:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: 1px solid rgba(255, 255, 255, 0.1);
    --card-hover-border: 1px solid rgba(56, 189, 248, 0.5);
    --glass-effect: blur(10px);
    --nav-height: 70px;
    --container-width: 1200px;
    --nav-bg: rgba(15, 23, 42, 0.8);
    --nav-bg-scrolled: rgba(15, 23, 42, 0.95);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: 1px solid rgba(203, 213, 225, 0.6);
    --card-hover-border: 1px solid rgba(56, 189, 248, 0.8);
    --nav-bg: rgba(255, 255, 255, 0.8);
    --nav-bg-scrolled: rgba(255, 255, 255, 0.95);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(129, 140, 248, 0.1) 0%, transparent 20%);
    background-attachment: fixed;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header / Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--nav-height);
    background: var(--nav-bg);
    backdrop-filter: var(--glass-effect);
    border-bottom: var(--card-border);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
    background: var(--nav-bg-scrolled);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
}

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

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px; /* Control gap between theme toggle and mobile menu btn */
}

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    color: var(--accent-color);
    transform: rotate(15deg);
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    margin-left: 0; /* Reset any previous margin */
}

/* Hero Section */
.hero {
    padding-top: 120px;
    padding-bottom: 40px;
    animation: fadeIn 1s ease-out;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    flex-direction: row-reverse;
}

.hero-text {
    flex: 1;
    text-align: left;
}

.avatar-container {
    width: 280px;
    height: 280px;
    position: relative;
    flex-shrink: 0;
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--bg-secondary);
    box-shadow: 0 0 30px rgba(56, 189, 248, 0.3);
    transition: transform 0.3s ease;
}

.avatar:hover {
    transform: scale(1.05) rotate(5deg);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -1px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    max-width: 600px;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

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

.stat-number {
    display: block;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.social-links {
    display: flex;
    gap: 20px;
}

.social-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border: var(--card-border);
    transition: all 0.3s ease;
}

.social-btn:hover {
    background: var(--accent-color);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(56, 189, 248, 0.2);
}

/* Section Styling */
.section {
    padding: 40px 0;
}

.section-header {
    margin-bottom: 30px;
    text-align: center;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 3px;
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

/* Cards */
.modern-card {
    background: var(--card-bg);
    backdrop-filter: var(--glass-effect);
    border: var(--card-border);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.modern-card:hover {
    transform: translateY(-5px);
    border: var(--card-hover-border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.card-icon {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.card-desc {
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-grow: 1;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.tech-stack {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.tech-badge {
    font-size: 0.75rem;
    padding: 4px 10px;
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    border-radius: 20px;
}

/* About Page Specifics */
.about-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 15px;
    margin-top: 30px;
}

.skill-badge {
    background: var(--bg-secondary);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    border: var(--card-border);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.skill-badge i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.skill-badge:hover {
    background: var(--card-bg);
    border-color: var(--accent-color);
    transform: translateY(-3px);
}

.timeline {
    position: relative;
    padding-left: 30px;
    border-left: 2px solid rgba(255, 255, 255, 0.1);
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
}

.timeline-dot {
    position: absolute;
    left: -36px;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 2px solid var(--bg-primary);
}

.timeline-date {
    font-size: 0.875rem;
    color: var(--accent-color);
    margin-bottom: 5px;
    display: block;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 50px 0;
    margin-top: 80px;
    border-top: var(--card-border);
}

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

.copyright {
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-link {
    color: var(--text-secondary);
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.social-link:hover {
    color: #fff;
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-3px);
}

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

/* Card Header (Icon + Title on same line) */
.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.card-header .card-icon {
    margin-bottom: 0;
}

.card-header .card-title {
    margin-bottom: 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* Should add JS for mobile menu */
    }
    
    .mobile-menu-btn {
        display: block;
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 40px;
    }

    .hero-text {
        text-align: center;
    }

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

    .stat-item {
        text-align: center;
    }
    
    .avatar-container {
        width: 200px;
        height: 200px;
    }

    .hero-title {
        font-size: 2.5rem;
    }
    
    .about-layout {
        grid-template-columns: 1fr;
    }
    
    .modern-card.horizontal-card {
        flex-direction: column;
        text-align: center;
    }

    .horizontal-card .card-icon {
        margin-bottom: 20px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}