:root {
    --bg-dark: #0f172a;
    --bg-darker: #0b1120;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --accent: #7dd3fc;
    --accent-dark: #0ea5e9;
    --card-bg: #1e293b;
    --card-hover: #334155;
    --transition: all 0.3s ease;
    --success: #86efac;
    --warning: #fde047;
    --danger: #f87171;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

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

section {
    padding: 100px 0;
    position: relative;
}

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    backdrop-filter: blur(10px);
    background: rgba(15, 23, 42, 0.9);
    border-bottom: 1px solid rgba(100, 116, 139, 0.2);
    transition: var(--transition);
}

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

.logo, .footer-logo {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--accent);
    text-decoration: none;
}

.logo {
    display: flex;
    align-items: center;
}

.logo span, .footer-logo span {
    color: var(--text-primary);
}

.logo i, .footer-logo i {
    margin-right: 10px;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 30px;
}

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

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

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

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(125, 211, 252, 0.05) 0%, rgba(15, 23, 42, 0) 70%);
    z-index: -1;
}

.hero-content {
    max-width: 700px;
}

.hero-subtitle {
    color: var(--accent);
    font-size: 1.2rem;
    margin-bottom: 15px;
    font-family: 'JetBrains Mono', monospace;
    animation: fadeInUp 1s ease forwards;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 20px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease forwards;
}

.hero-title span {
    color: var(--accent);
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 0.3s forwards;
}

.hero-btns {
    display: flex;
    gap: 20px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease 0.6s forwards;
}

.btn {
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-family: 'JetBrains Mono', monospace;
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-dark);
}

.btn-primary:hover {
    background: transparent;
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(125, 211, 252, 0.2);
}

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

.btn-secondary:hover {
    background: var(--accent);
    color: var(--bg-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(125, 211, 252, 0.2);
}

/* About Section - Flip Card */
.about {
    background: var(--bg-darker);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--accent);
    border-radius: 2px;
}

.section-subtitle {
    color: var(--text-secondary);
    margin-bottom: 60px;
    max-width: 600px;
}

.about-content {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 600px;
}

.flip-card {
    width: 700px;
    height: 500px;
    perspective: 2000px;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
    cursor: pointer;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-radius: 20px;
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px;
    overflow: hidden;
}

.flip-card-front {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border: 1px solid rgba(125, 211, 252, 0.2);
}

.flip-card-back {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    transform: rotateY(180deg);
    border: 1px solid rgba(125, 211, 252, 0.2);
    text-align: center;
    overflow-y: auto;
}

.profile-photo {
    min-width: 150px;
    min-height: 150px;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, #2d3748, #4a5568);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
    border: 5px solid var(--accent);
    box-shadow: 0 10px 30px rgba(125, 211, 252, 0.2);
    overflow: hidden;
}

.profile-photo img {
    user-select: none;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.flip-card-front h3 {
    user-select: none;
    font-size: 2.2rem;
    margin-bottom: 15px;
    color: var(--accent);
}

.flip-card-front p {
    user-select: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1.3rem;
    margin-bottom: 30px;
}

.flip-card-back p {
    color: var(--text-primary);
    user-select: none;
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.7;
    text-align: left;
}

.flip-indicator {
    position: flex;
    right: 50%;
    color: var(--accent);
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    background: rgba(125, 211, 252, 0.1);
    padding: 8px 15px;
    border-radius: 20px;
}



.skill-category {
    margin-bottom: 40px;
}

.skill-category h3 {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-category h3 i {
    font-size: 1.2rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(4, 2fr);
    gap: 20px;
}

.skill-item {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    transition: var(--transition);
    border: 1px solid rgba(100, 116, 139, 0.2);
    position: relative;
    overflow: hidden;
}

.skill-item:hover {
    background: var(--card-hover);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(125, 211, 252, 0.3);
}

.skill-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    opacity: 0;
    transition: var(--transition);
}

.skill-item:hover::before {
    opacity: 1;
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
}

