:root {
    --bg-color: #0f172a;
    --bg-alt: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.3);
    --card-bg: #1e293b;
    --card-hover: #334155;
    --nav-bg: rgba(15, 23, 42, 0.9);

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;

    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    color: var(--text-primary);
    line-height: 1.2;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    text-align: center;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    font-weight: 500;
    font-size: 1rem;
    color: var(--text-secondary);
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    /* nav height */
    position: relative;
    background: linear-gradient(rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.8)), url('hero-bg.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: var(--spacing-lg);
    width: 100%;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.designation {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.description {
    font-size: 1.1rem;
    max-width: 500px;
    margin-bottom: var(--spacing-lg);
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-color);
    margin-right: var(--spacing-sm);
}

.btn-primary:hover {
    background: #0ea5e9;
    /* slightly darker sky blue */
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-glow);
}

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

.btn-secondary:hover {
    background: rgba(56, 189, 248, 0.1);
    transform: translateY(-2px);
}

/* Hero Visual */
.circle-graphic {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle at 30% 30%, var(--accent), transparent 60%);
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: pulse 6s infinite alternate;
}

@keyframes pulse {
    0% {
        transform: scale(0.8);
        opacity: 0.3;
    }

    100% {
        transform: scale(1.1);
        opacity: 0.5;
    }
}

/* Sections */
.section {
    padding: var(--spacing-xl) 0;
}

.bg-alt {
    background-color: var(--bg-alt);
}

/* About */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.personal-details {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.detail-item {
    background: var(--card-bg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.detail-item .label {
    color: var(--accent);
    font-weight: 600;
    margin-right: 8px;
}

/* Stats Section */
.stats-container {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin: var(--spacing-md) 0;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Services */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.service-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    text-align: center;
}

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

.service-icon {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: var(--spacing-sm);
}

.service-card h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.service-card p {
    font-size: 0.95rem;
}

/* Timeline/Experience */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 30px;
    border-left: 2px solid var(--card-hover);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.timeline-dot {
    position: absolute;
    left: -37px;
    top: 0;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    border: 4px solid var(--bg-alt);
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.timeline-content {
    background: var(--bg-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(10px);
    border-color: var(--accent);
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.skill-category h3 {
    color: var(--accent);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.tag {
    padding: 8px 16px;
    background: var(--card-bg);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.tag:hover {
    background: var(--accent);
    color: var(--bg-color);
    transform: scale(1.05);
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.project-archive {
    margin-top: var(--spacing-xl);
}

.archive-title {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.archive-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.archive-item {
    background: rgba(30, 41, 59, 0.5);
    padding: 10px 15px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    text-align: center;
}

.archive-item:hover {
    background: var(--card-bg);
    color: var(--accent);
    border-color: var(--accent);
}


.project-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    height: 100%;
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    position: relative;
    padding: var(--spacing-md);
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.project-info h3 {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-xs);
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.tech-stack {
    font-size: 0.9rem;
    color: var(--accent);
    font-weight: 500;
}

.experience-list {
    margin-top: var(--spacing-sm);
    text-align: left;
    list-style-type: disc;
    padding-left: 20px;
}

.experience-list li {
    color: var(--text-secondary);
    margin-bottom: 5px;
}

/* Education */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.edu-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

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

/* Contact */
.contact-section {
    text-align: center;
}

.contact-content {
    margin-top: var(--spacing-lg);
}

.contact-cards {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.contact-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 25px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.contact-card i {
    color: var(--accent);
}

.footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
        /* simple generic hiding for now, would need JS toggle for full mobile menu */
    }

    .hamburger {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        order: 2;
        /* Visual below text on mobile if desired, or keep as is. */
    }

    .circle-graphic {
        margin: 0 auto;
        width: 280px;
        height: 280px;
    }

    .section {
        padding: var(--spacing-lg) 0;
    }
}