:root {
    --primary-color: #0d1a2f;
    --secondary-color: #1a2a44;
    --accent-color: #4a90e2;
    --light-text: #e0e7ff;
    --heading-font: 'Poppins', sans-serif;
    --body-font: 'Roboto', sans-serif;
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--body-font);
    background-color: var(--primary-color);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* Header */
#main-header {
    background: rgba(13, 26, 47, 0.8);
    padding: 15px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease-in-out;
}

#main-header.scrolled {
    padding: 10px 30px;
    background: rgba(13, 26, 47, 0.95);
}

.logo {
    font-family: var(--heading-font);
    font-weight: 700;
    font-size: 1.5em;
    color: var(--accent-color);
    text-decoration: none;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

nav a {
    color: var(--light-text);
    text-decoration: none;
    margin-left: 30px;
    font-size: 1em;
    font-weight: 600;
    transition: color 0.3s ease;
}

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

/* Sections */
.section {
    padding: 100px 50px;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

h1, h2 {
    font-family: var(--heading-font);
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--accent-color);
    text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
}

h1 {
    font-size: 3.5em;
    letter-spacing: 2px;
}

h2 {
    font-size: 2.5em;
}

p {
    color: #cdd9e5;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at top left, #1a2a44, #0d1a2f);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://via.placeholder.com/1920x1080?text=Background+Image') no-repeat center center/cover;
    opacity: 0.1;
    z-index: 1;
    animation: zoom-out 20s infinite alternate;
}

@keyframes zoom-out {
    from {
        transform: scale(1.1);
    }
    to {
        transform: scale(1);
    }
}

.hero-content {
    position: relative;
    z-index: 2;
}

.buttons button {
    padding: 15px 30px;
    margin: 0 15px;
    background: var(--accent-color);
    color: var(--primary-color);
    border: none;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.2);
}

.buttons button:hover {
    background: #5fa5ff;
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.4);
}

/* About Section */
.about {
    background-color: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
    box-shadow: inset 0 5px 20px rgba(0,0,0,0.2);
}

.profile-card {
    position: relative;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(74, 144, 226, 0.3);
    transition: all 0.5s ease;
}

.profile-card:hover {
    transform: rotate(5deg) scale(1.05);
}

.profile-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-content {
    max-width: 600px;
    text-align: left;
}

/* Projects Section */
.projects {
    background-color: var(--primary-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 30px;
}

.project-card {
    background: var(--secondary-color);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid rgba(74, 144, 226, 0.2);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    text-align: left;
    position: relative;
    overflow: hidden;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(74, 144, 226, 0.4);
}

.project-card h3 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

.project-card .project-details {
    padding-top: 20px;
}

.project-card .project-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    margin-top: 15px;
    display: inline-block;
    transition: transform 0.3s ease;
}

.project-card .project-link:hover {
    transform: translateX(5px);
}

/* Skills Section */
.skills {
    background-color: var(--secondary-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

.skill-item {
    background: rgba(74, 144, 226, 0.1);
    padding: 20px;
    border-radius: 10px;
    text-align: left;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.skill-item:hover {
    background: rgba(74, 144, 226, 0.2);
    transform: translateY(-5px);
}

.skill-name {
    font-weight: 600;
    color: var(--light-text);
    margin-bottom: 5px;
    display: block;
}

.progress-bar-container {
    height: 8px;
    background: #2e4057;
    border-radius: 5px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #4a90e2, #a1d9ff);
    transition: width 1s ease-in-out;
}


/* Research Section */
.research {
    background-color: var(--primary-color);
}

.research-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: var(--secondary-color);
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.research-links .github-link {
    display: inline-block;
    color: var(--accent-color);
    text-decoration: none;
    font-size: 1.2em;
    font-weight: 600;
    margin-top: 20px;
    transition: transform 0.3s ease;
}

.research-links .github-link:hover {
    transform: scale(1.05);
}

/* Contact Section */
.contact {
    background: var(--secondary-color);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

#contactForm {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#contactForm input,
#contactForm textarea {
    width: 100%;
    padding: 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--light-text);
    font-family: inherit;
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

#contactForm input:focus,
#contactForm textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.15);
}

#contactForm button {
    background: var(--accent-color);
    color: var(--primary-color);
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
}

#contactForm button:hover {
    background: #5fa5ff;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.4);
}

.message-status {
    margin-top: 20px;
    font-weight: 600;
}

/* Footer */
.site-footer {
    padding: 20px;
    text-align: center;
    background: var(--primary-color);
    border-top: 1px solid var(--secondary-color);
    font-size: 0.9em;
}

/* Responsive Design */
@media (max-width: 768px) {
    #main-header {
        padding: 15px 20px;
        justify-content: center;
    }
    nav {
        display: none;
    }
    .logo {
        font-size: 1.2em;
    }
    .section {
        padding: 60px 20px;
    }
    h1 {
        font-size: 2.5em;
    }
    h2 {
        font-size: 2em;
    }
    .buttons button {
        margin: 10px 5px;
        padding: 12px 20px;
    }
    .about {
        flex-direction: column;
    }
    .about-content {
        text-align: center;
    }
}

/* Fade-in Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 1s ease-out; }
.fade-in-up { animation: fadeInUp 1s ease-out; }
.fade-in-up-delay { animation: fadeInUp 1s ease-out 0.5s forwards; opacity: 0; }