/* ============================================
   RETRO MINIMALIST PORTFOLIO
   Black background, white text, green accents
   Professional & Clean Design
   ============================================ */

/* CSS Variables */
:root {
    /* Colors */
    --bg-color: #000000;
    --text-color: #ffffff;
    --text-muted: #a0a0a0;
    --accent-color: #00ff41;
    --accent-hover: #00cc33;
    --card-bg: #0a0a0a;
    --border-color: rgba(255, 255, 255, 0.12);

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --container-width: 900px;
    --section-padding: 50px 0;
}

/* Light Theme */
[data-theme="light"] {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --text-muted: #666666;
    --accent-color: #00aa33;
    --accent-hover: #008822;
    --card-bg: #f8f8f8;
    --border-color: rgba(0, 0, 0, 0.1);
}

/* ============================================
   BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 15px;
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: all 0.2s ease;
}

a:hover {
    opacity: 0.85;
}

strong {
    font-weight: 600;
}

/* ============================================
   TOP SOCIAL BAR
   ============================================ */
.top-social-bar {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1001;
}

.social-links-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.social-links-top a {
    color: var(--text-muted);
    font-size: 1rem;
    transition: color 0.2s ease;
}

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

.social-links-top .cv-link {
    color: var(--accent-color);
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 4px 12px;
    border: 1px solid var(--accent-color);
    border-radius: 3px;
}

.social-links-top .cv-link:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 44px;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 12px 0;
}

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

.logo {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.logo:hover {
    color: var(--text-color);
}

.nav-links {
    display: flex;
    gap: 25px;
    align-items: center;
}

.nav-link {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 400;
    padding: 5px 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-color);
    transition: width 0.2s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-color);
}

.theme-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 5px;
    transition: color 0.2s;
}

.theme-btn:hover {
    color: var(--accent-color);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--text-color);
    transition: all 0.3s ease;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 100px;
    left: 0;
    right: 0;
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 20px;
    flex-direction: column;
    gap: 15px;
    z-index: 999;
}

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

.mobile-link {
    color: var(--text-color);
    font-size: 1rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: flex;
    }
    .social-links-top {
        gap: 15px;
    }
    .social-links-top .cv-link {
        padding: 3px 8px;
        font-size: 0.8rem;
    }
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: var(--section-padding);
}

.section + .section {
    border-top: 1px solid var(--border-color);
}

#about {
    padding-top: 140px;
}

h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 5px;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 5px;
}

h4 {
    font-size: 0.95rem;
    font-weight: 500;
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 30px;
}

.subsection-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 20px;
    color: var(--text-color);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero-content {
    text-align: center;
    margin-bottom: 30px;
}

.hero-subtitle {
    color: var(--accent-color);
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-location {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 8px;
}

.hero-location i {
    margin-right: 5px;
    color: var(--accent-color);
}

.hero-tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 5px;
}

/* ============================================
   PHOTO TIMELINE
   ============================================ */
.photo-timeline {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    margin: 35px 0;
    flex-wrap: wrap;
}

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

.photo-item img {
    max-width: 220px;
    max-height: 280px;
    object-fit: cover;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    filter: grayscale(15%);
}

.photo-item img:hover {
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
    filter: grayscale(0%);
}

.photo-label {
    display: block;
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.timeline-arrow {
    font-size: 1.3rem;
    color: var(--accent-color);
    opacity: 0.7;
}

@media (max-width: 600px) {
    .photo-timeline {
        flex-direction: column;
    }
    .timeline-arrow {
        transform: rotate(90deg);
    }
}

/* ============================================
   ABOUT CONTENT
   ============================================ */
.about-content {
    margin-top: 40px;
}

.about-content > p {
    color: var(--text-muted);
    margin-bottom: 15px;
    line-height: 1.7;
}

.about-content h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--text-color);
}

/* Skills Section */
.skills-section {
    display: grid;
    gap: 20px;
    margin-top: 15px;
}

.skill-group h4 {
    color: var(--accent-color);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tags span {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 5px 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: all 0.2s ease;
}

.skill-tags span:hover {
    border-color: var(--accent-color);
    color: var(--text-color);
}

