:root {
    --bg-primary: #36393f;
    --bg-secondary: #2f3136;
    --bg-tertiary: #202225;
    --text-primary: #ffffff;
    --text-secondary: #b9bbbe;
    --text-muted: #72767d;
    --border-color: #40444b;
    --brand-color: #7984f7;
    --brand-hover: #656ed0;
    --green: #3ba55d;
    --red: #ed4245;
    --yellow: #faa61a;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f2f3f5;
    --bg-tertiary: #e3e5e8;
    --text-primary: #2e3338;
    --text-secondary: #4e5058;
    --text-muted: #6a6f76;
    --border-color: #e3e5e8;
    --brand-color: #5865f2;
    --brand-hover: #4752c4;
}

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

body {
    font-family: 'Whitney', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: all 0.3s ease;
    overflow-x: hidden;
}

/* Subtle animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.animate-on-scroll {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.animate-delay-1 {
    animation-delay: 0.1s;
}

.animate-delay-2 {
    animation-delay: 0.2s;
}

.animate-delay-3 {
    animation-delay: 0.3s;
}

.animate-delay-4 {
    animation-delay: 0.4s;
}

.animate-delay-5 {
    animation-delay: 0.5s;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    animation: fadeIn 0.5s ease;
}

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

.logo {
    height: 40px;
    width: 40px;
    background-color: var(--brand-color);
    padding: 4px;
    border-radius: 50%;
    transition: all 0.3s ease;
    cursor: pointer;
}

.logo:hover {
    transform: scale(1.15);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem;
    display: flex;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--brand-color);
    transition: width 0.3s ease;
}

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

.nav-links a:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
    border-radius: 6px 6px 0 0;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.theme-toggle:hover {
    border-color: var(--brand-color);
    color: var(--brand-color);
    transform: rotate(20deg) scale(1.1);
    box-shadow: 0 4px 12px rgba(88, 101, 242, 0.2);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    text-align: center;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.hero img {
    height: 320px;
    border-radius: 50%;
}

.hero::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(88, 101, 242, 0.05) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
    top: -50%;
    left: -50%;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero .container img {
    margin: 40px 0;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    animation: fadeInUp 0.8s ease;
}

.hero .subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero .description {
    font-size: 1rem;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto 3rem auto;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    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, 0.1), transparent);
    transition: left 0.5s ease;
}

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

.btn-primary {
    background-color: var(--brand-color);
    color: white;
    box-shadow: 0 2px 8px rgba(88, 101, 242, 0.2);
}

.btn-primary:hover {
    background-color: var(--brand-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(88, 101, 242, 0.3);
}

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

.btn-secondary:hover {
    border-color: var(--brand-color);
    color: var(--brand-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(88, 101, 242, 0.15);
}

/* Sections */
.section {
    padding: 4rem 0;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 600;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
}

.about-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
}

.stat-item {
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.5rem 0;
    display: block;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    background-color: var(--bg-primary);
}

.stat-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--brand-color);
    transition: all 0.3s ease;
    line-height: 1;
}

.stat-item:hover .stat-title {
    transform: scale(1.1);
}

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

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.skill-category {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--brand-color), var(--green));
    transition: left 0.5s ease;
}

.skill-category:hover::before {
    left: 0;
}

.skill-category:hover {
    transform: translateY(-3px);
    border-color: var(--brand-color);
    box-shadow: 0 8px 20px rgba(88, 101, 242, 0.1);
}

.skill-category h3 {
    color: var(--brand-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.skill-category:hover h3 {
    font-size: 1.4rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.skill-tag:hover {
    background-color: var(--brand-color);
    color: white;
    transform: translateY(-2px);
}

.skill-tag[data-skill="java"]:hover {
    background: linear-gradient(135deg, #f89820 0%, #ed8b00 100%);
}

.skill-tag[data-skill="c"]:hover {
    background: linear-gradient(135deg, #5c6bc0 0%, #3f51b5 100%);
}

.skill-tag[data-skill="python"]:hover {
    background: linear-gradient(135deg, #3776ab 0%, #2c5282 100%);
}

.skill-tag[data-skill="javascript"]:hover {
    background: linear-gradient(135deg, #f7df1e 0%, #e6c200 100%);
    color: #000;
}

.skill-tag[data-skill="kotlin"]:hover {
    background: linear-gradient(135deg, #7f52ff 0%, #6b46c1 100%);
}

