/* 1. SETUP & CINEMATIC THEMES */
:root {
    /* Dark Mode (Default) */
    --bg-dark: #0A192F;
    --text-dark: #ccd6f6;
    --heading-dark: #e6f1ff;
    --accent-dark: #14B8A6; /* Teal */
    --card-bg-dark: #112240;
    --shadow-dark: rgba(2, 12, 27, 0.7);

    /* Light Mode */
    --bg-light: #F8F9FA;
    --text-light: #495057;
    --heading-light: #212529;
    --accent-light: #3F51B5; /* Indigo */
    --card-bg-light: #FFFFFF;
    --shadow-light: rgba(108, 117, 125, 0.15);

    /* General Variables */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    --header-height: 70px;
    --transition-speed: 0.3s ease;
}

/* Apply themes via body class */
body {
    --bg-color: var(--bg-dark);
    --text-color: var(--text-dark);
    --heading-color: var(--heading-dark);
    --accent-color: var(--accent-dark);
    --card-bg: var(--card-bg-dark);
    --shadow-color: var(--shadow-dark);
}

body.light-mode {
    --bg-color: var(--bg-light);
    --text-color: var(--text-light);
    --heading-color: var(--heading-light);
    --accent-color: var(--accent-light);
    --card-bg: var(--card-bg-light);
    --shadow-color: var(--shadow-light);
}

/* 2. GENERAL & BACKGROUND STYLES */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    line-height: 1.7;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    position: relative;
    overflow-x: hidden;
}

/* AI-themed animated background */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image:
        linear-gradient(rgba(10, 25, 47, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 25, 47, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: pan 60s linear infinite;
    opacity: 0.3;
}

body.light-mode .background-animation {
     background-image:
        linear-gradient(rgba(200, 200, 200, 0.2) 1px, transparent 1px),
        linear-gradient(90deg, rgba(200, 200, 200, 0.2) 1px, transparent 1px);
}

@keyframes pan {
    from { background-position: 0 0; }
    to { background-position: -200px -200px; }
}


/* Custom Scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-color); }
::-webkit-scrollbar-thumb {
    background-color: var(--accent-color);
    border-radius: 10px;
    border: 3px solid var(--bg-color);
}
::-webkit-scrollbar-thumb:hover { background-color: color-mix(in srgb, var(--accent-color), #fff 20%); }

/* 3. TYPOGRAPHY & SHARED */
h1, h2, h3 {
    font-family: var(--font-heading);
    color: var(--heading-color);
    margin-bottom: 1rem;
    font-weight: 700;
}
h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 2.5rem); margin-bottom: 2.5rem; }
h3 { font-size: 1.25rem; color: var(--accent-color); }

a { color: var(--accent-color); text-decoration: none; transition: color var(--transition-speed); }
a:hover { color: color-mix(in srgb, var(--accent-color), #fff 20%); }

.content-section {
    padding: 6rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.content-section.visible { opacity: 1; transform: translateY(0); }

.btn {
    display: inline-block;
    padding: 0.75rem 1.75rem;
    background-color: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    font-family: var(--font-body);
    font-weight: bold;
    border-radius: 4px;
    transition: all var(--transition-speed);
}
.btn:hover, .btn:focus {
    background-color: var(--accent-color);
    color: var(--bg-color);
    box-shadow: 0 0 15px color-mix(in srgb, var(--accent-color), transparent 50%);
    transform: translateY(-3px);
}

/* 4. HEADER & NAVIGATION */
.header {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    background-color: color-mix(in srgb, var(--bg-color), transparent 15%);
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
    box-shadow: 0 2px 4px transparent;
}
.header.scrolled {
    box-shadow: 0 2px 4px var(--shadow-color);
}

.logo { font-family: var(--font-heading); font-size: 1.5rem; }
.nav-links { list-style: none; display: flex; gap: 2rem; }
.nav-links a {
    color: var(--text-color);
    font-weight: bold;
    position: relative;
    padding: 5px 0;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width var(--transition-speed);
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a.active { color: var(--accent-color); }

.header-actions { display: flex; align-items: center; gap: 1rem; }

.theme-toggle-btn {
    background: none; border: none; cursor: pointer; color: var(--accent-color);
    padding: 5px; line-height: 0;
}
.theme-toggle-btn svg { display: none; width: 22px; height: 22px; transition: transform 0.4s ease; }
.theme-toggle-btn:hover svg { transform: rotate(15deg); }
.moon-icon { display: block; }
body.light-mode .moon-icon { display: none; }
body.light-mode .sun-icon { display: block; }

