body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #f4f4f9;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.back-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    padding: 10px 20px;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.2);
    transition: all 0.2s;
    z-index: 1000;
}
.back-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.container {
    background: white;
    width: 500px;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* UTILITIES */
.hidden { display: none; }

.loader {
    text-align: center;
    font-size: 1.5rem;
    color: #666;
    padding: 50px;
}

.error {
    color: #e74c3c;
    text-align: center;
    padding: 20px;
    background: #fadbd8;
    border-radius: 8px;
    border: 1px solid #e74c3c;
}

/* PROFILE */
.profile-header {
    display: flex;
    align-items: center;
    gap: 20px;
}

.avatar {
    width: 60px;
    height: 60px;
    background: #3498db;
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
}

h1 { margin: 0; font-size: 1.5rem; }
p { margin: 5px 0; color: #555; }

/* POSTS */
.post {
    background: #f9f9f9;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.post h3 { margin-top: 0; font-size: 1.1rem; }