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

/* Default Dark Theme */
:root {
    --primary-color: #ffffff;
    --secondary-color: #3b82f6;
    --accent-color: #6366f1;
    --text-primary: #ffffff;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #111111;
    --border-color: #1f1f1f;
    --shadow-sm: 0 1px 2px 0 rgba(255, 255, 255, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(255, 255, 255, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(255, 255, 255, 0.15);
    --shadow-xl: 0 20px 25px -5px rgba(255, 255, 255, 0.2);
    --glow-primary: 0 0 15px rgba(255, 255, 255, 0.3);
    --glow-secondary: 0 0 15px rgba(59, 130, 246, 0.5);
    --glow-accent: 0 0 15px rgba(99, 102, 241, 0.5);
}

/* Blue/Cyan Theme */
:root[data-theme="blue"] {
    --primary-color: #00EDF9;
    --secondary-color: #022940;
    --accent-color: #00EDF9;
    --text-primary: #FFFFFF;
    --text-secondary: #D6DADD;
    --text-light: #2E4956;
    --bg-primary: #022940;
    --bg-secondary: #011a2a;
    --bg-card: #032d45;
    --border-color: #2E4956;
    --shadow-sm: 0 1px 2px 0 rgba(0, 237, 249, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 237, 249, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(0, 237, 249, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 237, 249, 0.25);
    --glow-primary: 0 0 15px rgba(0, 237, 249, 0.5);
    --glow-secondary: 0 0 15px rgba(0, 237, 249, 0.3);
    --glow-accent: 0 0 15px rgba(0, 237, 249, 0.4);
}

body {
    font-family: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', 'Consolas', 'Monaco', monospace;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    font-size: 16px;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
}

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

/* ===== SKIP LINK ===== */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 15px 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.theme-toggle:hover {
    border-color: var(--primary-color);
    box-shadow: var(--glow-primary);
    transform: translateY(-3px);
}

.theme-toggle-icon {
    font-size: 1.3rem;
    transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-toggle-icon {
    transform: rotate(180deg);
}

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

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-logo-img {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    object-fit: cover;
}

.nav-logo-text {
    display: flex;
    flex-direction: column;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
    line-height: 1.2;
}

.nav-logo-tagline {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
    font-style: italic;
}

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

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
    padding: 0.5rem 0;
}

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

.dropdown {
    position: relative;
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    border-radius: 8px;
    padding: 0.5rem 0;
    min-width: 220px;
    list-style: none;
    margin-top: 0.5rem;
    border: 1px solid var(--border-color);
}

.dropdown:hover .dropdown-menu {
    display: block;
}

.dropdown-menu li {
    padding: 0;
}

.dropdown-menu a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.dropdown-menu a:hover {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

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

.menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 3px;
}

/* ===== HERO SECTION ===== */
.hero {
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 50%, #000000 100%);
    position: relative;
    overflow: hidden;
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
    color: var(--primary-color);
    text-shadow: var(--glow-primary);
}

.hero-subtitle {
    font-size: 1.75rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    background: linear-gradient(135deg, #ffffff 0%, #3b82f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border: 2px solid var(--primary-color);
    box-shadow: var(--glow-primary);
    font-weight: 700;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--border-color);
    font-weight: 700;
}

.btn-secondary:hover {
    background-color: var(--bg-card);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--glow-primary);
}

/* ===== MAIN CONTENT ===== */
.main-content {
    padding: 4rem 0;
}

/* ===== PROFILE SECTION ===== */
.profile-section {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.profile-image-container {
    position: relative;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    border: 5px solid var(--primary-color);
    box-shadow: var(--glow-primary), var(--shadow-xl);
    transition: all 0.3s ease;
}

.profile-image-container:hover {
    transform: scale(1.05);
    box-shadow: 0 0 40px var(--primary-color), var(--shadow-xl);
    border-width: 6px;
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .profile-image-container {
        width: 250px;
        height: 250px;
    }
}

@media (max-width: 480px) {
    .profile-image-container {
        width: 200px;
        height: 200px;
    }
}

/* ===== INTRODUCTION SECTION ===== */
.intro-section {
    max-width: 900px;
    margin: 0 auto 4rem;
    padding: 0 1rem;
}

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

.intro-greeting {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-shadow: var(--glow-primary);
    animation: fadeInUp 0.6s ease;
}

.intro-text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    text-align: center;
}

.intro-text strong {
    color: var(--primary-color);
    font-weight: 600;
}

.intro-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.intro-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px var(--primary-color);
    transform: translateY(-2px);
}

.intro-subtitle {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.intro-list {
    list-style: none;
    text-align: left;
    max-width: 700px;
    margin: 0 auto;
}

