:root {
    --bg-color-light: #ffffff;
    --text-color-light: #333333;
    --card-bg-light: #ffffff;
    --border-color-light: #e1e4e8;
    --primary-color-light: #0073e6;
    --secondary-color-light: #f5f5f5;
    --hover-color-light: #f0f0f0;
    --tag-bg-light: #e3e3e3;
    --tag-text-light: #555;

    --bg-color-dark: #0d1117;
    --text-color-dark: #f0f0f0;
    --card-bg-dark: #161b22;
    --border-color-dark: #30363d;
    --primary-color-dark: #58a6ff;
    --secondary-color-dark: #21262d;
    --hover-color-dark: #2c333a;
    --tag-bg-dark: #2d333b;
    --tag-text-dark: #9ca3af;
    
    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --card-bg: var(--card-bg-dark);
    --border-color: var(--border-color-dark);
    --primary-color: var(--primary-color-dark);
    --secondary-color: var(--secondary-color-dark);
    --hover-color: var(--hover-color-dark);
    --tag-bg: var(--tag-bg-dark);
    --tag-text: var(--tag-text-dark);
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

body.light-mode {
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --card-bg: var(--card-bg-light);
    --border-color: var(--border-color-light);
    --primary-color: var(--primary-color-light);
    --secondary-color: var(--secondary-color-light);
    --hover-color: var(--hover-color-light);
    --tag-bg: var(--tag-bg-light);
    --tag-text: var(--tag-text-light);
}

.main_container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: auto;
    gap: var(--spacing-md);
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* Heading Styles */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

h2 i {
    margin-right: var(--spacing-sm);
    color: var(--primary-color);
}

h3 {
    font-size: 1.2rem;
}

.profile {
    grid-column: span 12;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    position: relative;
}

.profile-image img {
    width: 180px;
    height: 180px;
    border-radius: 15px;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.profile-info {
    margin-left: var(--spacing-xl);
    flex-grow: 1;
}

.profile .title {
    margin-bottom: var(--spacing-xs);
    font-size: 1.2rem;
    color: var(--primary-color);
}

.profile .location {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    opacity: 0.8;
}

.profile .location i {
    margin-right: var(--spacing-xs);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background-color: var(--secondary-color);
    color: var(--text-color);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}

.social-link:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.theme-switch {
    position: absolute;
    right: 0;
    top: var(--spacing-xl);
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--secondary-color);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(30px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, transform 0.3s;
}

.btn i {
    margin-right: var(--spacing-sm);
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

.btn.secondary {
    background-color: var(--secondary-color);
    color: var(--text-color);
}

.btn.text {
    background-color: transparent;
    color: var(--primary-color);
    padding: 0;
}

.btn:hover {
    transform: translateY(-2px);
}

.about {
    grid-column: span 12;
}

.recent-projects {
    grid-column: span 12;
}

.education {
    grid-column: span 6;
}

.tech-stack {
    grid-column: span 6;
}

.reference {
    grid-column: span 12;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.project {
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: transform 0.3s, box-shadow 0.3s;
}

.project:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.project ul {
    margin-top: var(--spacing-sm);
    padding-left: var(--spacing-md);
}

.project li {
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.9;
}

.education-item {
    position: relative;
    padding-bottom: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.education-item:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
}

.education-item .year {
    display: block;
    margin: var(--spacing-xs) 0;
    color: var(--text-color);
    opacity: 0.8;
}

.education-item .location {
    display: flex;
    align-items: center;
    margin-top: var(--spacing-xs);
    color: var(--text-color);
    opacity: 0.8;
}

.education-item .location i {
    margin-right: var(--spacing-xs);
}

/* Tech Stack */
.stack-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.stack-group h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    opacity: 0.8;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.tag {
    background-color: var(--tag-bg);
    color: var(--tag-text);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: background-color 0.3s;
}

.tag:hover {
    background-color: var(--hover-color);
}

.reference-item {
    padding: var(--spacing-md) 0;
}

.reference-item p {
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
    opacity: 0.8;
}

.reference-item i {
    margin-right: var(--spacing-xs);
    width: 16px;
    text-align: center;
}

footer {
    grid-column: span 12;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-color);
    opacity: 0.8;
}

.chat-bubble {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
}

.chat-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.chat-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

@media (max-width: 1200px) {
    .about, .recent-projects, .education, 
    .tech-stack, .reference {
        grid-column: span 12;
    }
}

@media (max-width: 900px) {
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .profile {
        flex-direction: column;
        text-align: center;
    }

    .location {
        flex-direction: column;
        text-align: center;
    }
    
    .profile-info {
        margin-left: 0;
        margin-top: var(--spacing-md);
    }
    
    .social-links {
        justify-content: center;
    }
    
    .theme-switch {
        position: relative;
        margin-top: var(--spacing-md);
        right: auto;
        top: auto;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .main_container {
        padding: var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-md);
    }
}