/* === VARIABLES === */
:root {
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a2e;
    --color-accent: #3498db;
    --color-accent-hover: #2980b9;
    --color-text-primary: #e8e8f0;
    --color-text-secondary: #a8a8b8;
    --color-text-muted: #707080;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-glow: rgba(52, 152, 219, 0.15);
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 100%);
    background-attachment: fixed;
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(52, 152, 219, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(52, 152, 219, 0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* === NAVIGATION === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition);
}

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text-primary);
    transition: var(--transition);
}

/* === CONTAINER === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* === SECTION TITLE === */
.section-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* === BUTTONS === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.1rem;
}

.btn span {
    position: relative;
    z-index: 1;
}

/* === HERO SECTION === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    position: relative;
}

.hero-container {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    align-items: center;
}

.hero-image-wrapper {
    display: flex;
    justify-content: center;
    animation: fadeInLeft 1s ease-out;
}

.hero-image {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
    box-shadow: 
        0 0 0 1px rgba(52, 152, 219, 0.1),
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 100px rgba(52, 152, 219, 0.15);
    transition: var(--transition);
}

.hero-image:hover {
    transform: scale(1.05);
    box-shadow: 
        0 0 0 1px rgba(52, 152, 219, 0.3),
        0 25px 80px rgba(0, 0, 0, 0.6),
        0 0 120px rgba(52, 152, 219, 0.25);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-text {
    animation: fadeInRight 1s ease-out;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.75rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.mouse {
    width: 30px;
    height: 50px;
    border: 2px solid var(--color-accent);
    border-radius: 20px;
    position: relative;
}

.mouse::before {
    content: '';
    width: 4px;
    height: 10px;
    background: var(--color-accent);
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
    animation: scroll 1.5s infinite;
}

/* === ABOUT SECTION === */
.about {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.about-content {
    max-width: 900px;
}

.about-text {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: 1.5rem;
}

.about-facts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.fact-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1rem;
    text-align: center;
    transition: var(--transition);
}

.fact-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.1);
}

.fact-number {
    font-size: 2.0rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.fact-label {
    font-size: 1rem;
    color: var(--color-text-secondary);
}

/* === EXPERIENCE SECTION === */
.experience {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-accent) 0%, rgba(52, 152, 219, 0.1) 100%);
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    animation: fadeInUp 0.6s ease-out;
}

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

.timeline-marker {
    position: absolute;
    left: -3.5rem;
    top: 0.5rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 3px solid var(--color-bg-primary);
    box-shadow: 0 0 20px rgba(52, 152, 219, 0.5);
    z-index: 2;
}

.timeline-content {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
}

.timeline-content:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent);
    transform: translateX(10px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 2rem;
}

.timeline-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: 0.25rem;
}

.timeline-company {
    font-size: 1.1rem;
    color: var(--color-accent);
    font-weight: 600;
}

.timeline-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
    white-space: nowrap;
}

.timeline-date {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    font-weight: 600;
}

.timeline-location {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.timeline-description {
    list-style: none;
    padding: 0;
}

.timeline-description li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.timeline-description li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

/* === SKILLS SECTION === */
.skills {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.skills-core {
    margin-bottom: 4rem;
}

.skills-category-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--color-text-primary);
}

.skills-core-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.skill-core-card {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(52, 152, 219, 0.05) 100%);
    border: 1px solid var(--color-accent);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-accent);
    transition: var(--transition);
    cursor: default;
}

.skill-core-card:hover {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.2) 0%, rgba(52, 152, 219, 0.1) 100%);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.2);
}

.skills-categories {
    display: grid;
    gap: 3rem;
}

.skills-category {
    animation: fadeInUp 0.6s ease-out;
}

.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.skill-badge {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    transition: var(--transition);
    cursor: default;
}

.skill-badge:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.15);
}

/* === PROJECTS SECTION === */
.projects {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 2rem;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    animation: fadeInUp 0.6s ease-out;
}

.project-card:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent);
    transform: translateY(-10px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.3);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.project-title {
    font-size: 1.0rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1.3;
}

.project-role {
    background: rgba(52, 152, 219, 0.15);
    color: var(--color-accent);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
}

.project-description {
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

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

.tech-tag {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 0.4rem 0.9rem;
    border-radius: 6px;
    font-size: 0.85rem;
}

.project-expand {
    background: rgba(52, 152, 219, 0.1);
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.project-expand:hover {
    background: rgba(52, 152, 219, 0.2);
    transform: translateX(5px);
}

/* === CV CALLOUT SECTION === */
.cv-callout {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.cv-callout-content {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(52, 152, 219, 0.05) 100%);
    border: 1px solid var(--color-accent);
    border-radius: 16px;
    padding: 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cv-callout-content::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

.cv-callout-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.cv-callout-text {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    position: relative;
    z-index: 1;
}

/* === CONTACT SECTION === */
.contact {
    padding: var(--spacing-xl) 0;
    position: relative;
}

.contact-intro {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.contact-icon {
    color: var(--color-accent);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.contact-item h4 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    color: var(--color-text-primary);
}

.contact-item a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    color: var(--color-text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
}

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

/* === FOOTER === */
.footer {
    padding: 3rem 0;
    text-align: center;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
}

/* === ANIMATIONS === */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scroll {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(15px);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-text {
        order: 2;
    }
    
    .hero-image-wrapper {
        order: 1;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .timeline-header {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .timeline-meta {
        align-items: flex-start;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(10, 10, 15, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .hero {
        padding: 6rem 1.5rem 3rem;
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
    
    .hero-subtitle {
        font-size: 1.35rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-image {
        width: 280px;
        height: 280px;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }
    
    .container {
        padding: 0 1.5rem;
    }
    
    .about-facts {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .timeline {
        padding-left: 2rem;
    }
    
    .timeline-marker {
        left: -2.4rem;
    }
    
    .timeline-content {
        padding: 1.5rem;
    }
    
    .timeline-title {
        font-size: 1.25rem;
    }
    
    .skills-core-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .cv-callout-content {
        padding: 2.5rem 1.5rem;
    }
    
    .cv-callout-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.25rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .about-facts {
        grid-template-columns: 1fr;
    }
}