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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.header h1 {
    color: #667eea;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.user-selector {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 15px;
}

.user-btn {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.user-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.user-btn.active {
    background: linear-gradient(45deg, #764ba2, #667eea);
    transform: scale(1.05);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
}

.sidebar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 20px;
    height: fit-content;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.profile-card {
    text-align: center;
    margin-bottom: 20px;
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    font-weight: bold;
    margin: 0 auto 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.profile-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: #333;
}

.profile-stats {
    display: flex;
    justify-content: space-around;
    margin: 15px 0;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 1.2rem;
    font-weight: bold;
    color: #667eea;
}

.stat-label {
    font-size: 0.8rem;
    color: #666;
}

.follow-btn {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    width: 100%;
    margin-top: 10px;
    transition: all 0.3s ease;
}

.follow-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.follow-btn.following {
    background: #28a745;
}

.feed {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.create-post {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border: 2px solid rgba(102, 126, 234, 0.2);
}

.create-post textarea {
    width: 100%;
    border: none;
    outline: none;
    resize: none;
    font-size: 1rem;
    font-family: inherit;
    background: transparent;
    min-height: 80px;
    padding: 10px;
}

.create-post textarea::placeholder {
    color: #999;
}

.post-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
}

.post-btn {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.post-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.post-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.post {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.post:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.post-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.post-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    margin-right: 10px;
}

.post-info {
    flex: 1;
}

.post-author {
    font-weight: 600;
    margin-bottom: 2px;
}

.post-time {
    font-size: 0.8rem;
    color: #666;
}

.post-content {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 15px;
    color: #333;
}

.post-interactions {
    display: flex;
    gap: 20px;
    align-items: center;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding-top: 15px;
}

.interaction-btn {
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 20px;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.interaction-btn:hover {
    background: rgba(102, 126, 234, 0.1);
}

.interaction-btn.liked {
    color: #e74c3c;
}

.comments-section {
    margin-top: 15px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding-top: 15px;
}

.comment {
    background: rgba(255, 255, 255, 0.7);
    border-radius: 10px;
    padding: 12px;
    margin-bottom: 10px;
    border-left: 3px solid #667eea;
}

.comment-author {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 5px;
    color: #667eea;
}

.comment-text {
    font-size: 0.9rem;
    line-height: 1.4;
}

.comment-input {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.comment-input input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 20px;
    outline: none;
    font-size: 0.9rem;
}

.comment-input input:focus {
    border-color: #667eea;
}

.comment-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.comment-btn:hover {
    background: #5a67d8;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    .header h1 {
        font-size: 2rem;
    }
    .user-selector {
        gap: 5px;
    }
    .user-btn {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pulse {
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}