/* Custom Properties and Global Styles (DEFAULT: DARK) */
:root {
    --accent-color: #00bcd4; /* Cyan/Teal for highlights */
}

/* DARK THEME DEFAULTS (Applied to body[data-theme="dark"]) */
body[data-theme="dark"] {
    --bg-color: #121212; 
    --text-color: #e0e0e0; 
    --secondary-color: #1e1e1e;
    --card-shadow: rgba(0, 0, 0, 0.3);
}

/* LIGHT THEME DEFINITION (Applied to body[data-theme="light"]) */
body[data-theme="light"] {
    --bg-color: #f0f0f0; 
    --text-color: #333333; 
    --secondary-color: #ffffff;
    --card-shadow: rgba(0, 0, 0, 0.1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s; /* Smooth transition for theme change */
}

/* Typography */
h1, h2, h3 {
    color: var(--text-color); 
    margin-bottom: 0.5em;
    transition: color 0.3s;
}
body[data-theme="dark"] h1, body[data-theme="dark"] h2 {
    color: white; 
}
body[data-theme="light"] h1, body[data-theme="light"] h2 {
    color: #111; 
}


h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
}

p {
    margin-bottom: 1em;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #00e5ff;
}

/* Layout */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 60px; /* Space for fixed navbar */
}

.content-section {
    padding: 80px 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
    font-weight: 700;
}

/* --- Navigation Bar --- */
#navbar {
    background-color: var(--secondary-color);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    box-shadow: 0 2px 10px var(--card-shadow);
    z-index: 1000;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
}
body[data-theme="dark"] .nav-brand { color: white; }
body[data-theme="light"] .nav-brand { color: #111; }

.nav-brand .dot {
    color: var(--accent-color);
}

.nav-links {
    list-style: none;
    display: flex;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    font-weight: 500;
    text-transform: uppercase;
    color: var(--text-color);
}

/* Nav Controls Container for Toggle and Menu */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Theme Toggle Button Styling */
#theme-toggle {
    background: var(--secondary-color);
    border: 1px solid var(--text-color);
    color: var(--text-color);
    font-size: 1.1rem;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    outline: none;
}
body[data-theme="light"] #theme-toggle {
    background: #e0e0e0;
}

#theme-toggle:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border-color: var(--accent-color);
}

/* Toggle Icons Visibility */
.light-icon { display: none; } /* Default state hidden */
.dark-icon { display: none; }  /* Default state hidden */

/* In Dark Theme, show the SUN icon (to switch to Light) */
body[data-theme="dark"] .light-icon { 
    display: block; 
    color: var(--accent-color); 
}
/* In Light Theme, show the MOON icon (to switch to Dark) */
body[data-theme="light"] .dark-icon { 
    display: block; 
    color: #444; 
}

/* Menu Toggle Styling (Hidden on Desktop, Visible on Mobile) */
.menu-toggle {
    /* Hide the menu toggle button on large screens */
    display: none; 
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
}


/* --- Hero Section --- */
#hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: left;
    padding: 0 20px;
}

.hero-content {
    max-width: 800px;
}

.greeting {
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 10px;
}

.hero-content h2 {
    color: var(--text-color);
    font-weight: 300;
    margin-bottom: 20px; 
}

/* Hero Contact Links Styling */
.contact-links-hero {
    margin-bottom: 20px;
}

.contact-links-hero p {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-color);
}

.contact-links-hero i {
    color: var(--accent-color);
    margin-right: 8px;
}

.summary-intro {
    color: var(--text-color);
}

.cta-buttons {
    margin-top: 30px;
}

.btn {
    padding: 10px 25px;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    margin-right: 15px;
    border: 2px solid transparent;
}

.primary-btn {
    background-color: var(--accent-color);
    color: var(--bg-color);
}
body[data-theme="light"] .primary-btn {
    color: var(--secondary-color);
}

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

.secondary-btn {
    background-color: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
}

.secondary-btn:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

.social-links {
    margin-top: 40px;
}

.social-links a {
    font-size: 1.5rem;
    margin-right: 20px;
    color: var(--text-color);
}
.social-links a:hover {
    color: var(--accent-color);
}


/* --- About Section --- */
.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.contact-info {
    background-color: var(--secondary-color);
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
    width: 100%;
    max-width: 500px;
    box-shadow: 0 2px 5px var(--card-shadow);
}
body[data-theme="light"] .contact-info {
    border: 1px solid #ddd;
}


.contact-info h3 {
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 10px;
    margin-bottom: 15px;
    color: var(--accent-color);
}
body[data-theme="dark"] .contact-info h3 {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--accent-color);
}

.contact-info p {
    margin-bottom: 8px;
    text-align: left;
    color: var(--text-color);
}

.contact-info i {
    color: var(--accent-color);
    margin-right: 10px;
}

/* --- Skills Section --- */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.skill-category {
    background-color: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--card-shadow);
    transition: background-color 0.3s;
}
body[data-theme="light"] .skill-category {
    border: 1px solid #ddd;
}

.skill-category h3 {
    color: var(--accent-color);
    border-bottom: 2px solid rgba(0, 188, 212, 0.3);
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.skill-category ul {
    list-style-type: none;
}

