:root {
    --bg: #f0f2f5;
    --card: #fff;
    --text: #111;
    --primary: #1877f2;
}

body.dark {
    --bg: #18191a;
    --card: #242526;
    --text: #e4e6eb;
}

body {
    margin: 0;
    font-family: sans-serif;
    background: var(--bg);
    color: var(--text);
    transition: 0.3s;
}

header {
    display: flex;
    justify-content: space-between;
    padding: 15px 20px;
    background: var(--card);
    position: sticky;
    top: 0;
}

.container {
    max-width: 600px;
    margin: auto;
    padding: 10px;
}

/* Card */
.card, .post {
    background: var(--card);
    padding: 15px;
    border-radius: 12px;
    margin: 10px 0;
    animation: fadeIn 0.4s ease;
}

/* Input */
input, textarea {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    border-radius: 8px;
    border: none;
}

/* Button */
button {
    padding: 8px 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
}

/* Post */
.post-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.comment-box {
    margin-top: 10px;
}

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

/* Responsive */
@media (max-width: 600px) {
    .container {
        padding: 5px;
    }
}