/* Variables */
:root {
    /* Dark theme colors */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --accent-primary: #64ffda;
    --accent-secondary: #7f5af0;
    --error: #ff6b6b;
    --success: #51cf66;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;

    /* Border radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 2rem;
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* Container */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: var(--spacing-md) 0;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    margin-left: var(--spacing-lg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin-left: var(--spacing-lg);
}

.nav-toggle {
    display: none;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-secondary);
}

.hero-content {
    max-width: 800px;
}

.tagline {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-lg);
}

/* About Section */
.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.profile-img {
    width: 100%;
    border-radius: var(--border-radius-lg);
}

.about-text {
    text-align: justify !important;
    text-justify: inter-word;
}

/* Skills */
.skill-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.skill {
    background-color: var(--bg-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
}

.progress-bar {
    height: 8px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    margin-top: var(--spacing-xs);
}

.progress {
    height: 100%;
    background-color: var(--accent-primary);
    transition: width var(--transition-slow);
}

/* Career Grid */
.career-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.career-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    transition: transform var(--transition-fast);
}

.career-card:hover {
    transform: translateY(-5px);
}

.company-logo {
    width: 100%;
    height: 120px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.company-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    max-width: 200px;
}

/* Timeline */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

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

.timeline-content {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
}

.timeline-content p {
    text-align: justify !important;
    text-justify: inter-word;
}

.timeline-content h3 {
    margin-top: var(--spacing-lg);
}

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

.project-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    transition: transform var(--transition-fast);
}

.project-card:hover {
    transform: translateY(-5px);
}

.tech-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(100, 255, 218, 0.1);
    color: var(--accent-primary);
    border-radius: var(--border-radius-sm);
    margin-right: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

/* Publications Table */
.publications-table {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

th {
    background-color: var(--bg-secondary);
    font-weight: 600;
}

/* Achievements Grid */
.achievements-grid {
    display: grid;
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

/* Main page achievements (single row) */
#achievements .achievements-grid {
    grid-template-columns: repeat(3, 1fr);
}

/* Career page achievements (two columns) */
#career-achievements .achievements-grid {
    grid-template-columns: repeat(2, 1fr);
}

.achievement-icon {
    font-size: 2rem;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.achievement-icon .category {
    font-size: 1rem;
    color: var(--text-secondary);
}

.achievement-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    transition: transform var(--transition-fast);
    height: 100%;
}

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

.achievement-card p {
    text-align: justify;
    line-height: 1.6;
}

/* Certificates Grid */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.certificate-card {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    transition: transform var(--transition-fast);
}

.certificate-card:hover {
    transform: translateY(-5px);
}

/* Contact Section */
.contact-content.centered {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    text-align: center;
}

.contact-info {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    gap: 3rem;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem 3rem;
    background-color: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-size: 1.5rem;
}

.contact-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    background-color: var(--accent-primary);
    color: var(--bg-primary);
}

.contact-icon {
    font-size: 2rem;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

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

    h2 {
        font-size: 2rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-secondary);
        padding: var(--spacing-md);
        flex-direction: column;
        align-items: center;
    }

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

    .nav-toggle {
        display: block;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .contact-item {
        flex-direction: column;
        gap: 1rem;
    }

    .contact-link {
        width: 100%;
        justify-content: center;
    }

    #achievements .achievements-grid,
    #career-achievements .achievements-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        width: 95%;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }
}

.responsibilities ul {
    padding-left: var(--spacing-lg);
}

.technologies-used ul {
    padding-left: var(--spacing-lg);
}

.technologies-used h4 {
    margin-top: var(--spacing-lg);
}