.skill-category li {
    padding: 5px 0;
    font-size: 0.95rem;
    color: var(--text-color);
}

/* --- Experience Section (Timeline) --- */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
}
body[data-theme="light"] .timeline::before {
    background: rgba(0, 0, 0, 0.1);
}

.timeline-item {
    margin-bottom: 50px;
    position: relative;
    padding-left: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 5px;
    left: -10px;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 3px solid var(--bg-color);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 5px;
}

.timeline-content {
    background-color: var(--secondary-color);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px var(--card-shadow);
    transition: background-color 0.3s;
}
body[data-theme="light"] .timeline-content {
    border: 1px solid #ddd;
}

.timeline-content h3 {
    margin-top: 0;
    font-size: 1.4rem;
    color: var(--text-color);
}
body[data-theme="dark"] .timeline-content h3 { color: white; }
body[data-theme="light"] .timeline-content h3 { color: #111; }

.timeline-content p.location {
    font-style: italic;
    color: #aaa;
    margin-bottom: 10px;
}
body[data-theme="light"] .timeline-content p.location { color: #777; }


.timeline-content ul {
    list-style-type: disc;
    margin-left: 20px;
    padding-left: 0;
    color: var(--text-color);
}
body[data-theme="dark"] .timeline-content ul { color: #ccc; }
body[data-theme="light"] .timeline-content ul { color: #555; }


/* --- Projects Section --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.project-card {
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--card-shadow);
    border-top: 4px solid var(--accent-color);
    transition: transform 0.3s ease, background-color 0.3s;
}
body[data-theme="light"] .project-card {
    border: 1px solid #ddd;
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-tech {
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.project-link {
    display: inline-block;
    margin-top: 15px;
    font-weight: 600;
}

.project-link i {
    margin-right: 5px;
}

/* --- CONTACT SECTION (Refined Structure) --- */
#contact {
    text-align: center;
}

.contact-container {
    max-width: 1000px;
    margin: 40px auto;
    display: flex;
    gap: 30px;
    align-items: flex-start;
    text-align: left;
}

.contact-details-box {
    flex: 1;
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--card-shadow);
    transition: background-color 0.3s;
}
body[data-theme="light"] .contact-details-box {
    border: 1px solid #ddd;
}

.contact-details-box h3 {
    color: var(--accent-color);
    border-bottom: 2px solid rgba(0, 188, 212, 0.3);
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.contact-details-box p {
    margin-bottom: 15px;
    color: var(--text-color);
}

.contact-details-box i {
    color: var(--accent-color);
    margin-right: 10px;
}

.social-links-contact {
    margin-top: 15px;
}

.social-links-contact a {
    font-size: 1.8rem;
    margin-right: 15px;
    color: var(--text-color);
}
.social-links-contact a:hover {
    color: var(--accent-color);
}

#contact-form {
    flex: 1;
    background-color: var(--secondary-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--card-shadow);
    transition: background-color 0.3s;
}
body[data-theme="light"] #contact-form {
    border: 1px solid #ddd;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #333;
    border-radius: 4px;
    background-color: #2a2a2a;
    color: var(--text-color);
    font-size: 1rem;
    transition: background-color 0.3s, border-color 0.3s;
}
body[data-theme="light"] .form-group input,
body[data-theme="light"] .form-group textarea {
    background-color: #f7f7f7;
    border-color: #ccc;
    color: #111;
}

.auth-note {
    max-width: 1000px;
    margin: 20px auto;
    padding: 15px;
    background-color: var(--secondary-color);
    border-left: 4px solid var(--accent-color);
    border-radius: 4px;
    text-align: left;
    font-size: 0.9rem;
    box-shadow: 0 1px 3px var(--card-shadow);
}
body[data-theme="dark"] .auth-note { background-color: #333; }
body[data-theme="light"] .auth-note { background-color: #fff; border: 1px solid #ddd; }


/* --- Footer --- */
footer {
    text-align: center;
    padding: 25px 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #888;
    font-size: 0.9rem;
}
body[data-theme="light"] footer {
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    color: #777;
}

/* --- Media Queries (Responsiveness) --- */
@media (max-width: 768px) {
	
    /* Menu Toggle is visible on mobile */
    .menu-toggle {
        display: block; 
    }
    
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }
    
    .contact-links-hero {
        text-align: center;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 60px; 
        left: 0;
        background-color: var(--secondary-color);
        padding: 10px 0;
        text-align: center;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    body[data-theme="light"] .nav-links {
        border-top: 1px solid rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li {
        margin: 10px 0;
    }
    
    .timeline {
        padding-left: 10px;
    }

    .timeline::before {
        left: 5px;
    }

    .timeline-item::before {
        left: -5px;
    }
    
    .timeline-item {
        padding-left: 20px;
    }

    .contact-container {
        flex-direction: column; /* Stacks columns on small screens */
    }
}


.live-duration {
    display: inline-block;
    margin-top: 5px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-color);
}
.live-duration {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-color);
}

.overall-exp {
    margin-top: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
}