.hamburger { display: none; } /* Mobile styles below */

/* 5. SECTIONS */
/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 1rem;
}
.profile-pic {
    width: 160px; height: 160px;
    border-radius: 50%;
    border: 4px solid var(--accent-color);
    margin-bottom: 1.5rem;
    object-fit: cover;
    box-shadow: 0 0 25px color-mix(in srgb, var(--accent-color), transparent 50%);
}
.hero-tagline { font-size: 1.2rem; margin: 1rem 0 2.5rem; max-width: 600px; color: var(--text-color); }
.social-links { display: flex; gap: 1.5rem; }
.social-links a { color: var(--text-color); }
.social-links a:hover { color: var(--accent-color); transform: translateY(-3px); }

/* About */
.skills-container { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.5rem; margin-bottom: 2.5rem; }
.skill-tag {
    background-color: color-mix(in srgb, var(--accent-color), transparent 85%);
    color: var(--accent-color);
    padding: 0.5rem 1.25rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
}

/* Experience */
.experience-item {
    padding: 1.5rem 2rem;
    border-left: 3px solid var(--accent-color);
    position: relative;
    transition: all var(--transition-speed);
}
.experience-item::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: color-mix(in srgb, var(--accent-color), transparent 95%);
    opacity: 0;
    transition: opacity var(--transition-speed);
    z-index: -1;
}
.experience-item:hover {
    border-left-color: color-mix(in srgb, var(--accent-color), #fff 20%);
    transform: translateX(10px);
}
.experience-item:hover::before { opacity: 1; }

.experience-item .company { color: var(--accent-color); }
.experience-details { margin-bottom: 1rem; color: var(--text-color); opacity: 0.8; }
.experience-item ul { list-style-type: none; }
.experience-item ul li { position: relative; padding-left: 25px; margin-bottom: 0.5rem; }
.experience-item ul li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* Projects */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.project-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 10px 30px -15px var(--shadow-color);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}
.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px -15px var(--shadow-color);
}
.project-image-container { overflow: hidden; border-radius: 8px 8px 0 0; }
.project-card img {
    width: 100%; height: 200px;
    object-fit: cover;
    transition: transform 0.4s ease-out, filter 0.4s ease-out;
}
.project-card:hover img { transform: scale(1.05); filter: brightness(1.1); }
.project-content { padding: 1.5rem; display: flex; flex-direction: column; flex-grow: 1; }
.project-tags { margin: 1rem 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.project-tags .tag {
    background-color: color-mix(in srgb, var(--bg-color), #fff 10%);
    color: var(--accent-color);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
}
.project-links { margin-top: auto; display: flex; gap: 1rem; }
.project-links .btn-secondary { background-color: var(--accent-color); color: var(--bg-color); }
.project-links .btn-secondary:hover { background-color: color-mix(in srgb, var(--accent-color), #fff 20%); }

/* Contact */
#contact { text-align: center; }
#contact p { max-width: 600px; margin: 0 auto 2.5rem; }
.contact-email-btn {
    font-size: 1.2rem;
    padding: 1rem 2rem;
    margin-top: 1rem;
}

/* 6. FOOTER */
footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-color);
    opacity: 0.7;
}
.footer-social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}
.footer-social-links a { color: var(--text-color); }
.footer-social-links a:hover { color: var(--accent-color); }

/* 7. RESPONSIVENESS */
@media (max-width: 768px) {
    .header { padding: 0 1.5rem; }
    .header .btn { display: none; }
    .nav-links {
        position: fixed;
        top: var(--header-height);
        right: -100%;
        width: min(75vw, 400px);
        height: 100vh;
        background-color: var(--card-bg);
        flex-direction: column;
        align-items: center;
        padding-top: 3rem;
        gap: 2.5rem;
        transition: right var(--transition-speed);
        box-shadow: -10px 0px 30px -15px var(--shadow-color);
    }
    .nav-links.active { right: 0; }
    
    .hamburger {
        display: flex;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        background: none;
        border: none;
        z-index: 101; /* Ensure it's above the nav menu */
    }
    .bar {
        width: 25px; height: 3px;
        background-color: var(--text-color);
        border-radius: 5px;
        transition: all 0.3s ease-in-out;
    }
    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    .content-section { padding: 4rem 1.5rem; }
}