/* =========================================================
   DESIGN SYSTEM
   ========================================================= */
@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;1,400&family=DM+Mono:wght@400;500&display=swap');

:root {
    --bg:            #0D1117;
    --bg-card:       #161B22;
    --bg-card-hover: #1C2128;
    --bg-code:       #1F2937;
    --border:        rgba(48, 54, 61, 0.9);
    --border-subtle: rgba(48, 54, 61, 0.5);

    --text:          #E6EDF3;
    --text-muted:    #8B949E;
    --text-faint:    #484F58;

    --accent:        #3B82F6;
    --accent-dark:   #2563EB;
    --accent-2:      #22D3EE;
    --accent-warm:   #F59E0B;
    --accent-green:  #34D399;

    --gradient:      linear-gradient(135deg, #3B82F6 0%, #22D3EE 100%);
    --gradient-hero: linear-gradient(160deg, #0D1117 0%, #0F1D35 50%, #0D1117 100%);

    --radius:        14px;
    --radius-sm:     8px;
    --radius-xs:     5px;
    --max-w:         900px;

    --shadow:        0 4px 24px rgba(0, 0, 0, 0.35);
    --shadow-hover:  0 8px 40px rgba(59, 130, 246, 0.2);
    --shadow-card:   0 1px 0 rgba(255,255,255,0.04) inset, 0 4px 16px rgba(0,0,0,0.3);

    --nav-h:         64px;
    --transition:    0.25s ease;

    --font-display:  'Syne', sans-serif;
    --font-body:     'Plus Jakarta Sans', sans-serif;
    --font-mono:     'DM Mono', monospace;
}

[data-theme="light"] {
    --bg:            #F6F8FA;
    --bg-card:       #FFFFFF;
    --bg-card-hover: #F0F4F8;
    --bg-code:       #EFF2F5;
    --border:        rgba(208, 215, 222, 0.9);
    --border-subtle: rgba(208, 215, 222, 0.5);

    --text:          #1F2328;
    --text-muted:    #57606A;
    --text-faint:    #B0B8C1;

    --accent:        #0969DA;
    --accent-dark:   #0550AE;
    --accent-2:      #0891B2;
    --accent-warm:   #D97706;
    --accent-green:  #059669;

    --gradient:      linear-gradient(135deg, #0969DA 0%, #0891B2 100%);
    --gradient-hero: linear-gradient(160deg, #0F2952 0%, #0A3A7A 50%, #0F2952 100%);

    --shadow:        0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover:  0 8px 32px rgba(9, 105, 218, 0.15);
    --shadow-card:   0 1px 0 rgba(255,255,255,0.9) inset, 0 2px 8px rgba(0,0,0,0.08);
}

/* =========================================================
   LANGUAGE VISIBILITY
   ========================================================= */
[data-lang="sr"] .lang-en { display: none !important; }
[data-lang="en"] .lang-sr { display: none !important; }

/* =========================================================
   RESET & BASE
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    transition: background var(--transition), color var(--transition);
    overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-2); }

ul { list-style: none; }

/* =========================================================
   NAVIGATION
   ========================================================= */
#navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--nav-h);
    background: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    transition: background var(--transition), border-color var(--transition);
}

[data-theme="light"] #navbar {
    background: rgba(246, 248, 250, 0.85);
}

.nav-logo {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.15rem;
    color: var(--text) !important;
    letter-spacing: -0.02em;
}

.nav-logo span {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 4px;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-xs);
    transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
    color: var(--text);
    background: var(--bg-card);
}

.nav-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.btn-nav {
    background: var(--bg-card);
    color: var(--text-muted);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xs);
    padding: 6px 12px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1;
}

.btn-nav:hover {
    color: var(--text);
    border-color: var(--accent);
    background: var(--bg-card-hover);
}

#theme-toggle {
    width: 36px; height: 36px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.9rem;
}

/* =========================================================
   LAYOUT
   ========================================================= */
.page-wrap {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

section, #header-section {
    padding: 64px 0;
}

.section-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 12px;
    display: block;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 32px;
    letter-spacing: -0.02em;
}

.divider {
    height: 1px;
    background: var(--border-subtle);
    width: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
}

/* =========================================================
   HERO
   ========================================================= */
#hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
    padding-top: var(--nav-h);
}

#hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 70% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 70%),
        radial-gradient(ellipse 40% 40% at 20% 70%, rgba(34, 211, 238, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

/* Subtle grid texture */
#hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 56px;
    padding: 80px 0;
}

.hero-photo-wrap {
    flex-shrink: 0;
    position: relative;
}

.hero-photo-wrap::before {
    content: '';
    position: absolute;
    inset: -4px;
    background: var(--gradient);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.7;
    filter: blur(1px);
}

.hero-photo-wrap::after {
    content: '';
    position: absolute;
    inset: -16px;
    background: radial-gradient(ellipse, rgba(59, 130, 246, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -2;
}

.hero-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    border: 3px solid rgba(255,255,255,0.1);
}

.hero-content {
    flex: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(59, 130, 246, 0.12);
    border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--accent-2);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 500;
    padding: 5px 12px;
    border-radius: 20px;
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}

.hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 800;
    color: #FFFFFF;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin-bottom: 8px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 500;
    color: rgba(255,255,255,0.55);
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

.hero-tagline {
    font-size: 0.95rem;
    color: rgba(255,255,255,0.45);
    max-width: 440px;
    line-height: 1.7;
    margin-bottom: 32px;
    font-weight: 300;
}

.hero-ctas {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    background: var(--gradient);
    color: #fff !important;
    font-weight: 600;
    font-size: 0.87rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-body);
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
    text-decoration: none !important;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(59, 130, 246, 0.45);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    background: transparent;
    color: rgba(255,255,255,0.7) !important;
    font-weight: 500;
    font-size: 0.87rem;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255,255,255,0.2);
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-body);
    text-decoration: none !important;
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.4);
    color: #fff !important;
    transform: translateY(-2px);
}

/* =========================================================
   CAREER OBJECTIVE
   ========================================================= */
.objective-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    padding: 32px 36px;
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}

.objective-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient);
    border-radius: var(--radius) var(--radius) 0 0;
}

.objective-text {
    color: var(--text-muted);
    font-size: 0.97rem;
    line-height: 1.75;
    font-weight: 400;
}

.objective-text strong {
    color: var(--text);
    font-weight: 600;
}

/* =========================================================
   SKILLS
   ========================================================= */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.skill-group {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-card);
    transition: border-color var(--transition), transform var(--transition);
}

.skill-group:hover {
    border-color: var(--border);
    transform: translateY(-2px);
}

.skill-group-label {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-faint);
    margin-bottom: 14px;
    display: block;
}

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

.tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 500;
    background: var(--bg-code);
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    transition: all var(--transition);
}

.tag:hover {
    color: var(--accent);
    border-color: rgba(59, 130, 246, 0.4);
    background: rgba(59, 130, 246, 0.06);
}

.tag.highlight {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--accent);
}

.skill-note {
    display: block;
    font-size: 0.78rem;
    color: var(--text-faint);
    margin-top: 10px;
    font-style: italic;
}

/* =========================================================
   PROJECTS
   ========================================================= */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-card);
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    border-radius: var(--radius) 0 0 var(--radius);
    background: var(--gradient);
    opacity: 0;
    transition: opacity var(--transition);
}

.project-card:hover {
    border-color: var(--border);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.project-card:hover::before { opacity: 1; }

.project-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.project-title {
    font-family: var(--font-display);
    font-size: 0.97rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.project-title a {
    color: var(--text);
    text-decoration: none;
    transition: color var(--transition);
}

.project-title a:hover { color: var(--accent); }

.project-gh-icon {
    color: var(--text-faint);
    font-size: 0.95rem;
    flex-shrink: 0;
    margin-top: 2px;
    transition: color var(--transition);
    text-decoration: none;
}

.project-card:hover .project-gh-icon { color: var(--text-muted); }

.project-desc {
    color: var(--text-muted);
    font-size: 0.83rem;
    line-height: 1.65;
    flex: 1;
    margin-bottom: 16px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 500;
    padding: 3px 9px;
    border-radius: var(--radius-xs);
    background: var(--bg-code);
    border: 1px solid var(--border-subtle);
    color: var(--text-faint);
}

/* =========================================================
   EDUCATION
   ========================================================= */
.timeline {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px; top: 24px; bottom: 24px;
    width: 1px;
    background: var(--border);
}

