:root {
    /* Pure Black Main Background */
    --bg-color: #000000;
    
    /* Box Color: Distinct Dark Grey (Lighter than background) */
    --box-bg: #111111; 
    
    --text-color: #ffffff;
    
    /* Neon Colors */
    --main-color: #00eeff;  /* Cyan */
    --gradient-color: #0061ff; /* Electric Blue */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
    /* Subtle grid pattern background */
    background-image: radial-gradient(#1a1a1a 1px, transparent 1px);
    background-size: 30px 30px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #222;
    z-index: 1000;
}

.logo {
    font-size: 1.7rem;
    font-weight: 700;
    cursor: pointer;
    /* Gradient Text */
    background: linear-gradient(45deg, var(--main-color), var(--gradient-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-links li {
    display: inline-block;
    margin: 0 1.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
    transition: 0.3s;
}

.nav-links a:hover {
    color: var(--main-color);
    text-shadow: 0 0 10px var(--main-color);
}

.menu-btn {
    display: none;
    font-size: 1.5rem;
    color: var(--text-color);
}

/* --- OPTIMIZED BOX LAYOUT LOGIC --- */

/* 1. General Box Styling */
section, .hero {
    background: var(--box-bg);
    border-radius: 30px;
    
    /* Lighter border to make the box shape visible */
    border: 1px solid #2a2a2a; 
    
    box-shadow: 0 0 30px rgba(0,0,0,0.8);
    position: relative;
    overflow: hidden;
    
    width: 90%;           
    max-width: 1200px;     
    margin: 2rem auto;     
    padding: 4rem 3rem;   
}

/* 2. Hero Section (Home) - Sized to fill screen */
.hero {
    margin-top: 100px;    /* Clear the fixed navbar */
    min-height: 85vh;     /* Occupy 85% of viewport height */
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #0f0f0f 0%, #000000 100%);
}

/* 3. Other Sections - Sized to fit content */
section {
    height: auto;         /* Box height adjusts to content */
    margin-bottom: 2rem;
}

/* Typography & Content */
.hero-content h3 {
    font-size: 2rem;
    font-weight: 700;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.2;
    margin: 10px 0;
    /* Gradient Text */
    background: linear-gradient(to right, var(--main-color), var(--gradient-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-content p {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 2rem;
}

.hero-content span {
    color: var(--main-color);
    text-shadow: 0 0 10px var(--main-color);
}

.social-icons a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 3rem;
    height: 3rem;
    background: transparent;
    border: 2px solid var(--main-color);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--main-color);
    margin: 0 1rem 2rem 0;
    transition: 0.4s;
    text-decoration: none;
    box-shadow: 0 0 5px var(--main-color);
}

.social-icons a:hover {
    background: var(--main-color);
    color: #000;
    box-shadow: 0 0 20px var(--main-color), 0 0 40px var(--main-color);
    transform: translateY(-5px);
}

.btn {
    display: inline-block;
    padding: 0.8rem 2.5rem;
    background: var(--main-color);
    border-radius: 3rem;
    color: #000;
    font-weight: 700;
    letter-spacing: 1px;
    text-decoration: none;
    transition: 0.4s ease-in-out;
    border: 2px solid var(--main-color);
    box-shadow: 0 0 10px var(--main-color);
}

.btn:hover {
    box-shadow: 0 0 20px var(--main-color), 
                0 0 40px var(--main-color), 
                0 0 80px var(--main-color);
    background: transparent;
    color: var(--main-color);
    transform: scale(1.05);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 2px;
    /* Gradient Text */
    background: linear-gradient(to right, var(--main-color), var(--gradient-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.about-content {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-align: center;
}

.education-timeline {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.edu-box {
    background: #000;
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid #222;
    min-width: 250px;
    transition: 0.3s;
}

.edu-box:hover {
    border-color: var(--main-color);
    box-shadow: 0 0 15px rgba(0, 238, 255, 0.2);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-card {
    background: #000;
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    transition: 0.4s;
    border: 1px solid #222;
}

.skill-card:hover {
    border-color: var(--main-color);
    box-shadow: 0 0 20px rgba(0, 238, 255, 0.4);
    transform: translateY(-5px);
}

.skill-card i {
    font-size: 3rem;
    color: var(--main-color);
    margin-bottom: 1rem;
    text-shadow: 0 0 10px var(--main-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: #000;
    border-radius: 1rem;
    overflow: hidden;
    padding: 2rem;
    transition: 0.4s;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid #222;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--main-color);
    box-shadow: 0 0 25px rgba(0, 238, 255, 0.3);
}