/* Certifications */
.cert-list {
    list-style: none;
    margin-top: 10px;
}

.cert-list li {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.cert-list li:last-child {
    border-bottom: none;
}

.cert-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

/* ============================================
   EXPERIENCE TIMELINE
   ============================================ */
.timeline {
    position: relative;
    padding-left: 25px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: linear-gradient(to bottom, var(--accent-color), var(--border-color));
}

.timeline-item {
    position: relative;
    margin-bottom: 30px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -29px;
    top: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-color);
}

.timeline-item.featured .timeline-marker {
    width: 10px;
    height: 10px;
    left: -30px;
    box-shadow: 0 0 8px var(--accent-color);
}

.timeline-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 18px;
}

.timeline-item.featured .timeline-content {
    border-color: rgba(0, 255, 65, 0.3);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 5px;
}

.company {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 400;
}

.badge {
    display: inline-block;
    background-color: rgba(0, 255, 65, 0.1);
    color: var(--accent-color);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 3px;
    margin-left: 8px;
    font-weight: 500;
}

.date {
    color: var(--accent-color);
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

.location {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 10px;
}

.location i {
    margin-right: 5px;
    font-size: 0.75rem;
}

.role-description {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 10px;
    font-style: italic;
}

.timeline-content ul {
    list-style: none;
    margin-top: 8px;
}

.timeline-content li {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 6px;
    padding-left: 15px;
    position: relative;
    line-height: 1.5;
}

.timeline-content li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.project-links {
    margin-top: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.project-links a {
    color: var(--accent-color);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.project-links a:hover {
    text-decoration: underline;
}

/* ============================================
   EDUCATION
   ============================================ */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.edu-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 18px;
}

.edu-card h4 {
    color: var(--text-color);
    margin-bottom: 5px;
}

.edu-card .school {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.edu-card .edu-date {
    color: var(--accent-color);
    font-size: 0.8rem;
    display: block;
    margin-top: 8px;
}

.edu-card .gpa {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 5px;
}

/* ============================================
   PROJECTS GRID
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
    gap: 15px;
}

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    transition: all 0.2s ease;
    display: block;
    color: var(--text-color);
}

.project-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.project-card.featured-project {
    border-color: rgba(0, 255, 65, 0.3);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.project-header i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.project-type {
    font-size: 0.7rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.project-card h3 {
    margin-bottom: 8px;
    font-size: 1rem;
}

.project-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 12px;
    line-height: 1.5;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tech-stack span {
    font-size: 0.7rem;
    color: var(--accent-color);
    background-color: rgba(0, 255, 65, 0.08);
    padding: 3px 8px;
}

.view-link {
    color: var(--accent-color);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* ============================================
   PUBLICATIONS
   ============================================ */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.publication-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 18px;
}

.pub-status {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 3px 10px;
    margin-bottom: 10px;
    font-weight: 500;
}

.pub-status.published {
    background-color: rgba(0, 255, 65, 0.1);
    color: var(--accent-color);
}

.pub-status.review {
    background-color: rgba(255, 193, 7, 0.1);
    color: #ffc107;
}

.pub-status.preparing {
    background-color: rgba(100, 100, 100, 0.2);
    color: var(--text-muted);
}

.publication-item h4 {
    color: var(--text-color);
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 8px;
}

.pub-authors {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.pub-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 10px;
    font-size: 0.85rem;
}

/* ============================================
   AWARDS
   ============================================ */
.awards-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.award-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 15px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
}

.award-item i {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-top: 2px;
}

.award-item h4 {
    color: var(--text-color);
    margin-bottom: 3px;
}

.award-item p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 25px 0;
    text-align: center;
    margin-top: 30px;
}

.footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-color);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* ============================================
   SELECTION
   ============================================ */
::selection {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 600px) {
    :root {
        --section-padding: 40px 0;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.2rem;
    }

    .timeline {
        padding-left: 20px;
    }

    .timeline-marker {
        left: -24px;
    }

    .timeline-content {
        padding: 15px;
    }

    .project-card {
        padding: 15px;
    }

    .photo-item img {
        max-width: 180px;
        max-height: 220px;
    }
}