/* ========================================
   Design System & CSS Variables
   ======================================== */
:root {
    /* Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(30, 41, 59, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --border-glass: rgba(255, 255, 255, 0.08);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #cbd5e1;
    /* Increased from #64748b for better contrast */

    --accent-cyan: #06b6d4;
    --accent-violet: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-green: #10b981;

    --gradient-primary: linear-gradient(135deg, #06b6d4, #8b5cf6);
    --gradient-secondary: linear-gradient(135deg, #8b5cf6, #ec4899);
    --gradient-glow: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-code: 'Fira Code', 'Cascadia Code', monospace;

    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);

    /* Borders */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 24px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul,
ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

::selection {
    background: rgba(139, 92, 246, 0.3);
    color: var(--text-primary);
}

/* ========================================
   Canvas Background
   ======================================== */
#particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

@media (max-width: 768px) {
    #particles-canvas {
        display: none;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
}

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

.section {
    padding: var(--section-padding);
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    font-family: var(--font-code);
    font-size: 0.9rem;
    color: var(--accent-cyan);
    display: block;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-medium);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-glass);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    transform: translateY(-3px);
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.15);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-medium);
}

.navbar.scrolled {
    padding: 12px 0;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-glass);
}

.nav-container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-code);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -1px;
}

.logo-bracket {
    color: var(--accent-cyan);
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    position: relative;
}

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

.nav-link.active {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    position: relative;
    transition: all var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    transform: rotate(45deg);
    top: 0;
}

.nav-toggle.active .hamburger::after {
    transform: rotate(-45deg);
    top: 0;
}

/* Nav Actions (language toggle + hamburger) */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 50px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-family: var(--font-main);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    letter-spacing: 0.5px;
}

.lang-toggle:hover {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.lang-flag {
    font-size: 1rem;
    line-height: 1;
}

.lang-code {
    text-transform: uppercase;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 5% 80px;
    position: relative;
    z-index: 1;
    gap: 60px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-green);
    margin-bottom: 28px;
    animation: fadeInDown 0.8s ease-out;
}

.pulse-dot {
    font-size: 8px;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.3;
    }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.03em;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-surname {
    display: block;
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    color: var(--text-secondary);
    font-weight: 600;
    margin-top: 4px;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-weight: 500;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.typing-prefix {
    color: var(--text-secondary);
}

.typing-text {
    color: var(--accent-cyan);
    font-weight: 600;
}

.typing-cursor {
    color: var(--accent-cyan);
    animation: blink 1s infinite;
    font-weight: 300;
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

.hero-description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    animation: fadeInUp 0.8s ease-out 0.8s both;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
    animation: fadeInUp 0.8s ease-out 1s both;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline;
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    font-weight: 500;
    margin-top: 4px;
}

/* Hero Visual - Code Window */
.hero-visual {
    flex: 1;
    max-width: 480px;
    animation: fadeInRight 1s ease-out 0.5s both;
}

.code-window {
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(139, 92, 246, 0.1);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.code-window:hover {
    transform: translateY(-5px) rotate(0.5deg);
    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.5),
        0 0 60px rgba(139, 92, 246, 0.15);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-glass);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dot.red {
    background: #ff5f57;
}

.code-dot.yellow {
    background: #febc2e;
}

.code-dot.green {
    background: #28c840;
}

.code-filename {
    margin-left: auto;
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.code-body {
    padding: 24px;
    font-family: var(--font-code);
    font-size: 0.85rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-body code {
    font-family: inherit;
}

.code-keyword {
    color: #c678dd;
}

.code-variable {
    color: #e06c75;
}

.code-property {
    color: #e5c07b;
}

.code-string {
    color: #98c379;
}

.code-method {
    color: #61afef;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-tertiary);
    font-size: 0.8rem;
    animation: fadeInUp 1s ease-out 1.2s both;
}

.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--text-tertiary);
    border-radius: 12px;
    position: relative;
}

.mouse-wheel {
    width: 4px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }

    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

/* ========================================
   About Section
   ======================================== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    align-items: center;
}

.avatar-container {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 0 auto;
}

.avatar-ring {
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    border: 2px solid transparent;
    background: var(--gradient-primary) border-box;
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask-composite: xor;
    animation: rotate 6s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--gradient-glow);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.avatar-placeholder i {
    font-size: 5rem;
    color: var(--accent-violet);
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