.skill-tag[data-skill="abap"]:hover {
    background: linear-gradient(135deg, #2e7cd6 0%, #1e5fb8 100%);
}

.skill-tag[data-skill="android-studio"]:hover {
    background: linear-gradient(135deg, #3ddc84 0%, #2e7d32 100%);
}

.skill-tag[data-skill="compose"]:hover {
    background: linear-gradient(135deg, #4285f4 0%, #1565c0 100%);
}

.skill-tag[data-skill="room"]:hover {
    background: linear-gradient(135deg, #ff5722 0%, #d84315 100%);
}

.skill-tag[data-skill="koin"]:hover {
    background: linear-gradient(135deg, #ff6f00 0%, #e65100 100%);
}

.skill-tag[data-skill="firebase"]:hover {
    background: linear-gradient(135deg, #ffca28 0%, #ff8f00 100%);
    color: #000;
}

.skill-tag[data-skill="data-structures"]:hover {
    background: linear-gradient(135deg, #9c27b0 0%, #6a1b9a 100%);
}

.skill-tag[data-skill="algorithms"]:hover {
    background: linear-gradient(135deg, #e91e63 0%, #ad1457 100%);
}

.skill-tag[data-skill="oop"]:hover {
    background: linear-gradient(135deg, #00bcd4 0%, #0097a7 100%);
}

.skill-tag[data-skill="database-design"]:hover {
    background: linear-gradient(135deg, #4caf50 0%, #2e7d32 100%);
}

.skill-tag[data-skill="git"]:hover {
    background: linear-gradient(135deg, #f05032 0%, #d63031 100%);
}

.skill-tag[data-skill="vscode"]:hover {
    background: linear-gradient(135deg, #007acc 0%, #005a9e 100%);
}

.skill-tag[data-skill="intellij"]:hover {
    background: linear-gradient(135deg, #000000 0%, #424242 100%);
}

.skill-tag[data-skill="eclipse"]:hover {
    background: linear-gradient(135deg, #2c2255 0%, #1a1a2e 100%);
}

.skill-tag[data-skill="mongodb"]:hover {
    background: linear-gradient(135deg, #47a248 0%, #2e7d32 100%);
}

.skill-tag[data-skill="sql"]:hover {
    background: linear-gradient(135deg, #5c6bc0 0%, #3f51b5 100%);
}

.skill-tag[data-skill="nosql"]:hover {
    background: linear-gradient(135deg, #26c6da 0%, #00acc1 100%);
}

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

.project-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--brand-color), var(--green));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--brand-color);
    box-shadow: 0 10px 30px rgba(88, 101, 242, 0.15);
}

.project-card h3 {
    color: var(--brand-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    transition: all 0.3s ease;
}

.project-card:hover h3 {
    font-size: 1.5rem;
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

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

.tech-tag {
    background-color: var(--green);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.tech-tag:hover {
    transform: scale(1.1);
    box-shadow: 0 2px 8px rgba(59, 165, 93, 0.3);
}

.project-links {
    display: flex;
    gap: 1rem;
}

/* Contact Section */
.contact-content {
    text-align: center;
    max-width: 1600px;
    margin: 0 auto;
}

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

.contact-item {
    background-color: var(--bg-secondary);
    padding: 2rem 0;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.contact-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--brand-color);
    transition: width 0.3s ease;
}

.contact-item:hover::after {
    width: 100%;
}

.contact-item:hover {
    transform: translateY(-3px);
    border-color: var(--brand-color);
    box-shadow: 0 8px 20px rgba(88, 101, 242, 0.1);
}

.contact-item svg {
    width: 48px;
    height: 48px;
    color: var(--brand-color);
    margin: 0 8px;
    transition: all 0.3s ease;
}

.contact-item:hover svg {
    transform: scale(1.4) translateY(-10px);
}

.contact-item h4 {
    color: var(--brand-color);
    line-height: 1;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
}

.contact-item:hover h4 {
    transform: scale(1.05);
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

/* Footer */
.footer {
    background-color: var(--bg-tertiary);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
    nav {
        justify-content: center;
    }

    .nav-links {
        gap: 0.5rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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

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

    .project-links {
        flex-direction: column;
    }

    .logo {
        display: none;
    }

    .hero .container {
        flex-direction: column;
    }

    ;

    .hero img {
        height: 200px;
    }
}