:root {
    --font-family: 'Roboto', sans-serif;
    --bg-color: #0d1117;
    --card-bg: #131b2a;
    --navbar-bg: #0d1421;
    --form-bg: #162032;
    --text-color: #e0e6ed;
    --footer-color: #8899aa;
    --accent-color: #1f6feb;
    --highlight-color: #d63384;
    --border-color: #30363d;
    --form-border-radius: 6px;
    --max-width: 900px;
    --transition-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-family);
}

body {
    background-color: white;
    color: black;
    line-height: 1.6;

}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: black;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.navbar .nav-links {
    list-style: none;
    display: flex;
    gap: 1rem;
}

.navbar .nav-links li a {
    color: var(--text-color);
    text-decoration: none;
    transition: color var(--transition-speed);
    transition: all 0.3s ease;
}

.navbar .nav-links li a:hover {
    color: var(--accent-color);
}

/* intro section */
.intro {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 0;
}

#particles-js canvas {
    filter: drop-shadow(0 0 6px #1f6feb) drop-shadow(0 0 8px rgba(3, 70, 255, 0.4)) drop-shadow(0 0 5px rgba(89, 3, 250, 0.3));
}

.intro-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.intro-text h1 {
    font-size: 2rem;
    color: white;
}

.intro-image img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    border: 3px solid var(--accent-color);
    object-fit: cover;
    position: sticky;
    top: 120px;
}

/* About Section */
.about-section,
#experience,
#skills,
#education,
#projects {
    padding: 4rem 2rem;
    max-width: var(--max-width);
    margin: auto;
}


/* education & experience */
.timeline-section {
    padding: 4rem 2rem;

}

.timeline {
    border-left: 3px solid var(--accent-color);
    margin-left: 20px;
    padding-left: 40px;
    position: relative;
    margin: 2rem 0;

}

.timeline-item {
    margin-bottom: 2rem;
    position: relative;
    padding-left: 40px;
}

.timeline-item::before {
    content: "";
    position: absolute;
    top: 4px;
    left: -52.5px;
    width: 18px;
    height: 18px;
    background: var(--highlight-color);
    border-radius: 50%;
    border: 2px solid white;
    z-index: 2;
}

.timeline-item::after {
    content: "";
    position: absolute;
    top: 14px;
    left: -35px;
    width: 56px;
    height: 2px;
    background-color: var(--accent-color);
    z-index: 1;
}

.timeline-item h3 {
    margin-bottom: 0.2rem;
    color: var(--accent-color);
}

/* Skills */
.skills-section {
    padding: 4rem 2rem;
    text-align: center;
}

.skills-section ul {
    list-style: none;
    margin-top: 1rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;

}

.skills-section li {
    background-color: lightblue;
    padding: 0.6rem 1rem;
    border-radius: var(--form-border-radius);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

/* project section */
.projects-section {
    padding: 4rem 2rem;
    background-color: var(--bg-color);
    text-align: center;
}

.projects-section h2 {
    color: var(--accent-color);
    font-size: 2.2rem;
    margin-bottom: 2rem;

}

.projects-section .project {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin: 1.5rem auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    max-width: 700px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.projects-section .project:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.project h3 {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.project p {
    color: var(--text-color);
    font-size: 1rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.project-buttons a {
    display: inline-block;
    padding: 10px 18px;
    font-size: 0.95rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    color: #fff;
    transition: background 0.3s ease;
}

.btn-live {
    background: var(--accent-color);
}

.btn-code {
    background: var(--highlight-color);
}

.project-buttons a:hover {
    transform: translateY(-2px);
    opacity: 0.92;
}

/* Contact */
.contact-section {
    padding: 5rem 2rem;
    text-align: center;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.contact-section h2 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    clear: var(--accent-color);
}

.contact-subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
    color: var(--footer-color);
}

.contact-section form {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    max-width: 600px;
    margin: auto;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 1rem;
    background-color: var(--form-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--form-border-radius);
    color: var(--text-color);
    font-size: 1rem;
    transition: border 0.3s ease, box-shadow 0.3s ease;
}

.input-group input:focus,
.input-group textarea:focus {
    border: 1px solid var(--accent-color);
    outline: none;
    box-shadow: 0 0 8px rgba(78, 168, 222, 0.4);
}

.contact-section button {
    padding: 1rem;
    font-weight: bold;
    font-size: 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--highlight-color));
    color: white;
    border: none;
    border-radius: var(--form-border-radius);
    cursor: pointer;
    transition: background 0.3s ease, transform 0.2s ease;

}

.contact-section button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 76, 96, 0.2);
}

/* footer */
footer {
    background-color: var(--navbar-bg);
    color: var(--footer-color);
    text-align: center;
    padding: 20px 0;
    font-family: var(--font-family);
    border-top: 1px solid var(--border-color);
}

footer p {
    margin-bottom: 10px;
    font-size: 16px;
}

footer .brand {
    color: var(--accent-color);
    font-weight: bold;
    letter-spacing: 0.5px;
    cursor: pointer;
}

.socials {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 10px;
}

.socials a {
    color: #ffffffcc;
    background: #1f2b3e;
    padding: 10px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.3s ease;
    width: 40px;
    height: 40px;
    text-decoration: none;
}

.skills-section li:hover,
.socials a:hover {
    color: #fff;
    background-color: var(--highlight-color);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 4px 12px rgba(255, 76, 96, 0.5);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    height: 3px;
    width: 25px;
    background: var(--text-color);
    border-radius: 5px;
    transition: all var(--transition-speed) ease;
}

.nav-links {
    transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease;
}

/* Responsive  */
@media (max-width:768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        left: -100%;
        width: 70%;
        height: 100vh;
        background-color: var(--navbar-bg);
        flex-direction: column;
        align-items: flex-start;
        padding: 5rem 2rem;
        gap: 1.5rem;
        z-index: 999;
        opacity: 0;
        transform: translateX(-100%);
    }

    .nav-links.active {
        left: 0;
        opacity: 1;
        transform: translateX(0);
    }

    .nav-links li a {
        font-size: 1.2rem;
        color: var(--text-color);
        transition: all var(--transition-speed) ease;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .intro {
        flex-direction: column;
        text-align: center;
        padding: 2rem 1rem;
    }

    .navbar .nav-links {
        flex-direction: column;
        gap: 0.5rem;
        margin-top: 1rem;
    }

    .intro-image img {
        position: relative;
        top: auto;
        width: 180px;
        height: 180px;
        margin-top: 2rem;
    }

    .skills-section ul {
        /* flex-direction: column; */
        align-items: center;
        flex-wrap: wrap;
    }

    .skills-section li {
        width: 16rem;
    }

    .contact-section form {
        padding: 0 1rem;
    }
}