.about-heading {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-text {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.8;
}

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

.about-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 28px 0 32px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.info-item:hover {
    border-color: rgba(6, 182, 212, 0.2);
    background: rgba(6, 182, 212, 0.05);
}

.info-item i {
    font-size: 1.2rem;
    color: var(--accent-cyan);
    width: 20px;
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.info-value {
    display: block;
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ========================================
   Skills Section
   ======================================== */
.skills-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 32px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-medium);
}

.skill-category:hover {
    background: var(--bg-card-hover);
    border-color: rgba(139, 92, 246, 0.2);
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.category-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: white;
}

.category-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-glass);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.skill-tag:hover {
    color: var(--accent-cyan);
    border-color: rgba(6, 182, 212, 0.3);
    background: rgba(6, 182, 212, 0.08);
    transform: translateY(-2px);
}

.skill-tag i {
    font-size: 1rem;
    color: var(--accent-cyan);
}

.skill-icon-img {
    width: 16px;
    height: 16px;
}

/* ========================================
   Projects Section
   ======================================== */
.project-filters {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 24px;
    border-radius: 50px;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.active {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all var(--transition-medium);
    transform: translateY(0);
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(139, 92, 246, 0.4);
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 30px rgba(139, 92, 246, 0.15);
}

.project-card.hidden {
    display: none;
}

.project-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.project-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-img {
    transform: scale(1.05);
}

.coming-soon {
    opacity: 0.6;
    border-style: dashed;
}

.coming-soon:hover {
    opacity: 0.8;
}

/* Carousel */
.carousel-container {
    position: relative;
}

.carousel-track {
    width: 100%;
    height: 100%;
    position: relative;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(10, 14, 26, 0.7);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    z-index: 3;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
}

.carousel-container:hover .carousel-btn {
    opacity: 1;
}

.carousel-btn:hover {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: white;
}

.carousel-prev {
    left: 10px;
}

.carousel-next {
    right: 10px;
}

.carousel-dots {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
    z-index: 3;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.carousel-dot.active {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    width: 20px;
    border-radius: 10px;
}

.carousel-dot:hover {
    background: rgba(255, 255, 255, 0.6);
}

.project-placeholder {
    width: 100%;
    height: 100%;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: rgba(255, 255, 255, 0.3);
    transition: transform var(--transition-slow);
}

.project-card:hover .project-placeholder {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 14, 26, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

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

.project-links {
    display: flex;
    gap: 16px;
}

.project-link {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    transform: translateY(20px);
}

.project-card:hover .project-link {
    transform: translateY(0);
}

.project-link:hover {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: white;
}

.project-info {
    padding: 24px;
}

.project-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.project-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

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

.tech-tag {
    padding: 4px 12px;
    background: rgba(6, 182, 212, 0.08);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 0.5px;
}

/* ========================================
   Experience / Timeline
   ======================================== */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom,
            transparent,
            var(--accent-cyan),
            var(--accent-violet),
            transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

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

.timeline-dot {
    position: absolute;
    left: -46px;
    top: 8px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    border: 3px solid var(--bg-primary);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
    z-index: 1;
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 28px;
    backdrop-filter: blur(10px);
    transition: all var(--transition-medium);
}

.timeline-content:hover {
    border-color: rgba(6, 182, 212, 0.2);
    transform: translateX(5px);
}

.timeline-date {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 12px;
}

.timeline-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.timeline-place {
    font-size: 0.95rem;
    color: var(--accent-violet);
    font-weight: 500;
    margin-bottom: 12px;
}

.timeline-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.contact-info>p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-glow);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--accent-cyan);
    flex-shrink: 0;
}

.contact-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.contact-item a,
.contact-item span {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.contact-item a:hover {
    color: var(--accent-cyan);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(6, 182, 212, 0.3);
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 36px;
    backdrop-filter: blur(10px);
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 0;
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--border-glass);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-fast);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-cyan);
}

.form-group label {
    position: absolute;
    left: 0;
    top: 16px;
    color: var(--text-tertiary);
    font-size: 1rem;
    pointer-events: none;
    transition: all var(--transition-fast);
}

.form-group input:focus+label,
.form-group input:not(:placeholder-shown)+label,
.form-group textarea:focus+label,
.form-group textarea:not(:placeholder-shown)+label {
    top: -8px;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.form-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-medium);
}

