/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #151a2e;
    --bg-tertiary: #1f2740;
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3c1;
    --accent-primary: #8b5cf6;
    --accent-secondary: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #a78bfa 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition);
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: 60px;
    text-align: center;
    position: relative;
    color: var(--text-primary);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 15px 0;
    box-shadow: var(--shadow-md);
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

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

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

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

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(167, 139, 250, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.greeting {
    display: block;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.name {
    display: block;
    font-size: 4rem;
    font-weight: bold;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    animation: fadeInUp 1s ease-out;
}

.hero-subtitle {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 40px;
    animation: fadeInUp 1s ease-out 0.6s both;
}

.btn {
    padding: 12px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
}

.social-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    animation: fadeInUp 1s ease-out 0.8s both;
}

.social-link {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

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

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background-color: var(--text-secondary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

/* ========================================
   About Section
   ======================================== */
.about {
    background-color: var(--bg-secondary);
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

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

.about-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.info-item {
    background-color: var(--bg-tertiary);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--accent-primary);
    transition: var(--transition);
}

.info-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.info-label {
    display: block;
    font-weight: 600;
    color: var(--accent-secondary);
    margin-bottom: 5px;
}

.info-value {
    color: var(--text-secondary);
}

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

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

.timeline-item {
    position: relative;
    padding-left: 50px;
    margin-bottom: 50px;
}

.timeline-dot {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-gradient);
    box-shadow: 0 0 0 4px var(--bg-primary);
}

.timeline-content {
    background-color: var(--bg-tertiary);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.timeline-header h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.company {
    display: inline-block;
    color: var(--accent-secondary);
    font-weight: 600;
    margin-right: 15px;
}

.duration {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.timeline-list {
    list-style: none;
    margin-top: 20px;
}

.timeline-list li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.timeline-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 1.2rem;
}

/* ========================================
   Skills Section
   ======================================== */
.skills {
    background-color: var(--bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.skill-category {
    background-color: var(--bg-tertiary);
    padding: 30px;
    border-radius: 10px;
    transition: var(--transition);
    border-top: 3px solid var(--accent-primary);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.category-title {
    font-size: 1.3rem;
    color: var(--accent-secondary);
    margin-bottom: 20px;
}

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

.skill-tag {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: var(--transition);
    border: 1px solid transparent;
}

.skill-tag:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   Projects Section
   ======================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    background-color: var(--bg-tertiary);
    border-radius: 10px;
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background-color: var(--bg-secondary);
}

.contact-description {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 50px;
    line-height: 1.8;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-item {
    background-color: var(--bg-tertiary);
    padding: 10px;
    border-radius: 10px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: var(--transition);
    overflow: hidden;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--accent-primary);
}

.contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.contact-details h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.contact-details {
    overflow: hidden;
    min-width: 0;
    flex: 1;
}

.contact-details a,
.contact-details p {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.95rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--bg-primary);
    padding: 30px 0;
    text-align: center;
    color: var(--text-secondary);
    border-top: 1px solid var(--bg-tertiary);
}

/* ========================================
   Animations
   ======================================== */
@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(20px);
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
        padding: 20px 0;
        gap: 20px;
    }

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

    .name {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

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

    .section-title {
        font-size: 2rem;
    }

    .section {
        padding: 60px 0;
    }

    .timeline::before {
        left: 0;
    }

    .timeline-item {
        padding-left: 40px;
    }

    .skills-grid,
    .projects-grid,
    .contact-info,
    .about-info {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .name {
        font-size: 2rem;
    }

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

    .btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.8rem;
    }
}