:root {
    --bg-navy: #0a192f;
    --bg-light-navy: #112240;
    --bg-lightest-navy: #233554;
    --text-slate: #8892b0;
    --text-light-slate: #a8b2d1;
    --text-white: #e6f1ff;
    --accent-cyan: #64ffda;
    --accent-blue: #50e3c2;
    
    --font-mono: 'Fira Code', monospace;
    --font-sans: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-navy);
    color: var(--text-slate);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Optimization: Font Display Swap */
@font-face {
    font-family: 'Fira Code';
    font-display: swap;
}
@font-face {
    font-family: 'Inter';
    font-display: swap;
}

/* Typography Utilities */
h1, h2, h3, h4 {
    color: var(--text-white);
    font-weight: 600;
}

.mono-accent {
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    font-size: 0.9rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* Navigation */
.navbar {
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    background-color: rgba(10, 25, 47, 0.85);
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    font-size: 1.2rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-light-slate);
}

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

.btn-resume {
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan) !important;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.btn-resume:hover {
    background-color: rgba(100, 255, 218, 0.1);
}

/* Hamburger */
.hamburger {
    display: none;
    cursor: pointer;
}
.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--accent-cyan);
}

/* Hero Section */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-layout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.hero-text-content {
    flex: 1.5;
}

.hero-image-container {
    flex: 1;
    display: flex;
    justify-content: center;
}

.image-wrapper {
    position: relative;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background-color: var(--accent-cyan);
}

.profile-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    position: relative;
    z-index: 2;
    filter: grayscale(100%) contrast(1.2);
    transition: filter 0.3s ease;
    border: 2px solid var(--bg-navy);
}

.image-wrapper:hover .profile-img {
    filter: none;
}

.image-wrapper::after {
    content: "";
    position: absolute;
    top: 10px;
    left: 10px;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid var(--accent-cyan);
    z-index: 1;
    transition: transform 0.3s ease;
}

.image-wrapper:hover::after {
    transform: translate(-5px, -5px);
}

#hero h1 {
    font-size: clamp(40px, 8vw, 70px);
    margin-top: 10px;
}

#hero h2 {
    font-size: clamp(30px, 5vw, 50px);
    color: var(--text-slate);
    margin-bottom: 20px;
}

.bio {
    max-width: 600px;
    font-size: 1.1rem;
    margin-bottom: 50px;
}

.hero-cta {
    display: flex;
    gap: 20px;
}

.btn-primary {
    background-color: transparent;
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 15px 30px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: rgba(100, 255, 218, 0.1);
}

.btn-outline {
    color: var(--text-light-slate);
    padding: 15px 30px;
    font-family: var(--font-mono);
    border: 1px solid transparent;
}

.btn-outline:hover {
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
    border-radius: 4px;
}

/* Section Titles */
.section-title {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    margin-bottom: 40px;
    color: var(--text-light-slate);
}

.section-title span {
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    font-size: 1.4rem;
    margin-right: 10px;
}

.section-title::after {
    content: "";
    display: block;
    width: 300px;
    height: 1px;
    background-color: #233554;
    margin-left: 20px;
}

/* Skills Grid */
#skills {
    padding: 100px 0;
}

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

.skill-card {
    background-color: var(--bg-light-navy);
    padding: 25px;
    border-radius: 4px;
    transition: transform 0.2s ease;
    border: 1px solid transparent;
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
}

.skill-icon {
    font-size: 2rem;
    color: var(--accent-cyan);
    margin-bottom: 20px;
}

.skill-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-light-slate);
}

.skill-card p {
    font-size: 0.9rem;
    font-family: var(--font-mono);
}

/* Projects Section */
#projects {
    padding: 100px 0;
}

.project-card {
    background-color: var(--bg-light-navy);
    padding: 2rem;
    border-radius: 5px;
    margin-bottom: 30px;
    border: 1px solid #233554;
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
}

.project-card.featured {
    border-left: 4px solid var(--accent-cyan);
}

.project-overline {
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    font-size: 0.8rem;
    margin-bottom: 10px;
}

.project-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-light-slate);
}

.project-desc {
    background-color: var(--bg-navy);
    padding: 20px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.project-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    list-style: none;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    margin-bottom: 20px;
}

.link-highlight {
    color: var(--accent-cyan);
    font-weight: bold;
    border-bottom: 1px dashed var(--accent-cyan);
}

.link-highlight:hover {
    border-bottom-style: solid;
}

/* About Grid */
#about {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 50px;
}

.cert-list {
    list-style: none;
}

.cert-list li {
    margin-bottom: 15px;
}

.cert-list li::before {
    content: "▹";
    color: var(--accent-cyan);
    margin-right: 10px;
}

.cert-link {
    border-bottom: 1px solid transparent;
    transition: all 0.3s;
}

.cert-link:hover {
    color: var(--accent-cyan);
    border-bottom: 1px solid var(--accent-cyan);
}

/* Contact Section */
#contact {
    padding: 100px 0;
    text-align: center;
}

.center-title {
    justify-content: center;
}

.center-title::after {
    display: none;
}

.contact-intro {
    max-width: 600px;
    margin: 0 auto 50px;
    font-size: 1.1rem;
}

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

.contact-form {
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-light-slate);
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-lightest-navy);
    border: 1px solid transparent;
    border-radius: 4px;
    color: var(--text-white);
    font-family: var(--font-sans);
}

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

/* Footer */
footer {
    padding: 20px 0;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background-color: var(--bg-navy);
}

.social-links {
    margin-bottom: 15px;
}

.social-links a {
    font-size: 1.5rem;
    margin: 0 10px;
    color: var(--text-light-slate);
}

.social-links a:hover {
    color: var(--accent-cyan);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 80px;
        right: 0;
        background-color: var(--bg-light-navy);
        width: 100%;
        padding: 20px;
        text-align: center;
        box-shadow: 0 10px 30px -10px rgba(2, 12, 27, 0.7);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    .hero-layout {
        flex-direction: column;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title::after {
        width: 100px;
    }
}