/* --- CSS Variables --- */
/* Using variables makes it easy to change the color scheme consistently. */
:root {
    --primary-color: #00aaff; /* A vibrant blue */
    --secondary-color: #0abdc6; /* A teal accent */
    --bg-color: #0f172a; /* A dark navy blue */
    --surface-color: rgba(255, 255, 255, 0.05); /* For glass effect */
    --border-color: rgba(255, 255, 255, 0.1);
    --text-color: #e2e8f0; /* An off-white */
    --heading-color: #ffffff;
}

/* --- Global Resets & Base Styles --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* Ensures padding and border are included in the element's total width and height */
}

html {
    scroll-behavior: smooth; /* Enables smooth scrolling when clicking nav links */
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* --- Utility Classes --- */
.container {
    max-width: 1100px;
    margin: 0 auto; /* Centers the content */
    padding: 0 2rem;
}

/* --- Typography --- */
h1, h2, h3 {
    color: var(--heading-color);
    font-weight: 600;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    text-align: center;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 0.5rem;
}

section {
    padding: 6rem 0;
    text-align: center;
}

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

a:hover {
    color: var(--secondary-color);
}

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: #fff;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.3s ease;
    border: none;
}

.btn:hover {
    background: var(--secondary-color);
    color: #fff;
    transform: translateY(-3px); /* Lifts the button slightly on hover */
}

/* --- Header & Navigation --- */
header {
    background: rgba(15, 23, 42, 0.8);
    -webkit-backdrop-filter: blur(10px); /* Frosted glass effect for Safari */
    backdrop-filter: blur(10px); /* Frosted glass effect */
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: fixed; /* Makes the header stick to the top */
    width: 100%;
    z-index: 1000; /* Ensures header stays on top of other content */
}

nav.container {
    display: flex;
    justify-content: space-between; /* Pushes logo to the left and links to the right */
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--heading-color);
}

nav ul {
    list-style: none;
    display: flex;
    gap: 1.5rem; /* Space between nav items */
}

/* --- Hero Section --- */
#hero {
    height: 100vh; /* Takes up the full viewport height */
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: var(--bg-color) url('https://www.transparenttextures.com/patterns/cubes.png');
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between; /* Puts space between text and image */
    gap: 2rem;
}

.hero-content {
    flex: 1; /* Allows the text content to take up available space */
    text-align: left; /* Aligns text to the left */
}

.hero-content h1 {
    font-size: 3rem;
    line-height: 1.2;
}

.profile-photo {
    width: 300px; /* Control the size of your photo */
    height: 300px;
    border-radius: 50%; /* Makes the photo circular */
    border: 5px solid var(--primary-color); /* Adds a colored border */
    object-fit: cover; /* Prevents the image from being distorted */
    box-shadow: 0 0 25px rgba(0, 170, 255, 0.4); /* Adds a subtle glow */
}

/* --- Skills Section --- */
.skills-grid {
    display: flex;
    flex-wrap: wrap; /* Allows items to wrap to the next line on smaller screens */
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

/* --- Projects Section --- */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Creates a responsive grid */
    gap: 2rem;
    text-align: left;
    margin-top: 2rem;
}

.project-card {
    background: var(--surface-color);
    -webkit-backdrop-filter: blur(5px);
    backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.project-card h3 {
    color: var(--primary-color);
}

.project-card p {
    flex-grow: 1; /* Pushes the link to the bottom, making cards of different heights look uniform */
}


/* --- Contact Section --- */
.contact-details {
    margin: 2rem 0;
    line-height: 2; /* Adds extra spacing between the email and phone lines */
}

.contact-form {
    max-width: 600px;
    margin: 2rem auto 0;
    text-align: left;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background: var(--surface-color);
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}


/* --- Responsive Design --- */
@media (max-width: 768px) {
    h2 {
        font-size: 2rem;
    }

    #hero h1 {
        font-size: 2.5rem;
    }

    /* Stacks nav items on smaller screens */
    nav.container {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    section {
        padding: 4rem 0;
    }

    .hero-container {
        flex-direction: column-reverse; /* Stacks image on top of text on mobile */
        text-align: center;
    }

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

    .profile-photo {
        width: 200px;
        height: 200px;
        margin-bottom: 2rem;
    }
}