.timeline-item {
    display: flex;
    gap: 24px;
    padding-bottom: 40px;
    position: relative;
}

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

.timeline-dot {
    flex-shrink: 0;
    width: 30px; height: 30px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    position: relative;
    z-index: 1;
    box-shadow: 0 0 0 4px var(--bg);
}

.timeline-body { flex: 1; padding-top: 3px; }

.timeline-year {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 4px;
    letter-spacing: 0.08em;
}

.timeline-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
    letter-spacing: -0.01em;
}

.timeline-title a {
    color: var(--text);
    text-decoration: none;
    transition: color var(--transition);
}

.timeline-title a:hover { color: var(--accent); }

.timeline-sub {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.timeline-note {
    font-size: 0.8rem;
    color: var(--accent-2);
    font-weight: 500;
}

/* =========================================================
   LANGUAGES & MISC
   ========================================================= */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-card);
}

.lang-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lang-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.87rem;
}

.lang-name { color: var(--text); font-weight: 500; }
.lang-level { color: var(--text-muted); font-size: 0.8rem; }

/* =========================================================
   LOOKING FOR - CTA
   ========================================================= */
.cta-section {
    background: var(--bg-card);
    border: 1px solid rgba(59, 130, 246, 0.25);
    border-radius: var(--radius);
    padding: 36px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 40px rgba(59, 130, 246, 0.06);
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 80% at 50% 0%, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

.cta-text {
    font-size: 0.92rem;
    color: var(--text-muted);
    max-width: 480px;
    margin: 0 auto 28px;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* =========================================================
   FOOTER
   ========================================================= */
footer {
    border-top: 1px solid var(--border-subtle);
    padding: 32px 24px;
    text-align: center;
    color: var(--text-faint);
    font-size: 0.8rem;
    font-family: var(--font-mono);
    letter-spacing: 0.02em;
}

footer a {
    color: var(--text-faint);
    transition: color var(--transition);
}

footer a:hover { color: var(--text-muted); }

/* =========================================================
   RELEVANT COURSES
   ========================================================= */
.courses-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.course-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-card);
    transition: all var(--transition);
}

.course-item:hover {
    border-color: var(--border);
    transform: translateX(4px);
}

.course-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.course-info { flex: 1; }
.course-title {
    font-weight: 600;
    font-size: 0.87rem;
    color: var(--text);
    margin-bottom: 2px;
}
.course-sub {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.course-item a {
    color: inherit;
    text-decoration: none;
}

/* =========================================================
   INTERNSHIP HIGHLIGHT
   ========================================================= */
.internship-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.3);
    color: var(--accent-green);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 20px;
    margin-bottom: 20px;
}

/* =========================================================
   ANIMATIONS
   ========================================================= */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.hero-content > * {
    animation: fadeUp 0.6s ease both;
}

.hero-badge        { animation-delay: 0.1s; }
.hero-name         { animation-delay: 0.2s; }
.hero-title        { animation-delay: 0.3s; }
.hero-tagline      { animation-delay: 0.4s; }
.hero-ctas         { animation-delay: 0.5s; }
.hero-photo-wrap   { animation: fadeUp 0.6s ease 0.1s both; }

/* =========================================================
   PRINT
   ========================================================= */
@media print {
    #navbar, .no-print, .hero-ctas { display: none !important; }
    #hero {
        min-height: auto;
        padding: 40px 0 20px;
        background: none !important;
    }
    body { background: #fff; color: #000; font-size: 12px; }
    .hero-name, .section-title { color: #000; }
    a { color: #000; text-decoration: none; }
    .projects-grid, .skills-grid, .two-col { grid-template-columns: 1fr 1fr; }
    * { box-shadow: none !important; }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 700px) {
    #navbar { padding: 0 16px; }
    .nav-links { display: none; }
    .hero-inner { flex-direction: column; text-align: center; gap: 32px; }
    .hero-ctas { justify-content: center; }
    .hero-tagline { margin: 0 auto 32px; }
    .skills-grid, .projects-grid, .two-col { grid-template-columns: 1fr; }
    .page-wrap { padding: 0 16px; }
    section { padding: 48px 0; }
    .objective-card { padding: 24px; }
    .cta-section { padding: 28px 20px; }
}