/* --- 1. CSS Variables & Global Setup --- */
:root {
    --primary-color: #007BFF;
    --accent-color: #00BFFF;
    --bg-dark: #0A0A0A;
    --bg-secondary: #111111;
    --text-primary: #EAEAEA;
    --text-secondary: #A0AEC0;
    --border-color: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(20, 20, 20, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    background-image: radial-gradient(circle at 10% 10%, rgba(0, 123, 255, 0.1), transparent 30%),
                      radial-gradient(circle at 90% 80%, rgba(0, 123, 255, 0.1), transparent 30%);
    background-attachment: fixed;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

h1, h2, h3 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; margin-bottom: 3rem; text-align: center; letter-spacing: 1px; }
h3 { font-size: 1.5rem; color: var(--text-primary); }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

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

ul {
    list-style-type: none;
}

section {
    padding: 7rem 0;
}

/* --- 2. Header & Navigation --- */
header {
    background: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1.5rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s ease;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    transition: color 0.3s, border-color 0.3s;
}

nav .logo:hover {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

nav ul {
    display: flex;
    gap: 2.5rem;
}

nav ul li a {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

nav ul li a:hover {
    color: var(--text-primary);
}

nav ul li a:hover::after {
    width: 100%;
}

/* --- 3. Hero Section --- */
#hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 60px;
}

.profile-picture {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 2rem;
    border: 4px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(0, 123, 255, 0.5);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.profile-picture:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(0, 123, 255, 0.7);
}

#hero .subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 1rem auto 2.5rem;
    color: var(--text-secondary);
}

.hero-links {
    display: flex; 
    justify-content: center; 
    align-items: center; 
    flex-wrap: wrap; 
    gap: 1rem; 
}

.hero-links a {
    display: inline-block;
    background: var(--primary-color);
    color: var(--text-primary);
    padding: 0.8rem 1.8rem;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.hero-links a:hover {
    background: var(--accent-color);
    transform: translateY(-3px);
    box-shadow: 0 0 15px rgba(0, 123, 255, 0.5);
}

/* Style for the hamburger menu button */
.hamburger-menu {
    display: none; /* Hidden by default on desktop */
    flex-direction: column;
    justify-content: space-around;
    width: 2rem;
    height: 2rem;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1010; /* Ensure it's on top of other content */
}

.hamburger-menu span {
    width: 2rem;
    height: 0.25rem;
    background-color: var(--text-primary);
    border-radius: 10px;
    transition: all 0.3s linear;
    position: relative;
    transform-origin: 1px;
}

/* Styles for when the menu is active/open (we'll add this class with JS) */
.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(20px);
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg);
}

/* Media Query for Mobile Devices */
@media (max-width: 768px) {
    /* Hide the original navigation links */
    nav ul {
        display: none;
    }
    
    /* Show the hamburger menu button */
    .hamburger-menu {
        display: flex;
    }
    
    /* Style the mobile navigation menu container */
    .nav-links {
        display: none; /* Hidden by default */
        position: absolute;
        top: 100%; /* Position it right below the header */
        right: 0;
        background: rgba(10, 10, 10, 0.9); /* Same as header, but less transparent */
        backdrop-filter: blur(15px);
        -webkit-backdrop-filter: blur(15px);
        width: 100%;
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        align-items: center;
    }

    /* This class will be toggled by JavaScript to show the menu */
    .nav-links.active {
        display: flex;
    }
    
    /* Restyle the list and links for a vertical mobile menu */
    .nav-links ul {
        display: flex;
        flex-direction: column;
        width: 100%;
        text-align: center;
        padding: 1rem 0;
    }

    .nav-links li {
        padding: 1rem 0;
    }

    .nav-links a {
        font-size: 1.2rem;
    }
}

/* --- 4. Reusable Card Component --- */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 123, 255, 0.5);
}

hr.section-divider {
    border: 0;
    height: 0.2px;
    background-color: var(--text-primary); /* Matches your site's border theme */
    max-width: 1100px;
    margin: 0 auto;
}

/* --- 5. Section Specific Styles --- */

#about { 
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    border-top: 1px solid var(--border-color);
}

#about p {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.1rem;
}
#experience { 
    background: var(--bg-secondary); 
    border-bottom: 1px solid var(--border-color);
    border-top: 1px solid var(--border-color);
}