.intro-list li {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-secondary);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.intro-list li:last-child {
    border-bottom: none;
}

.intro-list li:hover {
    color: var(--primary-color);
    transform: translateX(10px);
}

.intro-list strong {
    color: var(--primary-color);
}

.intro-goal {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-card);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .intro-greeting {
        font-size: 2rem;
    }
    
    .intro-text {
        font-size: 1rem;
    }
    
    .intro-card {
        padding: 1.5rem;
    }
    
    .intro-list li {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .intro-greeting {
        font-size: 1.75rem;
    }
    
    .intro-subtitle {
        font-size: 1.5rem;
    }
    
    .intro-card {
        padding: 1rem;
    }
}

/* ===== FILTER SECTION ===== */
.filter-section {
    margin-bottom: 3rem;
}

.filter-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    text-align: center;
}

.filter-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 0.625rem 1.25rem;
    background-color: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    color: var(--text-secondary);
}

.filter-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.filter-btn.active {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-color: var(--primary-color);
    box-shadow: var(--glow-primary);
    font-weight: 700;
}

/* ===== BLOG GRID ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.blog-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
}

.blog-category {
    display: inline-block;
    padding: 0.375rem 1rem;
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 700;
    margin-bottom: 1rem;
    width: fit-content;
    box-shadow: var(--glow-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.blog-excerpt {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    flex-grow: 1;
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-light);
}

.blog-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.blog-link:hover {
    text-shadow: var(--glow-primary);
    text-decoration: underline;
}

/* ===== ABOUT SECTION ===== */
.about-section {
    margin-top: 4rem;
}

.about-content h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    text-align: center;
}

.about-card {
    background-color: var(--bg-card);
    border-radius: 12px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.about-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 40px rgba(255, 255, 255, 0.1);
}

.about-card h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.about-card > p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.features-list,
.projects-list {
    list-style: none;
    margin-left: 1rem;
}

.features-list li,
.projects-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.features-list li:before,
.projects-list li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.expertise-item {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.expertise-item h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.expertise-item ul {
    list-style: none;
}

.expertise-item li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.expertise-item li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.arsenal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.arsenal-item {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.arsenal-item h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background-color: var(--bg-card);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
    font-weight: 500;
    transition: all 0.3s ease;
}

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

/* ===== SOCIAL SECTION ===== */
.social-section {
    text-align: center;
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.social-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.social-btn .icon {
    font-size: 1.5rem;
}

.social-btn.github:hover {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-color: var(--primary-color);
    box-shadow: var(--glow-primary);
}

.social-btn.tryhackme:hover {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
    box-shadow: var(--glow-secondary);
}

.social-btn.leetcode:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: var(--glow-accent);
}

/* ===== QUOTE SECTION ===== */
.quote-section {
    margin: 4rem 0;
    padding: 3rem 2rem;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.quote-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
}

.inspirational-quote {
    text-align: center;
    color: white;
    position: relative;
    z-index: 1;
    padding-left: 2rem;
}

.inspirational-quote p {
    font-size: 1.5rem;
    font-style: italic;
    margin-bottom: 1rem;
    line-height: 1.6;
    color: var(--primary-color);
}

.inspirational-quote cite {
    font-size: 1.1rem;
    font-style: normal;
    color: var(--text-secondary);
}

/* ===== FOOTER ===== */
.footer {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    padding: 3rem 0 2rem;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

.footer-copyright {
    text-align: center;
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .nav-logo-img {
        width: 40px;
        height: 40px;
    }
    
    .nav-logo a {
        font-size: 1.25rem;
    }
    
    .nav-logo-tagline {
        font-size: 0.65rem;
    }
    
    .theme-toggle {
        bottom: 20px;
        right: 20px;
        padding: 12px 20px;
        font-size: 0.85rem;
    }
    
    .theme-toggle-text {
        display: none;
    }
    
    .theme-toggle-icon {
        font-size: 1.5rem;
    }
    .menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        padding: 2rem 0;
        gap: 0;
    }

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

    .nav-item {
        width: 100%;
        padding: 1rem 0;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        margin-top: 0.5rem;
        background-color: var(--bg-secondary);
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .hero-description {
        font-size: 1.1rem;
    }

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

    .expertise-grid,
    .arsenal-grid {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        justify-content: flex-start;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0;
    }

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

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

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        width: 100%;
    }

    .about-card {
        padding: 1.5rem;
    }

    .social-links {
        flex-direction: column;
    }

    .social-btn {
        width: 100%;
        justify-content: center;
    }
}

/* ===== HIDDEN CLASS FOR FILTERING ===== */
.hidden {
    display: none !important;
}