:root {
    --primary-color: #1DA1F2;
    --bg-color: #ffffff;
    --text-color: #000000;
    --border-color: #e0e0e0;
    --card-bg: #f5f8fa;
}

[data-theme="dark"] {
    --bg-color: #15202B;
    --text-color: #ffffff;
    --border-color: #38444d;
    --card-bg: #192734;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', sans-serif;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    z-index: 100;
}

.search-bar {
    padding: 0.8rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    width: 400px;
    background-color: var(--card-bg);
}

.container {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 2rem;
    padding: 2rem;
}

.sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.profile-card {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 15px;
    text-align: center;
}

.profile-pic {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.profile-pic-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 1rem;
}

.create-post {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 15px;
    margin-bottom: 2rem;
}

.create-post textarea {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    margin-bottom: 1rem;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.post-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    cursor: pointer;
    float: right;
}

.post {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 15px;
    margin-bottom: 1rem;
}

.post-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.post-content {
    margin-bottom: 1rem;
}

.post-actions {
    display: flex;
    gap: 2rem;
}

.theme-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    margin-right: 1rem;
}

@media (max-width: 1200px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        display: none;
    }
}