.skill-icon {
    width: 50px;
    height: 50px;
    background: rgba(125, 211, 252, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--accent);
}

.skill-name {
    font-size: 1.1rem;
    font-weight: 600;
}

.skill-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Projects Section */
.projects {
    background: var(--bg-darker);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(100, 116, 139, 0.2);
    position: relative;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(125, 211, 252, 0.3);
}

.project-image {
    height: 200px;
    background: linear-gradient(135deg, #475569, #1e293b);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: 4rem;
}

.project-content {
    padding: 25px;
}

.project-tags {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.project-tag {
    padding: 5px 12px;
    border-radius: 30px;
    background: rgba(125, 211, 252, 0.1);
    color: var(--accent);
    font-size: 0.8rem;
    font-family: 'JetBrains Mono', monospace;
}

.project-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.project-links {
    display: flex;
    gap: 15px;
}

.project-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--accent-dark);
}

.project-link i {
    font-size: 0.9rem;
}

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

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 100%;
    background: var(--card-bg);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    width: calc(50% - 50px);
}

.timeline-item:nth-child(odd) {
    left: 0;
}

.timeline-item:nth-child(even) {
    left: calc(50% + 50px);
}

.timeline-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    transition: var(--transition);
    border: 1px solid rgba(100, 116, 139, 0.2);
}

.timeline-content:hover {
    background: var(--card-hover);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(125, 211, 252, 0.3);
}

.timeline-date {
    background: var(--accent);
    color: var(--bg-dark);
    padding: 5px 15px;
    border-radius: 30px;
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    margin-bottom: 15px;
}

.timeline-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

.timeline-company {
    color: var(--accent);
    font-size: 1.1rem;
    margin-bottom: 15px;
    display: block;
}

.timeline-description {
    color: var(--text-secondary);
}

.timeline-item::before {
    content: '';
    position: absolute;
    top: 20px;
    width: 20px;
    height: 20px;
    background: var(--accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-item:nth-child(odd)::before {
    right: -60px;
}

.timeline-item:nth-child(even)::before {
    left: -60px;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: rgba(125, 211, 252, 0.1);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--accent);
    flex-shrink: 0;
}

.contact-text h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.contact-text p, .contact-text a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    display: block;
    margin-bottom: 5px;
}

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

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-link {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--card-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-primary);
    transition: var(--transition);
    text-decoration: none;
}

.social-link:hover {
    background: var(--accent);
    color: var(--bg-dark);
    transform: translateY(-5px);
}

/* Footer */
footer {
    background: var(--bg-darker);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(100, 116, 139, 0.2);
}

.copyright {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 20px;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

.snowflake {
    position: fixed;
    top: -2em;
    font-size: .1em;
    pointer-events: none;
    user-select: none;
    z-index: 9999;
    animation-name: fall;
    animation-timing-function: linear;
}

@keyframes fall {
    0% { top: -2em; opacity: 1; }
    90% { opacity: .1; }
    100% { top: 100vh; opacity: 0; }
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .about-content,
    .skills-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
    }
    
    .timeline-item:nth-child(even) {
        left: 0;
    }
    
    .timeline-item:nth-child(odd)::before,
    .timeline-item:nth-child(even)::before {
        left: 20px;
    }
    
    .flip-card {
        width: 400px;
        height: 560px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-btns {
        flex-direction: column;
        gap: 15px;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .flip-card {
        width: 350px;
        height: 490px;
    }
    
    .profile-photo {
        width: 170px;
        height: 170px;
    }
}

@media (max-width: 480px) {
    .profile-photo {
        width: 150px;
        height: 150px;
    }

    .flip-card {
        width: 300px;
        height: 420px;
    }
    
    .flip-card-front h3 {
        font-size: 1.8rem;
    }
    
    .flip-card-front p {
        font-size: 1.1rem;
    }

    .flip-indicator {
        display: none;
    }
    .flip-card-back p {
        margin: 0;
        font-size: .9em;
    }
}