/* Professional Premium Dark Theme */
:root {
    --bg-color: #0B0F19; /* Deep matte slate/black */
    --card-bg: #141A28; /* Slightly lighter for cards */
    --card-border: rgba(255, 255, 255, 0.08);
    --text-primary: #F1F5F9; /* Very light slate */
    --text-secondary: #94A3B8; /* Muted slate */
    --accent-color: #38BDF8; /* Sky blue professional accent */
    --accent-hover: #0EA5E9;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition: all 0.25s ease-in-out;
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 10px 30px rgba(0, 0, 0, 0.6);
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

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

.section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 2.5rem;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 0.5rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* Common Components */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    box-shadow: var(--shadow-soft);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(56, 189, 248, 0.3); /* Subtle accent border on hover */
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #0B0F19; /* High contrast text */
    border: 1px solid var(--accent-color);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--text-secondary);
}

/* Navbar */
.header {
    background: rgba(11, 15, 25, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--card-border);
    padding: 1.2rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: var(--transition);
}

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

.nav-btn {
    border: 1px solid var(--card-border);
    padding: 0.4rem 1rem;
    border-radius: 6px;
}

.nav-btn:hover {
    border-color: var(--accent-color) !important;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6rem 0;
    gap: 4rem;
}

.hero-content {
    flex: 1.2;
}

.name-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--accent-color);
    margin-bottom: 2rem;
    font-weight: 500;
}

.bio {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.socials {
    display: flex;
    gap: 1rem;
}

.hero-image {
    flex: 0.8;
    display: flex;
    justify-content: flex-end;
}

.hero-image img {
    width: 320px;
    height: 320px;
    object-fit: cover;
    border-radius: 50%;
    border: 2px solid var(--card-border);
    box-shadow: var(--shadow-hover);
}

/* Timeline Cards (Education & Experience) */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.timeline-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

.timeline-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timeline-card .date {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background-color: rgba(255, 255, 255, 0.05);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

.timeline-card .role {
    font-size: 1.05rem;
    color: var(--accent-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.timeline-card .details {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.timeline-card .highlight {
    font-weight: 500;
    color: var(--text-primary);
}

.task-list {
    padding-left: 1.2rem;
    color: var(--text-secondary);
}

.task-list li {
    margin-bottom: 0.4rem;
}

.task-list strong {
    color: var(--text-primary);
}

/* Projects Grid */
.grid {
    display: grid;
    gap: 1.5rem;
}

.projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.project-card {
    display: flex;
    flex-direction: column;
}

.project-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.project-card .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-card .tags span {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-card p {
    color: var(--text-secondary);
    flex-grow: 1;
}

/* Achievements Grid */
.cert-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.cert-card {
    text-align: center;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cert-card .img-wrapper {
    background-color: white;
    width: 100%;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 140px;
}

.cert-card img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.cert-card h4 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* Footer */
footer {
    padding: 3rem 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--card-border);
    margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        flex-direction: column-reverse;
        text-align: center;
        padding: 4rem 0;
        gap: 2.5rem;
    }
    
    .hero-image {
        justify-content: center;
    }
    
    .socials {
        justify-content: center;
    }
    
    .nav-links {
        display: none;
    }
    
    .timeline-card .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}