.experience-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}
.experience-grid .card .company {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}
.experience-grid .card ul { padding-left: 0; }
.experience-grid .card ul li {
    padding-left: 20px;
    position: relative;
}
.experience-grid .card ul li::before {
    content: '›';
    color: var(--primary-color);
    position: absolute;
    left: 0;
    top: -2px;
    font-size: 1.5rem;
}
#projects { background: transparent; }
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.project-grid a.card { text-decoration: none; }
.project-grid a.card h3 {
    color: var(--text-primary);
    margin-top: auto;
}
.project-grid a.card p { color: var(--text-secondary); }
.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease;
}
.card:hover .project-image { transform: scale(1.03); }
#skills-education { background: transparent; }
#skills-education .container {
    display: flex;
    gap: 4rem;
    flex-wrap: wrap;
}
#skills-education .column {
    flex: 1;
    min-width: 300px;
}
#skills-education h2 {
    text-align: left;
    margin-bottom: 2rem;
}
.skills-list strong {
    color: var(--text-primary);
    font-weight: 500;
}

/* --- Swiper.js Coverflow Slider Styles --- */
#certifications {
    background: transparent;
}
.swiper-container {
    width: 100%;
    padding-top: 50px;
    padding-bottom: 70px;
    position: relative;
}
.swiper {
    width: 100%;
    padding-top: 50px;
    padding-bottom: 50px;
}
.swiper-slide {
    background-position: center;
    background-size: cover;
    width: 400px;
    max-width: 80vw;
    height: auto;
    max-height: 60vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.5s ease, opacity 0.5s ease;
}
.swiper-slide:not(.swiper-slide-active) {
    opacity: 0.4;
    transform: scale(0.8);
}
.swiper-slide img {
    display: block;
    width: 100%;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    cursor: pointer;
}
.swiper-slide-active {
    opacity: 1;
    transform: scale(1);
}
.swiper-navigation-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 2rem;
    gap: 1.5rem;
}
.swiper-button-next,
.swiper-button-prev {
    position: relative;
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
    width: 44px;
    height: 44px;
    margin: 0;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--text-primary);
    transition: background-color 0.3s ease;
}
.swiper-button-next:hover,
.swiper-button-prev:hover {
    background-color: var(--primary-color);
}
.swiper-button-next:after,
.swiper-button-prev:after {
    font-size: 1.2rem;
    font-weight: 700;
}
.swiper-pagination {
    position: relative;
    bottom: auto;
    width: auto;
}
.swiper-pagination .swiper-pagination-bullet {
    background-color: var(--text-secondary);
    opacity: 0.8;
    width: 10px;
    height: 10px;
    transition: background-color 0.3s ease;
}
.swiper-pagination .swiper-pagination-bullet-active {
    background-color: var(--primary-color);
    opacity: 1;
}


/* --- Lightbox Styles --- */
.lightbox {
    display: none;
    position: fixed;
    z-index: 2000;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.lightbox-content {
    margin: auto;
    display: block;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    object-fit: contain;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    animation-name: zoom;
    animation-duration: 0.6s;
}
@keyframes zoom { from {transform: scale(0.1)} to {transform: scale(1)} }
.close-btn {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
}
.close-btn:hover, .close-btn:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

/* --- Footer --- */
footer {
    background: transparent;
    color: var(--text-secondary);
    text-align: center;
    padding: 6rem 0 2rem;
}
footer .contact-intro {
    max-width: 600px;
    margin: 0 auto 2rem;
}
.contact-info {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}
.contact-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}
.contact-link:hover { color: var(--text-primary); }
.contact-separator { display: none; }
@media (min-width: 480px) { .contact-separator { display: inline; } }
.social-icons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}
.social-icons a {
    color: var(--text-secondary);
    transition: color 0.3s ease, transform 0.3s ease;
}
.social-icons a:hover {
    color: var(--text-primary);
    transform: translateY(-3px);
}
.social-icons a i {
    font-size: 28px;
    transition: color 0.3s ease;
}

.copyright {
    font-size: 0.9rem;
    color: rgba(160, 174, 192, 0.7);
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    h1 { font-size: 2.8rem; }
    h2 { font-size: 2rem; }
    nav ul { display: none; }
    section { padding: 5rem 0; }
    .profile-picture {
        width: 150px;
        height: 150px;
    }
    #skills-education .container {
        flex-direction: column;
        gap: 3rem;
    }
}