:root {
    /* Dark Theme Colors based on Image */
    --bg-main: #0b111e;
    --bg-secondary: #121927;
    --text-main: #ffffff;
    --text-muted: #9ba4b5;
    --accent: #00bfff; /* Cyan */
    --accent-hover: #0099cc;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, .logo {
    font-family: 'Poppins', sans-serif;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Navigation */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 8%;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: 100;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-main);
}

.logo::after {
    content: '.';
    color: var(--accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-main);
    transition: color 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--accent);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 0 0 8%;
    position: relative;
    overflow: hidden;
}

.hero-left {
    flex: 1;
    max-width: 650px;
    z-index: 10;
    position: relative;
    padding-top: 5rem;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    line-height: 1.1;
    color: var(--text-main);
}

.hero h2 {
    font-size: 2.2rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.summary {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    line-height: 1.8;
    max-width: 550px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 5rem;
}

.btn {
    padding: 0.9rem 2.2rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
}

.btn.primary {
    background: var(--accent);
    color: var(--bg-main);
    border: 2px solid var(--accent);
}

.btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn.outline {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn.outline:hover {
    background: rgba(0, 191, 255, 0.1);
}

/* Social Footer in Hero */
.social-footer {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    position: absolute;
    bottom: 2rem;
    width: 150%;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 1.1rem;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.social-icon:hover {
    background: var(--accent);
    color: var(--bg-main);
}

.social-line {
    height: 1px;
    background: rgba(255,255,255,0.2);
    width: 100%;
}

/* Hero Right Image */
.hero-right {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 55%;
    z-index: 1;
}

.image-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
}

.hero-right img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    opacity: 0.7;
}

/* Gradient overlay to blend image into the dark background */
.image-gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, var(--bg-main) 0%, rgba(11, 17, 30, 0.5) 40%, transparent 100%),
                linear-gradient(to top, var(--bg-main) 0%, transparent 20%);
}

/* Sections */
.section {
    padding: 6rem 8%;
    background-color: var(--bg-main);
}

.section:nth-child(even) {
    background-color: var(--bg-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-main);
}

.section-title::after {
    content: '.';
    color: var(--accent);
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 2.5rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.section:nth-child(even) .card {
    background: var(--bg-main);
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 191, 255, 0.3);
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 900px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    height: 100%;
    width: 2px;
    background: rgba(255, 255, 255, 0.1);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 2rem;
}

.timeline-dot {
    position: absolute;
    left: 14px;
    top: 30px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    z-index: 1;
}

.timeline-content h3 {
    font-size: 1.4rem;
    color: var(--text-main);
    margin-bottom: 0.3rem;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--accent);
    margin-bottom: 1rem;
    font-weight: 600;
}

.timeline-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.card .year {
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tags span {
    background: rgba(0, 191, 255, 0.1);
    color: var(--accent);
    padding: 0.3rem 0.8rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Skills */
.skills-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.skill-group h3 {
    color: var(--text-main);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.skill-group h3 i {
    color: var(--accent);
}

.skill-group p {
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.8;
}

/* Certifications */
.full-width {
    grid-column: 1 / -1;
}

.cert-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.cert-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.cert-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.cert-list li {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.cert-list li i {
    color: var(--accent);
    font-size: 1.2rem;
    margin-top: 0.2rem;
}

.cert-list li div {
    display: flex;
    flex-direction: column;
}

.cert-list li strong {
    color: var(--text-main);
    font-size: 0.95rem;
}

.cert-list li span {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 0.3rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

/* Animations */
.animate-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }

@keyframes fadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 992px) {
    .hero {
        flex-direction: column;
        padding: 8rem 5% 4rem;
        text-align: center;
    }
    .hero-left {
        max-width: 100%;
        padding-top: 0;
        z-index: 10;
    }
    .hero-right {
        position: absolute;
        width: 100%;
        height: 100%;
        opacity: 0.3;
        z-index: 1;
    }
    .image-gradient-overlay {
        background: linear-gradient(to top, var(--bg-main) 0%, rgba(11, 17, 30, 0.7) 100%);
    }
    .hero h1 { font-size: 3.5rem; }
    .hero h2 { font-size: 1.8rem; }
    .summary { margin: 0 auto 2.5rem; }
    .hero-buttons { justify-content: center; }
    .social-footer { position: relative; width: 100%; justify-content: center; margin-top: 3rem; bottom: 0; }
    .social-line { display: none; }
    .skills-container { grid-template-columns: 1fr; }
}


/* --- Light Mode Styles --- */
body.light-mode {
    --bg-main: #f8fafc;
    --bg-secondary: #ffffff;
    --text-main: #0f172a;
    --text-muted: #475569;
}

.theme-toggle-btn {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.3s ease, transform 0.3s ease;
    display: flex;
    align-items: center;
}

.theme-toggle-btn:hover {
    color: var(--accent);
    transform: scale(1.1);
}

body.light-mode .hero-right img {
    opacity: 1;
}

body.light-mode .image-gradient-overlay {
    background: linear-gradient(to right, var(--bg-main) 0%, transparent 20%);
}

body.light-mode .timeline::before {
    background: rgba(0, 0, 0, 0.1);
}

body.light-mode .card {
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
}

body.light-mode footer, body.light-mode .cert-header {
    border-color: rgba(0, 0, 0, 0.05);
}

body.light-mode .social-line {
    background: rgba(0,0,0,0.2);
}

@media (max-width: 992px) {
    body.light-mode .hero-right img {
        opacity: 0.8;
    }
    body.light-mode .image-gradient-overlay {
        background: linear-gradient(to top, var(--bg-main) 0%, transparent 30%);
    }
}


/* Card Links (Titles and Certs) */
.card-link {
    color: var(--text-main);
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
    transition: color 0.3s ease;
}

.card-link:hover {
    color: var(--accent);
}