.card-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.badge {
    background: rgba(0, 238, 255, 0.1);
    color: var(--main-color);
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--main-color);
    font-size: 0.8rem;
    margin-bottom: 1rem;
    display: inline-block;
}

.tech-stack {
    margin: 1rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-stack span {
    font-size: 0.8rem;
    border: 1px solid #444;
    padding: 2px 8px;
    border-radius: 12px;
    color: #aaa;
}

.btn-small {
    text-decoration: none;
    color: var(--main-color);
    font-weight: 600;
    margin-top: auto;
    transition: 0.3s;
}

.btn-small:hover {
    text-shadow: 0 0 10px var(--main-color);
    letter-spacing: 1px;
}

.contact-box {
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.info-item {
    margin: 1rem 0;
    font-size: 1.2rem;
}

.info-item i {
    color: var(--main-color);
    margin-right: 10px;
    text-shadow: 0 0 5px var(--main-color);
}

.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    border-top: 1px solid #222;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; 
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    /* Mobile Box Adjustments */
    section, .hero {
        width: 95%;
        margin: 1.5rem auto;
        padding: 2rem 1.5rem;
    }
}

/* --- ACTIVE NAVIGATION STATE --- */
.nav-links a.active {
    color: var(--main-color);
    text-shadow: 0 0 10px var(--main-color);
    border-bottom: 2px solid var(--main-color); /* Optional: Adds a line under the text */
}
/* --- LIGHT MODE THEME --- */
.light-mode {
    --bg-color: #f0f2f5;       /* Light Grey Background */
    --box-bg: #ffffff;         /* Pure White Cards */
    --text-color: #111111;     /* Dark Text */
    --main-color: #0061ff;     /* We switch Cyan to Electric Blue for better visibility */
    --gradient-color: #00c6ff; /* Secondary blue */
}

/* Fix shadows for light mode so they aren't too harsh */
body.light-mode section, 
body.light-mode .hero {
    box-shadow: 0 10px 30px rgba(0,0,0,0.1); /* Soft shadow */
    border: 1px solid #e2e8f0;
}

body.light-mode .navbar {
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid #e2e8f0;
}

body.light-mode .project-card,
body.light-mode .skill-card,
body.light-mode .edu-box {
    background: #f8fafc; /* Very light grey for inner cards */
    border: 1px solid #e2e8f0;
}

/* Theme Button Style */
.theme-btn {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    margin-left: 20px;
    transition: 0.3s;
}
.theme-btn:hover {
    color: var(--main-color);
    transform: rotate(180deg); /* Spin effect on hover */
}

/* --- FIXES FOR LIGHT MODE VISIBILITY --- */

/* 1. Fix Project & Skill Card Titles (Was forced to #fff) */
body.light-mode .card-content h3, 
body.light-mode .skill-card h3,
body.light-mode .edu-box h4 {
    color: #111111; /* Turn text dark black */
}

/* 2. Fix Tech Stack Text (Was #aaa which is too light for white paper) */
body.light-mode .tech-stack span {
    color: #333333; 
    border-color: #cbd5e1; /* Darker border */
    background: #e2e8f0;   /* Slight grey pill background */
}

/* 3. Fix Skill Icons */
body.light-mode .skill-card i {
    text-shadow: none; /* Remove neon glow so it looks clean */
}

/* 4. Fix Navbar Links (Ensure they are dark) */
body.light-mode .nav-links a {
    color: #333;
}
body.light-mode .nav-links a:hover,
body.light-mode .nav-links a.active {
    color: var(--main-color); /* Blue in light mode */
}

/* 5. Fix "Get In Touch" Icons */
body.light-mode .info-item i {
    text-shadow: none;
}
body.light-mode .info-item span {
    color: #222;
}

/* 6. Fix Footer */
body.light-mode .footer p {
    color: #444;
}

/* --- FIX HERO SECTION VISIBILITY IN LIGHT MODE --- */

/* 1. Force the Hero Box Background to White/Light Grey */
body.light-mode .hero {
    background: var(--box-bg); /* Sets it to White */
    /* Optional: A subtle light gradient so it looks premium, not flat */
    background: radial-gradient(circle at center, #ffffff 0%, #f1f5f9 100%);
}

/* 2. Fix "Hello, I'm" text */
body.light-mode .hero-content h3 {
    color: #111111; /* Force Dark Black */
}

/* 3. Fix the "I am a..." text */
body.light-mode .hero-content p {
    color: #333333; /* Dark Grey */
}

/* 4. Ensure the Name Gradient looks good on white */
body.light-mode .hero-content h1 {
    /* We use the darker blue variable for better contrast on white */
    background: linear-gradient(to right, #0061ff, #00c6ff); 
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}