.form-group input:focus~.form-line,
.form-group textarea:focus~.form-line {
    width: 100%;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-glass);
    position: relative;
    z-index: 1;
}

.footer-content {
    text-align: center;
}

.footer-logo {
    font-family: var(--font-code);
    font-size: 1.3rem;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 12px;
}

.footer-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 4px;
}

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

.footer-copyright {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

/* ========================================
   Back to Top
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: 1.1rem;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-medium);
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.4);
}

/* ========================================
   Scroll Reveal Animation
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
   Keyframe Animations
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 140px;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        max-width: 420px;
    }

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

    .about-info-grid {
        justify-items: center;
    }

    .about-content .btn {
        margin: 0 auto;
    }

    .skills-categories {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 70px 0;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(30px);
        flex-direction: column;
        padding: 100px 40px;
        gap: 8px;
        transition: right var(--transition-medium);
        border-left: 1px solid var(--border-glass);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: block;
    }

    .nav-link {
        padding: 12px 18px;
        font-size: 1rem;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-surname {
        font-size: 1.2rem;
    }

    .hero-visual {
        max-width: 100%;
    }

    .code-body {
        font-size: 0.75rem;
        padding: 16px;
    }

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

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: 30px;
    }

    .timeline-dot {
        left: -36px;
    }

    .scroll-indicator {
        display: none;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-top: 120px;
    }

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        padding: 12px 28px;
        font-size: 0.9rem;
    }

    .project-filters {
        gap: 8px;
    }

    .filter-btn {
        padding: 8px 18px;
        font-size: 0.8rem;
    }

    .contact-form {
        padding: 24px;
    }
}

/* WhatsApp Button */
.btn-whatsapp {
    background: #25D366;
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(37, 211, 102, 0.3);
}

.btn-whatsapp:hover {
    background: #20bd5a;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(37, 211, 102, 0.4);
    color: white;
}

/* New Language Switcher */
.lang-switch {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    padding: 3px;
    border-radius: 30px;
    border: 1px solid var(--border-glass);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 12px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 20px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-btn.active {
    background: var(--accent-cyan);
    color: white;
    box-shadow: 0 2px 10px rgba(6, 182, 212, 0.3);
}

.lang-btn:hover:not(.active) {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

/* ========================================
   Certificates Section
   ======================================== */
.certificates {
    background: var(--bg-primary);
}

.cert-group {
    margin-bottom: 48px;
}

.cert-group-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-glass);
    display: flex;
    align-items: center;
    gap: 10px;
}

.cert-group-title i {
    color: var(--accent-cyan);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}

.cert-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 12px;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.cert-card:hover {
    border-color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.05);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(6, 182, 212, 0.15);
}

.cert-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--accent-cyan);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.cert-card:hover .cert-icon {
    background: rgba(6, 182, 212, 0.2);
}

.cert-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    overflow: hidden;
}

.cert-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cert-issuer {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Publication link button */
.cert-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    border-radius: 50px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.3);
    color: var(--accent-cyan);
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.cert-link-btn:hover {
    background: rgba(6, 182, 212, 0.2);
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .cert-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   PDF Preview Modal
   ======================================== */
.pdf-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.pdf-modal.active {
    opacity: 1;
    pointer-events: all;
}

.pdf-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(6px);
}

.pdf-modal-container {
    position: relative;
    z-index: 1;
    width: 90%;
    max-width: 900px;
    height: 88vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: 16px;
    overflow: hidden;
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s ease;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
}

.pdf-modal.active .pdf-modal-container {
    transform: scale(1) translateY(0);
}

.pdf-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border-glass);
    flex-shrink: 0;
}

.pdf-modal-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.pdf-modal-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pdf-modal-open,
.pdf-modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.85rem;
    text-decoration: none;
}

.pdf-modal-open:hover {
    background: rgba(6, 182, 212, 0.1);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.pdf-modal-close:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.5);
    color: #ef4444;
}

.pdf-modal-frame {
    flex: 1;
    width: 100%;
    border: none;
    background: #1e1e2e;
}

@media (max-width: 600px) {
    .pdf-modal-container {
        width: 100%;
        height: 100%;
        border-radius: 0;
        max-width: 100%;
    }
}