/* ---------------------------------- */
/* 1. Global & Variables */
/* ---------------------------------- */
:root {
    /* Colors - Light Mode */
    --primary-color: #3f51b5; /* Indigo */
    --accent-color: #ff4081; /* Pink */
    --text-color: #333;
    --bg-color: #ffffff;
    --card-bg: #f8f9fa;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --heading-color: #222;
}

/* Dark Mode Variables */
.dark-mode {
    --primary-color: #7986cb; 
    --accent-color: #ff80ab;
    --text-color: #e0e0e0;
    --bg-color: #1a1a1a; /* Dark background */
    --card-bg: #2c2c2c;
    --nav-bg: rgba(30, 30, 30, 0.95);
    --shadow-color: rgba(255, 255, 255, 0.1);
    --heading-color: #fff;
}

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

body {
    font-family: 'Poppins', sans-serif; /* Modern Font */
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.5s, color 0.5s;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 60px 20px;
}

h2 {
    color: var(--heading-color);
    text-align: center;
    font-size: 2.2em;
    font-weight: 700;
    margin-bottom: 50px;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
    display: table;
    margin-left: auto;
    margin-right: auto;
}
h2::after {
    content: '';
    display: block;
    width: 60%;
    height: 4px;
    background: var(--primary-color);
    margin: 8px auto 0;
    border-radius: 2px;
}


/* ---------------------------------- */
/* 2. NAVBAR */
/* ---------------------------------- */
.navbar {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    background: var(--nav-bg);
    backdrop-filter: blur(10px); /* Premium look */
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow-color);
}
.navbar .logo {
    font-weight: 700;
    font-size: 1.6em;
    color: var(--primary-color);
}
.navbar .nav-links {
    display: flex;
    list-style: none;
    gap: 25px;
}
.navbar .nav-links li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: 0.3s;
    position: relative;
}
.navbar .nav-links li a:hover, .navbar .nav-links li a.active {
    color: var(--primary-color);
}
#theme-toggle {
    padding: 8px 12px;
    border: none;
    border-radius: 5px;
    background: var(--primary-color);
    color: #fff;
    cursor: pointer;
    font-size: 1.2em;
    transition: 0.3s;
}

/* ---------------------------------- */
/* 3. HERO SECTION */
/* ---------------------------------- */
#hero {
    background: linear-gradient(135deg, var(--primary-color), #303f9f);
    color: #fff;
    text-align: center;
    padding: 120px 20px;
}
.profile-img {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 5px solid #fff;
    margin-bottom: 20px;
    object-fit: cover;
}
.hero-content h1 {
    font-size: 3.5em;
    margin: 10px 0;
}
.hero-content .highlight {
    color: var(--accent-color);
}
.hero-content p {
    font-size: 1.6em;
    margin-bottom: 30px;
}
.btn {
    display: inline-block;
    margin: 10px;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: 0.3s;
}
.primary-btn {
    background: #fff;
    color: var(--primary-color);
}
.primary-btn:hover {
    background: var(--accent-color);
    color: #fff;
}
.secondary-btn {
    background: transparent;
    border: 2px solid #fff;
    color: #fff;
}
.secondary-btn:hover {
    background: #fff;
    color: var(--primary-color);
}

/* ---------------------------------- */
/* 4. ABOUT & SKILLS */
/* ---------------------------------- */
#about {
    background: var(--bg-color);
}
.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1em;
}

#skills {
    background: var(--card-bg);
}
.skills-container-wrapper {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
}
.skill-category {
    text-align: center;
    flex-basis: 45%;
    min-width: 300px;
}
.skill-category h3 {
    font-size: 1.8em;
    margin-bottom: 25px;
    color: var(--primary-color);
}
.skills {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}
.skill {
    padding: 8px 15px;
    border-radius: 20px;
    color: #fff;
    font-weight: 600;
    font-size: 0.9em;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.skill:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

/* Individual Skill Colors (kept for visual flair) */
.html { background:#e44d26; } .css { background:#264de4; } .js { background:#f0db4f; color:#000; }
.react { background:#61dbfb; color:#000; } .django { background:#092e20; } 
.python { background:#306998; } .numpy { background:#013243; } .pandas { background:#150458; } .sql { background:#e38c00; }

/* ---------------------------------- */
/* 5. PROJECTS */
/* ---------------------------------- */
.projects-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}
.project-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 15px;
    width: 350px;
    box-shadow: 0 8px 20px var(--shadow-color);
    transition: 0.4s;
    text-align: center;
}
.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px var(--shadow-color);
}
.project-card h3 {
    color: var(--heading-color);
    margin-bottom: 15px;
}
.tech-stack {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    margin: 15px 0;
}
.tech-stack span {
    background: var(--primary-color);
    opacity: 0.8;
    color: #fff;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 0.85em;
}

/* Project Call-to-Action Buttons */
.project-links {
    margin-top: 20px;
}
.project-btn {
    display: inline-block;
    padding: 8px 15px;
    border-radius: 20px;
    margin: 5px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9em;
    transition: 0.3s;
}
.live-btn {
    background: var(--primary-color);
    color: #fff;
}
.github-btn {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--primary-color);
}
.github-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

/* ---------------------------------- */
/* 6. CONTACT & FOOTER */
/* ---------------------------------- */
#contact {
    background: var(--bg-color);
    text-align: center;
}
#contact-form {
    display: flex;
    flex-direction: column;
    max-width: 550px;
    margin: auto;
    gap: 15px;
}
#contact-form input, #contact-form textarea {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--shadow-color);
    background: var(--card-bg);
    color: var(--text-color);
    width: 100%;
    transition: border 0.3s;
}
#contact-form input:focus, #contact-form textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}
.social-links { 
    margin-top: 30px; 
}
.social-links a {
    margin: 0 15px;
    color: var(--primary-color);
    font-size: 1.8em;
    transition: 0.3s;
}
.social-links a:hover {
    color: var(--accent-color);
    transform: scale(1.1);
}

/* Contact Form Success Message Styling */
.success-message {
    color: var(--primary-color); 
    background: #e6ffec; 
    padding: 10px;
    border-radius: 5px;
    font-weight: 600;
    margin-top: 10px;
    border: 1px solid var(--primary-color);
}
.dark-mode .success-message {
    background: #004d40;
    color: #a7ffeb;
}

footer {
    text-align: center;
    padding: 20px;
    background: #1f1f1f;
    color: #fff;
}

/* ---------------------------------- */
/* 7. ANIMATION & RESPONSIVENESS */
/* ---------------------------------- */

/* Scroll Animation */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}
.fade-in.is-visible { /* JS will add this class */
    opacity: 1;
    transform: translateY(0);
}

/* Media Queries for Mobile */
@media (max-width: 768px) {
    .navbar {
        padding: 10px 20px;
    }
    .navbar .nav-links {
        display: none; /* Hide for true mobile navigation */
    }
    
    #hero {
        padding: 80px 20px;
    }
    .hero-content h1 {
        font-size: 2.5em;
    }
    .hero-content p {
        font-size: 1.3em;
    }

    .projects-container {
        flex-direction: column;
        align-items: center;
    }
    .project-card {
        width: 100%;
        max-width: 400px;
    }

    .skills-container-wrapper {
        flex-direction: column;
    }
    .skill-category {
        min-width: unset;
        width: 100%;
    }
}