:root {
    --bg-color: #ffffff;
    --text-color: #333;
    --header-text-color: #2c3e50;
    --secondary-text-color: #6c757d;
    --border-color: #e9ecef;
    --accent-color: #007bff;
    --accent-color-hover: #0056b3;
    --card-bg-color: #f8f9fa;
    --project-accent-color: #28a745;
    --project-accent-hover: #218838;
    --blog-accent-color: #ffc107;
    --blog-accent-hover: #e0a800;
    --social-link-bg: #6c757d;
    --social-link-hover: #495057;
    --input-border-color: #ced4da;
    --input-focus-border: #007bff;
    --input-focus-shadow: rgba(0, 123, 255, 0.25);
    --button-bg: #007bff;
    --button-text: white;
    --button-hover-bg: #0056b3;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --header-text-color: #ffffff;
    --secondary-text-color: #a0a0a0;
    --border-color: #333333;
    --accent-color: #00aaff;
    --accent-color-hover: #0088cc;
    --card-bg-color: #1e1e1e;
    --project-accent-color: #33cc66;
    --project-accent-hover: #22aa55;
    --blog-accent-color: #ffdd44;
    --blog-accent-hover: #ffcc00;
    --social-link-bg: #444444;
    --social-link-hover: #555555;
    --input-border-color: #444;
    --input-focus-border: #00aaff;
    --input-focus-shadow: rgba(0, 170, 255, 0.25);
    --button-bg: #00aaff;
    --button-text: #121212;
    --button-hover-bg: #0088cc;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100%;
    padding: 40px;
    min-height: 100vh;
}

/* Header styles */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding: 20px 0;
    border-bottom: 2px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--header-text-color);
    margin: 0;
}

.theme-switcher {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 28px;
    display: flex;
    align-items: center;
}

.slider:before {
    position: absolute;
    content: "🌙";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
}

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

input:checked + .slider:before {
    content: "☀️";
    transform: translateX(22px);
}

/* Navigation styles */
.tab-navigation {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    flex-wrap: wrap;
    gap: 5px;
    margin: 0;
    border: none;
}

.tab-btn {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    color: var(--secondary-text-color);
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
    font-weight: 500;
}

.tab-btn:hover {
    color: var(--header-text-color);
    background-color: var(--card-bg-color);
}

.tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    background-color: var(--card-bg-color);
}

/* Content styles */
.content {
    padding: 20px 0;
    max-width: 1200px;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    font-size: 2rem;
    color: var(--header-text-color);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
}

h3 {
    font-size: 1.3rem;
    color: var(--header-text-color);
    margin-bottom: 15px;
    margin-top: 25px;
}

p {
    margin-bottom: 15px;
    color: var(--secondary-text-color);
    line-height: 1.7;
}

/* Home page styles */
.about-me {
    background-color: var(--card-bg-color);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    max-width: 800px;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-color-hover);
    text-decoration: underline;
}


/* Projects page styles */
.project-item {
    background-color: var(--card-bg-color);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid var(--project-accent-color);
    max-width: 800px;
}

.project-meta {
    color: var(--secondary-text-color);
    font-style: italic;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.project-links {
    margin-top: 15px;
}

.project-links a {
    display: inline-block;
    background-color: var(--project-accent-color);
    color: var(--button-text);
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 5px;
    margin-right: 10px;
    margin-top: 5px;
    font-size: 0.9rem;
    transition: background-color 0.3s ease;
}

.project-links a:hover {
    background-color: var(--project-accent-hover);
    text-decoration: none;
}

/* Blog page styles */
.blog-post {
    background-color: var(--card-bg-color);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid var(--blog-accent-color);
    max-width: 800px;
}

.blog-meta {
    color: var(--secondary-text-color);
    font-style: italic;
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.read-more {
    color: var(--blog-accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: var(--blog-accent-hover);
    text-decoration: underline;
}

.blog-note {
    text-align: left;
    font-style: italic;
    color: var(--secondary-text-color);
    margin-top: 30px;
}

/* Contact page styles */
.social-list {
    list-style: none;
    padding-left: 0;
    margin-top: 15px;
}

.social-list li {
    margin: 10px 0;
    padding: 5px 0;
}

.social-list a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.social-list a:hover {
    color: var(--accent-color-hover);
    text-decoration: underline;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }

    .header-controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .tab-navigation {
        justify-content: flex-start;
        width: auto;
    }
    
    .tab-btn {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .project-item,
    .blog-post {
        padding: 15px;
    }
}