
    }

    .experience-marker {
        width: 50px;
        padding-top: 0;
    }

    .marker-dot {
        width: 16px;
        height: 16px;
        border-width: 3px;
    }

    .experience-item {
        gap: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }

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

    .experience-title {
        font-size: 1rem;
    }

    .experience-company {
        font-size: 0.8rem;
    }

    .article-card,
    .project-card {
        padding: var(--spacing-lg);
    }

    .article-title,
    .project-title {
        font-size: 1.05rem;
    }

    .project-header {
        gap: var(--spacing-md);
    }

    .project-links a {
        width: 32px;
        height: 32px;
    }

    .social-icon {
        width: 45px;
        height: 45px;
        font-size: 1.25rem;
    }

    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 0.9rem;
    }
}

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

/* Hide on mobile */
@media (max-width: 768px) {
    .hide-mobile {
        display: none !important;
    }
}

/* Show only on mobile */
@media (min-width: 769px) {
    .show-mobile {
        display: none !important;
    }
}

/* Animations */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Scroll animations */
.scroll-animate {
    opacity: 0;
    animation: fadeInUp 0.8s ease-out forwards;
}